Simplified dynamic model of a voltage-sourced converter with modular multilevel converter design

Teeuwsen, S.P.

doi:10.1109/psce.2009.4839922

Cited by 78 publications

(32 citation statements)

References 2 publications

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“…Here, R fbeq is as given in Equation (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19) and V fbeq as given in Equation (4-21). …”

Section: -19mentioning

confidence: 99%

“…The sub-module internal currents and voltages, as marked in Figure 4-17 can readily be calculated using Equation (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23). These values are obtained using a simple circuit solution of …”

Section: Half-bridge Modelmentioning

confidence: 99%

“…The proposed equivalent model matches the transients as well as steady state behaviour of the full detailed model even for this condition of mal-operation. In contrast to averaged models [13], [85] …”

Section: Simulation Of a Module Switch Failurementioning

confidence: 99%

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Efficient Modeling of Modular Multilevel HVDC Converters (MMC) on Electromagnetic Transient Simulation Programs

Gnanarathna

Gole

Jayasinghe

2011

IEEE Trans. Power Delivery

681

306

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I AbstractThe recent introduction of a new converter topology, the modular multilevel converter (MMC) is a major step forward in voltage sourced converter (VSC) technology for high voltage, high power applications. To obtain a multilevel ac output waveform, a large number of semiconductor switches has to be used in the converter. The number of switches in the MMC for HVDC transmission is typically two orders of magnitudes larger than that in a two or three level VSC used in earlier generation. This large device count creates a computational challenge for electromagnetic transients (EMT) simulation programs, as it significantly increases the simulation time. The purpose of this research is to investigate whether the simulation can be speeded up. With the assumption of ideal switch operation and using an equivalent average capacitor value based approach, an average valued model of MMC is also proposed in this thesis. The average model can be accurately used in most of the system level studies.The control algorithms and other modeling aspects of MMC applications are also presented in this thesis. Abstract IIOne of the advantages of multilevel converters is the low operating losses as the smaller switching frequency of each individual power electronics switch and the low voltage step change during each switching. Using a recently developed, time domain simulation approach, the operating losses of the MMC converter are estimated in this thesis. When comparing the MMC operating losses against the losses of two-level VSC, the power loss for the two-level VSC is found to be significantly higher than the power loss of the MMC.

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“…Here, R fbeq is as given in Equation (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19) and V fbeq as given in Equation (4-21). …”

Section: -19mentioning

confidence: 99%

Section: Half-bridge Modelmentioning

confidence: 99%

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Efficient Modeling of Modular Multilevel HVDC Converters (MMC) on Electromagnetic Transient Simulation Programs

Gnanarathna

Gole

Jayasinghe

2011

IEEE Trans. Power Delivery

681

306

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“…A phasor MMC model was first described in [2]. A number of recent publications have adopted the same modeling approach for the MMC as for the two or three-level VSC, though with small modifications.…”

Section: Introductionmentioning

confidence: 99%

On the modeling of MMC for use in large scale dynamic simulations

Freytes

Papangelis²,

Saad³

et al. 2016

2016 Power Systems Computation Conference (PSCC)

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Abstract-This paper focuses on simplified models of the Modular Multilevel Converter suitable for large-scale dynamic studies, in particular simulations under the phasor approximation. Compared to the existing literature, this paper does not a priori adopt the modeling approach followed for the original twolevel or three-level Voltage Source Converter. On the contrary, a model is derived following a physical analysis that preserves its average internal dynamic behavior. An equivalent control structure is proposed and various alternatives are highlighted. The proposed model with its controllers has been implemented in a phasor simulation software and its response has been validated against a detailed Electromagnetic Transient model. Finally, an illustrative example is presented with the application of the proposed model on a large grid consisting of AC areas interconnected with a multi-terminal DC grid.

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“…These models are very efficient computationally since the IGBTs are not explicitly represented and, in addition, they assume that all the inner variables (such as capacitor voltages or circulating current) are perfectly controlled. AVMs based on switching functions take into account the IGBT switching and, hence, the harmonics, whereas AVMs based on fundamental frequency only consider fundamental frequency components [15,23]. The main limitation that these models present is their inability to simulate dc-side transients as well as to represent the internal converter dynamics.…”

Section: Introductionmentioning

confidence: 99%

Efficient model for modular multi-level converter simulation

Vidal-Albalate

Belenguer

Beltrán

et al. 2016

Mathematics and Computers in Simulation

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Detailed models of modular multi-level converters (MMCs) are cumbersome for electromagnetic transient simulation programs because of their high number of components which involve large simulation times. In this work, the modeling of an MMC is addressed with the objective of reducing the simulation time. First, the MMC structure is presented, including the modulation technique, the voltage balancing algorithm and the circulating current control used to validate the model. Next, an efficient simplified model is proposed. This is formed by just one variable voltage source, one variable capacitor and one variable resistor per arm, regardless of the number of submodules. This simplified model allows the simulation time to be reduced while keeping the dynamics of the MMC. The comparison through several PSCAD simulations with a detailed 5-level MMC model proves its validity during both steady-state and transient conditions (ac and dc short-circuits).

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Simplified dynamic model of a voltage-sourced converter with modular multilevel converter design

Cited by 78 publications

References 2 publications

Efficient Modeling of Modular Multilevel HVDC Converters (MMC) on Electromagnetic Transient Simulation Programs

Efficient Modeling of Modular Multilevel HVDC Converters (MMC) on Electromagnetic Transient Simulation Programs

On the modeling of MMC for use in large scale dynamic simulations

Efficient model for modular multi-level converter simulation

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