Robust hysteresis current-controlled PWM scheme with fixed switching frequency

Kang, B.J.; Liaw, C.M.

doi:10.1049/ip-epa:20010608

Cited by 31 publications

(7 citation statements)

References 10 publications

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“…The switching frequency is not fixed [11,12] and it varies according to the error band and system parameters. By using instantaneous reactive power theory [13][14][15] and mixed coordinate instantaneous compensation method described in Sect. 2.2, the reference tracking current can be calculated.…”

Section: Hysteresis Pwm For Two-level Four-leg Vsimentioning

confidence: 99%

Active Power Filters

Wong

Dai

Lam

2016

Parallel Power Electronics Filters in Three-Phase Four-Wire Systems

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In this chapter, the active power filters are discussed. In Sect. 3.1, the development of active power filters are reviewed; active power filters with different circuit configurations are given and compared. The three-phase four-wire active power filter using a two level four-leg voltage source inverter (VSI) is discussed in Sect. 3.2. Three-phase four-wire active power filters using two-level and three-level three-leg center-split VSI are discussed in Sect. 3.3. The modeling, voltage control signal calculation, space vector analyses and pulse width modulation (PWM) methods for each configuration are introduced and addressed in these two Sections. Furthermore, dc link voltage variation control of the center-split VSI is discussed in Sect. 3.3. In Sect. 3.4, the operational principal of three-phase four-wire multi-level VSIs as active power filter is briefly introduced. In Sect. 3.5, the generalized PWM for multi-level three-leg center-split and four-leg VSIs are introduced. Finally, the design and implementation of an active power filter is introduced in Sect. 3.6.

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Section: Hysteresis Pwm For Two-level Four-leg Vsimentioning

confidence: 99%

Active Power Filters

Wong

Dai

Lam

2016

Parallel Power Electronics Filters in Three-Phase Four-Wire Systems

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“…Many attempts using the hysteresis control of input inverters have been made, like in Buso et al (2000). Some of them even tried to achieve fixed switching frequency (Kang and Liaw, 2001; Galillei et al , 2005). Few attempts have also been made to control the RSW system using the hysteresis control (Klopcic et al , 2008; Zhou and Cai, 2011).…”

Section: Control Of the Rsw Systemsmentioning

confidence: 99%

Eliminating short switching cycles when using hysteresis control of resistance spot welding systems

Černelič

Brezovnik

Sukič

et al. 2017

COMPEL

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Purpose This paper aims to present two hysteresis-control algorithms designed for medium-frequency, direct-current, resistance-spot-welding (MFDC RSW) systems. The first proposed control algorithm (MSCHC) eliminates the short switching cycles that can occur when using the existing hysteresis-control algorithms. This control minimises the number of switching cycles that are needed to generate the selected welding current. The welding-current ripple can be high when using this control algorithm. Therefore, a second algorithm (HCRR) is presented that reduces the welding-current ripple by half. Design/methodology/approach The proposed hysteresis controllers consist of the transformer’s magnetic-flux-density hysteresis regulator and a welding-current hysteresis regulator. Therefore, the welding current must be measured and the saturation of the iron core must be detected. The proposed hysteresis controller supplies the inverter with the signals needed to generate the supply voltage for the RSW transformer, which then generates the selected welding current. Findings The proposed MSCHC algorithm produces the smallest possible number of switching cycles needed to generate the selected welding current. The high welding-current ripple can be reduced if the number of switching cycles is increased. The observed number of switching cycles and the welding-current ripple change if the welding resistance and/or inductance change. Originality/value The number of switching cycles can be minimised when using the first proposed control algorithm (MSCHC), and so the switching power losses can be minimised. If the welding-current ripple produced by the first control algorithm is unacceptable, the second control algorithm (HCRR) can reduce it by increasing the number of switching cycles.

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“…is equivalent to modulation wave.Current sis ABC and CDE are projected to get carrier 1 Z and 2 Z respectively. Cycle size of each projected triangle does not necessarily equal which is proportional to loop wide h .In order to make the current hysteresis cycle equal to realize switch frequency constant,constant switching frequency current hysteresis control is extensive researched [2][3][4][5][6] . A simplified variable loop width constant frequency current hysteresis control method is available from the reference [2][3][4][5][6] .It only need to dynamically adjust the loop width to achieve switch frequency constant.…”

Section: B Simplified Variable Loop Width Constant Frequency Current ...mentioning

confidence: 99%

A New Modulation Method Based on Current Hysteresis Control for Cascaded H-Bridge Inverter

Yang

Zhu

2012

AMR

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This paper puts forward a current hysteresis control method suitable for cascaded H-bridge inverter. It has the following characteristics : The control method is similar to unipolar SPWM modulation for a single H bridge.It is simple for pulse generator and can effectively reduce the switching losses; The phase-shifted control pulse for multi H bridges of a phase with current hysteresis control can be generated which is similar to the phase shift SPWM by dynamically adjusting the width of hysteresis to keep power device switching frequency constant; It retains fast response, internal current limiting and with good stability for current hysteresis control.At last, the experimental results verify the correctness of the proposed method.

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Robust hysteresis current-controlled PWM scheme with fixed switching frequency

Cited by 31 publications

References 10 publications

Active Power Filters

Active Power Filters

Eliminating short switching cycles when using hysteresis control of resistance spot welding systems

A New Modulation Method Based on Current Hysteresis Control for Cascaded H-Bridge Inverter

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