Bipolar-type Dynamic Voltage Conditioner Using P-Leg and N-Leg Structured AC-AC Converter
The voltage fluctuation caused by the high proportion of residential photovoltaic (PV) grid-connected not only restricts the capacity of network to absorb renewable energy, but also seriously affects the normal operation of electrical equipment.Voltage problems in the low voltage distribution network with high proportion of residential PV are described and a novel bipolar-type dynamic voltage conditioner (B-DVC) is introduced to solve the voltage problem in this paper.The topology of the B-DVC adopts the positive current leg (P-Leg) and the negative current leg (N-Leg).By combining two separation inductors together, the voltage distortion caused by the traditional full-bridge two-way switch converter is overcome.Due to the use of the P-Leg and N-Leg structure,the B-DVC can be short-and open-circuited without damaging the switching devices.Neither lossy RC snubber nor a dedicated soft commutation strategy is required in the proposed B-DVC.Furthermore, B-DVC can not only output the voltage with the same polarity as the grid voltage, but also output the voltage opposite the polarity, which can ensure the stability of the power grid voltage and improve the capacity of grid to absorb renewable energy.A 10-kW prototype of single-phase B-DVC is developed, and its performance is experimentally verified.
Residential photovoltaic Voltage fluctuation B-DVC P-Leg and N-Leg Commutation problem
Yue-yue LI Dong-bo GUO Yi-bo WANG Yu MA Han-wen ZHANG
State Grid Shenyang Electric Power Supply Company, China School of Electrical Engineering, Northeast Electric Power University, China
国际会议
上海
英文
74-81
2018-04-15（万方平台首次上网日期，不代表论文的发表时间）