Hard-wire constructed safety protection device of wind generating set

Abstract

The invention relates to a hard-wire constructed safety protection device of a wind generating set. According to the technical solution, the safety protection device is mainly composed of a first safety relay and a second safety relay, and input, output and reset of the safety protection device completely depend on hard wires to be connected to the two safety relays special for safety loops in a cabin cabinet so that the whole safety protection device is divided into two levels, the function and a control loop of the safety protection device are completely separated from a programmable logic controller (PLC) control system, safety of a unit can be still guaranteed in the condition of dead halt of a PLC, communication interruption or failure to normally operate, and the safety protection device has a fail-safe function; signals from each input contact and each output contact of the safety protection device are simultaneously input into the PLC in a mode of independent switching value digital signals, so that fault points of the unit can be conveniently diagnosed, requirements for PLC factories and types are absent, and the universality is high; only the two safety relays, signal cables and a plurality of auxiliary contacts are added, and the advantage of low costs is achieved.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to a safety protection device for a wind power generating set constructed by hard wiring. Background technique [0002] Wind energy has become the renewable clean energy with the most mature technology and the most conditions for large-scale development. The wind turbine is a set of automatic adjustment and unattended fully automatic equipment, but because of its generally harsh environment, it may appear overspeed during operation, the twisted cable reaches the limit position, the vibration is too large, the control system Unexpected crashes, extreme abnormality of grid power, etc., will always threaten the safety of equipment and personnel, so it is very important to protect the safety of running wind turbines. [0003] The protection devices of existing wind turbines basically have the following two structural forms. One is to install a safety processin...

AI Technical Summary

Problems solved by technology

The wind turbine is a set of automatic adjustment and unattended fully automatic equipment, but because of its generally harsh environment, it may appear overspeed during operation, the twisted cable reaches the limit position, the vibration is too large, the control system Unexpected crashes, extreme abnormality of grid power, etc., will always threaten the safety of equipment and personnel, so it is very important to protect the safety of running wind turbines

[0003] The protection devices of existing wind turbines basically have the following two structural forms. One is to install a safety processing module in the tower base and the nacelle, which can perform logic operations inside, and then output control signals through the operation and judgment of the input contacts. This structure generally uses software to make safety logic, and its reliability is not as high as that of hard wiring. The input points are not reliably classified and sorted according to the type and importance of the signal, and the important contacts are generally not designed for redundancy.

In addition, the structure of this protection device roughly has two forms: 1) The safety processing module cannot be completely independent of the PLC controller, or even some independent computing modules of the PLC, and its power supply and communication still depend on the PLC. When the communication link fails, both the protection of the control system and the protection of the protection device will be lost. This kind of structure has poor versatility. To replace the PLC, it is necessary to redesign the safety protection device at the same time, and the cost is relatively high; 2) Independent PLC security Processing module, but such a module needs to increase the communication link separately, and the cost will be higher

[0004] Another structural form is to connect the state information of each protection normally closed contact to the main control PLC, and the main control PLC issues an emergency stop command for the unit. This structural form has the following problems: 1) If the PLC crashes unexpectedly, the The trigger state cannot be guaranteed, and the safety system will be completely out of control, making the unit in a very dangerous state; 2) This structure also has the disadvantage of low reliability, and the input points cannot be reliably classified and sorted according to the type and importance of the signal. Important contacts are generally not designed for redundancy; 3) This design does not comply with relevant industry and national standards, and does not separate the safety system from the control system. If any failure occurs in the relevant modules of the PLC, the safety system will fail

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