摘要
为了削弱三相逆变器因开关死区、开关导通关断延迟等对并网电流的影响,在分析死区效应产生的平均误差电压的基础上,改变传统固定死区时间的设定方法,根据电流幅值自适应调整死区时间,建立了逆变器的死区补偿模型。在不需要进行电流极性检测基础上结合滑模变结构控制方法提出了基于指数趋近律滑模控制方法来设计电流控制器,利用反正切函数替代符号函数抑制了滑模控制所固有的抖振现象,实现了死区补偿和逆变器的鲁棒控制。利用TMS320F2812 DSP芯片实现补偿算法,在10 kW三相并网逆变器样机上验证了死区补偿算法的有效性。
In order to weaken the effect of dead-time and turn on/off delay on the gird-connected current of three-phase converter,the average error voltage caused by dead-time is analyzed,the fixed dead-time is replaced by the dead-time adaptively adjusted according to the amplitude of the current,and a dead-time compensation model is established.Combined with the sliding mode variable structure control,a current controller based on exponent approaching law is designed,which,without current polarity detection,adopts the arctan function instead of the sign function to suppress the chattering intrinsic in traditional sliding mode control and realizes the dead-time compensation and robust control of inverter.The proposed deadtime compensation is implemented with TMS320F2812 DSP chip and its effectiveness is verified with a 10 kW prototype of three-phase grid-connected inverter.
出处
《电力自动化设备》
EI
CSCD
北大核心
2013年第11期9-14,共6页
Electric Power Automation Equipment
关键词
逆变器
死区效应
死区补偿
指数趋近律
滑模控制
electric inverters
dead-time effect
dead-time compensation
exponent approaching law
sliding mode control
