STATCOM提升单LCC-HVDC馈入系统静态电压稳定裕度的机理分析  

Mechanism Analysis of STATCOM Increasing Static Voltage Stability Margin of Single-Infeed LCC-HVDC System

作　　者：马骞[1] 田宝烨 邱建[1] 徐光虎[1] 姚文峰 王彤 MA Qian;TIAN Baoye;QIU Jian;XU Guanghu;YAO Wenfeng;WANG Tong(Power Dispatching Control Center of China Southern Power Grid,Guangzhou 510663,China;State Key Laboratory of HVDC,Electric Power Research Institute,CSG,Guangzhou 510663,China)

机构地区：[1]中国南方电网电力调度控制中心,广州510663 [2]直流输电技术国家重点实验室(南方电网科学研究院),广州510663

出　　处：《南方电网技术》2020年第11期49-56,共8页Southern Power System Technology

基　　金：中国南方电网有限责任公司科技项目(ZDKJXM20180150)。

摘　　要：有效短路比ESCR和临界有效短路比CESCR是单LCC-HVDC馈入系统静态电压稳定裕度定量评价的常用指标,但该指标无法反映STATCOM馈入后系统静态电压稳定性的变化。本文以对小扰动的动态响应特性相同为原则把STATCOM在运行点附近线性化,将STATCOM馈入后的系统等值为单馈入系统,在等值单馈入系统中结合STATCOM的控制方式,具体讨论了STATCOM对系统结构参数和状态参数的影响,明确了STATCOM提升系统静态电压稳定裕度的机理。理论分析和电磁暂态仿真结果表明,可以通过比较等值单馈入系统中ESCR和CESCR的相对大小,准确评价STATCOM馈入后系统的静态电压稳定裕度。Effective short circuit ratio and critical effective short circuit ratio are common indicators for quantitative evaluation of the static voltage stability margin of a single-infeed LCC-HVDC system,but these indicators can not reflect the change of the static voltage stability of the system after STATCOM is fed in.This paper linearises STATCOM near the operating point based on the same dynamic response characteristics to small disturbances,equivalent the system containing STATCOM to a single-infeed system,specifically discusses the influence of STATCOM on the system structure parameters and state parameters combing the control mode of STATCOM in the equivalent single-infeed system and clarifies the mechanism by which STATCOM increases the static voltage stability margin of the system.Theoretical analysis and electromagnetic transient simulation results show that the static voltage stability margin of the system containing STATCOM can be accurately evaluated by comparing the relative sizes of ESCR and CESCR in the equivalent single-infeed system.

关 键 词：LCC-HVDC系统 STATCOM 静态电压稳定 短路比 

分 类 号：TM72[电气工程—电力系统及自动化]