3 phase online ups uninterruptible power supply electrical Circuit knowledge
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The three-level SPWM wave can be obtained by the two-level SPWM wave through the phase-shifting and superposition method, as shown in Figure 1. There are two phase-shifting and superposition methods: one is to first shift the phase of the sinusoidal modulation wave by 360°/2=180°, as shown in Figure 1(b), and then compare it with the…
Single-phase two-level SPWM inverter refers to an SPWM inverter whose modulation wave is sine wave, carrier wave is bipolar triangle wave, and output voltage is two-level waveform. It is the most basic of all SPWM inverters. Constituent unit, can be used as a bridge arm of a three-phase SPWM inverter. For SPWM inverters, special attention…