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.
It supports whole-home or dedicated load backup, integrates with lithium-ion batteries, and delivers up to 11. 4kW of continuous power with split-phase output and rapid switchover for uninterrupted energy supply.
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These inverters use the pulse-width modification method: switching currents at high frequency, and for variable periods of time. For example, very narrow (short) pulses simulate a low voltage situation, and wide (long pulses) simulate high voltage.
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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.