引用本文: | 彭 忠,孙攀磊,韩 伟,等.LCC与VSC级联的特高压混合直流输电系统控制策略[J].电力系统保护与控制,2021,49(19):162-172.[点击复制] |
PENG Zhong,SUN Panlei,HAN Wei,et al.Control strategy of a hybrid UHVDC transmission system cascaded by LCC and VSC[J].Power System Protection and Control,2021,49(19):162-172[点击复制] |
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摘要: |
受端为电网换相换流器(Line Commutated Converter, LCC)与电压源换流器(Voltage Source Converters, VSC)级联的特高压混合直流输电系统能够抑制受端LCC换相失败导致的功率传输中断,系统接线方式和控制方式变得灵活和多样化。针对受端交流系统故障穿越,提出了基于直流电压与受端交流电压的低压限流控制策略和LCC限压恢复策略。针对多换流器的稳定运行,提出了多换流器功率协调控制策略和VSC在线投退策略。针对直流线路故障穿越,提出了基于直流电压偏差控制的穿越策略。基于电磁暂态程序(PSCAD/EMTDC)搭建了LCC与VSC级联的特高压混合直流输电系统仿真模型。仿真结果验证了所述控制策略的有效性。 |
关键词: 特高压混合直流输电 交流系统故障穿越 功率协调控制 换流器投退 直流线路故障穿越 |
DOI:DOI: 10.19783/j.cnki.pspc.201354 |
投稿时间:2020-11-05修订日期:2021-01-20 |
基金项目:国家电网有限公司总部科技项目“混合多端直流输电线路故障保护与自适应重合方法研究”(52170218000M) |
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Control strategy of a hybrid UHVDC transmission system cascaded by LCC and VSC |
PENG Zhong1,SUN Panlei1,HAN Wei2,LI Tai1,ZHAO Jing1 |
(1. XJ Electric Co., Ltd., Xuchang 461000, China; 2. State Grid Henan Electric Power Company
Research Institute, Zhengzhou 450052, China) |
Abstract: |
A hybrid UHVDC transmission system cascaded by a Line Commutated Converter (LCC) and Voltage Source Converters (VSC) at the receiving station can prevent power interruption caused by commutation failure of the LCC at receiving station. The connection control modes become more flexible and diversified. Current which depends on a low voltage control strategy based on the DC and AC voltages of the receiving terminal and an LCC for the limiting voltage control strategy are proposed for AC fault crossing at the receiving station. To obtain stable operation of multi-converters, a power coordination control strategy of multi-converters and a VSC online inputting/quitting strategy are proposed. A crossing strategy based on DC voltage deviation control is proposed for DC line fault crossing. A simulation model is constructed for the hybrid UHVDC system cascaded by LCC and VSC using an electromagnetic transient program (PSCAD/EMTDC). The simulation results show the validity of proposed control strategies.
This work is supported by the Science and Technology Project of the Headquarters of State Grid Corporation of China “Research on DC Line Fault Protection and Self-adaptive Coincidence Method for Hybrid Multi-terminal HVDC Transmission System” (No. 52170218000M). |
Key words: hybrid UHVDC transmission AC fault crossing power coordinated control converter inputting/ quitting DC line fault crossing |