换相失败场景下虚拟惯性控制对风火打捆送端系统暂态过电压的影响分析  

Analysis of the Influence of Virtual Inertial Control on the Transient Overvoltage of the Wind-thermal-bundled Sending System in the Scenario of Commutation Failure

作　　者：裴林 王彤 赵伟 王灿 王佳明 孙奕 PEI Lin;WANG Tong;ZHAO Wei;WANG Can;WANG Jiaming;SUN Yi(State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources(North China Electric Power University),Changping District,Beijing 102206,China;North China Branch of State Grid Corporation of China,Xicheng District,Beijing 100053,China;State Grid Beijing Urban District Power Supply Branch,Xicheng District,Beijing 100032,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市昌平区102206 [2]国家电网有限公司华北分部,北京市西城区100053 [3]国网北京城区供电公司,北京市西城区100032

出　　处：《电网技术》2024年第11期4589-4597,共9页Power System Technology

基　　金：国家自然科学基金项目(52277096);国家电网有限公司华北分部科技项目(SGTYHT/21-JS-226)。

摘　　要：在直流系统换相失败期间,虚拟惯性控制在响应直驱风机并网点频率的同时,风机有功出力的改变将影响送端暂态过电压。为了分析虚拟惯性控制对送端暂态过电压的影响并指导虚拟惯性参数的选取,该文结合送端有功偏差量与无功偏差量的暂态变化特点,分析了风火打捆经直流送出系统场景下,换相失败期间整流侧换流母线暂态电压变化全过程。换相失败期间直流有功传输减小引起送端频率突增,虚拟惯性控制将减小风机发出的有功功率。通过分析表明,风机有功出力的减小将增大送端火电机组所在线路的有功偏差量,从而恶化送端暂态过电压。最后通过PSCAD平台,对上述内容进行了仿真验证,并分析了虚拟惯性控制比例、微分系数对过电压峰值的影响。得出虚拟惯性比例系数越大,火电机组所在线路的有功偏差量将越大,进而恶化送端暂态过电压的结论。During commutation failure of DC system,while virtual inertial control responds to the frequency of the grid point of the permanent magnet synchronous generator(PMSG),the change of the active power output of the fan is bound to affect the transient overvoltage at the sending end.In order to analyze the influence of virtual inertial control on the transient overvoltage and guide the selection of virtual inertial parameters,this paper combines the transient changes in the active and reactive power deviations at the sending end to analyze the whole process of the transient voltage change of the commutation bus on the rectifier side during commutation failure in the scenario of the wind-thermal-bundled through the DC sending system.During commutation failure,the reduction of DC active power transmission causes a sudden increase in the frequency of the sending end system,and the virtual inertial control will reduce the active power generated by the fan.The analysis shows that reducing the active output of the fan will increase the active power deviation of the line where the thermal power unit is located at the sending end,thereby worsening the transient overvoltage at the sending end.Finally,through PSCAD platform,the above contents are simulated and verified,and the influence of virtual inertial control proportion and differential coefficient on overvoltage peak value is analyzed.It is concluded that the larger the virtual inertia ratio coefficient,the greater the active power deviation of the line where the thermal power unit is located,which will worsen the transient overvoltage at the sending end.

关 键 词：风火打捆 换相失败 直驱风机 过电压 虚拟惯性 比例系数 

分 类 号：TM721[电气工程—电力系统及自动化]