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Grid-Constrained Distributed Optimization for Frequency Control With Low-Voltage Flexibility
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DOI：10.1109/TSG.2019.2926956.png)
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摘要
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Providing frequency control services with flexible assets connected to the low-voltage distribution grid, amongst which residential battery storage or electrical hot water boilers, can lead to congestion problems and voltage issues in the distribution grid. In order to mitigate these problems, a new regulation has been put in place in Belgium, imposing a specific constraint: in any circle with a radius of 100 m, there can be at maximum 10 connection points providing frequency control at any time. This paper presents an impact analysis and a coordination strategy of a flexibility service provider (FSP) that operates a pool of assets and is exposed to this new regulatory constraint. Results show that at 5 participation, only 90 of total control capacity can be used, with a large difference between neighbourhoods with different population densities. A distributed optimization framework to coordinate the assets arises naturally, in which the assets are able to keep their local cost functions private and only have to communicate with neighbouring assets that are geographically close, and with the FSP. Analysis of the proposed distributed optimization algorithm shows a clear trade-off between optimality gap, owing to the mixed-integer nature of the problem, and iterations to convergence.
Keyword:
ADMM
demand response
distributed control
distributed energy resources
frequency control
frequency reserves
mixed-integer programming
power system control
power distribution control
smart grid
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