Power Converter Dispatch Control to Suppress Storage Loss
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Solution Overview
Problem
Existing power storage systems experience increased power loss due to the operation of multiple power conversion devices regardless of load requirements, necessitating a method to suppress this inefficiency.
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 a priority list, and transmits operation commands to selected devices while setting others to standby, optimizing power conversion operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If all multiple power conversion devices are operated regardless of load requirements, then the power storage system can supply power to the load, but the power loss increases due to unnecessary operation of power conversion devices
Solution Approach 1:
The control device determines the minimum number of power conversion devices required to meet the load demand and only activates that many devices. When load demand is low, fewer devices operate while others remain in standby mode, reducing unnecessary energy consumption while still meeting the power supply requirements.
Solution Approach 2:
The system dynamically adjusts the number of operating power conversion devices based on real-time load requirements. The control device continuously monitors the load and changes the operational state of power conversion devices accordingly, transitioning between active and standby states to optimize energy efficiency while maintaining power supply capability.
2Loss of energy
If the number of operating power conversion devices is reduced to suppress power loss, then energy efficiency improves, but the system complexity increases due to need for priority management and standby control
Solution Approach 1:
The control device pre-establishes a priority list for power conversion devices before operation begins. This priority list ranks devices in order of preference for operation, allowing the system to quickly determine which devices should be active without complex real-time decision-making, thereby simplifying the control logic while still achieving optimal energy efficiency.
3Ease of operation
If priority lists and state information are stored for multiple power conversion devices, then selective operation control is enabled, but the information storage and processing requirements increase
Solution Approach 1:
The control device maintains priority lists and state information specifically for the power conversion devices in the system, rather than implementing a universal control mechanism. This localized approach stores only the necessary information for each specific device (priority level and operational state), minimizing data volume while enabling precise selective control of individual devices based on their specific characteristics and current system needs.
Data Source
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AI summary
A power storage system is provided. The power storage system includes a plurality of power storage devices capable of discharging and charging direct current power; a plurality of power conversion devices connected to the plurality of power storage devices and a load; and a control device controlling a power conversion operation of the plurality of power conversion devices. The plurality of power conversion devices convert direct current power stored in the plurality of power storage devices into power corresponding to the load. The plurality of power conversion devices supply the power to the load based on the direct current power stored in the 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. Accordingly, a power storage system and a control device in which the power loss can be suppressed are provided.