Microgrid Power Control for Reverse Flow and Load Fluctuation
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Solution Overview
Problem
Existing microgrid systems face challenges in managing reverse power flow, leading to potential power shortages and increased costs when load demand suddenly increases, as they often rely on stopping power generation to prevent reverse flow, which can result in inefficient energy distribution and higher operational expenses.
Innovation Solution
A power management system that includes a control unit and a power adjustment unit, which determine whether to reduce power generation and prioritize adjustments based on predicted load fluctuations, using multiple power generation devices such as photovoltaic and geothermal energy sources to manage power distribution effectively, ensuring that power is adjusted in descending order of priority to prevent reverse flow and maintain balance between generated and load power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If power generation from natural energy generators is stopped to suppress reverse power flow to the power system, then reverse power flow is prevented, but power shortages occur when load demand suddenly increases
Solution Approach 1:
The system performs preliminary actions by storing energy in the power storage device when power generation exceeds load demand, before reverse power flow occurs. This allows the system to have ready energy reserves to quickly respond to sudden load increases without stopping power generation or causing power shortages.
Solution Approach 2:
The power storage device acts as an intermediary between the natural energy generators and the power system. It absorbs excess power that would otherwise cause reverse power flow and releases stored power when load demand suddenly increases, mediating the power flow to prevent both reverse flow and power shortages.
2Object-affected harmful factors
If power generation is reduced to prevent reverse power flow, then reverse power flow is suppressed, but operational costs increase due to inefficient energy distribution
Solution Approach 1:
The control unit continuously monitors power generation amounts, load demand, and power storage device state, using this feedback information to dynamically adjust power generation and storage operations. This ensures energy is efficiently utilized by storing excess power rather than reducing generation, maintaining energy efficiency while preventing reverse power flow.
Solution Approach 2:
The power storage device serves as an intermediary that captures and stores excess energy that would otherwise be wasted or cause reverse power flow. This intermediary mechanism preserves energy efficiency by redirecting excess energy to useful storage rather than reducing generation or allowing wasteful reverse flow.
3Stability of the object's composition
If multiple power generation devices are used independently, then power generation stability improves, but complexity of power management increases
Solution Approach 1:
The control unit merges the control of multiple independent power generation devices into a unified management system. It coordinates power generation from different devices based on overall system conditions, load demand, and power storage state, simplifying management while maintaining the stability benefits of multiple independent generation sources.
Solution Approach 2:
The control unit performs multiple functions: it manages multiple independent power generation devices, monitors power storage device state, predicts future power generation and load demand, and executes coordinated control strategies. This multi-functional approach handles the complexity of managing multiple devices through a single integrated system.
Data Source
AI summary
An EMS includes a control unit that controls a power generation facility and a power adjustment unit that adjusts an amount of supply of supply power. The control unit includes: a reverse power flow suppression process determination unit; a priority decision unit that decides a priority for adjusting an amount of power generated for the two power generation devices of the power generation facility on the basis of a predicted degree of fluctuation in load power; and a device control unit that controls the power generation facility such that the amount of power generated is adjusted in descending order of the priority decided by the priority decision unit when the reverse power flow suppression process determination unit determines to reduce the amount of power generated by the power generation facility.