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In this paper a procedure for estimating the inertial frequency response of a power system with high wind energy penetration is presented, and the influence of the wind power fluctuations on the variability of the inertial response is analyzed. The procedure is based on the accuracy of the disturbance start-time detection and the frequency's rate of change. An algorithm for estimating the disturbance...
Microgrids are poised to become a major worldwide development in light of the numerous benefits they offer. However, the control and management of such systems require keen attention, as stability issues in microgrids have proven to be an important topic of research. It is a point of emphasis, that microgrids operating as stand-alone systems are particularly unforgiving in the sense that the combined...
The Tasmanian transmission network is owned and operated by Transend Networks Pty Ltd and is connected to mainland Australia through the Basslink HVDC interconnector. The increasing amount of non-synchronous generation supplying the Tasmanian load has resulted in the need to re-evaluate network security risks due to the changes in system dynamic behaviour. Following certain network contingencies,...
This paper presents some of the issues being encountered in the system frequency regulation function when the penetration level of wind energy in the electric grid increases considerably. Enhanced share of wind energy in the system mix will result in a proportional reduction of the conventional generating capacity. The traditional synchronous generators, which form the backbone of large power system,...
This paper details the investigation of a large frequency excursion of 2.28 Hz, experienced in the New Zealand power system on 1st August 2009 when the HVDC interconnector tripped, resulting in a power deficiency in South Island power system. A major portion of the spinning reserve to cover for this contingent event was provided by generating units operated in Tail Water Depressed (TWD) mode which...
This paper provides statistical analysis of frequency response characteristic of the Irish Electric Power System as function of increasing wind power penetration. This analysis is based on 3-year (2007-2009) record data of unit trips at different conditions of the system including variation of wind generation. The analysis is carried out in terms of dynamic stiffness assessment and prediction of initial...
A Wind penetration Secure level Assessment Tool (WSAT) is currently being developed by EirGrid Pic and Powertech Labs Inc that will help maximising use of its wind power generation while maintaining secure operation of the Irish power system. The tool is based on voltage and transient security analysis of transfers between wind and conventional power generation. In on-line WSAT application WSAT obtains...
400 kV Rourkela-Raipur double circuit 412 km long inter-regional link between Eastern and Western Regions has been established for operation of both the regions in synchronism for the first time in India. This paper briefly discusses the results of the various studies carried out to establish the feasibility of synchronous interconnection between these two regions having different capacity. Major...
A 3-D finite-element model of a dry human tibia has been developed to predict its natural frequencies of vibration. Analytical results were compared with experimental results obtained with a dual spectrum analyzer. The influence of boundary conditions and geometric properties such as inertia and length are eliminated by the finite-element model. The difference between the theoretical and experimental...
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