A Simple and Efficient AC-DC Load-Flow Method for Multiterminal DC Systems

Fudeh,; Ong,

doi:10.1109/mper.1981.5511894

Cited by 13 publications

(18 citation statements)

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“…J, (7,7) = J, ( J 5 matrix elements are the same as ordinary]acobian matrix elements.fs (7,7), except that: J 5 (7,7) = J; (7,7) + (2AI,2 -~:.2 )jA;; . .…”

Section: Rczmentioning

confidence: 99%

“…The solution of non-linear algebraic equations describing the AC-DC system can be obtained using Newton [I -3], Gauss-Seidel or other iterative techniques. There are several publications [4][5][6][7][8][9][10][11][12][13][14] which deal with the method of modelling the DC systems in the power-flow analysis. The approach to the solution of power-flow problem in AC-DC system is broadly divided into two categories: -sequential method, and -simultaneous method.…”

Section: Introductionmentioning

confidence: 99%

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Load flow based on Newton's method using norton equivalent circuit for AC‐DC multiterminal systems

Arifoğlu¹

1999

Int Trans Elec Energy Syst

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This paper presents the Newton-Raphson approach using new equations to the power-flow analysis in steadystatefor multiterminal DC-A C s.. 'stems. A flexible and practical choice ofper-unit system is used toformulate the DC network and conve rter equations. A converter is represented by Norton '.I' equations ofa current source in parallel with the commutation resistance. Unlike in previous literature, the DC network equations are used to derive the controller equations for the DC system using a subset of specifications. The specifications considered are power at (/11 terminals except the slack terminal where the DC voltage specified. Similar Newton '.I' approach uses six variables per converter but this approach uses three variables per converter. This property provides less storage requirement and computation time than the others. Unlike the proposed paper, in some papers based on Newton's method, the main problem is that some of the diagonal elements oflacobi an matrix are weak and zero, and partial pivoting in the solution by triangular reduction is essential.

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“…J, (7,7) = J, ( J 5 matrix elements are the same as ordinary]acobian matrix elements.fs (7,7), except that: J 5 (7,7) = J; (7,7) + (2AI,2 -~:.2 )jA;; . .…”

Section: Rczmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Load flow based on Newton's method using norton equivalent circuit for AC‐DC multiterminal systems

Arifoğlu¹

1999

Int Trans Elec Energy Syst

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“…Considering that the nth bus is the bus with the reference converter and suppressing the nodes of buses without converters, the following set of equations [3] is obtained:…”

Section: Principal Equations DC Converter Modelmentioning

confidence: 99%

A Multiterminal HVDC Load-Flow with Flexible Control Specifications

Mahseredjian

Mukhedkar

Lefebvre

1986

IEEE Trans. Power Delivery

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This paper presents a sequential ac-dc load-flow method for parallel multiterminal dc networks. P.u.-expressed dc equations are treated separately from ac equations and an interface is used to check and adjust their mutual convergence. A dc converter acts like a load on its ac bus; when it is a rectifier P and Q powers are consumed, and when it is an inverter Q is consumed and P is a negative load, or a generation. This method distinguishes itself by its ability to handle a large variety of converter controls, by its capability to modify established controls to respect angle, transformer tap, voltage and current limits at the converters. The interface between the ac and dc equations is designed to increase ac-dc convergence possibilities. Standard characteristics such as fixed tap and discrete tap-steps at the converter transformer are also handled.Numerical examples which demonstrate several features of the described method are presented.

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“…Substantial studies related to combined AC-DC system performance evaluation using numerical optimization methods have been reported in the literature, notably for load flow and stability analysis. [9][10][11][12][13][14][15][16][17] With regard to the OPF problem of hybrid AC-DC systems (termed AC-DC OPF), there is a very limited number of research work devoted to this topic. In earlier works, some conventional methods were suggested for solving such optimization problem.…”

Section: Introductionmentioning

confidence: 99%

Optimal power flow solution of integrated AC-DC power system using enhanced differential evolution algorithm

Sayah

Hamouda

2018

Int Trans Electr Energ Syst

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Summary High voltage direct current (HVDC) transmission systems are essential elements in modern electrical power grids due to their economic and technical advantages. In order to incorporate HVDC links, the basic optimal power flow (OPF) procedure requires substantial modifications to be able to model the practical operating state of both AC and DC systems. The existence of a DC link introduces complexity in OPF computation. Therefore, we propose in this paper an efficient enhanced differential evolution algorithm with new mutation scheme, called differential evolution with local search mutation, to solve OPF problem incorporating HVDC links. The proposed technique adjusts available AC and DC control variables in order to minimize the total operating cost under both AC and DC operational constraints. The performance of the proposed strategy has been illustrated using four different test systems of various sizes. The achieved results were evaluated and compared with those reported recently in literature.

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A Simple and Efficient AC-DC Load-Flow Method for Multiterminal DC Systems

Cited by 13 publications

References 0 publications

Load flow based on Newton's method using norton equivalent circuit for AC‐DC multiterminal systems

Load flow based on Newton's method using norton equivalent circuit for AC‐DC multiterminal systems

A Multiterminal HVDC Load-Flow with Flexible Control Specifications

Optimal power flow solution of integrated AC-DC power system using enhanced differential evolution algorithm

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