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Voltage deviations of dc-link capacitors are the main problem of multilevel diode-clamped converters (DCC). In this paper, a novel carrier-based voltage balance method is proposed to balance the dc-link capacitors of five-level DCCs. The proposed method is characterized by injecting proper zero-sequence voltages in the modulation signals of carrier-based modulators. The effects of the injected zero-sequence...
This paper discusses the dead-time effect of dual bridge series resonant DC/DC converter (DBSRC). The phase-shift modulation is usually adopted in DBSRC. However, the phase-shift angle is usually small, and voltage polarity reversal (VPR) may occur in dead-time, which may deteriorate EMI/EMC and increase loss. This paper analyzes the commutation of DBSRC when VPR occurs and proposes a method to eliminate...
In order to eliminate the common-mode (CM) leakage current in the transformerless photovoltaic (PV) systems, the concept of the virtual dc bus is proposed in this paper. By connecting the grid neutral line directly to the negative pole of the dc bus, the stray capacitance between the PV panels and the ground is bypassed. As a result, the CM ground leakage current can be suppressed completely. Meanwhile,...
Capacitors have long been used on distribution feeders for, among other things, voltage profile management, power factor correction and loss reduction. The basic choice has been: fixed banks; or switched banks with a variety of local controls. Centralized Volt/VAR control allows for “optimal” feeder conditioning for loss reduction and demand reduction. To be effective, both local and centralized control...
In the transformerless photovoltaic (PV) system, the common mode ground leakage current may appear due to the galvanic connection between the PV array and the ground, which causes the safety issues and reduces the efficiency. To solve this problem, a novel inverter topology with switched capacitors is proposed in this paper. By connecting one pole of the PV cell directly to the neutral line of the...
In this paper, a zero voltage transition (ZVT) interleaved high step-up converter with built-in transformer and voltage doubler for photovoltaic (PV) grid-connected generation system is proposed. The built-in transformer and the voltage doubler are employed to extend the voltage gain, reduce the switch voltage stress, which makes the low on-resistance switch can be adopted to reduce the conduction...
A high step-up converter with a coupled inductor and a switched capacitor is proposed in this paper. By using the coupled inductor, the voltage gain of the converter is extended and the voltage stress of the main switch is decreased to reduce the conduction losses. Moreover, the reverse-recovery problem of the output diode is alleviated by the leakage inductance. By using the switched capacitor, the...
A new three dimensional space vector modulation (3D-SVM) strategy in abc coordinates for the three phase four wire converter with split-capacitor is presented. Among various three phase four wire converters, the center split converter is suit to low cost, low power applications for its fewer switches. Compare to the 3D-SVM in alphabetagammacoordinates, the strategy in abc coordinates is more clearly...
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