Photovoltaic inverter current matching method

Should grid code regulation be followed when integrating a PV inverter system?

Grid code regulation must be followed when integrating the photovoltaic inverter system to the grid. The paper investigates and analyzes a controller model for grid-connected PV inverters to inject sinusoidal current to the grid with minimum distortion.

Are PV inverters voltage regulated?

In the modern day, the PV inverters are being developed under the interconnection standards such as IEEE 1547, which do not allow for voltage regulations . However, a majority of manufacturers of PV inverters tend to enhance their products with reactive power absorbing or injecting capabilities without exceeding their voltage ratings.

Can a grid-connected PV inverter control overvoltage and undervoltage?

Generally, a grid-connected PV inverter can be programmed to inject and absorb the reactive power. Hence, both the overvoltage and undervoltage conditions can be regulated using the reactive power control ability. The dq components theory, which will be described in Section 2, can be used to perform the controlling mechanism efficiently .

How diversified and multifunctional inverters are used in PV system?

The advanced functionalities can be accomplished by using diversified and multifunctional inverters in the PV system. Inverters can either be connected in shunt or series to the utility grid. The series connected inverters are employed for compensating the asymmetries of the non-linear loads or the grid by injecting the negative sequence voltage.

Which controller is used in PV inverter?

Another controller used is low-pass filter in the feedback path along with harmonic compensator to improve the grid current quality [ 7 ]. Proportional resonant (PR) controller is an algorithm used in the current controller which is used to integrate the PV inverter into the grid.

What are the different types of PV inverters?

There are four configurations commercially accepted [26 – 30]. Central-plant inverter: usually a large inverter is used to convert DC output power of the PV array to AC power. In this system, the PV modules are serially string and several strings are connected in parallel to a single dc-bus. A single or a dual-stage inverter can be employed.