Enhanced Time Average Model of Three Phase Voltage Source Converter Taking Dead-Time Distortion Effect Into Account

Rahman, Arief Noor; Chiu, Huang‐Jen; Lian, Kuo Lung

doi:10.1109/access.2021.3056799

Cited by 4 publications

(9 citation statements)

References 10 publications

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“…) is demanded to be precisely calculated based on the AFE rectifier parameters and variables as follows [42,43]:…”

Section: Enhanced Dead-time Distortion Modelmentioning

confidence: 99%

“…here, the modulation index According to the ripple current, an improved duty cycle based on an enhanced deadtime distortion model, which is approximated in five levels, is defined to reduce the THD of IAVM as follows [43]: Each block of the proposed IAVM approach along with D abc will be clarified in the following subsections.…”

Section: Enhanced Dead-time Distortion Modelmentioning

confidence: 99%

“…This target can be achieved by considering a ripple current to allocate relevant duty cycles instead of zero. To estimate the ripple current (I p ) for each rectifier phase leg, the difference between peak-to-peak ripples (∆I pp ) is demanded to be precisely calculated based on the AFE rectifier parameters and variables as follows [42,43]:…”

Section: Enhanced Dead-time Distortion Modelmentioning

confidence: 99%

“…According to the ripple current, an improved duty cycle based on an enhanced deadtime distortion model, which is approximated in five levels, is defined to reduce the THD of IAVM as follows [43]:…”

Section: Enhanced Dead-time Distortion Modelmentioning

confidence: 99%

“…The studied five-level dead-time distortion model is illustrated in Figure 4 and integrates the ripple current calculator with the enhanced duty cycle model. A limiter is also added to the model to maintain the outputs of duty cycles D abc in a range between 0 and 1 [43].…”

Section: Enhanced Dead-time Distortion Modelmentioning

confidence: 99%

See 4 more Smart Citations

Improved Dynamic Performance of Average-Value Modelled Active Front-End Rectifiers

Ebadpour

2024

Electronics

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Active front-end (AFE) rectifiers have become widely employed in power systems to achieve unity power factor and harmonic mitigations. The typical modeling approaches applied for AFE rectifiers in the literature mostly relied on two baselines: the detailed model and the time-average model. The former approach deals with the switching element model (SEM), which leads to significant harmonics in currents with distorted waveforms. The latter approach uses the average-value model (AVM) to overcome the currents’ harmonics as well as provide fast responses. However, even the AVM baseline has shown problems during the starting stage (lack of control signals) and over the dead-time periods, which causes serious issues in the implementation process. This paper presents an improved dynamic AVM for AFE rectifiers by precisely considering the issues mentioned above, along with the practical starting procedure and desirable initialization. The studied AFE rectifier is developed using the voltage-oriented control (VOC) technique based on the different modeling methodologies, including SEM, Conventional AVM, and the proposed AVM. The performance of all models is analyzed and compared using simulation results with MATLAB/Simulink R2023a Function blocks for all the algorithm parts and SimScape elements for the electrical circuit model. The simulation results illustrate that the performance of the proposed AVM approach can closely resemble the behavior of the SEM baseline with low harmonic distortion. To evaluate the performance of the proposed model, several case studies are investigated to verify the AFE rectifier operation, regarding mostly the total harmonic distortion (THD) wherein the THD percentages are improved to 4.78 and 2.5 from 5.14 and 2.78 for low- and high-power loads, respectively.

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“…) is demanded to be precisely calculated based on the AFE rectifier parameters and variables as follows [42,43]:…”

Section: Enhanced Dead-time Distortion Modelmentioning

confidence: 99%

Section: Enhanced Dead-time Distortion Modelmentioning

confidence: 99%

Section: Enhanced Dead-time Distortion Modelmentioning

confidence: 99%

Section: Enhanced Dead-time Distortion Modelmentioning

confidence: 99%

Section: Enhanced Dead-time Distortion Modelmentioning

confidence: 99%

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Improved Dynamic Performance of Average-Value Modelled Active Front-End Rectifiers

Ebadpour

2024

Electronics

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Converter Averaging Approach for Modeling a Residential Supply Subsystem

Martínez-Caballero,

Kot,

Milczarek

et al. 2023

2023 IEEE 17th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG)

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Numerically Efficient Average-Value Model for Voltage-Source Converters in Nodal-Based Programs

EBRAHIMI,

Vahabzadeh,

Jatskevich

2024

IEEE Open J. Power Electron.

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Discrete detailed models of high-frequency switching voltage source converters (VSCs) are accurate but computationally expensive in simulations of large power-electronics-based systems. For fast/efficient studies, the average-value models (AVMs) of VSCs have proven indispensable, which conventionally utilize controlled voltage/current sources to interface with external circuits. In nodal-analysis-based electromagnetic transient (EMT) simulation programs with a non-iterative solution, the interfacing variables are computed based on the values of input voltages/currents calculated at the previous time step. This delay may cause numerical inaccuracy and/or instability at large simulation time steps. Recently, a so-called directlyinterfaced AVM (DI-AVM) has been developed for VSCs that avoids this delay. In this paper, the formulation of the DI-AVM is generalized for an arbitrary configuration of the interfacing nodes. This is done by formulating the extended equivalent conductance matrix for the VSC AVM, assuming all nodes are floating. The generalized conductance matrix is then merged into the overall network nodal equation. The extended DI-AVM is verified in PSCAD/EMTDC against the traditional dependentsource-based AVMs under both balanced and unbalanced conditions and is demonstrated to outperform the conventional AVMs in terms of numerical accuracy at large time steps.

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Enhanced Time Average Model of Three Phase Voltage Source Converter Taking Dead-Time Distortion Effect Into Account

Cited by 4 publications

References 10 publications

Improved Dynamic Performance of Average-Value Modelled Active Front-End Rectifiers

Improved Dynamic Performance of Average-Value Modelled Active Front-End Rectifiers

Converter Averaging Approach for Modeling a Residential Supply Subsystem

Numerically Efficient Average-Value Model for Voltage-Source Converters in Nodal-Based Programs

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