Pinky Yadav

Bio: Pinky Yadav is an academic researcher. The author has contributed to research in topics: AC power & Maximum power transfer theorem. The author has an hindex of 1, co-authored 1 publications receiving 7 citations.

A New Scheme for Damping Torsional Modes in a Series Compensated Power System

Abstract: In the present paper, a new scheme for damping torsional modes in a series compensated power system has been developed. The proposed scheme, utilizes the effectiveness of combined active power and frequency (C.A.P.F.) SVS auxiliary controller in co-ordination with an induction machine damping unit coupled to the T-G shaft. Studies are conducted on the first IEEE benchmark model. The damping scheme stabilizes all the torsional modes over a wide operating range of power transfer. SVS is installed at the middle of transmission line to optimize the power transfer capability. Also the optimal location of IMDU along the T-G shaft has been determined by using eigenvalue analysis. It is found that locating IMDU after the IP turbine yields the maximum damping effect.

Damping subsynchronous oscillations in power system using shunt and series connected FACTS controllers

Abstract: Series compensation in long transmission lines is an effective solution of enhancing power transfer capacity of Power System network In this paper, series passive compensation and shunt active compensation provided by static synchronous compensator (STATCOM) and other FACTS controllers connected at the electrical center of the transmission line are considered The presence of series capacitors has given rise to the phenomena Subsynchronous Resonance (SSR) But in few conditions such as in fault conditions, SSR phenomenon takes place which can damage the turbine generator shaft In this paper SSR phenomenon is studied with modified IEEE second benchmark model and various techniques has been developed for damping of SSR by adjusting the series compensation and using the FACTS controllers Results have been taken with the help of MATLAB simulation

SSR Alleviation using BVLC Supplementary Controlled SVS of Series Compensated Power System

Abstract: The sub synchronous resonance (SSR) is a substantial problem in power system having a steam turbine generator connected to a series compensated transmission system. Flexible AC transmission systems (FACTS) controllers are widely applied to mitigate SSR. In this paper, a bus voltage and line current (BVLC) supplementary subsynchronous damping controller (SSDC) is proposed to alleviate subsynchronous resonance (SSR) and damping power system oscillations in a power system. Both eigenvalue investigation and time-domain simulation results verify that the proposed method can damp torsional oscillations of the power system with SVS bus voltage and line current (BVLC) supplementary controller. The results demonstrate that the proposed controller has a successful performance in minimizing the SSR. It is shown that the controller is able to stabilize all unstable modes. The study is performed on the system adapted from the IEEE first benchmark model. All the simulations are carried out in MATLAB/SIMULINK environment.

Mitigation of SSR Oscillations in Series Compensated Line using LCAP Subsynchronous Damping Controller

Abstract: Subsynchronous Resonance (SSR) is a growing problem in power systems having series compensated transmission lines. Subsynchronous resonance with low frequency that surpasses aggregate fatigue threshold of the generator shaft frequently could significantly reduce the shaft service life, which is a new problem that emerges in recent years. Flexible AC transmission systems (FACTS) controllers are widely applied to alleviate subsynchronous resonance. A line current and active power (LCAP) supplementary subsynchronous damping controller (SSDC) is proposed to damp subsynchronous resonance caused by series capacitors. Both eigenvalue investigation and time-domain simulation results verify that the proposed control strategy can effectively damping power system oscillations of the power system with SVS and SSDC. Time domain simulations using the nonlinear system model are also carried out to demonstrate the effectiveness of the proposed damping controller. The recommended control approach has been accumulated with the IEEE first benchmark model for SSR study. The analysis indicates that SVS using the proposed control strategy has better alleviation effect and output characteristics. All the simulations are validated by using MATLAB/Simulink environment.

Mitigation technique and measurement of subsynchronous resonance

Abstract: Due to development in the field of power system, more and more series capacitance compensations have been used in transmission system extensively and because of series capacitance compensation it leads to SSR problems. SSR occurs when a natural frequency of a series compensated transmission system coincides with the complement of one of the torsional modes of the turbine-generator shaft system. Under such circumstances, the turbine-generator shaft system oscillates at a frequency corresponding to the torsional mode frequency and unless corrective action is taken, the torsional oscillations can grow and may result in shaft damage in a few seconds. For mitigating the SSR in transmission system, a mitigation measure based on SVC is introduced[1].

Alleviation SSR torsional transient torque of TG shaft sections incorporating SSDC

Abstract: In this paper three supplementary Sub-synchronous damping controllers (SSDC) are proposed for damping out sub-synchronous torsional oscillations in power system with capacitor compensated transmission line. Capacitor compensation has widely been used as a very valuable way of escalating the power transfer capability and improving stability of power systems. Capacitor compensation in long transmission lines may grounds sub-synchronous resonance (SSR). The eigenvalue investigation tool is used to ascertain the subsistence of SSR. An addition of supplementary controller is able to stabilize all unstable modes for T-network model. Eigenvalue investigation and time domain simulation are considered to investigate the performance of the controllers. The effectiveness of the proposed supplementary controller is compared on the IEEE first benchmark model for computer simulations of SSR by means of eigenvalue investigation in MATLAB/Simulink environment. Three supplementary sub-synchronous damping controllers are considered in order to compare effectiveness of SSDC during higher loading in alleviating the small signal stability problem.