A DC-link capacitor minimization method through direct capacitor current control
SCIE
SCOPUS
- Title
- A DC-link capacitor minimization method through direct capacitor current control
- Authors
- Gu, BG; Nam, K
- Date Issued
- 2006-03
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGI
- Abstract
- If the converter side dc-link current is made equal to the inverter side dc-link current in a pulsewidth modulation (PWM) converter-inverter system, no current will How through the dc-link capacitor. As a result, no dc-link voltage variation occurs. This leads to the possibility of making a large reduction in the size of dc-link capacitors, which are expensive, bulky, and have a lifetime limit. However, a converter current control loop inherently involves a delay in supplying the required current. In this paper, a capacitor current is nullified with a feedforward compensation term. To minimize the response delay, the authors calculate the compensation amount in terms of voltage and inject it at the voltage node. In calculating the compensation term, a differentiator is incorporated with a one-step predictor developed from converter and inverter dynamics. Simulation and experiments are performed with only 40 mu F of dc-link capacitance for a 9-kW motor, and the results support the validity of the proposed scheme.
- Keywords
- DC-link capacitor; induction motor; pulsewidth-modulation; (PWM) converter; PWM inverter; VOLTAGE-SOURCE CONVERTER; PWM CONVERTER; FREQUENCY
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/24115
- DOI
- 10.1109/TIA.2006.870036
- ISSN
- 0093-9994
- Article Type
- Article
- Citation
- IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, vol. 42, no. 2, page. 573 - 581, 2006-03
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