Strategy for tracking maximum efficiency of a expander-generator system of compressed air energy storage

doi:10.12028/j.issn.2095-4239.2016.0028

Abstract

Abstract: The speed of generator is adjusted through the gearbox in traditional compressed air energy storage (CAES) technology, thus enables the output of the generator to meet the demand. However, the expander does not always work in accordance with the maximum efficiency point when flowrate changes in such a configuration. Furthermore, the use of the gearbox leads to increased system loss, footprint and maintenance cost, and reduced system efficiency. This work considers the use of a converter instead of a gearbox due to the flexibility of speed control and power control capability of the converter, and control strategy for tracking the maximum efficiency point of the expander-generator system. Such a strategy takes into account heat, gas and electricity, and is based on the similarity theory. A model is built for the expander-generator system and simulation using the model shows that converter has the expected flexible control ability and the expander-generator system can operate stably under different grid requirements. At the same time, the speed control can be done using the real-time tracking as reference value, making the expander work at the highest efficiency under different power demands and expander-generator system operate under the best working conditions.

Key words: expander-generator system, control strategy, back-to-back PWM converter, CAES

SONG Jie1, ZHAO Bo1, LIANG Danxi2, LIU Haijun1. Strategy for tracking maximum efficiency of a expander-generator system of compressed air energy storage[J]. Energy Storage Science and Technology, 2017, 6(1): 154-161.

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