Simulation Framework for DC Grid Control and ACDC Interaction Studies Based on Modular Multilevel Converters

Wenig, Simon; Rojas, Freiber; Schönleber, Kevin; Suriyah, Michael; Leibfried, Thomas

doi:10.1109/tpwrd.2015.2417681

Cited by 44 publications

(14 citation statements)

References 26 publications

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“…Although in (14), further decoupling of the control matrix is possible in ac-side quantities, for the purpose of our studies, the decoupling of the ac-and dc-side control is sufficient. * If a dc-side inductance and resistance R dc and L dc are present, this entry becomes (R eq arm +R dc ) /(L eq arm +L dc ) (e.g., see also [45].) † If a dc-side inductance L dc is present, this entry becomes 1 /(L eq arm +L dc ).…”

Section: ) Simulation Model and Parametersmentioning

confidence: 99%

Modeling of MMCs With Controlled DC-Side Fault-Blocking Capability for DC Protection Studies

Leterme

Judge

Wylie³

et al. 2020

IEEE Trans. Power Electron.

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The fault current characteristics in dc systems depend largely on the response, and hence also the topology, of the ac-dc converters. The presently used ac-dc converter topologies may be categorized into those with controlled or uncontrolled fault blocking capability and those lacking such capability. For the topologies of the former category, generic models of the dc-side fault response have not yet been developed and a characterization of the influence of control and sensor delays is a notable omission. Therefore, to support accurate and comprehensive dc system protection studies, this paper presents three reduced converter models and analyzes the impact of key parameters on the dc-side fault response. The models retain accurate representation of the dc-side current control, but differ in representation of the ac-side and internal current control dynamics, and arm voltage limits. The models were verified against a detailed (full-switched) simulation model for the cases of a full-bridge and a hybrid modular multilevel converter, and validated against experimental data from a lab-scale prototype. The models behave similarly in the absence of arm voltage limits, but only the most detailed of the three retains a high degree of accuracy when these limits are reached.

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Section: ) Simulation Model and Parametersmentioning

confidence: 99%

Modeling of MMCs With Controlled DC-Side Fault-Blocking Capability for DC Protection Studies

Leterme

Judge

Wylie³

et al. 2020

IEEE Trans. Power Electron.

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“…High-voltage DC voltage-source converter (VSC-HVDC) transmission with modular multi-level converters (MMCs) has been established as the state-of-the-art technology for such connections. It offers low transmission losses, small filter requirements resulting in less foot-print, black-start capability of the offshore grid and less raw material for the cables compared to AC [3]. In the future, interconnection between several HVDC connections might evolve into a meshed HVDC grid to integrate flawlessly offshore wind into the European grids [4,5,6].…”

Section: Introductionmentioning

confidence: 99%

Handling of unbalanced faults in HVDC-connected wind power plants

Schönleber

Prieto‐Araujo

Ratés-Palau

et al. 2017

Electric Power Systems Research

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“…Generally, commonly used methods for modelling MMCs could be sorted as surrogate network method, [3][4][5] state-space method, [6][7][8] Thévenin equivalent method using 2-state resistance switch model, 9,10 averaged model, [11][12][13] and hybrid-system model. 14,15 These methods could meet various requirements for simulation effectively.…”

Section: Introductionmentioning

confidence: 99%

A fixed topology Thévenin equivalent integral model for modular multilevel converters

Zhang

Yang

Huang

et al. 2017

Int Trans Electr Energ Syst

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Summary The Thévenin equivalent model for half‐bridge modular multilevel converters on electromagnetic transient simulation, applying 2‐state resistances to represent switches and adopting Dommel's algorithm to get a discretized capacitance in each submodule, achieves good central processing unit time saving while maintaining the identity of every submodule. But the large number of changeable resistances still brings a computational challenge for simulation efficiency, because the admittance matrix gets an equaled size to the amount of nodes, and inverts (re‐triangularizes) each time when a switch performs. This paper presents a novel fixed topology Thévenin equivalent half‐bridge modular multilevel converter integral model and simplifies its mathematical expression markedly. The choice of integration methods is also performed by discussion of the stability, and backward Euler algorithm is selected for further speedup. Basically, it achieves speedup by (1) the use of novel Thévenin equivalent model to achieve unchangeable admittance matrix while regarding the switches as excitations; (2) merging the elements (inductances, resistances, and submodules) in the arm of modular multilevel converter by Thévenin equivalent to reduce the order of admittance matrix; (3) simplifying the mathematica expression of sub module by Thévenin equivalent and omitting the small resistance; and (4) the use of backward Euler algorithm to discretize all the elements (capacitances, inductances, resistances, and submodules) in the circuit for a better convergence speed and larger speedup factor. The model is implemented in a 3‐phase grid‐connected modular multilevel converter circuit; the results show that the proposed Thévenin equivalent integral model makes a good accuracy on simulating the performances of the half‐bridge modular multilevel converter with drastically reduced computational time.

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Simulation Framework for DC Grid Control and ACDC Interaction Studies Based on Modular Multilevel Converters

Cited by 44 publications

References 26 publications

Modeling of MMCs With Controlled DC-Side Fault-Blocking Capability for DC Protection Studies

Modeling of MMCs With Controlled DC-Side Fault-Blocking Capability for DC Protection Studies

Handling of unbalanced faults in HVDC-connected wind power plants

A fixed topology Thévenin equivalent integral model for modular multilevel converters

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