Research on Grid Connected Inverter Based on Parallel Resonance

2018 5th International Conference on Advanced Composite Materials and Manufacturing Engineering

Hong, Bo^1 ; Yuan, Liyue^1 ; Yang, Zhixiong^2 ; Gu, Peng^1 ; Yuan, Shuai^1 ; Li, Jun^1 ; Ma, Aikun^1 ; Wang, Yuting^1

State Grid Liaoyang Electric Power Supply Company, Liaoyang

111000, China^1

Kunming Institute of Physics, Kunming

650223, China^2

关键词: Control strategies;    Dead- time compensation;    Design Principles;    Experimental prototype;    High frequency power;    High-frequency isolation;    Parallel resonance;    Resonance parameters;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/394/4/042010/pdf
DOI  :  10.1088/1757-899X/394/4/042010

来源: IOP

【 摘 要 】

In order to solve the problem of large switching loss, large voltage peak and poor stability in DC-DC transform high frequency isolation inverter, a new inverter circuit topology, which is combined with parallel resonant and traditional DC-DC converter, is proposed. The inverter can realize the zero voltage opening of the high frequency power device, the soft turn off of the body diode and the rectifier diode, so as to eliminate the switch peak of the power device and reduce the loss of the inverter. The working process of the circuit and the soft switching principle of various switch devices are introduced in detail, and the resonant equivalent model of the circuit, the influence of the resonance parameters on the gain and the soft switch are established, and the design principle of the resonant parameters is given. In order to eliminate the low harmonics introduced by dead zone, dead time compensation is added to the control system to improve the quality of inverter current. Finally, an experimental prototype is built, and the correctness of the circuit topology and control strategy is verified by experiments.