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Modular compressed air energy storage system for 5kw wind turbine: A feasibility study

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Abstract

This paper primarily focuses on a systematic top-down approach in the structural and feasibility analysis of the novel modular system which integrates a 5 kW wind turbine with compressed air storage built within the tower structure, thus replacing the underground cavern storing process. The design aspects of the proposed modular compressed air storage system (CAES) were executed to eliminate the multistage air compression process and overcome the adverse safety issues of underground caverns prevailing in the conventional system. Moreover, the waste heat treatment can be eliminated owing to its low-pressure operation (8 bar max) which reduces the complexity of the system. A detailed structural analysis was conducted for the foundation, tower structure, storage chamber and wind blades using the Structural Analysis and Designing Program (STAADPRO) and Analysis System (ANSYS) software for a basic wind speed of 180 km/hour (50 m/sec) as per the IS 875 (Part 3): 2015. Certainly, the results proved that the system remained stable at its natural and sub-harmonic frequencies. However, to ensure the feasible operation of the concept, a prototype model was tested for wind speeds starting from 3 m/s and was found to compress up to a maximum of 8 bar pressure.

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Abbreviations

A:

Swept rotor area (m2)

Am :

Area of foundation mat (mm2)

c:

Compression (kN)

CAES:

Compressed air energy storage

Cp:

Power Coefficient

D :

Blade diameter (m)

d:

Inner diameter of cylinder (m)

fN :

Natural frequency of tower

I L :

Transient peak current during starting(A)

K:

Stiffness of Tower (N/m)

M:

Mass of Structure with cylinder (kg)

N:

Shaft Speed (rpm)

Np :

No. of pile structures

Nm :

Motor speed (rpm)

P:

Internal pressure (bar)

Ρ:

Air Density (kg/m3)

Pa:

Pascal

Pcomp:

Pressure in compensating system (bar)

Pe :

Electrical power (W)

Qnu :

Soil capacity(kg/m2)

Qu :

Ultimate Pile bearing capacity(kg/m2)

R:

Radius of rotor

rpm:

Revolutions per minute

t:

Cylinder wall thickness (m)

T:

Tension (kN)

TSR:

Tip Speed Ratio

Tst :

Starting Torque (Nm)

V:

Actual Wind speed (m/s)

Vb :

Basic wind speed (m/s)

V L :

Line voltage (V)

Vz :

Design Wind speed (m/s)

W:

Wind Power (W)

WRA:

Wind Resource Assessment

σH :

Cylinder hoop stress (Pa)

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Funding

Received fund from National Institute of Wind Energy – R&D/ CF/GEN/WDASS/2017.

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Authors and Affiliations

  1. Department of Electrical and Electronics Engineering, KCG College of Technology, Chennai, India

    M. Ammal Dhanalakshmi & P. Deivasundari

Authors
  1. M. Ammal Dhanalakshmi
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  2. P. Deivasundari
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Correspondence to M. Ammal Dhanalakshmi.

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Ammal Dhanalakshmi, M., Deivasundari, P. Modular compressed air energy storage system for 5kw wind turbine: A feasibility study. Clean Techn Environ Policy 23, 2201–2212 (2021). https://doi.org/10.1007/s10098-021-02127-7

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  • DOI: https://doi.org/10.1007/s10098-021-02127-7

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