Review on DC link capacitor issues in variable frequency drives

Kavitha, Veeraruna; Subramanian, K.

doi:10.1109/icieeimt.2017.8116839

Cited by 3 publications

(3 citation statements)

References 16 publications

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“…A dc-link capacitor is commonly used to handle the voltage fluctuation in a converter topology [5]. It acts to filter out the ripple voltage and current, while also becoming an important energy storage device [15]. Various types of capacitor technology may be used.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Capacitor for the voltage-surge suppression in a SiC-MOSFET half-bridge inverter

Hasanah,

Djuriatno,

Ardhenta

et al. 2023

EEJET

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This paper explores some efforts to suppress the voltage surge appearing during the operation of a SiC-MOSFET-based half-bridge circuit in an inverter topology. The study is important to carry out, as the voltage surge problem does not come up when a Si-IGBT is used as the switching component in the half-bridge; however, some applications demand certain properties like what is found in a SiC MOSFET. Compared to Si-IGBT with rise-time/fall-time larger than 100 ns in general, the use of SiC MOSFET is preferable due to its much shorter switching time, less than 50 ns, which brings about a much lower switching loss and lower operating temperature. However, the choice of the usual electrolytic capacitor in the dc-link would produce an undesired voltage surge during the half-bridge operation. The origin of the surge is sometimes assigned to the inductance parasitic effect of the SiC-MOSFET high frequency. This research proves the benefit of a film capacitor to suppress the surge due to its lower equivalent series resistance (ESR) than that of the electrolytic capacitor. The results contribute to the consideration to take during the circuit realization in various applications, as there are not many papers yet found discussing the use of film capacitor in the dc-link of a SiC-MOSFET half-bridge inverter. This study also reveals the importance of the film capacitor placement during the design stage of SiC-MOSFET applications; moreover, motor controllers being equipped with an inverter such as described in this study have not been found yet in the market. The efforts investigated in this work would help to control the undesirable voltage spikes that frequently occur when applying a SiC-MOSFET to a half-bridge inverter design

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

Capacitor for the voltage-surge suppression in a SiC-MOSFET half-bridge inverter

Hasanah,

Djuriatno,

Ardhenta

et al. 2023

EEJET

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“…Several STPI ride-through improvement alternatives incorporating energy storage are available to provide the required additional dc-link power. These include either ordinary or super-capacitors, battery based back-up systems, flywheel based energy storage, motor-generator sets, storage based on super conducting magnetic energy and fuel cells [14,[17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…Most VSDs are equipped with an electrolytic capacitor on the dc-link. This capacitor is used primarily for filtering the dc-link voltage, providing limited energy storage for a VSD to ride-through minor voltage dips and providing a low impedance path for high frequency inverter currents [19]. Typical capacitance values are between 75-360 µF/kW [15].…”

Section: Introductionmentioning

confidence: 99%

Variable Speed Drive DC-Bus Voltage Dip Proofing

Chiranga

Masisi

2021

Energies

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This paper proposes a power electronic module that uses a switched capacitor for retaining the integrity of the dc-link voltage of a variable speed drive (VSD) during a 0.2 s short-term power interruption (STPI). Ride-through was achieved through switched capacitor onto the dc bus. However, this technique presents a challenge of the high inrush currents during a ride through compensation. In this work both analytical and experimental investigations were conducted in order to reduce the in-rush currents and its impact on the performance of the VSD during the STPI. Inrush peak currents were reduced by approximately 90%. Experimental results showed torque pulsations of 12.8% and 14.3% at the start and end of dc-link voltage compensation, respectively. A method for sizing the switched capacitor and the inrush limiting resistors is proposed. This methodology is based on the use of readily available nameplate information of the VSD and the electric motor. The proposed module can be retrofitted to existing VSDs that are based on v/f control.

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