EV Charging Phase Switching for Three-Phase Grid Balance
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Solution Overview
Problem
The widespread adoption of electric vehicles and charging stations causes power grid imbalances due to stochastic charging demands, leading to inefficiencies and potential faults in transmission lines, as they draw single-phase power while the grid operates on three-phase alternating current.
Innovation Solution
A control method and system that dynamically switches the charging phase of each charging station in real time by collecting data, resetting phase allocations, sorting charging powers, and adjusting phase connections to balance the power grid loads, utilizing a data center to manage three-phase switching and output control at charging stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If charging stations maintain static single-phase charging, then the charging operation is simple and stable, but the power grid load becomes unbalanced causing negative-sequence and zero-sequence currents
Solution Approach 1:
The charging station dynamically switches between different phases (A, B, C) based on real-time power grid load conditions. The control system continuously monitors the sum of active powers on each phase and adjusts the charging phase accordingly, transforming the static single-phase charging into a dynamic multi-phase switching system to maintain power grid balance.
Solution Approach 2:
The system changes the operating parameter (charging phase) from a fixed state to a variable state. By monitoring the power grid load parameters and switching the charging phase based on the calculated phase selection value, the system adapts to changing grid conditions and maintains balance without requiring complex additional hardware.
2Reliability
If charging phases are dynamically switched in real time, then the power grid loads are balanced, but the control system complexity increases
Solution Approach 1:
The control system automatically monitors power grid load conditions and performs phase switching decisions without requiring manual intervention or complex external control. The system calculates the phase selection value based on real-time power data and autonomously switches phases to maintain balance, making the control process self-regulating and reducing overall system complexity.
Solution Approach 2:
The system implements a feedback mechanism where the control unit continuously monitors the active power on each phase, calculates the phase selection value based on this feedback, and adjusts the charging phase accordingly. This closed-loop control ensures power grid balance is maintained while using a relatively simple control structure that adapts to changing conditions.
Data Source
AI summary
The present disclosure relates to the technical field of electric vehicle charging management, in particular to a control method and system for charging balance of electric vehicle. The method includes: collecting data of each charging station; when a vehicle is connected to or disconnected from the charging station or a charging power of the charging station changes, resetting a pre-allocated power for electricity supply at each phase of a power grid; and switching the charging station to a phase of a corresponding power grid depending on a positive or negative value of the charging power.