Small-signal modelling for in-depth modal analysis of an MTDC system

Akkari, Samy; Dai, Jing; Petit, Marc; Rault, Pierre; Guillaud, Xavier

doi:10.1109/epec.2015.7379955

Cited by 7 publications

(9 citation statements)

References 11 publications

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“…The DC-side of VSCs is represented by a core-screen coupled π model for a pair of DC cables [29,30] as shown in Figure 3. The inverter station is operated in constant DC voltage mode to allow the transmission of power from the rectifier station.…”

Section: Parallel Vsc Station Modelmentioning

confidence: 99%

Control of the Parallel Operation of VSC-HVDC Links Connected to an Offshore Wind Farm

Rodriguez-Amenedo

Arnaltes

Aragüés‐Peñalba³

et al. 2019

IEEE Trans. Power Delivery

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This paper introduces the control of the parallel operation of two VSC-HVDC links interconnecting an offshore wind farm. The aim of the study is to propose and validate a control system that allows the parallel operation of two VSC-HVDC links by controlling the currents injected by the VSC converters. The currents set points are established by a voltage controller in order to maintain constant voltage and frequency in the capacitor of the output filter and therefore within the offshore wind farm (OWF). It is demonstrated that the decoupled control of the d-q component of the voltage at the capacitor allows achieving the direct control of voltage and frequency, respectively. The voltage and frequency control (VFC) is implemented by orienting the capacitor voltage toward a synchronous axis that is generated within the controller and therefore is not subjected to any grid disturbance. Both converters collaborate therefore in maintaining constant voltage and frequency, achieving in this way the parallel operation of the converters. The validation of this approach is demonstrated by simulation where the OWF and the VSC-HVDC rectifier have been modeled. Simulation results demonstrate that the proposed control system allows the parallelization of the converters while maintaining constant voltage and frequency within the OWF, even during transient faults.

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Section: Parallel Vsc Station Modelmentioning

confidence: 99%

Control of the Parallel Operation of VSC-HVDC Links Connected to an Offshore Wind Farm

Rodriguez-Amenedo

Arnaltes

Aragüés‐Peñalba³

et al. 2019

IEEE Trans. Power Delivery

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show abstract

“…The modelling of the VSCs, the control of the converters including their inner and outer control loops, and the acquisition of their state-space representations is described in [13]. The overall control strategy of the VSCs is described in Figure 2 The MTDC system considered in this paper is a 3-terminal HVDC system [9], as depicted in Figure 3.…”

Section: B Mtdc System Modellingmentioning

confidence: 99%

“…The DC cable lengths are respectively 300 km between the GSC 1 and the WFC, and 200 km between the GSC 2 and the WFC. The procedure followed to obtain the state-space model of the system is described in [13].…”

Section: B Mtdc System Modellingmentioning

confidence: 99%

“…At high and very high frequencies, the four models are also equivalent: the MTDC system shows 3 succeeding resonance peaks corresponding to the coupling between the DC cables and the inner current loops of the converters [13], and then acts as a low-pass filter.…”

Section: Impact Of the Cable Model On The Frequency And Time Respomentioning

confidence: 99%

“…However, from a dynamic point of view, it appears that the use of a RC section results in a single resonance peak around 70 Hz related to the dominant DC voltage mode of the system [13]. Similarly, the frequency response corresponding to the classical PI section presents a strong resonance peak around 15 Hz that always prevents the system from satisfying the voltage constraint.…”

Section: Impact Of the Cable Model On The Frequency And Time Respomentioning

confidence: 99%

See 2 more Smart Citations

Impact of the DC cable models on the SVD analysis of a Multi-Terminal HVDC system

Akkari

Prieto‐Araujo

Dai

et al. 2016

2016 Power Systems Computation Conference (PSCC)

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Abstract-High Voltage Direct Current (HVDC) grids are complex Multi-Inputs Multi-Outputs (MIMO) systems whose dynamics are difficult to assess. This paper first describes the modelling of VSC-based Multi-Terminal HVDC systems (MTDC) using different existing cable models. It then recalls the benefits of the Singular Value Decomposition (SVD) approach for the frequency analysis of such systems, and describes how to perform an SVD analysis on a Multi-Terminal HVDC (MTDC) system from its state-space representation. The paper discusses the results of the SVD analysis with regards to the selection of the voltage-droop parameter and the DC voltage constraint of the DC grid. It then emphasises the impact of the choice of the DC cable model on the results of the SVD study and illustrates the cable model influence on the MTDC system through an ElectroMagnetic Transient (EMT) simulation.

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Interaction between the voltage‐droop and the frequency‐droop control for multi‐terminal HVDC systems

Akkari

Dai

Petit

et al. 2016

IET Generation, Transmission & Distribution

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MTDC systems need to provide a high level of reliability as well as efficient support to the interconnected AC grids. This can be achieved by equipping each converter with a dual controller combining both the voltage-droop and the frequency-droop control techniques. In this article, the theory behind the coupling between the two droops is investigated and an electromagnetic transient study of a 5-terminal HVDC grid is discussed to validate the theoretical results. The use of the dual controller allows the whole system to be more flexible. However, the frequency droop coefficient must be corrected to comply with the TSO's requirements.

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Small-signal modelling for in-depth modal analysis of an MTDC system

Cited by 7 publications

References 11 publications

Control of the Parallel Operation of VSC-HVDC Links Connected to an Offshore Wind Farm

Control of the Parallel Operation of VSC-HVDC Links Connected to an Offshore Wind Farm

Impact of the DC cable models on the SVD analysis of a Multi-Terminal HVDC system

Interaction between the voltage‐droop and the frequency‐droop control for multi‐terminal HVDC systems

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