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The Chopper Circuits are widely used in practical applications, but the voltage output of open-loop Buck Chopper could not meet application requirements on stability, accuracy and rapidity. Aiming at these existing problems, this paper presents a closed-loop design, which constitutes the negative feedback by adopting incremental PI regulation and PWM control, to obtain stable and accurate output....
This article presents a novel design of voltage swells restorer using transformer and PWM AC chopper. The proposed dynamic voltage restorer uses an ac chopper converter to generate compensation voltage and adopts the transformer to isolate the power converter from the load. When input voltage swells occur, proper compensation voltage is obtained by changing the duty cycle of the PWM control signals...
This paper presents a one stage circuit topology for a double buck chopper type single phase PFC converter with active power filtering function in a utility AC grid side and DC output power quality, which can realize much smaller in reactor size and lighter in its weight, along with two unique channel control schemes. The main advantageous point of the newly-proposed PFC converter includes that the...
This paper proposes a new high-efficiency solar power conditioner suitable for interface with thin-film solar cells, which is composed of a zigzag-connected chopper (ZCC) converter and a series active power filter. The ZCC converter provides a bipolar rectangle voltage pulse, even where the negative terminal of the dc input is grounded without line- or high-frequency transformer. The series active...
This paper presents a one stage circuit topology for a double buck chopper type single phase PFC converter with active power filtering function in a utility AC grid side and DC output power quality, which can realize much smaller in reactor size and lighter in its weight, along with two unique channel control schemes. The main advantageous point of the newly-proposed PFC converter includes that the...
Multilevel neutral point clamped inverter systems are increasingly used in load compensation applications. But, the most significant problem associated with these compensators is the capacitor voltage imbalances and drift due to DC components in the zero sequence current, resulting in degradation of tracking performance of the voltage source inverter. This paper proposes a carrier based PWM control...
A modular multilevel converter (MMC) is one of the next-generation multilevel PWM converters intended for high- or medium-voltage power conversion without transformers. The MMC consists of cascade connection of multiple bidirectional PWM chopper-cells and floating dc capacitors per leg, thus requiring voltage-balancing control of their chopper-cells. However, no paper has been discussed explicitly...
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