Research And Implementation For Off-grid Wind Power Single-phase Inverter

This topic is an important part of new energy such as small wind power energy from generation to take advantage. Its function is to generate the AC voltage available for the user by the modulation technology boost and inverter through the low voltage DC power produced by renewable energy.The difference between off grid wind power and grid-connected wind power is that off-grid wind power generated electricity do not need to be connected to the public grid, the generated electricity is stored in the memory unit, after the inverter power supply for the user. In short, when there is no energy input, battery power can be change into AC power for use by the inverter. Grid-connected inverter is no battery, if there is enough energy, it can connect to the grid.Inverter is a very important part of off-grid wind power. This topic has two important parts, one is the boost, and the other is the inverter. The12V DC will be boost to about400V DC, and though inverter, under the SPWM, we can achieve the220AC.The Inverter has two parts, one is power circuit, and the other is control circuit. The power circuit includes auxiliary power, push-pull boost, high voltage rectifier, and inverter, etc... The control circuit includes boost control and inverter control. There are two controllers in the controls circuit. The communication between the two parts can be finished by optical coupling.The controller PIC16F684finishes push-pull and battery voltage detection. The controller STM32F107producted by ARM can finish the work of voltage detection and circuit detection. The STM controller has good cost performance and handling and it is cheaper than DSP, but it performance is not bad. It is a good choose to finish control and calculation.The controller has good protection such as battery undervoltage protection, high-voltage overvoltage protection, output over-current protection and so on. These protections can insure the equipment safe when any faults happened by seal off the wave.Experimental proof that the inverter has good stability and high efficiency, and it can achiece the inverter function very well and it has widly used areas.