An innovative approach to smart automation testing at National Grid

Knauss, John-Paul H.; Warren, Cheri; Kearns, Dave

doi:10.1109/tdc.2012.6281507

Cited by 8 publications

(5 citation statements)

References 1 publication

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“…It is critical to protect the power between each feeder line and high-voltage users in the power system to solve the problem of unstable power generation of green energy sources, (11) so ensuring the operation of protective relay stations is the top priority. (12)(13)(14) Particularly in high-voltage power systems, overload or short-circuit issues originating from user equipment result in frequent power accidents. Therefore, a protective relay must be installed at the front and rear of each feeder line to isolate faults and minimize harm to the power system.…”

Section: Introductionmentioning

confidence: 99%

Smart Internet of Isolated Capacitor Trip Device for High-voltage Protective Relay of Backup Power

Huang¹,

Lien²,

Lin³

et al. 2020

Sensors and Materials

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In high-voltage power systems, overload or short-circuit accidents occur frequently owing to the failure of the user equipment, leading to the occurrence of power accidents. Therefore, protective relays must be installed before and after each feeder to isolate the occurrence of faults and thus reduce damage to the power system. However, when the working power supply of the protective relay loses power, it will not be possible to isolate the accident feeder, and the failure of the power system will expand, severely affecting the reliability of the system power supply. Therefore, it is expressly stated by the Taiwan Power Company that a capacitor trip device (CTD) must be installed to ensure a power supply to the protective relay for highvoltage users. However, CTDs currently on the market often fail to ensure the proper operation of the protective relay owing to an insufficient capacitance or a low output operating voltage. Therefore, we propose a high-capacity CTD capable of performing self-tests and instant notification for network monitoring. Compared with the conventional CTD, our CTD can prevent instantaneous large current transfer to the powered device, ensuring that the power supply of the powered device is uninterrupted. It can accomplish the real-time monitoring of the power status, provide a stable power supply, prevent overcurrent, and protect equipment. It is a very important contribution to the protection of the relay system.

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Section: Introductionmentioning

confidence: 99%

Smart Internet of Isolated Capacitor Trip Device for High-voltage Protective Relay of Backup Power

Huang¹,

Lien²,

Lin³

et al. 2020

Sensors and Materials

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“…A voltage sensor is an important part of the electric system and the accuracy and rapidity of sensor measurement decides the instantaneity of on-line monitoring of the smart power grid [ 1 ]. Potential sensors (PTs) and capacitive voltage sensors (CVTs) are often applied to the current electric system [ 2 , 3 , 4 , 5 , 6 ]. A PT involves a large volume, complex insulation structure, and high design cost.…”

Section: Introductionmentioning

confidence: 99%

Research and Experiments on a Unipolar Capacitive Voltage Sensor

Zhou

Li³

et al. 2015

Sensors

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Voltage sensors are an important part of the electric system. In service, traditional voltage sensors need to directly contact a high-voltage charged body. Sensors involve a large volume, complex insulation structures, and high design costs. Typically an iron core structure is adopted. As a result, ferromagnetic resonance can occur easily during practical application. Moreover, owing to the multilevel capacitor divider, the sensor cannot reflect the changes of measured voltage in time. Based on the electric field coupling principle, this paper designs a new voltage sensor; the unipolar structure design solves many problems of traditional voltage sensors like the great insulation design difficulty and high costs caused by grounding electrodes. A differential signal input structure is adopted for the detection circuit, which effectively restrains the influence of the common-mode interference signal. Through sensor modeling, simulation and calculations, the structural design of the sensor electrode was optimized, miniaturization of the sensor was realized, the voltage division ratio of the sensor was enhanced, and the phase difference of sensor measurement was weakened. The voltage sensor is applied to a single-phase voltage class line of 10 kV for testing. According to the test results, the designed sensor is able to meet the requirements of accurate and real-time measurement for voltage of the charged conductor as well as to provide a new method for electricity larceny prevention and on-line monitoring of the power grid in an electric system. Therefore, it can satisfy the development demands of the smart power grid.

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“…Electrical smart or micro grids extensively utilize modern control, communication and signal processing techniques to optimize the efficiencies of its constituents [3,4], while also utilizing advanced sensing and measurement instruments to supply green and clean power to consumers [5][6][7]. Steady increase in fossil fuels and other natural resources for superior power systems further led to green technologies, i.e., power generation systems utilizing renewable energy sources such as water, photovoltaic or wind.…”

Section: Introductionmentioning

confidence: 99%

“…Smart grids implement the green technologies along with conventional power generation plants to produce power in a more economical and ecological manner [3,8], especially under steadily increasing power demand, increasing scarcity in fossil fuels, and broader and justifiable concerns on environmental factors. However, the optimal integration of smart grid components and green technologies has proved to be sufficiently complex to warrant advanced modeling, control and optimization algorithms for stable, economical, ecological and reliable power system performance objectives under different types of uncertainties, varying communication channel characteristics and time-varying or nonlinear power source dynamics [3][4][5][6][8][9][10][11]. Also, various dynamical modeling and model-based as well as intelligent control implementations of microgrid safe and economical operations have been utilized to address the underlying complexities.…”

Section: Introductionmentioning

confidence: 99%

Linear Parameter Varying Modeling and Control of a Nonlinear Power Plant

Kamalapur

Yilmaz

Adediran

2015

2015 Seventh Annual IEEE Green Technologies Conference

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This study explores different Linear Parameter Varying (LPV) modeling approaches and optimization methodology for a nonlinear hydro power plant. The overall hydro plant dynamics is assumed to be decomposable to its subsystems whose overall characteristics involve different dynamical behaviors related to two real-time time-varying parameters that can be measurable in future periods. The hydro plant dynamics are expressed in terms of an LPV model with two time-varying parameters to efficiently characterize the plant dynamical variations to compare as well as achieve superior modeling, analysis and control frameworks, especially in contemporary smart grid networks. The two-parameter LPV hydro plant model control system configurations and corresponding simulations illustrate a valuable computational tool for nonlinear power plant optimization.

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An innovative approach to smart automation testing at National Grid

Cited by 8 publications

References 1 publication

Smart Internet of Isolated Capacitor Trip Device for High-voltage Protective Relay of Backup Power

Smart Internet of Isolated Capacitor Trip Device for High-voltage Protective Relay of Backup Power

Research and Experiments on a Unipolar Capacitive Voltage Sensor

Linear Parameter Varying Modeling and Control of a Nonlinear Power Plant

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