Two-stage robust energy management of a hybrid charging station integrated with the photovoltaic system

This paper proposes the design and dynamic analysis of a possible topology of Electric Vehicle Fast Charging Station (EVFCS), which interconnects Photovoltaic Generator (PV); Stationary Batteries (SB); DC Bus; Electric Vehicle (EV); Power Switches; DC-DC Power Converters (Buck, Boost, and Bidirectional DC-DC Converter); Bidirectional AC-DC Converter; High Frequency Transformer (HFT); Matrix Converter (MC) and LCL Filter, with the possibility of connecting to the Utility Grid. The Stationary Battery will be charged slowly through the Photovoltaic System in the morning and afternoon hours and by the Utility Grid at night. Later, the Stationary Batteries will be discharged and will charge the Electric Vehicle Battery quickly (about 20-30 minutes) through a Bidirectional DC-DC Converter and through the Utility Grid, but with an effort much less to process high power in short time intervals in the distribution transformers. The power and control projects of the system were performed through calculations and validated by performing simulations. The simulations will be done in MATLAB / Simulink software. Three operating scenarios will be created, where the use or not of the Utility Grid will be analyzed, according to the intermittent of the Photovoltaic Generator, the State-of-Charge (SOC) of the Stationary Batteries and the Electric Vehicle. For this, there will be the management of the power flows that will be performed by Power Switches. The results indicate the effectiveness of the proposed strategies.

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A Robust Optimization for Designing a Charging Station Based on Solar and Wind Energy for Electric Vehicles of a Smart Home in Small Villages

10.20944/preprints201806.0316.v1 ◽

2018 ◽

Author(s):

Amir Ahadi ◽

Shrutidhara Sarma ◽

Jae Sang Moon ◽

Jang Ho Lee

Keyword(s):

Renewable Energy ◽

Electric Vehicles ◽

Storage System ◽

Real Life ◽

Energy Systems ◽

Energy Storage System ◽

Photovoltaic System ◽

Design Stage ◽

Renewable Energy Systems ◽

Charging Station

In recent years, integration of electric vehicles (EVs) has increased dramatically due to their lower carbon emissions and reduced fossil fuel dependency. However, charging EVs could have significant impacts on the electrical grid. One promising method for mitigating these impacts is the use of renewable energy systems. Renewable energy systems can also be useful for charging EVs where there is no local grid. This paper proposes a new strategy for designing a renewable energy charging station consisting of wind turbines, a photovoltaic system, and an energy storage system to avoid the use of diesel generators in remote communities. The objective function is considered to be the minimization of the total net present cost, including energy production, components setup, and financial viability. The proposed approach, using stochastic modeling, can also guarantee profitable operation of EVs and reasonable effects on renewable energy sizing, narrowing the gap between real-life daily operation patterns and the design stage. The proposed strategy should enhance the efficiency of conventional EV charging stations. The key point of this study is the efficient use of excess electricity. The infrastructure of the charging station is optimized and modeled.

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Control Strategy of the Hybrid Energy Storage System for Leveling Off Fluctuating Power Output of Stand-Alone Photovoltaic System

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.860-863.608 ◽

2013 ◽

Vol 860-863 ◽

pp. 608-612

Author(s):

Hai Bo Wang ◽

Xiu Yang ◽

Jun Liu ◽

Jie Chen

Keyword(s):

Energy Management ◽

Control Strategy ◽

Storage System ◽

Energy Storage System ◽

Photovoltaic System ◽

Super Capacitor ◽

Hybrid Energy ◽

Hybrid Energy Storage ◽

Hybrid Energy Storage System ◽

And Control

Hybrid energy storage system (HESS) including battery and super-capacitor can take advantages of both high energy density and high power density. In the stand-alone PV micro-grid, in which two buck/boost bidirectional converters are connected to the DC bus directly, a novel energy management scheme is proposed. After filtering the fluctuating power of the HESS, charge and discharge currents of the battery are controlled by hysteresis control method, the super-capacitor supplies the difference of the power. To leveling off the fluctuating power output of photovoltaic system and control the voltage of the DC bus, a new control strategy applied to the bidirectional converter of the super capacitor is put forward. The feed-forward loops of input voltage, load current and output voltage are introduced to improve the response speed and stability of the system. Results of the simulation show the effectiveness of the proposed energy management and control strategy.

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