Microgrid Energy Planning for Grid-to-Island Battery Reliability
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Solution Overview
Problem
Current microgrid energy management systems face inefficiencies in operating storage batteries and utilizing renewable energy during emergency states, leading to potential power shortages and waste of surplus energy.
Innovation Solution
An energy management system with a hardware processor configured as a mode identification unit, prediction unit, planning unit, and display interface, which predicts power demand and renewable energy output, creates facility operation plans, and optimizes power generation and storage battery usage to prevent battery exhaustion and efficiently utilize renewable energy, enabling seamless transitions between grid connection and isolated operation modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If load prediction is performed in normal state to prevent storage battery power exhaustion in emergency state, then power supply reliability is improved, but device complexity increases
Solution Approach 1:
The system performs load prediction and creates facility operation plans during the normal state (grid connection mode) before the emergency state occurs. This preliminary action prepares the storage battery charge/discharge schedules in advance, ensuring power supply reliability when the emergency state arrives without requiring complex real-time decision-making systems.
2Duration of action of moving object
If storage battery capacity is increased to supply power for longer time in emergency state, then duration of action is improved, but device complexity and cost increase
Solution Approach 1:
The system dynamically adjusts the storage battery charge/discharge schedules based on predicted load and renewable energy output. By optimizing the timing and amount of battery discharge according to actual conditions, the system extends the duration of power supply in emergency state without requiring excessive battery capacity, thus avoiding increased device complexity.
3Productivity
If renewable energy output is maximized without storage, then productivity is improved, but loss of energy increases due to waste of surplus energy
Solution Approach 1:
The system predicts renewable energy output in advance during grid connection mode and creates facility operation plans that schedule storage battery charging during periods of high renewable energy generation. This preliminary planning ensures that surplus renewable energy is captured and stored before it would otherwise be wasted, maintaining productivity while reducing energy loss.
Solution Approach 2:
The storage battery acts as an intermediary between renewable energy generation and load consumption. It absorbs surplus renewable energy when generation exceeds demand and releases energy when demand exceeds generation, enabling the system to maximize renewable energy utilization without wasting surplus energy, thus improving productivity while minimizing energy loss.
4Loss of time
If facility operation plan is created based on prediction results, then loss of time is reduced, but measurement precision requirements increase
Solution Approach 1:
The system creates facility operation plans based on predicted load and renewable energy output, which provides sufficient accuracy for operational decision-making without requiring extremely precise measurements. By accepting a reasonable margin of error in predictions, the system achieves timely plan creation and execution without imposing excessive measurement precision requirements that would increase system complexity.
Data Source
AI summary
An energy management system is disclosed. In the system, a mode identification unit identifies whether a microgrid is in a grid connection mode or in an isolated operation mode. A prediction unit predicts, during the grid connection mode, an amount of demand for electric power in the microgrid and an output amount of renewable energy. The prediction is performed for a case where the grid connection mode is continued and for a case where the grid connection mode is switched to the isolated operation mode. A planning unit creates a facility operation plan for the microgrid to be applied to the grid connection mode and the isolated operation mode. A display I/F unit displays, on a display device in the grid connection mode, operation information representing operation of the microgrid during the isolated operation mode.