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Electromechanical oscillations are the major stability limits which constrain the power transfer in the interconnected system and influence the transmission line capacity. Power System Stabilizer (PSS) and Flexible AC Transmission Systems (FACTS) devices can be deploy to overcome these oscillations. In this paper the focus has been made on the damping of the inter-area oscillations and Unified Power...
The first non-parallel operating AC/DC system with series capacitor being constructed in China is hybrid of the Hulunbeier-Liaoning ±500 kV HVDC lines and Yimin-Fengtun 500 kV AC transmission system. Its subsynchronous oscillation problem become complex because of the mutual effect of series capacitor compensation and HVDC. In order to analyze the SSO characteristic of this new grid structure, six...
This paper investigates the impacts of distance and power flow of transmission line interconnections on the inter-area oscillations. The effectiveness of Power System Stabiliser (PSS) in damping the inter-area oscillations is studied considering various combinations of interconnection power flows and distances. Simulations are carried out on a two area 4 generator test system as well as on the simplified...
Sub-synchronous resonance (SSR) oscillations in long transmission line brings to failure of the turbine shaft. Static compensator (STATCOM) is a multifunctional FACTS device which its ability depend on its location on transmission line. In this paper, a controller is proposed and designed for STATCOM in transformer bus to damping SSR in all operation points. The controller is designed based on speed...
As the power system is interconnected with HVDC transmission, the power oscillation with low frequency appears in the AC transmission lines with weak damping. Due to the existence of the low frequency oscillation (LFO), the transmission power of AC lines is limited and the system angle stability is affected. In this paper, the low frequency oscillation (LFO) phenomena are introduced. By using the...
The frequency monitoring network (FNET) provides a low-cost, easily deployable method for wide-area monitoring. FNET has the capability to realize long term, high density and continuous monitoring of large interconnected power systems. In effect, there are potentials for ground-breaking research on wide-area monitoring and control. In this paper, low frequency oscillations in the Eastern Interconnection...
A novel supplementary subsynchronous damping controller (SSDC) is proposed for the generator excitation system which is capable of damping out subsynchronous oscillations in power systems with series compensated transmission lines. The offered SSDC uses a filtered feedback from generator acceleration power signal and after passing through a proportional gain it is added to automatic voltage regulator...
The interline power flow controller (IPFC) is a voltage-source-converter (VSC)-based flexible AC transmission system (FACTS) controller which can inject a voltage with controllable magnitude and phase angle at the line-frequency thereby providing compensation among multiple transmission lines. In this paper, the use of the IPFC based controller in damping of low frequency oscillations is investigated...
The study of various stability-control methods for a transmission system indicates that the reclosing time of a transmission line has a distinct influence on system stability. And there is an optimal reclosing time (ORT) for all transmission line faults. Utilizing the transient energy function (TEF) with classical models considered, the ORT setting computation method is proposed. This paper shows...
Real time test is a necessary step for the control device of equipment before it is installed in power system. In this paper, a closed-loop test platform which is based on real time digital simulator (RTDS) is established to test the performance of FACTS device controller. In this paper, static Var compensator (SVC) which is installed in a power plant is used for damping sub synchronous oscillation...
This paper presents a method for damping torsional oscillations in large turbo generator using thyristor controlled braking resistor (TCBR). The study is performed on system-1 of the second IEEE benchmark for simulation of sub-synchronous oscillations, using eigenvalue analysis and verified by detailed digital simulation. A dynamic fundamental frequency model for TCBR is developed. The pole placement...
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