抄録
In a large-scale inverter system, a DC circuit connects the rectifier and the inverter. A harmonic resonance phenomenon is often induced by the DC capacitor to stabilize the voltage and the inductance of distribution wires. When the harmonic resonance is induced, the DC circuit is interfered with by the magnified harmonic component of the inverter input current. Therefore, it is necessary to analyze the harmonic resonance phenomenon and the inverter input current. To absorb the harmonic current and voltage, the DC capacitor is connected to the rectifier and the inverter sides in the DC circuit. Moreover, to restrain the voltage fluctuation by sudden changes in the load, it is necessary to connect more DC capacitors. We clarified the relation between the harmonic resonance phenomenon and the capacitor distribution on both sides, examined the input harmonic current of the multiple stages PWM inverter that is used to drive the LSM and has different configurations depending on train speed, and confirmed the above by simulation.
