Improvement in the performance of on-load tap changer transformers operating in series

Smith, C.A.; Redfern, M.A.; Potts, S.

doi:10.1109/pes.2003.1267455

Cited by 14 publications

(5 citation statements)

References 4 publications

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“…The distinction between those two cases can be found by monitoring the local voltage and current at the DG point, as well as the upstream feeder impedance. This information could provide us a simulated voltage drop, from which we are able to determine whether any load change has occurred in the voltage control zone of the DG [15]. If the difference between simulated voltage drop before and after voltage excursion is large, then the second cause is more likely to occur.…”

Section: B Design Of Controller For Dg Systemmentioning

confidence: 99%

A Coordinated Voltage Control Approach for Coordination of OLTC, Voltage Regulator, and DG to Regulate Voltage in a Distribution Feeder

Muttaqi

Negnevitsky

et al. 2015

IEEE Trans. on Ind. Applicat.

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Integration of small-scale electricity generators, known as distributed generation (DG), into the distribution networks has become increasingly popular at the present. This tendency together with the falling price of the synchronous-type generator has potential to give DG a better chance at participating in the voltage regulation process together with other devices already available in the system. The voltage control issue turns out to be a very challenging problem for the distribution engineers since existing control coordination schemes would need to be reconsidered to take into account the DG operation. In this paper, we propose a control coordination technique, which is able to utilize the ability of DG as a voltage regulator and, at the same time, minimize interaction with other active devices, such as an on-load tap changing transformer and a voltage regulator. The technique has been developed based on the concept of control zone, line drop compensation, dead band, as well as the choice of controllers' parameters. Simulations carried out on an Australian system show that the technique is suitable and flexible for any system with multiple regulating devices including DG.Index Terms-Control zone, distributed generation (DG), distribution system, hysteresis band, line drop compensator, on-load tap changing transformer (OLTC), voltage control.

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Section: B Design Of Controller For Dg Systemmentioning

confidence: 99%

A Coordinated Voltage Control Approach for Coordination of OLTC, Voltage Regulator, and DG to Regulate Voltage in a Distribution Feeder

Muttaqi

Negnevitsky

et al. 2015

IEEE Trans. on Ind. Applicat.

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“…When the remote voltage is outside the deadband, this is due to one or both of the following reasons: -A voltage change upstream the DG -A load change downstream the DG The distinction between those two can be found by monitoring the local voltage and current at DG point, as well as the upstream feeder impedance. This information could provide us a simulated voltage drop, from which we are able to define if there is any load change has occurred in the voltage control zone of the DG [8]. If the difference between simulated voltage drop before and after voltage excursion is large, then the second cause is more likely to occur.…”

Section: Coordinated Voltage Controlmentioning

confidence: 99%

Response coordination of distributed generation and tap changers for voltage support

Muttaqi

Negnevitsky

et al. 2007

2007 Australasian Universities Power Engineering Conference

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“…One type of adverse interaction is device hunting which we define as one or more devices actuating in a repeated sequence that results in periodic voltage oscillations. Hunting among LTCs has been observed by utilities since the 1980s [4], [5] and has been modeled as a hybrid system in the literature [5]. Inverter-based DERs may be able to solve these problems if their control parameters are set appropriately.…”

Section: Introductionmentioning

confidence: 99%

Parameter Conditions to Prevent Voltage Oscillations Caused by LTC-Inverter Hunting on Power Distribution Grids

Swartz¹,

Celi²,

Pasqualetti³

et al. 2021

Preprint

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As more distributed energy resources (DERs) are connected to the power grid, it becomes increasingly important to ensure safe and effective coordination between legacy voltage regulation devices and inverter-based DERs. In this work, we show how a distribution circuit model, composed of two LTC's and two inverter devices, can create voltage oscillations even with reasonable choices of control parameters. By modeling the four-device circuit as a switched affine hybrid system, we analyze the system's oscillatory behavior, both during normal operation and after a cyber-physical attack. Through the analysis we determine the specific region of the voltage state space where oscillations are possible and derive conditions on the control parameters to guarantee against the oscillations. Finally, we project the derived parameter conditions onto 2D spaces, and describe the application of our problem formulation to grids with many devices.

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Improvement in the performance of on-load tap changer transformers operating in series

Cited by 14 publications

References 4 publications

A Coordinated Voltage Control Approach for Coordination of OLTC, Voltage Regulator, and DG to Regulate Voltage in a Distribution Feeder

A Coordinated Voltage Control Approach for Coordination of OLTC, Voltage Regulator, and DG to Regulate Voltage in a Distribution Feeder

Response coordination of distributed generation and tap changers for voltage support

Parameter Conditions to Prevent Voltage Oscillations Caused by LTC-Inverter Hunting on Power Distribution Grids

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