72v inverter loss rate

The power losses in a voltage source inverter (VSI) are the sum of the additional constant power losses of the local power supply, the inverter circuits as well as the main power conversion losses.

Losses in two-level inverters have been reported extensively in the literature. Researchers have also investigated semiconductor losses in three-level inverters. Estimates of switching losses have been obtained using approximations of IGBT and diode I-V switching characteristics [1, 4, 17, 18].

Up to a certain point in time, the entire lifetime of a PV inverter was predicted based on the failure rates of individual components and handbooks provided by the manufacturers. In recent years, the prediction of the reliability and lifetime of power converters has been done through physics-of-failure assessments.

, . The inverter outages contribute to 36% of the energy losses among the total outages . The significant percentage of operation and maintenance and energy loss necessitates understanding the failure mechanisms of various components in the inverter or any other power conversion equipment .

The process of selecting the topology, components and operating parameters (voltage, current and switching frequency) of an inverter is highly affected by the anticipated inverter losses. An accurate estimate of the losses occurring in each part of an inverter can significantly contribute to achieving an enhanced inverter design.

This paper examines the semiconductor and DC-link capacitor losses of four voltage source inverter topologies: the conventional two-level inverter, the two-level two-channel interleaved inverter, the three-level Neutral-Point-Clamped (NPC) inverter and the three-level Cascaded H-Bridge inverter, shown in Figure 1.