Network source coordination power control method of isolated photovoltaic direct current microgrid

The present invention discloses a network source coordination power control method of an isolated photovoltaic direct current microgrid. The network source coordination control is realized through adoption of each current transformer and multi-source regulation potential in a system. A storage battery side employs a constant direct current voltage control, and the power vacancy of the photovoltaic direct current microgrid is compensated through charging and discharging; when the direct current of the photovoltaic direct current microgrid is fluctuated (|[Delta]Udc|>=0.02pu), the storage battery side is switched from the constant direct current voltage control to a direct current voltage-active power droop control and controls the operation of the microgrid. When the load is too large to lead to the SOC of the storage battery is not larger than 40% or IB>=IBmax, a convertor station L-VSC at the load side is switched from the constant power control to the active power-direct current voltage droop control, and the direct current voltage is prevented from dropping through changing the load characteristics. When the load too small to lead to the SOC of the storage battery is not less than 80%, a photovoltaic power generation system is switched from a maximum power tracking mode to a droop control mode to ensure the balance of the system power, avoid surplus direct current network power and enhance the bearing capability of the system for the active disturbance.