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通信时延是电力系统广域网络化控制中不可忽略的问题,对带有时延的远端量测信号进行预测补偿极具工程实用价值。文章介绍了包含时延补偿器的广域控制系统结构;基于电力系统中广域控制器输入信号(例如角速度、功角等)可采用衰减三角函数的线性组合准确近似的特点,提出了改进Prony预测补偿算法以及评价预测补偿效果的指标;提出了基于巴特沃斯低通滤波器的抗噪声方法,并通过修正Prony模型参数补偿滤波环节引入的相移。最后使用四机二区域系统暂态仿真曲线和浙江电网PMU实测数据,采用不同预测补偿算法进行了测试验证,结果表明提出的改进Prony预测补偿算法对信号噪声具有良好的抗噪性,可准确实现时延信号的实时预测补偿,满足工程应用需求。
Communication delay is a problem that can not be neglected in wide area networked control of power system. Prediction and compensation of remote measurement signal with time delay is very practical. In this paper, the structure of a wide area control system with time delay compensator is introduced. Based on the fact that the linear combination of attenuated trigonometric functions can accurately approximate the input signals of wide area controller (such as angular velocity and power angle) in power system, Prediction compensation algorithm and the index of predicting compensation effect. An anti-noise method based on Butterworth low-pass filter is proposed, and the phase shift introduced in the filtering part is compensated by modifying Prony model parameters. Finally, the transient simulation curves of four machines and two regional systems and the measured data of PMU in Zhejiang Power Grid were used and tested with different prediction and compensation algorithms. The results show that the proposed improved Prony prediction and compensation algorithm has good noise immunity for signal noise and can be accurately implemented Real-time prediction of delay signal compensation, to meet the engineering needs.