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Acoustic resonance has been an important problem in high pressure discharge lamp supplies at high frequency due to its undesirable effects such as arc distortion, fluctuation, lamp life reduction, discharge extinction and lamp destruction in the most severe cases. Our method for the injection of adjacent signals allows the restriction of certain selected power harmonics in the lamp in order to avoid...
The control of the current distribution in a two leg interleaved inverter is analyzed in this paper. Feedback is used in order to control the current distribution on the inverter legs, avoiding the use of bulky and costly passive solutions. Low THD in the output voltage is ensured by a PI compensator and a repetitive controller. The design of the current compensators was accomplished by approximating...
Windowed ADC is an attractive solution for the high efficiency digitally-controlled converters. However its limited conversion range restricts the transient speed for the dynamic voltage scaling applications. For slew rate improvement, this work designed a multi-mode PI/PID controller incorporated with the windowed ADC operation. In addition, to make output stable with no limit cycling, a current-controlled...
Proportional integral derivative (PID) controllers are usually used to control DC-DC boost converters in PV systems. However, they have to be tuned based on certain defined operating range using averaged mathematical models. Loading conditions have great effect on PI controllers; PI controllers are subjected to failure under dramatic load changes. This limits the PI controller's operating range. Moreover,...
The design of the voltage loop and current loop of three-phase high power factor PWM rectifier was introduced, the strategy of dual-mode control that combine fuzzy control to PI regulator is proposed, which use fuzzy controller to obtain quick dynamic response when deviation is in small range and adopt PI regulator to realize no static error when deviation is in long range, improving the control accuracy...
This paper presents a novel Adaptive Neural Fuzzy Inference System (ANFIS) based Matrix Converter for speed control of Induction Motor. The proposed ANFIS consists of fuzzy logic controller algorithm with a five layer Artificial Neural Network. The ANFIS system tunes the fuzzy system with hybrid learning algorithm and hence generates the reference voltage. The reference voltage is used to generate...
In this paper, the development of three-phase renewable energy inverter by using the dSPACE DS1104 digital signal processing controller board is presented. The board enables the MATLAB/Simulink model linking to the hardware. The standalone voltage source inverter's control system which is implemented in the DS1104 board utilizes a digital proportional integral controller to stabilize its 50Hz sinusoidal...
This paper aim to design a intelligent technique for BDC converter. The converter contains non-linear elements making the mathematical model more complex which instigate the use of FLC. The nature of FLC has adaptive characteristics that can achieve robust response to a system with uncertainty, parameter variation, and load disturbance. In order to see the advantages of FLC, classical PI control has...
This paper deals with the fuzzy logic based proportional-integral (FPI) regulators for voltage and frequency control (VFC) of an isolated asynchronous generator (IAG) in a wind energy conversion system (WECS). A three-leg voltage source converter (VSC) with battery supported energy storage (BSES) is used as a VFC. The VFC algorithm uses two fuzzy PI regulators, to improve the dynamic performance of...
Increasing non-linear loads cause various undesirable effects and power quality problems on utility supply, like low system efficiency, poor power factor, derating of power supply equipments, disturbance to other consumers and interference in nearby communications networks etc. This work proposes a parallel power processing scheme to improve the power quality of uncontrolled diode bridge rectifier...
In this paper, a thermal dilatory system is suggested, which can simulate the thermal process of a sample system with electrical circuits and LABVIEW software. In a real system, we can expect to have a combination of a linear equation and one delay. It's needed to be mentioned that we can use a combination of delay and linear equation to model a higher degree system. In this paper, this model will...
Matrix converter has received a considerable interest as a viable alternative to conventional back-to-back PWM converter. Industrial application of the Matrix converter is limited because of high susceptibility to input power disturbances. In this paper, under distorted input voltage and varying load conditions, behavior of the Matrix converter fed induction motor drive controlled by Indirect Space...
Voltage sag is one of the major power quality problem which results in a failure or a mis-operation of end use equipments. Sensitive industrial loads and Utility distribution networks all suffer from various types of outages and service interruptions which can cost significant financial loss per incident. The aim therefore, is to recommend measures that can improve voltage sag. In this paper a method...
This paper describes conventional and advanced methods for the control of D-STATCOM. The mathematical model of conventional double loop control, Direct-Output-Voltage (DOV) control, Decoupled DOV, Fuzzy-PI and Decoupled Fuzzy-PI based control is studied. The control scheme for the above approaches is implemented using Matlab Simulink platform. The dynamic response of the models are presented and compared.
This paper proposes a simple technique to get maximum power of wind energy conversion system (WECS) without using sensors for wind and rotor speed of the permanent magnet synchronous generator (PMSG). It uses the measurements of DC current and DC voltage to obtain maximum power point tracking (MPPT) by controlling the duty cycle of the DC-DC boost converter switch. Moreover, a PI control is employed...
Stability issues are a major concern in railway grids. Although these problems are most experienced in 16.7-Hz applications, low-frequency oscillations also occur in 50-Hz railway grids. In this paper, an advanced multivariable control concept is presented. Beside achieving very good dynamic behavior, the approach improves the introduced stability problem. The proper operation of the control is verified...
In recent years, HVDC Transmission has been developed very fast in China. Its main characteristic is bulk power transmission over long distance. Considering the importance and particularity of HVDC transmission, the main aim of different research aspects in HVDC is to keep the steady and reliable operation of HVDC project. As the key part, the control system affects the operation characteristics of...
Multibrid wind power generation system (MWPGS) has aroused more and more attention for its high energy conversion efficiency, high reliability, and flexible grid-connected power control. In order to achieve the decoupling regulation of the active and reactive power during the normal operation and enhance its capability of low voltage ride-though (LVRT) during grid voltage sag, a unified control strategy...
Doubly-fed induction generators (DFIG) are widely used in the wind farms. Many papers focus on their behavior connecting to an infinite bus and the influence on the power system stability ignoring the grid side converters. In this paper, the dynamic simulation of doubly-fed induction generators on multi-machine power system is studied. With the decoupled active and reactive power control scheme, compensated...
Stability aspects are a major concern in railway-traction applications. It is well-known that low-frequency oscillations occur in 16.7-Hz railway-grids. They can be initiated either by impedance variation or by multiple traction vehicles active in one feeding section. This paper focuses on the emulation of many traction vehicles starting up in the same feeding section and hereby causing instability...
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