Integrated ESS EV Charging With Grid Peak-Shaving Control
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Solution Overview
Problem
The existing energy storage systems (ESS) and electric vehicle charging systems face challenges in stabilizing power supply, managing power flow efficiently, and responding to emergency situations, particularly during peak electricity consumption, leading to limitations in electric vehicle charging and increased grid electricity consumption.
Innovation Solution
An integrated system that combines an energy storage system (ESS) with a charger, utilizing a power conversion unit, sensor network, and advanced management methods to control and manage power flow, assist grid power, and recognize emergency situations, enabling stable electric vehicle charging and efficient energy use by selectively discharging or charging based on grid conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an electric vehicle charger is disposed in various spaces to expand EV charging, then EV charging availability is improved, but electricity consumption of the grid increases and other electricity consumption in the corresponding space is influenced
Solution Approach 1:
An energy storage system (ESS) is introduced as an intermediary between the power grid and the EV charger. The ESS stores excess grid power during low-demand periods and discharges it during peak charging periods, mediating the power flow to enable EV charging without directly increasing grid consumption at critical moments.
Solution Approach 2:
The energy storage system performs preliminary charging from the grid during periods of low electricity consumption. By storing energy in advance when grid demand is low, the system prepares power reserves that can be used later during peak charging periods, preventing grid overload.
2Power
If the electricity consumption is soaring, then power demand increases, but the use of the electric vehicle charger is limited
Solution Approach 1:
The ESS acts as a buffer between the grid and the charger, decoupling charger operation from immediate grid conditions. When grid power is abundant, the ESS charges; when power demand is high and grid supply is constrained, the ESS discharges to maintain charger availability.
Solution Approach 2:
The system dynamically changes operational parameters by switching between grid-powered charging and ESS-powered charging based on real-time grid conditions. This parameter adjustment allows the charger to maintain availability regardless of soaring electricity consumption periods.
3Reliability
If an energy storage system is integrated with a charger to stabilize power supply, then power supply stability is improved, but device complexity increases
Solution Approach 1:
The energy storage system and EV charger are merged into a single integrated unit with shared control electronics, housing, and connection interfaces. This consolidation reduces overall system complexity compared to having separate ESS and charger installations while maintaining power supply stability.
Solution Approach 2:
The integrated system performs multiple functions: EV charging, grid energy storage, peak shaving, and power stabilization. By combining these functions into one system rather than separate installations, the overall device complexity is reduced while achieving reliable power supply.
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, manages power flow effectively across the grid, and responds to emergencies, reducing dependency on specific apparatuses and enhancing energy efficiency by utilizing ESS power to supplement grid power when needed.
Implementation Method 1
a power conversion unit receiving and converting power from a power grid
Implementation Method 2
An energy storage system (ESS) is a system that stores electricity in a battery and the like
Implementation Method 3
a sensor network implemented to perform power flow judgment and management of an entire system
Data Source
AI summary
A method for electric vehicle (EV) charging includes receiving power from at least one of a power grid and an energy storage system; performing an EV charging procedure through a charger using the received power; and performing, during the EV charging procedure, one of enabling charging the energy storage system from the power grid, and switching from discharging to charging of the energy storage system. An EV charging system includes a secondary battery for charging/discharging; an input unit receiving power from a power grid in order to charge the secondary battery; an output unit providing the power grid power to a charger for charging an electric vehicle by discharging the secondary battery; and a control unit to control a state of charge of the secondary battery when EV charging starts and a state of charge of the secondary battery when EV charging ends and to perform the EV charging procedure.