基于阻抗特性多项式拟合的直驱风电机组次同步振荡稳定判据
摘要：近年来，阻抗分析法已成为分析新能源发电并网系统稳定性问题的一种主要研究方法。以直驱风电机组并网系统为例，分析了现有的奈奎斯特（Nyquist）稳定判据的特点和适用范围。为了弥补现有阻抗稳定判据的不足，提出了一种基于阻抗特性分式多项式函数拟合的量化稳定判据，采用分式多项式函数等效拟合理论推导或实测的风电机组端口阻抗特性，在拟合频段内分式多项式与原阻抗特性等价。通过求取拟合多项式零点获得了系统振荡频率和阻尼水平，量化分析了系统稳定特性，拓展了阻抗稳定判据的适用范围。最后，通过理论分析和时域仿真验证了分式多项式拟合判据的正确性和有效性。
Abstract:Impedance analysis is the leading method of solving the stability issues of grid-connected renewable energy generation systems. Taking the grid-connected system of direct drive permanent magnet synchronous generator (D-PMSG) as an example, the characteristics and application scope of the existing Nyquist stability criterion were analyzed. In order to make up for the deficiency of the existing impedance stability criterion, a quantitative stability criterion based on the fitting of fractional polynomial function of impedance characteristic was proposed, which applied port impedance characteristics of wind turbine derived or measured by equivalent fitting theory of fractional polynomial function. Within the fitting frequency band, the fractional polynomial was equivalent to original impedance characteristic. The oscillation frequency and the damping level of the given system were calculated by finding the zero point of fitting polynomial, which could analyze quantitatively the stability characteristics of the system. Finally, the correctness and effectiveness of the fractional polynomial fitting criterion were verified by theoretical analysis and time domain simulation.
标题：基于阻抗特性多项式拟合的直驱风电机组次同步振荡稳定判据
title:Stability Criterion of Subsynchronous Oscillation of Direct Drive Permanent Magnet Synchronous Generator Based on Impedance Polynomial Fitting
作者：于永军,王利超,张明远,肖仕武,张馨元
authors:Yongjun YU,Lichao WANG,Mingyuan ZHANG,Shiwu XIAO,Xinyuan ZHANG
关键词：直驱风电机组(D-PMSG),序阻抗特性,多项式拟合,次/超同步振荡,稳定判据,
keywords:direct drive permanent magnet synchronous generator (D-PMSG),sequence impedance characteristic,polynomial fitting,sub/super-synchronous oscillation,stability criterion,
发表日期：2020-08-31
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