EV Supply Equipment Switching Between Grid and Microgrid Voltage Control
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Solution Overview
Problem
Existing power management systems struggle to effectively manage voltage fluctuations in both power systems and microgrids, particularly in scenarios where load fluctuations occur.
Innovation Solution
A power management system that includes a microgrid with various power adjustment resources, such as electric vehicle supply equipment, generators, and power storage systems. This system employs a dual-server architecture where one server manages power adjustment resources within the microgrid for voltage stabilization and another server manages power supply and demand balance for the broader power system. The electric vehicle supply equipment executes charging and discharging operations when connected to a vehicle and reactive power compensation when not connected, under the control of the respective servers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the electric vehicle supply equipment executes charging and discharging operation to suppress microgrid voltage fluctuation, then the microgrid voltage stability is improved, but the ability to suppress power system voltage fluctuation is reduced
Solution Approach 1:
The control mode of the electric vehicle supply equipment is dynamically switched between charging/discharging operation and reactive power compensation operation based on real-time detection of vehicle connection status. When a vehicle is connected, the equipment performs charging/discharging to stabilize microgrid voltage. When no vehicle is connected, it switches to reactive power compensation to stabilize power system voltage, making the system adaptive to different operational conditions
Solution Approach 2:
The equipment changes its operational parameters based on the connection status of the vehicle. The control server switches between different control strategies: active power control (charging/discharging) when vehicle is connected, and reactive power control when vehicle is disconnected, thereby optimizing voltage stabilization performance for different scenarios
2Stability of the object's composition
If the electric vehicle supply equipment executes reactive power compensation operation to suppress power system voltage fluctuation, then the power system voltage stability is improved, but the ability to suppress microgrid voltage fluctuation is reduced
Solution Approach 1:
The control mode of the electric vehicle supply equipment is dynamically switched between charging and discharging operation and reactive power compensation operation based on real-time detection of vehicle connection status. When a vehicle is connected, the equipment performs charging or discharging to stabilize microgrid voltage. When no vehicle is connected, it switches to reactive power compensation to stabilize power system voltage, making the system adaptive to different operational conditions
Solution Approach 2:
The equipment changes its operational parameters based on the connection status of the vehicle. The control server switches between different control strategies: active power control (charging/discharging) when vehicle is connected, and reactive power control when vehicle is disconnected, thereby optimizing voltage stabilization performance for different scenarios
3Device complexity
If a single server manages both microgrid and power system voltage fluctuations, then the system complexity is reduced, but the effectiveness of voltage suppression in both scopes is deteriorated
Solution Approach 1:
The voltage control function is segmented into two independent servers: a first control server dedicated to microgrid voltage fluctuation suppression and a second control server dedicated to power system voltage fluctuation suppression. Each server independently manages its specific control objectives, avoiding interference between different control goals and improving overall control effectiveness
Solution Approach 2:
The electric vehicle supply equipment serves as an intermediary resource that can be allocated to different control servers based on operational conditions. The equipment receives control instructions from either the first server or the second server, enabling flexible resource allocation and coordinated voltage control across both microgrid and power system levels
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 proposed system effectively suppresses voltage fluctuations in both power systems and microgrids by dynamically allocating the electric vehicle supply equipment's functions based on its connection status to a vehicle, thereby optimizing power supply and demand balance.
Implementation Method 1
The electric vehicle supply equipment is configured to execute a charging and discharging operation that suppresses a voltage fluctuation of the microgrid by exchanging power between the microgrid and a vehicle
Implementation Method 2
The electric vehicle supply equipment is configured to execute a reactive power compensation operation that suppresses a voltage fluctuation of the power system by controlling reactive power of the microgrid
Data Source
AI summary
A power management system includes a first server configured to manage electric vehicle supply equipment in a microgrid and a second server configured to manage power supply and demand balance of a power system. The electric vehicle supply equipment is configured to execute a charging and discharging operation that suppresses a voltage fluctuation of the microgrid by exchanging power between the microgrid and a vehicle, and a reactive power compensation operation that suppresses a voltage fluctuation of the power system by controlling reactive power of the microgrid.