Jayanand B
@scmsgroup.org
Professor, Electrical and Electronics Engineering
SCMS School of Engineering and Technology
RESEARCH, TEACHING, or OTHER INTERESTS
Electrical and Electronic Engineering, Energy Engineering and Power Technology, Renewable Energy, Sustainability and the Environment, Control and Systems Engineering
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Adhipa K R and Jayanand B
IEEE
The classic bridge inverter is outclassed by pulse width modulated voltage source inverters (PWMVSI), yet PWM inverters still face significant difficulties. Device restriction and significant switching loss cause major issues when power and voltage ratings increase. A variety of pulse width modulation techniques, including sinusoidal, third harmonic injection, and space vector PWM (SVPWM) use high frequency switching to provide high-quality output voltage with little ripple. In a multi-level inverter, increasing the number of active switches and passive components is necessary to raise the voltage levels. Compared to two-stage conversion, single-stage conversion has a more compact design, a better power density, and a cheaper cost. Two inverter topologies which produce sine wave output in single stage conversion are infinite level inverter and differential inverter. The infinite level inverter topology has a buck based active front end followed by an H-bridge. Differential inverters are single-stage, bidirectional DC-AC converters that can step up or down and invert the DC voltage. Three converters make up the majority of a differential inverter. Depending on the output needs, it can be a buck, boost, or buck-boost. The two converters are controlled so that the difference between their outputs produces an AC voltage at the desired frequency. In this paper infinite level inverter and buck converter based differential inverter is compared. Total switching device power, passive component requirement, and efficiency of each of these inverters were calculated. For purposes of comparison, both the inverters are given the same load, modulating signal and are operated from same DC voltage source to compare the losses and efficiency.
K. Smrithi and B. Jayanand
Elsevier BV
Uma Syamkumar and B. Jayanand
Inderscience Publishers
Uma Syamkumar and Jayanand B
IEEE
A smoothed Kalman filter trained recurrent neural network is proposed as an observer for sensorless vector control of three phase induction motor. Recurrent neural networks which are capable of online training is used here. The speed and flux are estimated using this observer for closed loop vector control. The proposed observer shows good performance in transient and steady state and also in variations in load and speed. Simulations are performed on a 0.75HP induction motor drive and results are compared with those of an extended Kalman filter trained recurrent neural observer.
Sivarajan K N, Nirmal S, Jasmin E.A, and B Jayanand
IEEE
The research paper presents a novel Dynamic Voltage Restorer (DVR) with differential inverter topology. It is a new member of the Custom Power Device (CPD) family. The load voltage maintenance is difficult when the power system is subjected to faults, sags, swells etc. The advantages of this DVR, which uses differential topology, over conventional DVR are the reduction in filter size and improvement of power quality of load voltage and current. The voltage stability and its maintenance is very important in distribution systems. This ensures the smooth functioning of all equipment connected in the distribution network. A scaled down DVR model is implemented, and verified by simulation and experimentation.
Hareesh A. and Jayanand B.
Institute of Electrical and Electronics Engineers (IEEE)
The design and performance analysis of an open-ended three-phase induction motor, driven by an Infinite Level Inverter (ILI) with its speed control using scalar and direct vector control techniques are presented in this paper. The ILI belongs to an Active-Front-End (AFE) Reduced-Device-Count (RDC) Multi-level Inverter (MLI) topology. The fundamental structure of this inverter topology is a dc-to-dc buck converter followed by an H-bridge. This topology performs a high-quality power conversion without any shoot-through issues and reverse recovery problems. The performance of the proposed topology is validated using a resistive load. The THD of output voltage waveform obtained is 1.2%. Moreover, this topology has exhibited a high degree of dc-source voltage utilization. ILI considerably reduces the switching and conduction losses, since only one switch per phase is operated at high frequency, and other switches are operated at power frequency. The overall efficiency of the inverter is 98%. The speed control performance of the ILI topology using three-phase open-ended induction motor has been further validated through scalar and direct vector control techniques. Results obtained from simulation studies are verified experimentally.
Sivarajan K N, Jasmin EA, and B Jayanand
IEEE
This paper presents Power Quality (PQ) problems and mitigation using D-STATCOM with H-Bridge topology in solar Photo Voltaic (PV) integrated distribution system. D-STATCOM solve current related issues of networks. Three-phase, four-wire, 400 V and 50 Hz system is selected as distribution source. The power quality improvement along with PV integration is intended by using D-STATCOM. Another goal is to design the components of shunt compensator for a PV integrated three phase distribution system. The Custom Power Device (CPD) is 50 kVA rated and uses battery storage system. Economical and robust design is ensured. Various loads were connected in the system for simulation studies and results were analyzed and validated.
K. T. Ajmal, K. Muhammedali Shafeeque, and B. Jayanand
World Scientific Pub Co Pte Lt
A novel Four Switch Infinite Level Inverter (FSILI) is proposed in this paper. In conventional multilevel inverters, as the number of levels increases the output voltage becomes more sinusoidal. Unlike conventional multilevel topologies, the output voltage level in the proposed topology depends upon the switching frequency. Since the switching frequency is very high, the output voltage level approaches infinity, thus the name Infinite Level Inverter. Proposed topology requires only one inductor and capacitor reducing the size, weight and thus cost of the overall system. Inherent buck operation is happening in the proposed topology with a sine varying duty ratio PWM control. Steady-state analysis and design of the inverter are carried out. The proposed topology is simulated using Matlab/Simulink to evaluate the theoretical analysis and operation. A hardware prototype is also developed to validate the operation of proposed FSILI.
Uma Syamkumar and B. Jayanand
Hindawi Limited
Neethu Elizabeth Michael, Suhara E. M, and Jayanand B
Springer Singapore
K Reshma, N.P Aiswarya, and B Jayanand
IEEE
Modern power systems have copious nonlinear loads, which immensely affect the quality of power supply. Commonly occurring power quality issues are voltage sag and swell, harmonics, etc. A new infinite level inverter (ILI) topology is introduced here to develop a dynamic voltage restorer(DVR) for soothing the voltage sag and swell problems. DVR with traditional modulation techniques like sine PWM, space vector PWM based bridge inverters have high DC link voltage requirement compared to the three-phase ILI. Harmonics in the output of ILI is reduced to a value less than one percentage. Three phase ILI mitigate voltage sag and swell problems effectively for different percentages of sag and swell. MATLAB/Simulink software is used for simulation and verification of results. Results are experimentally verified using scaled laboratory prototype.
V. Renukadevi, B. Jayanand, and M. Sobha
Hindawi Limited
S Nirmal, K. N Sivarajan, E A Jasmin, M Nandakumar, and B Jayanand
IEEE
Optimized operation of grid-tied DC microgrids requires the application of an efficient current control strategy. Proportional resonant (PR) control is found to be one of the suitable control schemes to regulate grid currents in grid connected Voltage Source Converters. The paper focuses on achieving minimal steady state error between the desired and actual values of the series injected grid currents in the system. An additional advantage of selective harmonic compensation enhances the employability of this new breed of controllers. Tracking converter reference currents in the stationary reference frame is investigated to cancel out the shortcomings encountered while using conventional method comprising proportional integral controllers. Simulation research is carried out on the specified control area and a detailed discussion of both analytical and simulation results are presented. Simulation results furnished validate the test system connected to a linear inductive load when synchronized with the AC main power grid.
P S Athira, V Renukadevi, and B Jayanand
IEEE
Ideally, the goal of power industry is to supply a purely sinusoidal voltage at fixed amplitude and frequency. This paper presents a three phase Infinite Level Inverter(ILI) based DSTATCOM for harmonics and reactive power compensation. Its high DC link utilization reduces overall voltage stress across the device and hence improved power quality. It uses well established synchronous reference frame (SRF) strategy to generate current references. Mathematical and simulation modeling is carried out in MATLAB/Simulink environment using Simpower systems library. Hardware realization of a three phase infinite level inverter and single phase infinite level inverter based DSTATCOM is done using simulink real time windows environment.
S Nirmal, K. N. Sivarajan, E A Jasmin, M Nandakumar, and B Jayanand
IEEE
Design of a stable microgrid tied to the ac power grid requires an efficient, coordinated and controlled system operation. Energy management, power exchange, stability, reliability and protection are the key factors that necessitates extensive research on micro grids and their interconnection. This paper reviews the conventional method of controlling the output current injected by the grid connected voltage source converters to the ac power system. Modified synchronous reference frame control strategy is implemented using discrete PI controllers. The drawback of conventional SRF scheme is overcome in the new method. A detailed discussion of both analytical and simulation results obtained for linear inductive loads is included in this paper. Selection of the appropriate control strategy depends on the required system stability and power quality. The future scope for separate control on both active and reactive power is also investigated through analytical observations. Simulation results obtained validate the test system in case of linear balanced loads.
Uma Syamkumar and B. Jayanand
IEEE
In this paper, a single-stage smoothing filter algorithm is used for the speed-sensorless field-oriented control of induction motors and is verified experimentally. Two well-known flux models of induction motor are used for estimation of rotor flux and speed. The uncertainties in measurement and model are accounted for. The experiment is carried out on a closed loop field-oriented control system. An estimate of the state variables in the next instant is made, using the conventional extended Kalman filter (EKF). This estimate is used to smoothen the estimate of the previous instant. This refinement is found to improve the estimates of the previous and next instances, since an additional data point is made use of. Using the measured stator phase voltages and currents, speed is estimated. The results are compared with those with the Extended Kalman Filter. The algorithm is found to make improvement in the transient part of response of the system, for the same values of process and measurement error covariances. The performance of the system for different reference speeds is also analyzed. It is observed that the transient performance is improved and estimation remains good for a range of values of process and measurement error covariances.
K Smrithi, Sharun Vittappan, and B Jayanand
IEEE
In this paper reactive power compensation using an infinite level inverter based STATCOM is proposed. Nowadays, the society is becoming increasingly dependent on the electrical supply. New equipment's are more sensitive to power quality variations. This causes the transmission line to transfer equal or sometimes more than its capacity, which leads to overloading, voltage fluctuations etc. in the system. FACTS devices are developed to mitigate these problems. This will reduce the power quality problems by controlling the active and reactive power flows in the transmission line. STATCOM is normally used for reactive power compensation; hence power factor can be improved. This new converter topology helps to minimize conduction and switching losses and hence to improve efficiency the voltage variation in the transmission line is also mitigated with the help of STATCOM. Simulation using Mat lab Simulink are included.
A Hareesh, B. Manisankar, and B. Jayanand
IEEE
A novel structure of Three Phase Infinite Level Inverter (TILI) topology has been derived from elementary Single Phase ILI (SILI). The rudiment structure of this topology is a DC-to-DC Buck converter followed by a H-Bridge. Fully rectified SPWM (FrSPWM) technique is used as control logic for implementing sinusoidally varying duty ratio delta (d). The proposed topology is compared with traditional inverter topologies and it is proved that the new topology requires minimum amount of DC bus voltage (i.e. for generating 415V RMS value of fundamental line voltage, DC Bus voltage required is only 339V). Only three high-frequency switches are required to realize TILI. To validate the system capability of DC Bus utilization, SVPWM technique has been implemented by hardware in TILI topology (here for generating 415V RMS value of fundamental line voltage, DC Bus voltage required is only 293V). The performance of newly introduced TILI topology has been validated with different load conditions such as resistive load, Three Phase Induction Motor (TPIM) load and the compatibility of TILI is verified for above applications through hardware implementation and analysis. To verify the driving capability of the TILI, speed control experiments were conducted by V/f method and implemented through hardware and its dynamic performance of operations were validated.
Uma Syamkumar and B. Jayanand
IEEE
In this paper, a single- stage smoothing filter algorithm is used for the speed- sensorless field-oriented control of induction motors and is verified experimentally. A fifth-order model of the induction machine (IM) is used for the estimation of rotor currents and speed. The uncertainties in measurement and model are accounted for. The experiment is carried out on a closed loop field- oriented system. An estimate of the state variables in the next instant is made, using the conventional extended Kalman filter (EKF). This estimate is used to smoothen the estimate of the previous instant. This refinement is found to improve the estimates of the previous and next instantces, since an additional data point is made use of. Using the measured stator phase voltages and currents, speed is estimated. The results are compared with those with the Extended Kalman Filter. The algorithm is found to make improvement in the transient part of response of the system. The performance of the system for different reference speeds is also analyzed. It is observed that the transient performance is improved and estimation remains good for a range of values of process and measurement error covariances.
Surya Susan Alex, Asha Elizabeth Daniel, and B. Jayanand
IEEE
This paper presents a discrete time reduced order extended Kalman filter (EKF) for state estimation of sensorless brushless DC (BLDC) motors. Permanent magnet brushless DC motors are widely used in industries as they possess high power density and simplicity in control. The drawbacks of position sensors can be avoided by sensorless scheme. An extended Kalman filter based sensorless method is considered in this work. Computational burden of the full order Kalman filter can be minimized by a reduced order model. In this paper an extended Kalman filter algorithm is implemented using a reduced order discretized state space model which estimates the rotor speed and rotor position from the measured stator currents. The order reduction minimizes the computational time of the filter and also greatly simplifies the tuning of the covariance matrices. The reduced order filter performance is compared with that of full order filter with respect to the speed and position estimation, execution time of the filter and tuning of the algorithm.
Martin Cheerangal Joy and Jayanand B
IEEE
Traditional voltage source inverter (VSI) used to drive a three phase induction motor (IM) is a two level inverter. Various control techniques are employed to improve the DC-link utilization and to reduce the DC-link voltage. Lower DC-link voltage reduces the voltage stress across active switches and passive elements, thereby increasing the inverter reliability. Multi-level inverters are used in medium and high voltage IM drives to reduce voltage stress and harmonic content but the tradeoff is in the complexity of control circuit and increased number of active & passive elements. A new type of VSI drive called three-phase infinite level inverter (ILI) based IM drive is proposed to mitigate the above problems to a great extent. This modified VSI topology fed to IM has many number of voltage levels with same number of components. This drive requires only 0.576 times the DC-link voltage compared to space vector PWM inverter fed IM drive. No dead time requirement, low voltage stress and high DC-link utilization are the various advantage of this drive. Increasing number of voltage levels demands no extra devices in the circuit. Simulation using MATLAB/Simulink is presented to verify the above results. Experimental waveform obtained with the generation of voltage waveforms from the infinite level inverter and fan type load is shown.
Martin Cheerangal Joy, Chaithanya V, and Jayanand B
IEEE
Traditional 2-level voltage source inverter (VSI) based active power filters (APF) has a high DC voltage across the capacitor. A pure APF connected to a 3-ϕ 400V line voltage, will have a DC voltage of more than 600V for its effective working. Active switches in the inverter subjected to this voltage, results in a high voltage stress. Multi-level inverter topology in APF reduces the voltage stress and harmonic content to a greater extend but the tradeoff is more number of active & passive devices and complex control circuitry. A new type of VSI topology called 3-ϕ infinite level inverter based active power filter is proposed to mitigate the above problems to a larger extent. This topology has many number of voltage levels depending on the carrier frequency with same number of components. DC-link voltage is reduced due to low harmonic content and high utilization of DC voltage. Thus the voltage across the capacitor & active switches are low and thereby the voltage stress is considerably reduced. Instantaneous reactive power theory control technique (IRPT) or PQ Theory is used for fundamental reactive power compensation and harmonic filtering. Computer simulation using MATLAB/Simulink is presented to verify the above results. Experimental waveform obtained with the generation of voltage waveforms from the infinite level inverter is shown.
Martin Cheerangal Joy, Chaithanya V., and Jayanand B.
IEEE
Pulse width modulated voltage source inverters (PWM-VSI) have many advantages over the traditional bridge inverters; yet there are some challenges encountered by PWM inverters. As power and voltage rating increases; device constraint as well ashigh switching loss creates serious problems. Various pulse width modulated strategies like sinusoidal; 3rd harmonic injection and space vector PWM (SVPWM) employs high frequency switching to obtain quality output voltage with less ripple. Increasing number of voltage levels in a multi-level inverter requires an increase in number of active switches and passive elements. The problem of dead time requirement and shoot-through in PWM inverters distorts the output waveform and transfers less energy to load. A new type of three-phase VSI called three-phase Infinite Level Inverter (ILI) is proposed to mitigate all the above problems to a large extent. The device constraint and switching loss at high frequency is substantially reduced due to lower input DC supply. To get same output voltage; the proposed inverter requires only half of the DC link voltage compared to sine PWM inverter. Also; ILI takes only 0.576 times the input DC voltage compared to 3rd harmonic-injection or SVPWM. This shows that the proposed inverter has the maximum DC link utilization. The number of active switches and passive elements are same for any number of voltage levels. This topology is a multi-level inverter as there are many levels in the output voltage. Shoot-through problem is avoided and thus the proposed inverter doesn't need a dead time; leading to a better system reliability. Hysteresis current control is used for closed loop control. Results obtained from experimental setup and computer simulation using MATLAB/Simulink are presented to verify the above scheme.
Greeshma Nadh, Uma Syamkumar, and B Jayanand
IEEE
Vector control of induction motor is preferred as it gives independent control of flux and torque. For vector control knowledge of flux and speed is required. To eliminate the sensors, observers are used to estimate the flux and speed rather than measuring it. Sliding mode approach is popular due to its robust nature and very suitable for nonlinear system. This paper designs a sliding mode observers for speed control of induction motor. The sliding mode observer is verified experimentally. The experiment is carried out on a closed loop system consisting of induction motor, PI controller and the proposed estimator.