Power system security analysis: Applications for wind power allocations and smart islanding
Examensarbete för masterexamen
Power system reliability is the overall objective in power system design and operation. It includes two main aspects: adequacy and security. During the last decades, outages and blackout emerged more and more frequently which affected the normal consumption of consumers. In order to meet the increase the power system security, a self-healing grid is needed to monitor and response to the change within the whole network in time. Smart islanding is considered as an effective way to prevent small outages in the system from propagating into big blackout. In this paper, two common methods used to find the islands are introduced and the formation of islands was conducted by a C++ minimal cutset algorithm based program which was implemented on the platform of Dev cpp in the simulation part, moreover the proposed approach was applied to a Nordic 32-bus test system and was used to save the network from voltage collapse. On the other hand, since the large amounts of sustainable resources are being widely used by taking into account of the ever-increasing load demand throughout the world, people are exploring new resources to replace the existing non-renewable resources. As one of the renewable energy, wind power, draws people‟s attentions more and more. Renewable resource generation connected to the existing network will incur plenty of problems which will decrease the power system reliability. The wind energy injection will probably induce transmission overloaded problem which reduce the power system adequacy. It is critical to allocate the wind energy optimally. In order to find good locations to set up large-scale wind power projects, a Weighted Transmission Loading Relief (WTLR) / Equal Transmission Loading Relief (ETLR) sensitivity was introduced in this work to help find the positions of injecting the wind power so that the increasingly load demand can be satisfied as well as reduce the contingency overloads within the system to enhance the power system reliability.
Elkraftteknik , Electric power engineering