Clamping-type three-phase voltage-source type inverter and control method thereof
A technology of three-phase voltage and control method, which is applied in the direction of electrical components, AC power input conversion to DC power output, output power conversion device, etc., which can solve the problems of unbalanced midpoint voltage, large current and power consumption of power electronic devices, Power electronic devices withstand problems such as excessive voltage, and achieve the effect of good output waveform quality and improvement of midpoint potential balance problems
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[0034] The present invention will be further described below in conjunction with the accompanying drawings.
[0035] A three-level inverter based on a neutral point clamp, such as figure 1 As shown, including a DC power supply, a three-phase three-level inverter bridge, a three-phase LC filter and a three-phase load, the three-phase three-level inverter bridge includes three single-phase circuits connected in parallel and the first, The second capacitor; the first and second capacitors are C 1 , C 2 The first capacitor C 1 , DC power supply, second capacitor C 2 They are connected in series in sequence; in the figure, the filter inductance is L, the filter capacitor is C, and R o Represents the total effect of inductance loss, line impedance and switching tube turn-on and turn-off losses. The so-called three-level means that the output terminal of each phase on the AC side of the inverter obtains output voltages in three states from the intermediate DC circuit, which are ...
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