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To improve the harmonic reduction ability in input line current of 12-pulse diode bridge rectifier (DBR) using zigzag autoconnected transformer with a dc side current injection technique is presented in this paper. Conventional 12-pulse rectifier does not meet the IEEE-519 standard and therefore current injection technique at dc side is used to shape the system current waveform to minimize the harmonic...
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...
This paper presents a photovoltaic (PV) integrated unified power conditioner (UPC) system that provides power quality enhancement as well as real power sharing. The shunt inverter of the PV integrated UPC system provides compensation for the harmonics present in the source current and reactive power while the series inverter compensates for voltage harmonics, voltage sags and swells. A novel control...
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...
This paper presents an active noise isolation (ANI) based control algorithm for single-phase single-stage solar photovoltaic (SPV) system connected to the AC grid. An ANI based algorithm used to control a voltage source inverter (VSI) which performs load compensation, harmonics mitigation, feeding solar power into the AC grid and many other power qualities issues. The proposed system comprises SPV...
Volts-per-hertz (V/f) controlled induction motor drive connected with LC filter may experience small-signal instabilities in different operating conditions and creates sustained oscillations in motor current, inverter current, motor voltage, developed torque and speed of the motor. This paper investigates the small signal instabilities of the drive at different speeds and load torques. This paper...
This paper describes a Sliding mode control (SMC) technique for a single - phase grid connected voltage source inverter (VSI) through LCL filter for distributed generation applications. SMC technique is applied as a control method with a fixed band hysteresis controller. Mathematical modeling of the VSI circuit is done through state space analysis. This control method provides robust current voltage...
In this paper, the attributes of the nonlinear load like power, power factor, harmonic and interharmonic frequency component, power spectrum and impulse responses are evaluated using correlation coefficients and Estimation of signal parameters via rotational invariance technique. This novel technique is established, also more useful in analyzing nonlinear load and designing the harmonic filters at...
This paper presents a new design strategy for S-LCC type compensation network in Inductive Power Transfer (IPT) systems. It was found that four resonant elements (three capacitors and one inductor) can compose two symmetric T type resonant tanks, which is well-known for its impedance transformation characteristic and reciprocity between voltage source and current source. A simplified analytical technique...
In this paper, the design of a proportional resonant (PR) controller for the packed U cell (PUC) 5 level inverter is presented. The objective of the presented work is to present a better solution for current control in grid connected application of the investigated topology. A suitable LCL filter is designed along with the PR control scheme for grid connection. Simulation is performed in MATLAB®/Simulink...
When an offshore wind power plant is connected to the grid, there is a risk of amplification of certain harmonics and appearance resonances at the point of connection due to the interaction between the grid network and the wind power plant network. Hence, the plant developer is obliged to maintain the harmonic distortion at the point of common coupling within the planning level limits using harmonic...
The DC onboard microgrid of a More Electric Aircraft (MEA) comprises of multiple Point Of Load (POL) converters to cater to diverse loads at different voltage levels. Lightly damped LC filters are typically used at the inputs of these POLs to reduce the noise in the system. Any tightly regulated POL acts like a Constant Power Load (CPL) and exhibits negative incremental impedance. The interaction...
This paper proposes a new circuit topology of MMC for DC to AC applications. The main advantage of the proposed topology is the elimination of lower arms of conventional MMC. Additionally, the DC bus voltage magnitude is half compared to conventional MMC. This is achieved by replacing the lower arms of conventional MMC topology with LC filter. The LC filter is designed to be a second order band stop...
This paper presents the performance analysis of a single phase UPQC (unified power quality conditioner) device with a left shunt APF (active power filter) configuration, termed as left shunt UPQC. This device is applied for a special load configuration. One set of load is voltage sensitive with considerable reactive power demand. The other set consist of load which is quite unaffected by voltage disturbances...
A model predictive current control (MPCC) of shunt active power filter (SAPF) requires tracking of distorted reference current based on the discrete mathematical model of the system. But the approximations considered in the development of mathematical model for the nonlinear system and also the uncertainty in the parameter values will deteriorate the performance of control algorithm. To enhance the...
This paper introduces operation and control of fixed capacitor thyristor binary switched reactor. The proposed system is used for Voltage Regulation and Reactive Power Compensation of the transmission system. It consists of reactor banks, arranged in binary order steps with fixed capacitor is referred as FC-TBSR. Normally we use SVC (TSC+TCR) for reactive power compensation and voltage regulation...
Power electronic controller based power system equipment are widely used in industrial, commercial and residential sectors. These controllers help in energy saving, but they introduce different power quality issues such as harmonic distortions in current and voltage, voltage sag/swell etc. These power quality issues cause malfunctioning of associated circuits. This paper presents an adaptive shunt...
Performance of a binary asymmetrical cascaded H-bridge (CHB) inverter using two H-bridges is investigated in this paper. A modified hybrid modulation technique is implemented where one bridge operates at fundamental switching frequency and handles most of the power. The 2nd bridge operates at a higher switching frequency to generate a desired sinusoidal waveform at the output. Thus, the H-bridges...
This paper presents a single stage SPV (Solar Photovoltaic) system using an adaptive novel control (ANC) Scheme. The SPV system includes SPV array, VSC (Voltage Source Converter), ripple filter, nonlinear loads and three-phase distribution network. As compared to two stage systems, a single stage SPV system is developed, resulting in depletion in cost, size, weight and an improved efficiency. The...
This paper presents the dynamic performance analysis of grid connected Z-source inverter (ZSI) based distributed generation (DG). ZSI provides a single stage buck boost conversion which reduces the switching losses and becomes an economical option for DG systems. The standards set by the utility is met by the ZSI even during variable input conditions by regulation of shoot through duty ratio. The...
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