Abstract
This paper proposes optimal control strategies of a standalone Hybrid Power System (HPS) to supply sustainable and optimal energy to an isolated site with improved quality of electrical energy. A topology of Isolated Hybrid Power System (IHPS) is proposed, consists of: a Photovoltaic System (PVS), a Wind Energy Conversion System (WECS), electronic power devices controlled to maximize energy production from renewable sources and to maintain the constant DC-link voltage, a Battery Energy Storage System (BESS), Diesel Generator (DG), and a Pulse Width Modulation (PWM) Voltage Source Inverter (VSI) located at the load-side end. In addition, a novel control strategy has been proposed, in this work, to maximize the power from the PVS. This presented strategy, based on the combination between Perturb and Observe (P&O) algorithm and the Fuzzy PI Controller (FPIC), presents a good performance, especially in the dynamic state compared to the classical algorithm P&O. A supervisory control algorithm has been elaborated to manage the energy flows between the devices of the hybrid system to make the decision of the optimal operating mode in order to ensure a continuous supply of the load with minimum usage of batteries and DG. The simulation results developed in the Matlab/Simulink environment are applied to show the efficiency and performance of the proposed control strategies in terms of power optimization and energy management. Doi: 10.28991/esj-2021-01262 Full Text: PDF
Highlights
In the last decade, the exhausting fossil fuels and increasing electrical energy demand are the huge issues on the international agenda
The model of the Isolated Hybrid Power System (IHPS) is designed and simulated with Matlab/Simulink platform, to verify the performance of the proposed power management strategy in different scenarios and under variable weather conditions. In this proposed IHPS, the Photovoltaic System (PVS) and the Wind Energy Conversion System (WECS) are considered as the main power sources for supplying the energy demand of 30 KW maximum to the load: 15 KW principal load, 10 KW additional load and 5KW dump load
The PV generator (PVG) is composed of 5 strings connected in parallel, each string consists 7 modules connected in series
Summary
The exhausting fossil fuels and increasing electrical energy demand are the huge issues on the international agenda. This configuration is known by its technical-economic advantages in supplying energy for isolated areas [4]. It can be summarized as follows scenarios: Scenario 1: The total power generation from PVS and WECS reaches 25kW In this case, the principal and additional loads will be supplied only by RESs. Scenario 2: If the RESs energy is greater than the load demand and the SOC is less than 95%, the excess is used to charge the batteries. Scenario 6: In case of PV and wind energy sources is insufficient to supply loads and the SOC is less than 35%, diesel generator starts to supply only the principal loads
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