基于暂态最高电压约束的直流整流站技术要求  

Research on Technical Requirement of DC Rectifier Station Determined by Transient Voltage Constraint

作　　者：周勤勇 张彦涛 刘增训 云雷 施浩波 ZHOU Qinyong;ZHANG Yantao;LIU Zengxun;YUN Lei;SHI Haobo(China Electric Power Research Institute,Beijing 100192,China;State Grid Corporation of China,Beijing 100031,China)

机构地区：[1]中国电力科学研究院有限公司,北京100192 [2]国家电网有限公司,北京100031

出　　处：《高电压技术》2020年第6期2057-2063,共7页High Voltage Engineering

基　　金：国家电网公司科技项目(适应不同网络条件的特高压直流安全稳定分析研究)(XT71-17-006)。

摘　　要：为了能够为特高压直流整流站选址及无功配置提供快速量化方法,通过分析直流故障后,典型直流整流站交流母线暂态电压曲线,揭示了整流站交流母线暂态电压升高的两阶段特性,即甩负荷后的电压突升和电容压升效应下的爬升阶段。根据两阶段特性,建立了整流站交流母线暂态最高电压解析计算方法。在此基础上,建立了整流站短路比与暂态最高电压之间的解析表达式。计算结果表明,基于直流整流站交流母线暂态最高电压限值标幺值不超过1.3要求,接入500kV交流电网整流站的最小短路比不应小于3.6。根据短路比要求,可以反向推导直流最大可输送功率,方法应用于上海庙-临沂直流,表明在配套火电6000~8000 MW时,直流最大可输送功率为8100~9300 MW配套两台300 MVA调相机后,直流可以在配套6000 MW电源下,达到额定功率10000 MW运行。In order to provide a fast quantification method for the site selection and reactive power allocation of UHVDC rectifier station,the typical transient voltage curves of AC buses in rectifier stations after DC faults are analyzed,and the two-stage characteristics of voltage rise,namely,the voltage rise after load rejection and the climb stage under increment of reactive power by capacitors,are revealed.Based on the characteristics,an analytical calculation method for voltage rise of AC bus in rectifier station is established.The relationship between short circuit ratio of DC and voltage rise of rectifier station is established.The result shows that the maximum limitation of transient voltage rise of AC bus should not exceed 1.3,and the short circuit ratio of rectifier station in rectifier station should be not less than 3.6.A method for calculating the maximum transmission power of UHVDC is proposed and applied to Shanghaimiao-Linyi UHVDC,and the results show that the maximum transmission power is 8100~9300 MW when the supporting thermal power is 6000~8000 MW.After two 300 MVA unit synchronous condensers are equipped,the the maximum transmission power can reach 10000 MW under 6000 MW supporting thermal power.

关 键 词：特高压直流 整流站 暂态电压 短路比 同步调相机 

分 类 号：TM721.1[电气工程—电力系统及自动化]