Equivalent Model for Calculating Fault Current from Inverter-Interfaced Renewable Energy Generators

Liu, S. M.; Bi, Tianshu; Xue, Ancheng; Liu, J. Z.

doi:10.3808/jei.201800392

Cited by 3 publications

(2 citation statements)

References 24 publications

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“…The control loops are composed of inner current controller and outer voltage controller. The corresponding mathematical equation is written as [22,23]:…”

Section: Various Fault Response Characteristics Of Different Pvgusmentioning

confidence: 99%

Equivalent Model of Photovoltaic Power Station Considering Different Generation Units’ Fault Current Contributions

Liu

Zhang

et al. 2021

Energies

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The fault current calculation model of photovoltaic (PV) power stations is usually treated as a capacity weighted equivalent model of a single PV generation unit (PVGU). However, in the same PV power station, different PVGUs have various fault current characteristics. As a result, there are significant differences in fault current characteristics between a PVGU and a PV power station. It means that the existing capacity weighted equivalent model cannot be used for accurately describing the fault current contributions from a practical PV power station. In this paper, the fault behaviors of the PVGUs located at different access points of a PV power station are firstly analyzed. The difference in PVGUs’ fault current contributions is identified and reflected with the activation states of current limiters that are employed for PV inverters. The activation states are represented by a theoretical expression so as to distinguish the PVGUs’ fault contributions. Further, based on the proposed theoretical expression, a novel algorithm is developed for sorting all PVGUs included in a PV power station. The multi-machine calculation model is deduced in order to exactly express the fault current contribution from a PV station. Finally, some simulation tests are conducted. The tested results verify the effectiveness of the proposed calculation model. It can provide support for calculating the protection setting of power grid connected with large-scale PV stations.

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“…The control loops are composed of inner current controller and outer voltage controller. The corresponding mathematical equation is written as [22,23]:…”

Section: Various Fault Response Characteristics Of Different Pvgusmentioning

confidence: 99%

Equivalent Model of Photovoltaic Power Station Considering Different Generation Units’ Fault Current Contributions

Liu

Zhang

et al. 2021

Energies

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“…Besides the limited wind power resources, there are some other factors that restricted the development of wind power plants Liu et al, 2018c). In contrast to fossil fuels, wind power plants do not emit GHG to the atmosphere Ren et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

A GIS-based Decision-Making Support System for Wind Power Plant Site Selection, Case Study for Saskatchewan

Liu¹,

Guo²,

Baetz³

et al. 2019

J ENVIRON INFORM LET

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The increasing developments of wind power plants occur in many countries, which are used to mitigate the adverse effects of fossil fuels on the environment. In consideration of negative impacts, wind energy should be systematically analyzed in order to optimize the plans of governments and developers. A decision-making support system for wind power plant site selection was developed by using geographical information system in this study. The environmental, economic, and technical factors are invoked to generate the methodology. By comparing the overall performance index from the results, the best locations for wind power plants can be selected. The methodology was applied to the case study of Saskatchewan, where the development of wind power plant could be considered urgent. The results demonstrate that Saskatchewan has great potential for wind power energy development and southwest Saskatchewan is the most favorable area.

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Analysis of Current Differential Protection Considering Rated Capacity of Inverter-Interfaced Renewable Plant

Zhang¹,

Li²,

Liu

et al. 2022

Front. Energy Res.

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With the increasing capacity of grid-connected renewable energy power plants (REPPs), the fault current characteristics are remarkably altered. The limited amplitude and controlled initial phase angle of REPPs’ short-circuit current become highlighted. As a result, the differential current is no longer greater than restraint current on both sides of the protected devices when a fault occurs. It may lead to mal-operation of the current differential protection, which is used widely. It is necessary to demonstrate the cause-and-effect relationship between REPPs’ rated capacity and the protection adaptability. To solve this problem, the relationship between the rated capacity of inverter-interfaced REPP (IIREPP) and fault current amplitude, as well as its initial phase angle, is deduced first based on the IIREPPs’ fault behaviors. Further, by analyzing the influence of different rated capacity of REPPs on the ratio of operate to restraint current, the analytical expression of the IIREPP’s maximum rated capacity is deduced, which is suitable for analyzing the adaptability of differential protection. Finally, the simulation tests were carried out based on PSCAD/EMTDC. The test results show that the aforementioned expression is effective for evaluating the adaptability of current differential protection.

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Equivalent Model for Calculating Fault Current from Inverter-Interfaced Renewable Energy Generators

Cited by 3 publications

References 24 publications

Equivalent Model of Photovoltaic Power Station Considering Different Generation Units’ Fault Current Contributions

Equivalent Model of Photovoltaic Power Station Considering Different Generation Units’ Fault Current Contributions

A GIS-based Decision-Making Support System for Wind Power Plant Site Selection, Case Study for Saskatchewan

Analysis of Current Differential Protection Considering Rated Capacity of Inverter-Interfaced Renewable Plant

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