Power system transient stability analysis including synchronous and induction generators

Souza, Camila Louise de; Neto, Luciano Martins; Guimarães, Geraldo Caixeta; Moraes, A.J.

doi:10.1109/ptc.2001.964711

Cited by 35 publications

(14 citation statements)

References 2 publications

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“…So to compensate the reactive power demand at steady state, a capacitor bank is inserted at the terminal of IG [12][13][14]. The value of the capacitor C is so chosen that the power factor of the wind power station becomes unity when it is operating in the rated condition (V=1.0, P=0.5).…”

Section: Model Systemmentioning

confidence: 99%

Stabilization of Wind Generator by Using STATCOM/SMES

Sheikh

Razzak

2009

J. Sci. Res.

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In this work, the STATCOM/SMES system with a voltage-source IGBT converter is modeled as a controllable energy source. The objective of the proposed STATCOM/SMES topology is to provide both active and reactive power, which can significantly decrease the voltage and power fluctuations of grid connected fixed speed wind generators. One major problem in wind generator output power smoothing is setting of the reference output power. Constant output power reference is not a good choice because there can be some cases where wind speed is very low and then sufficient power cannot be obtained. In that case, energy storage device can solve the problem but large energy capacity may be needed. To generate output power reference, a Simple Moving Average (SMA) technique is used which corresponds to the energy storage capacity. Thus the capacity of SMES can be small (50% of wind farm capacity). Real wind speed data is used in the simulation analyses, which validates the effectiveness of the proposed control strategy.

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Section: Model Systemmentioning

confidence: 99%

Stabilization of Wind Generator by Using STATCOM/SMES

Sheikh

Razzak

2009

J. Sci. Res.

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“…To establish the rotating magnetic field of the stator, reactive power is needed to be supplied from the network to the stator winding of the induction generator (IG). To compensate the reactive power demand at steady state, a capacitor bank is inserted at the terminal of IG (4) (16) (23) . As a result, during load flow calculation this reactive power, Q C , supplied by the capacitor bank should be considered.…”

Section: Overviewmentioning

confidence: 99%

“…9. In the previous works (3)- (23) , MDZ block is not present in the modeling of pitch controller. Moreover, power and speed control modes are not shown separately and terminal voltage of wind generator is not sensed as the controller input.…”

Section: Controller Designmentioning

confidence: 99%

Transient Stability Enhancement of Wind Generator by a New Logical Pitch Controller

et al. 2006

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In this paper, a new logical pitch controller equipped with fuzzy logic controller (FLC) has been proposed which can enhance the transient performance of wind turbine generator system (WTGS) when severe network disturbances occur in power system. Moreover, it can maintain the output power at rated level when wind speed is over the rated speed. Before transient stability analysis, it is necessary to determine initial values of WTGS connecting with the external network. In this paper, the initial value calculation method of WTGS is discussed also at different windy conditions. Finally, in order to evaluate the effectiveness of the proposed controller for transient stability, simulations have been carried out for severe network disturbances and windy conditions. From the simulation results it is seen that the proposed controller can enhance the transient stability of wind generator at any network, fault or windy condition as well as maintain output power of wind generator at rated level when wind speed is over the rated speed.The model system used for simulation of transient stability is shown in Fig. 1. The main purpose of using the pitch controller with wind turbine is to maintain a constant output power at the terminal of the induction generator (IG) when wind speed is over the rated speed. The proposed controller as shown in Fig. 2 can serve this purpose well. Moreover, it can also enhance the transient stability of induction generator. For the robustness of the pitch controller it is necessary to sense the terminal voltage of IG as the controller input. If the IG rotor speed increases to threshold value, i.e. 3% increase from its rated speed, the controller works in speed control mode, where W THR IG is the threshold value. Pitch controller operating status will be determined by a status gain whose input will be the output of logical comparator. The performance of the proposed pitch controller equipped with FLC is compared to that of equipped with PI controller. The power and speed response of IG after a 3LG fault in power system are shown in Fig. 3 and Fig. 4 respectively. It is clear Mohd. Hasan Ali * MemberRion Takahashi * MemberToshiaki Murata * MemberJunji Tamura * MemberIn order to investigate the impacts of the integration of wind farms into utilities networks, transient stability should be analyzed before connecting wind turbine generator system (WTGS) to the power system. In this paper, a new logical pitch controller equipped with fuzzy logic controller (FLC) has been proposed, which can enhance the transient performance of WTGS during severe network disturbances. Moreover, it can maintain the output power at rated level when wind speed is over the rated speed. Before transient stability analysis, it is necessary to determine initial values of WTGS connected to the external network. In this paper, the initial value calculation method of WTGS is discussed at different wind conditions. Finally, in order to evaluate the effectiveness of the proposed controller in improving the transient stability, simul...

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“…The fixed speed WTGS that uses induction machine as wind generator has the stability problem similar to synchronous generator [3][4][5][6]. This study focuses on both transient and dynamic stability improvement issues of fixed speed WTGS.…”

Section: Introductionmentioning

confidence: 99%

A Combined Approach of Using an SDBR and a STATCOM to Enhance the Stability of a Wind Farm

Muyeen¹

2015

IEEE Systems Journal

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This paper presents a method to enhance the stability of grid connected wind farm composed of fixed speed wind turbine generator system (WTGS) using a combination of small size series dynamic breaking resistor (SDBR) and static synchronous compensator (STATCOM). SDBR and STATCOM have the active and reactive power control abilities, respectively, and a combination of these units pave the way to stabilize well the fixed speed wind farm. In this study, centralized control scheme of using SDBR and STATCOM in together is focused, which can be easily integrated with wind farm. Different types of symmetrical and unsymmetrical faults are considered to evaluate the transient performance of the proposed control scheme, applicable to grid connected wind farm. The effect of multi-mass drive train of fixed speed WTGS in fault analysis along with its importance in determining the size of SDBR to augment the transient stability of wind farm is investigated. Extensive simulation analyses are performed to determine the approximate sizes of both SDBR and STATCOM units. Dynamic analysis is performed using real wind speed data. A salient feature of this work is that the effectiveness of the proposed system to minimize the blade-shaft torsional oscillation of fixed speed WTGS is also analyzed. Simulation results show that a combination of small size SDBR and STATCOM is an effective means to stabilize the wind farm composed of fixed speed WTGS.

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Power system transient stability analysis including synchronous and induction generators

Cited by 35 publications

References 2 publications

Stabilization of Wind Generator by Using STATCOM/SMES

Stabilization of Wind Generator by Using STATCOM/SMES

Transient Stability Enhancement of Wind Generator by a New Logical Pitch Controller

A Combined Approach of Using an SDBR and a STATCOM to Enhance the Stability of a Wind Farm

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