Battery String Ratio Control for Solar Power Balance
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Solution Overview
Problem
Existing electricity storage systems fail to optimize charge and discharge power based on the balance between generated power and load consumption power, leading to potential excess or deficiency.
Innovation Solution
A storage battery control device and method that controls charge and discharge modes in an electricity storage system by predicting transitions in generated and consumption power, determining the ratio of storage batteries in discharge or charge standby states, and adjusting power flow through bidirectional power converters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If storage batteries operate independently with simple on/off switching control, then device complexity is reduced and ease of operation is improved, but charge and discharge power balance deteriorates leading to excess or deficiency
Solution Approach 1:
The patent divides the storage battery system into multiple independently controllable battery units, each with its own control device. This segmentation allows the system to achieve complex power balance control through coordinated operation of multiple simple units, resolving the contradiction between control simplicity and power balance effectiveness.
Solution Approach 2:
The patent implements dynamic control by continuously adjusting the charge/discharge state of individual batteries based on real-time power balance requirements. The control device dynamically determines which batteries should charge or discharge at any given moment, transforming static independent operation into dynamic coordinated control while maintaining operational simplicity.
2Device complexity
If all storage batteries operate in the same state (all charge or all discharge), then control complexity is reduced, but system adaptability to varying power balance requirements deteriorates
Solution Approach 1:
The patent segments the storage battery system into multiple independently controllable units, allowing different batteries to operate in different states (charge, discharge, or standby) simultaneously. This segmentation enables the system to adapt to varying power balance requirements without requiring complex centralized control of each individual battery.
Solution Approach 2:
The patent applies local quality by allowing each storage battery to have its own operational state determined by local control decisions. Different batteries can be in different states (charge, discharge, or standby) based on their individual roles in meeting the overall power balance requirements, enhancing system adaptability while keeping control complexity manageable.
3Speed
If storage batteries switch between charge and discharge states frequently, then responsiveness to power balance changes is improved, but switching losses and system stress increase
Solution Approach 1:
The patent implements preliminary action by maintaining some storage batteries in a standby state, ready to quickly switch to charge or discharge mode when power balance requirements change. This preliminary preparation reduces the need for frequent switching of the same batteries, thereby reducing switching losses while maintaining system responsiveness.
Solution Approach 2:
The patent uses dynamic state assignment where the control device determines which batteries should charge, discharge, or stand by based on real-time power balance needs. This dynamic allocation optimizes switching frequency by distributing load changes across multiple batteries, reducing individual battery switching frequency and associated losses while maintaining overall system responsiveness.
Data Source
AI summary
An electricity storage system controller executes a charge and discharge mode in which a part of the plurality of electricity storage strings is in a discharge state and the electricity storage strings other than the part are in a charge standby state, or a part of the plurality of electricity storage strings is in a charge state and the electricity storage strings other than the part are in a discharge standby state, and determines a ratio of the electricity storage strings in the discharge state to the electricity storage strings in the charge standby state or a ratio of the electricity storage strings in the charge state to the electricity storage strings in the discharge standby state, based on transition prediction information in which transitions of generated power of a solar power generation device and consumption power of a load connected to a power reception point are predicted.