An oracle for the discrete-time integral quadratic constraint problem

Automatica ◽  
2019 ◽  
Vol 107 ◽  
pp. 112-118 ◽  
Author(s):  
Dany Abou Jaoude ◽  
Mark C. Palframan ◽  
Mazen Farhood
Keyword(s):  
Discrete Time ◽  
Quadratic Constraint ◽  
Time Integral ◽  
Integral Quadratic Constraint ◽  
Constraint Problem

scholarly journals Discrete–Time Integral Sliding Mode Control with Disturbances Compensation and Reduced Chattering for Pv Grid–Connected Inverter

2015 ◽  
Vol 66 (2) ◽  
pp. 61-69 ◽  
Author(s):  
Santolo Meo ◽  
Vincenzo Sorrentino
Keyword(s):  
Sliding Mode Control ◽  
Discrete Time ◽  
Control Algorithm ◽  
Sliding Mode ◽  
Integral Sliding Mode Control ◽  
Integral Sliding Mode ◽  
Mode Control ◽  
Time Integral ◽  
Grid Connected Inverter ◽  
Disturbances Compensation

Abstract In the paper a new discrete-time integral sliding mode control (DISMC) with disturbances compensation and reduced chattering for grid-connected inverter is proposed for active and reactive power regulation. Differently by many SMC proposed in literature that have a time-continuous formulation in spite have been implemented with digital processor, the proposed DISMC is fully formulated in discrete-time, taking into account the effects introduced by a microprocessor-based implementation. As will be demonstrated such approach consents to reduce the chattering about the sliding manifold within a boundary layer of O(T2) thickness instead of O(T) (being T the sampling period of the control algorithm). Moreover it introduces a correction of the control vector which eliminates the influence of modeling error and external disturbances improving stability and robustness of the controlled system. Constant converter switching frequency is achieved by using space vector modulation, which eases the design of the ac harmonic filter. In the paper, after a detailed formalization of the proposed control algorithm, several numerical and experimental results on a three-phase grid-connected inverter prototype are shown, proving the effectiveness of the control strategy.

Discrete-time integral servo with PID × (n-2)/2 stage PDA controllers for unstable systems

ICCAS 2010 ◽  
2010 ◽  
Author(s):  
Pittaya Pannil ◽  
Patsamol Chotechuangchutchawal ◽  
Thanit Trisuwannawat
Keyword(s):  
Discrete Time ◽  
Unstable Systems ◽  
Time Integral
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