Power Grid Stabilization Using Segmented Electrical Ranges
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Solution Overview
Problem
Power grids with connected energy storage systems face challenges in reliably characterizing their state and stabilizing against instability, as energy storage systems mask electrical variables indicative of grid conditions, making it difficult to identify and address faults effectively.
Innovation Solution
A method that uses two counters and distinct procedures to stabilize the power grid by defining specific ranges for electrical variables, allowing for automatic and software-based monitoring and intervention, including decoupling from higher-level grids when necessary, to rapidly stabilize the grid while avoiding excessive control-induced instabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If energy storage systems are connected to the power grid to ensure reliable electrical energy supply, then the power grid stability is improved, but the electrical variables become less indicative of the current state, making fault identification difficult
Solution Approach 1:
The patent segments the monitoring approach by creating two distinct evaluation ranges (first range for normal operation, second range for instability detection) instead of using a single threshold. This segmentation allows the system to differentiate between grid conditions caused by energy storage systems and actual faults, resolving the contradiction by enabling accurate fault identification while maintaining grid stability benefits.
2Reliability
If decentralized stabilization measures are implemented by selectively switching off consumers, then the power grid stability is improved, but the complexity of control and measurement increases
Solution Approach 1:
The patent changes the parameter approach by using electrical variable ranges with different weights instead of simple binary switching thresholds. The first range allows normal operation, the second range triggers instability procedures with incremented counters, and a third range triggers shutdown. This parameter-based approach simplifies control by providing clear, graduated response levels rather than complex decentralized switching decisions.
3Speed
If automatic stabilization procedures are implemented with multiple ranges and counters, then the response speed to grid instability is improved, but the risk of control-induced instabilities increases
Solution Approach 1:
The patent applies partial action by using a counter mechanism that increments with each instability detection but only triggers full stabilization procedures when the counter reaches a threshold. This allows the system to respond quickly to multiple minor disturbances by accumulating counter values, while avoiding excessive control actions that could cause instability. The counter acts as a buffer that filters out transient fluctuations while still enabling rapid response to sustained issues.
Data Source
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AI summary
A method and a device for stabilizing a power grid (110) are described. The method comprises defining a first range (242) for an electrical quantity (U, f) of the power grid (110) around a setpoint; defining a second range (244) for the electrical quantity, wherein the second range is larger than the first range and smaller than a third range (246); sensing the electrical quantity; and comparing the electrical quantity with the first and second ranges.Furthermore, the procedure includes: (a) if the electrical quantity is within the first range, characterizing the state of the power grid as a normal state (S0); (b) if the electrical quantity is outside the first and within the second range and the power grid is in a first or second operating state, calling a first procedure (P1) to stabilize the power grid, in which a first counter is incremented; and (c) if the electrical quantity is outside the second range, calling a second procedure (P2) to stabilize the power grid, in which a second counter is incremented.