Cooperative Control to Enhance the Frequency Stability of Islanded Microgrids with DFIG-SMES

Wei Gu, Wei Liu, Zhi Wu, Bo Zhao and Wu Chen
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Wei Gu: School of Electrical Engineering, Southeast University, Nanjing 210096, China
Wei Liu: School of Electrical Engineering, Southeast University, Nanjing 210096, China
Zhi Wu: School of Electrical Engineering, Southeast University, Nanjing 210096, China
Bo Zhao: Zhejiang Electric Power Test and Research Institute, Hangzhou 310000, China
Wu Chen: School of Electrical Engineering, Southeast University, Nanjing 210096, China

Energies, 2013, vol. 6, issue 8, 1-21

Abstract: The issue of frequency stability of microgrids under islanded operation mode and mode transfer has attracted particular attention recently. In this paper, a cooperative frequency control method, which consists of a microgrid central control (MGCC) and microgrid local control (MGLC), is proposed to achieve a seamless transfer from grid-connected to islanded mode, and hence increase the frequency stability of islanded microgrids during both primary and secondary frequency control. A power deficiency prediction and distribution method is proposed in MGCC to effectively distribute and utilize the power and loads, and accomplish the cooperative control of all microgrid units. With regards to MGLC, a Hopfield fuzzy neural network control (HFNNC) is applied to make the corresponding frequency control of DFIG-SMES more adaptive. Meanwhile a state of capacity (SOC) control is utilized in battery energy storage (BES) to extend battery life. Simulation results indicate that the proposed frequency control approach can maintain the frequency stability of islanded microgrids even in emergency conditions.

Keywords: cooperative control; DFIG-SMES; microgrid central control (MGCC); microgrid local control (MGLC); Hopfield fuzzy neural network control (HFNNC); state of charge (SOC) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2013
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (10)

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