光伏微逆变器中Boost变换器的混沌现象分析与控制研究

摘要

On account of the chaotic phenomena exists in Boost converter of photovoltaic micro-inverter, which is easy to make micro-grid unstable. The production mechanism of chaotic phenomena is analyzed by Boost converter modeling after two-stage micro-inverter is proposed, and reference current parameter is a key factor to effect chaos on the converter. A chaos dynamic control method for Boost converter which is based on the method of resonant parametric perturbation is put forward. The reference current is taken as perturbation parameter, and the expression of the optimal control is deduced. The method of resonant parametric perturbation is available to restrain chaotic phenomena on Boost converter by instance verification. Then the results demonstrate that the presented control strategy is effective and feasible to the study of photovoltaic micro-inverter.%由于光伏并网微逆变器中Boost变换器存在着混沌现象，易造成微电网系统的不稳定。故引入两级式微逆变器，通过建立Boost变换器模型分析混沌现象产生机理，参考电流参数是造成混沌的重要因素。提出一种基于参数共振微扰法的Boost变换器混沌动力学控制方法，以参考电流作为微扰参数，推导出最优控制计算公式。通过实例验证，参数共振微扰法可以有效抑制 Boost变换器的混沌现象。结果表明该控制算法对研究光伏微逆变器具有有效性和可行性。