单相双Boost并网逆变器的模型预测控制策略

Model Predictive Control for Single-phase Grid-tied Dual Boost Inverter

由于受Boost电路非线性特点的制约,传统基于线性系统理论的双环或者多环控制,往往存在控制环路多、控制结构复杂、控制器参数整定工作困难等缺点。基于模型预测控制理论对非线性系统具有良好的控制效果及鲁棒性强的特点,提出了一种单环并网电流模型预测控制策略。首先,针对双Boost电路组成差分逆变器的电路结构特点,提出了半周期的调制策略,在正负半周期内,实现两个Boost逆变器的解耦控制。接着,提出基于模型预测控制的单电流环并网电流控制策略。研制了750 W双Boost并网逆变器的实验样机,实验验证了双Boost并网逆变器半周期调制策略及模型预测控制策略的可行性与有效性。

Due to the nonlinear restriction of Boost circuit,the traditional double loop or multi-loop control based on linear system theory has many disadvantages,such as many control loops,complex control structure,intricate and difficult controller parameter tuning.Based on the good control effect and robustness of model predictive control for nonlinear systems,a single grid current loop based on model predictive control strategy is proposed.Firstly,a half-cycle modulation strategy is proposed to realize the decoupling control of the two Boost converters in the positive and negative half cycles.Then,a single current loop of grid current control strategy based on model predictive control is proposed.An industrial prototype of 750 W dual Boost grid-tied inverter is developed.Experiments verify the feasibility and effectiveness of half cycle modulation strategy and model predictive control strategy in dual Boost grid-tied inverter.