考虑风电场调控裕度的风火打捆直流外送系统无功电压紧急控制策略  

Reactive Voltage Emergency Control Strategy of Wind-Thermal-Bundled DC Transmission System Considering Wind Farm Regulation Margin

作　　者：周文俊 曹毅 李杰 金涛 陈文剑 周霞 ZHOU Wenjun;CAO Yi;LI Jie;JIN Tao;CHEN Wenjian;ZHOU Xia(State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 210008,China;Institute of Advanced Technology,Nanjing University of Posts and Telecommunications,Nanjing 210023,China)

机构地区：[1]国网江苏省电力有限公司,江苏南京210008 [2]南京邮电大学先进技术研究院,江苏南京210023

出　　处：《中国电力》2023年第4期77-87,共11页Electric Power

基　　金：国家自然科学基金资助项目(多重耦合不确定影响下智能电网多时空尺度协调控制与主动防御,61933005)。

摘　　要：为抑制直流送端电网暂态过电压,充分发挥风电在风火打捆直流外送系统功率调节作用,提出了一种考虑风电场调控裕度的无功电压紧急控制策略。首先,分析换相失败故障下风火打捆系统电气量变化及故障引发直流送端过电压机理;其次,在遭遇换相失败故障后通过降低直流输送功率抑制直流系统连续换相失败,减少故障恢复期间系统无功需求,分析功率速降后系统无功潮流变化;再次,针对盈余无功导致送端暂态高压提出直流送端无功电压紧急控制策略,根据超短期预测风速对风电场无功裕度进行分配,针对不同情形设计具有多种工作模式的风机控制器;仿真结果表明:所提控制方法能够较好地解决风火打捆直流外送系统直流送端暂态过电压问题。In order to suppress the transient overvoltage of direct current(DC)sending-end power grid and make full use of wind power in the power regulation of wind-thermal-bundled DC transmission system,a reactive voltage emergency control strategy considering wind farm regulation margin is proposed.Firstly,the change in the electrical quantity of the wind-thermal-bundled system under commutation failure and the overvoltage mechanism of the DC sending end caused by the failure are analyzed.Secondly,after the commutation failure,the continuous commutation failure of the DC system is suppressed by reducing the DC transmission power.Therefore,the reactive power demand of the system during the fault recovery period is reduced,and the reactive power flow change in the system after the power drop is analyzed.Thirdly,the reactive voltage emergency control strategy of the DC sending end is proposed for the transient high voltage of the sending end caused by surplus reactive power.The reactive power margin of the wind farm is allocated according to the ultra-short-term predicted wind speed,and the wind turbine controller with multiple working modes is designed for different situations.Finally,the simulation results show that the proposed control method can better solve the transient overvoltage problem at the DC sending end of the wind-thermal-bundled DC transmission system.

关 键 词：风火打捆直流外送 电压越限 自适应无功控制策略 自适应下垂控制 有功削减控制 

分 类 号：TM714.2[电气工程—电力系统及自动化]