Coordination integrated protection method based on distributed power generation grid connected transition operation mode

Abstract

The invention discloses a coordination integrated protection method based on a distributed power generation grid connected transition operation mode, and the method comprises the following steps: S1, preparing an operation condition detection device, a fault detection device, a relay and a controller, enabling the operation condition detection device and the fault detection device to be connected with a grid-connected transformer station, enabling the relay to be connected with the grid-connected transformer station and a high-voltage power grid, and enabling the operation condition detection device, the fault detection device and the relay to be connected with the controller; S2, enabling a low-frequency low-voltage device to be coordinated with a power distribution automatic system, and completing load transfer and island dividing after an accident; S3, carrying out the analysis of operation fault response, achieving the continuous power supply during a load fault, and achieving the corresponding microgrid protection adjustment in an island. The method can monitor the operation condition and fault condition of the grid-connected transformer station in real time, can achieve the continuous power supply during a fault, is simple, is convenient to use, and is low in cost.

Description

technical field [0001] The invention relates to the technical field of distributed power generation grid connection, in particular to a coordinated comprehensive protection method based on distributed power generation grid connection transition operation mode. Background technique [0002] In the early stage of distributed power network construction, due to its uncertain scale and small grid-connected capacity, the short-circuit current provided to the system is limited and has little impact on the protection of existing systems. At this time, it can be regarded as a "pure load" However, when the capacity of distributed power sources continues to increase, grid-connected substations will have the ability to feed relatively high fault currents. At this time, they can no longer be treated as load properties, but at this time the corresponding protection devices on the system side have not followed up , affecting the stable operation of the power grid. [0003] Therefore, it i...

AI Technical Summary

Problems solved by technology

[0002] In the early stage of distributed power network construction, due to its uncertain scale and small grid-connected capacity, the short-circuit current provided to the system is limited and has little impact on the protection of existing systems. At this time, it can be regarded as a "pure load" However, when the capacity of distributed power sources continues to increase, grid-connected substations will have the ability to feed relatively high fault currents. At this time, they can no longer be treated as load properties, but at this time the corresponding protection devices on the system side have not followed up , affecting the stable operation of the power grid