The Research Of Experimental And The Analysis Of The Low Harmonic Of Three-Phase Low-Frequency Inverter Circuit Characteristics

New energy development and utilization, high voltage dc transmission technology, a dc distribution network technology, the future power grid construction, the complication of power distribution network, users high quality electricity and the electricity form diversified factors, such as, to the safe and stable operation of power system has brought great challenges. Conversion technology as the emerging industry and electric power system connecting bridge, numerous scholars have become nowadays and future research of one of the core technology. Especially with the rapid development of power electronic technology application and popularization, more reflect electricity transformation technology play an important role in power system.The rapid development of power switch device, greatly promote the energy transform core technology, the rapid development of inverter technology. At present, the domestic and foreign research more widely used in inverter technology, thyristor (SCR) inverter and PWM inverter is scholars, the main research content. Through the analysis of thyristor inverter has low working frequency, high voltage utilization ratio, small switch loss, and large output current harmonic content, shortcomings and so on is only active inverter; And PWM inverter has active passive inverter can be realized, good quality of output waveform, isolate the advantages of reactive power and harmonic and the voltage utilization ratio is low, the switch loss, such as electromagnetic interference is serious shortcomings. Therefore, combining the basic features of the two inverter, design a can have both at the same time the advantages of inverter function without the shortcomings of their respective new inverter device.Used to flow through the motor winding every harmonic current have cut inhibition effect, combined with proper inverter switch circuit design a new type of inverter device, inverter control system adopts CPLD controller design. Finally, the design of inverter device to test and analysis, by experimental analysis, the new inverter device has low working frequency, small switch loss, which can realize active passive inverter, less harmonic content of output waveform, isolation function of reactive power and harmonic, high voltage utilization ratio. To further verify the effectiveness of the device physics experiment and theoretical analysis are basically identical.Article from the basic characteristic of the thyristor inverter and PWM inverter, designed a new inverter device, electrical energy transformation technology provides a certain technology for the future development ideas and technical support.