Power Quality Problems in PV Fed Grid Connected Inverter

2014 ◽  
Vol 622 ◽  
pp. 147-151
Author(s):  
Natesan Saritha ◽  
Venkatesan Jamuna ◽  
N. Nanthini
Keyword(s):  
Power Systems ◽  
Power Quality ◽  
System Performance ◽  
Short Circuit ◽  
Multilevel Inverter ◽  
Voltage Sag ◽  
Pv Inverter ◽  
Power Quality Disturbances ◽  
Grid Connected Inverter

—– In this paper, problem faced by grid connected pv inverter is presented. Inverters connected to grid are mostly affected due to short circuit problems in the power systems. Therefore it is essential to analyze power quality disturbances in order to improve the quality of the system. Performance of inverter is affected severely by voltage sag compared to other type of power quality disturbances. Also in this paper, multilevel inverter with sag condition and without sag condition is simulated using MATLAB/SIMULINK software

scholarly journals Power Quality Improvement Using Unified Power Quality compensator

2021 ◽  
Vol 10 (4) ◽  
pp. 2803-2809
Keyword(s):  
Power Systems ◽  
Power Quality ◽  
Distribution System ◽  
Supply Voltage ◽  
Voltage Sag ◽  
Harmonic Currents ◽  
Power Quality Improvement ◽  
Power Quality Disturbances ◽  
Quality Of Electric Power

Power quality has become an important factor in power systems, for consumer and household appliances with proliferation of various electric/ electronic equipment and computer systems. The main causes of a poor power quality are harmonic currents, poor power factor, supply voltage variations, etc. In recent years the demand for the quality of electric power has been increased rapidly. Power quality problems have received a great attention nowadays because of their impacts on both utilities and customers. Voltage sag, swell, momentary interruption, under voltages, over voltages, noise and harmonics are the most common power quality disturbances.It proposes a new connection for a unified power quality compensator (UPQC) to improve the power quality of two feeders in a distribution system. It illustrates how UPQC can improve the power quality by mitigating all these PQ disturbances. The proposed configuration of the UPQC is developed and verified for various power quality disturbances by simulating the mode using MATLAB.

scholarly journals Research on Transient Power Quality of Large-capacity Electric Arc Furnace

2021 ◽  
Author(s):  
Liu Yang ◽  
Qinyue Tan ◽  
Di Xiong ◽  
Zhengguang Liu
Keyword(s):  
Power Quality ◽  
Reactive Power ◽  
Short Circuit ◽  
Electric Arc Furnace ◽  
Electric Arc ◽  
Normal Operation ◽  
Arc Furnace ◽  
Three Phase ◽  
Transient Power Quality

The overrun of transient power quality index caused by the large-capacity electric arc furnace (EAF) has become a prominent problem affecting the safe and stable operation of the power system. (1) In this paper, the relationship between arc furnace volt-age and current is derived based on the different stages of arc combustion, and the random variation of chaotic phenomenon of the arc voltage are simulated. Established an EAF model suitable for the study of transient power quality problems. (2) Take 50t AC EAF as an example to analyze the reactive power impact and the influence on the point of common coupling (PCC) voltage caused by the three-phase short circuit of the electrode. The results show that the experimental results are consistent with the theoretical analysis, verifying the correctness and effectiveness of the model. (3) When the three-phase short-circuit occurs, the reactive power impact is nearly 6 times that of normal operation, the short-circuit current is 2.66 times that of normal operation, and the effective value of the PCC voltage has dropped by 40.37%, which provides a theoretical basis for real-time compensation of impulsive reactive power and improvement of the transient power quality of the EAF.

Voltage Sag due to Pollution Induced Flashover Across Ceramic Insulator Strings

2017 ◽  
Vol 18 (6) ◽  
Author(s):  
Subba Reddy B ◽  
Arup Kumar Goswami
Keyword(s):  
Power Systems ◽  
Power Quality ◽  
Voltage Sag ◽  
Reliable Operation ◽  
Ceramic Insulator ◽  
Voltage Dips ◽  
Utility Companies

AbstractVoltage sag or voltage dips are significant to industrial reliability. There is a necessity to characterize the feeder level power quality (PQ) and the PQ performance among various utility companies. Contamination/pollution induced flashover is the ultimate consequence of the creeping discharges across the insulator strings which induce voltage sag. These have a severe threat on the safe and reliable operation of power systems. In the present work an attempt has been made to experimentally investigate the occurrence of voltage sag/dips during pollution induced flashovers. Results show significant dip/sag in the voltage magnitude during the flashover process.

scholarly journals Stability Operation of Grid Connected Inverter

2019 ◽  
Vol 114 ◽  
pp. 04003
Author(s):  
Armeev Denis ◽  
Chuvashev Roman
Keyword(s):  
Power Systems ◽  
Renewable Energy Sources ◽  
Static Stability ◽  
Energy Sources ◽  
Electrical Grid ◽  
Operating Modes ◽  
Technical Requirements ◽  
Grid Connected Inverter ◽  
Sustainable Power

In the modern electric grid, there is an active penetration of distributed renewable energy sources and energy storage systems, which often require connection by means of electronic converter. Energy sources connected in the grid by means of electronic converter or inverter has large different parameters and operating modes compared to the generation of a traditional one. That leads to a different behavior of such sources in the network. With a large penetration of this kind of generation in the electrical grid, there is a need to revise the principles and methods of design and operation of both inverters and power systems. Otherwise there may be conditions in which it becomes impossible to ensure sustainable power supply and quality of power that satisfy the technical requirements. The goal of the paper is to study the operations of electricity sources connected in the power grid by means of inverter, analyzing the static stability of objects of this kind, as well as studying the possibility of creating algorithms that can successfully adapt such generation objects into a single power system.

scholarly journals The Operation and Model of UPQC in Voltage Sag Mitigation Using EMTP by Direct Method

2018 ◽  
Vol 2 (3) ◽  
Author(s):  
S. Mehdi Hosseini
Keyword(s):  
Power Quality ◽  
Direct Method ◽  
Voltage Sag ◽  
Transmitted Power ◽  
Terminal Voltage

Nowdays, regarding to the great us of sensitive devices, the quality of the transmitted power, have become an important issue. One of the most important dimension of power quality is magnitude load terminal voltage. Different devices has been designed for voltage sag compensation or other distortions. UPQC is a compensator which is able to compensate all distortions, such as voltage sag, flicker, unbalance, harmonic and current distortions such as reactive, harmonic and unbalance. Several controllers have been designed to compensate the whole or a part of distortions. In this paper its going to introduce a kind of controller which is able to compensate voltage sag to direct and simple by UPQC. At the end, simulation and voltage sag mitigation is going to be performed by ATP-EMTP software.

scholarly journals A Hybrid Approach to Classify Power Quality Problems in Distribution Systems

2021 ◽  
Author(s):  
Okan Ozgonenel ◽  
◽  
Kubra Nur Akpinar ◽  
Keyword(s):  
Power Systems ◽  
Power Quality ◽  
Electromagnetic Interference ◽  
Distribution Systems ◽  
Electrical Power ◽  
Hybrid Approach ◽  
Principal Component ◽  
Discrete Wavelet ◽  
Time Data ◽  
Power Quality Disturbances

Electrical power systems are expected to transmit continuously nominal rated sinusoidal voltage and current to consumers. However, the widespread use of power electronics has brought power quality problems. This study performs classification of power quality disturbances using an artificial neural network (ANN). The most appropriate ANN structure was determined using the Box-Behnken experimental design method. Nine types of disturbance (no fault, voltage sag, voltage, swell, flicker, harmonics, transient, DC component, electromagnetic interference, instant interruption) were investigated in computer simulations. The feature vectors used in the identification of the different types of disturbances were produced using the discrete wavelet transform and principal component analysis. Our results show that the optimized feed forward multilayer ANN structure successfully distinguishes power quality disturbances in simulation data and was also able to identify these disturbances in real time data from substations.

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