三相逆变电源新型解耦控制策略研究

Research on New Decoupling Control Strategy of Three-phase Inverter

摘要:

随着电网环境日益恶劣,逆变电源改善电能质量作用逐渐突显;作为逆变电源的核心,三相逆变器常采用电压电流双闭环控制策略,该方法在设计电流前馈解耦环时需要计算交流侧电感参数值,而在实际应用设计时往往忽略电感参数对系统性能的影响；另外电压环非线性处理也直接影响了控制性能的提升;文中提出一种直接电流无电感参数解耦控制策略,在合成矢量的基础上建立同步旋转d-q坐标系下无电感参数模型,给出单位功率控制电流环控制器PI参数设计;Matlab/simulink仿真结果验证了该方法的正确性及可行性。

Abstract:

With deteriorating of the power grid,power quality improvement by inverter is becoming more and more important. Three-phase inverter,which is the core of inverter,often adopts voltage current double closed-loop control strategy. This method has to calculate AC-side inductor when designing the current feed-forward decoupled ring,but the effect of inductance parameter is often ignored in practical application design. Besides,the no-linear processor of voltage ring has a direct impact on the improvement of the control performance. This paper proposed a decoupling method which is direct current without inductance parameter. Synchronous d-q coordinate non-inductance model is built on the basis of synthesized vectors and PI parameter design of unit power control current ring controller is given. Simulation result of Matlab/simulink verified the validity and feasibility of this method.