| Characterized by the wide application,easy encapsulation and easy expansion,the topology structure and control strategy of the multilevel H-bridge inverter have a broad development prospect,which is one of the hot research subject.This paper mainly studies on the control method of the H-bridge inverter,and analyzes the regulation of the H-bridge inverter in the following aspects:(1)The classification and main topological structure of multilevel inverters are discussed.Based on the main working principles,the advantages and disadvantages of three main multilevel inverters are pointed out.(2)Based on the ideal H-bridge model,the basic principle of single phase H-bridge inverter is studied,and the basic operation mode of H-bridge inverter is analyzed.After the H-bridge inverter unit is cascaded,it not only has the characteristics of the multi-level structure,but also makes up for the defects of the multi-level structure.(3)The basic principle of PWM wave modulation is studied and analyzed on the basis of H-bridge inverter structure.(4)According to the overlay inverter principle of 3H-bridge,PWM waveform double loading is adopted in the modulation technology of control circuit.The modulation principle and operation principle of two pulse step wave modulation are analyzed in detail.In order to verify its feasibility,the H-bridge inverter model is built in the MATLAB simulation platform.The operation results of the simulation system have showed that the strategy is available.(5)When the PWM waveform is loaded twice in the modulation technology of the control circuit,the harmonic content of the system is too high.In order to reduce the harmonic content of the double load PWM wave scheme,an improved modulation scheme is proposed.After the single load pulse modulation on one side of the DC power module produces the modulation waveform,the PWM waveform is fed into the dual load,thus controlling the whole inverter circuit and generating the switches in the circuit. |
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