Molten Salt Frequency Modulation Task Split to Reduce Unit Wear
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Solution Overview
Problem
Molten salt energy storage systems in thermal power units face increased wear and reduced service life due to excessive task allocation during frequency modulation, particularly when Variational Mode Decomposition (VMD) is used at the last sequence, leading to inefficient task distribution.
Innovation Solution
A method and system that employs VMD to decompose power grid frequency modulation demands into high and low frequency components, applies fusion methods to high frequency components, and controls molten salt energy storage and thermal power units accordingly to optimize task distribution and reduce wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If VMD decomposition is applied at the last sequence to decompose frequency modulation demand, then the frequency modulation performance is improved, but the thermal power unit undertakes too many tasks which increases wear degree and reduces service life
Solution Approach 1:
The patent segments the frequency modulation tasks by decomposing the frequency modulation demand signal into multiple modal components using VMD, then categorizes these components into high-frequency components (suitable for energy storage) and low-frequency components (suitable for thermal power units). This segmentation allows the thermal power unit to undertake only appropriate tasks, reducing wear while maintaining overall frequency modulation performance.
2Ease of manufacture
If molten salt energy storage is used for frequency modulation, then cost is reduced and safety is improved, but the task allocation needs optimization to maximize performance
Solution Approach 1:
The patent dynamically optimizes task allocation between molten salt energy storage and thermal power units by calculating the central frequencies of different modal components and comparing them with the frequency modulation demand. The system dynamically determines which components should be handled by the energy storage device versus the thermal power unit, maximizing the utilization of the molten salt energy storage system's capabilities while maintaining cost-effectiveness and safety.
Data Source
AI summary
A frequency modulation method and system for a thermal power unit coupled with molten salt energy storage are provided. The method includes: decomposing the power grid frequency modulation response demand by VMD algorithm to obtain residual components and a plurality of modal components; calculating adjacent aliasing degrees of all the modal components, and dividing a high frequency modal component group and a low frequency modal component group based on an adjacent aliasing degree minimum value; if the high frequency modal component group only includes one modal component, equally dividing the residual components and the plurality of modal components into a high frequency group and a low frequency group according to central frequencies, and performing a plurality of fusion methods on modal components in the high frequency group to obtain different fused components.