Input-Admittance Calculation and Shaping for Controlled Voltage-Source Converters

Harnefors, Lennart; Bongiorno, Massimo; Lundberg, Stefan

doi:10.1109/tie.2007.904022

Cited by 901 publications

(708 citation statements)

References 14 publications

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“…Previous works have derived models of e.g. three-phase Voltage Source Converters (VSC) [1]- [4], Modular Multilevel Converters [5] [6] and single-phase VSCs [7]- [9]. Some examples of applications of impedancebased models for small signal stability analysis can be found in [10]- [16].…”

mentioning

confidence: 99%

On the Equivalence and Impact on Stability of Impedance Modeling of Power Electronic Converters in Different Domains

Rygg

Molinas

Zhang

et al. 2017

IEEE J. Emerg. Sel. Topics Power Electron.

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Abstract-Small-signal analysis of power electronic converters and systems is often carried out by impedance-based methods. At the core of these methods lies the impedance modelling, which can either be obtained through analytical calculations, simulations or measurements. The impedance models can be obtained into two main domains -the dq-domain and the sequence domain. In the dq-domain the impedance model is a 2x2 matrix, while in the sequence domain it is composed by the positive and negative sequence impedance. Recently, a third domain called the modified sequence domain was defined as an extension to the sequence domain, but also with clear similarities to the dq-domain. The objective of this paper is to unambiguously relate to each other the impedances in these three domains, and to show how this equivalence translates into their respective stability assessments. It is also proven that the sequence domain impedance has the same marginal stability condition as the dq-domain impedance matrix.The three-phase Voltage Source Converter is used as an example converter in this paper, as its impedance model in all three domains is well established and reported by previous research. The results in this paper shows that the modified sequence domain model can be derived from the dq-domain model (and vice versa), and that the stability analysis will be identical in these two domains. It is also shown how the original sequence domain model can be derived from the two other models through a model reduction. However, a small discrepancy between the two Nyquist plots is observed in the presence of components such as phase lock loop or DC-link control.

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mentioning

confidence: 99%

On the Equivalence and Impact on Stability of Impedance Modeling of Power Electronic Converters in Different Domains

Rygg

Molinas

Zhang

et al. 2017

IEEE J. Emerg. Sel. Topics Power Electron.

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“…[16,17], are described to be applied over the model of the set (3)e (11). First the models are obtained in the time domain.…”

Section: State Space Linearizationmentioning

confidence: 99%

“…And the impedance of the full converter is obtained by the equivalent parallel between DC capacitance and the impedance of the converter. The obtained impedance for this system is presented from (17) and (18), and the where K ptrans is the gain of the power from the abc to the dq reference frame, G a ¼ 1/V dc at the nominal value, the parameters a k are described in the Appendix A, Z C is the impedance of the DC capacitor.…”

Section: State Space Linearizationmentioning

confidence: 99%

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Stability evaluation of a DC micro-grid and future interconnection to an AC system

et al. 2014

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a b s t r a c tThis paper presents the stability analysis of a DC micro-grid fed by renewable sources and the future interconnection with an AC micro-grid. This interconnection is realized through a voltage source converter, and the operation of the micro-grid is in island mode. The stability is analyzed by the Nyquist criteria with the impedance relation method. The frequency response of the models was obtained by the injection of a perturbation current at the operation point. Where this perturbation was at the input of the converter used to export power from the DC grid. Other perturbation was applied at the node of the micro-grid to evaluate its impedance. Finally the simulations show the impedance representation of the systems, and the stability for the interconnection of them. The experimental verification shows the impedance of the converter with the same tendency as the representation obtained by the analytical and simulation.

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“…For the analysis of local interactions with the power system, the converter can usually be simplified as a controllable voltage source, whilst retaining a detailed representation of the converter controllers [4], [5]. Moreover, a reduced model of the AC system, namely a voltage source with a complex impedance based on the short-circuit ratio (SCR) at the Point of Common Coupling (PCC), is in general sufficient to study the stability of the controller [6], [7].…”

Section: Introductionmentioning

confidence: 99%

Identification and small-signal analysis of interaction modes in VSC MTDC systems

Beerten

D’Arco

Suul

2016

2016 IEEE Power and Energy Society General Meeting (PESGM)

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Abstract-In this paper, a methodology is presented to identify and analyse interaction modes between converters in Voltage Source Converter Multi-Terminal High Voltage Direct Current (VSC MTDC) systems. The absence of a substantial level of energy stored in such power electronics based systems results in fast system dynamics, governed by electromagnetic phenomena. Moreover, interactions between components are largely influenced by the control parameters and in general, an a-priori identification of interaction modes based on associated time constants is less straight-forward than in AC systems. Furthermore, the extent to which converters interact not only depends on the controller parameters, but is also influenced by the physical characteristics of the HVDC system. The methodology introduced in this paper is based on aggregated participation factors to distinguish between local modes, primarily associated with one terminal, and interaction modes involving multiple terminals. To illustrate the proposed methodology, the influence of droop control parameters, as well as DC breaker inductors, on the system dynamics and the participation of the terminals are investigated for a three-terminal MTDC system.

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Input-Admittance Calculation and Shaping for Controlled Voltage-Source Converters

Cited by 901 publications

References 14 publications

On the Equivalence and Impact on Stability of Impedance Modeling of Power Electronic Converters in Different Domains

On the Equivalence and Impact on Stability of Impedance Modeling of Power Electronic Converters in Different Domains

Stability evaluation of a DC micro-grid and future interconnection to an AC system

Identification and small-signal analysis of interaction modes in VSC MTDC systems

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