光伏并网逆变器数字滞环控制的研究

Research on Digital Hysteresis Control for Grid-connected PV Inverter

提出一种用于光伏并网发电系统中逆变器的数字滞环控制方法,对其工作原理和实现过程进行了理论分析和实验验证。该方法不同于现有SPWM逆变和直接电流跟踪控制,而是采用同步锁相方法,通过软件实现全数字化的滞环电流控制。该方法具有响应速度快,抗干扰能力强,输出功率因数高,工作可靠等优点,具有实用价值。

A novel method of digital hysteresis current control for grid-connected photovohaic （PV） system is presented in this paper, and the principle and implementation is analyzed in detail.Unlike the traditional SPWM inverter and direct current-tracking control,this controller adopts synchronous phase-lock and achieves full digital hysteresis current control by software.The novel method has the advantages of fast response,intensive anti-interference,high power factor and reliability, and therefore has the value of utility.