Research An A Hybrid Impedance Source Inverter

With the shortage of energy and the increasingly serious environmental pollution,there is an urgent need to replace traditional fossil energy with renewable,clean new energy sources such as solar energy.The problem of how to to achieve high effciency when we transform voltage level has become an important research direction for scholars at home and abroad in the field of new energy power generation.As a kind of single-stage inverter which has high power conversion efficiency by its simple structure,has received close attention and research.The impedance source inverter can realize the boosting function while completing the invert.Based on a novel T? impedance source network proposed in this paper,a new inverter-T? hybrid impedance source inverter is proposed which is combined with a quasi-Z source inverter(q ZSI).The inverter combines the dual advantages of the impedance network and the quasi-Z source inverter(q ZSI),allowing the shoot-through state to occur,the input current is continuous,the structure is simple,and the failure rate is low.The addition of the coupled inductor module enables the inverter to achieve a two-degree-of-freedom adjustment,namely,the duty cycle and the coupled inductor turns ratio,which can achieve high voltage gain at a lower duty cycle and a larger modulation factor M.In this paper,the evolution process of the T? hybrid impedance source inverter is described in detail,and the steady state analysis and theoretical performance analysis of the working principle are carried out.The steady state analysis and theoretical performance analysis of the working principle are carried out.The boosting factor,voltage and current stress of key components and energy conversion relationship of various parts of the circuit are derived.The effects of parasitic parameters of the device on circuit performance and work efficiency are studied,which provides a theoretical basis for system performance optimization.On this basis,a small-signal model is established,and a PID controller with good control performance is designed to achieve stable closed-loop control of DC link voltage and output voltage.The theoretical analysis and simulation verification of the object of this paper were carried out by using Saber.The experimental results were verified by establishing a 1k W experimental prototype in the laboratory.The experimental results are in agreement with the theoretical research,which proves the effectiveness and practicality of the proposed new inverter.