DOI:10.1007/s40565-017-0295-y |
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Flexible unbalanced control with peak current limitation for virtual synchronous generator under voltage sags |
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Page view: 0
Net amount: 915 |
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Author:
Tianwen ZHENG1, Laijun CHEN1,2, Yan GUO1, Shengwei MEI1,2
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Author Affiliation:
1. State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China;
2. Qinghai Key Lab of Efficient Utilization of Clean Energy, New Energy Photovoltaic Industry Research Center, Qinghai University, Xining 810016, China
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Foundation: |
National Natural Science Foundation of China (No. 51321005), Independent Research Program of Tsinghua University (No. 20151080416) and Area Foundation of National Natural Science Foundation of China (No. 51567021) |
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Abstract: |
Virtual synchronous generator (VSG) is gridfriendly for integrating distributed generations (DGs) since it can emulate the operation mechanism of traditional synchronous generator (SG). However, the traditional VSG control strategy, which is mainly suitable for balanced voltage conditions, may lead to power oscillations, current unbalance and even overcurrent under unbalanced voltage sags. To overcome this difficulty, a flexible unbalanced control with peak current limitation for VSG under unbalanced operating conditions is proposed. Based on the basic VSG control algorithm, the control strategy integrates two novel control modules, which are current reference generator (CRG) and power reference generator (PRG). The proposed control strategy can flexibly meet different operation demands, which includes current balancing, constant active or reactive power. And the injected currents are kept within safety values for a better utilization of the VSG power capacity. Furthermore, the experimental platform is built. Experimental results demonstrate the validness and effectiveness of the proposed control strategy. |
Keywords: |
Virtual synchronous generator, Unbalanced
control, Current reference generator, Power reference
generator, Voltage sags |
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Online Time:2018/01/23 |
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