Technical FAQs 4

Why is phase lag a problem in grid-connected inverters?

The control of grid-connected inverters is recently executed with digital microprocessors due to the advances in digital signal processing technology. However, the digital realisation has a drawback of the phase lag induced by the time-delay. This phase lag challenges the stability and robustness of the controller of the inverters.

How to achieve a phase boost in an inverter?

They can be realized by the narrowband digital filtering technique , compensator added in feedforward voltages and currents , , , , and the power controller with a high pass filter . The results show that the phase response of the inverter impedance has a phase lead (phase boost).

Is there a delay compensator for single-phase LCL-type grid-connected inverters?

Developed a straightforward and readily applicable delay compensator for single-phase LCL-type grid-connected inverters operating under digital control. Demonstrated that the proposed delay compensator guarantees the system’s resonant frequency always resides in the positive resistance region, even with varying Lg values.

Does inverter impedance have a phase lead (phase boost)?

The results show that the phase response of the inverter impedance has a phase lead (phase boost). A feedforward method is able to eliminate the negative damping of inverter impedance in a wide frequency range .

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Solar inverter delay phase advance capability

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