Research On Three-level T-Type Inverter Based On Battery Storage

With the improvement of industrial technology and economy of my country, it has alsobrought problems such as energy shortage and environmental pollution to our country, thosepotential problems of the traditional centralized grid,such as high costs, the difficulty of operationand maintenance, the poor security and reliability are becoming more severe.In order to solve theproblem,the utilization of distributed generation can convert the renewable energy to grid, it hasthe advantage of low pollution, high efficiency,as wind energy and solar energy have thecharacteristics of random fluctuations and intermittent, their large-scale connections to grid willbring some problems which jeopardize the steadiness and safety of grid.It can solve the problem effectively by Battery energy storage system,when it is connected tothe grid,it can the power grid peak,so it can control the quality of electric energy and can make thesystem more reliable power supply,power storage is a common way of energy storage, whichcontains the advantages of good characteristic, high energy density, environmental-friendly and soon.Compared with the NPC three-level inverter,because of low press levels and switching lossesand harmonic content,in high-pressure situations three-level inverter power,devices have beenwidely applied.Multi-module parallel operation technology is a key technology to the powerconverter development,so it is been widely used.This paper mainly do the following aspects of the study.(1)The topology of the inverter and battery energy storage system are reviewed in thispaper,do some analysis of the working principle of three-level T-Type inverter,and theestablishment of the mathematical model of grid connected inverter and the control strategy ofit,we also do research of the svpwm and the design of current loop controller,at the end,the gridconnected inverter is verified by simulation.(2)We do some study on the causes of loss and loss and three-level T-Typeinverter of calculation formula,at the end,and we do some analysis of the neutral pointvoltage three-level T-Type inverterl grid unbalance control,it verified by simulation.(3)At the bottom of the research on three-level T-Type inverter,the modular parallel werestudied,we introduce the parallel inverter and its topological structure,and then introducesthe parallel inverter control method.At the end,the grid connected inverter parallel system based on master-slave control method is verified by simulation.(4)An experimental platform is built on three-level T-Type inverter gridconnected inverter,and then this paper introduces the structure and the structure of maincircuit control circuit and the software design of the flow chart,in the prototype platform,it verifythe battery energy storage performance of the energy conversion system,as a result,the system isfeasible and effective.