Optimal power flow for combined AC and multi-terminal HVDC grids based on VSC converters

Wiget, Roger; Andersson, Göran

doi:10.1109/pesgm.2012.6345448

Cited by 81 publications

(49 citation statements)

References 13 publications

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“…Though a HVDC grid has many advantages, there are challenges that HVDC grid researchers need to face and deal with, such as how to control power flow and direct voltage and how to achieve fast control and protections. Currently, the researchers around world are undertaking HVDC grids related R&D work with their own models which are of different configurations and data [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

HVDC grid test models for different application scenarios and load flow studies

Han

et al. 2016

J. Mod. Power Syst. Clean Energy

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High Voltage Direct Current (HVDC) grids are the most effective solutions for collection, integration and transmission of large scale remote renewable resources to load centers. A HVDC grid test model can provide a common reference and study platform for researchers to compare the performance and characteristics of a DC grid with different DC control functions and protection strategies. It can also provide reference cases for testing of simulators and digital programs. This paper proposes a comprehensive HVDC grid test model and the associated four sub test models for system studies to meet the research purposes and requirements for different DC grid application scenarios. The design concept, topologies, configurations and functions of the test models are described in detail and their basic system data for load flow studies are provided. Finally load flow simulation studies with PSS/E (Power System Simulator/Engineering) program for each of the models are undertaken and the corresponding results are presented and analyzed in the paper.

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Section: Introductionmentioning

confidence: 99%

HVDC grid test models for different application scenarios and load flow studies

Han

et al. 2016

J. Mod. Power Syst. Clean Energy

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“…Nowadays, direct current networks are present in microgrids and smart grids, in electronic power distribution systems and in supergrids dedicated to integrating continental renewable resources [2][3][4]. Therefore, several studies have proposed tools to achieve optimal power flow (OPF) in combined ac-dc networks [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Optimal Operation of DC Networks to Support Power System Outage Management

Pinto

Aragüés‐Peñalba

Gomis‐Bellmunt

et al. 2016

IEEE Trans. Smart Grid

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Abstract-The penetration of dc networks for different applications in power systems is increasing. This paper presents a novel methodology for security-constrained optimal power flow (SCOPF) operation of a power system, such as a smart grid or a supergrid, with an embedded dc network. The methodology demonstrates that dc networks can be operated to provide support to ac systems, increasing its security of supply and resilience in case of outages, while reducing operational costs. Moreover, the outage management support can be achieved via a preventive SCOPF -i.e. the combined network stays N-1 secure after outages without need for further control action -or via a corrective SCOPF, by using the fast controls of the ac-dc converters to react to the contingencies. The methodology relies on the construction of a binary outage matrix and optimizes only the control variables of the ac and dc networks. It was successfully tested in system with 12 buses and in the IEEE30 network with 35 buses. Operational savings of up to 1% and 0.52% were obtained for the first and second networks, respectively, while network violations for the N-1 contingency scenarios were completely eliminated in the first and reduced by 70% in the former.

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“…In [12], an algorithm for solving power flows in AC/DC networks is presented and implemented in MATPOWER R , taking into account converter losses through a generalized converter loss model proposed in [13]. Some papers analyse the optimal operation of hybrid AC/DC systems, [14][15][16][17][18]. In [14], some power system elements are represented with limited accuracy: terminal VSC losses are neglected and only point-to-point connections are defined.…”

Section: Introductionmentioning

confidence: 99%

“…In [14], some power system elements are represented with limited accuracy: terminal VSC losses are neglected and only point-to-point connections are defined. Converter losses are included in [15][16][17][18]. [15] focuses on the mathematical formulation of the problem.…”

Section: Introductionmentioning

confidence: 99%

“…But it is worth mentioning that [16] includes additional constraints reflecting grid code requirements, neglected in other studies. The authors' analysis from [17,18] cover different optimization goals. Among all, the tool presented in [18] is the first one that defines and optimizes, for different objective functions, DC and AC load flows simultaneously in a random AC-DC network, allowing the possibility of meshing the DC system.…”

Section: Introductionmentioning

confidence: 99%

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Optimal power flow tool for hybrid AC/DC systems

Aragüés‐Peñalba¹,

Beerten²,

Rimez³

et al. 2015

11th IET International Conference on AC and DC Power Transmission

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This study presents a tool for solving the Optimal Power Flow (OPF) problem in mixed Direct Current (DC) and Alternating Current (AC) systems. It allows to analyse the optimal operation of multiple independent systems, DC connected and linked to the AC system, from a steady state point of view and for several objective functions. The tool, implemented through implemented through MATLAB R Optimization toolbox is benchmarked with another OPF tool, implemented in MATPOWER R . Both tools lead to the same results for the system analysed when minimising losses and one minimising the deviation from a preset voltage profile. A sensitivity analysis is performed to assess the influence of DC and AC grid parameters on the operation of the system.

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Optimal power flow for combined AC and multi-terminal HVDC grids based on VSC converters

Cited by 81 publications

References 13 publications

HVDC grid test models for different application scenarios and load flow studies

HVDC grid test models for different application scenarios and load flow studies

Optimal Operation of DC Networks to Support Power System Outage Management

Optimal power flow tool for hybrid AC/DC systems

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