Three-phase inverter parallel synchronization control

How to synchronize three inverters in a paralleled multi-inverter system?

A Novel Communication Strategy for Decentralized Control of Paralleled Multi-Inverter Systems suggests the method of synchronization of three inverters. For this method, the common mode signal’s circuit in the paralleled system is used as a channel of communication between individual inverters.

How to synchronize inverter parameters with grid system?

Parameters of the inverter such as voltage, frequency and phase can be controlled for the purpose of synchronization with the relevant parameters of the grid system. Synchronization of inverter parameters like voltage, frequency and phase with grid systems can be possible by specific control system with embedded controller.

What is the internal architecture of 3 phase inverter?

The internal architecture of three phase inverter includes Gate driver, Sinusoidal Pulse Width Modulation (SPWM), Phase locked loop (PLL), low pass filter, snubber circuit. As the PLL topology is matched, the synchronization of inverter with grid is virtually realized .

How thipwm can be used in parallel connected inverter?

The application of THIPWM to parallel connected inverter reduces the total harmonic distortion and increases efficiency of the inverter .Power-Synchronization Control of Grid-Connected Voltage-Source Converters represented the novel control method for synchronization.

What is a phase locked loop in an inverter?

Inverter generates three phase sinusoidal voltage and currents. Phase locked loop (PLL) and dq0 transformer This section in the inverter control converts the voltage and currents to per unit values. PLL takes the grid voltage and finds its angle and frequency.

What are the problems with parallel 3p2l inverters?

Another problem is the common-mode voltage (CMV), which causes electromagnetic interference and threatens the safe operation of the system. There exists interconnection between these two issues in the paralleled 3P2L inverters. To suppress the CMV and circulating current simultaneously, an improved control method is presented.