Distributed generation access is one of the key technologies in building smart grid. This paper added distributed power grid and energy storage system connected to the grid two indicators to current power quality asse...
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SVC is an effective method to promote the transmitting capacity of transmission line and stabilize the voltage, it can also damp the low-frequency swing. But the control system of SVC is only based on local informatio...
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In traction power supply system of China High-speed Railway, the transient process of EMU has a great difference between the state of passing by Phase-separation with electric load and passing by Phase-separation with...
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In order to solve the problem of incompatibility among DTUs from different manufacturers, and to achieve good interoperability between the DTU and other IED equipments, IEC 61850 is adopted to establish DTU models. IE...
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power hardware-in-the-loop (PHIL) simulation is an advanced testing method with flexibility and fidelity. A PHIL system connects power hardware or physical models under test to a real-time simulator through an interfa...
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Because of ageing of PT insulation in the present intelligent boundary switch, accidents, such as explosion, even life casualties, often happen. This article aims to study a new type of intelligent boundary switch for...
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In the digital substation construction, small-signal output of the integrated electronic transducer used in low-voltage substation equipment, without the second conversion, with the wiring simple, space-saving, easy m...
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High Impedance Faults (HIFs) can differ one from another enormously starting from single flashes through arcing faults to permanent ones. New approach to HIF detection is presented in this paper allowing for identific...
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ISBN:
(纸本)9781424496228
High Impedance Faults (HIFs) can differ one from another enormously starting from single flashes through arcing faults to permanent ones. New approach to HIF detection is presented in this paper allowing for identification of two latter ones. The novel protection methodology 3D powerprotection scheme (3DPPS) was developed to do the job. The proposed solution is fully adaptive and does not require the knowledge of system parameters. The identification of a fault is based on monitoring voltage or current signals and their three phase symmetry deviations which carry all necessary information on the actual state of the protected system.
Multi-bay information sharing has very important significances for the the enhancing of the relay characteristics and improving of the system control methods. With the summary of distribution substation busbar protect...
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The amount of Distributed Generation (DG often from renewable energy sources) connected to the UK powersystem is increasing. This increase has the potential to affect the reliability of protectionsystem operation (a...
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ISBN:
(纸本)9781424496228
The amount of Distributed Generation (DG often from renewable energy sources) connected to the UK powersystem is increasing. This increase has the potential to affect the reliability of protectionsystem operation (a number of instances of protection maloperation have already been experienced [1]). Issues associated with protection that have previously been considered in the literature include: blinding of protection, false tripping (sympathetic tripping), increased or decreased grid infeed levels, unwanted islanding and failure of auto-reclosers [2, 3]. The main focus of this paper is the protection cascade tripping effect caused by sympathetic undervoltage tripping of DG interface protection for network faults at the distribution level. This paper aims to comprehensively investigate and quantify the conditions at which sympathetic under-voltage tripping occurs.
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