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بررسی رزنانس زیرسنکرون در خطوط انتقال HVDC مبتنی بر VSC

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Investigation of Subsynchronous Resonance With VSC-Based HVDC Transmission Systems

Abstract—The HVDC converter control can destabilize torsional

modes of nearby turbogenerators. The first experience

of HVDC-turbine generator torsional interaction was observed

in 1977 during field tests at Square Butte. The development of

power semiconductors specially insulated-gate bipolar transistors

and gate turnoff thyristors (GTOs) has led to the small

power HVDC transmission based on voltage-source converters

(VSCs). The self-commutated VSC-based HVDC installations

have several advantages compared to conventional HVDC-based

online-commutated current source converter. The main objective

of this paper is to investigate and present the detailed analysis

of subsynchronous resonance (SSR) arising from a VSC-based

HVDC system connected close to generating units. The analysis

considers different operating modes of the converters. Based on

a case study it is shown that the dc voltage control mode of VSC

operation (rectifier/inverter) close to the generator units can contribute

positive damping in the torsional-mode frequency range of

interest. The investigations of SSR with VSC-based HVDC is carried

out based on linear (damping torque and eigenvalue) analysis

and nonlinear transient simulation. While the damping torque

eigenvalue analysis and controller design are based on the

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