Microgrid Power Adjustment Using Frequency-Split Load and Storage
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Solution Overview
Problem
The hydrogen production and storage system's slower response speed compared to storage batteries hinders its ability to absorb sudden fluctuations in renewable energy power generation, leading to potential imbalances in power supply and demand.
Innovation Solution
A power adjustment method that calculates an integration error between the control target and actual grid power, generating command values for both power consuming devices and storage devices based on low-frequency and high-frequency components of this error to manage power consumption and storage effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the hydrogen production and storage system is used to absorb power fluctuations, then the power balance can be improved, but the response speed is too slow to handle sudden fluctuations
Solution Approach 1:
The patent segments the power adjustment task into two distinct parts: a first command value for power consuming devices (hydrogen production system) and a second command value for power storage devices (storage battery). This segmentation allows each component to specialize in different aspects of power balance, with the storage device handling rapid responses and the consuming device handling sustained adjustments.
Solution Approach 2:
The patent applies partial action by having the power storage device handle only the high-frequency component of power fluctuations, while the power consuming device handles the low-frequency component. This division allows the storage device to provide rapid response without needing to handle all fluctuations, reducing its burden and allowing the slower hydrogen production system to operate at optimal capacity.
2Productivity
If the charging rate of storage battery exceeds the setting value, then more surplus power can be absorbed, but the hydrogen production and storage system cannot respond quickly enough
Solution Approach 1:
The control device acts as an intermediary that processes the integration error and separates it into high-frequency and low-frequency components. It then generates appropriate command values for each device type, mediating between the fast-responding storage battery and the slow-responding hydrogen production system to optimize their coordinated operation.
Solution Approach 2:
The patent implements dynamic control by continuously calculating the integration error between target and actual power values, and dynamically adjusting the command values sent to each device based on the current state of the system. This allows the system to adapt to changing conditions and optimize the response of each component in real-time.
Data Source
AI summary
A power adjustment method includes a step of calculating an integration error which is an error between a control target value of an integrated amount of grid power transmitted and received between an electric power system and a microgrid and an actual value of the integrated amount of the grid power, a step of generating a first command value for causing a power consuming device to consume power consumption on the basis of a low-frequency component of the integration error, a step of generating a second command value for causing a power storage device to charge and discharge charging/discharging power on the basis of a high-frequency component of the integration error, and a step of outputting the first command value to the power consuming device and outputting the second command value to the power storage device.