Journal of Electrical Engineering and Electronic TechnologyISSN: 2325-9833

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Research Article, J Electr Eng Electron Technol Vol: 5 Issue: 1

Mitigation of Subsynchronous Oscillations with Common Controller Based Statcom and SSSC

Koteswara Raju D*, Umre BS, Junghare AS, Thakre MP and Kale VS
Department of Electrical Engineering, Visvesvaraya National Institute of Technology, Nagpur, India
Corresponding author : Koteswara Raju D
Department of Electrical Engineering, Visvesvaraya National Institute of Technology, South Ambazari Road, Nagpur, Maharashtra 440010, India
Tel: 0712 222 2828
E-mail: [email protected]
Received: August 24, 2015 Accepted: March 07, 2016 Published: March 12, 2016
Citation: Koteswara Raju D, Umre BS, Junghare AS, Thakre MP, Kale VS (2016) Mitigation of Subsynchronous Oscillations with Common Controller Based Statcom and SSSC. J Electr Eng Electron Technol 5:1. doi:10.4172/2325-9833.1000122

 

Abstract

This paper proposes a powerful common controller to mitigate the Turbine-generator shaft oscillations due to Subsynchronous resonance (SSR) with Statics synchronous compensator (STATCOM) and Static synchronous series compensator (SSSC). The mitigation of SSR is achieved by increasing the network damping at frequencies which are close to the torsional mode frequency of the turbine-generator shaft. The increase of network damping is done by the extraction of subsynchronous component of voltage and current from the measured signal of the system. From the knowledge of subsynchronous components, a shunt current is injected by STATCOM and a series voltage is injected by SSSC into the transmission line to make the subsynchronous current to zero which is the main cause of turbine oscillations. To analyze the effectiveness of the proposed common control scheme, IEEE first benchmark model has taken. The results show the accuracy of the proposed control scheme to mitigate the Torque amplification of SSR.

Keywords: Current control; STATCOM; SSSC; SSR; Torsional oscillation; Voltage source converter

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