The invention discloses a multi-end coordination control and
protection system for flexible direct-current power grids. The multi-end coordination control and
protection system has the advantages thata multi-end coordination control device, pole control devices, pole protection devices,
bus protection devices, line protection devices, a direct-current
station control device, an alternating-current
station control device, a
grounding resistance monitoring device, a conversion transformation protection device, an alternating-current energy dissipation device and a safety and stability control device in the multi-end coordination control and
protection system are connected with
control bus, and accordingly data can be shared among the multi-end coordination control device, the pole control devices, the pole protection devices, the
bus protection devices, the line protection devices, the direct-current
station control device, the alternating-current station control device, the
grounding resistance monitoring device, the conversion transformation protection device, the alternating-current energy dissipation device and the safety and stability control device; voltages and power of the integral grids can be controlled by the multi-end coordination control and protection
system, equipment such as
bus, direct-current lines and conversion transformation equipment can be protected in real time, short-time absorbed transient energy can be inputted by the alternating-current energy dissipation device when
new energy cannot be outwardly delivered due to island delivery-end single-pole locking or receiving-end converter station faults in the flexible direct-current power grids, then generator
tripping can be carried out on the
new energy by means of
safety control, and accordingly the problems of overload, power surplus and the like of power grids due to the fact that existing
new energy cannot be outwardly delivered when the existing flexible direct-current power grids are in island operation
modes can be effectively solved by the aid of the multi-end coordination control and protection
system.