Optimizing HVDC Grid Expansion and Control for Enhancing DC Stability

Elahidoost, Atousa; Furieri, Luca; Tedeschi, Elisabetta; Kamgarpour, Maryam

doi:10.23919/pscc.2018.8442753

Cited by 6 publications

(13 citation statements)

References 10 publications

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“…The small-signal stability constraint in (10) represents that all eigenvalues should have the negative real values. The linearized model of mixed AC/MTDC systems with the matrix component expressions in Refs.…”

Section: Inequality Constraintsmentioning

confidence: 99%

Transient Stability Constrained Optimal Power Flow in Mixed AC/Multi‐Terminal VSC HVDC System

Kim

Yokoyama

Takaguchi

et al. 2020

IEEJ Transactions Elec Engng

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This paper proposes a hierarchical transient stability constrained optimal power flow (TSCOPF) analysis in a power system with a multi‐terminal voltage‐source converter (VSC) high‐voltage direct current (HVDC) system and large‐scale wind farms. This aims at determining the reinforcement and operation of the power system using the multi‐terminal VSC HVDC (MTDC) system. By the method, the wind farms can be installed without any transient instability issues. On the AC grid side, transient rotor‐angle stability and transient AC voltage stability are included as additional constraints. On top of that, the constraints of DC bus voltage fluctuations and DC transmission line current deviations on the DC grid side are also taken into account. Time‐domain simulation approach is applied to investigate these transient stability constraints. The MTDC system reinforcement is designed considering wind power transmission and economic operation of the system model. The influences of the transient stability constraints on the system operation costs with high and low wind power output patterns are discussed. © 2020 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

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Section: Inequality Constraintsmentioning

confidence: 99%

Transient Stability Constrained Optimal Power Flow in Mixed AC/Multi‐Terminal VSC HVDC System

Kim

Yokoyama

Takaguchi

et al. 2020

IEEJ Transactions Elec Engng

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“…A simplified architecture of the 2-L VSC and the corresponding control are shown in Fig. 3 [17]. In order to apply the selected optimization methodology, the entire HVDC grid, consisting of converters with inner current controllers and cables, needs to be linearized around an equilibrium point and represented through the state-space equations (2) and (3).…”

Section: B Hvdc-vsc Based Grid Configuration and Modellingmentioning

confidence: 99%

“…Given the diverse nature of the scalar state variables in (4), we also model the initial state perturbations as separate ellipsoidal sets or intervals for different sets of state variables. For instance, we assume that Δid,n and Δiq,n belong to a different 2-dimensional ellipsoid for each n, while we assume that Δvdc,n belongs to an interval for each n. We consider a total of 15 separate ellipsoidal sets of perturbations for different initial state variables, which yields more realistic results than [17] and requires manipulation of the optimization problems involved.…”

Section: B Hvdc-vsc Based Grid Configuration and Modellingmentioning

confidence: 99%

“…An extension of the optimization method [18,19] aimed at decoupling the constraints on the control input signals of every converter station has been proposed in [17]. Here, we further extend the technique of [17] in order to address more realistic perturbations on the initial state variables as per Section II-B.…”

Section: Optimization Problem Derivationmentioning

confidence: 99%

“…In the case in which 1, , , i j n m i j the problem is equivalent to the one studied in [18,19]. For 1, j m the problem is equivalent to the one studied in [17]. Here, we address the general case where ni and mj are both integer values larger than 1.…”

Section: A) Problem Formulationmentioning

confidence: 99%

See 2 more Smart Citations

Reducing HVDC Network Oscillations Considering Wind Intermittency Through Optimized Grid Expansion Decision

Elahidoost

Furieri

Tedeschi

et al. 2018

2018 IEEE Energy Conversion Congress and Exposition (ECCE)

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This paper considers the evolution of independent offshore HVDC links into a multi-terminal network. It proposes a control strategy to maximize the DC voltage stability under the worst-case perturbation scenario and considers the intermittent nature of the power injection from connected wind farms. A decentralized linear feedback controller achieving the minimization of the DC voltage oscillations, while ensuring control input constraints (i.e. reference currents) compliance, is proposed. The motivation of this framework is to include the DC voltage stability maximization under the worst-case perturbation as an additional decision criterion in a multi-objective optimization for HVDC network expansion decision. The other criteria can include for instance, length or cost of a line or the power losses along the line. To evaluate the applicability of the proposed method, placement of a new HVDC link between two independent VSC-based point-to-point HVDC grids located in the North Sea is assessed, using real wind data for a 4-terminal test grid.

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A novel economic analysis on multiterminal VSC HVDC systems with wind farms by hierarchical small‐signal stability constrained OPF

Kim

Yokoyama

Takaguchi

et al. 2020

IEEJ Transactions Elec Engng

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In this paper, a novel economic analysis for multiterminal voltage‐source converter high‐voltage direct current (MTDC) systems with wind farms is developed. Both the reinforcement and operation methods of an MTDC system are determined hierarchically in the proposed approach. Based on these methods, not only wind power transmission but also the MTDC system is capable of contributing to the power transmission among alternating current (AC) grids in cases of low wind power production cases. As a consequence, the economic benefits produced by the MTDC system can be increased. This paper also focuses on the sensitivity analysis of small‐signal stability constraints on the developed approach. It is demonstrated that the system for wind power transmission without any MTDC systems is exposed to instability, which is solved by the proposed method. On top of that, the small‐signal stability improvement effect of the MTDC system is analyzed from the economic viewpoint. Under strict small‐signal stability constraints, the economic benefits obtained by the MTDC system increase. © 2020 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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Optimizing HVDC Grid Expansion and Control for Enhancing DC Stability

Cited by 6 publications

References 10 publications

Transient Stability Constrained Optimal Power Flow in Mixed AC/Multi‐Terminal VSC HVDC System

Transient Stability Constrained Optimal Power Flow in Mixed AC/Multi‐Terminal VSC HVDC System

Reducing HVDC Network Oscillations Considering Wind Intermittency Through Optimized Grid Expansion Decision

A novel economic analysis on multiterminal VSC HVDC systems with wind farms by hierarchical small‐signal stability constrained OPF

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