The objective of this paper is to derive a systematic algorithm to decide the optimal location and size of shunt capacitors and filters f o r d i s t r i b u t i o n s y s t e m s with h a r m o n i c distortion. In this paper, the problem of reactive power compensation is first formulated as a nonlinear programming of minimization of real power loss, energy loss and capacitor cost under voltage constraint. The nonlinear programming problem is solved by the MINOS package to determine the optimal locations and sizes of shunt capacitors. The harmonic load flow is then applied to solve the total voltage harmonic distortion factor(HDF) and the filter design is executed to solve the harmonic distortion and reactive power compensation simultaneously. T o demonstrate the performance and effectiveness of the proposed methodology, a s a m p l e distribution feeder has been selected f o r computer simulation.
In this study, a bidirectional CL3C full-bridge resonant converter was developed using a bidirectional active bridge converter as the main framework to improve conventional LLC resonant converters. A resonant inductor and resonant capacitor were installed at the secondary side of the developed resonant converter. The bidirectional operation of this converter enables zero-voltage switching at the supply-side power switch and zero-current switching at the load side. The aforementioned phenomena enhance the overall circuit efficiency and enable the resonant tank voltage to be increased in the reverse mode, which cannot be achieved with conventional bidirectional LLC resonant converters. The electrical equipment isolation function provided by a transformer made electricity usage safer, and digital control technology was adopted to control electrical energy conversion and simulate bidirectional energy conversion. Specifically, the experiment and simulation emulated how the developed converter enables energy transmission from a DC grid to a battery energy storage system through constant current–constant voltage charging and energy transmission from a battery energy storage system to a DC grid through constant power discharging.
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