Power system stability enhancement by WAMS-based supplementary control of multi-terminal HVDC networks

Machowski, J.; Kacejko, P.; Nogal, Łukasz; Wancerz, M.

doi:10.1016/j.conengprac.2012.11.010

Cited by 30 publications

(13 citation statements)

References 10 publications

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“…From Equations (7) and (9), it is obvious that U x can be determined by R and I d , and it is not related to the voltage level of the DC network. Figure 5 shows the relationship between I dm and U x according to the equations from Equations (7) to (10). At the point of I dm = 0, the curve is discontinuous, and U x changes from ÀRI d to RI d .…”

Section: Transmission Capacitymentioning

confidence: 99%

“…In order to make the stability of the AC/DC system enhanced after the conversion, the MTDC controllers should be equipped with supplementary controllers (or real power modulators) to make the real power dependent on power swings in the system. Literature proposed such a wide‐area measurement system based stabilizing control for MTDC systems and achieved satisfying results. In this paper, the system stability will not be investigated, but a new structure for converting AC lines to DC links is the focus of the paper.…”

Section: Introductionmentioning

confidence: 99%

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Modeling and control of extended multiterminal high voltage direct current systems with three-wire bipole structure

2014

Int. Trans. Electr. Energ. Syst.

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Summary In order to improve the transmission capability of power grids and mitigate the congestion of power flow, an idea on converting existing alternating current lines to an extended multiterminal high voltage direct current (MTDC) system is presented in this paper, and a three‐wire bipole structure (TWBS) suitable for MTDC systems is proposed. The topology of an extended MTDC system with the TWBS is described, and the operating principle of the TWBS and its transmission capability expansion mechanism are explained. The operating characteristic of the TWBS and its key equipment, the current regulation controller, are elaborated. The further application of the TWBS in DC grids is also proposed and analyzed in this paper. A test extended three‐terminal high voltage direct current system based on the TWBS is simulated with PSCAD/EMTDC. The simulation results verify the feasibility of the application of the TWBS in MTDC systems and demonstrate the effectiveness of the corresponding control strategies as well as the validity of the current regulation controller, with the full bridge modular multilevel converter. Copyright © 2014 John Wiley & Sons, Ltd.

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Section: Transmission Capacitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling and control of extended multiterminal high voltage direct current systems with three-wire bipole structure

2014

Int. Trans. Electr. Energ. Syst.

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“…Lyapunov's direct method plays a central role in the stability study of nonlinear control systems. This method is based on the existence of a scalar function of the states, that decreases monotonically along the trajectories to the stable equilibrium point and the challenge is to find a suitable Lyapunov function [17,18,19].…”

Section: Lyapunov Energy Functionmentioning

confidence: 99%

A critical evaluation of the application of HVDC supplementary control for system stability improvement

Alamuti

Rabbani

Kerahroudi

et al. 2014

2014 International Conference on Power System Technology

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Bulk power transfer requirements over long distances within a country or between neighboring countries as well as rapid increase in the number of offshore wind farms, have increased the application of high voltage DC links. Apart from the controllable power flow function of HVDC systems, advanced controllers can be employed to extend their functionality for dynamic and transient stability improvement of the underlying AC systems. This paper compares and critically evaluates HVDC supplementary controller strategies for improving AC system stability. A Preliminary explanation of the controller design process for each controller type as well as a brief comparison on their application to damp the inter-area oscillations have been presented in this paper.Index Terms-Power system stability, Supplementary Control, HVDC link.

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“…The CCT can be computed by iterative numerical solution of the systems' equations. Alternatively, the so-called Direct Methods, discussed in the classical literature of power systems [4][5][6][7], give the possibility to analytically approximate the region of attraction of a system. These methods are based on the use of the Transient Energy Functions (TEF), and they aim to provide information about the stability limits and margins in terms of energy.…”

Section: Introductionmentioning

confidence: 99%

Transient stability of power systems with embedded VSC‐HVDC links: stability margins analysis and control

Gonzalez‐Torres

Damm

Costan

et al. 2020

IET Generation, Transmission & Distribution

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This paper investigates the impact of embedded Voltage Source Converter-based High Voltage Direct Current (VSC-HVDC) links on AC grids transient stability. Firstly, using Transient Energy Functions (TEF), it is demonstrated that VSC-HVDC links controlled to track constant power references, do not inherently improve transient stability of the surrounding AC grid as an AC line naturally does. Then, a control law using the feedback linearization technique on a simple but representative power system is derived. The control law highlights and combines the three main actions the VSC-HVDC link can offer to enhance rotor angle stability: fast power reallocation, injection of synchronising power and injection of damping power. The control law is implemented and validated in EMT simulation. It is then shown that an HVDC link can assure the synchronisation of different AC areas even if no AC transmission lines interconnect them. Through another case study, it is shown how the HVDC link can help to share dynamic frequency reserves in order to not jeopardise the stability of the system. A last example investigates the effect of a DC fault on AC transient stability and how the control can help improving the system response.

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Power system stability enhancement by WAMS-based supplementary control of multi-terminal HVDC networks

Cited by 30 publications

References 10 publications

Modeling and control of extended multiterminal high voltage direct current systems with three-wire bipole structure

Modeling and control of extended multiterminal high voltage direct current systems with three-wire bipole structure

A critical evaluation of the application of HVDC supplementary control for system stability improvement

Transient stability of power systems with embedded VSC‐HVDC links: stability margins analysis and control

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