Model Predictive Approaches for Active Surge Control in Centrifugal Compressors

Abstract

Model predictive control (MPC) techniques are considered for industrial centrifugal compression systems with nonlinear dynamics, to address process and antisurge control for reaching the desired pressure ratio and surge distance. We consider a contractive nonlinear MPC formulation that ensures asymptotic stability of the closed-loop system by imposing the decrease of a quadratic Lyapunov function via an additional constraint. We discuss recursive feasibility and estimate the region of attraction via numerical methods. We also consider alternative MPC formulations, including offset-free linear and nonlinear MPC to handle the effects of disturbances and unmodeled dynamics. The computational efficiency of an approximation based on sequential quadratic programming (SQP), that yields a closed-loop performance comparable to the full nonlinear MPC is also discussed. All of the controllers considered are tested in simulations that emulate a realistic test bench and their computational time is assessed on an industrial Programmable Logic Controller (PLC). Their performance is compared with standard industrial control in nominal and perturbed cases replicating the typical and critical disturbances and model mismatches. The numerical results show that the SQP and nonlinear MPC methods outperform the other controllers in the considered scenarios, based on closed-loop performance metrics for the surge margin, the reference tracking accuracy, and the system actuation, without significantly increasing the computational time

Metodologia FUZZY TOPSIS como Critério de Seleção de Fornecedores em uma Indústria Farmacêutica

“…Gráfico 5 -Avaliação pelo critério flexibilidade Fonte: os autores (2019) antecedência, pode fazer com que a empresa adote estratégias diferenciadas, como a busca temporária de outros fornecedores para não comprometer sua produção.…”

Model predictive control‐based eco‐driving strategy for CAV

“…Sequential quadratic programming algorithm is used to solve the optimal control problem for its effectiveness has been studied and proved in many MPC applications [27,28]. For that it is a non-linear control system, Taylor expansion is used to linearise the system.…”

Comparativo de desempenho entre softwares para minimizar a exposição ao ruído ocupacional utilizando PCV

“…Dessa forma, utiliza-se os valores de cada ponto que faz parte da rota de trabalho do funcionário para o cálculo da dose. A dose é uma ponderação entre o tempo de exposição e o tempo permitido de exposição para aquele nível de ruído sem ocasionar danos à saúde ocupacional, conforme Multee (2019).…”

“…A utilização de compressores centrífugos em processos de tratamento de Gás Natural é essencial, pois os compressores fornecem ao fluido a energia necessária para atender as necessidades do processo (TORRISI et al, 2017…”