Method and device for dynamic inactive compensation control of photovoltaic grid-connected inverter
A photovoltaic inverter, compensation control technology, applied in reactive power compensation, reactive power adjustment/elimination/compensation, photovoltaic power generation, etc. The effect of compensating the phenomenon and improving the operation speed
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[0029] like figure 2 As shown, a dynamic reactive power compensation control method for photovoltaic grid-connected inverters, the sensor detects the effective value of the three-phase voltage of the power grid in real time, and calculates and analyzes the change degree of the effective value of the three-phase voltage of the power grid through PID control, and the three-phase voltage The minimum value is used as the control quantity to detect the state of the grid voltage; when the grid voltage drops, the grid voltage effective value drop rate y and the grid voltage drop speed V are calculated;
[0030] y=(Un-U) / Un
[0031] V=(U-Uhi) / Ts
[0032] Where Un is the effective value of the grid rated voltage, U is the current effective value of the grid voltage, Uhi is the effective value of the grid voltage at the last sampling time, and Ts is the sampling period;
[0033] Input the two control quantities of grid voltage RMS drop rate y and grid voltage drop speed V into the DS...
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