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A LLC resonant converter (LLC-RC) has been widely used in DC/DC converters for the benefits of high efficiency and high power density. The efficiency of a LLC resonant converter is greatly dependent on the switching frequency. In order to achieve higher efficiency, the switching frequency should be equal to the resonant frequency. This paper presents a novel resonant frequency tracking technique for...
A model predictive control (MPC) is proposed for a buck-type active power filter (APF) integrated single-phase quasi-Z-source inverter (qZSI) to directly eliminate the dc-side low-frequency ripple power. The buck-type APF operates independently from the main circuit power devices, comparing to the coupled-type APF. The proposed MPC compensates the low-frequency ripple power directly by the APF capacitor...
This paper develops a single-phase ZVS bidirectional AC-link converter to interface batteries of Electric Vehicles (EVs) to the electric grid. A parallel Link inductance charges from the input (grid/battery). Then, the inductance partially resonates with the help of a parallel capacitance. After that, it discharges to the output (battery/grid). Furthermore, during charging mode, the power is fed into...
An impedance parameter design of quasi-Z-source (qZS) H-bridge inverter module applied to megawatt (MW)-scale medium-voltage Photovoltaic (PV) power system is proposed. A double-line-frequency (2ω) voltage and current ripple model of qZS network with PV panel is established. The effects of qZS inductance and capacitance as well as PV panel terminal capacitance on 2ω voltage and current ripples are...
A speed sensorless control system for an induction motor with predictive current controller is presented. The whole control does not require measurements of the motor speed and motor flux. A closed loop observer system with robustness against parameters variation is used for the control approach. The proposed observer computes the required state variables correctly in wide frequency range. In the...
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