Design And Application Of Single-phase And Three-phase Energy Storage Inverter Based On DSP28335

With the rapid development of economy these years, international energy consumption is rising sharply. The extensive economy growth mode through increase the consumption of energy has caused a severe decline in environmental quality of the global atmosphere, soil and water source. Since the traditional energy is being exhausted, distributed generation technology becomes a research focus. Compared with the traditional way of power generation, the advantages of distributed generation are multiple energy utilizations, environmentally friendly, high power generation efficiency and economical. The photovoltaic, wind machines and other equipment in microgrid can be affected by meteorological factors, therefore the output power is intermittent and fluctuant, which brings non-ignorable negative effect to the power grid and load. Therefore the energy storage system should be installed in microgrid, for sake of power fluctuations restrain, inertia increase and the ability of disturbance resistance improvement. The energy storage inverter is the core for carrying out the peak load leveling and restraining power fluctuations in microgrid. The success of energy storage inverter development with high-performance and multi-function has an important practical significant.This paper introduces the design scheme of inverter hardware and software platform firstly. The hardware circuit diagrams, layered software frameworks and PC debug interface are presented. Then the design method of single-phase and three-phase energy storage inverter is given in the paper. The main circuit structure, phase locking algorithm and control strategies are designed referring to basic technical parameters of energy storage inverter. The testing prototypes are developed based on the hardware and software platform. The reliability of the testing prototypes has been proved through experimental waveforms. Furthermore, the parallel control method of multiple energy storage inverters is presented in this paper. Using CAN bus for the judgment of master and slave unit, energy storage inverters operate with different control strategies. Based on this method, the microgrid system can keep functioning normally even if any inverter is out of operation. The experimental platform for parallel inverters is built for testing and the feasibility of the control strategy has been proved finally.