Control power supply of pitch system of wind driven generator

Abstract

The invention discloses a control power supply of a pitch system of a wind driven generator, which comprises an Alternating Current (AC) / Direct Current (DC) power supply module. An input of the AC / DC power supply module is given by an Uninterrupted Power Supply (UPS); the AC / DC power supply module is connected with a Programmable Logic Controller (PLC) for monitoring a work state of the AC / DC power supply module; when the work state of the AC / DC power supply module is abnormal, the PLC feeds monitoring information back to a master control system of the wind driven generator, and the master control system controls the pitch system to stop; the control power supply further comprises a DC / DC power supply module; an input of the DC / DC power supply module is given by a super capacitor of the pitch system; an output end of the DC / DC power supply module is connected with an output end of the AC / DC power supply module through diode high-selection circuits; an output voltage of the AC / DC power supply module in a powered-up state is always greater than an output voltage of the DC / DC power supply module; the output voltage of the DC / DC power supply module and the output voltage of the AC / DC power supply module are subjected to high selection by the diode high-selection circuits, and then transmitted to the pitch system. The control power supply of the pitch system of the wind driven generator forms a redundant design, is steady and reliable, and high in safety.

Description

technical field [0001] The invention relates to a wind power generator pitch system, in particular to a control power supply for the wind power generator pitch system. Background technique [0002] The pitch system is the key link to ensure the overall safety of the wind turbine. During the working process, the wind turbine adjusts the power by adjusting the blade angle of the pitch system to keep the output power of the engine stable. [0003] see figure 1 : The control loop power supply of the existing wind turbine pitch system includes an AC / DC power module. The input of the AC / DC power module is given 230VAC by the tower base UPS power supply of the wind turbine through the slip ring, and the AC / DC power module converts the 230VAC The output terminal of the AC / DC power supply module transmits 24VDC to the pitch control system. The contacts 13 and 14 of the relay 1.1 in the AC / DC power supply module are connected to the I / O terminals of the PLC controller. It is used to...

AI Technical Summary

Problems solved by technology

However, since the control loop power supply of the pitch system depends on the only UPS power supply, and there is no other backup power supply, once the tower base UPS power supply or slip ring of the wind turbine, and the AC / DC power module fail, the pitch system will lose the control loop Power supply, at this time, the controller, servo driver, supercapacitor voltage monitoring module and other auxiliary control relays of the pitch system are all powered off, and the pitch system is out of control. After the PLC controller feeds back the monitoring information to the main control system , the main control system controls the emergency shutdown of the pitch system. This emergency shutdown operation has a serious impact on the main shaft brake and tower of the wind turbine, directly threatening the safety of the entire wind turbine.

Images