Analysis of Resonance Between a VSC-HVDC Converter and the AC Grid

Zou, Changyue; Rao, Hong; Xu, Shukai; Li, Yan; Li, Weiwei; Chen, Jun; Zhao, Xin; Yu, Yang; Lei, Bo

doi:10.1109/tpel.2018.2809705

Cited by 247 publications

(112 citation statements)

References 25 publications

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“…The three-phase voltages and currents can be given in the synchronous reference frame (dq-domain) by applying a unit vector rotating at the fundamental grid frequency, as defined in (3). Furthermore, Equation 2is linear and can be given in the frequency-domain as in (4).…”

Section: Grid Impedance Modelmentioning

confidence: 99%

“…Grid impedance is an important parameter in modern power systems, which may include a large number of power electronic converters [2]. The grid impedance has a significant effect on a power converter's dynamic performance, such as settling time, control bandwidth, and stability [3,4]. Grid impedance is known to slow down current control, which is an integral control function of the inverter as it is responsible for generating sinusoidal high-quality currents.…”

Section: Introductionmentioning

confidence: 99%

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Identification of Three-Phase Grid Impedance in the Presence of Parallel Converters

et al. 2019

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Grid impedance is an important parameter which affects the control performance of grid-connected power converters. Several methods already exist for optimizing the converter control system based on knowledge of grid impedance value. Grid impedance may change rapidly due to fault or disconnection of a transmission line. Therefore, online grid identification methods have been recently proposed to have up-to-date information about the grid impedance value. This is usually done by perturbing the converter output current and measuring the response in output voltage. However, any parallel converters connected to the same interface point will cause errors, since the measured current differs from the current that is flowing through the grid interface point. This paper points out challenges and errors in grid impedance identification, caused by parallel converters and their internal control functions, such as grid-voltage support. Experimental grid-impedance measurements are shown from the power hardware-in-the-loop setup developed at DNV-GL Flexible Power Grid Lab.

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Section: Grid Impedance Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Identification of Three-Phase Grid Impedance in the Presence of Parallel Converters

et al. 2019

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“…where D ω is a frequency droop, D dc is a droop coefficient for the dc-voltage that has been added to the original expression of p * ∆ in (7). Its main objective is to share information between terminals regarding mismatches inp * ∆1 andp * ∆2 .…”

Section: A Decentralised Virtual Frictionmentioning

confidence: 99%

“…The initial research efforts within this area were focused on Current Source Converters (CSC) HVDC links [3]. However, most recent research activities are focused on utilization of VSC-HVDC systems for improving the stability of power systems and for damping of power and frequency oscillations [7][8][9]. To mitigate the impact of the declining equivalent inertia of power systems, some authors have proposed specific control strategies that emulate the dynamic properties of synchronous generators [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Virtual Friction Control for Power System Oscillation Damping with VSC-HVDC Links

Rodríguez-Cabero

Roldán-Pérez

Prodanović

et al. 2019

2019 IEEE Energy Conversion Congress and Exposition (ECCE)

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This paper presents a technique for damping of oscillations in ac grids by control of VSC-HVDC links. The effect of the proposed controller is equivalent to a mechanical friction between two asynchronous networks (modelled as rotating masses) interconnected by the HVDC link. Therefore, the dynamics of the ac grids will be coupled, and the virtual friction gain can be utilised to effectively damp frequency oscillations in any of the ac networks. A centralised and a decentralised implementation of the proposed controller are presented. It is shown that both implementations of the virtual friction-based damping can effectively attenuate poorly damped frequency oscillations in both of the interconnected ac grids and that the decentralised implementation can ensure damping without relying on fast communication between the HVDC terminals. The impact of the proposed controller on the stability of the two grids is analysed with a simplified system model, and the performance is experimentally validated by a scaled laboratory setup.

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“…In [11], the resonance stability of different wind farms transmitted by the MMC-HVDC is studied. In [12,13], the oscillation problem in the asynchronous systems connected by MMC-HVDC is investigated. In these literatures, the frequency-domain impedance model is widely adopted to represent the MMC.…”

mentioning

confidence: 99%

Disturbance-State Modeling and Oscillation Analysis of Modular Multilevel Converters under P/Q Control Mode

Xing

Zhang

et al. 2020

Energies

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To investigate the oscillation problems in power systems with modular multilevel converters (MMCs), a disturbance-state model of the MMC under P/Q control mode is established based on the harmonic state-space (HSS) method. Firstly, the basic structure of the MMC with P/Q control is presented, including the circuit structure and the controller structure. Next, the dynamic characteristics of each module in the MMC are described with the time-domain state-space model or the s-domain transfer function. The complete controller structure is considered, including the P/Q outer-loop controller, the inner-loop control, the phase-locked loop (PLL), the circulating current suppression control (CCSC) and the control delay. On the basis, the disturbance-state HSS model of the MMC and its corresponding steady-state condition are established by the HSS method. Lastly, the case studies are performed to verify the accuracy of the proposed model, based on an MMC based test system in PSCAD/EMTDC. Moreover, one oscillation phenomenon in test system is illustrated by analyzing the AC-side impedance characteristics based on the proposed model. The results indicate that the MMC system under P/Q control mode has certain oscillation risk due to its negative resistance effect and the proposed model could be applied to its oscillation analysis.

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Analysis of Resonance Between a VSC-HVDC Converter and the AC Grid

Cited by 247 publications

References 25 publications

Identification of Three-Phase Grid Impedance in the Presence of Parallel Converters

Identification of Three-Phase Grid Impedance in the Presence of Parallel Converters

Virtual Friction Control for Power System Oscillation Damping with VSC-HVDC Links

Disturbance-State Modeling and Oscillation Analysis of Modular Multilevel Converters under P/Q Control Mode

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