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The most important concern regarding a power system is the quality of its power. The main cause of most of the issues is nonlinear loads only. Shunt Active Power Filter (SAPF) has turned out to be a good solution to solve this problem because of its ability to fulfill the harmonic and reactive power components demand of the nonlinear loads. This paper presents comprehensive analysis of comparison...
The history of faults of induction motors is nearly the same age as the history of induction motors. In the past, induction motors were used in limited places and the faults were solved by taking various measures such as grounding, using over-current protectors, or using voltage-regulators. Nowadays the induction motors are used in a wide area of applications. Therefore the diagnosis and repair of...
This paper presents the design and implementation of a modular single phase multilevel inverter using the asymmetric cascade multilevel converter type. The converter output allows 7, 15 and 31 levels and use the step modulation strategy. The selective harmonic elimination (SHE) technique was used for the computation of the firing angles. All the results were simulated in MATLAB professional software...
The fundamental theory and control methods of Active Power Factor Correction (short for APFC) are introduced in this paper. It analyzes and studies the APFC based on the average current control single-phase Boost type APFC circuit. In addition, the simulation model is built on the MATLAB and the results are shown in this paper. The results show the average current control single-phase Boost type APFC...
This paper represents a novel reference compensation current estimation method for control of shunt active power filter (APF). The method allows the reference compensation currents are determined in the a-b-c reference frame and there is no reference frame transformation requirement, so the proposed system becomes very simple. The current control is done in time domain. The compensating current flows...
Three-phase high-power rectifier has widely applied to electromotor and high-power AC-DC transformation, but there are many problems such as many harmonic waves and low power factor about high-power rectifier. Along with much request of green electrical source, it is more and more important to reduce its disturbance to electrical network. High-frequency PWM rectifier can adjust output voltage and...
Base on the characteristics of the shunt active power filter, we uses the power electronic devices of the MATLAB/Simulink to model the system, uses self-compiled S-function to carry out the ip-iq current detection algorithm. In order to compensate the harmonic currents generated by the non-linear load and the reactive power of the process, the PWM signal is generated to drive the IGBT by the way of...
According to the characteristics of the power harmonic which includes steady and transient components and the wavelet analysis ability which processes unsteady signals and has the characteristic of multi-resolution analysis, the method of wavelet transform is applied to the detection of power harmonic. The method using wavelet transform to detect various harmonics in signals to be measured is presented...
Taking the three-phase uncontrolled diode-bridge rectifier of a certain style armored vehicle's power supple system as research object, a practical method to calculate the harmonic amplitudes of rectifier's DC-side output current is theoretically analyzed with the detailed calculation formulas are given. Based on MATLAB, the rectifier's circuit model is constructed. The comparison of simulation and...
The paper presents a nonlinear control strategy for single-phase active power filter applying exact feedback linearization theory, since this technique has been successfully applied to other area of power electronic. Using the state-space average modeling method, a nonlinear affine mode of single-phase shunt active power filter is set up. It is testified that the model is satisfied with the condition...
There are several conventional selected harmonic elimination techniques that form a class of pulse width modulation techniques (SHEPWM) that are very effective compared to other PWM schemes in the elimination of the low-order harmonics. However they suffer from a complicated computational process especially if the number of low order harmonics to be eliminated is high. This paper presents a new technique...
A controllable reactor of transformer type (CRT), which is a novel equipment to compensate the capacitive reactive power and keep the voltage stabilization of a transmission network, possesses such advantages as smooth power regulation, low current harmonic content, and fast response. By resolving the equations of a single-phase lossless transmission line, the relationship between the line voltages,...
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