DC Transmission Terminating at Low Short Cirucit Ratio Locations

Krishnayya, P. C. S.; Piwko, R.J.; Weaver, Thomas; Bahrman, M.; Hammad, A. E.

doi:10.1109/tpwrd.1986.4308008

Cited by 18 publications

(6 citation statements)

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“…If the grid impedance is low, then the PCC voltage is in phase with the grid voltage. In case of weak grid [45][46][47][48][49][50][51][52][53][54], the grid impedance can be rather high, which changes the phase of the PCC voltage to deviate from the phase of the grid voltage depending on the level of the power supplied by the inverter [51][52][53]. In practice, this means that the inverter seems to supply reactive power into the grid even if the inverter output power is pure real power at PCC [53].…”

Section: Introductionmentioning

confidence: 99%

Impedance-Based Interactions in Grid-Tied Three-Phase Inverters in Renewable Energy Applications

et al. 2019

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Impedance-ratio-based interaction analyses in terms of stability and performance of DC-DC converters is well established. Similar methods are applied to grid-connected three-phase converters as well, but the multivariable nature of the converters and the grid makes these analyses very complex. This paper surveys the state of the interaction analyses in the grid-connected three-phase converters, which are used in renewable-energy applications. The surveys show clearly that the impedance-ratio-based stability assessment are usually performed neglecting the cross-couplings between the impedance elements for reducing the complexity of the analyses. In addition, the interactions, which affect the transient performance, are not treated usually at all due to the missing of the corresponding analytic formulations. This paper introduces the missing formulations as well as explicitly showing that the cross-couplings of the impedance elements have to be taken into account for the stability assessment to be valid. In addition, this paper shows that the most accurate stability information can be obtained by means of the determinant related to the associated multivariable impedance ratio. The theoretical findings are also validated by extensive experimental measurements.

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Section: Introductionmentioning

confidence: 99%

Impedance-Based Interactions in Grid-Tied Three-Phase Inverters in Renewable Energy Applications

et al. 2019

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“…Low SCR values are usually an indicator for weak AC networks [1, 2]. In [3], it was experimentally demonstrated that special care is required when connecting WTs to such networks.…”

Section: Introductionmentioning

confidence: 99%

Process and tools for optimising wind power projects connected to weak grids

Trevisan¹,

Mendonça²,

Fischer³

et al. 2017

IET Renewable Power Generation

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Integration of wind power plants (WPPs) into weak electric grids has gained a lot of interest in recent years due to an increase in sites with low short-circuit power at the point of connection. In response to this reality, wind turbine (WT) manufacturers have been working on developing suitable technical functionalities. However, it can be argued that technology is not the only challenge faced during the interconnection of WPP to a weak grid. This study aims at proposing and demonstrating the application of a process that can be applied to optimise many aspects of such projects and outlines the tools needed to do so. Outcomes and experiences from applying this process and its tools to a real project including steady-state and time-domain simulation results are also presented. It is shown that, in order to successfully interconnect WPPs into weak grids without putting power system safety and reliability at risk, strong collaboration between project developers, network operators, consultants and WT manufacturers is crucial. The proposed process will greatly support all stake holders involved in developing the market of WPPs connected to weak grids.

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“…Extensive work has been conducted within CIGRE and IEEE to analyse voltage stability for ac/dc systems with LCC‐HVdc transmission [1–3]. The concepts of maximum power curves (MPCs) and maximum available power (MAP) were investigated for LCC‐HVdc systems in earlier work on this subject [4–12]. However, the voltage and power stability limit for voltage sourced converter (VSC)‐based HVdc transmission has not yet been fully addressed, and as this paper suggests, needs more work.…”

Section: Introductionmentioning

confidence: 99%