Modeling and Analysis of VSC-Based HVDC Systems for DC Network Stability Studies

Pinares, Gustavo; Bongiorno, Massimo

doi:10.1109/tpwrd.2015.2455236

Cited by 143 publications

(61 citation statements)

References 14 publications

(23 reference statements)

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“…Figure 5 shows a comparison between the conventional and proposed DC-line models. In [31], the DC line of the HVDC system was modeled using a π-section. The accuracy of the estimation increases with the number of π-sections used, as discussed in Section 4.…”

Section: Dc-line Modelingmentioning

confidence: 99%

Modeling of HVDC System to Improve Estimation of Transient DC Current and Voltages for AC Line-to-Ground Fault—An Actual Case Study in Korea

et al. 2017

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Abstract:A new modeling method for high voltage direct current (HVDC) systems and associated controllers is presented for the power system simulator for engineering (PSS/E) simulation environment. The aim is to improve the estimation of the transient DC voltage and current in the event of an AC line-to-ground fault. The proposed method consists primary of three interconnected modules for (a) equation conversion; (b) control-mode selection; and (c) DC-line modeling. Simulation case studies were carried out using PSS/E and a power systems computer aided design/electromagnetic transients including DC (PSCAD/EMTDC) model of the Jeju-Haenam HVDC system in Korea. The simulation results are compared with actual operational data and the PSCAD/EMTDC simulation results for an HVDC system during single-phase and three-phase line-to-ground faults, respectively. These comparisons show that the proposed PSS/E modeling method results in the improved estimation of the dynamic variation in the DC voltage and current in the event of an AC network fault, with significant gains in computational efficiency, making it suitable for real-time analysis of HVDC systems.

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Section: Dc-line Modelingmentioning

confidence: 99%

Modeling of HVDC System to Improve Estimation of Transient DC Current and Voltages for AC Line-to-Ground Fault—An Actual Case Study in Korea

et al. 2017

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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%

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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“…The impedance stability criterion was proposed in [14] and used in grid-connected inverters [15]. It was applied as a stability criterion in a VSC-HVDC system [12,[16][17][18][19]]. The impedance model of two-terminal VSC-HVDCs was built in [12], and the cause of DC current resonance was analyzed with Nyquist stability criteria.…”

Section: Introductionmentioning

confidence: 99%

“…The impedance model of two-terminal VSC-HVDCs was built in [12], and the cause of DC current resonance was analyzed with Nyquist stability criteria. Different subsystems were selected to analyze the DC-side stability of the VSC-HVDC system with a transfer function method in [16]. The influence of overhead transmission lines, DC cables, and the DC-side filter on system stability was investigated in [17].…”

Section: Introductionmentioning

confidence: 99%

A Virtual Impedance Control Strategy for Improving the Stability and Dynamic Performance of VSC–HVDC Operation in Bidirectional Power Flow Mode

Liu

Liao

et al. 2019

Applied Sciences

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It is a common practice that one converter controls DC voltage and the other controls power in two-terminal voltage source converter (VSC)-based high voltage DC (HVDC) systems for AC gird interconnection. The maximum transmission power from a DC-voltage-controlled converter to a power-controlled converter is less than that of the opposite transmission direction. In order to increase the transmission power from a DC-voltage-controlled converter to a power-controlled converter, an improved virtual impedance control strategy is proposed in this paper. Based on the proposed control strategy, the DC impedance model of the VSC-HVDC system is built, including the output impedance of two converters and DC cable impedance. The stability of the system with an improved virtual impedance control is analyzed in Nyquist stability criterion. The proposed control strategy can improve the transmission capacity of the system by changing the DC output impedance of the DC voltage-controlled converter. The effectiveness of the proposed control strategy is verified by simulation. The simulation results show that the proposed control strategy has better dynamic performance than traditional control strategies.

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Modeling and Analysis of VSC-Based HVDC Systems for DC Network Stability Studies

Cited by 143 publications

References 14 publications

Modeling of HVDC System to Improve Estimation of Transient DC Current and Voltages for AC Line-to-Ground Fault—An Actual Case Study in Korea

Modeling of HVDC System to Improve Estimation of Transient DC Current and Voltages for AC Line-to-Ground Fault—An Actual Case Study in Korea

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

A Virtual Impedance Control Strategy for Improving the Stability and Dynamic Performance of VSC–HVDC Operation in Bidirectional Power Flow Mode

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