Grid Support of Small-scale PV Generators with Reactive Power Injection in Distribution Systems

Vargas, Moya; Mendes, Mariana Altoe; Tonini, Luiz G. R.; Batista, Oureste Elias

doi:10.1109/isgt-la.2019.8895424

Cited by 4 publications

(7 citation statements)

References 9 publications

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“…The parameters obtained above are used to calculate the current İn in every line of the system, as shown in (11). In the first iteration, the node voltages are equal to the reference voltage and, after that, the node voltage updated is obtained in (12), considering the transformation ratio α n and impedance Z t n of transformers and voltage regulators.…”

Section: Methods For Power Flowmentioning

confidence: 99%

“…The impedance matrix method uses the line Equations ( 10) and (11), thus considering a system with n nodes and x being the fault point; the calculation starts with the determination of the Z eq abc impedance matrix, from source to shorting point, obtained by calculating the Thevenin equivalent impedance, Z Th x , with the sum of the line impedances Z l abcn , as shown in (15). The post-fault source voltage, Vsabc , will be obtained from (16), where İf abc is the fault current, Z f abc is the fault impedance, Vf abcx is the fault point voltage, Vf gx is the reference line to ground fault voltage, and VGD abc is the voltage of one of the generators of the n-node system.…”

Section: Methods For Short Circuitmentioning

confidence: 99%

“…The chosen DG model to implement the methods is a voltage-controlled current source because it provides higher processing speed and agile implementation to obtain the power flow and short circuit [11]. This model is depicted in Equation (1), where the electrical quantities provided by the DG are İ * DG n as current, P DG n ∠φ as the active power, and Vn as node voltage.…”

Section: The Dg Modelmentioning

confidence: 99%

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Load Flow and Short-Circuit Methods for Grids Dominated by Inverter-Based Distributed Generation

2022

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The use of power-electronics-based devices in distribution generation seeks to improve energy quality and reduce costs. The inverter-based distributed generator, that works in different operation modes, has emerged as a promising technology. In a high distributed generation penetration scenario it is important to know the voltage profile and fault information due to the uncertainty in the generator operation and the impact that have on the network. This study aims to use two proposed methods of analysis: for power flow, based on backward/forward sweep method, and short-circuit, based on hybrid impedance matrix, that considers the inverter operation modes and represents each generator as a voltage-controlled current source. The chosen network is the IEEE 34-Node Test Feeder with a generator on each load per phase. The voltage profiles obtained will be validated with a Simulink/Matlab phasorial model. The results show an average error of 2.39% and a gain in voltage profile processing time of 2185.24%, making its use consistent for larger systems.

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Section: Methods For Power Flowmentioning

confidence: 99%

Section: Methods For Short Circuitmentioning

confidence: 99%

Section: The Dg Modelmentioning

confidence: 99%

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Load Flow and Short-Circuit Methods for Grids Dominated by Inverter-Based Distributed Generation

2022

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“…Solar plants inject generally reactive power components for voltage support. In [73], reactive power is injected to support line-to-ground and three line-to-ground faults. In [74], the effect of injecting negative sequence reactive current into the grid in case of asymmetrical faults is investigated.…”

Section: Voltage Supportmentioning

confidence: 99%

“…But, considering the growth of PV systems and other renewable energies connected to power grid, current grid codes are adapting new impositions to mandate that distributed energy resources have specific grid support functions. This is why power inverters must be incorporate control solutions to operate while managing anti-islanded protections, voltage/frequency ride-through, and active/reactive power control during perturbations [73]. In order to satisfy grid codes regulations, control package must be include controls of voltage, frequency, active power, reactive power reference and power factor [79,98].…”

Section: Identified Findingsmentioning

confidence: 99%

A Review of Control Techniques in Photovoltaic Systems

et al. 2020

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Complex control structures are required for the operation of photovoltaic electrical energy systems. In this paper, a general review of the controllers used for photovoltaic systems is presented. This review is based on the most recent papers presented in the literature. The control architectures considered are complex hybrid systems that combine classical and modern techniques, such as artificial intelligence and statistical models. The main contribution of this paper is the synthesis of a generalized control structure and the identification of the latest trends. The main findings are summarized in the development of increasingly robust controllers for operation with improved efficiency, power quality, stability, safety, and economics.

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Alteração nas correntes de curto-circuito com elevada integração de geração distribuída fotovoltaica

Amauri Cesar Cristofano Junior,

Matheus Dos Reis Bravim,

Oureste Elias Batista

2022

Proceedings IX Simpósio Brasileiro De Sistemas Elétricos

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With the advancement of technology, lower prices and low environmental impacts, the use of photovoltaic generators is becoming increasingly viable, studying the effects of the high integration of photovoltaic generators in the electrical system, on short-circuit currents, for example, they will indicate that the electrical system will need to prepare to avoid or mitigate such effects. One of the most used and efficient ways to analyze the effects caused by the massive insertion of photovoltaic generators is to carry out studies in computer simulators, such as OpenDSS and Pycharm software, which mathematically simulate circuits, calculate short-circuit currents and automate and the insertion of photovoltaic generators in different scenarios. With this variety of data and scenarios generated, the behavior of the studied systems is very close to reality. In this study, the single-phase and three-phase short-circuit currents were analyzed, verifying the greatest variation during the insertion of photovoltaic distributed generation in the points of the system which have loads. The photovoltaic generators will be inserted in different ways and the short circuit currents will be calculated at each insertion. Resumo: Com o avanço da tecnologia, diminuição dos preços e baixos impactos ambientais, a utilização de geradores fotovoltaicos está se tornando cada vez mais viável, estudar os efeitos da elevada integração de geradores fotovoltaicos no sistema elétrico, variações nas correntes de curto-circuito, por exemplo, indicarão que o sistema elétrico precisará se preparar para evitar ou mitigar tais efeitos. Uma das maneiras mais utilizadas e eficientes para analisar os efeitos causados pela inserção massiva de geradores fotovoltaicos é a realização de estudos em simuladores computacionais, como os softwares OpenDSS e Pycharm, que simulam matematicamente os circuitos, calculam as correntes de curto-circuito e automatizam e a inserção de geradores fotovoltaicos em cenários diferentes. Com esta variedade de dados e cenários gerados, o comportamento dos sistemas estudados fica muito próximo a realidade. Neste estudo foram analisadas as correntes de curto-circuito monofásicas e trifásicas, verificação da maior variação durante a inserção de geração distribuída fotovoltaica nos pontos do sistema os quais possuírem cargas. Serão inseridos os geradores fotovoltaicos de maneiras diferentes e calculadas a correntes de curto circuito a cada inserção.

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Grid Support of Small-scale PV Generators with Reactive Power Injection in Distribution Systems

Cited by 4 publications

References 9 publications

Load Flow and Short-Circuit Methods for Grids Dominated by Inverter-Based Distributed Generation

Load Flow and Short-Circuit Methods for Grids Dominated by Inverter-Based Distributed Generation

A Review of Control Techniques in Photovoltaic Systems

Alteração nas correntes de curto-circuito com elevada integração de geração distribuída fotovoltaica

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