低压减载整定方法综述

低压减载(Under Voltage Load Shedding,UVLS)作为最经济有效的防止电压崩溃的紧急控制措施,通常被用作电力系统稳定控制的最后一道防线。综述了美国、加拿大、日本等一些国外电网的低压减载方案,详细介绍了这些电网低压减载设置的目的、设计的原则、整定的方法以及典型的整定参数值。此外,还介绍了国内部分省网低压减载的应用情况及其整定特点。针对分布式和集控式两种不同类型的低压减载实施方案,全面分析了各自的优势和不足。在上述国内外典型案例的基础上,分析总结了低压减载方案设计过程中需要重点考虑的因素和一般性原则,可供国内电网规划和运行人员参考。

An overview of setting method of under voltage load shedding

Under voltage load shedding is considered as the most economic and efficient emergent control for transient voltage collapse,and is applied to power system as the last defense.In this paper,typical design methods of UVLS in different power grids of America,Canada,and Japan are overviewed,including motivation of applications,principles of design,setting methods and typical parameters of UVLS.UVLS schemes of several provinces in China are also introduced.As two kinds of major design schemes,difference between decentralized scheme and centralized scheme is compared thoroughly.Based on above materials,we analyze the key factors and general principles which should be taken into consideration during designing UVLS scheme,which may be referred by power system planners and operators.