The invention discloses a direct current micronet system control method and system, comprising: obtaining a local direct current voltage, and a generating port comparing the local direct current voltage with a first predetermined voltage; controlling the generating port through a unidirectional anti-saturation voltage control algorithm when the local direct current voltage is no less than the first predetermined voltage, and controlling the generating port to be in a predetermined state when the local direct current voltage is less than the predetermined voltage; an energy storage port comparing the local direct current voltage with a second predetermined voltage and a third predetermined voltage; controlling the energy storage port through a unidirectional proportion voltage control algorithm when the local direct current voltage is no less than the second predetermined voltage, controlling the energy storage port to be in a unidirectional proportion voltage control state when the local direct current voltage is no greater than the third predetermined voltage, and controlling the energy storage port to be in a power port state when the local direct current voltage is between the second predetermined voltage and the third predetermined voltage; and a grid connection port detecting in real time the three phase voltage amplitude and frequency of an alternating current side, and controlling the grid connection port through a bidirectional deviation-free voltage algorithm when the amplitude and frequency are stable. The direct current micronet system control method and system can respond rapidly and have high reliability.