PROJECT TITLE :
Simultaneous Microgrid Voltage and Current Harmonics Compensation Using Coordinated Control of Dual-Interfacing-Converters - 2016
The growing installation of distributed generation (DG) units in low-voltage distribution systems has popularized the concept of nonlinear load harmonic current compensation using multifunctional DG interfacing converters. It is analyzed in this paper that the compensation of local load harmonic current employing a single DG interfacing converter could cause the amplification of supply voltage harmonics to sensitive loads, significantly when the main grid voltage is extremely distorted. To address this limitation, unlike the operation of typical unified power quality conditioners with series converter, a new simultaneous offer voltage and grid current harmonic compensation strategy is proposed using coordinated control of two shunt interfacing converters. Specifically, the first converter is responsible for local load offer voltage harmonic suppression. The second converter is employed to mitigate the harmonic current made by the interaction between the primary interfacing converter and also the local nonlinear load. To notice a easy control of parallel converters, a modified hybrid voltage and current controller is also developed within the paper. By using this proposed controller, the grid voltage section-locked loop and the detection of the load current and the provision voltage harmonics are unnecessary for each interfacing converters. Thus, the computational load of interfacing converters will be considerably reduced. Simulated and experimental results are captured to validate the performance of the proposed topology and the management strategy.
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