Abstract
This study examines the use of Unified Power Quality Conditioner (UPQC) to mitigate the power quality problems existed in the grid and the harmonics penetrated by the non-linear loads. The UPQC is supported by the Photovoltaic (PV) and Battery Energy Storage System (BESS) in this work. Generally, the PV system supplies the active power to the load. However, if the PV is unable to supply the power then the BESS activates and provides power especially during the longer-term voltage interruption. The standalone PV-UPQC system is less reliable compared to a hybrid PV-BESS system because of its instability and high environment-dependency. Therefore, BESS will improve the voltage support capability continuously in the longer-term, reduce the complexity of the DC-link voltage regulation algorithm, and keep producing clean energy. The phase synchronization operation of the UPQC controller is directed by a self-tuning filter (STF) integrated with the unit vector generator (UVG) technique. Implementation of STF will make sure the UPQC can successfully operate under unbalanced and distorted grid voltage conditions. Thus, the requirement of a phase-locked loop (PLL) is omitted and the STF-UVG is utilized to produce the synchronization phases for the series and shunt active power filter (APF) compensator in UPQC controller. Finally, the proposed STF-UVG method is compared with the conventional synchronous references frame (SRF-PLL) method based UPQC to show the significance of the proposed technique. Several case studies are further considered to validate the study in MATLAB-Simulink software.
Highlights
Energy is the basic input of life
SIMULATION RESULTS The operation of proposed PV-Battery Energy Storage System (BESS)-Unified Power Quality Conditioner (UPQC) using STFUVG combine with self-tuning filter (STF)-dq0 filter technique is presented and the operation is analysed using MATLAB-Simulink platform (R2018a)
The performance of the proposed model is analysed in a comparative manner, performance simulated by UPQC that connected with PV and BESS as external support of DC-link capacitor is compared with standard conventional UPQC to validate the significance of UPQC after connecting the external support of DC-link
Summary
Energy is the basic input of life. Electricity is one of the significant energy among the different forms of energy. The current related harmonics problem was not considered In such case, energy storage system like BESS can be interfaced with the PV-UPQC and can be a great support for continuously providing real power to the load. The synchronization phases in term of unit vector is apply on the reference current generation in shunt compensator that design with integrating together with strength STF with working concept of the direct-quadraturezero (STF-dq0) that not depending on any components of PLL. The proposed technique that will applying on UPQC controller need to be superior and more reliable when dealing with unbalanced and distorted voltage grid condition It is can maintaining grid current sinusoidal with regulating the desired load voltage which minimizing the phase difference to achieve almost unity power factor. The performance of the suggested UPQC system is investigated utilizing MATLAB-Simulink software under dynamic condition
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