风电机组的自同步电压源控制研究综述

Review of Self-synchronous Voltage Source Control for Wind Turbine Generator

电力系统正朝着高比例新能源和高比例电力电子装置的“双高”特征方向发展,电压源风电机组具备建立电压、自主快速支撑电网电压和频率的能力,有助于“双高”电力系统的安全稳定运行,为“双高”电力系统的构建提供了一种可能的电源侧解决方案。文章依照电压源控制方法发展的脉络,首先阐述了并网变换器的电压源控制方法,进而针对风电变流器的双变换器特征,总结了电压源控制在两种主流风电机组中的应用,包括稳态频率响应和电网故障下的限流控制及暂态电压支撑等,给出了风电机组自同步电压源技术的现状。最后,对电压源风电机组大规模应用面临的技术挑战进行了展望,指出了技术攻关的方向。

The power system is developing in the direction of“double high”characteristics,which is represented by a high proportion of renewable energy sources and a high proportion of power electronics.Voltage source controlled wind turbine generators(WTGs)have the ability of establishing voltage and supporting the grid voltage and frequency independently and quickly,which contribute to the safe and stable operation of the“double high”power system.Therefore,this paper provides a possible power-side solution for the construction of“double high”power systems.In accordance with the development of voltage source control methods,this paper firstly describes the voltage source control methods for grid-side converters.Then,according to the dual-converter characteristics of WTGs,the applications of voltage source control methods in two mainstream WTGs are summarized,including steady-state frequency response and current-limiting control and transient voltage support under grid faults.And the current status of research on self-synchronization voltage source technology for WTGs are given.Finally,the technical challenges that we will face in the large-scale application of voltage source controlled WTGs are put forward,and the direction of technical research is pointed out.