Insulation level of photovoltaic inverter
As the heart of the PV plant, the inverter monitors the insulation resistance of the entire system (all PV modules, DC cabling, installation and inverter). As mentioned above, this is particularly important in PV plants without galvanic isolation from the grid, since a single short circuit can lead to personal injury or damage.
As the heart of the PV plant, the inverter monitors the insulation resistance of the entire system (all PV modules, DC cabling, installation and inverter). As mentioned above, this is particularly important in PV plants without galvanic isolation from the grid, since a single short circuit can lead to personal injury or damage.
The IEC62446-1 standard describes two methods for measuring the insulation resistance of a solar PV system. 1. To short the positive and negative electrodes of the PV string, and measure the insulation resistance between the shorting point and earth. 2.
The inverters are further equipped with an array insulation resistance detection circuit, which verifies that the insulation resistance is higher than 600kΩ for single phase inverters and 350kΩ / 700 kΩ / 1MΩ for three phase inverters (value depends on inverter model and local regulation) (and, therefore, the leakage current is lower than .
This paper describes the projects and relevant background needed in developing design qualification standards that would serve to establish a minimum level of reliability, along with a review of photovoltaic inverter quality and safety standards, most of which are in their infancy.
High voltage system in PV inverters operation requires a safe insulation resistance between the PV panel to ground. A poor insulation resistance less than 1MΩ leads to a high leakage current (about 1mA), which not only will damages the system
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