Digital Commons Network^™

Using Flexsim® To Simulate The Complex Strategies Of Longwall Mining Production Systems, Dalin Cai

University of Wollongong Thesis Collection 1954-2016

Longwall mining operations are complex systems which involve numerous interrelated activities. This thesis is an attempt to establish a simple yet effective methodology using discrete event simulation to identify primary constraints in the longwall mining process and to assess the effect that modifications to the system have on elevating a particular constraint without having to implement the change in situ.

A model of potential longwall mining systems, including roadway development technologies and practices, was developed using Flexsim® simulation software. The simulation model was structured such that it can be configured to most longwall layouts, with cutting and development sequences matching …

Clustering In Vanets Under Realistic Channel Conditions, Craig Stephen Cooper

University of Wollongong Thesis Collection 1954-2016

A Vehicular Ad hoc Network (VANET) differs from conventional wireless networks by its lack of infrastructure. Cars equipped with wireless devices must harmonise their transmissions in order to achieve the objectives of the network. Clustering serves as a means of doing so, by grouping vehicles according to spatial distribution and relative velocity. These groups, led by an elected cluster head, can serve as the foundation of routing, collision detection, and infotainment applications. After more than twenty years of research, clustering has diversified into a wide array of approaches and mechanisms, all of which have the potential for wide-spread application. However, …

Distribution Protection In A Modern Grid Embedded With Renewable Energy Resources, Joel Kennedy

University of Wollongong Thesis Collection 1954-2016

The advent of inverter-interfaced, decentralised generation has incited a paradigm shift in distribution network design philosophy. Accordingly, the effects of decentralised gener- ation on distribution network power quality, stability and protection have become impor- tant topics within research. Whilst the focus of this Thesis is protection design philosophy amidst increasing decentralised generation, protection efficacy is indelibly linked to power quality and stability. Ergo, it is prudent that all three areas of research interest are examined.

The motivation for this Thesis is to overcome some of the technical constraints that pre- vent the continued proliferation of decentralised energy resources. Further, this …