A new HVDC grid test system for HVDC grid dynamics and protection studies in EMT-type software

Leterme, Willem; Ahmed, Noman; Beerten, Jef; Ängquist, Lennart; Hertem, Dirk Van; Norrga, Staffan

doi:10.1049/cp.2015.0068

Cited by 110 publications

(109 citation statements)

References 15 publications

Supporting

Mentioning

108

Contrasting

Unclassified

Order By: Relevance

“…The simulation is performed in Matlab/SIMULINK environment. The parameters, Table I, and the modelling approach are adopted from [9]. The dc voltage reference is set at v (8) and (9) and (9) directly.…”

Section: Simulation Resultsmentioning

confidence: 99%

Arm voltage estimation method for compensated modulation of modular multilevel converters

Taffese

Tedeschi

Jong

2017

2017 IEEE Manchester PowerTech

View full text Add to dashboard Cite

Abstract-The Modular Multilevel Converter (MMC), being a complex system, requires a number of controllers to function properly. These range from low level switching pattern generation to high level control loops. Among these controllers are modulation techniques that calculate the insertion indices, control inputs that decide the number of sub-modules inserted in a given arm. One such technique is compensated modulation which divides the reference voltages, generated by high level controllers, by the respective arm voltages (sum of capacitor voltages) when calculating the insertion indices. This prevents the arm voltage ripple from affecting the generated output voltage. For this purpose, the arm voltages can be measured (closedloop approach) or estimated (open-loop approach). This paper presents an arm voltage estimation technique for compensated modulation of MMCs. The proposed technique combines the benefits of the open-loop approach with that of the closed loop one.

show abstract

Section: Simulation Resultsmentioning

confidence: 99%

Arm voltage estimation method for compensated modulation of modular multilevel converters

Taffese

Tedeschi

Jong

2017

2017 IEEE Manchester PowerTech

View full text Add to dashboard Cite

show abstract

“…Figs. 2a-2b show the frequency dependency of r and l for a 320 kV XLPE cable for VSC HVDC transmission with data from [28]. Figs.…”

Section: Steady-state Cable Modelmentioning

confidence: 99%

Frequency‐dependent cable modelling for small‐signal stability analysis of VSC‐HVDC systems

Beerten

D’Arco

Suul

2016

IET Generation, Transmission & Distribution

107

View full text Add to dashboard Cite

State-of-the-art time-domain models of power cables account for the frequency dependency of physical parameters to enable accurate transient simulations of high voltage transmission schemes. Due to their formulation, these models cannot be directly converted into a state-space form as required for small-signal eigenvalue analysis. Thus, dc cables are commonly represented in HVDC power system stability studies by cascaded pi-section equivalents that neglect the frequency-dependent effects. This paper demonstrates how the conventional cascaded pi-section model is unable to accurately represent the damping characteristic of the cable and how this can lead to incorrect stability assessments. Furthermore, an alternative model consisting of cascaded pi-sections with multiple parallel branches is explored, which allows for a state-space representation while accounting for the frequency dependency of the cable parameters. The performance of the proposed model is benchmarked against state-of-the-art cable models both in the frequency domain and in the time domain. Finally, the paper provides a comparative example of the impact of the cable modelling on the small-signal dynamics of a point-to-point VSC HVDC transmission scheme.

show abstract

“…In this paper, the parameters for the cable geometry and materials are taken from [18]. The parameters in (11) are obtained via the PSCAD TM Line Constants Program [19].…”

Section: Cable Characteristic Impedancementioning

confidence: 99%

“…Main parameters of the converter model, taken from [22] are given in Table 1. The simulated impedance response are calculated using frequency sweeping on a continuous MMC model implemented in PSCAD TM [18]. Figure 2 shows that first, the operating point of the converter influences the converter impedance in the low frequency region.…”

Section: Equivalent Impedance Of MMC Convertersmentioning

confidence: 99%

See 1 more Smart Citation

Frequency domain based DC fault analysis for bipolar HVDC grids

Wang

Beerten

Hertem

2017

J. Mod. Power Syst. Clean Energy

View full text Add to dashboard Cite

This paper proposes a frequency domain based methodology to analyse the influence of High Voltage Direct Current (HVDC) configurations and system parameters on the travelling wave behaviour during a DC fault. The method allows us to gain deeper understanding of these influencing parameters. In the literature, the majority of DC protection algorithms essentially use the first travelling waves initiated by a DC fault for fault discrimination due to the stringent time constraint in DC grid protection. However, most protection algorithms up to now have been designed based on extensive time domain simulations using one specific test system. Therefore, general applicability or adaptability to different configurations and system changes is not by default ensured, and it is difficult to gain in-depth understanding of the influencing parameters through time domain simulations. In order to analyse the first travelling wave for meshed HVDC grids, voltage and current wave transfer functions with respect to the incident voltage wave are derived adopting Laplace domain based component models. The step responses obtained from the voltage transfer functions are validated by comparison against simulations using a detailed model implemented in PSCAD TM . Then, the influences of system parameters such as the number of parallel branches, HVDC grid configurations and groundings on the first travelling wave are investigated by analysing the voltage and current transfer functions.

show abstract

A new HVDC grid test system for HVDC grid dynamics and protection studies in EMT-type software

Cited by 110 publications

References 15 publications

Arm voltage estimation method for compensated modulation of modular multilevel converters

Arm voltage estimation method for compensated modulation of modular multilevel converters

Frequency‐dependent cable modelling for small‐signal stability analysis of VSC‐HVDC systems

Frequency domain based DC fault analysis for bipolar HVDC grids

Contact Info

Product

Resources

About