Storage Charge Current Control Logic for Grid Stability
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Solution Overview
Problem
The integration of renewable energy sources, such as photovoltaic systems, into electrical energy supply grids poses stability and capacity challenges due to unpredictable energy delivery, necessitating effective utilization of distributed energy storage units.
Innovation Solution
A facility for controlling charge current in storage units, utilizing a logic unit that determines storage charge current values based on control variables from a communication system, measurement variables, and internal control variables to optimize overall utilization of distributed energy storage, including specifications for local use and grid balancing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If distributed energy storage units are deployed to stabilize the electrical grid, then grid stability and capacity are improved, but the high cost of storage units and their limited local energy capacity create challenges for effective utilization
Solution Approach 1:
The storage unit is designed to perform multiple functions through a logic unit that can operate in different modes: charging from local distributed generators, charging from the electrical grid, discharging to local consumers, and providing grid balancing services. This multi-functionality allows a single storage unit to serve multiple purposes, effectively increasing its utility despite limited local energy capacity.
Solution Approach 2:
The logic unit continuously receives control variables from the communication system, measurement variables from the storage unit status, and internal control variables, then dynamically adjusts the charge current accordingly. This feedback mechanism ensures optimal utilization of the storage unit's limited capacity by making real-time decisions based on current grid conditions, local energy availability, and storage state.
2Productivity
If multiple use of storage units is implemented to reduce costs, then cost effectiveness improves, but optimizing overall utilization becomes more complex
Solution Approach 1:
The control system is segmented into distinct input sources (control variables from communication system, measurement variables from storage unit, internal control variables) and processing stages. The logic unit processes these segmented inputs through structured evaluation steps to determine charge current, making the complex optimization problem more manageable and systematic.
Solution Approach 2:
The logic unit dynamically changes operational parameters (charge current magnitude and direction) based on varying conditions including control variables, measurement variables, and internal state. This parameter adaptation allows the system to optimize storage utilization across different scenarios without requiring a completely different control approach for each case.
Data Source
AI summary
The invention essentially relates to a facility for charge current control of storage units in an electrical energy supply grid including, among others, distributed generators and distributed storage units, in which a logic unit is present such that, a storage charge current value can be determined for the storage unit as a function of control variables transferred via a communication system of measurement variables determined at the storage and of locally held internal control variables. This represents an important component for achieving the optimum possible overall utilization of the distributed and multiple-use energy storage.