Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : PWM


A Review of Control Technique Applied in Shunt Active Power Filter (SAPF)

Ayad M. Hadi; Ekhlas M. Thjeel; Ali K. Nahar

Engineering and Technology Journal, 2022, Volume 40, Issue 8, Pages 1035-1044
DOI: 10.30684/etj.v40i8.2116

In recent years, electronic transformers and electronic devices (nonlinear loads) have increased. These loads are the source of harmonics (non-sinusoidal and distorted waves) and the interactive force that affects the performance of the power system network. Also, it badly affects the power factor and electrical energy on the scales of efficiency and quality. For this reason, a system called “Active Power Filters” has been adopted. It provides an effective alternative to traditional LC passive power filters. It can improve network performance by treating and reducing harmonics, improving power factor and quality, avoiding resonance between the filter and the network, and reducing reactive power. This paper presents a study on the shunt active power filters device and how to connect it to the distribution network and A review of the bathing control strategies in the methods of calculating current and power, methods of controlling the PWM device, the most prominent techniques for improving the PID control system, and the most prominent algorithms applied in that to improve the safety performance of the  Shunt  Active Power Filter (SAPF) on the one hand and to demonstrate the ability of different systems to compensate for THD on the other hand. APF performance fluctuates from one control strategy to another. It reduced (THD) between 0.9% and 13% in several control techniques applied with PWM. The aim of this paper is to illustrate the techniques applied to control the performance of the "Shunt Active Power Filter" to reduce THD

Analysis and Simulation of Unmanned Aircraft Propeller Motor Using PSIM

Ahmed S. Yousif; Ammar S. Mohammed

Engineering and Technology Journal, 2018, Volume 36, Issue 10A, Pages 1081-1090
DOI: 10.30684/etj.36.10A.9

The study and simulation of a PI speed controller for small UAV or quadcopter motor is discussed in this research. The motor under consideration is MAXON 2260 215, which is a brushless DC motor that has permanent magnets on the rotating part and the stationary windings are connected so that the back electromotive force is trapezoidal. The motor utilizes a PI controller, which dominate the duty cycle of the PWM pulses applied on the switches of the inverter so that the motor can run at the required speed. A Chopper is used as a power converter and a proportional–integral as speed and current controller. The DC motor, which is being run individually, can be controlled on a wide range of operation up to the rated speed. The simulation is implemented and evaluated using PSIM software program under a wide range of speed, voltage and load torque inputs such as the rated speed and load torque, half the rated load torque and half speed since these tests are vital to test maneuver movement such as roll, pitch, yaw and throttle. The main objectives of this paper are; to understand the process of deriving the model for a propeller motor, to evaluate the stability and accuracy of the control loop for successful aviation, to apply a tuning plan on a closed loop system (PI) and to check the system procedure versus the given technical specifications.

Pulse Width Modulation for DC Motor Control Based on LM324

Jamal A. Mohammed

Engineering and Technology Journal, 2013, Volume 31, Issue 10, Pages 1882-1896

The DC motor is an important part of an equipment in many industrial applications requiring variable speed and load characteristics due to its ease of controllability.
Nowadays, there are lots of good-quality motor speed controllers on the market. However, their costs are relatively high. A speed controller with both low cost and good performance will be highly marketable, especially for small mobility applications.
The current work allows controlling the speed of a DC motor in both forward and reversing direction, from fully off to fully on. It runs in switch mode so it is quite efficient. In this work, designing motor bi-directional DC control circuit using Pulse Width Modulation (PWM) based on an operational amplifier model LM324 is implemented.
The proposed system offers many advantages such as simple structure, low cost, accurate, quite efficient, lightweight nature, small volume, and bi-directional speed control.

Analysis and Simulation of Shunt Active Power Filter For Harmonic Cancellation of Non Linear Loads

Ahmed M. Mohammed

Engineering and Technology Journal, 2010, Volume 28, Issue 16, Pages 5188-5199

Use of nonlinear loads, such as power converters, power sources,
uninterruptible power supply (UPS) units, and arc devices like electric furnaces and fluorescent lamps and large adjustable speed motor drives, is expected to grow rapidly. All of these loads inject harmonic currents and reactive power into the power system. This paper presents a study and simulation of a three phase active power filter. A multilevel PWM inverter is used with current control technique. The proposed control system is very simple and therefore practical
implementation of active power filters is available. The presented system is able to compensating current harmonics, reactive power and unbalance current of non linear loads. The total harmonic distortion is calculated for deferent load before and after filtering with deferent type of filter. A comparison is made between passive filter and active.
The results have been obtained using software called PSIM, which has
demonstrated its reliability for almost 10 years of simulations, which have been approved with real experimental results.

Optimum Solving SHEPWM Equations for Single Phase Inverter Using Resultant Method

Jamal A. Mohammed

Engineering and Technology Journal, 2008, Volume 26, Issue 6, Pages 660-670

This paper represents new method to determine the optimum switching angles for
Selective Harmonic Eliminated PWM (SHEPWM) inverter. Such switching angles are
defined by a set of nonlinear equations to be solved using the Resultant method. This is
done by first converting these equations that specify the harmonic elimination problem into
an equivalent set of polynomial equations. Then, using the mathematical theory of
Resultants, all solutions to this equivalent problem can be found without the need for any
initial guess. The complete solutions for unipolar SHEPWM switching pattern which
produce the fundamental while not generating specifically chosen harmonics are
investigated.