A low-voltage ride-through control method suitable for grid-connected inverters
A low-voltage ride-through and control method technology, applied in the field of inverters, can solve problems such as large current shocks, inverter three-phase current imbalance, aggravating faults, etc., and achieve the effect of suppressing current shocks
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[0046] figure 1 It is a schematic diagram of the low voltage ride through control method applicable to grid-connected inverters of the present invention.
[0047] figure 2 yes figure 1 The schematic block diagram of the drop depth judger based on the dual synchronous coordinate system decoupled phase-locked loop (DDSRF-PLL) is shown
[0048] In this example, if figure 1 As shown, the present invention is a low-voltage ride-through control method suitable for grid-connected inverters, including the following steps:
[0049] 1) Collect voltage and current signals of the power grid and DC side voltage signals; collect voltage and current signals of the grid-connected inverter through the high-precision external AD sampling chip of the controller in the grid-connected inverter, and convert the collected grid voltage , the current signal and the voltage signal on the DC side are transmitted to the digital signal processor DSP;
[0050] 2), the digital signal processor DSP use...
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