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Existing approaches to the design, control and operation of 11 kV distribution networks often restrict optimal utilization. When confronting the increasing demand and growing amount of distributed generation being connected to the networks, it is essential for distribution system operators to employ new and more active network management practices. This paper presents and discusses a range of active...
Traditionally, most of the generation plants in the countries all over the world are constituted of big hydro or thermal generating units, which are subjected to grid codes minimum requirements concerning their operation either in normal or under emergency conditions. Such minimum requirements are intended to guarantee reliability and an economic and safe operation. With the rising of new renewable...
This paper presents a new integrated protection relay and its associated scheme for distributed generation systems. In the scheme, an integrated relay is responsible for the protection of both line sections associated with the substation bus. Based on conventional directional overcurrent protection technique, the basic principle of the new relay is to determine whether a fault is on the protected...
Renewable energy driven distributed generators (DGs) are mostly connected to radial distribution network with overhead feeders. It is estimated that 80% of network faults are temporary single phase to ground faults and therefore automatic restoration is required. A combination of automatic re-closer devices, circuit breaker, sectionalizer and fuse is applied to clear the temporary fault and isolate...
This paper describes the initial development and testing of an islanding detection scheme in conformance with the IEEE 1547 standard for interconnecting distributed resources with electric power systems. The islanding detection algorithm involves adding a perturbation signal to the throttle of a distributed generator (DG). Deviations in DG electrical frequency caused by the perturbation signal are...
This paper presents new explorations into the use of agent technology applied to substations protection coordination of power system. The impact of distributed generation on protection is firstly discussed. Then a coordination multi-agent system is proposed with the functions of the agents described. In the proposed system, communication will play an important role to provide more information for...
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