长春高寒地区户外级联逆变器电容电压平衡控制方法  

Capacitance Voltage Balance Control Method of Outdoor Cascaded Inverter in Changchun Alpine Region

作　　者：邢顺涛[1] Xing Shuntao(Changchun Institute of Technology,Changchun 130000,China)

机构地区：[1]长春工程学院,长春130000

出　　处：《科技通报》2017年第2期69-72,共4页Bulletin of Science and Technology

摘　　要：光伏系统中应用范围最为广泛的就是级联逆变器,而级联逆变器的难点问题则是对直流侧电容电压的稳定控制。文中以长春高寒地区户外级联逆变器为研究对象,采用基于载波移相技术结合电压内外环的控制方法,对多电平逆变器实现电容电压平衡控制。首先,构建基于单相级联逆变器系统数学模型,主要分析系统本身损耗、各桥电压参数、电路电阻参数及调控电压信号参数对级联逆变器电容电压形成的不平衡效果;然后,针对上述模型提供的数据制定直流侧电容电压平衡稳定调控策略,使误差值转化为正弦函数后附加于各桥调制信号上,通过载波移相控制技术减弱谐波,在跟踪输出电流时结合电压内外双环控制技术进行级联逆变器电容电压调控,最终实现电容电压稳定控制。仿真实验证明,运用此种调控策略,使各桥之间电压电流达到平衡,实现稳定控制的目的。The most widely used in photovoltaic systems is the cascade inverter, and the cascade inverter difficult problem is the DC side capacitor voltage stability control. Taking the outdoor cascade inverter in Changchun alpine region as the research object, this paper adopts the control method based on the carrier phase-shifting technique and the voltage inner and outer loop to realize the capacitor voltage balance control for the multi-level inverters. Firstly, the mathematical model of single-phase cascade inverter system is built, and the imbalance effect of the system's loss, bridge voltage parameter, circuit resistance parameter and voltage signal parameter on the capacitor voltage of cascaded inverter is analyzed. In order to reduce the harmonics of carrier- wave phase- shifting control technology, it is necessary to combine the internal and external voltage to track the output current when the output voltage is controlled by the carrier- wave phase- shifting control technique. Double- loop control technology cascade inverter capacitor voltage control, the ultimate realization of the capacitor voltage stability control. The simulation results show that the control strategy can balance the voltage and current between the bridges and achieve the purpose of stability control.

关 键 词：高寒地区 级联逆变器 电容电压平衡控制 

分 类 号：TM464[电气工程—电器]