风火储联合多通道外送系统直流闭锁后的稳控措施

doi:10.11930/j.issn.1004-9649.202004123

摘要/Abstract

摘要： 针对直流闭锁造成的风火储联合多通道外送系统暂态过电压问题，首先分析闭锁后盈余无功功率、送端系统强度对交流系统暂态过电压的影响，其次梳理并分析除闭锁线路外的其余外送通道潮流转移、抽水蓄能和功率型储能对于闭锁故障的调节、调控机理，并根据各调节手段的特点确定动作时序，提出一种综合考虑多调节手段的协调稳控措施。最后基于DIgSILENT搭建哈密电网模型，对所提稳控措施进行仿真验证。仿真结果表明，多手段协调稳控措施可有效缓解暂态过电压问题，减少切机量，规避风电机组连锁脱网的风险，降低控制代价，提升交流系统协调恢复能力。

关键词: 交直流混联系统, 直流闭锁, 潮流转移, 抽水蓄能, 风火储联合系统, 稳控措施

Abstract: DC blocking can cause transient overvoltage in the wind-thermal-storage system with multi-channel delivery. Firstly, the paper analyzes the impact of the surplus reactive power and the strength of the sending-end system on the transient overvoltage of the AC system after blocking. Secondly, the paper analyzes the mechanism of various adjustment methods to deal with blocking faults, which include: the flow transfer of the remaining delivery channels except the blocking line, the regulation of pumped storage and power-type energy storage. And the action sequence is determined according to the characteristics of each method, and a coordinated stability control measure is proposed that comprehensively considers multiple adjustment methods. Finally, the Hami power grid model is built based on DIgSILENT for simulation verification. The simulation results show that coordinated multi-means stability control measure can effectively alleviate the transient overvoltage problem, reduce the number of machine cutting, avoid the cascading disconnection risk of wind turbines, reduce the control cost, and improve the coordination recovery ability of the AC system.

Key words: AC-DC hybrid connection, DC blocking, flow transferring, pumped storage, wind-thermal-storage hybrid system, stability control measure

赵吉贤, 李凤婷, 尹纯亚. 风火储联合多通道外送系统直流闭锁后的稳控措施[J]. 中国电力, 2021, 54(5): 65-73.

ZHAO Jixian, LI Fengting, YIN Chunya. Stability Control Strategy for Wind-Thermal-Storage Hybrid System with Multi-Channel Delivery under DC Blocking[J]. Electric Power, 2021, 54(5): 65-73.

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链接本文: https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202004123

https://www.electricpower.com.cn/CN/Y2021/V54/I5/65

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