This paper presents a triplen controller for a dc-dc resonant converter, which provides excellent load voltage regulation with respect to wide variations in input voltage from renewable sources in a dc micro grid. The control provides enhanced converter efficiency and soft switching of all the switches from rated load to very light load. In the proposed control, duty cycle modulation, switching frequency modulation, and phase shift modulation between active bridges are simultaneously varied in order to maintain constant dc voltage. The two control variables viz., switching frequency and duty ratio are simultaneously adjusted keeping phase shift fixed, in order to regulate voltage with respect to load variations and increase in the input voltage. Whereas, the third control variable, i.e., phase shift regulates output voltage when input from renewable sources is reduced, by keeping frequency and duty ratio fixed. The three control variables provide the greater degree of freedom. The experimental and simulation results of the programmable triplen control are presented for a resonant converter operating from the rated load of 3 kW to 5% of rated load 0.15 kW. The proposed control also tested for the input voltage range of 180-260 V (i.e., 220 V, ± 18% tolerance) in order to validate the functionality of the proposed control. INDEX TERMS Switching frequency, DC-DC converter with active bridges, phase shift control, duty cycle, zero voltage switching (ZVS).
This paper presents a programmable triple hybrid controller for DC-DC resonant converter which provides excellent DC grid voltage regulation when input voltage from renewable sources is reduced. The proposed control also exhibits superior performance in terms of conversion efficiency and soft switching of all the switches from rated load to very light load. In the triple hybrid controller, duty cycle modulation, switching frequency modulation and phase shift modulation are simultaneously adjusted in order to maintain constant DC bus voltage and maintain zero voltage switching (ZVS). The third control variable i.e. phase shift between two active bridges regulates output voltage when input voltage is varied. So, the converter with proposed controller can act as a smart power electronic interface between renewable energy resources and DC grid. The experimental and simulation results of the triple hybrid control for resonant converter tested on a 3kW with 100 kHz switching frequency are presented for an input voltage range of 250V-180V to validate the functionality of the proposed control.
This paper presents practical design aspects of a high-power DC-DC converter which is applicable to renewable sources for dc grid. The output voltage of a dc-dc resonant converter can be varied by adjusting the switching frequency. In order to maintain output voltage constant from full load to no load using conventional frequency control, the range of switching frequency variation is very high. This consequently increases switching losses, electromagnetic interference which deteriorates the system performance especially for light loads. This paper proposes an algorithm to maintain output voltage constant by variable switching frequency and duty cycle with combined effect. The response using proposed algorithm is tested with 250 W, 110/480V dc-dc resonant converter and performance is analyzed using PSIM simulation.
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