风电经特高压直流送出系统的暂态过电压问题研究综述

Review on transient overvoltage issues of wind power transmission system via UHVDC

大规模风电通过特高压直流线路外送时,换相失败、直流闭锁等故障引发的暂态过电压问题严重影响了系统的安全稳定运行,制约了系统的输电能力。针对风电经特高压直流送出系统暂态过电压问题的研究步骤和关键技术挑战,从系统仿真建模、暂态过电压根源解析、抑制策略设计3个方面,分别进行总结和综述:从大规模风电经特高压直流送出系统的仿真建模出发,梳理、评述了各主要部分的建模方法及其优缺点;阐述了2类典型暂态过电压的演化过程,解析了其产生根源、影响因素及量化分析方法;根据控制策略的实施对象,从系统级保护控制、直流系统控制、风电集群控制、无功补偿控制等方面,对比分析了各种控制方法的优势与不足。分别针对上述3个方面梳理总结了现有成果并对研究趋势进行了展望,以期为大规模风电经特高压直流外送系统的故障穿越控制提供依据。

When large-scale wind power is transmitted through UHVDC(Ultra-High Voltage Direct Current)lines,transient overvoltage issues caused by commutation failure,DC blocking,and so on,seriously affect the system safe and stable operation and restrict system transmission capacity.The research steps and key technical challenges of transient overvoltage issues of wind power transmission system via UHVDC are summarized and reviewed respectively from three aspects of system simulation and modeling,cause analysis of transient overvoltage and design of suppression strategies.Based on the simulation and modeling of largescale wind power transmission system via UHVDC,the modeling methods and their advantages and disadvantages are reviewed.The evolution process of two types of typical transient overvoltage is described,and the causes,influencing factors and quantitative analysis methods are analyzed.According to the implementation object of control strategies,the advantages and disadvantages of various control methods are compared and analyzed from the aspects of system-level protection control,DC system control,wind power cluster control and reactive power compensation control.In view of the above three aspects,the existing results are summarized and the research trends are prospected,in order to provide the basis for fault ride-through control of large-scale wind power transmission system via UHVDC.