Analytical model is an important tool for prediction of dynamic performance and stability
limits using different control laws and system parameters. Mathematical model of the inverter mustbe established before the design stage. A schematic diagram of the proposed three-phase UPSinverter system is shown in Fig.1,
limits using different control laws and system parameters. Mathematical model of the inverter mustbe established before the design stage. A schematic diagram of the proposed three-phase UPSinverter system is shown in Fig.1,
it mainly consists of a controller, switching bridge and an output
filter. The block diagram of the system can be divided into four parts:
filter. The block diagram of the system can be divided into four parts:
1.A Three-phase PWM Inverter
2. Nonlinear Load
3.Multiple-filter
4.Control system
A mathematical modeling of a system for analysis and design of the proposed control system
was described. The mechanism of output waveform distortion of three-phase PWM inverter with
nonlinear loads through detail theoretical analysis was explained. To eliminate the harmonic
components transferred to the load, a multiple-filter was used at the output of UPS. This filter
enables to reduce THD of the output voltage about 5% and voltage regulation 3%.
was described. The mechanism of output waveform distortion of three-phase PWM inverter with
nonlinear loads through detail theoretical analysis was explained. To eliminate the harmonic
components transferred to the load, a multiple-filter was used at the output of UPS. This filter
enables to reduce THD of the output voltage about 5% and voltage regulation 3%.
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