voltage controller Articles
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Starting performance optimisation of two-leg AC voltage controller-fed three-phase induction motor drive
This paper analyses the starting performance of two-leg AC voltage controller-fed three-phase induction motor drive and establishes that optimum value of firing angle combination for the voltage controller depends on the motor parameters. Identically rated machines with different motor parameters are used for the work. Optimum firing angle combination is obtained from the simulation, which gives ...
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A novel digital implementation of AC voltage controller for speed control of induction motor
In this paper, a novel, simple and reliable digital firing scheme has been implemented for speed control of three-phase induction motor using ac voltage controller. The system consists of three-phase supply connected to the three-phase induction motor via three triacs and its control circuit. The ac voltage controller has three modes of operation depending on the shape of supply current. The ...
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Torsional interaction studies on a power system compensated by PSO optimised static synchronous series compensator
In this paper, particle swarm optimisation (PSO) is used to optimise the PI controller parameters of the d.c. link voltage controller of a 48 pulse static synchronous series compensator (SSSC). The optimised controller improves the torsional performance of the SSSC compensated power system. High gain of power system stabilisers (PSS) can adversely affect the torsional performance of an SSSC ...
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Converse magnetoelectric effect in PZT/NiFe/CoFe nanocomposites
Magnetoelectric effect has attracted considerable interest due to the promising approach towards novel spintronics device. In this work, we study the converse magnetoelectric properties of PZT/NiFe/CoFe nanocomposites in which the piezoelectric substrate is transversely polarised and the thickness of the NiFe layer is varied. In these structures, the magnetic behaviour significantly changes under ...
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Power quality problem mitigation by unified power quality conditioner: an adaptive hysteresis control technique
An adaptive hysteresis current and voltage control technique for controlling Unified Power Quality Conditioner (UPQC) is proposed in this paper. The novelty of the proposed method is the series and shunt active power filters (APF) present in the UPQC has been controlled by the separate adaptive controllers for reducing the voltage and current perturbations. Here, the adaptive control technique ...
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A STATCOM based voltage regulator for parallel operated isolated asynchronous generators feeding three-phase four-wire loads
This paper presents an investigation on a voltage regulator for parallel operated isolated asynchronous generators (IAGs) supplying three-phase four-wire loads driven by constant speed prime mover like diesel engine, bio-mass, gasoline, etc. The proposed voltage regulator is realised using a static compensator (STATCOM) for providing the reactive power compensation, harmonic elimination and load ...
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Three-level 24-pulse STATCOM with optimised magnetics to regulate voltage in transmission system
In this paper, a 24-pulse three-level ±100 MVAR STATCOM (static synchronous compensator) is evolved employing 4 × 6-pulse NPC GTO-VSCs (neutral point diode clamped gate-turn-off thyristor based voltage source converters) with magnetics optimised to a single stage. Through an angle control, the magnitude and phase angle of the STATCOM voltage is controlled with a pre-calculated dead angle in d-q ...
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Voltage controlled stand-alone microhydro induction generator system
The paper discusses simulated control cases of the wound rotor self-excited induction generator WRSEIG. The generator external controller is designed to regulate the output voltage and frequency for constant or variable speed operation of the prime mover and has the inherent capability of protecting the load from short circuit, which permits voltage collapse under heavy loads. WRSEIG is ...
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A novel study for constant voltage and frequency operation of self–excited short–shunt induction generator
This paper presents an analytical technique for selecting the optimal shunt and series capacitances required for maintaining constant load voltage and frequency of a self excited short shunt induction generator (SESSIG). The study investigates the performance of the SESSIG at different operating conditions, such as speed of the prime mover, load impedance and load power factor. The required ...
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STATCOM based voltage-frequency regulation for SEIG driven by an uncontrolled speed turbine
This article presents the analysis and the control of a stand-alone self excited induction generator (SEIG) intended for rural applications. SEIG along with the STATCOM with battery energy storage (BES) in its DC side makes it possible to control the terminal voltage and frequency during rotor speed and load variation. Constant frequency control is carried out by the load angle 'δ', without rotor ...
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An improved power quality boost–flyback SSIPP fed BLDC motor drive
This paper presents a single–stage isolated power factor corrected power supply (SSIPP) fed permanent magnet brushless DC (BLDC) motor drive. An advantage of fast voltage regulation with single voltage control loop of SSIPP is utilised to develop a power factor correction (PFC) based BLDC motor drive. The speed of BLDC motor is controlled by varying the DC link voltage of the voltage source ...
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Optimal operating point tracking in a stand-alone PV system using particle swarm optimisation
In this paper, particle swarm optimisation (PSO) technique is employed to determine the optimal operating point of a photovoltaic module used in a stand-alone PV system. The PSO algorithm identifies the maximum power point by determining the array voltage at maximum point (VMPP). This value is utilised as a reference value to a voltage controller to adjust the duty cycle of a boost converter such ...
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Empirical Saving Measurements with PowerSines
To measure saving results in energy efficiency projects is not a trivial task. The modern voltage optimisation solution should not only control the voltage efficiently, but also provide a built-in mechanism for measuring saving results. With the rise in electricity prices, the readiness offinancial institutions to provide investments and the availability of government incentives for energy ...
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Improvement of power supply to rural customers through grid-interactive distributed generation
The integration of Distributed Generation (DG) into distribution grid systems introduces problems in network operation, control and protection. Key issues associated with DG inclusion are voltage or current control, cost-effective operation, protection coordination and network transients. Better understanding of these issues and finding solutions to these problems are important to power ...
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Voltage source converter with a transformer as an electronic load controller for a stand-alone power generation
This paper presents a new configuration of a voltage and frequency controller for a stand alone pico hydro power generating system employing an Isolated Asynchronous Generator (IAG). The proposed controller is an Electronic Load Controller (ELC), which consists of a three leg IGBT (Insulated Gate Bipolar Junction Transistor) based Voltage Source Converter (VSC), a DC chopper and an auxiliary load ...
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A combined multipulse-multilevel inverter based STATCOM for improving the voltage profile and transient stability of power system
In this paper, a new combined multipulse-multilevel inverter topology is proposed for static synchronous compensator to regulate AC supply voltage at a constant level. A detailed analysis of the operating characteristics of the various inverter topologies in respect of total harmonic distortion (THD) and device count are compared in the paper. A closed loop decoupled control strategy for ...
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VSC with zigzag transformer based electronic load controller for a stand-alone power generation
This paper presents a novel configuration of a voltage and frequency (VF) controller for a stand-alone pico hydro power generating system employing an asynchronous generator (IAG). The proposed VF controller is an electronic load controller (ELC), which consists of a three leg insulated gate bipolar junction transistor (IGBT) based voltage source converter (VSC), a DC chopper and an auxiliary ...
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Reactive power compensation of wind energy conversion system by using Unified Power Flow Controller
Voltage control and reactive power compensation in a distribution network with embedded Wind Energy Conversion System (WECS) represents the main concern of this paper. The WECS is a fixed speed/constant frequency system that is equipped with an induction generator driven by an unregulated wind turbine. The problem is viewed from short-term (10 seconds), mid-term (10 minutes) and long-term (48 ...
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H∞ controller for stability enhancement in VSC HVDC system with parallel AC lines
In this paper, a state-space model for a voltage source converter based high voltage direct current (VSC HVDC) transmission link in parallel with an AC transmission line is developed using dq-coordinate system. A robust H∞ control design for the converter and inverter of the VSC HVDC system is proposed to maintain the DC voltage and control the active and reactive power at the converter stations. ...
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Automatic calibration method for DC-DC power converter with sensorless adaptive voltage positioning controller
An automatic calibration method for a previously proposed sensorless adaptive voltage positioning (SLAVP) controller is presented in this article. The SLAVP scheme achieves AVP control without the need for current sensing and sampling required by conventional AVP schemes. However, the accuracy of the SLAVP control scheme is sensitive to the power path equivalent DC resistance value, R eq . ...
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