面向电力电子化电网的宽频测量技术探讨

高压直流输电、柔性交流输电系统(FACTS)的应用以及新能源大规模并网为电网引入了大量电力电子设备，给电网注入了大量的间谐波和高次谐波等宽频信号，使得电网逐步呈现电力电子化的发展趋势。现有的测量设备重点关注工频信号测量，无法应对宽频信号测量所提出的挑战。文中分别从现有测量设备的局限、相量测量单元(PMU)升级改进的局限和高频信号测量的局限三个方面分析了现有测量技术的现状，针对性地提出了宽频测量技术总体方案，设计了总体架构，并讨论了具体实现所涉及的宽频信号范围限定、采样频率选择、数据处理机制设计、数据传输协议和同步对时等关键问题，研发了原型装置并在变电站试点应用，验证了宽频测量技术的可行性。文中研究能够为电力电子化电网提供新的监测手段，保障电网安全稳定、推动新能源大规模应用，同时进一步推动二次设备集成整合，降低变电站建设成本。

Discussion on Wide-frequency Measurement Technology for Power Electronized Power Grid

With the application of high-voltage direct current(HVDC), flexible AC transmission system(FACTS)and large-scale interconnection of new energy, a large number of power electronic equipment are used in power grid. Abundant wide-frequency signals such as interharmonics and high-order harmonics are injected into power grid, which make power grid gradually present the development trend of power electronic. The existing measurement equipment focuses on power frequency signal measurement, and cannot meet the challenge of wide-frequency signal measurement. This paper analyses the present situation of the existing measurement technology from three aspects: the limitation of existing measurement equipment, the limitation of the upgrade and improvement of the phasor measurement unit(PMU)and the limitation of high-frequency signal measurement, pertinently puts forward the overall scheme of the wide-frequency measurement technology, designs its overall structure. The key issues involved in wide-frequency signal range limitation, sampling frequency selection, data processing mechanism design, data transmission protocol and synchronization are discussed. A prototype device is developed and applied in substation, which verifies the feasibility of wide-frequency measurement technology. The research can provide a new monitoring means for the power electronized power grid, ensure the security and stability of power grid, promote the large-scale application of new energy, and further promote the integration of secondary equipment, reduce the cost of substation construction.