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Wind turbines are rapidly increasing and some times are disconnected from the grid intentionally or inadvertently and continue to supply local loads. If it was decided to reconnect to the grid, some problems may happen. This paper deals with the reconnection of islanded wind turbines to the grid and proposes a new method to reduce the high current effects of reconnection. The new method is simple...
Selection of the DG interconnection protective relay is based on several criteria such as power system characteristics, the dynamic response of the generator, the system grounding, the DG transformer connection, etc., as well as the protection policy of the utility and coordination requirements. The interconnection protection IED design can be summarized as follows: Disconnection of DG plants when...
Distributed generation (DG) is gaining popularity in the United States and across the world. The Florida Public Service Commission recently passed rules encouraging the use of renewable resources. Integrating DG with the utility network poses challenges for anti-islanding schemes. These schemes detect islanding conditions and trip the DG. Fig. 1 shows a typical network configuration for DG installations...
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...
Interconnect protection allows DG to operate in parallel with the utility power system and is the single most important technical issue in most DG projects. Typically, protection requirements to connect distributed generators to the utility grid had been established by each utility. These guidelines generally cover smaller distributed generators (10 MW or less), which are usually connected to the...
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