基于最优潮流的交直流配电网分层控制策略

doi:10.3969/j.issn.1000-7229.2018.08.012

摘要/Abstract

摘要：

针对仅采用本地控制的交直流混合配电网难以优化系统运行状态的问题，提出了一种基于不同时间尺度的分层控制策略，将优化调度与本地控制结合起来。在较短的时间尺度内，第1层协调控制主、从换流站共同为配电网直流侧提供电压支撑；第2层通过切换各换流站的控制策略实现系统在恶劣运行状态下的二次电压恢复。在较长的时间尺度内，第3层优化调度系统以配电网总电能损耗最小和电压偏差最小为优化目标，通过最优潮流计算为下层提供调度指令。通过各层控制之间的协调配合优化系统运行状态，Matlab/Simulink仿真结果表明：该控制策略在各种工况下均能实现系统运行优化，且维持系统稳定不过分依赖调度系统，提高了配电网的可靠性。

关键词: 交直流混合配电网, 多目标优化, 分层控制, 协调控制

Abstract: Aiming at the problem that it is hard to realize operational optimization of hybrid AC/DC distribution network with only local control, this paper proposes a hierarchical control strategy with different time scales to combine local control with optimal dispatch. In a short-term scale, the first layer control enables to regulate DC voltage balance by means of coordinated control between converter stations. At the second layer, secondary voltage recovery in harsh operating condition is achieved by changing the control strategy of converter stations. As the third layer control, targeting minimum network loss and voltage offset, optimal energy dispatch system provides operation instructions for the lower control by optimal power flow calculation in a longer-term scale. Operating condition of network is improved by coordinated control between different layers. Simulation results in Matlab/Simulink show that this control strategy can realize operational optimization of network in various conditions and it does not rely on optimal energy dispatch system absolutely to remain distribution networks balance, which improves system reliability.

Key words: hybrid AC/DC distribution network, multi-objective optimization, hierarchical control, coordinated control

中图分类号:

TM 732

孟明，朱国林，魏怡. 基于最优潮流的交直流配电网分层控制策略[J]. 电力建设, 2018, 39(8): 94-101.

MENG Ming,ZHU Guolin, WEI Yi. Research on Hierarchical Control in AC/DC Distribution Network on the Basis of Optimal Power Flow[J]. Electric Power Construction, 2018, 39(8): 94-101.

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