Solar Inverter with Active Current Ripple Compensation

In the field of electrical solar power conversion EMC is of topical importance. In common single-phase inverter applications the current of the solar array shows a pronounced ripple. This entails two significant disadvantages: Reduced over-all efficiency due to dynamic maximum power point mismatch and reduced lifetime of the panels due to additional component stress. Furthermore, the output of the solar inverter also shows significant distortions in it’s voltage and current shape. The proposed approach discussed in this paper uses a combined structure of an active filter to fulfil the given requirements: Minimized input current ripple of the cells, string-optimised maximum power point tracking and optimal power quality of the supplying grid.