دسته بندی | مقالات ترجمه شده isi |
بازدید ها | 11 |
فرمت فایل | doc |
حجم فایل | 346 کیلو بایت |
تعداد صفحات فایل | 13 |
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
دسته بندی | مقالات ترجمه شده isi |
بازدید ها | 6 |
فرمت فایل | doc |
حجم فایل | 1791 کیلو بایت |
تعداد صفحات فایل | 16 |
Damping of SSR Using Subsynchronous Current Suppressor With SSSC
Abstract—Hybrid series compensation using static synchronous
series compensator (SSSC) and passive series capacitor can improve
the stability of the system, increases the power transfer
capability and is useful for the fast control of power flow. This
paper analyzes the subsynchronous resonance (SSR) characteristics
of the hybrid series compensated power system in detail
and proposes a simple method for the extraction of subsynchronous
components of line current using filter. The extracted
subsynchronous frequency component of line current is used to
inject a proportional subsynchronous voltage in series with the
transmission line which suppresses subsynchronous current in
the transmission network. This novel technique is termed as subsynchronous
current suppressor. The design of subsynchronous
current suppressor is based on damping torque analysis and using
genetic algorithm. A novel graphical representation of series
resonance condition when SSSC is incorporated in the system
is presented. The detailed study of SSR is carried out based on
eigenvalue analysis, transient simulation and damping torque
analysis. The results of the case study on a system adapted from
IEEE First Benchmark Model demonstrates the effectiveness and
robust performance of subsynchronous current suppressor in
damping of SSR under various system operating conditions.
Linear analysis is performed on D-Q model of the system with
SSSC and the results are tested by executing transient simulation
based on detailed nonlinear three-phase model..