| 引用本文: | 王子豪,牟龙华,方重凯.基于下垂控制的低压微电网故障控制策略[J].电力系统保护与控制,2020,48(22):84-90.[点击复制] |
| WANG Zihao,MU Longhua,FANG Chongkai.Fault control strategy of a low-voltage microgrid based on droop control[J].Power System Protection and Control,2020,48(22):84-90[点击复制] |
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| 摘要: |
| 下垂控制的分布式电源(Distributed Generation, DG)接入孤岛微电网时，可在故障时呈现电压源特性以维持母线电压稳定。针对低压线路与DG对短路电流贡献能力较弱的特点，分析了非故障与对称故障时DG输出功率与母线电压的关系。提出了故障时根据输出阻抗以设置有功、无功输出参考值与改进的下垂控制策略，解决了故障时电压骤降与频率波动对输出功率的影响。计及DG输出电流受限的情况下，实现了故障时以最大功率输出并尽可能提高母线电压的目的。仿真算例结果验证了所提方法的有效性。 |
| 关键词: 分布式电源 微电网 下垂控制 电压支撑 故障控制策略 |
| DOI：DOI: 10.19783/j.cnki.pspc.202013 |
| 投稿时间：2020-06-25修订日期：2020-10-12 |
| 基金项目:中央高校基本科研业务费用专项资金资助(22120200230) |
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| Fault control strategy of a low-voltage microgrid based on droop control |
| WANG Zihao,MU Longhua,FANG Chongkai |
| (Department of Electrical Engineering, Tongji University, Shanghai 201804, China) |
| Abstract: |
| When droop-controlled Distributed Generation (DG) is connected to an islanding microgrid, it can present voltage source characteristics under a fault condition and maintain voltage stability of buses. According to the characteristics of DGs’ weak contribution to short-circuit current in the low-voltage microgrid, the relationship between DG output power and bus voltage under non-fault and symmetrical fault conditions is analyzed. An improved droop control strategy is presented and the reference values of active and reactive power output are set according to the output impedance. Therefore, the influence of voltage sag and frequency fluctuation on the output power of DGs is avoided. Considering the current limiting output, DGs can output maximum power and improve the bus voltage when a fault occurs in the microgrid. The simulation results show the effectiveness of the proposed method.
This work is supported by Fundamental Research Funds for the Central Universities (No. 22120200230). |
| Key words: distributed generation microgrid droop control voltage support fault control strategy |
