Distributed Online Voltage Control for Wind Farms Using Generalized Fast Dual Ascent

Distributed Online Voltage Control for Wind Farms Using Generalized Fast Dual Ascent
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广义快速双上升风电场分布式在线电压控制

DOI:
10.1109/tpwrs.2020.2988123
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发表时间:
2020-11
影响因子:
6.6
通讯作者:
Wang Zhaoyu
Wang Zhaoyu
中科院分区:
工程技术1区
文献类型:
--
作者:
Guo Yifei;Gao Houlei;Wang Zhaoyu

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本文研究了风电场的电压控制问题,通过协调风力发电机和静态同步补偿器的无功输出,以保持可行的电压分布和足够的无功储备。本文提出了一种基于对偶分解的分布式在线电压控制方案,而不是传统的集中式离线电压控制方案。首先,建立了基于支路流模型的最优电压控制问题。然后,利用该问题约束的稀疏性,建立了基于对偶分解的分布式求解框架,并通过电压反馈实现了该框架的在线实现。为了追求分布式算法的快速收敛性,从而便于在线实现,将快速梯度法推广到对偶问题的求解中。在静态和动态两种情况下,对所提出的电压控制方案的有效性进行了数值验证。
This paper considers the voltage control problem in wind farms, with the goals of maintaining feasible voltage profile and adequate reactive power (VAR) reserves by coordinating the reactive power outputs of wind turbines (WTs) and static synchronous compensators (STATCOMs). Rather than a conventional centralized and offline fashion, we propose a distributed online voltage control scheme based on dual decomposition. First, the optimal voltage control problem is formulated based on the branch flow model. Then, thanks to the sparsity of the constraints in this problem, a distributed solution framework is developed based on the dual decomposition and its online implementation is achieved through voltage feedback. To pursue fast convergence of the distributed algorithm and consequently facilitate the online implementation, the fast gradient method is generalized and then applied to solve the dual problem. The effectiveness of the proposed voltage control scheme is numerically validated under both static and dynamic cases.
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