电力系统自动化2017，Vol.41Issue(20)：47-54,125,9.DOI:10.7500/AEPS20170225006
电网对称故障下双馈风力发电机的虚拟同步控制策略
Virtual Synchronous Control Strategy for Doubly-fed Induction Generator Wind Turbines Under Symmetrical Grid Faults
摘要
Abstract
The virtual synchronous control strategy for the doubly-fed induction generator (DFIG) is a promising control technique to provide inertial frequency and voltage support when DFIG is integrated to the power grid.However,the existing virtual synchronous control strategy for DFIG mainly focuses on mimicking the electromechanical dynamic behavior of the synchronous generator,while neglecting the electromagnetic transient responses of DFIG.Firstly,the electromagnetic transient characteristics of virtual synchronous control-based DFIG during symmetrical grid faults are analyzed.Two severe flaws of existing virtual synchronous control strategy are revealed,that is,the incapability of fully imitating the transient characteristics of synchronous generators,or limiting the overcurrent in DFIG rotor.Then,a transient voltage compensation virtual synchronous control strategy for DFIG is proposed.The main principle is compensating for the transient component of the control voltage of rotor side converter to weaken the influence of transient electromotive force in rotor windings to suppress the overcurrent in DFIG rotor.Finally,a simulation analysis is made to compare the performances of existing and proposed virtual synchronous control strategies to show that the proposed virtual synchronous control strategy can not only enhance the advantage of providing inertial support,but also effectively limit the overcurrent in DFIG rotor and the oscillations of electromagnetic torque,with the capability to offer reactive power support to power grid.All of these improve the possibility for DFIG to implement fault ride through and the ability of power system to recover from grid faults.关键词
双馈风力发电机/虚拟同步控制/电网对称故障/转子过电流抑制/暂态电压补偿Key words
doubly-fed induction generator wind turbines/virtual synchronous control/symmetrical grid faults/limitation of overcurrent in rotor/transient voltage compensation引用本文复制引用
程雪坤,孙旭东,柴建云,赵杨阳..电网对称故障下双馈风力发电机的虚拟同步控制策略[J].电力系统自动化,2017,41(20):47-54,125,9.基金项目
国家自然科学基金资助项目(U1510208).This work is supported by National Natural Science Foundation of China (No.U1510208). （U1510208）
