FACTS Based Stabilization for Smart Grid Applications (original) (raw)
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International Journal of Electrical and Computer Engineering (IJECE), 2021
Increasing nonlinear loads and power electronic converters lead to various power quality issues in microgrids (MGs). The interlinking converters (ILCs) can participate in these systems to harmonic control and power quality enhancement. However, ILC participation deteriorates the dc link voltage, system stability, and storage lifetime due to oscillatory current phenomena. To address these problems, a new control strategy for a hybrid energy storage system (HESS) is proposed to eliminate the adverse effects of the harmonic control operation of ILC. Specifically, battery and super-capacitor (SC) are used as HESSs that provide low and high power frequency load, respectively. The proposed strategy tries to compensate the current oscillation imposed by ILC with fuzzy control of HESS. In this method, a proportional-resonant (PR) controller integrated with harmonic compensator (HC) is employed to control the ILC for power quality enhancement and oscillatory current elimination. The main advantages of the proposed strategy are to reduce DGs power fluctuations, precise DC bus voltage regulation for generation and load disturbances, improved grid power quality under nonlinear load and transition conditions. The performance of the proposed method for isolated and grid-connected modes is verified using simulation studies in the MATLAB software environment. Keywords: Hybrid energy storage Interlinking converter Microgrid Nonlinear load This is an open access article under the CC BY-SA license. 1. INTRODUCTION Nowadays, renewable energy sources (RES) such as wind turbines, photovoltaic (PV) arrays, fuel cells, dc loads and energy storage components are increasingly being connected to the distribution grids [1, 2]. ILC is an efficient solution to connect the dc MGs to the upstream ac grid, introducing full controllability for power exchange, power quality, and reliability enhancement, voltage regulation and etc. Respect to the increased nonlinear loads such as diode rectifiers and adjustable-speed ac motor drives in distribution networks, the MG voltage at the point of common coupling (PCC) can be distorted. In case of large nonlinear loads, harmonic content should be decreased using passive or active power filters which are an expensive solution, so ILCs can be effectively used to suppress harmonic currents imposed by nonlinear loads. The ILCs can contribute to voltage stability improvement [3, 4], voltage unbalance compensation [5, 6], flicker mitigation [7], harmonic compensation [8-10] and reactive power compensation [11] in MGs and distribution networks. As the number of nonlinear loads is growing rapidly in distribution systems, ILC harmonics compensation plays an interesting and important role. Harmonic compensation can be