Design And Realization Of Digital Single-phase Inverter Power Based On Vector Control

In recent years, with the continuous development of power electronics technology, inverter power has been applied in all walks of life and the requirement of inverter power is increasingly stringent. In the application, people always need high quality of output waveform, good dynamic performance and high steady state accuracy. Now the development trend of high-power three-phase power is becoming multiple small single-phase powers in parallel. So there are important research significance and practical value to study single-power with performance of simple structure as well as good dynamic and static characteristics.Various researches on the control of the single-phase inverter has been presented now, such as double-loop feedback control, multi-loop feedback plus feedforward control, repetitive control, sliding mode variable structure. Common to all these single-phase inverters is that they must track a continuously varying (sinusoidal) reference voltage command,and thus will generally exhibit some amount of following error. To solve the problem fundamentally, this thesis follow the vector control method of three-phase sine inverter, through the analysis of single-phase inverter power system model, using FFT transform and rotateing coordinate transformation technique presents a single-phase inverter power vector control method and has verified the validity of the method thtough the simulation model created in PLECS.To overcome the inherent defects of the analog control, and take the adventages of the digital control and adjust to the development requirements of the inverter power with digital control, to achieve single-phase inverter power vector control algorithm this thesis set FPGA as the main chip. According to the technical requirements of inverter hardware circuit whose core is FPGA is designed. Verilog procedures of the SPWM inverter controller is wrote to finish single-phase inverter power vector control algorithm. Finally, tests of single-phase inverter power with no-load, resistive load and the diode load are carried in double-loop condition, the results show that the digital single-phase inverter power vector control system has good dynamic and static characteristics to keep all voltage output waveforms highly sinusoidal under any loading conditions.