Advanced resampling techniques for PWM amplifiers in real-time applications

Burstinghaus, Edward J.; Ledwich, Gerard; Walker, Geoffrey R.; Pezeshki, Houman; Broadmeadow, Mark A. H.

doi:10.1109/spec.2016.7846073

Cited by 3 publications

(6 citation statements)

References 5 publications

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“…5 a shows the response of the modulator for a carrier frequency of 8 kHz and resampling frequency of 50.4 kHz, which represents a 3.15 times increase when compared to the 16 kHz sampling frequency that would be used in conventional asymmetrical regular PWM. Note that the experimental data show excellent agreement with the predicted theoretical magnitude and phase responses [5]. It should also be noted that this analysis extends well beyond the carrier frequency of 8 kHz, which is possible due to the carrier frequency harmonic cancellation properties of multi‐level phase‐shifted carrier PWM, and the resampling process.…”

Section: Resultssupporting

confidence: 68%

“…One method by which the performance of true natural sampling can be approached using a digital controller is to increase the rate at which the effective modulating signal is updated, which is referred to as resampled PWM [4]. If constraints such as control law calculation time or analogue‐to‐digital conversion (ADC) hardware limit the rate at which the modulating signal can be updated, a first‐order hold (FOH) algorithm can be used to realise additional improvements in the delay and harmonic performance of the modulator [5]. Substantial software calculations are necessary if this method is implemented on a typical microcontroller, however, and these can compromise the performance benefits.…”

Section: Introductionmentioning

confidence: 99%

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FPGA implementation of an arbitrary resample rate, FOH, pulse width modulator

Broadmeadow

Burstinghaus

Walker

et al. 2019

J. eng.

Self Cite

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Section: Resultssupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

FPGA implementation of an arbitrary resample rate, FOH, pulse width modulator

Broadmeadow

Burstinghaus

Walker

et al. 2019

J. eng.

Self Cite

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“…The control delay and the dissipative region for single-valley sampling PWM with the update instant shift (SVS_UIS) are given in ( 19)- (20). The control delay for the SVS_UIS PWM is a piecewise function, which jeopardizes the system stability when the duty cycle is smaller than the critical duty cycle.…”

Section: ) With Sampling Instant Shiftmentioning

confidence: 99%

“…In order to suppress the aliasing, various repetitive filters are proposed in DC-DC and DC-AC converters, where the introduced phase lag is the main optimization goal [13][14][15][16]. Another switching ripple suppression method is to change the sampling process or the carrier, but the feasibility should be further investigated [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

A Review of Multisampling Techniques in Power Electronics Applications

Zhou

Wang

et al. 2022

IEEE Trans. Power Electron.

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Due to the increasing performance and decreasing price of microcontrollers in recent years, applying a high sampling frequency becomes more feasible in modern control that is known as multi-sampling technology. The first motivation to use multisampling is emulating the analog control, and thereby reducing the control delay and improving the stability of power electronics controllers. On the other hand, more information can be acquired from the multi-sampled current/voltage, which helps to save the cost and improve the reliability. In this paper, a review of the multi-sampling application in power electronics converters is provided. Starting from the control delay analysis in single/double-sampling control, the modelling, implementation and related control strategies are given when using multi-sampling pulse width modulation (PWM). Then, based on the multisampled data, the applications in condition monitoring and parameter estimation are discussed. Lastly, perspectives on challenges and future trends are discussed.

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“…Second, by replacing the zero-order hold with first-order hold in the sampling process, the modulation signal is more like a continuous signal using multi-update PWM. The arbitrary sampling rate can be used with improved harmonic performance, linearity and phase delay compared with zero-order hold [30][31]. But first-order hold based sampler is still new, and the small signal stability analysis and controller design need to be further researched.…”

Section: Introductionmentioning

confidence: 99%

Aliasing Suppression of Multisampled Current-Controlled LCL-Filtered Inverters

Zhou

Wang

et al. 2022

IEEE J. Emerg. Sel. Topics Power Electron.

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Multisampling control provides an attractive way to reduce the control delays in LCL-filtered grid-connected inverters. Thereby, the bandwidth and stability margin will be improved. However, high frequency switching harmonics (SHs) is introduced in the control loop when the inverter-side current is sampled. In order to investigate the effect of multisampled high frequency SHs, the relationship between the double-update pulse width modulation (PWM) and multiupdate PWM is deduced through geometric deduction. It is shown that the multi-update PWM is equivalent to doubleupdate PWM with sampling instant shift, and the equivalent Nyquist frequency is equal to the switching frequency. Moreover, the non-averaged value of current is sampled within one switching period and aliased low-order harmonics will appear in the grid-side current. Hence, filtering the multisampled SHs is necessary, and an improved repetitive filter is proposed to remove all the sampled SHs and keep the advantage of phase boost by using the multisampling control. The method is evaluated with a single-loop inverter-side current control, and its effectiveness is verified through the simulation and experiment.

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Advanced resampling techniques for PWM amplifiers in real-time applications

Cited by 3 publications

References 5 publications

FPGA implementation of an arbitrary resample rate, FOH, pulse width modulator

FPGA implementation of an arbitrary resample rate, FOH, pulse width modulator

A Review of Multisampling Techniques in Power Electronics Applications

Aliasing Suppression of Multisampled Current-Controlled LCL-Filtered Inverters

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