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An Unified Power Flow Controller (UPFC) is a typical Flexible AC Transmission System (FACTS) device playing a vital role as a stability aid for large transient disturbances in an interconnected power system. This paper deals with the design of Feedback Linearising Controller (FBLC) for UPFC. The 3-phase fault is created on the SMIB system and the results are simulated. The results proved the supremacy...
Damping of Torsional stresses due to sub synchronous resonance (SSR) using a new static var system (SVS) control strategy is investigated in this paper. In order to damp out torsional oscillations, a proportional integral (PI) controller in coordination with auxiliary control signal is employed to modulate the reactive power output of SVS in accordance to locally measurable signals such as combined...
This paper presents a neural network controller for multi-level inverter based Static Synchronous Series Compensator (SSSC) for a multi-machine power system. The neural network controller is designed using back propagation network algorithm. Back Propagation algorithm is employed to update weights for the design of the proposed controller. The proposed neural network controller is capable of providing...
This paper develops a harmonic compensation approach for the stator output voltage of a stand-alone doubly fed induction generator (DFIG) feeding a nonlinear (diode rectifier) load. This load type is characterized by a nonsinusoidal stator voltage consisting of severe harmonic components, fifth and seventh ones, which deteriorate the performance of other loads connected to the DFIG. The aim of the...
This paper presents a novel Phase Locked Loop (PLL) circuit in conjunction with Proportional Integral (PI) or Proportional Integral Derivative (PID) or Fuzzy Logic Controller (FLC) based shunt Active Power Line Conditioners (APLC) for the power-quality improvement such as current harmonics and reactive power compensation due to the non-linear/unbalanced loads. The shunt APLC system is implemented...
This paper shows an algorithm to control the DC bus voltage of a Shunt Active Power Filter (SAPF), based on the performance of the Proportional Integral (PI) controller. The power converter topology corresponds to a four-wire three-leg Voltage Source Inverter (VSI) with split capacitor. The algorithm is focused on the voltage control for each capacitor, such that the dc-voltages follow a reference...
An intelligent strategy for monitoring and control of a grid independent microgrid having an energy storage module, wind induction generator, and loads is presented in this paper. The goal for intelligent monitoring and control of the microgrid is to have real and reactive power control while regulating line voltage and frequency and thus maximizing the use of renewable resources. First, a conventional...
Apart from the traditional pulse-width modulation (PWM) or SPWM voltage source inverters (VSI), the proposed VSI with a Proportional integral current controller (PI VSI) offers superiority. They include instantaneous current control and wave shaping, fixed inverter switching frequency independent of the output frequency resulting in only known harmonics, and free-running carrier operation. A modeling...
This paper presents three current control strategies for a switched reluctance machine (SRM). Two classical controllers are recall : the hysteresis and the proportional - integral controller. Dynamic and current ripples with both controllers are compared and discussed. Then, a new current controller qualified as “hybrid controller” is proposed. It is a combination of the two previous structures. The...
In this paper the bidirectional power capability of a three-phase AC/DC/AC voltage-source converter is studied; based on the input-output linearization control theory, which is applied to the inner current loops that are connected in cascade with the outer loops. Both loops (inner and outer) allow a suitable control of the power flow. The controlled system is linearized and decoupled; based on the...
This paper presents a performance analysis of wind-powered self-excited induction generator (SEIG) and a vector-controlled PWM converter. Three-phase voltage-source converters are the building blocks of a large number of power electronic systems. The origin of difficulties in the control of the above converters is in their nonlinear nature. The PWM current control technique is used to derive the switching...
This paper presents a control method that reduces the pulsating torque and dc voltage problems of a Doubly Fed Induction Generator (DFIG)-based wind turbine system. To reduce the torque and the power ripple, a current control scheme, consisting of a proportional integral (PI) controller, is presented in a positive synchronously rotating reference frame and is capable of providing a precise current...
This paper presents analysis, design, and simulation for vector oriented control of three-phase voltage source pulse-width modulation (PWM) inverter which aims to optimize the utilization of wind power injected into the grid. To realize this goal, a digitally controlled converter-inverter system is proposed which provides economic utilization of the wind generator by insuring unity power factor operation...
This paper presents and compares the performance of two controllers namely Fuzzy Logic and Proportional Integral applied to a voltage source inverter/converter operating as an active power filter. The active power filter is operated to compensate harmonics and reactive power generated by the non-linear load and power factor correction simultaneously. This work is performed in order to make an accurate...
This paper proposes a novel control method for operation of a DFIG-based wind generator under unbalanced stand-alone loads, connected directly with stator terminal of the generator. The effect of unbalance condition at loads causes torque pulsations on generator and the stator voltage unbalance that degrade the dynamic behavior of control system. To eliminate the negative sequence components existing...
This paper presents a performance analysis of wind-powered self-excited induction generator (SEIG) and a vector-controlled pulse-width modulation (PWM) converter. Three-phase voltage-source converters are the building blocks of a great number of power electronic systems. The origin of difficulties in the control of the above converters is in their nonlinear nature. The PWM current control technique...
Studies the torque control of dual induction motors drive for tracked vehicle. Induction motor mathematics model is made up, a torque voltage PI (Proportional Integral) controller of induction motor is designed, torque control strategy based on rotor flux oriented is proposed, and dual induction motors independent drive system for tracked vehicle is constructed, whose of complex torque control strategy...
This paper focuses on a new robust control design of static var compensator (SVC) for voltage control in an isolated wind-diesel hybrid power system. The proposed method is based on the Hinfin loop shaping technique and genetic algorithm (GA). The structure of the controller is a proportional integral (PI) controller with single input. In the design, system uncertainties are modeled by a normalized...
This paper presents the analysis and operation of doubly fed induction generator (DFIG)-based wind power generation system under unbalanced network voltage conditions. The limited voltage and current ratings, the control capabilities of both the grid-side and the rotor-side converter (GSC & RSC) for unbalanced network voltage compensation are investigated in detail. A new current control scheme,...
In this paper, a single stage flyback pfc converter is used as a power supply of a testing distance relay system. The flyback pfc converter topology, operation and control are presented. A fast and robust sliding mode control of the input current is also presented. The sliding mode controller enables also high power factor and nearly sinusoidal input current. The dc output voltage of the converter...
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