Abstract
An LCL capacitor current compensation and control method based on Division and Summation technique, comprising the following steps: calculate the new reference current i ＊ lr= grid reference current (Igr) + evaluated capacitor current () ; calculate the duty cycle ratio (d) for each of the switches in the inverter, by means of the corresponding division and summation control characteristic equations (A), (B),(C),(D), based on the inverter code for different types of inverter systems, to obtain inductor current (il); calculate grid current (ig) = inductor current (il) - capacitor current (iC); calculate the grid side voltage across the inductor (vc-vp) = grid side inductor impedance (Zg) x grid current (ig); use equation 4 to calculate voltage across the capacitor (vc); evaluate the capacitor current () = voltage across capacitor (vc) / impedance of filter capacitor (Zc); and use equation 3 to calculate capacitor current ().