Journal ArticleDOI
Probabilistic voltage stability assessment considering renewable sources with the help of the PV and QV curves
Adriano Batista de Almeida,Eliane Valenca De Lorenci,Rafael Coradi Leme,Antonio Carlos Zambroni de Souza,B.I.L. Lopes,Kwok Lun Lo +5 more
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TLDR
In this paper, the stability and reliability of voltage in a power system with distributed generation is analyzed using simulation techniques, and reliability theory is also considered in the proposed voltage collapse analysis methodology.Abstract:
The use of renewable energy sources has increased year-on-year. Thus, there is an increasing rate of small generating units connected directly to distribution networks and micro-grids close to consumers. At the same time, these micro-sources must provide stability and reliability of electrical energy to the power network to which they are connected. In the technical literature, several studies have been done to ensure power systems with traditional generating sources to operate in a stable and reliable way, but there is an issue regarding generation uncertainty when a distribution system has many micro-sources. This is because of the uncertainty of primary sources, for example, wind and radiation intensity, and could result in intermittent generation. In this study, stability and reliability of voltage in a power system with distributed generation is analysed using simulation techniques. In the proposed method in this study voltage security analysis is jointly considered with probability laws. Moreover reliability theory is also considered in the proposed voltage collapse analysis methodology. The responsibility of generator in the voltage collapse process, the probabilistic risk of voltage collapse of each operating point and the probability of enlarging the system load as a function of different operating points are the outcome of the methodology, and it is validated by using the IEEE34 test feeder.read more
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Journal ArticleDOI
Optimal allocation and sizing of DG units considering voltage stability, losses and load variations
TL;DR: In this paper, a modified form of ICA was used to solve the optimization problem to minimize active power losses and enhance voltage stability margin considering load variations, and the proposed method is applied to 34-bus and 69-bus test systems and the results are compared with the results obtained from cuckoo search algorithm in order to validate the proposed methodology.
Journal ArticleDOI
Existing approaches and trends in uncertainty modelling and probabilistic stability analysis of power systems with renewable generation
TL;DR: A critical assessment and classification of the available probabilistic computational methods that have been applied to power system stability assessment (including small and large disturbance angular stability, voltage and frequency stability) is provided in this paper.
Journal ArticleDOI
Voltage stability assessment and enhancement of power grid with increasing wind energy penetration
TL;DR: In this paper, the effects of increasing Doubly-Fed Induction Generator-based Wind Energy Conversion System (DFIG-WECS) penetration in the power system have been investigated.
Journal ArticleDOI
Voltage security in AC microgrids: a power flow-based approach considering droop-controlled inverters
Antonio Carlos Zambroni de Souza,M. V. Santos,Miguel Castilla,Jaume Miret,Luis Garcia de Vicuna,Diogo Marujo +5 more
TL;DR: In this paper, a special power flow program is developed in order to consider the effects of the droop-controlled inverters, and a load margin calculation is incorporated into a microgrid structure.
Journal ArticleDOI
Risk-Averse Preventive Voltage Control of AC/DC Power Systems Including Wind Power Generation
TL;DR: In this paper, the authors proposed a new stochastic preventive voltage control (SPVC) model for power systems operation, taking into account the uncertainties of wind power generation.
References
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Distributed generation technologies, definitions and benefits
TL;DR: In this article, the authors introduce a survey of this revolutionary approach of DGs, which will change the way electric power systems operate along with their types and operating technologies, and survey the operational and economical benefits of implementing DGs in the distribution network.
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Optimal distributed generation allocation for reliability, losses, and voltage improvement
TL;DR: In this article, the authors present a methodology for optimal distributed generation allocation and sizing in distribution systems, in order to minimize the electrical network losses and to guarantee acceptable reliability level and voltage profile.
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Optimal Distribution Voltage Control and Coordination With Distributed Generation
TL;DR: In this paper, the optimal control of distribution voltage with coordination of distributed installations, such as the load ratio control transformer, step voltage regulator (SVR), shunt capacitor, shunt reactor, and static var compensator, is proposed.
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Future development of the electricity systems with distributed generation
TL;DR: In this article, a development of active distribution network management, from centralised to more distributed system management, is needed, and some innovative concepts such as microgrids and virtual utilities are presented.
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A Control Strategy for Islanded Microgrids With DC-Link Voltage Control
TL;DR: In this paper, an alternative control strategy is proposed based on the specific characteristics of islanded low-voltage microgrids, where the microgrid power is balanced by using a control strategy that modifies the set value of the rms microgrid voltage at the inverter ac side as a function of the dc-link voltage.