Photovoltaic inverter zero-crossing detection method

What is zero-crossing detection?

Zero-crossing detection is one of the easiest ways of obtaining grid information like phase by identifying the zero-crossing point of a grid voltages.

Is there a passive method for islanding detection of single-phase grid-connected inverter?

A passive method for detecting islanding in a single-phase grid-connected inverter is proposed. An analog circuit for under/over voltage protection has been developed, ensuring fast detection with no added delay.

What are the current control strategies for single phase grid integrated photovoltaic inverters?

This paper has reviewed the current control strategies for single phase grid integrated photovoltaic inverters. From the above study, it can be concluded that the MPCC scheme shows best steady state performance as compared to other schemes. It also achieves effective harmonic mitigation in terms of reduced THD value of output current.

Which synchronisation technique is used for single phase grid tied inverters?

Some PLL techniques are specially employed for single phase systems such as second-order generalised integrator based PLL (SOGI-PLL) . A new synchronisation technique using multi harmonic decoupling cell (MHDC)-PLL for single phase grid tied inverters is proposed in .

What is a current controller in a photovoltaic inverter?

A current controller is employed to mitigate the harmonics in the current injected into the grid and regulate the power exchange between the plant and the grid. This paper presents a review of the current control strategies implemented for a single phase grid tied photovoltaic inverter.

How to control inverter voltage?

This can be achieved by two methods: one is to control the injected current directly and other is to control the difference in voltage between the inverter output voltage and grid voltage. The voltage control strategies are difficult to realize.