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在特高压直流输电系统中,为了实现无功控制减轻换流站谐波对交直流系统及主设备的危害,进而保证交直流系统无功交换满足系统要求的目的,以云南-广东±800 kV特高压直流输电工程为例,分析了直流系统控制滤波器投切的电压控制、无功交换控制和谐波性能控制,提出了相关的控制逻辑优化策略:修改极控系统送给直流站控系统的电压,由参考电压改为实际电压,同时增加一个判断逻辑判断每极是否有效解锁,以避免所有滤波器投入来满足谐波性能需求;加入滤波器小组电流判断逻辑,以消除滤波器小组无功功率取值问题,避免系统过多投入滤波器.试运行情况表明,该优化策略能够解决云广工程站控系统存在的缺陷,为其他特高压直流工程的设计提供有益的参考.
In the UHV DC transmission system, in order to realize the reactive power control to reduce the harm of the harmonic of the converter station to the AC and DC systems and the main equipment, and to ensure the reactive power exchange between the AC and DC systems to meet the system requirements, Taking UHVDC transmission project as an example, the voltage control, reactive power exchange control and harmonic performance control of DC system control filter are analyzed, and the relevant control logic optimization strategy is proposed: modify the pole control system to DC station control system Of the voltage from the reference voltage to the actual voltage, while adding a judging logic to determine whether each pole is effectively unlocked, in order to avoid all the filter input to meet the harmonic performance requirements; Add filter group current decision logic to eliminate the filter group The power value of the system can avoid the system from putting too much filter.The trial operation shows that the optimization strategy can solve the defects of the station control system of Yun Guang Engineering and provide a useful reference for the design of other UHVDC projects.