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Photovoltaic inverter inductor power calculation

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Photovoltaic inverter inductor power calculation [PDF]

6 FAQs about [Photovoltaic inverter inductor power calculation]

How does a photovoltaic inverter work?

Power generation flowing through the transmission line causes unintended flow of reactive power to the grid side, as the transmission reactance consumes reactive power. Thus, the grid-side reactive power becomes coupled with the active power production of the photovoltaic inverter, which fluctuates along with irradiance conditions.

What is the best coupled inductance for PV inverters?

The best coupled inductance can then be determined by observing the minimum power loss from Pc (EUR). It is observed from Figs. 6a and b that the best coupled inductances for 1.5 and 2.5 kW PV inverters are 3.58 and 2.92 mH, respectively.

What happens if an inverter does not have a grid inductance scheme?

Without the scheme, the inverter operates at unity power factor by default and reactive power drawn from the grid increases based on the grid inductance. During the lowest SCR of the grid, 600 kVAr of unintended reactive power is drawn from the grid without compensation (60% of active power feed).

Can a photovoltaic inverter compensate unintended reactive power?

The present work proposes a method for real-time compensation of the unintended reactive power, which decouples the reactive power from the active power of a photovoltaic inverter. Based on real-time measurement of the grid impedance, the unintended reactive power is estimated and autonomously compensated in the inverter.

What happens if a PV inverter has a weak grid?

Thus, in a weak grid the active power of a PV inverter becomes coupled with reactive power seen by the grid. Unintended reactive power increases transmission losses, reduces the maximum transmission capacity, compromises system stability, and strains the grid with excessive reactive power requirements , , , , .

How does reactive power affect a PV inverter?

The flow of reactive power in the transmission line increases the total current and Joule losses in the line. In addition, a large proportion of unintended reactive power may destabilize the inverter in very weak grids. Consequently, the unintended reactive power imposes limitations to maximum active power feed from the PV inverter.

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