双降压式光伏逆变器的电流滞环控制

Dual Buck PV Inverter Based on Current Hysteresis Control

逆变器是光伏发电系统的核心设备之一,为提高逆变器的可靠性和稳定性,获得比较理想的正弦输出电压,优化逆变器的性能,研究了一种新颖的双降压式光伏逆变器。对DC/AC逆变器的构成原理,控制方案等进行了研究。在控制上,采用定环宽两态调节的滞环电流控制策略。深入分析了两态滞环电流控制的逆变器的工作原理,给出了逆变器的输入输出关系,阐述了所采用的双环控制的电流滞环控制基本设计方法。Matlab软件仿真表明,控制策略简单、有效,使用该控制方法的系统具有良好的稳态和动态特性,输出电压波形好,具有一定的实用价值。

The inverter is one of the core equipment in a photovohaic system. To improve the reliability and stability of the inverter, to obtain an ideal sinusoidal output voltage and to optimize the performance of the inverter, a novel two-buck P~ inverter is proposed in this paper. The DC / AC inverter principle and the control scheme are discussed. The fixed-width two-state ring adjustable hysteresis current control strategy is adopted. The paper gives an in-depth analysis of a two-state hysteresis current control of inverter, the inverter input-output relationship, the use of the double-loop control of the basic design of hysteresis current control method. Matlab simulations show that the control strategy is simple, arid the effective use of the control system will bring about a good steady-state and the dynamic characteristics of the output voltage waveform are good, which would enjoy a practical value.