Energy Storage Converter Control for Fast Grid Frequency Support
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Solution Overview
Problem
Existing energy storage systems face challenges in rapidly supplying or absorbing active power to stabilize grid frequency during imbalances, leading to potential large-scale power outages due to delays in responding to generator failures in low-inertia power grids.
Innovation Solution
An energy storage system with a power converter and control unit that detects active power variations and compensates by either outputting or inputting power to/from an energy storage device, enabling rapid adjustment to balance supply and demand.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If active power output is increased based on frequency deviation as in prior art, then frequency variation suppression is improved, but response speed to generator failure is insufficient causing delay in active power supply
Solution Approach 1:
The control unit pre-calculates and stores the relationship between active power variation and frequency variation before generator failure occurs. When failure happens, the system immediately retrieves and applies the pre-computed control amount based on detected frequency variation, eliminating the delay of real-time calculation and enabling instantaneous response while maintaining frequency stability.
2Loss of energy
If conventional frequency-based control is used, then excessive compensation is prevented, but active power cannot be supplied instantaneously after generator dropout
Solution Approach 1:
The invention introduces frequency variation amount as an intermediary parameter between generator failure and active power control. The control unit detects frequency variation, compares it with pre-stored reference values, and determines the control amount through this intermediary step. This approach enables faster response than direct frequency-based control while preventing excessive compensation through controlled comparison logic.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution allows for immediate compensation of active power imbalances, stabilizing grid frequency and reducing the risk of power outages by quickly supplying or absorbing power during steep frequency variations.
Implementation Method 1
at least one power converter provided between the power line and the at least one energy storage device
Data Source
AI summary
In an energy storage system connected to a power line of a power grid, electric energy is input and output to and from at least one energy storage device. At least one power converter is provided between the power line and the at least one energy storage device. A power detector detects active power flowing through the power line. A control unit controls an operation of the at least one power converter, thereby causing active power either to be output from the at least one energy storage device to the power line or to be input to the at least one energy storage device from the power line such that a variation in active power detected by the power detector is compensated.