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Closed-loop Data-Enabled Predictive Control and its equivalence with Closed-loop Subspace Predictive Control
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Factors like improved data availability and increasing system complexity have sparked interest in data-driven predictive control (DDPC) methods like Data-enabled Predictive Control (DeePC). However, closed-loop identification bias arises in the presence of noise, which reduces the effectiveness of obtained control policies. In this paper we propose Closed-loop Data-enabled Predictive Control (CL-DeePC), a framework that unifies different approaches to address this challenge. To this end, CL-DeePC incorporates instrumental variables (IVs) to synthesize and sequentially apply consistent single or multi-step-ahead predictors. Furthermore, a computationally efficient CL-DeePC implementation is developed that reveals an equivalence with Closed-loop Subspace Predictive Control (CL-SPC). Compared to DeePC, CL-DeePC simulations demonstrate superior reference tracking, with a sensitivity study finding a 48% lower susceptibility to noise-induced reference tracking performance degradation.
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The Bias of Subspace-based Data-Driven Predictive Control
For LTI systems, the paper proves that closed-loop training data biases subspace-based predictive controllers (SPC, DeePC, gamma-DDPC), decomposes this into Subspace and Optimism Bias, and shows the Transient Predicto...
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