Analysis of SSR With Three-Level Twelve-Pulse VSC-Based Interline Power-Flow Controller

• Published in: IEEE transactions on power delivery Vol. 22; no. 3; pp. 1688 - 1695
• Main Authors: Padiyar, K.R., Prabhu, N.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.07.2007; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Active control; Algorithms; Analytical models; Applied sciences; Compensation; Computer simulation; Control systems; Controllers; Converters; Convertors; Direct current; Disturbances. Regulation. Protection; Eigenvalue analysis; Eigenvalues; Eigenvalues and eigenfunctions; Electric potential; Electrical engineering. Electrical power engineering; Electrical machines; Electrical power engineering; Energy management; Exact sciences and technology; Flexible AC transmission systems; flexible ac transmission systems (FACTS); interline power-flow controller (IPFC); Operation. Load control. Reliability; Power conversion; Power networks and lines; Power system management; Regulation and control; static synchronous series compensator (SSSC); Studies; subsynchronous resonance (SSR); Transient analysis; transient simulation; Voltage; Voltage control; voltage-source converters (VSCs); interline power-flow controller (IPFC); subsynchronous resonance (SSR); Operating mode; Eigenvalue; Eigenvalue analysis; Voltage control; Power flow control; Load flow; Reactive power control; Power flow; flexible ac transmission systems (FACTS); IEEE standards; Mathematical model; Transient analysis; Multilevel system; Substation; Flexible AC transmission systems; Control system; Power electronics; voltage-source converters (VSCs); Voltage source converter; Case study; Subsynchronous resonance; Power consumption; Power control; static synchronous series compensator (SSSC); System simulation; Series compensation; transient simulation; Static synchronous series compensator
• ISSN: 0885-8977; 1937-4208
• DOI: 10.1109/TPWRD.2007.899544

The interline power-flow controller (IPFC) is a voltage-source-converter (VSC)-based flexible ac transmission system (FACTS) controller for series compensation with the unique capability of power-flow management among the multiline transmission systems of a substation. The reactive voltage injected by individual VSCs can be maintained constant or controlled to regulate active power flow in the respective line. While one VSC regulates the dc voltage, the others control the reactive power flows in the lines by injecting series active voltage. This paper presents the modelling of IPFC with 12-pulse, three-level converters and investigates the subsynchronous-resonance (SSR) characteristics of IPFC for different operating modes. The analysis of SSR is carried out based on eigenvalue analysis and transient simulation of the detailed system. It is illustrated with the help of a case study on a system adapted from the IEEE Second Benchmark Model. The analysis uses both D-Q model (neglecting harmonics in the output voltages of VSCs) and the three-phase model of VSCs using switching functions. While the eigenvalue analysis and controller design is based on the D-Q model, the transient simulation considers both models.