Nonlinear Effect of Dead Time in Small-Signal Modeling of Power-Electronic System Under Low-Load Conditions

Berg, Matias; Roinila, Tomi

doi:10.1109/jestpe.2020.2967341

Cited by 13 publications

(6 citation statements)

References 17 publications

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“…Note that this does not compromise the measurement precision, as the window length is equal to an integer multiple of each perturbation frequency. A sufficient dc bias current reference is also imposed to avoid zero crossings that are reported to cause nonlinear effects related to dead-times [23]. Note that dc component of the inductor current has no influence on AMs in the frequency range of interest.…”

Section: Comparison Between Ams During Ss-dc and S-ac Regimementioning

confidence: 99%

Accurate High-Frequency Modeling of the Input Admittance of PWM Grid-Connected VSCs

Cvetanovic

Petric

Mattavelli

et al. 2022

IEEE Trans. Power Electron.

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This article addresses high-frequency admittance modeling of current-controlled voltage source converters (VSCs). Recent studies have shown that harmonic instability may also occur at frequencies above the Nyquist frequency. To form an accurate multiple-frequency model in this frequency range, sidebands that originate from modulation and sampling must be examined. In this article, an accurate small-signal model is developed taking into account an adequate digital pulsewidth modulator (DPWM) representation, which allows to predict dependence of the frequency response on the steady-state dc (SS-dc) operating point. It is shown that when center-pulse sampling is implemented, pulsewidth modulation sidebands do not create additional loops leaving only sampling sidebands to be considered. Using the same approach as for SS-dc operation, a model that accurately represents admittance measurements during sinusoidal ac (S-ac) operation is developed. Its basis is a novel DPWM model suitable for S-ac regime, which allows to predict dependence of the VSC's input admittance on the grid voltage magnitude. Experimental and simulated admittance measurements, performed on a single-phase two-level VSC during various SS-dc and S-ac regimes, match with the proposed models up to twice the sampling frequency.

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Section: Comparison Between Ams During Ss-dc and S-ac Regimementioning

confidence: 99%

Accurate High-Frequency Modeling of the Input Admittance of PWM Grid-Connected VSCs

Cvetanovic

Petric

Mattavelli

et al. 2022

IEEE Trans. Power Electron.

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show abstract

“…Note that this does not compromise the measurement precision, as the window length is equal to an integer multiple of each perturbation frequency. A sufficient DC bias current reference is also imposed to avoid zero crossings which are reported to cause non-linear effects related to dead-times [20]. Note that DC component of the inductor current has no influence on AMs in the frequency range of interest.…”

Section: Comparison Between Am During Ss-dc and S-ac Regimementioning

confidence: 99%

Accurate High Frequency Modelling of the Input Admittance of PWM Grid-Connected VSCs

Cvetanovic¹,

Petric²,

Mattavelli³

et al. 2022

Preprint

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This paper addresses high frequency admittance modelling of current-controlled voltage source converters (VSCs). Recent studies have shown that harmonic instability may also occur at frequencies above the Nyquist frequency. To form an accurate multiple-frequency model in this frequency range, sidebands that originate from modulation and sampling must be examined. In this paper, an accurate small-signal model is developed taking into account an adequate digital pulse-width modulator (DPWM) representation, which allows to predict dependence of the frequency response on the steady-state DC (SSDC) operating point. It is shown that, when center-pulse sampling is implemented, PWM sidebands do not create additional loops leaving only sampling sidebands to be considered. Using the same approach as for SS-DC operation, a model which accurately represents admittance measurements during sinusoidal AC (S-AC) operation is developed. Its basis is a novel DPWM model suitable for S-AC regime, which allows to predict dependence of the VSC’s input admittance on the grid voltage magnitude. Experimental and simulated admittance measurements, performed on a single-phase two-level VSC during various SS-DC and S-AC regimes, show an excellent match with the proposed models up to twice the sampling frequency

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“…Due to the existence of dead-time, the output voltage of inverter contains voltage error related to current polarity. Several studies show that dead-time effect in the region of phase current close to zero is the main cause of rotor position estimation error [25][26][27][28]. When the phase current is close to zero, the existence of high-frequency signal causes the current polarity changes repeatedly, resulting in the voltage error at the injection frequency [25].…”

Section: Introductionmentioning

confidence: 99%

“…Several studies show that dead-time effect in the region of phase current close to zero is the main cause of rotor position estimation error [25][26][27][28]. When the phase current is close to zero, the existence of high-frequency signal causes the current polarity changes repeatedly, resulting in the voltage error at the injection frequency [25]. This causes distortion of high frequency current and affects accurate acquisition of rotor position information.…”

Section: Introductionmentioning

confidence: 99%

Special‐angle‐based signal injection sensorless control of IPMSM for suppressing multiple zero‐crossings of phase current

Tian

Wang

Zhang

et al. 2022

IET Power Electronics

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Pulsating high-frequency signal injection has the problem of multiple zero-crossings when the phase current crosses zero-point, which deteriorates the distortion of highfrequency current caused by the zero-current-clamping effect. Thus, the accuracy of position observation is affected. To suppress multiple zero-crossings, improved sinusoidal and square-wave signal injection schemes are proposed. First, the relationship between the injection angle of the high-frequency signal and the phase of the high-frequency response current amplitude function is analysed. Based on the relationship, a special injection angle is calculated. By injecting the pulsating signal in the obtained special angle, the phase of the high-frequency current is shifted. The amplitude of the high-frequency response current is minimum when the fundamental frequency current crosses zero, thus reducing zero-crossing points of phase current. Furthermore, the error signal extraction scheme applicable to arbitrary angle injection is designed to observe rotor position. The proposed high-frequency signal injection method minimises the zero-crossings of the phase current at any value of the torque angle. Both of the novel sinusoidal pulsating injection sensorless control scheme and square-wave injection sensorless control scheme are confirmed by experiments on a 2.2-kW interior permanent magnet synchronous motor (IPMSM) drive platform.

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Nonlinear Effect of Dead Time in Small-Signal Modeling of Power-Electronic System Under Low-Load Conditions

Cited by 13 publications

References 17 publications

Accurate High-Frequency Modeling of the Input Admittance of PWM Grid-Connected VSCs

Accurate High-Frequency Modeling of the Input Admittance of PWM Grid-Connected VSCs

Accurate High Frequency Modelling of the Input Admittance of PWM Grid-Connected VSCs

Special‐angle‐based signal injection sensorless control of IPMSM for suppressing multiple zero‐crossings of phase current

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