一种新型级联多电平动态电压恢复器的研究

Research on a New Cascaded Multilevel Dynamic Voltage Restorer

动态电压恢复器(DVR)是一种电压型电能质量补偿装置,串联在电网和负载之间,用于保障负载侧的电能质量。提出了一种新型级联多电平DVR,两个H桥功率单元级联构成一个逆变单元,并依靠整流电路给逆变单元直流侧电容器提供能量。装置采用电容器耦合方式串入电网,选用数字信号处理器(DSP)、现场可编程门阵列(FPGA)和复杂可编程逻辑器件(CPLD)构成控制系统。进行了详细的硬件和软件设计,实际运行测试结果表明,该级联多电平DVR响应速度快,能够迅速、有效地产生补偿电压,保证了负载侧的用电质量。

Dynamic Voltage Restorer （DVR） is a voltage power quality compensator device which is connected in series between grid and load in order to protect the power quality of load side. A new type of cascade multi-level DVR is proposed in this paper. Two H-bridge power unit cascade constitute an inverter unit, which depends on rectifier circuit providing energy to inverter unit DC side capacitor. Capacitor coupling is used to string into the power grid in device. Digital signal processor （DSP）, field programmable gate array （FPGA） and complex programmable logic device （CPLD） are chosen to constitute control system. A detailed hardware and software design is carried out. The actual running test results show that the cascade multilevel DVR has fast response, can generate compensation voltage quickly and efficiently, and ensure electric quality of side load.