Hierarchical hybrid control strategy for micro-grid switching stabilisation during operating mode conversion

作者：Dou, Chunxia^*; Li, Na; Yue, Dong; Liu, Tao

来源：IET Generation Transmission & Distribution, 2016, 10(12): 2880-2890.

DOI：10.1049/iet-gtd.2015.1256

• distributed power generation
• power generation control
• voltage control
• electric current control
• three-term control
• controllers
• Lyapunov methods
• hierarchical hybrid control strategy
• microgrid switching stabilisation
• operating mode conversion
• stabilisation performance
• microgrid operating mode conversion
• switching control strategy
• upper-level switching controller
• control modes
• PQ control
• micro-grid operating modes
• slave distributed generation
• PQ control mode

This study proposes a hierarchical hybrid control strategy to ensure stabilisation performance during the micro-grid operating mode conversion. Designing the hierarchical hybrid control strategy is divided into two stages. In the first stage, the research focuses on constructing a hybrid control scheme, where besides that the storage I unit needs to implement switching control strategy by means of an upper-level switching controller, the storage II unit that acts as a master unit also needs to be switched between two kinds of control modes including voltage-frequency droop control and PQ control in response to different micro-grid operating modes, and other slave distributed generation (DG) units operate in PQ control mode all the time. Moreover, during the operation mode conversion, according to the assessment indexes regarding voltage and frequency, the upper-level switching controller determines whether and when to send switching commands to the master DG unit. In the second stage, the research focuses on designing the hierarchical control strategies in the PQ control mode and the voltage-frequency droop control mode, as well as designing the upper-level switching controller to guarantee the stabilisation performance of the micro-grid during operation mode conversion. In the PQ control mode, all controllers are designed as a fractional order proportional-integral-derivative (FOPID) controller. Finally, the validity of the proposed hybrid control strategy is demonstrated by means of simulation results.

• 出版日期2016-9-2
• 单位南京邮电大学; 燕山大学; 中国科学院电工研究所