06-09-2017, 10:36 AM
A solar inverter, or inverter or photovoltaic inverter, converts the variable DC output of a photovoltaic (PV) solar panel into an utility frequency (AC) current that can be fed to a commercial or used power grid by a local network, outside the network. It is a critical system equilibrium (BOS) -component in a photovoltaic system, allowing the use of ordinary equipment powered by alternating current. Solar power inverters have special functions adapted for use with photovoltaic matrices, including tracking the maximum power point and anti-islanding protection.
Solar inverters use maximum power point tracking (MPPT) to obtain the maximum possible power of the photovoltaic array. Solar cells have a complex relationship between solar irradiation, temperature and total resistance resulting in a nonlinear output efficiency known as the I-V curve. It is the purpose of the MPPT system to sample the output of the cells and determine a resistance (load) to obtain the maximum power for any given environmental condition.
The fill factor, more commonly known by its abbreviation FF, is a parameter that, together with the open circuit voltage (Voc) and the short circuit current (Isc) of the panel, determines the maximum power of a solar cell. Fill factor is defined as the ratio of the maximum power of the solar cell to the product of Voc and Isc.
There are three main types of MPPT algorithms: disturb and observe, incremental conductance and constant voltage. The first two methods are often referred to as hill climbing methods; are based on the power curve drawn against the voltage that rises to the left of the maximum power point and falls to the right.
Solar inverters use maximum power point tracking (MPPT) to obtain the maximum possible power of the photovoltaic array. Solar cells have a complex relationship between solar irradiation, temperature and total resistance resulting in a nonlinear output efficiency known as the I-V curve. It is the purpose of the MPPT system to sample the output of the cells and determine a resistance (load) to obtain the maximum power for any given environmental condition.
The fill factor, more commonly known by its abbreviation FF, is a parameter that, together with the open circuit voltage (Voc) and the short circuit current (Isc) of the panel, determines the maximum power of a solar cell. Fill factor is defined as the ratio of the maximum power of the solar cell to the product of Voc and Isc.
There are three main types of MPPT algorithms: disturb and observe, incremental conductance and constant voltage. The first two methods are often referred to as hill climbing methods; are based on the power curve drawn against the voltage that rises to the left of the maximum power point and falls to the right.