A Switching Sequence Optimization Method (SSOM) to Eliminate the Dead-Time Unexpected Output Levels for Four-Level Nested Neutral Point Clamped Converter

Xin, Ziyue; Xiao, Fei; Hu, Liangdeng

doi:10.1109/tte.2021.3070191

Cited by 11 publications

(3 citation statements)

References 22 publications

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“…These methods employ complex models and adjustment mechanisms that are highly sensitive to parameters. The second category of methods is developed based on the mean value theory [18][19][20][21][22][23]. Among them, for the case that the normal sampling-based dead-time compensation method is often disturbed by current ripple, [18] was able to improve the accuracy of the compensation by deriving real-time ripple to reconstruct the current trajectory.…”

Section: Introductionmentioning

confidence: 99%

“…A dead‐time compensation method based on terminal voltage A/D conversion was proposed in [20] to determine the current polarity instead of relying on the current sensor. Reference [21] proposed a method based on switching sequence optimization, which essentially adjusts the average output within a switching cycle, although the converter configuration is different. Reference [22] based on a step‐by‐step voltage compensation on the basis of the current error evaluated within each control interval.…”

Section: Introductionmentioning

confidence: 99%

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Output quality improvement for single‐phase inverter in V2G system

Wang,

Liu,

Kwak

et al. 2024

IET Power Electronics

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In vehicle‐to‐grid (V2G) applications, a voltage source inverter (VSI) directly connects to a residential load or grid for DC/AC conversion and power flow control. In VSI, dead‐time is employed to prevent the breakdown of switching devices, however, the introduction of dead‐time leads to distortions of output voltage and current in both stand‐alone and grid‐tie modes. For the case of a power factor of 1, by analyzing the dead‐time effect of digital‐controlled double‐frequency sinusoidal pulse width modulation, a compensation amount is proposed to introduce in the modulation signals, the value of which is half of the delay register that generates a dead‐time of td. Moreover, considering the phase delay caused by hardware and software filtering in sampling, the grid‐tie mode control strategy based on dead‐time compensation is further proposed, which introduces the grid voltage as a feedforward signal. A 3.5 kW V2G experimental prototype is built and tested to verify the feasibility of the proposed strategies. The simulation and experimental results show that the proposed methods are effective for both modes, which improve the output distortion for different dead‐time without additional hardware circuits.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Output quality improvement for single‐phase inverter in V2G system

Wang,

Liu,

Kwak

et al. 2024

IET Power Electronics

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“…In [21] and [22], a method called CB3L is proposed, which used the carefully designed equivalent three‐level signals to balance the capacitors voltage and realized the low frequency control. The dead time effects are further optimized based on CB3L method in [23] and [24], but its capacitors voltage regulation ability is relatively poor.…”

Section: Introductionmentioning

confidence: 99%

Research on voltage regulation ability of four‐level nested clamp converter based on virtual space vector modulation

Xiao

Xin

2023

IET Power Electronics

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The four‐level nested neutral point clamped (4L‐NNPC) converter is a new multi‐level converter with a simple topology, which is suitable for the medium‐voltage application. But it has voltage balancing problems under the low output frequency condition. A space virtual vector modulation (SVVM) algorithm is introduced in this paper, and the dwell time formulas are given. It uses the synthesis between vectors to optimize the dwell time of each level in the virtual vector, in order to balance the flying capacitor voltage in the carrier period. In order to explore the boundary of the voltage regulation ability of the 4L‐NNPC converter, this paper analyses the mechanism of the voltage fluctuation of the flying capacitors and derives the voltage fluctuation formulas. The voltage regulation ability is calculated in different sectors, and the influence of the modulation ratio and power factor is explored. Finally, the voltage regulation ability under the sudden load and the flying capacitor voltage deviating from the rated value were investigated through simulation and experiments, which verified the correctness of the proposed theory.

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