Planning Sensitivities for Building Contingency Robustness and Graph Properties into Large Synthetic Grids

Interest in promoting innovation for large, high-voltage power grids has driven recent efforts to reproduce actual system properties in synthetic electric grids, which are fictitious datasets designed to be large, complex, realistic, and totally public. This paper presents new techniques based on system planning sensitivities, integrated into a synthesis methodology to mimic the constraints used in designing actual grids. This approach improves on previous work by explicitly quantifying each candidate transmission line’s contribution to contingency robustness, balancing that with geographic and topological metrics. Example synthetic grids build with this method are compared to actual transmission grids, showing that the emulated careful design also achieves observed complex network properties. The results shed light on how the underlying graph structure of power grids reflects the engineering requirements of their design. Moreover, the datasets synthesized here provide researchers in many fields with public power system test cases that are detailed and realistic

Location-Dependent Impacts of Resource Inertia on Power System Oscillations

Inertial responses are seen by the system as the injection or withdrawal of electrical energy, corresponding to a change of frequency. The inertia of a machine primarily contributes to the power system transient stability. Oscillations are always present in the bulk power system due to the electromechanical nature of the grid. Poorly damped oscillations may cause system instability. Thus, this paper aims to study inertia\u27s impacts on system primary frequency response, in particular on system oscillation modes. Both transient stability simulations and modal analysis are performed to provide insights into the extent to which inertia and its location influence the system oscillation behavior. Simulation results using both a small-scale test system and a large-scale synthetic network dynamic model are presented to verify the locational impacts of resource inertia

Iterative Matrix Pencil Method for Power System Modal Analysis

This paper introduces a modal analysis approach termed as the Iterative Matrix Pencil method. It uses the Matrix Pencil Method as the primary tool for mode identification, and adds to it by utilizing the concept of a cost function in order to reduce the number of signals needed to identify the modes for a large system. The method is tested for a variety of large synthetic power grids in this paper, with the cost function being reported to measure accuracy. A sensitivity analysis is also considered, showing how this new method behaves when adjusting the two primary user-based inputs; the number of iterations, and the SVD threshold

Sponsor networks and business relations orchestrated by team sport clubs

Purpose  This study investigates firms’ reasons and motives for becoming sponsors and how they benefit from this networking engagement by exploring sponsorship networks associated with two Danish team sport clubs – a Premier League football club and a second-division handball club.  Design/methodology/approach  Two online surveys were conducted with firms associated with the networks during the autumn and winter of 2013/14 (N=116). The questionnaire was theoretically anchored in existing sponsorship literature, business network research and social capital theory.  Findings  The results show that business logics were the dominating reasons for joining the network. A large proportion of the respondents reported having increased their number of business (32%) and social (26%) relations with other network members after joining the network. Furthermore, 37% of the respondents reported having made business agreements with companies external to the network via network contacts, which supports ideas of bridging social capital. More than half the respondents (59%) preferred doing business with network members rather than with non-members.  Originality/value  By investigating a local and regional sport-club context, the paper adds to our knowledge about sponsorship networks. It emphasizes the potential importance of team sport clubs for the business landscape, thus maintaining that sport clubs fulfill an important role for local communities beyond being mere entertainment industries

An Approach for the Direct Inclusion of Weather Information in the Power Flow

While it is widely recognized that weather impacts the power flow, historically weather information has only been implicitly included. This paper presents an approach for the direct inclusion of weather information in the power flow. Key issues addressed by the paper include the availability of weather information, the mapping of weather information to electric grid components, a flexible and extensible modeling approach for relating weather values to the power flow models, and the visualization of the weather impacts. The approach is demonstrated on several electric grids ranging in size from 7000 to 82,000 buses using weather data over several different years