The invention discloses a DC power distribution network voltage ripple elimination system and method free of optimal computation. The DC power distribution network voltage ripple elimination system comprises a central controller, a communication channel and a voltage detection device, wherein various periodical loads of a DC power distribution network take electricity from the DC power distribution network through convertors respectively; the central controller communicates with the converters which are connected with the periodical loads through the communication channel respectively; and the voltage detection device is arranged in the central controller and is used for detecting a DC voltage. The DC power distribution network voltage ripple elimination system and method have the beneficial effects that voltage fluctuation in a DC micro-grid system can be reduced; and the stability and the safety of the DC micro-grid system can be improved.