±500kV三端直流系统在线极退出功能控制策略及系统响应研究

Research on Control Strategy and System Response of Online Pole Exit Function of±500 kV Three-terminal DC System

为研究极退出功能在多端直流工程中应用的可行性、控制策略的完整性及控制系统响应的正确性,结合±500 kV禄高肇直流工程控制系统程序,梳理出了三端运行时“二送一”和“一送二”两种运行模式下极退出功能的控制逻辑,总结出两种运行模式下极退出功能的异同点。通过分析仿真试验平台三端运行时“二送一”模式下禄劝换流站极1退出产生的录波波形,验证了极退出功能控制策略及控制系统响应的正确性。最后通过分析工程实际投运三端“二送一”运行时,禄劝站极1退出产生的禄劝、高坡两站录波波形,发现电流量变化趋势、开关量变化与试验仿真结果基本一致,且符合控制策略的设计。这验证了极退出功能在±500 kV三端直流系统中应用的可行性,也为今后的三端直流系统设计和建造提供了参考依据。

In order to study the feasibility of pole exit function in multi-terminal DC engineering,the integrity of control strategy and the correctness of control system response,combined with±500 kV Lukaozhao DC project control system program,thecontrol logic of pole exit function under two operation modes of"two transmission one"and"one transmission two"in three terminal operation mode is sorted out and the similarities and differences of pole exit function under two operation modes are summarized.By analyzing the recorded waveforms generated by the pole 1 exit of the Luquan converter station in the"two get one free"mode when the three-terminal simulation test platform is running,the correctness of the pole exit function control strategy and the control system response is verified.Finally,the wave recording wave of Luquan and Gaopo stations produced by the exit of Luquan station pole 1 during the actual operation of the project is analyzed.It is found that the trend of electric flow change,the change of switch quantity are basically consistent with the experimental simulation results,and conform to the design of control strategy.Finally,the wave recording wave of Luquan and Gaopo stations produced by the exit of Luquan station pole 1 during the actual operation of the project is analyzed.It is found that the trend of electric flow change,the change of switch quantity are basically consistent with the experimental simulation results,and conform to the design of control strategy.