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Energies 2013, 6(8), 3951-3971; doi:10.3390/en6083951

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

1
School of Electrical Engineering, Southeast University, Nanjing 210096, China
2
Zhejiang Electric Power Test and Research Institute, Hangzhou 310000, China
*
Author to whom correspondence should be addressed.
Received: 6 May 2013 / Revised: 13 July 2013 / Accepted: 18 July 2013 / Published: 6 August 2013
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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. View Full-Text
Keywords: cooperative control; DFIG-SMES; microgrid central control (MGCC); microgrid local control (MGLC); Hopfield fuzzy neural network control (HFNNC); state of charge (SOC) cooperative control; DFIG-SMES; microgrid central control (MGCC); microgrid local control (MGLC); Hopfield fuzzy neural network control (HFNNC); state of charge (SOC)
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MDPI and ACS Style

Gu, W.; Liu, W.; Wu, Z.; Zhao, B.; Chen, W. Cooperative Control to Enhance the Frequency Stability of Islanded Microgrids with DFIG-SMES. Energies 2013, 6, 3951-3971.

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