A New Method of Generating TWACS®Type Outbound Signals for Communication on Power Distribution Networks

Mak, Sioe T

doi:10.1109/tpas.1984.318523

Cited by 40 publications

(7 citation statements)

References 1 publication

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“…A drawback of the original TWACS frequency modulation technique [3] is that the transmitting device introduces reactive power losses. The advent of synchronous areas dominated by inverter connected generation introduces the possibility of modulating system frequency at the power source at minimal marginal cost.…”

Section: A Two Way Automatic Communication System (Twacs)mentioning

confidence: 99%

“…Using the AC system frequency (50 Hz or 60 Hz) as a carrier for frequency modulation, called power frequency communication (PFC), was first introduced with the TWACS communication system [2]. The TWACS transmitters described in [2], [3] are intended for modifying the frequency of a single radial feeder in a large synchronous area. This paper investigates a general framework for using AC system frequency for transmitting information which differs from TWACS in the following ways: the information reaches an entire synchronous area; it can utilize more of the available bandwidth; it can operate with or without time-dependent decoding; and it utilizes energy sources as transmitters.…”

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confidence: 99%

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System Frequency as Information Carrier in AC Power Systems

Douglass

Heussen

You

et al. 2015

IEEE Trans. Power Delivery

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Section: A Two Way Automatic Communication System (Twacs)mentioning

confidence: 99%

mentioning

confidence: 99%

System Frequency as Information Carrier in AC Power Systems

Douglass

Heussen

You

et al. 2015

IEEE Trans. Power Delivery

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“…The same technique has also been applied for automatic meter reading (AMR) [5] and load control applications. The potential interference between the anti-islanding and the AMR schemes becomes a natural concern.…”

Section: Interference Of Anti-islanding and Amr Schemesmentioning

confidence: 99%

A Power Line Signaling Based Scheme for Anti-Islanding Protection of Distributed Generators—Part II: Field Test Results

Wang

Kliber

Zhang

et al. 2007

IEEE Trans. Power Delivery

101

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Anti-islanding protection of distributed generators (DG) is a significant technical barrier to the emerging DG industry. In response to this challenge, a power line signaling based anti-islanding protection scheme has been proposed in a companion paper. The scheme broadcasts a signal from a substation to the DG sites using the distribution feeders as signal paths. A DG is considered as islanded from the upstream system if the signal is not detected at the DG site. This paper presents extensive field test results and experiences obtained for the proposed scheme. The results confirm that the proposed scheme is a very promising and economical method to satisfy anti-islanding protection requirements for synchronous DG interconnections.

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“…Remote detection techniques are based on communication between the utility and the DGs. These schemes include transfer trip [6] and power line signaling [7]. Although, these techniques may have better reliability than active and passive techniques, they are expensive to implement and hence uneconomical.…”

Section: Introductionmentioning

confidence: 99%

A Reliable Strategy in Order to Islanding Detection Based on Combined Active and Passive Techniques

Ebtehaj¹,

Sobhani²,

Sobhani³

2016

IJOEE

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One of the serious concern of grid connected distributed resources is islanding problem. This condition should be prevented due to several reasons concerning such as personnel and equipment safety. This paper investigated a mixed passive and active islanding detection method using energy of rate of change of active power (EROCOAP) and disturbance applying through q-axis of dq-current controller. Reduction of Non detection Zone to as close as possible and keeping the output power quality unchanged in normal condition are main emphasis of the proposed scheme. In addition, this technique can also overcome the problem of setting the detection thresholds inherent in the existing techniques. In this study, we propose to use a hybrid active and passive method for islanding detection. At first, the energy of ROCOAP is calculated for settling time of case study system. If this value becomes higher than threshold value, disturbance is applied to q-axis of current controller. By frequency measurement islanding condition is detected. The simulations results, carried out by MATLAB/Simulink, shows that the proposed method has a small non detection zone. Also, this method is capable of detecting islanding accurately within the minimum standard time.  Index Terms-islanding detection, active techniques, passive technique, NDZ

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A New Method of Generating TWACS®Type Outbound Signals for Communication on Power Distribution Networks

Cited by 40 publications

References 1 publication

System Frequency as Information Carrier in AC Power Systems

System Frequency as Information Carrier in AC Power Systems

A Power Line Signaling Based Scheme for Anti-Islanding Protection of Distributed Generators—Part II: Field Test Results

A Reliable Strategy in Order to Islanding Detection Based on Combined Active and Passive Techniques

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