Design Of A Soft-switching System Based On Single-phase Inverter Power

With the more and more large scale of the electrical power system and themore and more complex structures, the troubles become more obvious. Thethree-phase imbalance is one of the troubles.Not only the serious three-phase imbalance will increase the cost of thecompanies, but it also will affect the stability of the loads. The three-phase imbalancecan cause trip among the largest three phases, and it can damage the loads in dailylife. It will bring inconvenience to the produce and life.Existing technology are almost from the grid side to solve the three-phaseimbalance through the study at home and abroad. This article is from the loads sideto solve the problem. According to the power of every phase and loads to adjust thesupply power dynamically and decide which loads need to be switched. This methodcan ensure three-phase balance.This article designs a soft-switching system based on single-phase inverterpower to adjust the supply power. Firstly, the parts of this system are analyzed, andit uses better control strategy to enhance the output of the inverter. Then it providesrobust theory basis for the soft-switch system through analyzing the impulse currentof different loads, and find the way to control the impulse current in the end.The combination of DSP and relays is adopted to make the soft-switch systemrealize automation control. It takes long time to test the feasibility and reliability ofthis system. This soft-switch device is able to achieve stable switching through theinitial experimental verification. The current of loads is stable. There is no currentfluctuation through observing the scope, and the loads “can’t feel” the switch process.At the same time, the device is safe. It proves that the project proposed by this articleis feasible.