This paper investigates the application of a vehicle-to-grid (V2G)-enabled bidirectional off-board electric vehicle (EV) battery charger on the grid current harmonic compensation (GCHC) and reactive power compensation (RPC) and simultaneously uses it as a battery charger and power generator. To generate reference current, the proposed EV charger control algorithm processed the nonlinear residential load current and point of common coupling (PCC) voltage, to estimate the active load current component and synchronizing voltage template, respectively. The EV charger control algorithm uses an adaptive notch filter (ANF) to generate the in-phase and 90 shifted synchronizing voltage template from PCC voltage. Furthermore, a resonant filter is used to extract the fundamental frequency residential load current component accurately. The extracted fundamental component is sampled and hold at zero crossings of the 90 shifted synchronizing voltage template to estimate the active load current component. As a result, the proposed control algorithm ensures effective performance without depending on any phase-locked loop (PLL). The charger performance with the proposed control algorithm is validated by the simulation results obtained using MATLAB/Simulink. Furthermore, an off-board EV battery charger experimental prototype is built in the laboratory to verify the obtained simulation results.
K E Y W O R D Sadaptive notch filter, bidirectional off-board EV battery charger, harmonic compensation, power quality, reactive power compensation, vehicle to grid (V2G)
Summary
This paper describes an empirical mode decomposition control algorithm to extract the fundamental component and set the reference for harmonic extraction in a cascaded multilevel inverter–based shunt active filter. The proposed technique is fully reliant on the data samples that are decomposed instantaneously and does not require any weighing factor. The fundamental component of load current is found by applying a novel empirical mode decomposition algorithm from the nonlinear load current samples. Spline interpolation is used to extract the intrinsic mode function. For online implementation, the maxima and minima points of load current are stored using a modified field programming gate array (FPGA)‐based circular buffer circuit. Finally, the proposed cascaded multilevel inverter–based shunt active filter is investigated both by simulation and hardware implementation. The results obtained validates the performance of the proposed control technique under balanced and unbalanced loading conditions.
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