HEMS Control Switching for EV Battery Charge Assurance
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Solution Overview
Problem
In power grids with multiple power balancing resources, including storage batteries, actual power supply and demand can deviate from planned values, potentially leading to insufficient charging of storage batteries when photovoltaic power generation falls short, which can impair user convenience.
Innovation Solution
A power management system that includes a controller for charging or discharging power balancing resources and a server for setting power management control. The system employs first and second control methods: first control follows a pre-developed power supply and demand plan, while second control adjusts based on actual surplus power and demand situations. When a prediction indicates that a storage battery's state of charge will be lower than a target at a scheduled time, the system switches from second control to first control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If second control (controller-based autonomous control) is used to allow flexible power management based on actual situations, then ease of operation is improved, but reliability deteriorates when actual power supply deviates from plan causing insufficient battery charging
Solution Approach 1:
The system dynamically switches between first control (server-based) and second control (controller-based) modes depending on the operational context. The server determines whether to grant autonomous control rights to the controller based on predicted power supply/demand deviations, enabling the system to adapt its control strategy in real-time to balance flexibility and reliability
Solution Approach 2:
The server continuously monitors actual power supply and demand against the power supply and demand plan, predicts potential deviations that would cause insufficient battery charging, and provides feedback by adjusting the control mode. This feedback mechanism ensures that autonomous control is only permitted when it will not compromise charging reliability
2Reliability
If first control (server-based control following power supply and demand plan) is used to ensure reliable power management, then reliability is improved, but adaptability deteriorates when actual situations deviate from predictions
Solution Approach 1:
The system transitions from static server-based control to dynamic controller-based autonomous control when conditions permit, allowing the system to adapt to actual power supply and demand situations that deviate from predictions while maintaining reliability through server oversight and conditional mode switching
Solution Approach 2:
The controller is empowered to autonomously manage power balancing resources without continuous server intervention when operating under second control, enabling the system to self-adjust to actual situations and improving adaptability while the server maintains overall system reliability through conditional monitoring
Data Source
AI summary
In the plan control, the control right of HEMS is held by the energy management server 2, and HEMS is controlled based on a power supply and demand plan developed in advance. The edge-control is such that HEMS controllers has a control right of HEMS and control HEMS based on the actual status of HEMS surplus power and power demand. HEMS includes an electrified vehicle (storage battery). The energy management server 2 switches the power management control from the edge control to the planning control when it is predicted that the actual SOC of electrified vehicle 12 is insufficient for the target SOC at the scheduled departure time of electrified vehicle during the execution of the edge control.