Oscillator of photovoltaic inverter

How do inverters synchronize virtual oscillators?

The intrinsic electrical cou-pling between inverters is leveraged to synchronize virtual oscil-lators, hence realizing a control strategy that promotes dynamic load sharing with minimal frequency/voltage deviations.

How are inverters programmed to emulate a nonlinear OS-cillator?

The output of each inverter is programmed to emulate the dynamics of a nonlinear os-cillator. The virtual oscillators within each controller are implicitly coupled through the physical electrical network.

What is oscillator based control?

The controllers only require lo-cal measurements available at the ac terminals; communication between inverters is not necessary. Oscillator-based control is applied toward the design of a three-phase microgrid with high PV penetration.

How does a virtual oscillator work?

The virtual oscillator uses a control logic that measures inverter output filter inductor current with the output being used to generate the pulse-width-modulation signals. A negative damping resistor and a resonant circuit set the system frequency and a non linear cubic voltage-dependent source sustains oscillation.

Which virtual oscillator controller is used in all three inverters?

The virtual-oscillator controller that has been depicted in Fig. 3 is employed in all three inverters. For the PV-interfaced inverter, MPPT is implemented following the approach described in Section IV-B. The parameters of the con-troller and the PV array are summarized in Appendix B.

What is virtual oscillator control (VOC)?

However, recently, inverters are regulated by Virtual Oscillator Control (VOC) to emulate the dynamics of a weakly nonlinear oscillators. In contrast to droop control, VOC is a time‐domain controller that enables interconnected inverters to stabilize arbitrary initial conditions to a synchronized sinusoidal limit cycle rapidly.