PCS Efficiency Range Control for ESS-Supported EV Charging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The integration of energy storage systems (ESS) and electric vehicle chargers faces challenges in stabilizing power supply and optimizing power conversion efficiency, particularly during peak electricity consumption, leading to limitations in electric vehicle charging and increased grid electricity usage.
Innovation Solution
A power control system that includes an energy storage system (ESS) connected to a power grid, a power conversion system (PCS), and a control unit prioritizing power conversion efficiency by managing charging and discharging processes within a specific range to optimize the efficiency of the PCS, utilizing vanadium ion batteries (VIB) for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the electric vehicle charger is used during peak electricity consumption, then electric vehicle charging service is provided, but grid electricity consumption increases and power supply stability deteriorates
Solution Approach 1:
The energy storage system performs preliminary charging during off-peak hours when electricity consumption is low, storing energy in advance. During peak charging demand, this pre-stored energy is discharged to supplement grid power, reducing peak grid electricity consumption and avoiding overloading while ensuring continuous charging service.
2Adaptability or versatility
If the power conversion system operates outside optimal efficiency range, then charging/discharging flexibility is improved, but power conversion efficiency deteriorates
Solution Approach 1:
The control unit dynamically adjusts the operating point of the power conversion system based on real-time conditions. It monitors the state of charge of the energy storage system and the charging power demand, then optimizes the power conversion parameters to maintain operation within the optimal efficiency range while adapting to varying charging/discharging requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system stabilizes power supply for electric vehicle charging, optimizes power conversion efficiency, and reduces grid electricity usage by effectively managing charging and discharging processes, ensuring stable and efficient electric vehicle charging services.
Implementation Method 1
An energy storage system (VIB ESS) including a vanadium ion battery
Data Source
AI summary
A power control apparatus includes an energy storage system that is connected to a power grid and includes a battery; a power conversion system (PCS) operatively connected to the power grid and the energy storage system; and a control unit configured to control a charging procedure and a discharging procedure for the battery by giving a priority to power conversion efficiency of the PCS. A control method of a power conversion apparatus includes using a power conversion unit to provide a control of transferring at least one of power of a power grid and power of an energy storage system to an electric vehicle charging system, and a management control to correspond to an optimal efficiency range with respect to power conversion by controlling charging/discharging of the energy storage system according to an electric vehicle charging speed.