两级式单相光伏并网逆变器输入电压PI+QPR鲁棒控制器设计  

Design of Input Voltage Robust PI+QPR Controller for Two-Stage Single-Phase PV Grid-Connected Inverter

作　　者：候虚虚 秦岭[1] 茅靖峰[1] 王亚芳[1] 罗松[1] 冯志强[1] 

机构地区：[1]南通大学电气工程学院,江苏省南通市226019

出　　处：《电网技术》2017年第9期2910-2918,共9页Power System Technology

基　　金：江苏省研究生科研创新计划项目(YKC16003);江苏省自然科学基金项目(BK20141238);南通市应用基础研究项目(GY12015007)~~

摘　　要：为了提高MPPT效率,必须抑制两级式单相光伏并网逆变器系统输入电压的低频纹波分量。深入研究了基于PI级联准比例谐振(PI+QPR)控制器的纹波抑制策略,给出了具备纹波鲁棒抑制能力的电压控制器设计准则和设计方法。首先建立了两级式单相光伏并网逆变器输入电压低频纹波分量抑制分析的数学模型;然后,以前置电容式Boost变换器为例,分析了纹波抑制条件以及环境因素对该条件的影响;在此基础上,推导出具有低频纹波鲁棒抑制能力的输入电压控制器参数设计准则;给出了PI+QPR控制器的解耦设计方法,使得PI控制器负责系统的鲁棒稳定性,而基于纹波鲁棒抑制条件设计QPR控制器参数,从而确保系统兼具鲁棒稳定和低频纹波鲁棒抑制能力;最后,通过200V·A的样机仿真验证了理论分析的正确性和可行性。To improve MPPT efficiency, it is necessary to suppress input voltage ripple component of two-stage single-phase photovoltaic（PV） grid-connected inverter. This paper thoroughly studies low frequency ripple suppression strategy based on PI cascade quasi-proportional resonant（PI＋QPR） controller. Design criteria and methods of voltage controller with robust ripple rejection capability are also presented. Mathematical model of input voltage ripple component analysis is established at first. Then, taking Boost converter with input capacitor as an example, ripple rejection condition and effect of environmental factors on this condition are analyzed. Based on these, parameter design criteria of input voltage controller with low frequency ripple robust rejection capability are derived. This paper also gives decoupling design method of PI＋QPR controller to ensure robust stability. QPR controller parameters are determined by the ripple robust suppression condition. As a result, the system has both robust stability and low frequency ripple robust rejection capability. Correctness of theoretical analysis is verified by simulation result of a 200 VA prototype.

关 键 词：光伏并网逆变器 纹波抑制 音频敏感系数 鲁棒 QPR控制器 

分 类 号：TM72[电气工程—电力系统及自动化]