Three-phase Of The Micro-grid And Grid-connected Inverter Hardware Research And Design,

The power of micro grid is usually composed of multiple distributed generation equipment or storage device through the network power transformation, the other supply power unit has the characteristics of dispersed and inconsistent. No matter what kind of distributed generation or energy storage devices, will eventually be available to users directly into the exchange network, so it must to ensure the safe and efficient electrical energy to feed the grid after a series of energy transformation. Three-phase inverter is one of the key components of the grid. The Micro grid operation management system unified control operation management.Firstly, this paper introduces the micro grid and the concepts and features of various distributed micro power grids. Then the function and structure of the three-phase inverter are introduced, which has three parts: the main power circuit section, the control circuit based on TMS320LF2812 and three-phase full-bridge inverter control strategy.The main power circuit is divided into two grades: the proceeding stage of DC-DC transformation and the backward stage DC-AC inverter three-phase in accordance with the energy transformation process. It also introduces the main switching device selection, drive circuit and protection circuit, and the other circuit components and parameters selection in detail, according to the power design.The control circuit based on the TMS320LF2812 is mainly divided into two parts: the general TMS320LF2812 minimum work system and the interface circuit for the whole bridge three-phase inverter control chip. The minimum work system includes system power, crystals, serial port and so on. The interface circuit includes the SPWM control signal amplifier circuit, and power quality sampling circuit. It is chiefly on the sample of the exchange power, which introduces the design of the signal conditioning circuit based on a six-channel simultaneous sampling ADS7864 chip.This paper compares the common inverter control schemes and supposes the control strategy of this system, and also introduces the software design combined the structure features of TMS320LF2812 chip. Finally, the article carries out the related simulation and test. Through the simulation and test, the results verify the correctness of this design.