d-q axis decoupling parameter identification strategy for the grid-connected inverter of photovoltaic generation system

摘要：

　　This paper presents a parameter identification strategy based on the d-q axis decoupling for a typical PV inverter,which contains double loop control model.This strategy can reduce the order of the model and improve the accuracy of the identification.Firstly,a typical PV grid-connected system model is built up,in which the inverter controller is based on the d-q axis decoupling current control.Its a double loop control including the outer voltage loop and the inner current loop,and the maximum power point tracking (MPPT).Secondly,we take the system as a research object,deduce the decoupling characteristics of the d-q axis parameters of the inverter controller through theoretical calculation,and reduce the order of the inverter model.Lastly,we get disturbance data through the simulation of control target reference step,and identify the parameters with the nonlinear damped least square method.The experimental results show that: the error is less than 5% in the dominant parameters of the inverter model,which proves the correctness and validity of the identification strategy.

关键词： photovoltaic system inverter the d-q axis parameters decoupling parameters identification the nonlinear damped least square method

作者: Xinwei SHEN Jinghong ZHENG Shouzhen ZHU Lian Shu

作者单位: Department of Engineering,Tsinghua University-China Department of Electrical Engineering,Tsinghua University-China Institute of Electrical and New Electrical Energy,Three Gorges University China

会议类型: 国际会议

会议名称: 第五届中国国际供电会议(GIRED)

会议地点: 上海

会议语种:英文

页码: 1-4

在线出版日期: 2012-09-05（万方平台首次上网日期，不代表论文的发表时间）