作　　者： ; ; ; ;

机构地区： 清华大学

出　　处： 《电力系统自动化》 2013年第14期25-31,共7页

摘　　要： 广域电力系统稳定器(WPSS)是抑制电力系统区间模式振荡最有效的方法之一。WPSS以相量测量单元(PMU)量测的远方同步信号为反馈输入,在将其应用到工程实际时需要着重考虑远方信号的时延问题。从长期来看,时延通常会在一定范围内呈现一定的随机分布特性。文中设计了一种自适应分段时延补偿器,将时延分为若干个区间,对每一个区间设计时延补偿。时延补偿器根据在线量测得到的实际时延自适应地调整控制器的时延补偿区间,以达到最优补偿的目的。文中重点讨论了时延分段的方法以及时延补偿器自适应调整的规则。将提出的自适应分段时延补偿器在两区四机系统中实现,不同工况下的数值仿真结果表明了补偿器的有效性和鲁棒性。RTDS实验结果进一步表明所提方法可行且有效。该方法考虑了长时期内时延的变化,符合工程实际情况,适合于现场工程应用。 Wide-area power system stabilizer （WPSS） is one of the most effective methods to damp inter-area low frequency oscillation in power system. Remote synchro-phasor data of phasor measurement unit （PMU） as feed back input of WPSS must be considered time delay of remote signal when applying it to real projects. In the long term, time delay in power network usually presents certain random distribution characteristics in certain range. However, as the remote signals usually take time to be transmit PMU data via the internet through a series of routers to a control center, a key step in wide-area damping controller design is time delay compensation. Especially when WPSS is implemented in a real project, a time delay compensator to deal with time-varying delay should be designed, as in a long term, the delay in power network is time-varying randomly. An adaptive sectional time delay compensator is designed. The time delay is divided into several intervals and time delay compensators are designed for each interval. Then the time delay compensator will adaptively select the appropriate interval compensator to use according to the time delay measured online, so that optimal compensation can be reached. The method for dividing the time delay and the rule of adaptively adjust of time delay compensator are also discussed. And the compensator is illustrated with a 2-area 4-machine power system. The numerical simulation results on different operation modes show the feasibility, effectiveness and robustness of the compensator. The real time digital system （RTDS） test results also show that the proposed method is feasible and effective. This method considers the variation of time delay in a long time, and is applicable in practical engineering.

关 键 词： 低频振荡 广域量测系统 阻尼控制 时延补偿 自适应控制

领　　域： [电气工程]