BLDC Motor Driven Solar PV Array Fed Water Pumping System Employing Zeta Converter
This paper proposes a simple, cost effective and efficient brushless DC (BLDC) motor drive for solar photovoltaic (SPV) array fed water pumping system. A zeta converter is utilized in order to extract the maximum available power from the SPV array. The proposed control algorithm eliminates phase current sensors and adapts a fundamental frequency switching of the voltage source inverter (VSI), thus avoiding the power losses due to high frequency switching. No additional control or circuitry is used for speed control of the BLDC motor. The speed is controlled through a variable DC link voltage of VSI. An appropriate control of zeta converter through the incremental conductance maximum power point tracking (INC-MPPT) algorithm offers soft starting of the BLDC motor. The proposed water pumping system is designed and modeled such that the performance is not affected under dynamic conditions. The suitability of proposed system at practical operating conditions is demonstrated through simulation results using MATLAB/ Simulink followed by an experimental validation.
Fig.1 Configuration of proposed SPV array-Zeta converter fed BLDC motor drive for water pumping system
EXPECTED SIMULATION RESULTS:
Fig.2 Performances of the proposed SPV array based Zeta converter fed BLDC motor drive for water pumping
system (a) SPV array variables, (b) Zeta converter variables, and (c) BLDC motor-pump variables.
The SPV array-zeta converter fed VSI-BLDC motor-pump for water pumping has been proposed and its suitability has been demonstrated by simulated results using MATLAB/Simulink and its sim-power-system toolbox. First, the proposed system has been designed logically to fulfil the various desired objectives and then modelled and simulated to examine the various performances under starting, dynamic and steady state conditions. The performance evaluation has justified the combination of zeta converter and BLDC motor drive for SPV array based water pumping. The system under study availed the various desired functions such as MPP extraction of the SPV array, soft starting of the BLDC motor, fundamental frequency switching of the VSI resulting in a reduced switching losses, reduced stress on IGBT switch and the components of zeta converter by operating it in continuous conduction mode and stable operation. Moreover, the proposed system has operated successfully even under the minimum solar irradiance.
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This paper manages the execution investigation of a two-level, 24-beat Voltage Source Converters (VSCs) for High Voltage DC (HVDC) framework for power quality enhancement. A two dimension VSC is utilized to understand a 24-beat converter with least exchanging misfortune by working it at fundamental recurrence exchanging (FFS). The execution of this converter is contemplated on different issues, for example, consistent state activity, dynamic conduct, responsive power pay, control factor amendment, and sounds mutilation. Reproduction results are exhibited for a two dimension 24-beat converter to show its ability.
Fig. 1 A 24-Pulse voltage source converter based HVDC system Configuration
EXPECTED SIMULATION RESULTS
Fig. 2 Synthesis of Stepped AC voltage waveform of 24-pulse VSC.
Fig. 3 Steady state performance of proposed 24-pulse voltage source Converter
Fig. 4 Dynamic performance of proposed 24-pulse voltage source converter
Fig. 5 Waveforms and harmonic spectra of 24-pulse covnerter i) supply voltage ii) supply current (iii) converter voltage
A two dimension, 24-beat voltage source converter has been structured and its execution has been approved for HVDC framework to enhance the power quality with major recurrence exchanging. Four indistinguishable transformers have been utilized for stage move and to understand a 24-beat converter alongside control conspire utilizing a two dimension voltage source converter topology. The enduring state and dynamic execution of the planned converter setup has been exhibited the very attractive task and found appropriate for HVDC framework. The trademark sounds of the converter framework has likewise enhanced by the proposed converter design with least exchanging misfortunes without utilizing additional sifting necessities contrasted with the ordinary 12-beat thyristor converter.
This paper displays another control procedure no doubt and receptive power control of three-level multipulse voltage source converter based High Voltage DC (HVDC) transmission framework working at Fundamental Frequency Switching (FFS). A three-level voltage source converter replaces the regular two-level VSC and it is intended for the genuine and responsive power control is each of the four quadrants task. Another control strategy is produced for accomplishing the receptive power control by changing the beat width and by keeping the dc connect voltage consistent. The enduring state and dynamic exhibitions of HVDC framework interconnecting two unique frequencies arrange are shown for dynamic and responsive forces control. Complete quantities of transformers utilized in the framework are decreased in contrast with two dimension VSCs. The execution of the HVDC framework is likewise enhanced as far as decreased music level even at essential recurrence exchanging.
Fig. 1 A three-level 24-Pulse voltage source converter based HVDC system
Fig. 2 Control scheme of three-level VSC based HVDC system using dynamic dead angle (β) Control
EXPECTED SIMULATION RESULTS
Fig. 3 Performance of rectifier station during simultaneous real and reactive power control of three-level 24-pulse VSC based HVDC system
Fig. 4 Performance of inverter station during simultaneous real and reactive power control of three-level 24-pulse VSC based HVDC system
Fig. 5 Variation of angles (δ) and (β) values of three-level 24-pulse VSC based HVDC system during simultaneous real and reactive power control
Another control technique for three-level 24-beat voltage source converter setup has been intended for HVDC framework. The execution of this 24-beat VSC based HVDC framework utilizing the control technique has been exhibited in dynamic power control in bidirectional, free control of the receptive power and power quality enhancement. Another powerful dead point (β) control has been presented for three-level voltage source converter working at crucial recurrence exchanging. In this control the HVDC framework activity is effectively exhibited and furthermore an examination of (β) esteem for different responsive power necessity and symphonious execution has been completed in detail. In this way, the determination of converter task locale is progressively adaptable as indicated by the necessity of the responsive power and power quality.