Electrical Power Quality Enhancement of Grid Interfaced with Wind Power System Using STATCOM – Control Scheme

Electrical Power Quality Enhancement of Grid Interfaced with Wind Power System Using STATCOM – Control Scheme

ABSTRACT:

Infusion of the wind power into an electric grid influences the power quality. The exhibition of the wind turbine in this way power quality are resolved based on guidelines and the standards followed by the rule indicated in International Electro-technical Commission standard, IEC-61400. The impact of the wind turbine in the grid connected wind energy generation system are the active power, reactive power, voltage variations, harmonic distortion, flicker. The paper study exhibits the power quality issues due to establishment of wind turbine with the grid. In this proposed paper, STATCOM (Static Synchronous Compensator) is connected at point of common coupling (PCC) with a battery energy storage system (BESS) to reduce the power quality issues. The STATCOM control scheme for the grid associated wind energy generation system for power quality improvement is simulated utilizing MATLAB/SIMULINK. The viability of the proposed control scheme reduces reactive power from the load and induction generator. The advancement of the grid coordination rule and the plan for development in power quality standards as per IEC-standard on the grid has been introduced.

INDEX TERMSPower Quality, Renewable Energy, PCC (Power of Common Coupling), STATCOM (Static Synchronous Compensator), BESS (Battery Energy Storage System).

 SOFTWARE: MATLAB/SIMULINK

CONCLUSION:

The paper analyses the elements which influences the power quality in the wind energy generation system. Likewise this paper examines the execution of STATCOM-Control scheme for power quality improvement in grid associated wind energy generation system. The simulation of the proposed control scheme for the grid associated Wind energy generation is simulated utilizing MATLAB/SIMULINK. The control scheme has an ability to dispense with the harmonic parts of the load current and reactive power. Total Harmonic Distortion before the STATCOM connected was observed to be 24.62%, whereas, after STATCOM connection it was observed to be 2.54%. It additionally assists with keeping up the source voltage and current in-stage which makes maintaining power factor at source-end and thus supporting the demanding reactive power injection for the load at PCC and wind generator in the grid interfaced wind energy generation system. It allows an opportunity to upgrade the use factor of transmission lines.

 REFERENCES:

  • W Mohod, M.V Aware, ―A STATCOM control scheme for grid connected wind energy system for power quality improvement,‖ IEEE System Journal, Vol.2, issue 3, pp.346-352, Sept.2010
  • Yang, Student Member, IEEE, C. Shen, L. Zhang, M. L. Crow, and S.Atcitty, “Integration of a StatCom and Battery Energy Storage “-IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 16, NO. 2, MAY 2001.
  • Tatsuto Kinjyo, Tomonobu Senjyu, Katsumi Uezato, Hideki Fujita, and Toshihisa Funabashi, “Output Levelling of Wind Energy Conversion System by Current Source ECS” – IEEE Power Engineering Society General Meeting, 2004.
  • Kyungi Soo KOOK, Yilu LIU, Stan ATCITTY “Mitigation of the Wind Generation Integration Related Power Quality Issues by Energy Storage.”- Electrical Power Quality and Utilization, journal Vol.XII, no.2, 2006.
  • Kinjo. T and Senjyu. T, “Output leveling of renewable energy by electric double layer capacitor applied for energy storage system,” IEEE Trans. Energy Conv., vol. 21, no. 1, Mar. 2006

A Five Level Cascaded H-Bridge Multilevel STATCOM

2015, IEEE

ABSTRACT: This paper describes a three-phase cascade Static Synchronous Compensator (STATCOM) without transformer. Lt presents a control algorithm that meets the demand of load reactive power and also voltage balancing of isolated dc capacitors for H-bridges. The control algorithm used for inverter in this paper is based on a phase shifted carrier (PSC) modulation strategy that has no restriction on the cascaded number. The performance of the STATCOM for different changes of loads was simulated.

 KEYWORDS:

  1. STATCOM
  2. PSCPWM
  3. Cascaded Multilevel Inverter

 SOFTWARE: MATLAB/SIMULINK

BLOCK DIAGRAM:

Fig1.cascaded multilevel STATCOM.

EXPECTED SIMULATION RESULTS:

 

Fig. 2 Source voltage, source current and inverter current far inductive load(sourece current gain-5 and Inverter current gain-8).

Fig. 3 Load & Inverter Reactive componenets of current for Inductive load.

F ig. 4 Response of DC link voltage for inductive load.

Fig. 5 Source voltage and inverter current for the change of inductive load to half of the load at I sec(lnverter current gain-8)

Fig. 6 Load & Inverter Reactive componenets of current for the change of Inductive load to half of the load at I sec.

Fig. 7 Source voltage and inverter current for the change of inductive load to standby at 1 sec (Inverter current gain-8).

Fig. 8 Load & Inverter Reactive componenets of current for the change of Inductive load to standby at 1 sec

F ig. 9 Inverter Output Voltage

Fig. 10 Harmonie spectrum ofInverter line voltage.

Fig. 11 Load & Inverter reactive component for the change of Inductive to

capacitive load at 1.5 Sec.

Fig. 12 Response of oe link voltage for change in mode of operation from

inductive to capacitive load at 1.5 Sec.

Fig. 13 Inverter reactive component for the change of Inductive to capacitive load at 2 Sec

Fig. 14 Response of OC link voltage for change in mode of operation from inductive to capacitive at 2 Sec

CONCLUSION:

The cascaded H-bridge multilevel topology is used as one of the more suitable topologies for reactive-power compensation applications. This paper presents a new control strategy for cascaded H-bridge multilevel converter based STATCOM. By this control strategy, the dc-link voltage of the inverter is controlled at their respective values when the ST A TCOM mode is converted from inductive to capacitive. The dc link voltages of the inverter are kept balanced in all the circumstances, and the reactive power that is produced by the STATCOM is equally distributed among all the H-bridges.

REFERENCES:

[1] N. N. V. Surendra Babu, and B.G. Fernandes, ” Cascaded Two Level Inverter- Based Multilevel ST ATCOM for High-Power Applications,” IEEEE Trans. Power Delivery., vol. 29, no. 3, pp. 993-1001, lune. 2014.

[2] N.G. Hingorani and L. Gyagyi, “Understanding F ACTS”, Delhi, India: IEEE, 2001, Standard publishers distributors.

[3] B. Singh, R. Saha, A. Chandra, and K. AI- Haddad, ” Static synchronous compensators (ST A TCOM): A review, ” lET Power Electron., vol. 2, no. 4, pp. 297-324, 2009.

[4] Hirofumi Akagi, Shigenori Inoue and Tsurugi Yoshii, “Control and Performance of a Transformerless Cascade PWM ST A TCOM With Star Contiguration,” IEEE Trans. Ind. Appl., vol. 43, no. 4, pp. 1041-1049, July/ August 2007.

[5] H. Akagi, H. Fujita, S.Yonetaniand Y. Kondo, “A 6.6-kV transformerless ST ATCOM based on a tivelevel diode-clamped PWM converter: System design and experimentation of a 200-V 1 O-kV A laboratory model,” IEEE Trans. Ind. Appl., vol. 44, no. 2, pp. 672-680, Mar./Apr. 2008.