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A cascade control strategy for electromagnetic capacity control system of reciprocating compressor.

Author(s) : ZHANG R., WANG Y., ZHANG Y., ZHAO D., ZHANG J., JIANG Z., LEI T., ZHOU M.

Type of article: IJR article

Summary

Reciprocating compressor is the key equipment in refrigeration system. The electromagnetic capacity control system plays an important role in energy conservation of the reciprocating compressor. The objective of this study is to design a control strategy that addresses several challenges, including large seating impacts, mismatch between load variations and actuator response capabilities, and insufficient robustness within the electromagnetic capacity control system. Firstly, a nonlinear model of the reciprocating compressor with stepless capacity control system is established. Secondly, an Integral Model Predictive Control-Adaptive Backstepping Integral Sliding Mode Control (IMPC-ABISMC) cascade controller is designed via three steps. Finally, the controller is comparatively tested. The results demonstrate that the control strategy can ensure that the reciprocating compressor buffer tank pressure is timely and accurately tracked the set value, reducing the steady-state error to a range of 0–0.13% and the expected load generated exhibits greater smoothness than that of Adaptive Fuzzy Sliding Mode Control (AFSMC). Additionally, the control strategy can control the actuator to track the target trajectory under different working loads with tracking accuracies of less than 0.09mm and maintains a low average seating velocity of 0.016m s-1, demonstrating strong robustness against the pressure disturbance and the load force disturbance. The innovation of this study lies in the design of the IMPC and ABISMC controllers, as well as the cascading of two controllers via intermediate transformation, forming a cascade control strategy that ensures precise load response while accommodating dynamic performance of the actuator. This control strategy is applicable to compressor experiencing frequent load variation, facilitating stepless capacity control and effectively addressing challenges such as excessive energy consumption.

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Pages: 200-213

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Details

  • Original title: A cascade control strategy for electromagnetic capacity control system of reciprocating compressor.
  • Record ID : 30033658
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 172
  • Publication date: 2025/04
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2025.01.019

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