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Applications that demand stringent conditions on output dc voltage ripple require models that can accurately predict the magnitude of ripple at the output voltage. The paper analyses the impact of dc input ripple on the output ripple for Series Resonant Converter (SRC) using discrete domain sampled data modelling method. The paper presents a novel discrete state space and small signal model for SRC...
An EV (Electric Vehicle) could play a prominent role in transport sector in terms of cost benefit and environment issues. A battery charger must have high efficiency and dependability with a unity power factor current drawn at its input AC mains since it is directly going to affect the charging time and life of the battery used in EV. Conventional AC-DC converter uses a diode bridge rectifier at the...
Unintentional islanding is one of the major concerns associated with integration of large solar photovoltaic generation with the power distribution network. However the issue of islanding needs to be comprehensively understood and managed given a challenging scenario ahead. This demands transition towards predictive approaches rather than the prevalent reactive ones for island detection and system...
In this paper, a comparative study of different harmonic elimination techniques has been adopted to mitigate the undesired dominant lower order harmonics from the output voltage of cascaded multilevel inverter. It has been shown that particle swarm optimization technique gives better result as compared to the mathematical theory of resultant and newton raphson method. Theoretical results are verified...
A three-phase induction motor emulator based on a bidirectional six-switch bridge-type power electronic converter is demonstrated. Two current control techniques in the abc-natural reference frame based on pulse-width modulation and hysteresis current control switching techniques are used and compared. The dynamic responses of the three-phase induction motor emulator during direct on-line start-up...
This paper focuses on determination of parameters like self inductance, mutual inductance, leakage inductance and coupling coefficient for a pair of helical coils for wireless power transfer applications. These parameters are important in designing and analyzing a wireless power transfer system based on the phenomenon of inductive/resonant inductive coupling. Here we present a simple approach based...
Several techniques have been developed to estimate the load parameters in power systems. Most of the algorithms mainly focus on estimating the parameters for offline studies. With ongoing smart grid development, high-resolution data at fast rates are available to allow load modeling in real-time. This paper addresses the challenges in online estimation of the load parameters using Phasor Measurement...
Approximate analytical solution of linear or nonlinear ordinary differential equations (ODE) can be obtained by Adomian decomposition (ADM) method. The nonlinearities in the ODEs are approximated by Adomian polynomials and a rapidly convergent sequence of approximate functions will be obtained as a solution. The ADM is widely used for numerical simulations of real-world systems in the applied sciences...
This paper proposes design of fractional-order controller for a 4-leg inverter using the concept of Bode's ideal loop transfer function. The 4-leg inverters have been increasingly used to cater nonlinear loads and hence there control is a crucial issue. The linear model of 4-leg inverter has poor phase margin resulting in a highly oscillatory time-domain response. The designed controller makes the...
In this paper the conventional ‘Delta’ connected TCR bank is split into two identical ‘Delta’ banks each having kVAr capacity half of the total TCR capacity. The study presented shows that such combination of two identical ‘Delta’ connected reactor banks, one with phase switching by thyristors and the other with line switching thyristor arrangement can effectively reduce the harmonic generation of...
The paper proposes a two input Switched Inductor Hybrid Buck-SEPIC DC-DC converter (TIHBSC) topology, for Low Voltage DC-grid (LVDG) applications. The projected topology is capable of providing extra bucking with one source. On account of excessive stepping down of the input dc voltage the converter uses additional energy storage components and hence it belongs to fifth order family. Power flow is...
1200 V SiC MOSFET is a viable alternative for state of the art Si IGBTs due to its superior switching performances. However, high di/dt and dv/dt during the switching transients worsen the switching performance of the SiC MOSFET due to the presence of parasitic inductances in the inverter layout. They cause undesired overshoot and oscillations in the device voltage and current. They also increase...
The power generated by a solar photovoltaic (SPV) system depends upon the solar radiation level and cell temperature. A suitable maximum power point tracking (MPPT) algorithm is required to extract the maximum power from the SPV. However at a partial shading condition (PSC) the conventional MPPT techniques may lead to the operation at a local maximum power point (LMPP) instead of global maximum power...
In this paper a novel three stage control for squirrel cage induction generator (SCIG) fed to standalone system through back to back converter is presented. In the proposed technique dc bus voltage controller is implemented to regulate the output voltage of the stand alone system. The voltage controller is generating the speed command of the speed controller followed by inner current controller. The...
Battery energy storage systems mitigate problems associated with source uncertainty inherent in renewable energy systems. Power generation acquire greater reliability when provided with storage systems. Energy management algorithms decide charging/discharging pattern of the storage. Unfitting approximation of losses being neglected in storage and converter systems lead to heavy losses within the system...
Inverter dead-time is known to make open-loop induction motor drives oscillatory, while operating at light-loads in particular. While dead-time compensation schemes exist, precise compensation of the same is often challenging as it involves factors such as device and driver delays and switching transition times, which are difficult to be quantified accurately. Hence, the effect of dead-time could...
In this paper a hybrid algorithm that monitors the voltage at the Point of Common Coupling (PCC) and dispatches the optimal power from battery integrated micro grid is proposed. The proposed architecture integrates a rule based dispatch and a predictive optimization algorithm and ensures optimal power dispatch with minimum voltage variations at the PCC. The methodology and the algorithmic flowchart...
In this paper, a discrete form of reduced order state observer for Doubly Fed Induction Generator (DFIG) is designed that estimates the machine states and rotor currents using stator voltage and power measurements. Further, the proposed state observer is used to provide a state feedback control strategy for Rotor Side Converter (RSC) of DFIG. The state observer and controller were tested on varying...
In this paper, a Square root Cubature Kalman filter (SCKF) is applied for speed and position estimation in the control of Interior Permanent Magnet Synchronous Motor (IPMSM). Cubature Kalman filter avoids the linearization errors prevailing in the Extended Kalman filter algorithm, and is much easier to tune than the Unscented Kalman filter. The square root version of the Cubature Kalman filter gives...
In this paper, a novel method for the digital implementation of one-cycle controller (OCC) is introduced for the control of AC-DC full-bridge converter. The use of this technique eliminates the need of high sampling rates for data acquisition or of using averaged input parameters for control, which is usually the case for digital implementation of OCC. Since, the instantaneous result of integration...
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