Single Stage Grid-Connected Flyback Inverter with Optimal PID Controller for Harmonic Distortion Analysis

Sakthivel N. K.,Sutha S. 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.3

A successful zero-voltage switching scheme for a grid-tied single-stage flyback inverter, as well as the initiation of an Adaptive Fruit Fly Optimization (AFFO) algorithm based on PID Controller, has been put forward. To achieve soft switching, the grid side negative current follows the path of secondary bidirectional switches. As a result, the output capacitor of the MOSFET is discharged. To achieve Zero voltage, this function turns on the primary switch. As a result, optimising the reactive current level for zero voltage switching is critical. A PID Controller-based iteration of an Adaptive Fruit Fly Optimization (AFFO) algorithm is put forward. To provide soft switching, the grid side negative current follows the path of secondary bidirectional switches. As a result, the output capacitor of the MOSFET is discharged. This function activates the primary switch, causing it to turn on. At which the ZVS triggering takes place in the switches, with the adjustment of AFFO based PID controller’s parameters. An enhanced manner of PWM pulses is generated. The bidirectional switches in the primary and secondary sides of the flyback inverter are fed with pulses, thereby the switching losses are reduced by eliminating harmonics. The proposed work is designed with MATLAB/Simulink. A 24 V, 325-W prototype is performed to authenticate the proposed model.

Dissipativity based repetitive control for switched stochastic dynamical systems

Sakthivel, R.,Saravanakumar, T.,Kaviarasan, B.,Marshal Anthoni, S. Elsevier [etc.] 2016 Applied Mathematics and Computation Vol.291 No.-

<P>This paper addresses the issues of dissipativity analysis and repetitive control synthesis for a class of switched stochastic dynamical systems with time-varying delay. By using the lifting technique, the considered one dimensional model is converted into a continuous-discrete stochastic two dimensional delayed model to describe the control and learning actions of the repetitive controller. By employing stochastic system theory together with Lyapunov function technique, a new set of sufficient conditions in terms of linear matrix inequalities (LMIs) is established such that the switched stochastic system in two dimensional delayed model is mean square asymptotically stable and (Q, S, R)-dissipative. Then, the desired repetitive controller is designed by solving a convex optimization problem established in terms of LMIs. More precisely, repetitive controllers with H-infinity, passivity and mixed H-infinity and passivity performances can be obtained as the special cases for the considered system. Finally, numerical examples are provided to demonstrate the effectiveness and potential of the developed design technique. (C) 2016 Elsevier Inc. All rights reserved.</P>

Dissipative analysis for network-based singular systems with non-fragile controller and event-triggered sampling scheme

Sakthivel, R.,Santra, S.,Kaviarasan, B.,Venkatanareshbabu, K. Pergamon Press [etc.] 2017 Journal of the Franklin Institute Vol.354 No.12

<P>This paper investigates the problem of dissipative based non-fragile controller for network-based singular systems with event-triggered sampling scheme. Based on the Lyapunov-Krasovskii functional approach which fully uses the available information about the actual sampling pattern, a new set of sufficient conditions is obtained to guarantee that the closed-loop network-based singular systems are regular, impulsive free, asymptotically stable and strictly (Q, S, R)-theta dissipative. Moreover, a design algorithm for the desired controller with event-triggered sampling scheme is formulated in terms of linear matrix inequalities. By solving an optimization problem with some inequality constraints, the explicit expression of the non-fragile controller gain matrix is characterized to achieve the required result. Finally, two numerical examples are provided to demonstrate the effectiveness and superiority of the proposed control design scheme. (C) 2017 The Franklin Institute. Published by Elsevier Ltd. All rights reserved.</P>

Hepatoprotective and antioxidant effects of Monochoria vaginalis against acetaminophen-induced hepatotoxicity in rats

S Palani,S Raja,K Sakthivel,K Devi,B Senthil Kumar 경희대학교 융합한의과학연구소 2010 Oriental Pharmacy and Experimental Medicine Vol.10 No.1

The present study was aimed to investigate the hepatoprotective and antioxidant activities of ethanol extract from Monochoria vaginalis (250 mg/kg and 500 mg/kg B/W) on acetaminophen (APAP)induced rat hepatic injury. Monochoria vaginalis is a traditional medicinal plant that is commonly used to treat and improve liver conditions in India and other Asian countries. The development of hepatotoxicity induced by APAP is promoted by oxidative stress. APAP treated group significantly (P < 0.01) elevated the serum enzymatic levels like glutamate oxaloacetate transaminase, glutamate pyruvate transaminase, alkaline phosphatase (SALP), total bilirubin and malondialdehyde (MDA), which were restored towards normalization significantly (P < 0.01)thanol extract of yonochoria vagin is (EEMV). In addition, the EEMV significantly (P < 0.01)elevated the decreased level of total protein and antioxidant enzymes such as superoxide dismutase, catalase, glutathione peroxidase, glutathione-s-transferase and reduced glutathione. Apart from these, histopathological changes also showed the protective nature of the EEMV against APAP induced hepatic damage in liver tissues. The activity of EEMV at 500 mg/kg B/W was comparable to the standard drug silymarin (25 mg/kg B/W). In conclusion, these data suggest that the EEMV possess hepatoprotective and antioxidant effects against APAP-induced hepatotoxicity and oxidative stress in rats.

Vibration control of structural systems via robust non-fragile sampled-data control scheme

Sakthivel, R.,Aravindh, D.,Selvaraj, P.,Kumar, S.V.,Anthoni, S.M. Pergamon 2017 Journal of the Franklin Institute Vol. No.

<P>This paper investigates the dissipative non-fragile output feedback sampled-data control problem for uncertain structural systems. In the proposed system, uncertainties are assumed to be time-varying and bounded, which are considered in the linear fractional transformation form. The main objective of this paper is to design a non-fragile sampled-data controller such that the resulting closed-loop system is strictly (Q,S,R)-alpha-dissipative. On the basis of a suitable Lyapunov Krasovskii functional and linear matrix inequality technique, a new set of sufficient conditions is established to achieve the required result for both nominal and uncertain systems. In particular, an output feedback dissipative sampled-data controller is designed by solving a set of matrix inequalities. More precisely, Schur complement lemma, free weighting matrix approach and Wirtinger-based double integral inequality are utilized to substantially simplify the derivation of the main results. Finally, simulations based on structural systems are conducted to illustrate the effectiveness of the proposed control scheme. (C) 2016 The Franklin Institute. Published by Elsevier Ltd. All rights reserved.</P>

Synchronization and state estimation for stochastic complex networks with uncertain inner coupling

Sakthivel, R.,Sathishkumar, M.,Kaviarasan, B.,Marshal Anthoni, S. Elsevier 2017 Neurocomputing Vol.238 No.-

<P><B>Abstract</B></P> <P>This paper addresses the synchronization and state estimation problems for an array of coupled discrete-time stochastic complex networks (SCNs) with uncertain inner couplings in which time-varying delay is considered both in the network couplings and dynamical nodes. In particular, the uncertainties encountering in coupling terms are characterized by using the interval matrix approach. By constructing a suitable Lyapunov–Krasovskii functional and utilizing Kronecker product properties, a new set of sufficient conditions is established in terms of linear matrix inequalities to guarantee the synchronization of the addressed SCNs with a prescribed mixed <I>H</I> <SUB>∞</SUB> and passivity performance index. Moreover, the state estimation problem is then studied for the same SCNs with uncertain inner coupling strength and subsequently, the estimator is designed. More precisely, Schur complement, discrete-time Jensen’s inequality together with reciprocally convex combination approach are used to simplify the derivations in the main results. Finally, numerical examples are exploited to illustrate the effectiveness of the proposed synchronization and state estimation results.</P>

EID estimator-based modified repetitive control for singular systems with time-varying delay

Sakthivel, R.,Mohanapriya, S.,Selvaraj, P.,Karimi, H. R.,Marshal Anthoni, S. Springer Science + Business Media 2017 Nonlinear dynamics Vol.89 No.2

<P>This paper investigates the disturbance rejection for a modified repetitive control system (MRCS) that is described by a class of linear singular systems in the presence of external disturbances and time-varying delay. In particular, an equivalent-input-disturbance (EID)-based estimator is included in the MRCS to compensate both periodic and aperiodic disturbances which yields an EID-based MRCS. More precisely, the incorporation of the EID-based estimator into the control input enables rejection of all types of disturbances in MRCS and tracking of a periodic reference input is archived via a repetitive controller. Attention is focused on the state-feedback repetitive controller design which not only guarantees the regular, impulse free, and asymptotic stability of the closed-loop singular MRCS, but also provides an optimized upper bound of the time-varying delay. Based on Lyapunov stability theory and utilizing some advanced mathematical techniques, a new set of delay-dependent sufficient conditions is presented in terms of linear matrix inequalities for obtaining the required result. Then, an explicit expression for the desired state-feedback repetitive control law is developed. Further, the obtained results are validated through two numerical examples in the simulation section.</P>

Experimental and Analytical Study on the Bus Duct System for the Prediction of Temperature Variations Due To the Fluctuation of Load

Thirumurugaveerakumar. S,Sakthivel. M,Valarmathi. S 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.6

In this paper, a thermal model is developed for the bus bar system to predict the temperature variation during the transient time period and to calculate both the steady-state and transient electrical current carrying capacity (ampacity) of bus bar. The bus bar system installed in the power house of Kumaraguru College of Technology, Coimbatore has been considered. Temperature variation predicted in the modelling is validated by observing the current and steady state temperatures in different feeders of the bus bar. Magnetic field of the extreme phases R and B induces more current in the middle phase Y. Hence, the steady state temperature in the phase Y is greater than other two phases. The transient capabilities of the bus bar are illustrated by calculating the variations in the bus bar temperature when it is subjected to a step change in current during the peak hours due to increase in hostel utilities and facilities (5.30 pm to 10.30 pm). The physical and geometrical properties of the bus bar and temperature variation in the bus bar are used to estimate the thermal time constants for common bus bar cross-sections. An analytical expression for the time constant of the bus bar is derived.

Hepatoprotective and antioxidant effects of Monochoria vaginalis against acetaminophen-induced hepatotoxicity in rats

Palani, S.,Raja, S.,Sakthivel, K.,Devi, K.,Kumar, B. Senthil Kyung Hee Oriental Medicine Research Center 2010 Oriental pharmacy and experimental medicine Vol.10 No.1

The present study was aimed to investigate the hepatoprotective and antioxidant activities of ethanol extract from Monochoria vaginalis (250 mg/kg and 500 mg/kg B/W) on acetaminophen (APAP) induced rat hepatic injury. Monochoria vaginalis is a traditional medicinal plant that is commonly used to treat and improve liver conditions in India and other Asian countries. The development of hepatotoxicity induced by APAP is promoted by oxidative stress. APAP treated group significantly (P < 0.01) elevated the serum enzymatic levels like glutamate oxaloacetate transaminase, glutamate pyruvate transaminase, alkaline phosphatase (SALP), total bilirubin and malondialdehyde (MDA), which were restored towards normalization significantly (P < 0.01) thanol extract of yonochoria vagin is (EEMV). In addition, the EEMV significantly (P < 0.01) elevated the decreased level of total protein and antioxidant enzymes such as superoxide dismutase, catalase, glutathione peroxidase, glutathione-s-transferase and reduced glutathione. Apart from these, histopathological changes also showed the protective nature of the EEMV against APAP induced hepatic damage in liver tissues. The activity of EEMV at 500 mg/kg B/W was comparable to the standard drug silymarin (25 mg/kg B/W). In conclusion, these data suggest that the EEMV possess hepatoprotective and antioxidant effects against APAP-induced hepatotoxicity and oxidative stress in rats.

Synthesis and Characterization of Novel Crosslinkable Low Band Gap Polymers for Organic Photovoltaic Applications

N.S.S.CHAKRAVARTHI,안성광,P. Sakthivel,제갈영순,이재욱,진성호 한국고분자학회 2012 한국고분자학회 학술대회 연구논문 초록집 Vol.2012 No.4