Method for suppressing and controlling current harmonics of three-phase LCL (Lower Control Limit) type grid-connected inverter
A control method and inverter technology, applied to AC networks to reduce harmonics/ripples, harmonic reduction devices, multi-phase network asymmetry reduction, etc., can solve three-phase grid-connected current unbalance, influence and Grid current phase, grid-connected current distortion and other problems, to achieve the effect of improving grid-connected power factor, suppressing influence, and good quality of grid-connected current waveform
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[0034] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0035] Such as figure 2 As shown, the control method provided by the present invention comprises the following steps:
[0036] (1) Current sensor H using capacitive current respectively i1 and filter inductor L 2 The current sensor H i2 Detection capacitor current i Cx and grid current i L2x , coordinate transformation is carried out after collection, and the capacitive current feedback signal i is obtained C_of_m and grid-connected current feedback signal i L2_of_m ;Using the voltage sensor H v2 Detect grid voltage v gx , coordinate transformation is carried out after collection, and the power grid voltage feed-forward function G g_fd Calculate the grid voltage feed-forward signal v g_fd_m .
[0037] (2) According to the current feedback signal i L2_of_m and its reference signal i ref_m Calculated error signal e 1m , its formula i...
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