Fuzzy Sliding Mode Control for Photovoltaic System


In this study, a fuzzy sliding mode control (FSMC) based maximum power point tracking strategy has been applied for photovoltaic (PV) system. The key idea of the proposed technique is to combine the performances of the fuzzy logic and the sliding mode control in order to improve the generated power for a given set of climatic conditions.

Different from traditional sliding mode control, the developed FSMC integrates two parts. The first part uses a fuzzy logic controller with two inputs and 25 rules as an equivalent controller while the second part is designed for an online adjusting of the switching controller’s gain using a fuzzy tuner with one input and one output.

Simulation results showed the effectiveness of the proposed approach achieving maximum power point. The fuzzy sliding mode (FSM) controller takes less time to track the maximum power point, reduced the oscillation around the operating point and also removed the chattering phenomena that could lead to decrease the efficiency of the photovoltaic system.


  1. DC-DC converter
  2. Fuzzy sliding mode control
  3. photovoltaic system
  4. MPPT
  5. Solar energy



In this paper, a fuzzy sliding mode controller based MPPT technique was developed and tested. The proposed controller is designed by combining the fuzzy logic and sliding mode control to guarantee the stability and the tracking performance and also to avoid the drawbacks of the traditional SM and FL controllers.

A Matlab/Simulink based simulation of a stand-alone PV system under varying climatic conditions and two levels of load was carried out to validate the proposed controller.

Simulation results demonstrate that the designed FSMC-MPPT exhibits good responses as it successfully and accurately achieved the maximum power point with a significantly higher performance than the P&O, SM and FLC strategies. The proposed approach provides a feasible approach to control PV power systems.


[1] Dounis, A.I., Kofinas, P., Alafodimos, C., &Tseles, D. (2013). Adaptive fuzzy gain scheduling PID controller for maximum power point tracking of photovoltaic system. Renewable energy, 60, 202-214.

[2] Bhatnagar, P., & Nema, R.K. (2013). Maximum power point tracking control techniques: State-of-the-art in photovoltaic applications. Renewable and Sustainable Energy Reviews, 23, 224-241.

[3] Farhat, M., Barambones, O., & Sbita, L. (2015). Efficiency optimization of a DSP-based standalone PV system using a stable single input fuzzy logic controller. Renewable and Sustainable Energy Reviews, 49, 907-920.

[4] Kalashani, Mostafa Barzegar et Farsadi, Murtaza. New Structure for Photovoltaic Systems with Maximum Power Point Tracking Ability. International Journal of Power Electronics and Drive Systems, 2014, vol. 4, no 4, p. 489.

[5] Liu, F., Kang, Y., Zhang, Y., & Duan, S. (2008, June). Comparison of P&O and hill climbing MPPT methods for grid-connected PV converter. In Industrial Electronics and Applications, 2008. ICIEA 2008. 3rd IEEE Conference on (pp. 804-807). IEEE.

Fuzzy Logic Based MPPT Control for a PV/Wind Hybrid Energy System


In this paper, we present a modeling and simulation of a standalone hybrid energy system which combines two renewable energy sources, solar and wind, with an intelligent MPPT control based on fuzzy logic to extract the maximum energy produced by the two PV and Wind systems. Moreover, other classical MPPT methods were simulated and evaluated to compare with the FLC method in order to deduce the most efficient in terms of rapidity and oscillations around the  maximum power point, namely Perturb and Observe (P&O),  Incremental Conductance (INC) for the PV system and Hill  Climbing Search (HCS) for the Wind generator. The simulation results show that the fuzzy logic technique has a better performance and more efficient compared to other methods due to its fast response, the good energy efficiency of the PV/Wind system and low oscillations during different weather conditions.


  1. Hybrid energy system
  2. MPPT
  3. Fuzzy Logic Control (FLC)
  4. Wind system
  5. Photovoltaic system
  6. PMSG



In this work, an intelligent control based on fuzzy logic is developed to improve the performance and reliability of a PV/Wind hybrid energy system, also the implementation of the other conventional MPPT algorithms for compared with the FLC technique. For a best performance analysis of MPPT techniques on the system, the simulations are carried out under different operating conditions. Simulation results show that the fuzzy controller has a better performance because it allows with a fast response and high accuracy to achieve and track the maximum power point than the P&O, INC and HCS methods for the PV and Wind generators respectively.


[1] A.V. Pavan Kumar, A.M. Parimi and K. Uma Rao, “Implementation of MPPT control using fuzzy logic in solar-wind hybrid power system,” IEEE International Conference on Signal Processing, Informatics, Communication and Energy Systems (SPICES), India, 19-21 February, 2015.

[2] C. Marisarla and K.R. Kumar, “A hybrid wind and solar energy system with battery energy storage for an isolated system,” International Journal of Engineering and Innovative Technology, vol. 3, n°3, pp. 99-104, ISSN 2277-3754, September 2013.

[3] L. Qin and X. Lu, “Matlab/Simulink-based research on maximum power point tracking of photovoltaic generation,” Physics Procedia, 24, pp.10- 18, 2012.

[4] B. Bendib, F. Krim, H. Belmili, M. F. Almi and S. Boulouma, “Advanced fuzzy MPPT controller for a stand-alone PV system,” Energy Procedia, 50, pp.383-392, 2014.

[5] H. Bounechba, A. Bouzid, K. Nabti and H. Benalla, “Comparison of perturb & observe and fuzzy logic in maximum power point tracker for pv systems,” Energy Procedia, 50, pp.677-684, 2014.

A Hybrid PV-Wind-Diesel System for Optimal Performance in Microgrid


The PV-Hydro Diesel technology can be made attractive option because the features various merits like as low maintenance requirement, environmental friendliness and absence of fuel cost. The efficiency of energy conversion a PV generation system may low because sun power cell exhibits to the nonlinear voltage and current and power versus voltage characteristics.


The recent advancements in the technology and the reduction of fossil fuel resources have further contributed to the cause. But still, there lies several challenges to it. The paper proposes a novel approach of hybridization of renewable sources using Maximum Peak Power Transfer technique and optimal control. The performance of our approach is quite better than its other counterparts in terms of transient state and the magnitude of voltage obtained.


  1. MPPT
  2. PV- Hydro – Diesel
  3. Perturb and observe




Fig. 1: Representing the overall proposed model


Fig. 2 Representing The FFT analysis of the voltage waveform at the load end. when the FFT analysis of the wave form is done the THD value is found to be 0.17 %.

Fig.3: The THD of the output


This paper proposed a novel approach of utilising a New Hybrid Technique approach to solve the MPPT problem in microgrid consisting of PV-Hydro Diesel cell connected to a grid using three phase inverter. The solar cell model was designed and given to boost converter. The converter output was analysed. An incremental conductance technique was also implemented for comparison purpose. The result of hybrid model was found to be quite better than the incremental conductance technique in terms of output voltage magnitude and THD content.


The THD content reduces using our proposed approach. Also when the current is compared, the oscillations die out very fast in case of hybrid model while in I&C approach it is more or less sustained. In future this algorithm can be improved using other techniques and approaches. Also real time implementation of the algorithms can be done and hardware testing can be done. Hybrid with other algorithms can be utilised and the performances can be compared. Also clustering and other gradient learning methods can be utilised and the model can be tested for grid connection.


[1] Reddy, K. Pavankumar, and M. Venu Gopala Rao. “Modelling and Simulation of Hybrid Wind Solar Energy System using MPPT.” Indian Journal of Science and Technology 8, no. 23 (2015).

[2] Dalala, Zakariya M., Zaka Ullah Zahid, Wensong Yu, Younghoon Cho, and Jih-Sheng Lai. “Design and analysis of an MPPT technique for small-scale wind energy conversion systems.” Energy Conversion, IEEE Transactions on 28, no. 3 (2013): 756-767.

[3] Jain, S., Agarwal, V., 2004. A new algorithm for rapid tracking of approximate maximum power point in PV-Hydro systems. IEEE Trans. Power Electron. 2, 16–19.

[4] Bhandari, Binayak, Shiva Raj Poudel, Kyung-Tae Lee, and Sung-Hoon Ahn. “Mathematical modeling of hybrid renewable energy system: A review on small hydro-solar-wind power generation.” international journal of precision engineering and manufacturing-green technology 1, no. 2 (2014): 157-173.

[5] S. Yuvarajan and JulineShoeb, “A Fast and Accurate Maximum Power Point Tracker for PV Systems,” IEEE, 2008.

Solar Photovoltaic Array Fed Luo Converter Based BLDC Motor Driven Water Pumping System


This paper deals with the solar photovoltaic (SPV) array fed water- pumping system using a Luo converter as an intermediate DC-DC converter and a permanent magnet brushless DC (BLDC) motor to drive a centrifugal water pump. Among the different types of DC-DC converters, an elementary Luo converter is selected in order to extract the maximum power available from the SPV array and for safe starting of BLDC motor. The elementary Luo converter with reduced components and single semiconductor switch has basic features of reducing the ripples in its output current and possessing a unlimited region for maximum power point tracking (MPPT).

bldc motor

The electronically changed BLDC motor is used with a voltage source inverter (VSI) operated at fundamental frequency switching so avoiding the high frequency switching losses resulting in a high efficiency of the system. The SPV array is designed such that the power at rated DC voltage is supplied to the BLDC motor-pump under standard test condition and maximum switch utilization of Luo converter is obtain which results in efficiency improvement of the converter. Performances at various operating conditions such as starting, dynamic and steady state behavior are consider and suitability of the proposed system is demonstrated using MATLAB/Simulink based simulation results.


  1. SPV array
  2. Luo converter
  3. BLDC motor
  4. Centrifugal water pump
  5. MPPT
  6. Switch utilization



Fig. 1 Configuration of proposed SPV array-Luo converter fed BLDC motor drive for water pumping system.



Fig. 2 Performances of SPV array of the proposed SPV array-Luo converter

fed BLDC motor drive for water pumping system.

Fig. 3 Performances of Luo converter of the proposed SPV array-Luo

converter fed BLDC motor drive for water pumping system.

Fig. 4 Performances of BLDC motor-pump of the proposed SPV array-Luo

converter fed BLDC motor drive for water pumping system.


A solar photovoltaic array fed Luo converter based BLDC motor has been proposed to drive water-pumping system. The proposed system has been designed, modeled and simulated using MATLAB along with its Simulink and sim-power system toolboxes. Simulated results have demonstrated the suitability of proposed water pumping system. SPV array has been properly sized such that system performance is not influenced by the variation in atmospheric conditions and the associated losses and maximum switch utilization of Luo converter is achieved.

Luo converter

Luo converter has been operated in CCM in order to reduce the stress on power devices. Operating the VSI in 120° conduction mode with fundamental frequency switching eliminates the losses caused by high frequency switching operation. Stable operation of motor pump system and safe starting of BLDC motor are other important features of the proposed system.


[1] Fei Ding, Peng Li, Bibin Huang, Fei Gao, Chengdi Ding and Chengshan Wang, “Modeling and simulation of grid-connected hybrid photovoltaic/battery distributed generation system,” in China Int. Conf. Electricity Distribution (CICED), 13-16 Sept. 2010, pp.1-10.

[2] Zhou Xuesong, Song Daichun, Ma Youjie and Cheng Deshu, “The simulation and design for MPPT of PV System Based on Incremental Conductance Method,” in WASE Int. Conf. Information Eng. (ICIE), vol.2, 14-15 Aug. 2010, pp.314-317.

[3] B. Subudhi and R. Pradhan, “A Comparative Study on Maximum Power Point Tracking Techniques for Photovoltaic Power Systems,” IEEE Trans. Sustainable Energ., vol. 4, no. 1, pp. 89-98, Jan. 2013.

[4] M. A. Eltawil and Z. Zhao, “MPPT techniques for photovoltaic applications,” Renewable and Sustainable Energy Reviews, vol. 25, pp. 793-813, Sept. 2013.

Novel High Performance Stand Alone Solar PV System with High Gain, High Efficiency DC-DC Converter Power Stages


This paper proposes a novel 3- stand-alone solar PV system configuration that uses high gain, high efficiency (96%) dc-dc converters both in the forward power stage as well as the bidirectional battery interface. The high voltage gain converters enable the use of low voltage PV and battery sources. This results in minimization of partial shading and parasitic capacitance effects on the PV source. Series connection of a large number of battery modules is obviated, preventing the overcharging and deep discharging issues that reduce the battery life. Also, the proposed configuration facilitates “required power tracking (RPT)” of the PV source as per the load requirements eliminating the use of expensive and ‘difficult to manage’ dump loads. High performance inverter operation is achieved through abc to dq reference frame transformation, which helps in generating precise information about the load’s active power component for RPT, regulation of ac output voltage and minimization of control complexity. Inverter output voltage is regulated by controlling the modulation index of sinusoidal pulse width modulation, resulting in a stable and reliable system operation. The active power demand is controlled by regulating the dc link voltage. All the analytical, simulation and experimental results of this work are presented.


  1. Power conversion
  2. Pulse width modulation converters
  3. Power conditioning, Inverters
  4. Three-phase electric power
  5. Power control
  6. Photovoltaic cells
  7. Energy conversion
  8. Solar power generation
  9. High gain DC-DC Converter
  10. MPPT





Fig. 1. Simplified block diagram of a two stage stand alone PV system


Fig. 2. Simulation results of the proposed system during the sequence of events considered

Fig.3 Dynamic response of the dc link: (a) An effective load (Reff) connected across the dc link; (b) Response to step change in effective load (200W to 400W); (c) Response to step change in reference dc link voltage, * Vdc from 250V to 400V.


 This paper has described and implemented a novel 3- solar PV inverter system for stand-alone applications. Considering that high PV side voltage leads to several drawbacks, a low voltage PV source is used in the system. The limitation of low voltage PV source is overcome by using a special high voltage gain front end dc-dc converter capable of operating at high efficiency and MPPT. The proposed scheme is particularly conducive to long battery life by as it ensures no battery overcharge or deep discharge. For this purpose, the   conventional MPPT scheme is replaced by RPT, which ensures only the required power is tracked from the PV source. This prevents the drawing of excess power from the PV source and the use and management of expensive ‘dump’ loads. Not only the main power stage, but the battery interfacing bi-directional stage also supports high voltage gain with high efficiency. Due to the use of special high gain, high efficiency converters in the power stage, the overall efficiency of the system is 94%. Preliminary investigations have yielded encouraging results. The capacity of the proposed control strategy can be enhanced for high power operation by interfacing other renewable sources (fuel cell stack, wind etc.) to the dc link of the proposed system without significantly altering the control strategy. In spite of the good performance of the proposed system, as verified through several simulation and experimental results, there are some limitations too, as listed below:

  1. The high gain, high efficiency dc-dc converters used in the proposed system may be difficult to design for high power levels.
  2. In the proposed system, battery is interfaced with the high voltage (400V) dc link requiring a high voltage gain, high efficiency dc-dc converter. Battery interfacing to the low voltage (40V) dc bus should be explored.
  3. The proposed system uses a large number of sensors, which may increase the cost and complexity. All these issues are being currently investigated and the findings will be reported in a future paper.


[1] S.R. Bhat, A. Pittet and B.S. Sonde, “Performance optimization of induction motor-pump system using photovoltaic energy source,” IEEE Transactions on Industry Applications, vol. IA- 23, no. 6, pp. 995–1000, Nov. 1987.

[2] S. Duryea, S. Islam and W. Lawrence, “A battery management system for stand alone photovoltaic energy systems,” 34th IEEE IAS Annual Meeting, vol. 4, pp. 2649-2654, Phoenix, AZ , 3rd – 7th Oct., 1999.

[3] M. Uzunoglu, O. C. Onar, and M. S. Alam, “Modeling, control and simulation of a PV/FC/UC based hybrid power generation system for stand-alone applications” Renewable Energy, vol. 34, no. 3, pp. 509-520, Mar. 2009.

[4] R. M. Cuzner and G. Venkataramanan, “The status of dc microgrid protection,” IEEE Industry Applications Society Annual  Meeting, pp. 1-8, 5th-9th Oct. 2008

[5] P. Sharma and V. Agarwal, “Exact maximum power point tracking of grid-connected partially shaded PV source using current compensation concept,” IEEE Transactions on Power Electronics, vol. 29, no. 9, pp. 4684-4692, Sep. 2014.

Sizing and Simulation of an Energy Sufficient Stand-alone PV Pumping System


 In this paper, methods for sizing of PV pumping systems and the simulation of (DTC) Direct Torque Control of induction motor that is used for managing a water pump supplied by a photovoltaic generator are presented. The sizing of the PV pumping system is based on the calculation of the water needs, the required hydraulic energy and the estimation of available solar power.

The best sizing of the PV pumping system may more help in reducing its cost and optimize its efficiency. The proposed system includes a solar panel, a DC/DC converter with MPPT control, a voltage inverter with pulse width modulation (PWM). The Pump is driven by a Three Phase Induction Motor. In order to control the water flow in the pump, Direct torque control of induction machine is used. The simulations are carried out in Matlab/Simulink.

  1. MPPT
  2. DTC
  3. PV pumping
  4. Photovoltaic
  5. Three phase induction motor
  6. Induction machine (IM)
  7. Voltage inverter
  8. Pulse width modulation (PWM)




Fig. 1. System block diagram


 Fig. 2. Band hysteresis of flux

Fig. 3. Statoric Flux evolution

Fig. 4. Electromagnetic Torque

Fig. 5. Stator current dq Axis

Fig. 6. The motor speed


In this paper, a case study of stand-alone PV pumping system designed for irrigation needs in a remote site in Tunisia. The sizing method for the structure was presented. MPPT technique was used to improve the power delivered by the photovoltaic module. Direct torque control technique served to control the induction machine speed and therefore the flow of the centrifugal pump. The paper presented the system block diagram, the MPPT control algorithm, the DTC block diagram and design.

The main objective of this work is to maximize savings in energy use by ensuring that pipelines and networks are sized and designed correctly. The use of DTC technique provide better efficiency of the motor. The experimental results are satisfactory and submit that the proposed solution can be a reliable option to overcome the lack of electricity at remote locations and rural areas. More reliability test and studies needs to be performed to guarantee its robustness, efficiency and cost effectiveness.


[1] “Solar resource maps for Tunisia”, Solargis S.R.O Slovakia, Maps.

[2] Chaabane. M, Ben Djemaa. A. and Kossentini, “A daily and hourly global irradiations in Tunisia extracted from Meteosat Wedax images”, Solar Energy, vol. 57, issue 6, pp. 449-457.

[3] Information obtained from the direction of the bureau of organic farming, CRDA Tozeur.

[4] T. Augustyn. “Energy efficiency and savings in pumping systems, The holistic approach”, Energy Efficiency Convention (SAEEC), 2012 Southern African.

[5] Jim McGovern, “Technical Note: Friction Factor Diagrams for Pipe Flow”, Dublin Institute of Technology, 2011.

Grid Interactive Bidirectional Solar PV Array FedWater Pumping System


 This paper proposes a grid interactive bidirectional solar water pumping system using a three phase induction motor drive (IMD). A single phase voltage source converter (VSC) is used to direct the flow of power from grid supply to the pump and back to the grid from SPV array. A boost converter is used for the maximum power point tracking (MPPT) of the SPV array. A smart power sharing control is proposed, with preference given to the power from SPV array over the grid power. Moreover, the grid input power quality is also improved. Various modes of operation of the pump are elaborated and the performance of the system at starting, in steady state and dynamic conditions are simulated. The simulated results show the novelty and the satisfactory performance of the system.


  1. Solar water pump
  2. MPPT
  3. Grid interactive
  4. Smart power sharing



Fig. 1. Configuration for the single phase grid interactive SPV water

pumping system


 Fig. 2(a) Starting performance of the proposed system in mode I

Fig. 3(b) Steady state performance of the proposed system in mode I

Fig. 4(c) Performance of the system in mode I under decreasing radiation

from 800 W/m2 to 500 W/m2

Fig. 5(d) Performance of the system in mode I under increasing radiation

from 500 W/m2 to 800 W/m2

Fig. 6(a) Starting performance of the system in mode II

Fig. 7(b) Steady state performance of the system in mode II


Fig. 8(a) Characteristics of the system in mode III with decrease in


Fig. 9(b) Characteristics of the system in mode III with increase in


Fig. 10(a) Characteristics of the system in mode IV with increase in


Fig. 11 (b) Characteristics of the system in mode III with decrease in



A single phase grid interactive solar water pumping is presented in the paper. Various modes of operation are identified and simulated in MATLAB Simulink environment. The simulated results have demonstrated the satisfactory performance of the system at starting, and in steady and dynamic conditions. The proposed system not only is able to share the power between two sources but it also improves the quality of power drawn. Moreover, the system manages to feed the power from the SPV array as in when required. The system is well suited for the rural and agricultural usage.


[1] J. Zhu, “Application of Renewable Energy,” in Optimization of Power System Operation, Wiley-IEEE Press, 2015, p. 664.

[2] Z. Ying, M. Liao, X. Yang, C. Han, J. Li, J. Li, Y. Li, P. Gao, and J. Ye, “High-Performance Black Multicrystalline Silicon Solar Cells by a Highly Simplified Metal-Catalyzed Chemical Etching Method,” IEEE J. Photovolt., vol. PP, no. 99, pp. 1–06, 2016.

[3] M. Steiner, G. Siefer, T. Schmidt, M. Wiesenfarth, F. Dimroth, and A. W. Bett, “43% Sunlight to Electricity Conversion Efficiency Using CPV,” IEEE J. Photovolt., vol. PP, no. 99, pp. 1–5, 2016.

[4] M. Kolhe, J. C. Joshi, and D. P. Kothari, “Performance analysis of a directly coupled photovoltaic water-pumping system,” IEEE Trans. Energy Convers., vol. 19, no. 3, pp. 613–618, Sep. 2004.

[5] S. R. Bhat, A. Pittet, and B. S. Sonde, “Performance Optimization of Induction Motor-Pump System Using Photovoltaic Energy Source,” IEEE Trans. Ind. Appl., vol. IA-23, no. 6, pp. 995–1000, Nov. 1987.

Solar Powered Based Water Pumping System Using Perturb and Observation MPPT Technique


This paper focuses on solar photovoltaic(PV) water pumping system the use of perturb and observation maximum power point tracking(MPPT) method. This total system is divided into two stages. In the first stage, an arrangement of PV modules is made which is a combination of number PV cells in series or parallel to extract the solar energy and convert into electricity. To maximize the power output of PV module, perturb and observation (P&O) MPPT technique has been used.


In its second stage, direct torque and flux control(DTFC) with space vector modulation(SVM) is used to control switching pulses of the voltage source inverter(VSI). The speed of induction motor drive is controlled by DTFC technique. The total system is developed in MATLAB and outputs are noticed.


  1. Solar PV array
  2. MPPT
  3. P&O Algorithm
  4. DC-DC Boost converter
  6. Induction motor



 Fig-1: Solar Water Pumping System


Fig. 2. DC link voltage (output voltage of the boost converter)

Fig. 3. output waveform of IMD under no load

Fig. 4. Waveforms under loading condition


In this paper control methods which manage the flow rate of water supply of solar powered based water pumping systen using IMD is decorated. From the simulation results it can be concluded that this system has good work.


As per view of irrigation system , the SPV array has been operated under standard enviromental conditions. The system is operated on maximum power by using P&O MPPT algorithm. Water flow rate and stator current of motor is controlled by the speed PI controller.


 [1] U. Sharma, S. Kumar, and B. Singh, “Solar array fed water pumping system using induction motor drive,” 1st IEEE Int. Conf. Power Electron. Intell. Control Energy Syst. ICPEICES 2016, 2017.

[2] M. A. G. De Brito, L. P. Sampaio, L. G. Jr, G. A. Melo, and C. A. Canesin, “Comparative Analysis of MPPT Techniques for PV Applications,” pp. 99–104, 2011.

[3] D. P. Hohm, “Comparative Study of Maximum Power Point Tracking Algorithms Using an Experimental, Programmable, Maximum Power Point Tracking Test Bed,” 2000.

[4] S. Member, “A Comparative study of different MPPT techniques using different dc-dc converters in a standalone PV system,” pp. 1690–1695, 2016.

[5] Z. Ben Mahmoud, M. Ramouda, and A. Khedher, “A Comparative Study of Four Widely-Adopted MPPT Techniques for PV Power Systems,” no. 1, pp. 16–18, 2016.

A Fuzzy Logic Control Method for MPPT of PV Systems


Maximum power point trackers are so important in photovoltaic systems to increase their efficiency. Many methods have been proposed to achieve the maximum power that the PV modules are capable of producing under different weather conditions. This paper proposed an intelligent method for maximum power point tracking based on fuzzy logic controller.  system consists of a photovoltaic solar module connected to a DC-DC Buck-boost converter. The system has been experienced under disturbance in the photovoltaic temperature and irradiation level.  simulation results show that the proposed maximum power tracker could track the maximum power accurately and successfully in all condition tested. Comparison of different performance parameters such as: tracking efficiency and response time of the system shows that the proposed method gives higher efficiency and better performance than the conventional perturbation and observation method.



Fig. 1: System used for simulation.


 Fig. 2: case 1: changing the solar radiation

Fig. 3: Case 1: performance of FLC method

Fig. 4: Case I: performance of P&O method

Fig, 5: Case 2: changing the solar radiation

Fig, 6: Case 2: performance of FLC method

Fig, 7: Case 2: performance of P&O method

Fig, 8: Changing the temperature

Fig, 9: Performance of FLC method

Fig, 10: Performance of P&O method


 Photovoltaic model using Matlab/STMULTNK and design of appropriate DC-DC buck-boost converter with a maximum power point tracking facility are presented in this paper. A new method for MPPT based fuzzy logic controller is presented and compared with the conventional P&O MPPT method. The models are tested under disturbance in both solar radiation and photovoltaic temperature. Simulation results show that the proposed method effectively tracks the maximum power point under different ambient conditions. oscillation around MPP is decreased and the response is faster in compared with the conventional methods. Comparing the tracking efficiency of both methods indicates that the proposed method has a higher efficiency than the conventional P&O MPPT method.


[1] Jancarle L. Dos Santos, Fernando L. M. Antunes and Anis Chehab, “A Maximum Power Point Tracker for PV Systems Using a High Performance Boost Converter”, Solar Energy, Issue 7, Vol. 80, pp. 772- 778,2005.

[2] Ting-Chung Yu and Tang-Shiuan Chien, “Analysis and Simulation of Characteristics and Maximum Power Point Tracking for Photovoltaic Systems”, Conference,P prpo.c 1e3ed3i9n g- s1 3o4f4 ,PT aoiwpeeri, 2E0l0e9c.t ronics and Drive Systems

[3] Roberto Faranda, Sonia Leva, “Energy Comparison of MPPT techniques for PV Systems”, Wseas Transctions on Power System, Issue 6, Vol. 3, pp. 446-455, June 2008.

[4] D. P. Hohm and M. E. Ropp, “Comparative Study of Maximum Power Point Tracking Algorithms using an experimental, programmable, maximum power point tracking test bed”,P roceedings of Photovoltaic Specialists Conference ,pp. 1699 – 1702, USA,2000.

[5] Trishan Esram and Patrick 1. Chapman, “Comparison of Photovoltaic Array Maximum Power Point Tracking Techniques”, Energy ConverSion, Issue 2, Vol. 22, pp. 439 – 449, May 2007.

A Direct Maximum Power Point Tracking Method for Single-Phase Grid Connected PV Inverters


A direct maximum power point tracking (MP PT) strategy for P V frameworks has been proposed in this work. This strategy unravels two of the primary disadvantages of the Perturb and Observe (P&O) MP PT, in particular: I) the trade off between the speed and the motions in relentless state, ii) the poor viability in unique conditions, particularly in low i r radiance when the estimation of signs turns out to be progressively touchy to clamor.


The proposed MP PT is intended for single-stage single-arrange matrix associated P V invert er s and depends on evaluating the swell of the quick P V power and voltage, utilizing a second-arrange summed up integrator-based quadrature flag generator (SO G I-Q S G). We broke down the worldwide soundness of the shut circle control framework and approved the proposed calculation through reenactment and analyses on an invert er test stage as per the EN 50530 standard. The test results affirm the execution of the proposed technique as far as both speed and following effectiveness.


Fig. 1. System configuration of single-stage single-phase grid-connected P V system.



Fig. 2. Experimental P V voltage wave forms after startup showing the convergence to MP P with different 𝐾 values.


Fig. 3. Start wave forms comparison for DC link voltage.

Fig. 4. The output P V power under trapezoidal i r radiance profile.

Fig. 5. DC link voltage under trapezoidal i r radiance profile

Fig. 6. Instantaneous efficiency under trapezoidal i r radiance profile.

Fig. 7. Experimental start wave forms of P V power for both methods.

Fig. 8. Experimental start wave forms comparison of DC link voltage.

Fig. 9. Experimental results of P V power under trapezoidal i r radiance profile.

Fig. 10. Experimental results for DC link voltage under trapezoidal i r radiance profile.

Fig. 11. Efficiency under static i r radiance for both methods.

Fig. 12. P V power for P&O under dynamic i r radiance profile according to EN 50530.

Fig. 13. P V power for the proposed method under dynamic i r radiance profile according to EN 50503.

Fig. 14. Efficiency comparison for the both methods from low-to-medium i r radiance

Fig. 15. Efficiency comparison for the both methods from medium-to-high i r radiance.


This paper has depicted the structure of a successful controller for direct achieving the most extreme power point for a solitary stage single-stage lattice associated P V invert er. The proposed technique has been structured dependent on the steadiness examination utilizing the L y a p u n o v quadratic capacity that is framed from the variety of vitality put away in the DC connect capacitor. From the reproductions and trial results on a propelled test stage and as indicated by the EN 50530 standard, it was affirmed that the proposed technique accomplishes high productivity in both static and dynamic conditions. Moreover, the proposed strategy is quick to achieve the MP P.