Most of modern distributed generation (DG) sources are connected to local grid or AC loads via power electronic-based interfaces. Hence, control techniques of these interfaces are of the great concerns. In this paper, a novel control strategy applicable to multifunction DG-grid interfaces is introduced. The active power management is achieved through the d-component extraction from the current injected by DG. Also, an innovative method, called complex-recursive least square (C-RLS) algorithm is proposed to generate the reference signal for power quality (PQ) improvement. The proposed algorithm is primarily assessed by simulation under MATLAB software environment in estimating sequence harmonic components of a set of three-phase dynamically changing artificial signals. Afterwards, simulation of a modelled multifunction DG-grid interface system connected to a test distribution utility and local loads with the proposed control strategy is carried out to investigate the performance of the suggested algorithm. The control scheme, which is based on C-RLS, is evaluated in both forward and reverse interconnected modes of operation in which the local load active power demand is higher or less than DG active power injection, respectively. Simulation results indicate that the structure shows an excellent performance in both cases when the proposed reference signal generation scheme is employed to control a three-leg four-wire split DC-voltage source inverter (VSI) to simultaneously manage the transferring of DG active power, as well as harmonic, unbalance and neutral currents compensation and power factor improvement in the test distribution network. Copyright (c) 2014 John Wiley & Sons, Ltd.
A novel reference current generation strategy for multifunction DG-grid interface, using C-RLS algorithm
Sobhan Mohamadian;
2015-01-01
Abstract
Most of modern distributed generation (DG) sources are connected to local grid or AC loads via power electronic-based interfaces. Hence, control techniques of these interfaces are of the great concerns. In this paper, a novel control strategy applicable to multifunction DG-grid interfaces is introduced. The active power management is achieved through the d-component extraction from the current injected by DG. Also, an innovative method, called complex-recursive least square (C-RLS) algorithm is proposed to generate the reference signal for power quality (PQ) improvement. The proposed algorithm is primarily assessed by simulation under MATLAB software environment in estimating sequence harmonic components of a set of three-phase dynamically changing artificial signals. Afterwards, simulation of a modelled multifunction DG-grid interface system connected to a test distribution utility and local loads with the proposed control strategy is carried out to investigate the performance of the suggested algorithm. The control scheme, which is based on C-RLS, is evaluated in both forward and reverse interconnected modes of operation in which the local load active power demand is higher or less than DG active power injection, respectively. Simulation results indicate that the structure shows an excellent performance in both cases when the proposed reference signal generation scheme is employed to control a three-leg four-wire split DC-voltage source inverter (VSI) to simultaneously manage the transferring of DG active power, as well as harmonic, unbalance and neutral currents compensation and power factor improvement in the test distribution network. Copyright (c) 2014 John Wiley & Sons, Ltd.Pubblicazioni consigliate
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