基于自适应阈值的换相失败预防优化
摘要：电网换相换流器高压直流(line commutated converter high voltage direct current , LCC-HVDC)在逆变侧交流系统故障时，容易出现换相失败。换相失败预测(commutation failure prevention , CFPREV)是避免换相失败的主要手段，为解决其给定阈值不能满足所有故障工况的问题，从换相失败原理出发，分析CFPREV启动阈值和触发角调节量增益与换相失败之间的关系、交流母线电压对启动阈值和触发角调节量增益的影响以及故障时刻对启动阈值的影响，提出以交流母线电压为指标，对启动阈值和增益进行优化，在一定程度上提升了换相失败免疫能力。通过PSCAD/EMTDC电磁暂态仿真平台进行仿真验证，结果表明优化后的CFPREV相比于常规的CFPREV能够更有效地抑制换相失败的发生。
Abstract:When a failure occurred in the AC system at the inverter side of the line commutated converter-based high voltage direct current (abbr. LCC-HVDC) power transmission grid, then the commutation failure is easy to occur. For this reason, the commutation failure prevention (abbr. CFPREV) is the main measure to avoid the commutation failure. To solve the problem that the given CFPREV threshold could not suit to all fault conditions, starting from the principle of commutation failure, the relation between commutation failure and the two factors, i.e., the CFPREV start threshold and the regulating quantity gain of trigger angle was analyzed, similarly the influence of AC busbar voltage on CFPREV start threshold and the regulating quantity gain of trigger angle as well as the influence of the time of failure occurrence on the CFPREV start threshold were analyzed. It was proposed that taking AC busbar voltage as indicator the CFPREV start threshold and the gain were optimized, so the immunity for the commutation failure was improved to a certain degree. The proposed method is verified by the simulation on PSCAD/EMTDC platform, and simulation results show that the comparing with conventional CFPREV start threshold the optimized CFPREV start threshold can suppress the occurrence of commutation failure more effectively.
标题：基于自适应阈值的换相失败预防优化
英文标题：Optimization of Commutation Failure Prevention by Adaptive Threshold
作者：闪志成, 顾丹珍, 张双宝,
关键词：高压直流输电, 换相失败, CFPREV, 启动阈值, 触发角调节量, 增益,
发表日期：2022-10-10
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