The invention discloses a power distribution network node selection method connected with a distributed wind power generation system, and a power distribution network comprises a plurality of to-be-selected nodes for accessing the distributed wind power generation system, and the method comprises the following steps: establishing a power distribution network simulation model; obtaining short-circuit ratios of a plurality of to-be-selected nodes through the power distribution network simulation model; selecting a to-be-selected node with the short-circuit ratio value greater than a first presetvalue to obtain a plurality of connection nodes; connecting the plurality of connection nodes with a distributed wind power generation system model in sequence, and performing simulation through a power distribution network simulation model; judging whether the voltage simulation values of the plurality of to-be-selected nodes meet a preset voltage change requirement; if yes, connecting the connection nodes with the distributed wind power generation system; and otherwise, adjusting the rated capacity and obtaining the short-circuit ratio of the access node again. On the basis of not changingthe original power distribution network topology line, the distributed wind power generation system is accessed through the optimal site selection access point and the maximum capacity, the system access is reasonably planned, and the safe operation is ensured.

Power distribution network node selection method connected with distributed wind power generation system

The embodiment of the invention provides a wind power plant island microgrid and a grid-connected system. The wind power plant island microgrid comprises non-main power grid power supply equipment, power transformation and transmission equipment, operation parameter monitoring and adjusting equipment and at least one wind generating set which are used for forming the microgrid, wherein the operation parameter monitoring and adjusting equipment comprises a harmonic suppression unit, an adjustment execution unit, an acquisition unit and a communication unit, the non-main power grid power supplyequipment is connected with the power transformation and transmission equipment, the power transformation and transmission equipment is connected with the wind generating sets, and the non-main powergrid power supply equipment is used for providing debugging electric energy for the wind generating sets when the non-main power grid power supply equipment is not connected with a main power grid. The wind power plant island microgrid is advantaged in that the wind generating set can still be debugged, stably operated and the like under the condition that the wind generating set is separated fromthe main power grid.

Wind power plant island microgrid and grid-connected system

The embodiment of the invention discloses an electric energy quality optimization system and an island microgrid. According to the system, a control unit is connected with a standby power supply and an electric energy quality optimization device; the stand-by power supply is used for being connected with a wind generating set system and providing power for the wind generating set system in the debugging stage of the wind generating set system or when an island microgrid is formed by the stand-by power supply and the wind generating set system. The electric energy quality optimization device comprises energy storage equipment connected to the wind generating set system and a voltage, frequency and other stability control device, and the control unit is used for monitoring the frequency of the wind generating set system and controlling the energy storage equipment to discharge to the wind generating set system to improve the frequency when the frequency is smaller than a first frequencythreshold value; and when the frequency is greater than a second frequency threshold, the energy storage equipment receives electric energy from the wind generating set system to reduce the frequency.Electric energy quality can be optimized, and stable operation of the wind generating set system is guaranteed.

Electric energy quality optimization system and island microgrid

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Wind power plant island microgrid and grid-connected system

Electric energy quality optimization system and island microgrid