Distributed load-side control: Coping with variation of renewable generations
Distributed load-side control: Coping with variation of renewable generations
复制标题
分布式负荷侧控制：应对可再生能源发电的变化
DOI：
10.1016/j.automatica.2019.108556
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发表时间：
2019
期刊：
影响因子：
6.4
通讯作者：
Peng Yang
中科院分区：
文献类型：
--
作者：
Zhaojian Wang;Shengwei Mei;Feng Liu;Steven H.Low;Peng Yang
本文研究了考虑未知时变功率不平衡的多区域电力系统分布式频率控制问题。特别地，利用快速可控负载以最佳方式在变化的功率不平衡下恢复系统频率。将引起频率偏差的不平衡功率分解为三部分：已知的恒定部分、未知的低频变化和高频残差。已知的稳定部分通常是功率不平衡的预测。这种变化可能是由可再生资源的波动、电动汽车充电等引起的，这通常是操作员所不知道的。高频残差也是未知的，并被视为外部干扰。相应地，本文在不同的时间尺度上解决了以下三个问题：（1）经济地分配功率不平衡的稳定部分;（2）局部地减轻未知低频功率变化的影响;（3）衰减未知高频扰动。为此，提出了一种将一致性方法与自适应内模控制相结合的分布式控制器。我们首先证明了闭环系统是渐近稳定的，并收敛到优化问题的最优解，如果不包括外部干扰。然后，我们证明，可以准确地减轻功率变化。此外，我们证明了闭环系统对参数不确定性和外部干扰是鲁棒的。新英格兰系统被用来验证我们的设计的有效性。
This paper addresses the distributed frequency control problem in a multi-area power system taking into account of unknown time-varying power imbalance. Particularly, fast controllable loads are utilized to restore system frequency under changing power imbalance in an optimal manner. The imbalanced power causing frequency deviation is decomposed into three parts: a known constant part, an unknown low-frequency variation and a high-frequency residual. The known steady part is usually the prediction of power imbalance. The variation may result from the fluctuation of renewable resources, electric vehicle charging, etc., which is usually unknown to operators. The high-frequency residual is also unknown and treated as an external disturbance. Correspondingly, in this paper, we resolve the following three problems in different timescales: (1) allocate the steady part of power imbalance economically; (2) mitigate the effect of unknown low-frequency power variation locally; (3) attenuate unknown high-frequency disturbances. To this end, a distributed controller combining consensus method with adaptive internal model control is proposed. We first prove that the closed-loop system is asymptotically stable and converges to the optimal solution of an optimization problem if the external disturbance is not included. We then prove that the power variation can be mitigated accurately. Furthermore, we show that the closed-loop system is robust against both parameter uncertainty and external disturbances. The New England system is used to verify the efficacy of our design.