电力系统及其自动化学报2017，Vol.29Issue(12)：48-54,62,8.DOI:10.3969/j.issn.1003-8930.2017.12.008
基于Cp函数初值模型的并网DFIG稳定性分析
Stability Analysis of Grid-integrated DFIG Based on Initialization Model with CpFunction
摘要
Abstract
The initialization model of doubly-fed induction generator(DFIG)affects the credibility of the stability analy-sis result of grid-integrated DFIG.The existing constant mechanical power(Pwt)model does not consider the influence of rotation speed change on the mechanical power,while the constant optimal power coefficient(kopt)model cannot be applied under the derating state operation conditions such as speed limit and pitch angle regulation.In this paper,a sta-bility analysis model of grid-integrated DFIG based on wind utilization coefficient(Cp)function is proposed,in which wind speed,rotation speed and pitch angle are set as controlled variables.In this way,the solution of an initialization model of DFIG and the small/large disturbance stability analyses are realized at different rotor speeds,power dispatches and pitch angles.The stability analysis result obtained by the Cpmodel is compared with those from the constant Pwtand constant koptmodels to analyze the errors of the existing models. It is found that for the constant Pwtand constant kopt models,the error of mechanical power will lead to the errors of initial rotation speeds under the derating state operation and reduce the precision of the rotation speed and terminal power obtained by dynamic simulations under large disturbances.Moreover,the error of mechanical torque will also affect the result of small disturbance stability analysis.关键词
双馈异步风电机组/Cp函数/初值模型/特征值分析/风速扰动/电压跌落/稳定性Key words
doubly-fed induction generator(DFIG)/Cp function/initialization model/eigenvalue analysis/wind speeddisturbance/voltage drop/stability分类
信息技术与安全科学引用本文复制引用
李生虎,黄杰杰,石雪梅,王杰..基于Cp函数初值模型的并网DFIG稳定性分析[J].电力系统及其自动化学报,2017,29(12):48-54,62,8.基金项目
国家自然科学基金资助项目(51277049) （51277049）
