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With the rapid increase in the number of electric vehicles, V2G model has been widely concerned. In this paper, the three-level LLC resonant DC/DC converter applied to V2G is chosen as the research object. The charging process of the circuit is introduced from the basic principle of the circuit. Afterwards, MATLAB/Simulink is used to simulate and analyze the bifurcation phenomenon. Finally, it controls...
Average-value modeling (AVM) provides an efficient way to study power electronic systems in large- and small-signal senses. This paper presents a new reduced-order AVM for dual-active-bridge dc–dc converters. The proposed model considers the conduction and transformer power losses as well as the input/output filters, which may be very useful for system-level studies. Based on the large-signal AVM,...
A new topology of energy router with multiple isolated HVAC ports is proposed in this paper. The topology is composed of several modular multilevel converters (MMC) and a cascaded multi-active bridge (MAB) converter. With this topology, distribution lines with the same voltage level can be connected together and switched seamlessly, even though the voltage amplitude, phase angle and earthing points...
Based on analyses of common mode (CM) EMI suppression methods for switching converters, a digital active CM EMI suppression technique is present. A push-pull active compensating circuit produces a compensating current with anti-phase relationship to the CM noise current of the converter. Whether driving signals transmission delay of compensating circuit and main bridge are the same or not will impact...
In PWM converters, high dv/dts due to fast switching of the power devices can cause serious common mode electromagnetic interference (CM EMI). Theoretically, a single-phase full-bridge inverter under bipolar SPWM operation should produce very low CM noise because the two phase legs operating in a complementary manner can compensate for each other. However, in practice this ideal scenario will never...
A modified equivalent circuit for common-mode (CM) current of single-phase full-bridge inverters is proposed. The circuit allows application of superposition theorem, and it provides more insights into the propagation mechanism of the CM noise. Simulations and experiments are conducted on an inverter test setup to validate the proposed circuit. Three operation conditions are studied: (1) with one...
Theoretically, a full-bridge converter under bipolar PWM should produce very little common mode noise because the two phase-legs can compensate for each other, but this feature is often disrupted by different transmission delays of the gating signals. In this paper, a method to address this problem through automatic tuning of the pulse edges of gating signals is proposed. Specifically, the CM noise...
Theoretically, a full-bridge converter under bipolar PWM should produce very little common mode noise because the two phase-legs can compensate for each other, but this feature is often disrupted by different transmission delays of the gating signals. In this paper, a method to address this problem through automatic tuning of the pulse edges of gating signals is proposed. Specifically, the CM noise...
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