Thyristor-Based FACTS Controllers for Electrical Transmission Systems

Mathur, R.M.; Varma, Rajiv K.

doi:10.1109/9780470546680

Cited by 789 publications

(363 citation statements)

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“…It conducted the disturbance analysis of different rotational component at zhe modulation frequency and analysed the reason of sub-synchronous oscillation in the wind power system with HVDC transmission lines. The paper [10] also summarized the sub-synchronous oscillation reason of different types of wind turbines, analyzed the double-fed induction motor, and found that SSTI occurred usually in a lower degree of series compensation system through simulation. The SSTI problem is very complicated and we need consider the electromechanical transient process and electromagnetic transient process of the network and the system controller at the sub-synchronous frequency [11].…”

Section: Sub-synchronous Torsional Interactions (Ssti)mentioning

confidence: 99%

“…Actually, SSCI is not only limited to the wind turbine and other FACTS Controller (SVC, STA-TCOM, etc.) with series compensation system interactions are likely to induce SSCI [10]. SSCI phenomenon leads to negative damping of the system with the fast direct current control of the wind turbine.…”

Section: Sub-synchronous Oscillation Problem Caused By Wind Turbines mentioning

confidence: 99%

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Overview of Sub-synchronous Oscillation in Wind Power System

Han¹,

Guo²,

Xu³

et al. 2013

EPE

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Nowadays with the improvement in the degree of emphasis on new energy, the wind power system has developed more and more rapidly over the world. Usually the wind plants are located in the remote areas which are far from the load centers. Generally series compensated AC transmission and high voltage DC transmission are made use of to improve the transmission capacity as two main effective ways which can solve the problem of large scale wind power transmission. The paper describes the three kinds of impact varieties and impact mechanisms in the sub-synchronous oscillation phenomena of wind power system based on doubly fed induction generator (DFIG) wind generators. At last, we point out the important problem that should be stressed in the wind power system.

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Section: Sub-synchronous Torsional Interactions (Ssti)mentioning

confidence: 99%

Section: Sub-synchronous Oscillation Problem Caused By Wind Turbines mentioning

confidence: 99%

Overview of Sub-synchronous Oscillation in Wind Power System

Han¹,

Guo²,

Xu³

et al. 2013

EPE

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“…The modeling aspects of the electromechanical system are given in detail in reference [11]. This system is shown in Fig.1.…”

Section: Dynamic Modelling Of Statcommentioning

confidence: 99%

A Hybrid Fuzzy/LQR Based Oscillation Damping Controller Using 3-level STATCOM

Ajami¹,

Taheri²

2011

IJCEE

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I. INTRODUCTIONFixed series capacitors have long been used in power systems as a cost-effective option for enhancing power transfer capability of HV transmission systems. However, the series capacitor has caused shaft damage in multistage steam turbine system in couple of occasions through subsynchronous resonance (SSR). SSR is an electric power system condition where the electric network exchanges energy with a turbine generator at one or more of the natural frequencies of the combined system under the subsynchronous frequency of the system [1]. This leads to turbine-generator shaft failure and system instability.Rotor oscillations of generator at a torsion mode frequency, (fm) induce armature voltage components at frequencies (fern) given by:(1) When the subsynchronous component fern is close to electrical resonant frequency, the subsynchronous torques produced by subsynchronous voltage components can be Manuscript received June 8, 2010. Ali Ajami is with the electrical engineering department of Azarbaijan university of Tarbiat Moallem, Tabriz, Iran, phone: +98-914-3183362; fax: +98-412-4327548; e-mail: ajami@azaruniv.edu Naser Taheri is with the electrical engineering department of, Islamic Azad University, Quchan Branch, Iran, e-mail: N.Taheri.1362@gmail.com sustained. This interplay between electrical and mechanical systems is termed as torsional oscillations [2].Flexible AC Transmission Systems (FACTS) technology is an important tool for permitting existing transmission facilities to be loaded, at least under contingency situations, up to their thermal limits without degrading system security [3][4][5][6]. The most striking feature is the ability to directly control transmission line flows by structurally changing parameters of the grid and to implement high-gain type controllers, based on fast switching.The uses of FACTS devices like STATCOM are increasing in the network for enhancing power transfer, voltage stability and damping of power oscillations. As a promising technology, the control of STATCOM has been discussed in many literatures [7][8][9][10]. In this paper, the damping of torsional oscillations using STATCOM, connected at the middle bus is studied. A supplementary fuzzy control signal is added to control circuit to damping oscillations caused by series compensator capacitance. To improve STATCOM controller, hybrid Fuzzy/LQR controller is proposed. II. DYNAMIC MODELLING OF STATCOMThe system considered is an IEEE benchmark used to study subsynchronous resonance. The modeling aspects of the electromechanical system are given in detail in reference [11]. This system is shown in Fig.1. One convenient method for studying balanced three-phase system (especially in synchronous machine problems) is to convert the three phase voltages and currents into synchronous rotating frame by abc/dq transformation. Computer and Electrical Engineering, Vol. 3, No. 2, April, 2011 1793-8163 185 are decoupled so that the use of classic control method is possible, and even more physical meaning for each control...

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“…Only a fixed set of capacitor provides the required VAR control, with a rapid control of bus voltage and improvement of utility power factor. It offers several advantages over conventional thyristorised converters [9] in terms of speed of response. The STATCOM is a voltage source inverter (VSI) based device, which regulates distribution bus voltage using reactive power compensation.…”

Section: Introductionmentioning

confidence: 99%