Current Control of Single-Phase VSC Systems With Inductor Saturation Using Inverse Dynamic Model-Based Compensation

Özkan, Ziya; Hava, Ahmet M.

doi:10.1109/tie.2019.2892682

Cited by 10 publications

(11 citation statements)

References 10 publications

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“…When the current dc-bias is zero, the rise time is approximately 3-4 ms whereas when the d-axis current dc-bias level is 10 A, the rise time of the CSCC method is around 1 ms. This bandwidth shrinkage phenomenon in 3P3W VSCs with CSCC is similar to the case that of single-phase controlled VSCs under dc excitation [8], [23].…”

Section: B Dynamic Responsesupporting

confidence: 65%

“…Considering the d-axis to d-axis and q-axis to q-axis magnitude plots in Fig. 5 (a) and (b) for θ = 0 and θ = π/3 under fullload operation, the d-axis bandwidth (ω BW −dd ) and q-axis bandwidth (ω BW −qq ) are observed to be much smaller than the design bandwidth ω BW which is called bandwidth shrinkage [8], [23] and elaborated in [7]. Moreover, the phase responses in Fig down to 62 degrees decreasing the robustness of the stability of the closed-loop current control system [22].…”

Section: A Command To Output Characteristicsmentioning

confidence: 99%

“…In [21], such correlation is demonstrated for 3P3W VSCs exhibiting linear system characteristics via frequency response functions. On the other hand, for VSCs employing saturable inductors, the dynamic response can still be utilized as an indicator of the system bandwidth as a function of time; wherein [8], [23], such a utilization has already been performed and verified for single-phase VSCs with saturable inductors. In this study, a similar approach is adapted to analyze 3P3W VSC systems employing saturable inductors.…”

Section: Introductionmentioning

confidence: 99%

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Inductor Saturation Compensation in Three-Phase Three-Wire Voltage-Source Converters via Inverse System Dynamics-II

Özkan¹,

Hava²

2020

Preprint

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Current waveform quality and current control bandwidth are the figures of merit for current controllers in three-phase three-wire (3P3W) voltage-source converter (VSC) systems. When saturable inductors are employed as converter side inductors due to cost, size, and energy conversion efficiency benefits in 3P3W VSCs with conventional synchronous frame current control (CSCC); substantial drawbacks arise by means of these figures of merit. In the preceding part of this study, an inverse dynamic model based compensation (IDMBC) method has been proposed to deal with these drawbacks. Complementarily, this paper presents a thorough analytical investigation of the control system characteristics of CSCC and IDMBC methods that affect the current waveform quality and current control bandwidth. The analyses are verified via dynamic response and waveform quality simulations and experiments that employ saturable inductors reaching $1/9^{th}$ of the zero-current inductance at full current. The results obtained demonstrate the suitability of the IDMBC method for 3P3W VSCs employing saturable inductors.

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Section: B Dynamic Responsesupporting

confidence: 65%

Section: A Command To Output Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Inductor Saturation Compensation in Three-Phase Three-Wire Voltage-Source Converters via Inverse System Dynamics-II

Özkan¹,

Hava²

2020

Preprint

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“…As the closed-loop control structure reached up in (13) is the same as that of a single-phase controlled VSC system, the design of PI controller becomes straightforward and identical to single-phase dc current control case for an L-R load [11]. Accordingly, the PI compensator parameters can be selected as K p = ω BWL and K i = ω BWR wherein ω BW is the design bandwidth [12], [32].…”

Section: A Conventional Synchronous Frame Current Control (Cscc) Of mentioning

confidence: 99%

“…Recently, research has been conducted to solve the inductor saturation based performance loss issues for single-phase controlled VSCs [6]- [12]. The approach for single-phase controlled VSC systems in [11] is generalized to 3P3W VSC systems in this study. Accordingly, this paper investigates the 3P3W VSCs with highly saturable inductors in terms of their performance characteristics and proposes an inverse dynamic model based compensation (IDMBC) method to overcome the inductor saturation based performance degradation of conventional synchronous frame current control (CSCC) methods.…”

Section: Introductionmentioning

confidence: 99%

Inductor Saturation Compensation in Three-Phase Three-Wire Voltage-Source Converters via Inverse System Dynamics-I

Özkan¹,

Hava²

2020

Preprint

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In three-phase three-wire (3P3W) voltage-source converter (VSC) systems, utilization of filter inductors with deep saturation characteristics is often advantageous due to the improved size, cost, and efficiency. However, with the use of conventional synchronous frame current control (CSCC) methods, the inductor saturation results in significant dynamic performance loss and poor steady-state current waveform quality. This paper proposes an inverse dynamic model based compensation (IDMBC) method to overcome these performance issues. Accordingly, a review of inductor saturation and core materials is performed, and the motivation on the use of saturable inductors is clarified. Then, two-phase exact modelling of the 3P3W VSC control system is obtained and the drawbacks of CSCC have been demonstrated analytically. Based on the exact modelling, the inverse system dynamic model of the nonlinear system is obtained and employed such that the nonlinear plant is converted to a fictitious linear inductor system for linear current regulators to perform satisfactorily.

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Nonlinear models of power inductors: A survey

Oliveri

Lodi

Storace

2021

Circuit Theory & Apps

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Summary Switch‐mode power supplies (SMPSs) are widely exploited to interface electrical energy sources to motors and other electrical loads. Inductors are usually the biggest and heaviest components in SMPSs, limiting their overall power density. Therefore, there is an increasing interest in designing SMPSs with partially saturating inductors, because this significantly reduces their weight and size, thus increasing power density. This paper provides a review of nonlinear behavioral models (based on easy‐to‐measure quantities) of the inductance, power loss, and temperature rise of inductors working, at least partially, in magnetic saturation. This survey discusses the pros, cons, and ranges of validity of these models, with a glimpse at their application to SMPS simulation, design, monitoring, and control.

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Current Control of Single-Phase VSC Systems With Inductor Saturation Using Inverse Dynamic Model-Based Compensation

Cited by 10 publications

References 10 publications

Inductor Saturation Compensation in Three-Phase Three-Wire Voltage-Source Converters via Inverse System Dynamics-II

Inductor Saturation Compensation in Three-Phase Three-Wire Voltage-Source Converters via Inverse System Dynamics-II

Inductor Saturation Compensation in Three-Phase Three-Wire Voltage-Source Converters via Inverse System Dynamics-I

Nonlinear models of power inductors: A survey

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