RSC扰动分量与转差频率耦合引起的DFIG定子间谐波电流解析模型

发布时间：2019-04-13 15:31

【摘要】：研究双馈风机(double fed induction generator,DFIG)的间谐波产生机理和传变规律对于分析风电的次同步振荡和电能质量问题兼具理论必要性和工程迫切性。为此,文章考虑转子侧变流器(rotor side converter,RSC)在逆变侧产生的扰动电压分量,根据双馈风机的稳态电压方程和磁链方程,构建了DFIG间谐波等效电路数学模型;通过坐标变换将转子与定子电气量统一于同步速dq旋转坐标系中;然后经推导和坐标反变换建立了RSC扰动分量与转差频率耦合引起的DFIG定子间谐波电流解析模型。在PSCAD平台上搭建双馈风机并网算例,仿真结果验证了该模型的准确性。最后利用该模型进行定量计算,分析了RSC扰动分量在DFIG中的传变规律和感应出的定子间谐波电流随风速变化的时变特性,从而为DFIG中定子间谐波电流的抑制奠定了基础。
[Abstract]:The study of inter-harmonic generation mechanism and transfer law of doubly-fed fan (double fed induction generator,DFIG is of both theoretical necessity and engineering urgency for the analysis of sub-synchronous oscillation and power quality of wind power. Therefore, according to the steady-state voltage equation and flux linkage equation of doubly-fed fan, the mathematical model of DFIG inter-harmonic equivalent circuit is established according to the disturbance voltage component of rotor-side converter (rotor side converter,RSC on the inverter side. The rotor and stator electric volume are unified in the synchronous speed dq rotating coordinate system by coordinate transformation, and then the analytical model of DFIG inter-stator harmonic current caused by coupling of RSC disturbance component and slip frequency is established by derivation and inverse coordinate transformation. A grid-connected doubly-fed fan is built on the PSCAD platform, and the simulation results verify the accuracy of the model. Finally, the quantitative calculation of RSC disturbance component in DFIG and the time-varying characteristics of induced stator inter-harmonic current with wind speed are analyzed, which lays a foundation for the suppression of stator inter-harmonic current in DFIG.
【作者单位】：新能源电力系统重点国家实验室(华北电力大学);国家电力调度控制中心;
【基金】：国家电网公司科技项目(SGTYHT/14-JS-188)~~
【分类号】：TM614

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