基于线性补偿的宽频相量测量方法及其测试

Method and testing of wideband phasor measurement based on linear compensation

随着可再生能源发电和电网中电力电子设备的占比不断提高,电力系统的宽频振荡已成为制约可再生能源消纳的重要因素。为抑制高比例可再生能源电力系统的宽频振荡与满足保护需求,文章提出了一种宽频相量的测量方法,并研制了相应的装置。首先,该装置基于加窗的离散傅里叶变换算法和三峰插值算法,实现多路多模态电压、电流的宽频相量测量;然后,基于线性回归的方法补偿了高频振荡相量的幅值和相位测量结果,在保障动态响应速度的同时,有效提高了装置的测量精度;最后,基于测试仪和实时数字仿真平台测试验证了所研制装置的宽频相量测量性能,为保障新型电力系统安全稳定运行及可再生能源消纳提供了数据支撑。

With the high penetration of renewable energy and electronic equipment,the problem of wideband oscillation in power systems is becoming increasingly prominent,which has become a key factor restricting the efficient consumption of renewable energy.A wideband phasor measurement method is proposed and the corresponding device is developed to satisfy the requirements of wideband oscillation mitigation and protection in power systems with renewable energy.Based on the windowed discrete Fourier transform and three-peak interpolation,this device can measure multi-mode wideband phasor of multiple voltages and currents.Besides,the amplitude and phase of high-frequency phasor are compensated based on the linear regression,which effectively improves the measurement accuracy of the device while ensuring the dynamic response speed.Finally,the measurement performance of the developed device was verified by experimental testing with testers and real-time digital simulation,and the device can provide support for ensuring the safety and stability of power systems and the consumption of renewable energy.