A method for controlling the output voltage of a photovoltaic microgrid inverter
A technology of output voltage control and micro-grid, applied in photovoltaic power generation, conversion of irreversible DC power input to AC power output, output power conversion device, etc., can solve the problem of inconvenient use, high harmonic content, poor stability, etc. problem, achieve good stability, overcome high harmonic content, and good sine degree
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[0026] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.
[0027] The local load is divided into a linear load composed of a resistor R, an inductor L, and a capacitor C, and a nonlinear load composed of a rectifier diode. Photovoltaic inverters under micro-grid conditions mostly use LC filters for output filtering. In the off-grid mode, the outer loop of the controller adopts the output voltage feedback loop, and the inner loop of the controller can adopt two kinds of current feedback control according to the difference of the feedback current: the current of the filter inductor L is collected in real time as the object of the inner loop of the system control, this current Feedback control has a good effect on the voltage ...
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