An islanding protection method for grid-connected photovoltaic systems based on double vector angles
A photovoltaic system, double vector technology, applied in the direction of photovoltaic power generation, emergency protection circuit device, single network parallel feeding arrangement, etc., can solve the problems of active power fluctuation, slow speed, etc., to improve performance, improve output power performance, overcome Effect of active power fluctuations
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[0038] A method for islanding protection of a grid-connected photovoltaic system based on a double-vector angle of the present invention will be further described below in conjunction with the accompanying drawings.
[0039] The principle of the synchronous dq rotating coordinate system in the grid-connected control algorithm of the inverter is as follows: figure 1 As shown, the three-phase photovoltaic inverter control algorithm is based on the integrated grid voltage vector, that is, a The vector angle in the coordinate system is used to express the phase information of the three-phase voltage, and the current vector is the same. Therefore, the zero-crossing point of this angle is not different from the real zero-crossing point in the unidirectional inverter, but only shows that the A phase is the zero-crossing point at this time, and the other two phases are not zero-crossing points. The three-phase alternating current is converted into the direct current in the synchrono...
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