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This paper presents a detailed power loss model for a microinverter with three different zero voltage switching boundary conduction mode (BCM) current modulation methods. The model is used to calculate the optimum peak current boundaries for each modulation method. Based on the power loss model, a dual-zone modulation method is proposed to further improve the microinverter efficiency. The proposed...
This paper highlights the power limited nature of the Distributed Generation inverter and demonstrates the practical way to integrate them into the microgrid. Since the energy source of Distributed Generation inverters is power limited in nature, they constrain the operation of inverters to which they are coupled. If the power demanded from these inverters is beyond their capability, their DC-link...
To improve light load efficiency, a three-phase photovoltaic (PV) based microinverter may operate in single-phase, two-phase or three-phase mode depending on the available input power. Therefore, its DC link capacitor may be subjected to large peak-to-peak voltage ripple when operating in phase skipping mode. This paper determines the minimum value of the DC link capacitor by allowing the maximum...
This paper investigates the effect of circuit component nonlinearities on dead time optimization for a three-phase microinverter with a peak current mode zero voltage switching (ZVS) output stage. The primary nonlinearities are those associated with MOSFET and other switching devices parasitic capacitance which may vary significantly as a function of the device operating voltage. In addition, filter...
This paper presents a detailed power loss model for a microinverter with three different zero voltage switching (ZVS) boundary conduction mode (BCM) current modulation methods. The model is used to calculate the optimum peak current boundaries for each modulation method. Based on the power loss model, a dual-zone modulation method is proposed to further improve the microinverter efficiency. The proposed...
This paper introduces two efficiency improvement techniques for a grid-tied micro-inverter with current mode control zero voltage switching (ZVS) output stages. The first technique is dynamic dead time optimization wherein PWM dead times are dynamically adjusted as a function of load current. The second method is advanced phase-skipping control which distributes power on individual phases depending...
In the three-phase micro-inverter developed at the Florida Power Electronic Center (FPEC), maximum efficiency is achieved when it is operating at close to its rated power. At lower power, load independent loss becomes a larger part of the overall loss and negatively impacts efficiency. It is therefore advantageous to operate each phase as close to its rated power as possible. One way to accomplish...
Fault section identification in distribution networks is a complicated and important subject. This paper presents a method to distinguish the faulted section with the aid of traveling waves. The proposed algorithm is able to detect the faulty section using voltage signals only and avoid the need for installing current transformers. Fault direction identification method proposed in this paper is based...
Fault section identification in distribution networks is a complicated and important subject. This paper presents a method to distinguish the faulted section with the aid of traveling waves. The proposed algorithm is able to detect the faulty section using voltage signals only and avoid the need for installing current transformers. Fault direction identification method proposed in this paper is based...
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