A Hierarchical Small-Signal Controller Stability Analysis Method for the MMCs

Ji, Ke; Pang, Hui; Li, Yunfeng; He, Zhiyuan; Huang, Pengxiang; Chen, Changsheng; Tang, Guangfu

doi:10.1109/tpwrd.2021.3112382

Cited by 15 publications

(6 citation statements)

References 33 publications

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“…The graph partitioning method used in this paper is based on the minimum cut -maximum flow theorem [12]. The minimum cut between two graph nodes separating a graph into two parts corresponds to the maximum flow between those nodes 1 .…”

Section: Graph Partitioning Methodsmentioning

confidence: 99%

On the Partitioning of MMC Control Systems Using Graph Theory

Jahn

Chaffey

Prieto‐Araujo³

et al. 2022

IEEE Open J. Power Electron.

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Control systems of modular multilevel converters can be partitioned into several levels. Such partitioning is becoming relevant in multi-vendor high-voltage direct-current systems where one party may deliver the converter hardware and associated control, whereas another party may deliver the systemrelated control. However, the exact control system partitioning has not been subject to research. This paper presents a method for partitioning control systems into two levels with minimum dependencies between the two levels. Furthermore, the impact of specific control designs on the partitioning and integration effort is discussed using an example. The presented method is useful for the design of multi-vendor control systems for modular multilevel converters whose partitioning otherwise would be based on engineering intuition.

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Section: Graph Partitioning Methodsmentioning

confidence: 99%

On the Partitioning of MMC Control Systems Using Graph Theory

Jahn

Chaffey

Prieto‐Araujo³

et al. 2022

IEEE Open J. Power Electron.

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“…The proportional integral (PI) controller for CCSC should first be tuned to ensure the inner stability of MMC [33], [34]. Harmonic transfer functions can then be used to tune the PI parameters for CCSC.…”

Section: B Small-signal Modeling Under Ac-side Perturbationmentioning

confidence: 99%

Stability Comparison Between Grid-forming and Grid-following Based Wind Farms Integrated MMC-HVDC

Pan¹,

Liu²,

Liu³

et al. 2023

Journal of Modern Power Systems and Clean Energy

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Grid-forming (GFM) control based high-voltage DC (HVDC) systems and renewable energy sources (RESs) provide support for enhancing the stability of power systems. However, the interaction and coordination of frequency support between the GFM-based modular multilevel converter based HVDC (MMC-HVDC) and grid-following (GFL) based RESs or GFM-based RESs have not been fully investigated, which are examined in this study. First, the detailed AC-and DC-side impedances of GFM-based MMC-HVDC are analyzed. The impedance characteristics of GFL-and GFM-based wind turbines are next analyzed. Then, the influences of GFL-and GFM-based wind farms (WFs) on the DC-and AC-side stabilities of WF-integrated MMC-HVDC systems are compared and evaluated. The results show that the GFM-based wind turbine performs better than the GFL-based wind turbine. Accordingly, to support a receiving-end AC system, the corresponding frequency supporting strategies are proposed based on the GFM control for WF-integrated MMC-HVDC systems. The GFM-based WF outperforms the GFL-based WF in terms of stability and response time. Simulations in PSCAD/EMTDC demonstrate the DC-and AC-side stability issues and seamless grid support from the RESs, i.e., WFs, to the receiving-end AC system.

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“…Methodologies to identify and mitigate control interactions have been developed and investigated in the literature [18], [30], [34]. Analyzing the stability of internal converter control loops in the control design stage serves a useful purpose as it attempts to ensure that harmonic instabilities do not occur due to incorrect tuning of the inner control loops [35], [36]. Nevertheless, harmonic stability can mainly be evaluated analytically if full knowledge of the control system is rendered.…”

Section: Control System Partitioningmentioning

confidence: 99%

“…Analysis of the effects of different control loops on converter stability and impedance is a prerequisite to partition the control system. Several papers have analyzed the impact of different control schemes on the impedance of the MMC [14], [17], [30], [35], [37]. In [37], it is shown that the impact of inner current control loops on the dc-side impedance of an MMC is minimal compared to that of the outer loops.…”

Section: Control System Partitioningmentioning

confidence: 99%

“…The circulating currents have a dominant negative sequence double line frequency component. We define g = cos(−2 θ) and h = sin(−2 θ) , (35) used in Park transformation of the circulating currents. The responses of the circulating currents in the synchronous reference frame to the applied dc-side perturbation is also calculated similarly as…”

Section: B Response Of the Converter Variablesmentioning

confidence: 99%

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