An analog implementation to improve load transient response of PFC pre-regulators

Cheung, M.K.H.; Chow, M.H.L.; Tse, Chi Kong

doi:10.1109/intlec.2007.4448900

Cited by 6 publications

(3 citation statements)

References 13 publications

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“…( 37)) for a given PM * V , increasing ω n is equivalent to increasing the voltage loop bandwidth. Moreover, the right-hand side within the brackets of (46) implies that ω G = α min •100π would also be the worst case in terms of contribution to the DC link voltage deviation. It should be recalled that in an earlier work [51], the desired undershoot value rather than the minimal tolerable phase margin was used as a performance merit, yielding excessive stability at the expense of a larger DC link voltage overshoot.…”

Section: Dynamic Responsementioning

confidence: 99%

“…The implementation of approaches based on nonlinear and/or time-varying control proposed in [37][38][39][40] call for a high-performance microcontroller. On the other hand, linear filtering-based methods proposed in [41][42][43][44][45][46][47] seem to be much simpler in terms of analysis and implementation. In particular, compensators combining a PI or type-II term with a notch filter may be easily realized either digitally or by a simple analog network.…”

Section: Introductionmentioning

confidence: 99%

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Design of Dual-Notch-Filter-Based Controllers for Enhancing the Dynamic Response of Universal Single-Phase Grid-Connected Power Converters

Borafker,

Strajnikov,

Kuperman

2023

Applied Sciences

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Trade-off between transient response and grid-side current quality is a well-known issue of single-phase mains-connected power converters. A dual-loop control structure (usually based on PI or type-II controllers) is typically employed in such systems to regulate the DC link voltage to a constant reference (in order to maintain power balance) while forcing the grid-side current to have a specific shape (in order to comply with power quality requirements). Introducing notch term/s (tuned to certain multiple/s of the mains base frequency) into one of the loops allows either for the improvement of the dynamic performance without worsening the total harmonic distortion of grid-side current or for the enhancement of the current quality without impairing the dynamic response. Since the maximum tolerable value of total harmonic distortion is typically imposed by a certain power quality standard, it is desirable to enhance the transient response of the power converter system as much as possible while keeping the total harmonic distortion at the maximum allowed value. However, universal off-grid operating power conversion systems must support both 50 Hz and 60 Hz mains; consequently, tuning the notch term/s to 50 Hz multiple/s would not be sufficient for a 60 Hz mains operation and vice-versa. Consequently, this work examines the possibility of introducing a dual-notch term into the control loop in order to cover both above-mentioned base frequencies. It is demonstrated that under typical base frequency uncertainty values, the performances of dual-notch terms are nearly decoupled so that the term tuned to a 50 Hz frequency (and optionally to its multiples) has nearly no influence at a 60 Hz mains operation and vice-versa. Consequently, the methodology allows for the improvement of the dynamics of universal grid-connected power converters without total harmonic distortion (THD) deterioration. A stability analysis of the proposed control structure is carried out and quantitative design guidelines, allowing for the attainment of an optimized dynamic response for a given maximum tolerable total harmonic distortion, minimum allowed phase margin and a certain base frequency uncertainty, are established. It is shown that a DC link voltage loop bandwidth of 52 Hz may be attained while keeping the grid-side current THD below 5%. Simulations and experimental results support well the proposed design methodology.

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Section: Dynamic Responsementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of Dual-Notch-Filter-Based Controllers for Enhancing the Dynamic Response of Universal Single-Phase Grid-Connected Power Converters

Borafker,

Strajnikov,

Kuperman

2023

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…Since the voltage and current waveforms at the output of the input diode bridge rectifier are rectified sinusoidal signals, they will have a 120 Hz component. This 120 Hz component will appear as a similar component of the same frequency at the output so that the output will require additional filtering, but doing so results in a very slow dynamic response [8]- [9]. The control method designed and implemented in order to minimize the 120 Hz output ripple component is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

A new modeling approach for AC-DC singlestage converters with more than one inductor operating with discontinuous current

Rezaei

Moschopoulos

2014

2014 IEEE 36th International Telecommunications Energy Conference (INTELEC)

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The main objective of this paper is to propose a new state-space modeling approach for AC-DC single-stage power factor correction (PFC) buck-boost converters by using a modified version of conventional state-space modeling approach. In the paper, the operation of a singlestage PFC buck-boost converter is briefly reviewed and the proposed modeling approach is introduced and explained in detail. It is then shown how a small-signal model and key transfer functions can be extracted from the average statespace model of such a converter. The output to input smallsignal transfer functions of the converter that are generated using this approach can then be used to keep the small-signal values at zero so that the states of the system can operate at their predefined steady-state conditions.

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A new control scheme for an AC-DC single-stage buck-boost PFC converter with improved output ripple reduction and transient response

Rezaei

Golbon

Moschopoulos

2014

2014 IEEE Applied Power Electronics Conference and Exposition - APEC 2014

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An analog implementation to improve load transient response of PFC pre-regulators

Cited by 6 publications

References 13 publications

Design of Dual-Notch-Filter-Based Controllers for Enhancing the Dynamic Response of Universal Single-Phase Grid-Connected Power Converters

Design of Dual-Notch-Filter-Based Controllers for Enhancing the Dynamic Response of Universal Single-Phase Grid-Connected Power Converters

A new modeling approach for AC-DC singlestage converters with more than one inductor operating with discontinuous current

A new control scheme for an AC-DC single-stage buck-boost PFC converter with improved output ripple reduction and transient response

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