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

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

1,* email, 1email, 1email, 2email and 1email
Received: 6 May 2013; in revised form: 13 July 2013 / Accepted: 18 July 2013 / Published: 6 August 2013
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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)
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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.

AMA 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(8):3951-3971.

Chicago/Turabian Style

Gu, Wei; Liu, Wei; Wu, Zhi; Zhao, Bo; Chen, Wu. 2013. "Cooperative Control to Enhance the Frequency Stability of Islanded Microgrids with DFIG-SMES." Energies 6, no. 8: 3951-3971.

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