Hybrid journal (It can contain Open Access articles) ISSN (Print) 1755-9340 - ISSN (Online) 1755-9359 Published by Inderscience Publishers[438 journals]
Authors:Bharat Verma, Prabin Kumar Padhy Pages: 81 - 94 Abstract: A new proportional-integral-derivative (PID) control structure (PID<SUB align="right">F) for delayed processes is proposed in this paper. It consists of a derivative controller (D) in feedback with a standard proportional-integral (PI) controller. The proposed PID<SUB align="right">F controller improves the robustness with respect to time delay and de-noising capability. The proposed controller is similar to a PI controller with a low pass filter in series, which minimises the effect of high-frequency measurement noise. The robustness of the proposed PID<SUB align="right">F controller, with respect to the process-delay variation, is verified through simulation of four different processes and results are compared with standard PID controller. The parameters of PID and PID<SUB align="right">F controller are tuned by minimising the integral time square error (ITSE) objective function with the help of genetic algorithm. Keywords: robust control; linear control; dominant pole; PID controller; PIDF controller; delayed process Citation: International Journal of Systems, Control and Communications, Vol. 10, No. 2 (2019) pp. 81 - 94 PubDate: 2019-04-10T23:20:50-05:00 DOI: 10.1504/IJSCC.2019.098974 Issue No:Vol. 10, No. 2 (2019)
Authors:Abdelfetah Hentout, Abderraouf Maoudj, Mohamed Ouahal, Abdennour Gasmi Pages: 95 - 125 Abstract: This paper deals with fault-tolerance and formation control problems for homogeneous mobile robots under leader/follower failures by using the multi-agent paradigm. These issues are addressed by a cooperative approach supported by two kinds of agents: 1) <i>robot agents</i> (classified into a leader and a set of followers depending on their objective function), assigned to robots for collecting information, making decisions and transferring them to physical robots for execution; 2) <i>supervisory agent</i> (an interface between the control system and the team), synchronises and coordinates tasks of the other agents. These agents interact by a negotiation protocol to satisfy their objectives: 1) preserve predefined leader/follower formation; 2) conserve robots order inside the formation; 3) manage dynamic disturbance events (e.g., unexpected breakdown, integration of new robots). To validate this scheme and evaluate its performances, different simulations are examined by using ten robots evolving inside a grid environment cluttered with static obstacles with/without failures. Keywords: multi-agent control scheme; leader/follower line formation; fault-tolerance; homogeneous robot team Citation: International Journal of Systems, Control and Communications, Vol. 10, No. 2 (2019) pp. 95 - 125 PubDate: 2019-04-10T23:20:50-05:00 DOI: 10.1504/IJSCC.2019.098977 Issue No:Vol. 10, No. 2 (2019)
Authors:Mallareddy Mounica, Chinta Durga Prasad, Ravi Kumar Jatoth Pages: 126 - 146 Abstract: Automatic generation control (AGC) of an isolated power system is investigated in this paper. Performance analysis is carried out by considering the mutual coupling effect between load frequency control (LFC) and automatic voltage regulator (AVR) control loops by adding one fixed and one variable energy storage systems (ESS). The insertion of storage devices reduces the frequency oscillations for various load changes and also reduces the mutual effect of LFC and AVR. Simultaneous coordinated tuning of secondary controller and variable storage unit with particle swarm optimisation (PSO) and improved particle swarm optimisation (IPSO) is carried out to provide control strategy for the system. The system is simulated both in presence and absence of secondary controller in which IPSO gives better performance results than PSO. The simulation is carried out in MATLAB/Simulink software. Keywords: load frequency control; LFC; automatic voltage regulation; mutual coupling effects; energy storage systems; ESS; power compensation; particle swarm optimisation; PSO; improved PSO; settling time Citation: International Journal of Systems, Control and Communications, Vol. 10, No. 2 (2019) pp. 126 - 146 PubDate: 2019-04-10T23:20:50-05:00 DOI: 10.1504/IJSCC.2019.098973 Issue No:Vol. 10, No. 2 (2019)
Authors:Mohamed Hussein Moharam, Mamdouh Gouda, Hadia M. El Hennawy Pages: 147 - 175 Abstract: The first issue of this paper is to make particle swarm optimisation (PSO) on partial transmit sequence (PTS) and clipping methods not simultaneously to get optimal phase factor sets using two sub-block partition and select the optimum level of clipping ratio respectively in order to lessen PAPR. Second issue is to make PSO of hybrid PTS with clipping (PSO-H-CPTS) which is used for the reduction in FBMC/OQAM system. The last issue is describe the joint optimisation between PSO and Cauchy mutation with the hybrid clipping and PTS techniques which is produce best result than other proposed algorithms, the experimental results shows that EPSO-H-CPTS improve the results by 71.5% than conventional traditional PAPR in both clipping and PTS where the PAPR reached to a value 2.9 dB after using joint optimisation hybrid techniques. Keywords: FBMC/OQAM; orthogonal frequency division multiplexing; OFDM; particle swarm optimisation; PSO; clipping partial transmit sequence; C-PTS; EPSO-H-CPTS; peak to average power ratio; PAPR; complementary cumulative distribution function; Citation: International Journal of Systems, Control and Communications, Vol. 10, No. 2 (2019) pp. 147 - 175 PubDate: 2019-04-10T23:20:50-05:00 DOI: 10.1504/IJSCC.2019.098979 Issue No:Vol. 10, No. 2 (2019)
Authors:Shubhranshu Mohan Parida, Pravat Kumar Rout, Sanjeeb Kumar Kar Pages: 176 - 190 Abstract: This article presents a novel self-tuning proportional integral (ST-PI) controller for a grid connected wind turbine based on doubly-fed induction generator (DFIG) to regulate the active and reactive power under variable wind speed conditions. The gains of the controller are dynamically adjusted according to the error variation during transient conditions to damp the system oscillations faster with better settling time and lesser overshoot. They are designed to vary continuously according to the error based on tanh function logic within a pre-determined range. The proposed self-tuning controller is able to circumvent the problems usually associated during application of conventional PI controller with constant gain such as robustness, adaptability and wide range of operation. Simulation analysis and comparative studies with conventional PI controller reveal the efficacy of the proposed control scheme. Simulation is done for the system model to test the proposed approach using MATLAB. Keywords: proportional integral controller; PI; self-tuning PI controller; ST-PI; doubly-fed induction generator; DFIG; wind turbine; WT; distributed generator; DG Citation: International Journal of Systems, Control and Communications, Vol. 10, No. 2 (2019) pp. 176 - 190 PubDate: 2019-04-10T23:20:50-05:00 DOI: 10.1504/IJSCC.2019.098978 Issue No:Vol. 10, No. 2 (2019)
Hybrid journal (It can contain Open Access articles)
