| 引用本文: | 聂永刚,李俊青,韩 爽,等.基于虚拟惯量的DC换流器并联直流配电网控制策略[J].电力系统保护与控制,2020,48(15):19-26.[点击复制] |
| NIE Yonggang,LI Junqing,HAN Shuang,et al.Virtual inertia-based control strategy for a multi parallel DC converter in a DC distribution system[J].Power System Protection and Control,2020,48(15):19-26[点击复制] |
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| 摘要: |
| 直流配电系统中电源或者负荷大多通过DC变换器接入系统，其负阻尼特性会导致系统振荡甚至诱发失稳，直流配电系统的稳定性面临着越来越多的挑战。基于动态导纳建模方法，建立了含多台DC换流器的直流配电系统小扰动稳定模型。基于奈奎斯特稳定判据，分析了并联DC台数、直流配电线路等因素对稳定性的影响。提出了基于虚拟惯量的DC换流器分散控制策略，在不改变平衡运行点的基础上，有效提高了多DC换流器并联的稳定性。最后通过时域仿真验证了所提策略的有效性和正确性。 |
| 关键词: 海岛微电网 蓄电池 柴油发电机 协同控制 |
| DOI：DOI: 10.19783/j.cnki.pspc.191098 |
| 投稿时间：2019-09-09修订日期：2020-03-02 |
| 基金项目:国家自然科学基金面上项目资助(51977142)“互联多微电网的中压柔性直流配电系统灵活功率控制与稳定性研究” |
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| Virtual inertia-based control strategy for a multi parallel DC converter in a DC distribution system |
| NIE Yonggang,LI Junqing,HAN Shuang,ZHENG Xin,ZHANG Wentao,LI Xialin,GUO Li |
| (1. Inner Mongolia Electric Power (Group) Co., Ltd. Training Center, Hohhot 010010, China;
2. Inner Mongolia Power Group Synthesis Energy Co., Ltd., Hohhot 010020, China;
3. Key Laboratory of Smart Grid of Ministry of Education (Tianjin University), Tianjin 300072, China) |
| Abstract: |
| Most sources or loads are integrated into a DC distribution system through a DC converter, but the negative damping of a DC converter will lead to system oscillation and even instability. The stability of DC distribution systems is facing increasing challenges. Based on the dynamic admittance modelling method, a small disturbance stability model of a DC distribution system with multiple DC converters is established. The influence of the number of parallel DC converters and DC distribution lines on the stability is analyzed by the Nyquist stability criterion. A decentralized virtual inertia control strategy for DC converters is proposed. It can effectively improve the DC distribution system stability with multi parallel DC converters without changing the equilibrium point. Finally, the validity and correctness of the proposed strategy are verified by time domain simulation.
This work is supported by National Natural Science Foundation of China (No. 51977142). |
| Key words: islanded microgrid battery diesel generator combined control |
