Three-level four-leg active filter compensation distribution network neutral current control method
A neutral line current, source filter technology, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, etc., can solve neutral line overcurrent, fast control system response, unbalanced load, etc. problems, to achieve the effect of improving reliability and realizing fast current tracking control
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[0029] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0030] like figure 1 , the present invention provides a control method for compensating the neutral wire current of a distribution network with a three-level four-arm active filter, and the control method includes the following steps:
[0031] Step 1: The DC voltage stabilization control module outputs the DC side voltage regulation signal Δi d , superimposed on the instantaneous active current DC component of the compensation current extraction module , to complete the stable control of the DC side voltage;
[0032] Step 2: The DC side voltage balance control module outputs the DC side capacitor balance adjustment signal Δi d * , superimposed on the three-phase voltage signal V output by the current inner loop control module a_ref , V b_ref , V c_ref On, get the three-phase modulation signal V aref , V bref , V cref , to complete the balanced cont...
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