Sliding Mode Anti-windup Strategy for Mass Flow-Rate Regulation of Compressors with Rate-Limited Motors

Abstract

In this paper, the control of the mass flow-rate for a centrifugal compressor is discussed. The compressor is driven by a rate-limited actuating motor. To avoid integral windup, a sliding mode control (SMC) based anti-windup strategy is proposed. The developed scheme essentially avoids the integral windup of PI controllers by adapting the controller gain such that output of controller is not influenced by the rate limiter. Furthermore, a relay-based optimal tuning methodology for PI controllers in rate-limited systems is presented and discussed. Optimal tuning of the PI controller is done at different operating conditions of the compressor and used to create a gain schedule that provides a more robust control structure compared to standard manually tuned PI controllers.

Adaptive PI control with robust variable structure anti-windup strategy for systems with rate-limited actuators: Application to compression systems

“…In addition, although methods and strategies presented were developed for automotive fuel cell applications, they can be implemented in other nonlinear systems with ratelimit and magnitude constraints. Preliminary results of the work done in this paper are presented in [35]. This paper builds on it by refining and simplifying the AW strategy and analyzing its reduced order dynamics.…”

“…This paper builds on it by refining and simplifying the AW strategy and analyzing its reduced order dynamics. Furthermore, while [35] considers a single-input single-output system, this paper considers a multi-input multi-output compression system. Lastly, this paper supports the AW strategy and tuning methodology proposed via experimental results.…”