VSVPWM (Virtual Space Vector Pulse Width Modulation)-based three-level inverter neutral point potential compensation balance control strategy
A three-level inverter, balanced control technology, applied in electrical components, output power conversion devices, AC power input into DC power output and other directions, can solve the output voltage waveform distortion, affect the performance of the frequency conversion speed regulation system, issues such as increasing costs
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[0030] The midpoint potential compensation balance control strategy of the three-level inverter based on VSVPWM includes the following steps:
[0031] The first step is to recombine the traditional space voltage vector, as shown in the attached figure 1 shown. When the three-level inverter is working normally, the three-phase load current is symmetrical. If the action time of the medium vector is evenly distributed to two small vectors and one medium vector, the current flowing into the midpoint can be expressed as . Based on this idea, a virtual neutral vector is introduced: , .
[0032] The action time is evenly distributed among the 3 vectors , so that the current flowing into the midpoint in each switching cycle is always zero, ensuring the balance of the midpoint potential, It also affects the midpoint potential, but because the positive and negative small vectors have opposite effects on the midpoint potential, if the action time of the positive and negative...
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