International Conference Injung Won, Yongsoo Cho, and Kyo-Beum Lee, "Predictive Control Algorithm for Capacitor-less Inverters with Fast Dynamic Response," in Proc. PECON Conf., Nov. 2016, pp. 479–483.
2016
본문
This paper presents a scheme to improve the input current ripple of capacitor-less inverter system using a predictive control
algorithm. The capacitor-less inverter, which is using small capacitor in the dc-link, has several advantages such as competitive cost,
compact size, enhanced reliability, and elimination of initial charging circuit. However, the dc-link voltage shows instability because
the energy storage capability of the small capacitor is not sufficient. Therefore, DC-link shunt compensator (DSC) should be used in
capacitor-less inverter to stabilize the dc-link voltage and nullify the negative impedance by injecting the compensation current.
However, the general proportional integral (PI) current controller, which has wide bandwidth to track the compensation current
having a sinusoidal waveform, is weak for the noise and disturbance. This paper proposes a model predictive control (MPC) algorithm
to improve the performance of DSC. Given the optimal duty cycle calculated by estimating the next state current, the proposed
algorithm has a fast dynamic response and accuracy. The proposed method is verified through PSIM simulations.
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