Analysis of very long distance AC power transmission line

Lalitha³

2022

Day to day to electrical power demand increases very rapidly with linear and non-linear load demands. Especially the nonlinear loads are creating the harmonics in the current and voltage signals. The current and voltage signal values are measured with the phasor measurement unit (PMU) for the proper magnitude and phase angle calculation even in the presence of harmonic components in the signals. The performance of the PMU is depending upon the phasor calculation technique. Different technique/methods are available for the phasor calculation, from the method to method there is difference in the accuracy, phasor computation time and complexity. In this paper various techniques for phasor calculation are presented. For better performance of PMU, more accurate and less computation time for phasor calculation technique is required. But in real time, accuracy and speed both may not satisfied with single technique. Need to find a satisfactory technique, which satisfies the speed of phasor computation and accuracy. In this paper it is proposed that direct phasor estimation technique, which gives the better results in terms of accuracy and time and this method, satisfies the requirements for the dynamic monitoring of power system according to the IEEE std. C37.118.1-2011.

Section: Introductionmentioning

confidence: 99%

Performance and comparison of different phasor calculation techniques for the power system monitoring

Lalitha³

2022

“…This FBES system will give complete solution for the power system monitoring and protection in the dynamic state. For this dynamic state monitoring and protection purpose a test bed system is created with a controlled voltage source, transmission line, couple of loads, data collection and protection system [5]. With the controlled voltage source, voltage and frequency variations are created.…”

Section: Introductionmentioning

confidence: 99%

Dynamic state power system fault monitoring and protection with phasor measurements and fuzzy based expert system

Lalitha

2022

The main aim of this paper is building of a small micro grid test bed system with a few sources, and few loads with various types of lumped resistive (R), capacitive (C) and inductive (L) elements. Before the advent of electric smart grid every load is facilitated with its own electromagnetic. Slowly with an advancement of protection system numerical relays came into existence. Because in the numerical relays the communication between the relays and communication with central computer is possible, with this a coordinative protection system was evolved. For the monitoring and protection of system in dynamic state many of the numerical relays were now replaced by intelligent electronic devices. The system is to be centrally controlled with an improvement in data communications and the artificial intelligence into power system made it is possible to control the power system centrally. In this paper, it is presented that the fault is monitoring and protection against different types of faults, such as frequency variations, voltage variations and different fault conditions using fuzzy based expert system (FBES). The proposed protection scheme is adaptive for frequency variations, voltage variations and fault levels. The FBES scheme is implemented in the LabVIEW software with MAMDANI structure.

“…The advanced technology phasor measurements with time stamp will overcome the limitations of the SCADA and EMS system [4]. For this, intelligence electronic device is used, by using this voltage magnitude, phase angle, frequency, and change of frequency can be measured at faster rates with a common reference time [5], [6]. Common reference time can obtain from the global positioning system (GPS) signal available on all places of the world.…”

Section: Introductionmentioning

confidence: 99%

Effective monitoring of power system with phasor measurement unit and effective data storage system

Lalitha

2022

In the recent years the monitoring and operation of the power system became complex, due to the more demand from the different linear and non-linear loads and generation from the different sources. For the effective monitoring and operation of the power system, existing power system monitoring methods need to improve or new technologies are required. For the effective monitoring and operation of the power system phasor measurement unit (PMU) based monitoring is suitable, because it provide the dynamic state monitoring system. In this paper PMU based monitoring is proposed with effective data storage system and protection. With this method phasor values of voltage and current signals are calculated at the location of PMU and with the help of software based program effective data storage also possible. With this proposed model the phasor values in the power system at different locations monitoring also possible and required phasor data only stored and total data is only monitored. The phasor values of signals are calculated with direct phasor measurement technique in LabVIEW and by adding time stamping to the each phasor value accurate measurement of power flow is possible.