Power Converter Dispatch Control for Lower Storage System Loss
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Solution Overview
Problem
Existing power storage systems experience increased power loss due to the operation of all power conversion devices regardless of the load's power requirements, leading to inefficiencies.
Innovation Solution
A power storage system with a control device that determines the total active and reactive power output, prioritizes power conversion devices based on their states and capabilities, and transmits operation commands to a subset of devices while placing others in standby mode, using a priority list to optimize power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all power conversion devices are operated regardless of load requirements, then power supply reliability is improved, but power loss increases
Solution Approach 1:
The system segments the power conversion devices into multiple independent units, each capable of individual control. The control device selectively operates only the necessary number of devices based on actual load requirements, dividing the overall power conversion function into manageable segments that can be activated or deactivated independently to minimize power loss while maintaining reliability.
Solution Approach 2:
The control device determines the optimal number of power conversion devices to operate based on the actual power requirements. Instead of operating all devices (excessive action), it activates only the necessary subset (partial action), thereby reducing unnecessary power consumption and losses while still meeting the load demands and maintaining system reliability.
2Loss of energy
If a subset of power conversion devices is operated to reduce power loss, then energy efficiency is improved, but control complexity increases
Solution Approach 1:
The control device monitors and responds to changes in power parameters (active power and reactive power requirements) by dynamically adjusting the number and selection of operated power conversion devices. This parameter-based control approach automates the decision-making process, managing control complexity through systematic parameter evaluation rather than manual intervention.
Solution Approach 2:
The patent replaces manual or mechanical control methods with an automated electronic control system that uses calculation and logic to determine device operation status. The control device computes the necessary number of devices based on power requirements and automatically generates control signals, substituting complex manual control processes with streamlined electronic computation and automation.
3Measurement precision
If priority lists and state information are maintained for each device, then device selection accuracy is improved, but information storage requirements increase
Solution Approach 1:
The control device performs preliminary actions by pre-establishing priority lists and maintaining state information for each power conversion device before actual power conversion operations begin. This preliminary organization of device data enables rapid and accurate device selection when power conversion is needed, improving selection accuracy while the information is already structured and ready for efficient retrieval during operation.
Data Source
AI summary
A plurality of power conversion devices convert direct current power to load based on direct current power stored in a plurality of power storage devices. The plurality of power conversion devices convert power of the load into direct current power corresponding to the plurality of power storage devices. The plurality of power conversion devices charge the plurality of power storage devices based on the power of the load side. The control device includes a conversion device determination part determining the power conversion devices among the plurality of power conversion devices to which an operation command is to be transmitted. The conversion device determination part is configured to determine, based on the information related to the states of the plurality of power storage devices and the plurality of power conversion devices, a number of the power conversion devices to which the operation command is to be transmitted.