AC/DC/AC PWM converter with reduced energy storage in the DC link

Malesani, L.; Rossetto, L.; Tenti, P.; Tomasin, P.

doi:10.1109/28.370275

Cited by 232 publications

(76 citation statements)

References 8 publications

(7 reference statements)

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“…The selection of the dc capacitor C dc is based on the balance of the energy exchange during the transient period [10], where ΔP max denotes the maximum variation of the output power, T r denotes the control response time -a few modulation period, U dc denotes the dc-link voltage, and ΔU max denotes the maximum voltage variation. The parameters of the 2 MW DFIG system is listed in Table I.…”

Section: Design Of Dc-side and Ac-side Capacitorsmentioning

confidence: 99%

Reliability evaluation of power capacitors in a wind turbine system

Zhou

Blaabjerg

2018

2018 IEEE Applied Power Electronics Conference and Exposition (APEC)

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-With the increasing penetration of wind power, reliable and cost-effective wind energy production is of more and more importance. The doubly-fed induction generator based partial-scale wind power converter is still dominating in the existing wind farms. In this paper, the reliability assessment of power capacitors is studied considering the annual mission profile. According to an electro-thermal stress evaluation, the time-to-failure distribution of both the dc-link capacitor and ac-side filter capacitor is detailed investigated. Aiming for the systemlevel reliability analysis, a reliability block diagram is used to bridge the gap between the Weibull distribution based component-level individual capacitor and the capacitor bank. A case study of a 2 MW wind power converter shows that the lifetime is significantly reduced from the individual capacitor to the capacitor bank. Besides, the dclink capacitor bank dominates the lifetime consumption.

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Section: Design Of Dc-side and Ac-side Capacitorsmentioning

confidence: 99%

Reliability evaluation of power capacitors in a wind turbine system

Zhou

Blaabjerg

2018

2018 IEEE Applied Power Electronics Conference and Exposition (APEC)

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“…Conventional control of AC/DC/AC converters is usually implemented with the load side converter controlling the machine speed and the source side converter controlling the DC-link voltage [24,25]. Load power estimation can be implemented on the load side to balance the power flow between the source and the load, combined with DC-link voltage control [26,27].…”

Section: Overall System Descriptionmentioning

confidence: 99%

“…Differently from other conventional control strategies with DC-link regulator [24][25][26][27], the proposed control strategy uses power estimation to balance the power flow in the flywheel-wheel link. Therefore, only current controllers are required, eliminating the need for the outer loops and voltage/speed controllers.…”

Section: Invertermentioning

confidence: 99%

Power Balance Control in an AC/DC/AC Converter for Regenerative Braking in a Two-Voltage-Level Flywheel-Based Driveline

Oliveira

Lundin

Bernhoff

2011

International Journal of Vehicular Technology

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The integration of a flywheel as a power handling can increase the energy storage capacity and reduce the number of battery charge/discharge cycles. Furthermore, the ability of recovering energy of the vehicle during breaking can increase the system efficiency. The flywheel-based all-electric driveline investigated here has its novelty in the use of a double-wound flywheel motor/generator, which divides the system in two different voltage levels, enhancing the efficiency of the electric driveline. The connection of two AC electrical machines (i.e., the flywheel and the wheel motor) with different and variable operation frequency is challenging. A power matching control applied to an AC/DC/AC converter has been implemented. The AC/DC/AC converter regenerates the electric power converted during braking to the flywheel machine, used here as power handling device. By controlling the power balance, the same hardware can be used for acceleration and braking, providing the reduction of harmonics and robust response. A simulation of the complete system during braking mode has been performed both in Matlab and Simulink, and their results have been compared. The functionality of the proposed control has been shown and discussed, with full regeneration achieved. A round-trip efficiency (wheel to wheel) higher than 80% has been obtained.

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“…Um conversor eletrônico de potência que tem recebido atenção devido ao fato de ser uma alternativa ao inversor de frequência fonte de tensão com banco de capacitores no elo de corrente contínuaé o conversor indireto ca/cc/ca (Malesani et al, 1995) que consiste de um retificador-inversor PWM com um banco de capacitores do elo de corrente contínua com reduzida capacitância. Neste caso, o capacitor eletrolíticoé substituído por um capacitor não eletrolítico com capacitância muito menor e com esta substituição, a distorção harmônica total da corrente de entradaé reduzida drásticamente e a confiança no conversoré aumentada.…”

Section: Introductionunclassified

Um controlador de corrente de carga para o conversor em matriz trifásico para trifásico e para o inversor de frequência sem capacitor do elo de corrente contínua

Filho

Gazoli

et al. 2010

Sba Controle & Automação

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A Controller for the Three-Phase to Three-Phase Matrix Converter and for the Voltage Source ThreePhase Inverter Without DC-Link CapacitorVoltage source three-phase inverter plays an important role in modern industry. The conventional voltage source inverter has a large electrolytic capacitor as energy store element in order to keep the DC-link voltage constant. However, a large electrolytic capacitor increases the input current distortion. Replacing the large electrolytic capacitor by a small film capacitor, the input current quality is improved but the DC-link voltage and the output currents are distorted by low order harmonic components.The three phase to three phase matrix converter performs electric energy direct transfer from the input to the output with sinusoidal input current although the distortion and the unbalance of the input voltages affects directly the output of the matrix converter. This paper proposes a load current control method to the matrix converter and also to the voltage source inverter in absence of the dc-link capacitor in order to compensate the distortion caused by low order harmonics components in the output currents. The proposed load current control scheme employs just one PI controller and since that the space vector modulation is used in this control, the switching frequency of the converter is kept constant. Theorical foundation, simulations results and experimental results are presented.

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AC/DC/AC PWM converter with reduced energy storage in the DC link

Cited by 232 publications

References 8 publications

Reliability evaluation of power capacitors in a wind turbine system

Reliability evaluation of power capacitors in a wind turbine system

Power Balance Control in an AC/DC/AC Converter for Regenerative Braking in a Two-Voltage-Level Flywheel-Based Driveline

Um controlador de corrente de carga para o conversor em matriz trifásico para trifásico e para o inversor de frequência sem capacitor do elo de corrente contínua

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