L-capacitance-L (LCL)-filtering-based controlled rectifier parameter identification method
A parameter identification and filter technology, which is applied in the field of controllable rectifier parameter identification based on LCL filtering, can solve problems such as inaccurate system orientation, start-up out of control, too many controllable rectifier sensors, etc., and achieve the effect of accurate observation and smooth start-up
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[0040] Embodiment 1: The controllable rectifier parameter identification method based on LCL filtering includes five steps: 1. Acquisition process of short-circuit current; 2. Parameter identification based on genetic algorithm; 3. Acquisition of the initial phase angle of the power grid at startup ; 4. The real-time estimation of the virtual flux linkage value of the power grid under the LCL filter condition; 5. The acquisition of the system orientation angle under the LCL filter condition; the specific steps are as follows:
[0041] Step 1. The process of obtaining the short-circuit current is as follows:
[0042] Step 1.1. Sampling the DC bus voltage. At this time, the power device in the controllable rectifier does not work, and the power diode connected in parallel with the power device rectifies the AC voltage of the grid to the DC bus voltage, which is the voltage obtained by uncontrollable rectification;
[0043] Step 1.2, send a zero-vector signal (0, 0, 0...
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