Abstract
A wind-driven doubly fed induction generator (DFIG) along with the battery and pumped hydro storage plant (PHSP) has been devised for supplying isolated loads. PHSP-based storage system is economical and viable for the MW level wind-turbine system. The proposed scheme employs a squirrel-cage induction machine (SCIM) coupled with reversible pump turbine for PHSP. The battery storage is also included in this system to cope up with the intermittent nature of wind and fast-changing load. A simple control strategy has been implemented for maintaining the set values of voltage magnitude and frequency at the stator terminals of DFIG, which serve as a virtual grid for connecting ac loads and SCIM. Based on the availability of power in the wind, PHSP and battery, various operating modes of the proposed system have been clearly identified for supplying the isolated loads. These operating modes are clearly demonstrated through the analysis developed for this purpose and validated through experimental results. The salient features of the proposed system over the existing stand-alone wind-driven generators are (i) structural simplicity, i.e., employing only one power electronic converter, (ii) wide speed operation of wind-driven DFIG, (iii) reduced battery capacity, (iv) high energy storage using PHSP and (v) availability of continuous power to the isolated loads.
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Funding was provided by National Institute of Wind Energy Technology (NIWE) Under Ministry of New and Renewable Energy, Government of India.
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Appendix
Appendix
- A :
-
Stator-to-rotor turns ratio of DFIG
- E D, E S :
-
Per phase air-gap voltage of DFIG and SCIM, V
- f PCC :
-
Frequency at the PCC, Hz
- I L, I 1D, I 1S :
-
Per phase load and stator current of DFIG and SCIM, respectively, A
- I 12D and I 12S :
-
Per phase rotor current of DFIG and SCIM (referred to stator of DFIG and SCIM), respectively, A
- N RD and N RS :
-
Rotor speed of DFIG and SCIM, respectively, rpm
- N SD and N SS :
-
Synchronous speed of DFIG and SCIM, respectively, rpm
- P mD :
-
Mechanical power input to DFIG, kW
- P mS :
-
Mechanical power input to SCIM/mechanical power developed from SCIM, kW
- P L, P 1D and P 1S :
-
Real power at the PCC from load, DFIG and SCIM, respectively, kW
- R mD, R mS :
-
Per phase core loss resistance of DFIG and SCIM, respectively, Ω
- R, R 1D, R 1S :
-
Per phase load and stator winding resistance of DFIG and SCIM, respectively, Ω
- Q L, Q 1D and Q 1S :
-
Reactive power at the PCC from load, DFIG and SCIM, respectively, kVAR
- s D and s S :
-
Operating slip of DFIG and SCIM, respectively
- V dc :
-
Battery voltage, V
- V PCC :
-
Per-phase voltage at the PCC, V
- V 2D :
-
Per-phase rotor voltage, V
- X mD, X mS :
-
Per phase magnetizing reactance of DFIG and SCIM, respectively, Ω
- X, X 1D, X 1S :
-
Per phase load and stator winding reactance of DFIG and SCIM, respectively, Ω
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Navin Sam, K., Kumaresan, N. & Gounden, N.A. Wind-driven stand-alone DFIG with battery and pumped hydro storage system. Sādhanā 42, 173–185 (2017). https://doi.org/10.1007/s12046-017-0595-y
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DOI: https://doi.org/10.1007/s12046-017-0595-y