The inverter switch is the part that controls the on-off of inverter circuit. It controls the conversion frequency and direction of the transformer, so that the input direct current can be converted into the required AC power output to the load.
To address the power tracking accuracy and dynamic response challenges in three-phase PV inverters, this paper proposes a dual-loop control strategy implemented in the dq rotating reference frame, consisting of an outer power loop and an inner current loop.
The proposed control strategy is based on the use of a phase locked loop to measure the microgrid frequency at the inverter terminals, and to facilitate regulation of the in-verter phase relative to the microgrid.
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Instead, it is a rectifier board / thyristor trigger board / pre-charge control board (TDB board) for SIEMENS MICROMASTER MM430/440 series inverters, responsible for triggering the thyristors (SCR) in the rectifier circuit and controlling the pre-charging process.