Study On DSP Controlled Three Phase Inverter For Parallel

As the requirement of high quality and reliability power supply increasing, Uninterruptible power system (UPS) are widely used. And with the development of information technique, Digital Signal Processors (DSP) has been used in many fields. Nowadays the digital control based on DSP in inverter is more popular. And the UPS module working in parallel is considered as an important approach to increase the capability and reliability of power system.In this thesis the inverter control method is dual loop on voltage and inductor-current feedback with an outer average voltage loop. Base on the inverter model, the parameter of these different control loop controller is designed and the digital control achieved through DSP TMS320LF2407A. Above the single inverter mentioned before, the character of circulating current in parallel inverter is provided. And the control method base on active and reactive power is introduced including the reference voltage phase and amplitude adjusts, power calculation and output voltage synchronized in different inverter. Additionally the detail of hardware and software are given. In the end the experimental results are provided.