摘要:
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.
Abstract:
In ultra high voltage direct current(UHVDC) transmission system, in order to realize the function of the reactive power control to mitigate the harms of the harmonics produced by the converters to the system and the primary equipments, then to balance the reactive power exchanged between the AC and DC systems. Taking Yunnan-Guangdong ±800 kV UHVDC transmission project as an example, the voltage control, reactive power control and harmonic performance control for the DC filter groups switching was analyzed, and certain strategies to optimize the control logic of the DC filter groups were presented: pole control system for the station control system of the reference voltage was changed to the current voltage, at the same time increase a logic judgement that used to determine each pole whether effective unlocked, in order to eliminate filter group reactive power values and avoid excessive input filter system. This optimization strategy can fully solve the problems of station control in Yunnan-Guangdong project and have good reference value for the following UHVDC transmission project.
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