Modular multilevel converter models for electromagnetic transients

Abstract

Electrical engineering, Polytechnique Modular multilevel converters (MMCs) may contain numerous IGBTs. The modeling of such converters for electromagnetic transient type (EMT-type) simulations is complex. Detailed models used in MMC-HVDC simulations may require very large computing times. Simplified and averaged models have been proposed in the past to overcome this problem. In this paper existing averaged and simplified models are improved in order to increase their range of applications. The models are compared and analyzed for different transient events on a MMC-HVDC system.

Flexible HVDC transmission systems small signal modelling: A case study on CIGRE Test MT-HVDC grid

“…3 along with its main control loops [18], [19]. Assuming a set of well-balanced Sub-Module (SM) voltages together with the appropriate handling of double frequency circulating current (e.g., by implementing a passive filter or using an extra supplementary control loop [20]), the classical Averaged Value Model (AVM) approach that is widely applied to 2 (and 3)-level converters can be easily generalized to the MMC.…”

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

“…The starting point of the derivation is the AAM, a simplification of the detailed MMC model that has been proposed in order to accelerate the simulation of MMC EMT models and investigate different control strategies [8].…”

“…The reference for the validation is the so-called Model #2 ,i.e. equivalent circuit based model in [8], or Model #4 in [15], of a 401-level converter implemented in the EMTP-RV software [16]. The control structure used in the reference model is equivalent to the one presented for the simplified model.…”

HVDC grid control system based on autonomous converter control

“…There are many techniques for modelling a HB-MMC [5,6]. Average Value Models (AVMs) are used to represent the HBMMCs for this work since their accuracy is sufficient for the studies being conducted and they are significantly more computationally efficient than the more detailed models [5].…”

“…Average Value Models (AVMs) are used to represent the HBMMCs for this work since their accuracy is sufficient for the studies being conducted and they are significantly more computationally efficient than the more detailed models [5]. The MMC-AVM used in this system is implemented and parameterised according to [7].…”