This paper presents new software developments related to sag classification and characterization. A new fuzzy rule based algorithm for classifying the types of voltage sags is proposed. The voltage sags are categorized into three types, i.e. sags due to the faults, large motor starting, or due to interaction between motor operation and faults. Three distinctive features of sag waveforms are def...

Event source locating is very important to improve the power quality level. And it is a helpful way to find the location of the power quality event source to determine the direction of event at each monitor. This paper presents a method to determine the relative location of the source of voltage sag. For this, the relative location of the source is defined first. Then, the main causes of voltag...

This paper presents the comparison of Push-Pull Inverter and Z-Source Inverter based Static Compensators (STATCOM).The closed loop system with STATCOM is modeled and simulated using the blocks of MATLAB/SIMULINK.Voltage sag mitigation using Push-Pull Inverter and ZSource Inverter are presented. The present work proposes Z-Source Inverter and Push-Pull Inverter based STATCOM for the control of r...

Power quality is one of major concerns in the present era. It has become important, with the introduction of sophisticated devices, whose performance is very sensitive to the quality of power supply that results in a failure of end user equipment’s. One of the major problems dealt here is the voltage sag. To solve this problem, custom power devices are used. One of those devices is the Dynamic ...

Voltage sags caused by the short-circuit faults in transmission and distribution lines have become one of the most important power quality problems facing industrial customers and utilities. Voltage sags are normally described by characteristics of both magnitude and duration, but phaseangle jump should be taken into account in identifying sag phenomena and finding their solutions. In this pape...

Abstract---In this paper we present a wavelet compression technique for power quality disturbance data. Power quality transient data are compressed and stored for analysis and classification purposes. Original data can be reconstructed and then analyzed using wavelet transform. Different power quality disturbances including voltage sag, swell, sag with harmonic and swell with harmonics are used...

Considering the influence of user equipment voltage tolerance characteristics and sag types on evaluation results, this paper proposes a severity method for system side which considers curve type. As such, quantitative events can be achieved. Firstly, user’s is used to construct comparison reference value energy index, in order realize rapid analysis event normal area abnormal area. Secondly, a...

This paper proposes a genetic algorithm optimization technique for optimal placement of distributed generation in a radial distribution system to minimize the total power loss and to improve the voltage sag performance. Load flow algorithm and three phase short circuit analysis are combined appropriately with GA, till access to acceptable results of this operation. The suggested method is progr...