Electrical power engineering education down under : Australia and New Zealand are adding energy to their University Curricula
- Authors: Nair, Nirmal , Martin, Daniel , Saha, Tapan , Islam, Syed , Watson, Neville
- Date: 2018
- Type: Text , Journal article
- Relation: IEEE Power and Energy Magazine Vol. 16, no. 5 (2018), p. 64-73
- Full Text: false
- Reviewed:
- Description: On 4 August 1888, Reefton became the first town in New Zealand to have its own public electricity supply powered by hydrogeneration. In Australia, the first supply of electricity to the public at large was in two small country towns in New South Wales. Tamworth, with a population of 3,000, switched on arc and incandescent street lighting on 9 November 1888. In April 1889, the smaller town of Young switched on its incandescent street lighting and shortly thereafter went on to connect shops, offices, and homes within reach of its lines. However, the history of electricity supply in Australia traces back earlier, with Brisbane as one of the first cities in Australia to use electricity commercially, in 1882. Thus, electricity utilization down under coincided with the history of its emergence among the countries of the Northern Hemisphere.
Reintegration-based controlled islanding considering fast and slow active/reactive corrective actions to enhance frequency and transient voltage stabilities
- Authors: Ghamsari-Yazdel, Mohammad , Amjady, Nima , Reza Najafi, Hamid
- Date: 2021
- Type: Text , Journal article
- Relation: Electric power systems research Vol. 193, no. (2021), p. 107018
- Full Text: false
- Reviewed:
- Description: •A new reintegration-driven ICI framework, called R-ICI, is proposed.•The proposed R-ICI model improves frequency stability of islands using ESSs.•Transient voltage stability of islands is improved using ESSs and SVCs.•The interaction between frequency and voltage is considered by a linear IFR model.•An active/reactive charging and discharging scheme is introduced for ESSs. In this paper, a reintegration-based multi-objective intentional controlled islanding (ICI) model is proposed to enhance resiliency of electrical power systems under catastrophic events. This remedial measure plan relies on a mixed-integer linear programming model with two objective functions including reintegration risk and total load shedding value. While ensuring that each island includes only coherent generators, the proposed multi-objective model solves the controlled islanding problem using lexicographic optimization approach. To ease the islands’ reintegration, charging reactive power, reliability, capacity, and power flow disruption of transmission lines are considered in the model. After implementation of controlled islanding, each resulted island may face temporary active/reactive load-generation imbalance, which may put the islands at the risk of frequency instability, transient voltage instability or a combination of both. The proposed model reduces these risks by modeling energy storage systems (ESSs) and static VAR compensators (SVCs) as fast corrective control actions. In addition to modeling voltage dependent loads in the controlled islanding problem, a linear island frequency response (IFR) model is proposed for frequency stability assessment. The test results of the proposed ICI model on the IEEE 39-bus and IEEE 118-bus test systems demonstrate its performance.
Evaluating resiliency of electric power generators against earthquake to maintain synchronism
- Authors: Sayarshad, Hamid R. , Sabarshad, Omid , Amjady, Nima
- Date: 2022
- Type: Text , Journal article
- Relation: Electric power systems research Vol. 210, no. (2022), p. 108127
- Full Text: false
- Reviewed:
- Description: •A new dynamic generator resiliency model against earthquake is presented.•Nonlinear and time-variant behavior of earthquake disturbance is modeled.•Energy transfer of earthquake to mechanical input power of generator is modeled.•Synchronism status of generators impacted by an earthquake is determined.•The proposed model is tested using real-world data. Natural disasters, such as earthquakes, can cause significant disruptions in power systems, such as loss of generations and loads. To evaluate the behavior of a generator to remain in synchronism, subjected to the large disturbance of an earthquake, we propose a dynamic generator resiliency model. The proposed approach models the effects of earthquake energy transfer to a generator considering the time-variant behavior of earthquake disturbance. In addition, the proposed model analyzes the transient behavior of generators impacted by an earthquake considering earthquake ground acceleration and generators’ dynamic characteristics. Using this model, we can determine synchronism status of impacted generators and transient stability status of a power system in response to an earthquake. The proposed approach is tested using real-world data including the data of a real earthquake occurred on a real power plant. The obtained results illustrate the effectiveness of the proposed model to correctly predict the impact of an earthquake on a power plant, and to determine the effects of earthquake magnitude and generator robustness (in terms of generator inertia and damping torque) on the response of a generator to an earthquake.
Maximizing the utilization of existing grids for renewable energy integration
- Authors: Ranjbar, Hossein , Kazemi, Mostafa , Amjady, Nima , Zareipour, Hamidreza , Hosseini, Seyed
- Date: 2022
- Type: Text , Journal article
- Relation: Renewable energy Vol. 189, no. (2022), p. 618-629
- Full Text: false
- Reviewed:
- Description: This paper presents a new model to maximize the utilization of existing transmission system infrastructure by optimally sizing and siting the future developments of variable renewable energy sources (VRES). The model tries to maximize the integration of VRES in power systems with minimum expected energy curtailment without relying on new investments in the transmission systems. The proposed model is formulated as a linear stochastic programming optimization problem where VRES output scenarios are generated such that their spatio-temporal correlations are maintained. The Progressive Hedging Algorithm (PHA) with bundled scenarios is utilized to solve the proposed model for large-scale cases. The proposed model is tested on the modified Garver 6-bus and IEEE 118-bus test systems, and its results are compared with the results of the conventional VRES integration model. These results and comparisons illustrate the effectiveness of the proposed approach in terms of maximizing VRES integration and enhancing computational performance.