Inverter Inrush Current Protection
A common failure of inverters is overloading the inverter due to inrush current. This is due to the fact that most inverters are designed with a minimum amount of resistance to increase their
Current limiters in power electronics inverters are essential for a specific reason: the limiter must protect the device against thermal hardware damage caused by sourcing excessive output currents. This is the primary objective of current limiting.
Also note that, equipped with an integrator antiwindup, the inverter can still remain in current limiting after the fault clearing due to latch-up, resulting from the primary controller behavior (see Section V-A), which prevents the inverter from a successful fault recovery .
Note that the NTC Inrush Current Limiter does not interfere with the efficiency of the inverter since the relay is also protected from the inrush current by the thermistor. The thermistor will conduct through the relay with 99.2% efficiency loss of current. As shown in Figure 3, choose Ametherm P/N: MS3220008 x 2 to provide 40Ω, 10 AMP, 500 Joules.
These devices regulate the flow of electrical current, ensuring it remains within safe operational limits. There are three main approaches to current limiting in GFM inverters: direct, indirect, and hybrid methods. These current limiters can be implemented at different stages, as shown in Fig. 2.
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