An Electromagnetic Var Compensator Suitable for Wind Power Access and Its Control Strategy
Abstract
:1. Introduction
- (1)
- Proposing the topology of an electromagnetic var compensator (EVC) and analyzing its working principle.
- (2)
- Presenting a reactive power compensation control strategy that is suitable for the EVC.
- (3)
- Verifying the feasibility and effectiveness of the proposed topology and reactive power compensation control strategy through simulations.
2. Model of the EVC Based on Rotary Phase-Shifting Transformer (RPST)
2.1. RPST
2.2. Topology of the EVC
3. Working Principle of the EVC
4. Parallel Steady-State Mathematical Model and Control Strategy of the EVC
4.1. Parallel Steady-State Mathematical Model of the EVC
4.2. Control Strategy
5. Simulation Analysis
5.1. Adjustment Range of the EVC
5.2. Adjustment Effect Analysis of the EVC
5.2.1. Capacitive Condition
5.2.2. Inductive Condition
6. Experimental Verification
7. Conclusions
- (1)
- This study proposes a new topology of a shunt reactive power compensation device by replacing the power switching tube bridge of an VSC with RPSTs, which exhibits the features of a simple structure, low costs, no need to provide a separate power supply and isolation transformer, high voltage, and large capacity. The proposed topology can meet the requirements of power systems with a high percentage of wind power for the precise adjustment of reactive power compensation equipment, economic cost, easy operation and maintenance, strong shock resistance, and good tolerance.
- (2)
- Applying the instantaneous reactive power theory, a double closed-loop control strategy for the EVC, including power external and current internal loop controls, is proposed in this work. This strategy exhibits the characteristics of robustness and high control accuracy.
- (3)
- It is verified by simulation that the EVC topology and control strategy proposed in this paper can be applied to the power system with reactive power fluctuation after wind power is connected. The EVC is capable of bidirectional, continuous, and large-capacity compensation. The EVC has the ability to compensate precisely within its rated regulation range, providing new ideas for reactive power compensation devices and their control strategies.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Parameter | Value |
---|---|
Power voltage es/V | 690 |
Power Equivalent Impedance Zs/Ω | 0.01 + j1 × 10−5 |
Inductance L/mH | 0.11 |
RPST rated capacity/MVA | 2 |
RPST rated voltage/V | 690 |
RPST stator side impedance (pu) Zs | 0.01 + j0.11 |
RPST rotor side impedance (pu) Zr | 0.01 + j0.11 |
RPST magnetizing inductance (pu) Lm | 3.36 |
Capacitance C/mF | 3.68 |
Scale factor of power outer-loop controller Kp_Q | 0.1 |
Integral factor of power outer-loop controller Ki_Q | 3 |
Scale factor of active current controller Kp_d | 0.1 |
Integral factor of active current controller Ki_d | 20 |
Scaling factor of reactive current controller Kp_q | 0.1 |
Integral factor of reactive current controller Ki_q | 20 |
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Yan, X.; Guo, Y.; Jia, J.; Aslam, W.; Qi, B.; Wang, Y.; Xu, X. An Electromagnetic Var Compensator Suitable for Wind Power Access and Its Control Strategy. Energies 2022, 15, 5572. https://doi.org/10.3390/en15155572
Yan X, Guo Y, Jia J, Aslam W, Qi B, Wang Y, Xu X. An Electromagnetic Var Compensator Suitable for Wind Power Access and Its Control Strategy. Energies. 2022; 15(15):5572. https://doi.org/10.3390/en15155572
Chicago/Turabian StyleYan, Xiangwu, Yan Guo, Jiaoxin Jia, Waseem Aslam, Bingbao Qi, Yang Wang, and Xiaolin Xu. 2022. "An Electromagnetic Var Compensator Suitable for Wind Power Access and Its Control Strategy" Energies 15, no. 15: 5572. https://doi.org/10.3390/en15155572
APA StyleYan, X., Guo, Y., Jia, J., Aslam, W., Qi, B., Wang, Y., & Xu, X. (2022). An Electromagnetic Var Compensator Suitable for Wind Power Access and Its Control Strategy. Energies, 15(15), 5572. https://doi.org/10.3390/en15155572