光伏并网逆变器控制参数的dq 轴解耦辨识策略

A dq Axis Decoupling Parameter Identification Strategy for Grid-connected Inverter Controller of Photovoltaic Generation System

光伏并网逆变器对光伏发电系统的动态特性具有决定性作用,因此获得准确的光伏逆变器控制参数是分析光伏发电系统并网影响的基础。提出了一种针对典型光伏并网逆变器双环控制模型的dq轴参数解耦辨识策略,并通过仿真算例比较了解耦模型在不同噪声水平下的辨识效果,分析了不同类型的扰动数据对辨识的影响规律,讨论了滤波电感参数有偏差时对辨识结果的影响,最后通过参数适用性检验算例验证了所提出辨识方法的有效性。

The controller of grid-connected inverter plays a decisive role in the transient characteristics of the photovoltaic（PV） system.Therefore,the accuracy of the controller parameters is quite important in the analysis of PV system impact on the power system.This paper presents a dq axis decoupling parameter identification strategy for a typical PV inverter,which contains double loop control model.Furthermore,the parameter identification effects are compared,in terms of the impact of different levels of noise and different types of disturbances.In addition,the impact of the filter inductance error on the identification is discussed.Finally,the validity of the identification strategy is proved by case studies.