A Photovoltaic Low Voltage Ride Through Method Containing Reactive Current Injection
A technology of low-voltage ride-through and current injection, applied in the direction of AC network voltage adjustment, reactive power compensation, electrical components, etc., can solve problems such as grid collapse, grid fault range expansion, and power loss, so as to provide reactive power and help Effect on grid-connected point voltage
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[0012] The present invention will be further described below in conjunction with accompanying drawing. as attached figure 1 Shown, the present invention has several key steps:
[0013] 1) If no voltage drop at the grid-connected point is detected, the photovoltaic inverter will run in grid-connected operation with a power factor of 1; if a voltage drop at the grid-connected point is detected, the degree of voltage drop will be judged.
[0014] 2) If the degree of voltage drop is small (the measured per unit value of the positive sequence voltage of the photovoltaic grid-connected point is greater than or equal to the threshold V ref ), then set the output active power P as P 0 , and according to the active power P 0 And the photovoltaic inverter current constraints to calculate the maximum reactive power Q that can be output max , and set it to Q; otherwise, all photovoltaic grid-connected inverters output reactive power and do not output active power, that is, P=0, Q max...
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