摘要
受大规模新能源接入电网的网架特性约束以及新能源装备自身安全限制,高渗透率新能源并网后的静态电压问题逐渐影响到电力系统的安全稳定运行。伴随着电力电子器件的发展,柔性交流输电技术(flexible AC transmission system,FACTS)在调节线路潮流、改善静态电压稳定性方面的研究更加深入。文章探讨计及分布式静态串联补偿器(distributed static series compensator,DSSC)的新能源电网静态电压稳定性,从系统静态电压稳定性方面评估DSSC发挥的潮流控制效能。首先分析DSSC的等效电路及工作原理,并基于DSSC的等效功率注入模型得到潮流计算方程;其次,基于潮流计算方程提出能够反映系统静态电压稳定性的效能评估指标,计算分析接入不同容量新能源对静态电压稳定性的影响;最后通过IEEE 30节点系统对所提方法进行仿真验证,结果表明,DSSC能够有效调节薄弱节点电压,提升新能源电网的安全稳定性。
The issue of static voltage instability in high-permeability new energy sources has increasingly impacted the safe and stable functioning of power systems.This is due to limitations associated with the grid characteristics of large-scale new energy sources as well as inherent security constraints of the new energy equipment.With advancements in power electronic devices,the Flexible AC Transmission System(FACTS)has undergone deeper research for better regulation of power flow and improvement of static voltage stability.In this study,the static voltage stability of a new energy grid,with a focus on the role of a Distributed Static Series Compensator(DSSC),is examined.Furthermore,the efficacy of the DSSC is evaluated in controlling power flow based on its impact on the system's static voltage stability.First,the equivalent circuit and working principle of the DSSC were analyzed,and the power flow equations were obtained based on the equivalent power injection model of the DSSC.Based on the power flow calculation equation,an evaluation index is proposed to reflect the static voltage stability of the power system.Finally,the proposed method is verified using the IEEE-30 node system.The results show that the DSSC can effectively adjust the voltage of weak nodes and improve the safety and stability of the new energy power grid.
作者
仇晨光
张振华
李蓝青
李彦柳
周霞
马道广
QIU Chenguang;ZHANG Zhenhua;LI Lanqing;LI Yanliu;ZHOU Xia;MA Daoguang(State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 210008,China;Institute of Advanced Technology for Carbon Neutrality of Nanjing University of Posts and Telecommunications,Nanjing 210023,China)
出处
《电力建设》
CSCD
北大核心
2023年第10期33-40,共8页
Electric Power Construction
基金
国家自然科学基金项目(61933005)。
