A Novel Control Strategy for Subsynchronous Resonance Mitigation Using 11 kV VFD-Based Auxiliary Power Plant Loads

Papiya Dattaray, Diptargha Chakravorty, Peter Wall, James Yu, Vladimir Terzija

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

This paper proposes a novel damping controller for subsynchronous resonance (SSR) mitigation using existing 11-kV variable frequency drive interfaced auxiliary power plant loads. The input of the proposed auxiliary damping controller is the turbine output power (P-{t}). This is a standard signal that is monitored in power plant control rooms and is available locally without the need for additional measurement and/or communication infrastructure. The auxiliary damping controller (ADC) adds an auxiliary speed signal to the existing speed reference in the closed-loop motor drive control in response to any torsional range oscillations seen in P-{t}, via a feedback compensator. The ADC extracts damping by exploiting SSR load interactions and is tuned using a residue-based pole placement technique. The ADC performance is evaluated for both torsional interaction and torque amplification types of SSR in the IEEE First Benchmark and IEEE 68-bus networks. The results show that the ADC is effective in providing positive damping to mitigate unstable SSR oscillations under a range of operating conditions. The proposed solution is a simple yet effective means of providing local control of SSR with minimal additional cost.

Original languageEnglish
Pages (from-to)728-740
Number of pages13
JournalIEEE Transactions on Power Delivery
Volume33
Issue number2
DOIs
Publication statusPublished - Apr 2018
Externally publishedYes

Keywords

  • Auxiliary power plant load
  • damping
  • induction motors
  • series compensation
  • subsynchronous resonance
  • torsional interactions
  • variable frequency drives

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