This project belongs to the field of power electronics technology in the discipline of electrical engineering. With the rapid development of new energy power generation, energy storage, electric vehicles and microgrids, due to the low DC voltage generated by a single power supply during the power conversion process, a DC boost converter needs to be added at the front end of the system to increase the low voltage for application. Common methods include: adopting a large duty cycle in traditional step-up DC converters, using multi-level connections, transformers and coupled inductors; this brings a series of problems in the power conversion process: conduction loss increases, current ripple increases, high-frequency oscillations occur, switching voltage spikes and EMI are generated, the main circuit topology is complex, control difficulty is increased, conversion efficiency is reduced, manufacturing costs are increased, etc. The above-mentioned problems have put forward requirements for current DC switching converters to be miniaturized, lightweight, high performance and high reliability. This project provides single-stage high-gain DC conversion technology for the system by studying the topology and control strategy of high-gain DC converter, which can effectively improve conversion efficiency, improve reliability, reduce size and reduce costs. The key technical inventions of this project are as follows: 1) A DC boost converter with high gain and low switching stress. By inventing and utilizing an X-type Z-source network and a simple series and parallel connection method of inductors and capacitors, the circuit topologies of a single-stage DC converter and a two-stage converter are respectively realized. Not only can higher voltage conversion gain be obtained, but also the voltage stress applied to both ends of the main switch is reduced, the peak value of the input current is reduced, and the conduction loss is reduced, effectively achieving the DC converter's high efficiency, small size, low noise, and low cost application goal. (Patent: ZL201410235430.1) 2) Voltage doubling DC converter based on charge pump capacitor. Through the invention and using the charge pump capacitor to connect the diode and the inductor, the conduction duty cycle of the switch is effectively reduced, thereby reducing the conduction loss; the peak value of the input current and the ripple of the output voltage are effectively reduced with the shortening of the conduction time, and the voltage stress of the main switch is reduced accordingly, and the requirements for the withstand voltage level of the switching device are reduced, thereby reducing the cost. It has the advantages of increased voltage gain, small conduction loss, cost, and simple circuit structure. (Patent: ZL201310032032.5) 3) Zero-voltage switching quasi-resonant high-gain DC boost converter. By increasing the soft switching conditions of the LC resonant circuit, the switching environment of the circuit in which the device is located is improved. Resonance slows down the rate of change of voltage and current during the switching process. In terms of input and output power under hard switching conditions, the loss under soft switching conditions is small and the circuit transmission efficiency is higher; the circuit topology is simple, which can meet the requirements of simplicity, efficiency, lightweight and low noise. (Patent: ZL201510639813.X) The project has obtained 7 authorized invention patents, 3 utility models, 1 appearance patent, 2 public invention patents, and published 26 SCI/EI papers. According to SCI search and EI search statistics, it has been cited many times in the top journals of power electronics, IEEE Transactions on industry electronics, Electronics Letters, etc. This project has been successfully applied in energy storage inverters, photovoltaic micro inverters, solar power generation systems and reactive power compensators. It has been applied in energy storage power stations, photovoltaic power station demonstration projects, and power generation poverty alleviation projects. The new output value of the cooperative units is 113.8 million yuan, and the new profit is 16.995 million yuan, which has generated great economic benefits and good social benefits. After novelty evaluation by the Shanghai Science and Technology Information Center of China Academy of Sciences, the project is novel and its comprehensive technology has reached the domestic leading level.