• The Journal of the Korea institute of electronic communication sciences
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• v.17 no.5
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• pp.841-852
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• 2022

In this paper, a 3-phase inverter output waveform generator based on SPWM control was developed to verify the performance of the LCL filter. In order to obtain a test signal for verifying the performance of the filter, first, a DSP-based 3-phase SPWM signal generation algorithm was developed, and then a three-phase voltage source inverter circuit was designed using three half-bridge gate drivers. Next, one LCL filter was experimentally fabricated to verify the effectiveness of the developed SPWM-based 3-phase inverter output waveform generator as a test signal generator, and a DSP-based performance verification system was experimentally constructed. Finally, by comparing the three-phase voltage waveform before and after the LCL filter obtained in the output control experiment with the given time ratio, the effectiveness of the SPWM-based 3-phase inverter output waveform generator was verified.

• Proceedings of the KIPE Conference
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• 1998.10a
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• pp.808-812
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• 1998

A new SPWM control method for Uninterrupted Power System(UPS) is presented. A triangle waveform is used as the reference signal. The desired SPWM control signal can be obtained more easily with a group of comparators. The output AC voltage can be regulated by controlling the lower reference and the upper reference of the comparators according to the feedback voltage. Basic principle, an actual circuit and the experimental results on a 500W UPS for computer system is discussed as an example.

• Journal of Power Electronics
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• v.16 no.6
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• pp.2099-2108
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• 2016

The cascaded multilevel converter is widely adopted to medium/high voltage and high power electronic applications due to the small harmonic components of the output voltage and the facilitation of modularity. In this paper, the operation principle of a T-type H-bridge topology is investigated in detail, and a carrier phase shifted pulse width modulation (CPS-PWM) based control method is proposed for this topology. Taking a virtual five-level waveform achieved by a unipolar double frequency CPS-PWM as the output object, PWM signals of the T-type H-bridge can be obtained by reverse derivation according to its switching modes. In addition, a control method for the T-type H-bridge based cascaded multilevel converter is introduced. Then a single-phase T-type H-bridge cascaded multilevel static var generator (SVG) prototype is built, and a repetitive controller based compound current control strategy is designed with the DC-link voltage balancing control scheme analyzed. Finally, simulation and experimental results validate the correctness and feasibility of the proposed modulation method and control strategy for T-type H-bridge based cascaded multilevel converters.