398 research outputs found
Generalized Data–Driven Predictive Control:Merging Subspace and Hankel Predictors
Data–driven predictive control (DPC) is becoming an attractive alternative to model predictive control as it requires less system knowledge for implementation and reliable data is increasingly available in smart engineering systems. Two main approaches exist within DPC: the subspace approach, which estimates prediction matrices (unbiased for large data) and the behavioral, data-enabled approach, which uses Hankel data matrices for prediction (allows for optimizing the bias/variance trade–off). In this paper we develop a novel, generalized DPC (GDPC) algorithm by merging subspace and Hankel predictors. The predicted input sequence is defined as the sum of a known, baseline input sequence, and an optimized input sequence. The corresponding baseline output sequence is computed using an unbiased, subspace predictor, while the optimized predicted output sequence is computed using a Hankel matrix predictor. By combining these two types of predictors, GDPC can achieve high performance for noisy data even when using a small Hankel matrix, which is computationally more efficient. Simulation results for a benchmark example from the literature show that GDPC with a reduced size Hankel matrix can match the performance of data–enabled predictive control with a larger Hankel matrix in the presence of noisy data.</p
Data-Driven Fast Frequency Control using Inverter-Based Resources
We develop and test a data-driven and area-based fast frequency control
scheme, which rapidly redispatches inverter-based resources to compensate for
local power imbalances within the bulk power system. The approach requires no
explicit system model information, relying only on historical measurement
sequences for the computation of control actions. Our technical approach fuses
developments in low-gain estimator design and data-driven control to provide a
model-free and practical solution for fast frequency control. Theoretical
results and extensive simulation scenarios on a three area system are provided
to support the approach.Comment: In proceedings of the 11th Bulk Power Systems Dynamics and Control
Symposium (IREP 2022), July 25-30, 2022, Banff, Canad
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