This paper proposes a new space vector PWM technique for four-switch three-phase inverters (FSTPI) under DC-link voltage ripple condition with the optimization of the amplitude of first harmonic output voltage. The proposed algorithm is based on the establishment of quasi-space-vectors with their maximum lenght and modulation technique, which is simulated the technique for six-switch three-phase inverters. This approach has a very important sense to solve these problems for FSTPI under DC-link voltage ripple conditions, for example ensuring the required voltage for under modulation mode and over modulation mode 1 and 2, extended to six-step mode with the possibility of icreasing the modulation index. The compensated technique also allows reduce the size of DC-link capacitors and the cost of the inverter. Matlab/Simulink is used for the simulation of the proposed dynamic SVPWM algorithm under DC-link voltage unbalance condition. This modified SVPWM technique is also implemented using DSP TMS320LF2407a. The effectiveness of this optimized adaptive SVPWM method and the output quality of the inverter are verified.
This paper is to present a new space vector PWM algorithm for four-switch three-phase inverters (FSTPI) under DC-link voltage imbalance in Photovoltaic or Fuel cellinverter technology. By using reasonable mathematical transform, Space Vector PWM technique for FSTPI under DClink voltage imbalance or ripples have been solved, which is based on the establishment of basic space vectors and modulation technique in similarity with six-switch three-phase inverters. This approach has a very important sense to solve hard problems for FSTPI under DC-link voltage imbalance, for example ensuring the required referenced voltage for undermodulation mode and overmodulation mode 1, 2 to sixstep mode. Matlab/ Simulink is used for the simulation of the proposed SVPWM algorithm for undermodulation, overmodulation mode 1 and 2. This SVPWM approach is also validated experimentally using DSP TMS320LF2407a.
This paper presents and analyses a new dynamic adaptive space vector PWM algorithm for four-switch three-phase inverters (FSTPI) fed induction motor under DC-link voltage ripple. By using reasonable mathematical transform, Space Vector PWM technique for FSTPI under DC-link voltage imbalance or ripples has been proposed, which is based on the establishment of basic space vectors and modulation technique in similarity with sixswitch three-phase inverters. This approach has a very important sense to solve hard problems for FSTPI under DC-link voltage imbalance, for example ensuring the required voltage for under modulation mode and over modulation mode 1 and 2, extended to six-step mode. The compensated technique also allows reduce the size of DC-link capacitors and the cost of the inverter. Matlab/Simulink is used for the simulation of the proposed SVPWM algorithm under DC-link voltage ripple. This SVPWM approach is also validated experimentally using DSP TMS320LF2407a in FSTPI-IM system. The effectiveness of this adaptive SVPWM method and the output quality of the inverter are verified.
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