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Techno-economic analysis of using battolyser for primary frequency control in power system with wind power

Zilong Wang(1) and Ang Li(2)

1. Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong SAR Pokfulam, Hong Kong Island (Hong Kong)

2. Asset Management Department, CLP Power Hong Kong Limited, Hong Kong SAR, and Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong SAR Pokfulam, Hong Kong Island (Hong Kong)

2026-01-20

Large-scale integration of wind power brings newchallenges to the frequency stability of traditional power systems. The use of battery has become increasingly mature for frequency control. Recently, battolyser as a brand-new technology that combines the functions of battery and electrolyser, shows higher technical and economic potential owing to its hydrogen production ability. Regarding this, the authors conduct detailed calculation and simulation to quantify its performance in primary frequency control. Results are compared with battery under various wind power penetration ratios and state-of-charge (SoC) conditions. It is shown that battolysers are more competitive in primary frequency control with high share of wind power when it operates at a higher SoC with more expensive electricity.

Key words: Battolyser, primary frequency control, power system, wind power, battery.

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