Optimized hybrid PWM scheme for mitigating zero-crossing distortion in totem-pole bridgeless PFC

Fan, John Wing-To; Yeung, Ryan Shun-cheug; Chung, Henry Shu-Hung

doi:10.1109/apec.2018.8341299

Cited by 8 publications

(8 citation statements)

References 4 publications

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“…However, the total harmonic distortion (THD) of output current is 4.2% when the output power is 600 W, and it complies with the standard IEEE 519. In [24], an optimised hybrid PWM scheme is proposed to mitigate the zero-crossing distortion to improve THD. The experimental results demonstrate that the proposed current sharing control can equalise the output currents of two high-frequency arms and maintain a sinusoidal output current from the interleaved AC-DC power converter even under the transient of power change.…”

Section: Resultsmentioning

confidence: 99%

Power conversion interface with harmonic suppression for a DC grid and single‐phase utility

Wu¹,

Jou²,

Wu³

2020

IET Power Electronics

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This study proposes a power conversion interface for a DC grid and a single-phase utility. The proposed power conversion interface is configured using an interleaved AC-DC power converter and a DC hybrid power filter. The interleaved AC-DC power converter controls the real power between the DC grid and the single-phase utility in both directions. The interleaved AC-DC power converter can effectively reduce the high-frequency harmonic currents at both the AC side and DC side. A new current-sharing control method is used to equalise the currents in the interleaved power-electronic arms using only one current sensor in the interleaved AC-DC power converter. The DC hybrid power filter is connected between the DC bus of the interleaved AC-DC power converter and the DC grid. The DC hybrid power filter is controlled to be operated as a virtual low-frequency AC resistor connected to the DC grid in series and the low-frequency harmonic for the DC input current of the interleaved AC-DC power converter is suppressed. Accordingly, the problems of harmonic currents for a power conversion interface used between the DC grid and the single-phase utility are attenuated. A hardware prototype is developed to verify the performance of the proposed power conversion interface.

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Section: Resultsmentioning

confidence: 99%

Power conversion interface with harmonic suppression for a DC grid and single‐phase utility

Wu¹,

Jou²,

Wu³

2020

IET Power Electronics

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“…Note that the maximum values tend to infinite when wt = 0 and wt = π, while the minimum value is presented with wt = π/2. Fulfilment of the transversality condition in the complete range of operation is given when the α 1 /α 2 ratio is less than the minimum value of the curve (see (14)). According to Figure 2,(14) better expresses the condition of (13).…”

Section: Third Step: Validation Of Transversality Conditionmentioning

confidence: 99%

“…SBBC controllers are usually based on classic cascade PI or linear controllers which feature an external voltage loop and an inner current loop that use Pulse Width Modulation (PWM) for generating the required control signals and activating power switches. However, this kind of controllers present start-up overvoltages causing instability and affecting sensitive loads [10,[13][14][15][16][17]. Particularly, Kim et al [17] made a comparative analysis for PFC of several high efficiency AC/DC boost topologies.…”

Section: Introductionmentioning

confidence: 99%

“…Particularly, Kim et al [17] made a comparative analysis for PFC of several high efficiency AC/DC boost topologies. They showed that linear controllers allow obtaining high PFs and low THD i s; however, there are some issues to highlight: (1) DC voltage response has over peaks; (2) AC current stabilization time has a delay of several cycles in face of disturbances and load changes; and (3) the AC current waveform near zero crossing presents distortions [9,11,14]. In general terms, linear PI controllers are designed around an operating point which reduces the dynamic response in presence of large disturbances; furthermore, the dynamic performance of the controller is degraded when the operation region of the converter moves away from the equilibrium point used in the design [8,11,13].…”

Section: Introductionmentioning

confidence: 99%

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A Sliding Surface for Controlling a Semi-Bridgeless Boost Converter with Power Factor Correction and Adaptive Hysteresis Band

et al. 2021

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This paper proposes a new sliding surface for controlling a Semi-Bridgeless Boost Converter (SBBC) which simultaneously performs Power Factor Correction (PFC) and DC bus regulation. The proposed sliding surface is composed of three terms: First, a normalized DC voltage error term controls the DC bus and rejects DC voltage disturbances. In this case, the normalization was performed for increasing system robustness during start-up and large disturbances. Second, an AC current error term implements a PFC scheme and guarantees fast current stabilization during disturbances. Third, an integral of the AC current error term increases stability of the overall system. In addition, an Adaptive Hysteresis Band (AHB) is implemented for keeping the switching frequency constant and reducing the distortion in zero crossings. Previous papers usually include the first and/or the second terms of the proposed sliding surface, and none consider the AHB. To be best of the author’s knowledge, the proposed Sliding Mode Control (SMC) is the first control strategy for SBBCs that does not require a cascade PI or a hybrid PI-Sliding Mode Control (PI-SMC) for simultaneously controlling AC voltage and DC current, which gives the best dynamic behavior removing DC overvoltages and responding fast to DC voltage changes or DC load current perturbations. Several simulations were carried out to compare the performance of the proposed surface with a cascade PI control, a hybrid PI-SMC and the proposed SMC. Furthermore, a stability analysis of the proposed surface in start-up and under large perturbations was performed. Experimental results for PI-SMC and SMC implemented in a SBBC prototype are also presented.

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“…In the field of speech signal processing, short-term average zero-crossing rates are commonly used for endpoint detection of unvoiced and voiced speech. e zero-crossing rate is the ratio of the sign change of a signal [23]. If it is a sinusoidal signal, its average zerocrossing rate is twice the signal frequency divided by the sampling frequency, and the sampling frequency is fixed.…”

Section: Short-term Interval Zero-crossing Ratementioning

confidence: 99%

Hybrid Feature Extraction of Pipeline Microstates Based on Φ-OTDR Sensing System

Meng

et al. 2019

Journal of Control Science and Engineering

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This paper proposes a general integration method which can effectively describe the characteristics of pipeline leakage and help distinguish multiple pipeline microstates. Since the rapid development of Φ-OTDR in recent years, this technology has been applied to more and more fields, such as fiber optic safety monitoring, seismic monitoring, and structural health monitoring. Among them, Φ-OTDR has the characteristic of continuous full-scale monitoring in pipeline monitoring, but there are few researches on pipeline state characteristics at present. In this paper, based on the analysis of the pipeline state with Φ-OTDR technology, a method of extracting multiple microstates of pipelines is proposed. This method combined with the peak-to-average power ratio, short-term interval zero crossing, and fractal characteristics in the frequency domain can effectively characterize the microstate of pipes and provide support for identification of more microstates of pipelines. These features reflect the common characteristics of leaks in gas pipelines and liquid pipelines. Meanwhile, their combination features can represent the small differences in pipeline states. The experimental results show that the method can effectively characterize the microstate information of the pipeline, and the recognition rate of the hybrid feature under two kinds of pipeline leakage and multipressure conditions reaches 91% and 83%.

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Optimized hybrid PWM scheme for mitigating zero-crossing distortion in totem-pole bridgeless PFC

Cited by 8 publications

References 4 publications

Power conversion interface with harmonic suppression for a DC grid and single‐phase utility

Power conversion interface with harmonic suppression for a DC grid and single‐phase utility

A Sliding Surface for Controlling a Semi-Bridgeless Boost Converter with Power Factor Correction and Adaptive Hysteresis Band

Hybrid Feature Extraction of Pipeline Microstates Based on Φ-OTDR Sensing System

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