Analysis of control interactions in multi‐infeed VSC HVDC connections

Bayo-Salas, Alejandro; Beerten, Jef; Rimez, Johan; Hertem, Dirk Van

doi:10.1049/iet-gtd.2015.0876

Cited by 30 publications

(26 citation statements)

References 22 publications

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“…However, and even if studying harmonic emission levels is fundamental in order to ensure compliance with the grid code, the study of harmonic resonances and instabilities is gathering more attention in literature in recent years [20,24,25,26,27,28]. One of the main reasons for this trend is that sometimes, if an unexpected resonant point appears, a harmonic on that frequency can easily reach unacceptable amplitudes (e.g.…”

Section: A Harmonic Emission Vs Harmonic Resonance Vs Harmonic Instabilitymentioning

confidence: 99%

Introduction to the Analysis of Harmonics and Resonances in Large Offshore Wind Power Plants

Larumbe

Qin

Bauer

2018

2018 IEEE 18th International Power Electronics and Motion Control Conference (PEMC)

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The concern for power quality has been on the rise in recent years for all kinds of electric power systems. Harmonic analysis is especially interesting in the case of Offshore Wind Power Plants (OWPPs) due to the special susceptibility of these systems to harmonic issues and to the inherent differences in their behavior with respect to other electric networks. The aim of this article is to provide an overview of the basic concepts for harmonic analysis in OWPPs and to outline the typical assessment procedure used to this day. Some of the limitations of current industry practice will be outlined, as well as some possible complementary approaches for its improvement.

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Section: A Harmonic Emission Vs Harmonic Resonance Vs Harmonic Instabilitymentioning

confidence: 99%

Introduction to the Analysis of Harmonics and Resonances in Large Offshore Wind Power Plants

Larumbe

Qin

Bauer

2018

2018 IEEE 18th International Power Electronics and Motion Control Conference (PEMC)

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“…Hence, in a system with strong coupling among control variables, the design and tuning of a control loop needs to be conducted such that the overall stability margin of the entire system is maintained and an elevated level of interactions among control loops is avoided [16]. In fact, if the level of interactions among control loops is not considered during the design of a control loop, the attempts to obtain a locally optimal control loop with fast response and suppressed over/undershoot may force the entire system to operate in a high interaction conditions with reduced stability margin.…”

Section: Introductionmentioning

confidence: 99%

Interaction Assessment and Stability Analysis of the MMC-Based VSC-HVDC Link

et al. 2020

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This paper investigates the dynamic behavior of a modular multi-level converter (MMC)-based HVDC link. An overall state-space model is developed to identify the system critical modes, considering the dynamics of the master MMC and slave MMC, their control systems, and the HVDC cable. Complementary to the state-space model, an impedance-based model is also derived to obtain the minimum phase margin (PM) of the system. In addition, a relative gain array (RGA) analysis is conducted to quantify the level of interactions among the control systems of master and slave MMCs and their impacts on stability. Finally, with the help of the results obtained from the system analysis (eigenvalue, phase margin, sensitivity, and RGA), the system dynamic performance is improved.3 of 19 an eigenvalue and participation factors analysis in Section 6. Moreover, the system minimum PM is calculated through an impedance-based analysis using the Nyquist plot, and the level of interactions among control loops is studied using a frequency-dependent relative gain array (RGA) analysis. Finally, in Section 7, based on the results achieved from the system analyses, the stability of the system is improved by tuning the DC voltage control loop. System DescriptionA typical HVDC link between two AC networks is shown in Figure 1. In such configuration, the master MMC regulates DC voltage while the slave MMC controls active power exchange [27]. Either AC voltage or reactive power can be regulated at both ends. AC network 1 HVDC cable AC network 2 Master Slave V dc control P control

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“…Valuable work from the perspective of the study in this paper was presented in [9], in which the authors summarized the main factors affecting the small-signal stability of a VSC-based ac/dc power systems. Admittance-based stability assessment was performed in [10] to address control interactions and interferences between two grid-side VSC-HVDC converters, thereby proving the necessity of considering higherfrequency dynamics of VSCs, as well as of the connected ac network. The importance of addressing higher-frequency control interactions has recently been demonstrated in a number of research studies including VSC HVDC converters.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast to [7] and [8], in which the influence of outer control loops on the low-frequency electromechanical modes was examined, the study in this paper takes into account a wider frequency range. Differently from [10], small-signal properties are examined by modal and participation analysis in order to associate critical modes with corresponding state variables to gain better insights into the cause of possible instabilities.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis on Small-Signal Stability of Multi-Infeed VSC HVDC System With Different Reactive Power Control Strategies

2019

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Voltage Source Converter based High Voltage Direct Current (VSC HVDC) technology is used more and more in modern power systems. Consequently, in the ac network, an increasing number of converters are appearing in mutual electrical proximity, thus forming Multi-Infeed (MI)-HVDC systems. For VSC technology, several aspects of MI-HVDC system operation are less well understood compared to Line Commutated Converter (LCC) HVDC systems. This paper studies an MI system which consists of two VSC HVDC schemes based on Modular Multilevel Converters (MMC) interconnected with an ac line and connected to an external grid. The aim of the study is to identify the small-signal stability properties of such a system, thereby focusing on the impact of different outer control loops for reactive power and ac voltage regulation. INDEX TERMS Modular multilevel converters, multi-infeed HVDC, reactive power and voltage regulation, small-signal stability.

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Analysis of control interactions in multi‐infeed VSC HVDC connections

Cited by 30 publications

References 22 publications

Introduction to the Analysis of Harmonics and Resonances in Large Offshore Wind Power Plants

Introduction to the Analysis of Harmonics and Resonances in Large Offshore Wind Power Plants

Interaction Assessment and Stability Analysis of the MMC-Based VSC-HVDC Link

Comparative Analysis on Small-Signal Stability of Multi-Infeed VSC HVDC System With Different Reactive Power Control Strategies

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