Detecting and Simulating of Harmonic Currents in Power System

2010 ◽  
Author(s):  
Yilun Zhu
Keyword(s):  
Power System ◽  
Harmonic Currents

Smart Switching Power Supply with Input Voltage Waveform Correction

2014 ◽  
Vol 614 ◽  
pp. 245-248
Author(s):  
You Chen Yuan ◽  
Meng Wang ◽  
Yu Wei Chen
Keyword(s):  
Power System ◽  
Power Transmission ◽  
Voltage Drop ◽  
Power Grid ◽  
Input Voltage ◽  
Voltage Waveform ◽  
Harmonic Current ◽  
Switching Power ◽  
Harmonic Currents ◽  
Smart Control

The technology of smart control rectifier is introduced in this paper, in which the harmonic currents in power system is reduced and the voltage waveform is compensated. The voltage waveform in power system is measured by microcontroller, and is compared with the standard sinusoidal voltage waveform and the error voltage is obtained which contains the information of harmonic current waveform. The error voltage is employed to control the input current of the rectifier, and the reverse components of harmonic current is involved in the power side current of the appliance, by this means to get rid of some of the harmonic currents in power grid. Harmonic current will produce a voltage drop on the resistance in power transmission line to make the voltage waveform distortion happen; and the reduction of the harmonic current will shrink the distortion of voltage waveform. Taking a capacitive soft switching flyback push-pull converter as an example, the experimental circuit and the testing system are designed; the software programming and circuit debugging are accomplished. The experimental results show that the smart control rectifier can absorb harmonic currents from the power grid when operating in rectification, and to get the input voltage waveform corrected.

scholarly journals Mitigation of Harmonics in Power Transmission Network using Filters

2020 ◽  
Vol 9 (1) ◽  
pp. 1283-1288
Keyword(s):  
Power System ◽  
Harmonic Analysis ◽  
Power Quality ◽  
Power Transmission ◽  
Flow Analysis ◽  
Electric Utility ◽  
Load Flow ◽  
Optimal Placement ◽  
Harmonic Currents ◽  
Mitigation Techniques

In the novel times, with the surge in use of power electronics, power quality with system efficiency is playing a symbolic role for the advancement of electric supply. The fundamental purpose of the electric utility is to provide a sinusoidal voltage at constant magnitude throughout the system. This objective is convoluted because of the loads present in the system which produce harmonic currents. Due to these harmonic currents, distorted voltages and currents are carried out which affect the reliability and efficiency of the system in several ways. The sinusoidal waveform produced by electric utilities is distorted due to harmonics and increased use of non-linear loads. The deterioration of the power quality and reliability of the power system is due to the presence of these harmonics in the power system. Hence, we need a proper analytical approach to study, classify and characterize the harmonics present in the system and develop a suitable and effective mitigation method to reduce the harmonics in the power system to standard limits of harmonics prescribed by the IEEE and IEC standards. The study of the level of harmonics present in the system, their causes and effects are known as harmonic analysis or harmonics study. Based on the observations of harmonic analysis we develop mitigation techniques to reduce these harmonics. One such method is the implementation of filters. By implementing harmonic filters, we mitigate the harmonics present in the system by providing a low impedance path. The methodological procedure behind effective design and implementation of filters is achieved by performing load flow analysis to obtain the system data and harmonic analysis to obtain data of harmonics present in the system. Based on the data obtained, the type of filter and the optimal placement of filter is decided to mitigate the harmonics. The mitigation of harmonics can report significant benefits for industries, data centers, etc. in terms of overall installation cost and protection against interruptions and equipment faults in the power system. The overall process of Harmonic analysis and mitigation techniques are performed using Mi-Power software.

scholarly journals Shunt Active Power Filter: A Review on Phase Synchronization Control Techniques

Electronics ◽  
2019 ◽  
Vol 8 (7) ◽  
pp. 791
Author(s):  
Yap Hoon ◽  
Mohd Amran Mohd Radzi ◽  
Muhammad Ammirrul Atiqi Mohd Zainuri ◽  
Mohamad Adzhar Md Zawawi
Keyword(s):  
Power System ◽  
Phase Synchronization ◽  
Active Power Filter ◽  
Active Power ◽  
Shunt Active Power Filter ◽  
Power Filter ◽  
Harmonic Currents ◽  
Working Principle ◽  
And Performance ◽  
Suitable Technique

Owing to the destructive impacts of harmonic currents, the topic of reducing their impacts on power system has attracted tremendous research interests. In this regard, a shunt active power filter (SAPF) is recognized to be the most reliable instrument. It performs by first detecting the harmonic currents that are present in a harmonic-contaminated power system, and subsequently generates and injects corrective mitigation current back into the power system to cancel out all the detected harmonic currents. This means that other than the ability to generate corrective mitigation current itself, it is actually more important to make sure that the SAPF is able to operate in phase with the operating power system, so that the mitigation current can correctly be injected. Hence, proper synchronization technique needs to be integrated when designing the control algorithms of SAPF. This paper critically discusses and analyzes various types of existing phase synchronization techniques which have been applied to manage operation of SAPF; in terms of features, working principle, implementation and performance. The analysis provided can potentially serve as a guideline and provision of information on selecting the most suitable technique for synchronizing SAPF with the connected power system.

A New Method of Harmonic Detection Based on Auxiliary Tools

2012 ◽  
Vol 433-440 ◽  
pp. 6462-6466
Author(s):  
Song Wang ◽  
Ming Guang Liu ◽  
De He Li ◽  
Hong Rui Wang
Keyword(s):  
Experimental Data ◽  
Power Systems ◽  
Power System ◽  
Power Quality ◽  
Theoretical Foundation ◽  
Good Alternative ◽  
Harmonic Detection ◽  
Harmonic Currents ◽  
Universal Applicability ◽  
Harmonic Measurement

In power systems there are many non-linear loads, the resulting harmonics on the power quality can cause great impact to the power system. Thus it is important to monitor and analyze harmonics generated by these equipments in order to get a better power quality. In this paper, we firstly analysis the theoretical foundation of the harmonic measurement. Secondly, by use of the experimental data received from oscilloscope, we calculate and analyze the harmonic currents by using the tool of FFT in MATLAB. The method is of universal applicability, particularly compared with the expensive power analyzing equipments, which may be a good alternative.

scholarly journals Series Compensation by using Shunt Active Filter to Mitigate the Harmonic Currents

2021 ◽  
Vol 9 (VI) ◽  
pp. 3012-3013
Author(s):  
Janjirala Sai Kamal
Keyword(s):  
Power System ◽  
Electronic Devices ◽  
Active Power Filter ◽  
Active Power ◽  
Series Compensation ◽  
Shunt Active Power Filter ◽  
Shunt Active Filter ◽  
Power Filter ◽  
Harmonic Currents ◽  
High Level

The rise in power electronic devices in power system has increased the problems of harmonics and power quality. In this paper I have discussed about the harmonics that are developed in power system due to non-linear loads. The damage of harmonics may rise from normal level to high level depending on their duration and the order of harmonic .So to mitigate this harmonics in power system I have introduced shunt active power filter by series compensation method. In this paper it is discussed how harmonics are reduced using shunt active power filter and it is shown through MATLAB/Simulink .The results of the simulation have been shown where the harmonics developed in power supply has reduced.

scholarly journals Studying the Effect of Non-Linear Loads Harmonics on Electric Generator Power Rating Selection

2017 ◽  
Vol 13 (18) ◽  
pp. 548 ◽  
Author(s):  
Ahmed EL Sebaay ◽  
Mahmoud Ramadan ◽  
Maged A. Abu Adma
Keyword(s):  
Power System ◽  
Power Supply ◽  
Harmonic Distortion ◽  
Synchronous Generator ◽  
Electric Power System ◽  
Variable Frequency Drive ◽  
Current Harmonics ◽  
Electric Generator ◽  
Harmonic Currents ◽  
Non Linear

Non-linear loads connected to an electric power system produce Harmonic currents, harmonics are introduced into the system in the form of currents whose frequencies are the integral multiples of the fundamental power system frequency (50/60 Hz). The harmonic currents interact with the supply system impedance causing distortions in supply output voltage and current, which has a very bad effect on all other loads connected to the system and the power supply itself, such as overheating, increasing powers losses in the system, and malfunction of protection and control devices connected to the system. This paper presents a study to analyze the effect of voltage and current harmonics resulting from non-linear loads such as variable frequency drive, uninterruptable power supply, and battery chargers on operation and power rating of synchronous generator. The study introduces an optimized method for selecting the suitable generator power rating to withstand harmful harmonics effects for a safe operation of the generator, saving its lifetime, and to improve the power quality of the power system. The method depends on analyzing the effect of increasing the supply generator power rating on the THVD produced from non-linear loads harmonics connected to the system. By calculating the THVD for each case of a generator power rating, a mathematical relationship between generator power rating and TVHD can be found. So, the relationship between generator power rating and total harmonic distortion in the power system will be discussed clearly.

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