风电、光伏、储能、柔性高压直流输电等通过电压源/电流源型变流器接口取代了传统的机械开关并网,将给电力系统的既有频率动态特性、有功平衡原理及相关控制方法带来改变.首先回顾了近年电力电子接口相关的系统频率事件,从惯量角度分析了规模化电力电子接口对系统频率控制的影响.总结了提高频率支撑能力的接口控制技术,分析了接口外特性在惯性响应和一次调频环节与同步机组等价性.基于能量守恒原理讨论了大规模电力电子接口接入下电力系统有功平衡机理,最后从机理、模型、方法层面提出了电力电子化该领域内值得探索问题.%Devices such as wind turbines,solar power,and flexible high voltage direct current (HVDC) transmission are connected into power system via voltage or current source converters,which bring changes to system frequency dynamics,power balance principle and control methods.Recent frequency events are reviewed first.Then impacts on system frequency control of large-scale power electronic interface are analyzed in aspect of system inertia.Interface control technology that is engaged in improving frequency support capability are summarized,and degree of equivalence of external characteristics between electronic interface and synchronous generators are analyzed based on inertia response and primary frequency control.Power frequency balance based on law of conservation and conversion of energy in power system with large-scale electronic interfaces are discussed.Finally,some questions worthy of exploration in terms of principles,models and methods are proposed.
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