scholarly journals Transient angular stability on medium voltage distribution systems with distributed generation

2021 ◽  
pp. 1-8
Author(s):  
Luis CISNEROS-VILLALOBOS ◽  
José Gerardo VERA-DIMAS ◽  
Jorge Luis AGUILAR-MARIN ◽  
Julio Cesar VERGARA-VÁZQUEZ
Keyword(s):  
Distributed Generation ◽  
Distribution Systems ◽  
Dynamic Behaviour ◽  
Electric Sector ◽  
Electrical Grid ◽  
Medium Voltage ◽  
Three Phase ◽  
Study Results ◽  
The Stability

The dynamic behaviour of a 32 MW gas-turbine generating unit, connected to the 23 kV main busbar of a substation, is analysed in this article. The study is focused on the representative faults occurring in an electrical system and allows the determination of the maximum times in with a fault must be delivered to maintain the stability of generator. A three-phase power network is modelled with the Alternative Transients Program (ATP). Simulation results are reported and analysed for typical variables of interest such as machine rotor angle, frequency, and power. According to the study results, machine stability is greatly affected by three-phase faults, as compared to the dynamic behaviour under single-phase faults. The analysis carried out is useful to improve and maintain the security of operation of the electrical grid and in aligned to the current regulations and recent reforms of the Mexican electric sector. The fact that the performed study was usually not mandatory but has been pending since the commissioning of distributed generation plants in the Central Mexican Region is emphasized.

Determining the Norton’s Equivalent Model of Distribution System with Distributed Generation (DG) for Stability Analysis

2019 ◽  
Vol 12 (2) ◽  
pp. 190-198
Author(s):  
Sunny Katyara ◽  
Lukasz Staszewski ◽  
Faheem Akhtar Chachar
Keyword(s):  
Distributed Generation ◽  
Normal Condition ◽  
Distribution System ◽  
Distribution Networks ◽  
Equivalent Model ◽  
Stability Factor ◽  
Matlab Simulation ◽  
The Stability ◽  
Stability Issues

Background: Since the distribution networks are passive until Distributed Generation (DG) is not being installed into them, the stability issues occur in the distribution system after the integration of DG. Methods: In order to assure the simplicity during the calculations, many approximations have been proposed for finding the system’s parameters i.e. Voltage, active and reactive powers and load angle, more efficiently and accurately. This research presents an algorithm for finding the Norton’s equivalent model of distribution system with DG, considering from receiving end. Norton’s model of distribution system can be determined either from its complete configuration or through an algorithm using system’s voltage and current profiles. The algorithm involves the determination of derivative of apparent power against the current (dS/dIL) of the system. Results: This work also verifies the accuracy of proposed algorithm according to the relative variations in the phase angle of system’s impedance. This research also considers the varying states of distribution system due to switching in and out of DG and therefore Norton’s model needs to be updated accordingly. Conclusion: The efficacy of the proposed algorithm is verified through MATLAB simulation results under two scenarios, (i) normal condition and (ii) faulty condition. During normal condition, the stability factor near to 1 and change in dS/dIL was near to 0 while during fault condition, the stability factor was higher than 1 and the value of dS/dIL was away from 0.

scholarly journals A Novel Hybrid Active Anti-Islanding Method For Multi-Converter Fed Distributed Generation Systems

2021 ◽  
Author(s):  
Sasan Mostafaei
Keyword(s):  
Distributed Generation ◽  
Positive Feedback ◽  
Reactive Power ◽  
Renewable Energy Sources ◽  
Islanding Detection ◽  
Detection Scheme ◽  
Quality Degradation ◽  
Three Phase ◽  
Feedback Frequency ◽  
The Stability

This thesis presents a novel active anti-islanding detection scheme for the three phase gridconnected converters. The proposed hybrid method works based on the combination of Positive Feedback Frequency Shift (PFFS) and Reactive Power Variation (RPV) methods, and therefore it combines the features of both methods. Unlike the RPV scheme, this method is capable of synchronizing all power converters with each other in a distributed generation (DG) system. Therefore, it can effectively detect islanding when the DG system has multiple renewable energy sources interfaced to the system by multiple converters. The proposed method can also be combined with other active methods, such as the active frequency drift method. This minimizes the power quality degradation since the scheme is called upon only when 0.1Hz deviation in the grid frequency is detected. Moreover, unlike other positive feedback methods, this scheme has little impact on the stability of the DG system, since the positive feedback reference is only limited to

scholarly journals Assessment by Simulation of Different Topological Integration of Solar Photovoltaic Plant in Medium Voltage Distribution Networks

2021 ◽  
Vol 29 (2) ◽  
Author(s):  
Md. Milon Uddin ◽  
Mushfiqur Rahman ◽  
Md. Tanzid Ridwan Hossain ◽  
Md. Habibur Rahman
Keyword(s):  
Power Plant ◽  
Distribution Systems ◽  
Fossil Fuels ◽  
Induction Machine ◽  
Distribution Networks ◽  
Solar Photovoltaic ◽  
Voltage Distribution ◽  
Medium Voltage ◽  
Study Results ◽  
Photovoltaic Plant

Fossil fuels are diminishing day by day and are being utilized for various purposes like transportation, electricity generation, cooking and other uses which emits harmful gases. Global warming is increasing due to greenhouse gases. Sunlight is abundant compared to fossil fuels. Photovoltaic (PV) power plant could be one of the best techniques to lessen using of fossil fuels. Effect of different topological integration of solar photovoltaic plant in medium voltage distribution network had been analyzed in this research. Analysis had been done based on 1. loadability (capability of an electrical grid to run the connected load) 2. maximum power input. Fractioning (a way of splitting the total photovoltaic power generation into different size and number of plant) generation effect of PV generators in distribution systems had been found by a comparative study. Results show that change in loadability was due to placement and fraction of solar power plant in various buses. In addition, maximum input power of PV system varied with the placement of generation units among picked buses. Interaction among PV systems, and induction machine had been carried out and the result shows that interaction among PV and induction machine was different in terms of loadability because of fractioning. It had been found that change of loadability occurred due to fractioning and distribution of photovoltaic systems on different types of designed topology.

scholarly journals A Novel Hybrid Active Anti-Islanding Method For Multi-Converter Fed Distributed Generation Systems

2021 ◽  
Author(s):  
Sasan Mostafaei
Keyword(s):  
Distributed Generation ◽  
Positive Feedback ◽  
Reactive Power ◽  
Renewable Energy Sources ◽  
Islanding Detection ◽  
Detection Scheme ◽  
Quality Degradation ◽  
Three Phase ◽  
Feedback Frequency ◽  
The Stability

This thesis presents a novel active anti-islanding detection scheme for the three phase gridconnected converters. The proposed hybrid method works based on the combination of Positive Feedback Frequency Shift (PFFS) and Reactive Power Variation (RPV) methods, and therefore it combines the features of both methods. Unlike the RPV scheme, this method is capable of synchronizing all power converters with each other in a distributed generation (DG) system. Therefore, it can effectively detect islanding when the DG system has multiple renewable energy sources interfaced to the system by multiple converters. The proposed method can also be combined with other active methods, such as the active frequency drift method. This minimizes the power quality degradation since the scheme is called upon only when 0.1Hz deviation in the grid frequency is detected. Moreover, unlike other positive feedback methods, this scheme has little impact on the stability of the DG system, since the positive feedback reference is only limited to

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