About High inductor temperature of photovoltaic inverter
This reference design implements single-phase inverter (DC/AC) control using a C2000TM microcontroller (MCU). The design supports two modes of operation for the inverter: a voltage source mode using an output LC filter, and a grid connected mode with an output LCL filter.
This reference design implements single-phase inverter (DC/AC) control using a C2000TM microcontroller (MCU). The design supports two modes of operation for the inverter: a voltage source mode using an output LC filter, and a grid connected mode with an output LCL filter.
The proposed inverter combines a high-gain boost converter with coupling inductor and a full-bridge unfolding circuit. When the instantaneous output voltage is higher than the input voltage, the high-gain boost converter is controlled by sinusoidal pulse-width modulation (SPWM), and the full-bridge unfolding circuit is only used for switching .
To increase the high temperature reliability of PV inverters, Mahshid Amirabadi proposed converter a single stage power conversion system with zero voltage turn on and soft turn off of the switches. This converter was formed by a parallel ac inductor/capacitor (LC) pair having low reactive ratings.
In this paper the attention is focused on the temperature range of a DMPPT converter inductor and on the variation of its parameters caused by the thermal factor action. In Fig. 7, a 47uH inductor temperature values in correspondence of the identified working points are shown.
High reliability is another key design requirement in PV inverters. The temperature of the hottest component of 4-level flying capacitor operated at 32 kHz inductor current frequency is only 4K higher than the ANPC operated at 16 kHz. Nevertheless, any temperature rise has an effect on module lifetime.
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