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Laxmi Niveditha ¹, Ch.V Krishna Reddy ¹, P. Venkata Prasad ¹

Affiliations
1 Department of EEE, Chaitanya Bharathi Institute of Technology(A), Hyderabad, IN

Abstract

This paper presents enhancement of the Available Transfer Capability (ATC) using series compensation. It is imperative as part of the nature of the restructured power system to supply reliable and economical power supply. Owing to the expanded nature of the power system and large scale power transactions, it is important to determine ATC in a fast and accurate manner. At the same it is required that the transmission lines be utilised in the most optimum manner and hence requires the enhancement of ATC. The DC-PTDF method is used in this paper to calculate ATC under both intact condition and line outage contingency condition. Further series compensation in done in the transmission lines to enhance the ATC in both the cases. The proposed method is presented using IEEE-6 bus system.

Keywords

Restructured power system, Available transfer capability, Total transfer Capability, DC load flow, Power transfer distribution factors, Line outage distribution factors

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N. Usha ¹, P. Venkata Prasad ², K. Ramesh Reddy ³

Affiliations
1 Research Scholar , JNTUH. GNITS,Hyderabad-500104, IN
2 Professor, CBIT. Gandipet, Hyderabad-500075., IN
3 Professor,GNITS. Shaikpet, Hyderabad-500104, IN

Abstract

Many of the Adjustable speed drives are inverter based motor drives. There are various PWM techniques to control the inverter. This paper presents modified control strategy for five level asymmetrical dual inverter fed induction motor drive. The control method for the inverter improves the performance of the drive. The characteristics of the drive at different modulation indices were observed and found that at higher modulation index the total harmonic distortion of line currents is less. The time response of speed is better at modulation index greater than 0.75.The simulation based analysis and design is carried out in MATLAB^TM software.

Keywords

Dual Inverter, Space Vector Pulse Width Modulation, Induction Motor Drive

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M. Thirupathaiah , P. Venkata Prasad , V. Ganesh

Abstract

Due to the increase in sensitive loads to power disturbances, power quality issues became one of the major concerns in many of the distribution systems and industries. The majority of events causing the power quality issues are because of voltage sag and voltage swell. In a distribution system, it is very important that the fault should be removed immediately so that the whole system is protected and the service is not interrupted. In this paper, the performance of Dynamic Voltage Restorer (DVR) and Distribution Static Compensator (DSTATCOM) is analysed by simulated with PWM control scheme using PSCAD. The simulations were carried out with various test cases associated with voltage sag and swell due to three phase short circuit fault, inductive and capacitive load switching conditions. The analysis of DVR and DSTATCOM was done based on the compensation of each device for various power quality problems. Results are presented for DVR and DSTATCOM showing the compensation of voltage sag/swell for various test conditions.

Keywords

Distribution System, DSTATCOM, DVR, Voltage sag, Voltage swell.

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