Electric Power ›› 2021, Vol. 54 ›› Issue (2): 104-112.DOI: 10.11930/j.issn.1004-9649.202001081

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Hierarchical and Partitioned Optimal Control of Distribution Networks Considering the Coordination Between Energy Storage and Distributed Generation Systems

ZHANG Ying1, KOU Lingfeng1, JI Yu1, YU Hui1, HU Zhuandi1, SUN Zhen’ao2   

  1. 1. China Electric Power Research Institute, Beijing 100192, China;
    2. Northeastern University, Shenyang 110819, China
  • Received:2020-01-16 Revised:2020-05-16 Published:2021-02-06
  • Supported by:
    This work is supported by Science and Technology Project SGCC (Research and Application of Distribution Network Flexibility Enhancement Technology Based on Distributed/Mobile Energy Storage, No.SGTJDKOODWJS1800008)

Abstract: The current distribution network is facing the challenge of large-scale distributed generation and diverse forms of energy storage being integrated into the distribution network, which has brought extreme complexity to the optimal management and control of distribution system. Inspired by the idea of layered optimization and partition coordination, a layered optimization system for distribution networks with regional autonomy and coordination among regions was proposed to achieve the purpose of system optimization after the integration of large-scale distributed generation into the bulk power grid. At the optimal dispatch layer, the dynamic mathematical model is established with the power exchange between each regions and the main power grid as the objective function. Then through the optimization coordinated by each regions, the large-scale distributed energy resources are connected to the grid smoothly and hourly schedules of the inter-region power exchange are obtained. At the control layer within the region, considering the discrepancies between the regulation capabilities of each distributed energy source, the dispatch order from upper layer is revised based on fuzzy control logic in combination with the energy storage system. Additionally the 5min ultra short term dispatch order is also issued for each region. At the unit control layer, real-time control is implemented based on PWM converter. Finally, the correctness and validity of the proposed strategy are verified by virtue of case studies with simulated calculations.

Key words: distribution system, distributed energy storage, distributed generation, hierarchical partitioning, optimized control