A new approach to AC-DC load flow analysis

El‐Hawary, Mohamed E.; Ibrahim, S.T.

doi:10.1016/0378-7796(95)00945-e

Cited by 30 publications

(14 citation statements)

References 10 publications

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“…respectively. The number of bridges 'n b ' for all the converters [11] was taken to be equal to 2. To minimize the reactive power requirement at the rectifier and inverter terminals and the overall system losses, the values of the rectifier firing angles and the inverter extinction angles are kept within 5-7°and 15-22°respectively, for all the case studies.…”

Section: Case Studies and Resultsmentioning

confidence: 99%

“…It is observed that each control strategy affects the sequential power flow convergence in a uniquely different manner. It was reported by [11] that for standard control strategies e.g. constant DC voltage or current or power, the convergence rate can be improved by decoupling the DC and AC systems and solving them independently.…”

Section: Introductionmentioning

confidence: 99%

“…These are known as the unified and the sequential method, respectively. Some excellent research works on the unified and the sequential power flow methods are presented in [4][5][6][7][8][9][10][11][12][13][14][15], respectively. Unlike the unified method, the sequential method is easier to implement and poses lesser computational burden due to the smaller size of the Jacobian matrix.…”

Section: Introductionmentioning

confidence: 99%

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Impact of DC link control strategies on the power-flow convergence of integrated AC–DC systems

Khan

Bhowmick

2016

Ain Shams Engineering Journal

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For the power-flow solution of integrated AC-DC systems, five quantities are required to be solved per converter, against three independent equations available. These three equations consist of two basic converter equations and one DC network equation, corresponding to each converter. Thus, for solution, two additional equations are required. These two equations are derived from the control specifications adopted for the DC link. Depending on the application, several combinations of valid control specifications are possible. A set of valid control specifications constitutes a control strategy. It is observed that the control strategy adopted for the DC link strongly affects the power-flow convergence of integrated AC-DC systems. This paper investigates how different control strategies affect the power flow convergence of integrated AC-DC systems. Sequential method is used to solve the DC variables in the Newton Raphson (NR) power flow model. Seven typical control strategies have been taken into consideration. This is validated by numerous case studies carried out with multiple DC links incorporated in the IEEE 118-bus and 300-bus test systems. Ó 2015 Faculty of Engineering, Ain Shams University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Section: Case Studies and Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of DC link control strategies on the power-flow convergence of integrated AC–DC systems

Khan

Bhowmick

2016

Ain Shams Engineering Journal

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“…A quite a number of publications are devoted to several subject of MTDC involving since the classical steady state performance [4][5][6][7][8], classical and security constrained optimal power flow [7,[9][10][11], modelling [12][13][14], control and protection [15][16][17][18][19][20], and simulation of dynamic behaviour [4,[21][22][23][24]. An aspect that requires evaluation, the traditional reliability and availability related to outages as to transient reliability related to performance during and recovery after temporary faults and disturbances.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Behaviour of Multi-Terminal VSC-Based HVDC after a Converter Outage: DC Control Strategy

González-Longatt¹,

Arnaltes

Rodriguez-Amenedo

2016

REPQJ

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Abstract.The aim of this paper is to evaluate the effect of DC-voltage control strategy on dynamic behaviour of multi-terminal VoltageSource Converter (VSC)-Based HVDC after a converter outage. In this paper, two dc voltage control strategies are considered: (i) standard voltage margin method (SVMM) and (ii) standard voltage-droop method (SVDM). The impact is evaluated in this paper using time-domain simulations on simple test system using DIgSILENT ® PowerFactory TM considering a sudden disconnection of a converter-station. Simulation results demonstrate how important is the dc-voltage control strategy and the location/number of dc-buses involved in the dc-voltage on the dynamic response of the MTDC systems. The voltage margin control is capable to survive a converter outage just if this converter is operating on constant power mode.

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“…The sequential method was proposed by Reeve et al [16]. It solves the DC system equations using interface variables as computed from AC power flow [17], [18]. Sequential approach is quite easy to develop and be integrated into an existing AC based power flow software while for the unified approach a whole implementation is needed.…”

Section: Introductionmentioning

confidence: 99%

Power Flow Solution on Multi-Terminal HVDC Systems: Supergrid Case

González-Longatt¹,

Roldan²,

Charalambous³

2012

REPQJ

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Abstract. High Voltage Direct Current (HVDC) systemsoffer distinct advantages for the integration of offshore wind farms to inland grid system. HVDC transmission system based on Voltage Source Converter (VSC) enables multi-terminal use HVDC for the integration of large-scale wind power in the North Sea. That network requires a special formulation for power flow analysis as opposed to the conventional method employed on AC networks. This paper presents a sequential AC/DC power flow algorithm, which is proposed for the analysis of multi-terminal VSC HVDC (VSC-MTDC) systems. This sequential power flow method can be implemented easily in an existing AC power flow package and is very flexible when compared with unified methods. Gauss-Siedel is used to solve DC power balance equations, as it offers two keys advantages: very fast and simple computational implementation, and errors do not accumulate during the calculation. The algorithm is tested using the WSCC 3-machine, 9-bus system with a 3-terminal MTDC network and the results are compared with those obtained from DIgSILENT  PowerFactoryTM demonstrating the validity of the proposed algorithm. As an aggregate value, a representative test case of the projected scheme for the phase I of the Supergrid project on the North Sea is presented. The proposed approach presented in this paper is used to calculate DC power flows for some scenarios.

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A new approach to AC-DC load flow analysis

Cited by 30 publications

References 10 publications

Impact of DC link control strategies on the power-flow convergence of integrated AC–DC systems

Impact of DC link control strategies on the power-flow convergence of integrated AC–DC systems

Dynamic Behaviour of Multi-Terminal VSC-Based HVDC after a Converter Outage: DC Control Strategy

Power Flow Solution on Multi-Terminal HVDC Systems: Supergrid Case

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