Small-signal modeling of MMC based DC grid and analysis of the impact of DC reactors on the small-signal stability

Lu, Xiaojun; Lin, Weixing; Wen, Jinyu

doi:10.1016/j.ijepes.2018.01.046

Cited by 31 publications

(20 citation statements)

References 28 publications

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“…If we expand the expressions of the variables in (13) under the rotating xy frame, and retain only the DC components, we can get the dynamics of the DC total capacitor voltage. For HB-MMC, we have [19]:…”

Section: ) the Dc-side Equivalent Circuitmentioning

confidence: 99%

Comparative Study of Small-Signal Stability Under Weak AC System Integration for Different VSCs

Xiang

Lin

et al. 2021

IEEE J. Emerg. Sel. Topics Power Electron.

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Voltage source converters (VSCs) with self-commutation ability are suitable to interconnect weak AC systems. This paper conducts a comparative study of the small-signal stability characteristics for three typical VSCs, namely, the two-level VSCs (TL-VSCs), the half-bridge modular multilevel converters (HB-MMCs) and the hybrid MMCs (HY-MMCs), under weak AC system integration with special consideration on both inverter and rectifier operation. The frequency responses based on impedance models are compared using the frequency-domain analysis. The oscillation frequencies and mainly participated state variables of the unstable modes are compared using root locus and participation factor analysis in time-domain. Proper parameter retuning approaches for stability enhancement are proposed. The above analysis is adequately validated by electromagnetic simulations.

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Section: ) the Dc-side Equivalent Circuitmentioning

confidence: 99%

Comparative Study of Small-Signal Stability Under Weak AC System Integration for Different VSCs

Xiang

Lin

et al. 2021

IEEE J. Emerg. Sel. Topics Power Electron.

Self Cite

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“…As in Section II-C4, the effective DC bus capacitance C ef f is recalculated: substituting (22) into (8) and taking into account a perfect energy controller (i.e. assuming that v Σ Cz = v Σ * Cz ), it yields:…”

Section: Energy Management Control Variantsmentioning

confidence: 99%

“…In [6], the DC voltage droop control structure is redefined for dealing directly with the energy of the grid, with promising results. In [7] and [8], specific controllers are proposed to damp DC resonances. Even though some of these papers mention the MMC, the converters are modeled or controlled similarly as 2-level VSCs (as e.g.…”

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confidence: 99%

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Dynamic Analysis of MMC-Based MTDC Grids: Use of MMC Energy to Improve Voltage Behavior

Freytes¹,

Akkari

Rault

et al. 2019

IEEE Trans. Power Delivery

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This article deals with DC voltage dynamics of Multi-Terminal HVDC grids (MTDC) with energy-based controlled Modular Multilevel Converters (MMC) adopting the commonly used power-voltage droop control technique for power flow dispatch. Special focus is given on the energy management strategies of the MMCs and their ability to influence on the DC voltage dynamics. First, it is shown that decoupling the MMC energy from the DC side, causes large and undesired DC voltage transient after a sudden power flow change. This occurs when this energy is controlled to a fixed value regardless of the DC voltage level. Second, the Virtual Capacitor Control technique is implemented in order to improve the results. However, its limitations on droop-based MTDC grids are highlighted. Finally, a novel energy management approach is proposed to improve the performance of the later method. These studies are performed with detailed MMC models suitable for the use of linear analysis techniques. The derived MTDC models are validated against time-domain simulations using detailed EMT MMC models with 400 sub-modules per arm.

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“…Equations belonging to the system are determined by considering the input and output of the system; then the system's main data is found using these equations and the system's small signal stability can be examined [28].…”

Section: Linearization Model Of Equations In Small Signal Stability (mentioning

confidence: 99%

Small Signal Stability with the Householder Method in Power Systems

Sabati¹,

Bayındır

Padmanaban

et al. 2019

Energies

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Voltage collapse in power systems is still considered the greatest threat, especially for the transmission system. This is directly related to the quality of the power, which is characterized by the loss of a stable operating point and the deterioration of voltage levels in the electrical center of the region exposed to voltage collapse. Numerous solution methods have been investigated for this undesirable degradation. This paper focuses on the steady state/dynamic stability subcategory and techniques that can be used to analyze and control the dynamic stability of a power system, especially following a minor disturbance. In particular, the failure of one generator among the network with a large number of synchronous generators will affect other synchronous generators. This will become a major problem and it will be difficult to find or resolve the fault in the network due to there being too many variables, consequently affecting the stability of the entire system. Since the solution of large matrices can be completed more easily in this complex system using the Householder method, which is a small signal stability analysis method that is suggested in the thesis, the detection of error and troubleshooting can be performed in a shorter period of time. In this paper, examples of different rotor angle deviations of synchronous generators were made by simulating rotor angle stability deviations up to five degrees, allowing the system to operate stably, and concluding that the system remains constant.

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Small-signal modeling of MMC based DC grid and analysis of the impact of DC reactors on the small-signal stability

Cited by 31 publications

References 28 publications

Comparative Study of Small-Signal Stability Under Weak AC System Integration for Different VSCs

Comparative Study of Small-Signal Stability Under Weak AC System Integration for Different VSCs

Dynamic Analysis of MMC-Based MTDC Grids: Use of MMC Energy to Improve Voltage Behavior

Small Signal Stability with the Householder Method in Power Systems

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