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Single-phase AC/DC or DC/AC systems inherently subject to harmonic disturbance which is caused by the well-known double line frequency ripple power. This issue can be eased through the installation of bulky electrolytic capacitors in the dc-link, but such passive filtering approach may inevitably lead to low power density and limited system lifetime. An alternative approach is to use active power...
With voltage-balancing control, the voltage difference among sub-module (SM) capacitors in a modular multilevel converter can be reduced. However, this comes at the cost of increased device switching frequency. In this paper, the relationship between the switching frequency and SM capacitor unbalanced voltage is investigated. As the relationship depends on the voltage-balancing control schemes, a...
This paper extends the Universal Serial Bus (USB) standard to the contactless domain by combining bidirectional data communication with a capacitive power transfer interface. This work first addresses the power transfer with analysis, simulations, and experiment, based on a secondary side phase feedback series resonant topology. This gives the advantage of simple circuitry to regulate output voltage...
A grid-tie solar inverter with capacitor-supported series voltage compensator for reduction of high-voltage dc-link capacitance is proposed in this paper. The series compensator generates a voltage to counteract the voltage ripple on dc-link capacitor. As the magnitude of the AC voltage ripple is smaller than the dc-link DC voltage, the required voltage-current rating of the compensator is small....
This paper presents a control technique to improve the MPPT performance and grid current quality for two-stage electrolyte-free microinverter. The proposed method rejects the PV-side double-line frequency oscillation and reduces the grid current distortion with the PV dc-dc converter controlled with a high loop gain while intermediate dc bus voltage loop of grid-tie dc-ac inverter controlled with...
Electrolytic capacitors used in photovoltaic (PV) power conditioning units (PCU) for power decoupling purposes are unreliable. Film capacitors can be adopted instead of electrolytic capacitors if the energy storage requirement of the PCU is reduced, since they offer better reliability and have a longer lifetime. The energy storing capacitor size reduction can be facilitated by allowing DC-link voltage...
DC-link voltage control plays a key role for two-stage micro-inverter application. Modeling &analysis of dc-link voltage is investigated in this paper. The first-stage circuit employs transient maximum power point tracking method to realize fast MPP tracking without causing output distortion and dc-link variation. In order to keep dc-link voltage constant, injecting current to grid varies with...
A new solid state variable capacitor (SSVC) with minimum dc capacitance is proposed. A variable ac capacitor (with capacitance variable from 0 to Cac) is traditionally implemented by an H-bridge inverter and a large electrolytic dc capacitor with capacitance of 20 times the ac capacitance value, Cac to absorb the 2ω dc ripple. The proposed SSVC consists of an H-bridge and an additional phase leg connected...
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