Frequency shift control-based micro grid off-grid energy balance control method

The invention relates to a frequency shift control-based micro grid off-grid energy balance control method. An energy storage converter detects SOC or terminal voltage of a battery in real time, a frequency adjustment coefficient is adaptively changed according to the magnitude of the SOC or terminal voltage of the battery, and according to a formula f=fn+kiP+Ci, an output frequency is changed; according to the size of a system frequency, a distributed power inverter is matched with an MPPT control mode for adjusting self output. The method of the invention does not depend on communication and an integrated control manager, the problem of depending on communication in the prior art is thus solved, and control stability is improved greatly. Through frequency shift adjustment control of the energy storage converter, the distributed power inverter is matched with an MPPT tracking module for adjusting self output automatically according to the size of the system frequency of the micro grid, active power fluctuation in the case of micro grid off-grid operation is stabilized, and micro grid off-grid energy balance is realized; and the construction cost and the debugging cycle of the micro grid can be effectively reduced.