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Analysis of modified plug-in electric vehicle charger controller with grid support functionalities
Selvakumar R B1, Vivekanandan C1
1Department of Electrical and Electronics Engineering, Dr.N.G.P. Institute of Technology, Coimbatore, Tamilnadu, India.
Plos One
|January 27, 2022
Summary
This study introduces an improved bidirectional Plug-in Electric Vehicle (PEV) charger controller. The novel design enhances power quality by mitigating grid issues and supporting grid functionalities through Vehicle-to-Grid (V2G) technology.
Area of Science:
- Electrical Engineering
- Power Electronics
- Renewable Energy Systems
Background:
- Power quality issues persist, exacerbated by increasing use of power electronic devices and the rise of Plug-in Electric Vehicles (PEVs).
- Current PEV charging systems are predominantly unidirectional (Grid-to-Vehicle, G2V), limiting their grid support capabilities.
- Bidirectional charging (Vehicle-to-Grid, V2G) offers significant potential for grid stability and functionality but faces challenges in controller topology.
Purpose of the Study:
- To design and develop an improved controller topology for a bidirectional PEV charger.
- To enhance grid support functionalities, including active power demand, voltage swell/sag mitigation, and battery charging.
- To improve the transient response and steady-state oscillations of the grid connection.
Main Methods:
- Development and implementation of a Second Order Generalized Integrator Phase Locked Loop (SOGI-PLL) based controller.
- Simulation of a single-phase non-isolated bidirectional PEV charger using MATLAB-Simulink.
- Evaluation of the charger's performance in vehicle support and grid support modes across the active power and reactive power (PQ) plane.
Main Results:
- The proposed controller successfully demonstrated bidirectional power flow, operating in all four quadrants of the PQ plane.
- Significant improvements were observed in DC link voltage overshoot and steady-state oscillations.
- Enhanced overall efficiency and reduced voltage and current Total Harmonic Distortions (THD) were achieved.
Conclusions:
- The developed SOGI-PLL based controller topology effectively addresses power quality issues associated with PEV charging.
- The bidirectional PEV charger provides robust grid support, validating its capability for V2G applications.
- The proposed system offers a promising solution for integrating PEVs into the grid while improving overall power system stability and efficiency.
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