Abstract
Series compensation in transmission line with fixed series capacitor may cause Subsynchronous Resonance (SSR) at certain compensation level. This paper presents the application of static synchronous series compensator (SSSC) to mitigate impact of SSR. For analysis of SSR, IEEE first benchmark model is used and SSSC is located in transmission line at generator end. The linearized state space equation of SMIB system without and with SSSC has been developed to carry out eigenvalue analysis to identify potential modes for SSR. The AVR and PSS in the generator control loop coordinated with SSSC can successfully mitigate SSR. Time domain simulation is also carried out to confirm the results obtained with eigenvalue analysis.
Highlights
Series compensation of transmission line with fixed series capacitors has been used widely in long power transmission systems for enhancing power transfer capability and improving different stability limits [1]
This paper presents the application of static synchronous series compensator (SSSC) to mitigate impact of Subsynchronous Resonance (SSR)
The components of turbo-generator such as synchronous generator, different pressure stages of turbine are connected through different shaft sections which have been modeled as torsional springs with different stiffness coefficient depending upon shaft section diameter
Summary
Series compensation of transmission line with fixed series capacitors has been used widely in long power transmission systems for enhancing power transfer capability and improving different stability limits [1]. The components of turbo-generator such as synchronous generator, different pressure stages of turbine are connected through different shaft sections which have been modeled as torsional springs with different stiffness coefficient depending upon shaft section diameter Such spring-mass model of turbogenerator has several modes of oscillations, known as torsional modes, when resonant frequency of electrical network becomes complementary to one of the torsional frequencies of turbo-generator mechanical system. In [9], small signal performance of the power system has been shown to be improved by controlling the damping characteristic of power system by controlling the operation mode and response time of FACTS controller Taking this advantage of FACTS controller, their capability to influence SSR mitigation has been assessed in [10]. The linearized state space equations have been formulated to carry out eigenvalue analysis along with SSSC to demonstrate their dynamic characteristic to control torsional modes of oscillations
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