Comparative stability analysis of LCC, MMC and dualinfeed HVDC operating with weak AC network

Kovacevic, Stefan; Jovcic, Dragan; Despouys, Olivier; Rault, Pierre

doi:10.1109/pesgm41954.2020.9281570

Cited by 5 publications

(6 citation statements)

References 7 publications

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“…For high total loading, the 6.3 Hz mode can even become unstable. This conclusion is consistent with other stability studies of interactions between HVDC controllers and weak grids, which concludes that high PLL gains at inverter may cause stability issues [14], [15].…”

Section: B Impact Of Hvdc Controller Gainssupporting

confidence: 91%

“…With the benefits of MMC, and considering many existing LCC HVDC, we expect to see a mix of MMC and LCC (hybrid dual-infeed HVDC system) interconnecting the same AC grids. This topic is of further interest since studies have indicated that MMC, in either HVDC transmission link or static synchronous compensator (STATCOM) application, may have a beneficial impact on the stability and performance of the LCC [13], [14]. However, previous studies have not examined three-way LCC-MMC-generator torsional interactions, while grid operators are raising new SSTI concerns caused by the combined effect of the two HVDC links.…”

Section: Introductionmentioning

confidence: 99%

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Three-way Subsynchronous Torsional Interactions Between LCC HVDC, MMC HVDC and a Thermal Generator

Kovacevic,

Jovcic,

Rault

et al. 2023

Journal of Modern Power Systems and Clean Energy

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This paper performs a study on three-way subsynchronous torsional interactions (SSTI) between a hybrid dual-infeed high-voltage direct current (HVDC) system and a nuclear generator. The test case is based on the French IFA2000 line commutated converter (LCC) HVDC (2 GW) and the new Eleclink modular multilevel converter (MMC) HVDC (1 GW) interacting with the Gravelines generator (1 GW). The analysis is performed by the means of the eigenvalue stability assessment on an analytical model, while the accuracy of the conclusions is verified using the detailed non-linear electromegnetic transient program (EMTP) model. The study shows that the dual-infeed system may introduce higher risk of the SSTI compared with the point-to-point HVDC systems. It shows that MMC operating as static synchronous compensator (STATCOM) may further reduce the torsional damping at 6.3 Hz mode. This conclusion may be unexpected since it is known fact from literature that STATCOM has a beneficial impact on the transient performance of LCC. Further studies show that in a sequential HVDC loading, it may be beneficial to load the MMC HVDC first. Also, the risk of the SSTI may be minimized by changing HVDC controller gains, in particular, by increasing phaselocked-loop (PLL) gains on the LCC rectifier.

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Section: B Impact Of Hvdc Controller Gainssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Three-way Subsynchronous Torsional Interactions Between LCC HVDC, MMC HVDC and a Thermal Generator

Kovacevic,

Jovcic,

Rault

et al. 2023

Journal of Modern Power Systems and Clean Energy

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“…We connected an output filter capacitance C f = 275 µF between each pole of M1 and ground, and fault current limiter inductors L f = 200 mH at both ends of the HVDC link between M1 and M3. With such parameters 7 , from (4) we have…”

Section: Numerical Analysis Of the Detailed Systemmentioning

confidence: 99%

“…The current majority of the works in the literature considered and studied the effect of MMCs on the AC side system stability [5], [6]. An example of these undesirable convertergrid interactions was reported in [7]. The reason why the possible instability originated by effects on the DC side was not considered has to do with the seemingly reasonable belief that the dynamics of the HVDC link are irrelevant and thus can be ignored since electrical quantities are "constant" at the DC side of MMCs.…”

Section: Introductionmentioning

confidence: 99%

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Stability Analysis of MMC/MTDC Systems Considering DC-Link Dynamics

Giudice

Bizzarri

Linaro

et al. 2021

2021 IEEE International Symposium on Circuits and Systems (ISCAS)

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Modular multilevel converters (MMCs) are the basic building blocks of multi-terminal direct current systems (MTDCs). The current rapid growth of such systems makes it imperative to develop methods to analyse their DC-side stability, thereby ensuring a correct overall operation. In this paper, starting from a simplified MMC model, general conditions for DC-side stability are derived. These conditions have been validated by simulating a point-to-point high voltage direct current system and an MTDC network. MMC models of different degrees of accuracy have been adopted to show that the conditions derived in the paper hold with a good degree of approximation even when more detailed representations are considered.Index Terms-MMC, HVDC, MTDC, stability analysis.1 The MMC control sets its AC-side active and reactive power exchange.

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