Power management and control strategies for off-grid hybrid power systems with renewable energies and storage

Belkacem Belabbas,Tayeb Allaoui,Mouloud Denai,Mohamed Tadjine

doi:10.1007/s12667-017-0251-y

Abstract

This paper presents a simulation study of standalone hybrid Distributed Generation Systems (DGS) with Battery Energy Storage System (BESS). The DGS consists of Photovoltaic (PV) panels as Renewable Power Source (RPS), a Diesel Generator (DG) for power buck-up and a BESS to accommodate the surplus of energy, which may be employed in times of poor PV generation. While off-grid DGS represent an efficient and cost-effective energy supply solution particularly to rural and remote areas, fluctuations in voltage and frequency due to load variations, weather conditions (temperature, irradiation) and transmission line short-circuits are major challenges. The paper suggests a hierarchical Power Management (PM) and controller structure to improve the reliability and efficiency of the hybrid DGS. The first layer of the overall control scheme includes a Fuzzy Logic Controller (FLC) to adjust the voltage and frequency at the Point of Common Coupling (PCC) and a Clamping Bridge Circuit (CBC) which regulates the DC bus voltage. A maximum power point tracking (MPPT) controller based on FLC is designed to extract the optimum power from the PV. The second control layer coordinates among PV, DG and BESS to ensure reliable and efficient power supply to the load. MATLAB Simulink is used to implement the overall model of the off-grid DGS and to test the performance of the proposed control scheme which is evaluated in a series of simulations scenarios. The results demonstrated the good performance of the proposed control scheme and effective coordination between the DGS for all the simulation scenarios considered.

Highlights

Standalone Distributed Generation Systems (DGS) consisting of small-scale power generation and Battery Energy Storage System (BESS) to supply electricity close to the point of consumption are a viable solution for the future development of electric power infrastructure in remote localities where the connection to the main grid is difficult or not affordable
The overall model and control scheme have been simulated for three diverse scenarios which described in the following sub-sections
5 CONCLUSIONS The paper focused on the design and evaluation of a hierachical power management and control scheme for an offgrid Hybrid Power Systems (HPS) consisting of a PV, a DG and a BESS for energy storage

Summary

Introduction

Standalone Distributed Generation Systems (DGS) consisting of small-scale power generation and BESS to supply electricity close to the point of consumption are a viable solution for the future development of electric power infrastructure in remote localities where the connection to the main grid is difficult or not affordable. The control scheme includes (1) voltage and frequency regulation of the voltage source inverter at the PCC, (2) clamping-bridge circuit to stabilize the DC bus voltage, (3) a PM algorithm to coordinate between PV/DG/BESS under different scenarios and provide the protection of the HPS. The paper is organised as follows: Section 2 describes the proposed off-grid HPS including a presentation of the PV system and its MPPT control strategy, the Li-ion battery model with the buck-boost DC-DC converter and its control and the sizing of the DG.

Results

Conclusion