Method for controlling photovoltaic inverter under conditions of unbalanced network voltage
A photovoltaic inverter, grid voltage technology, applied in photovoltaic power generation, reactive power compensation, reactive power adjustment/elimination/compensation and other directions
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[0050] In order to make the objects, technical solutions and advantages of the present invention clearer, the following will be combined with the appendix figure 1 , 2 , 3, 4, 5, and describe them in detail.
[0051] Step 1: Design of the photovoltaic system.
[0052] A photovoltaic grid-connected system usually consists of photovoltaic arrays, photovoltaic inverters, filters and main grids, such as figure 1 shown. In the present invention, the photovoltaic array adopts the 5-parameter photovoltaic cell model proposed by the US SEL Laboratory (Solar Energy Laboratory) to build the photovoltaic array model, and the battery model adopts the equivalent physical and mathematical model of the photovoltaic cell single diode to evaluate the output performance of the photovoltaic array. . like figure 2As shown in the figure, the equivalent circuit of the battery model is a current source in parallel with a reverse diode and an equivalent parallel resistor, and then an equivalent...
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