阅读说明：本技术 风电场ssb直流变桨系统的安全变桨方法 (Safe pitch control method of wind power plant SSB direct current pitch control system ) 是由 靖鑫 范晓飞 王彦龙 张志强 朱昊鹏 于 2021-11-12 设计创作，主要内容包括：风电场SSB直流变桨系统的安全变桨方法。现有技术滑环的EFC指令是由风机安全链和主控程序控制,当指令不能有效触发,变桨系统紧急收桨功能无法保证。本发明该方法包括如下步骤：首先是通过对变桨系统进行软件升级及硬件改造的方式,使变桨系统具备独立切断EFC信号的功能,即变桨系统自身在机组出现上述极端异常情况下可自行切断变桨EFC信号,触发紧急顺桨停机功能,进一步提高机组安全,(1)断开中控箱O插头,400VAC电源,电池开关；(2)将电源插座2Xl拆掉,并将2Xl端子使用绝缘胶带包裹后放入线槽；(3)将速度监视器安装在中控箱原2Xl位置,将断电延时时间继电器安装在中控箱；按照要求进行接线。本发明用于风电场SSB直流变桨系统的安全变桨方法。(A safe pitch control method of an SSB direct current pitch control system of a wind power plant. The EFC instruction of the slip ring in the prior art is controlled by a fan safety chain and a master control program, and when the instruction cannot be effectively triggered, the emergency pitch-retracting function of a pitch-changing system cannot be guaranteed. The method comprises the following steps: firstly, the variable pitch system has the function of independently cutting off an EFC signal in a mode of upgrading software and reforming hardware, namely the variable pitch system can automatically cut off the variable pitch EFC signal under the condition that the unit has the extreme abnormity to trigger an emergency feathering shutdown function, so that the unit safety is further improved, (1) an O plug of a central control box, a 400VAC power supply and a battery switch are disconnected; (2) the power socket 2Xl is removed, and the 2Xl terminal is wrapped by an insulating tape and then placed in a wire slot; (3) installing a speed monitor at the original 2Xl position of a central control box, and installing a power-off delay time relay in the central control box; and carrying out wiring according to requirements. The invention relates to a safe pitch control method for an SSB direct current pitch control system of a wind power plant.)

1. A safe pitch control method of a wind power plant SSB direct current pitch control system is characterized by comprising the following steps: the method comprises the following steps:

firstly, the variable pitch system is enabled to have the function of independently cutting off the EFC signal in a mode of upgrading software and reforming hardware of the variable pitch system, namely the variable pitch system can automatically cut off the variable pitch EFC signal under the condition that the unit has the extreme abnormity, an emergency feathering shutdown function is triggered, and the unit safety is further improved;

(1) disconnecting the plug of the central control box O, the 400VAC power supply, the battery switch and the air switches 2Fl, 2F2, 2F8 and 2F9 of the central control box;

(2) the power socket 2Xl is removed, and the 2Xl terminal is wrapped by an insulating tape and then placed in a wire slot;

(3) installing a speed monitor at the original 2Xl position of a central control box, and installing a power-off delay time relay in the central control box; wiring according to requirements, and after checking that the wiring is correct, putting all wire harnesses into a wire slot;

(4) setting parameters of an ema speed monitor and a power-off delay time relay, upgrading an L + B program, disconnecting a circuit breaker 4Fl in a shaft cabinet 2 and a shaft cabinet 3, checking the wiring state of a 4Al power grid voltage detection module of the two-shaft cabinet, and ensuring that the wiring of a 4A1 three-phase incoming line power supply of the two-shaft cabinet is removed and the wiring port is connected to a terminal port;

(5) 1 circuit breaker 4Fl of disconnection axle cabinet, with the original 4Al module of Siemens three-phase multifunctional monitoring relay replacement, the mode of connection is as follows:

A. the 400V input connection mode is the same;

B. dismantling the original module 15 wiring terminal, and putting the module into a wire slot under the protection of an insulating tape;

C. the original module 25 wiring terminal is connected to the Ximen module No. 11 wiring terminal in a modified mode;

D. the original module 18, 28 terminals are switched to the siemens module No. 14 terminals.

(6) After all the air switches and the switches are closed, parameters of the Siemens three-phase multifunctional monitoring relay are set according to requirements;

(7) re-zeroing the variable pitch system;

(8) and after the transformation is completed, the unit is subjected to safety chain test.

Technical Field

The invention relates to the technical field of wind power generation equipment, in particular to a safe pitch control method of a wind power plant SSB direct current pitch control system.

Background

The emergency pitch-collecting design idea of the direct-current pitch-variable system of the wind power plant up to 1.5MW unit is based on the emergency feathering instruction of the slip ring to trigger the battery to directly drive the motor to complete, the EFC instruction of the slip ring in the prior art is controlled by a fan safety chain and a master control program, and when the EFC instruction cannot be effectively triggered, the emergency pitch-collecting function of the pitch-variable system cannot be guaranteed. When emergency shutdown is needed, the variable-pitch EFC can be disconnected through the master control, emergency feathering instructions are given, and emergency feathering shutdown of a variable-pitch system is realized through signals, so that the blades are feathered to a 90-degree safety position, and the safety of the whole machine is ensured.

Disclosure of Invention

The invention aims to provide a safe pitch control method for an SSB direct-current pitch control system of a wind power plant, which is mainly used for solving the problems of low safety, poor reliability and the like of the pitch control system of the wind power plant and additionally arranging a safety chain on the pitch control system of the wind power plant so as to achieve the purpose of improving the operation stability of equipment.

The above purpose is realized by the following technical scheme:

a safe pitch control method of an SSB direct current pitch control system of a wind power plant comprises the following steps:

firstly, the variable pitch system is enabled to have the function of independently cutting off the EFC signal in a mode of upgrading software and reforming hardware of the variable pitch system, namely the variable pitch system can automatically cut off the variable pitch EFC signal under the condition that the unit has the extreme abnormity, an emergency feathering shutdown function is triggered, and the unit safety is further improved;

(1) disconnecting the plug of the central control box O, the 400VAC power supply, the battery switch and the air switches 2Fl, 2F2, 2F8 and 2F9 of the central control box;

(2) the power socket 2Xl is removed, and the 2Xl terminal is wrapped by an insulating tape and then placed in a wire slot;

(3) installing a speed monitor at the original 2Xl position of a central control box, and installing a power-off delay time relay in the central control box; wiring according to requirements, and after checking that the wiring is correct, putting all wire harnesses into a wire slot;

(4) setting parameters of an ema speed monitor and a power-off delay time relay, upgrading an L + B program, disconnecting a circuit breaker 4Fl in a shaft cabinet 2 and a shaft cabinet 3, checking the wiring state of a 4Al power grid voltage detection module of the two-shaft cabinet, and ensuring that the wiring of a 4A1 three-phase incoming line power supply of the two-shaft cabinet is removed and the wiring port is connected to a terminal port;

(5) 1 circuit breaker 4Fl of disconnection axle cabinet, with the original 4Al module of Siemens three-phase multifunctional monitoring relay replacement, the mode of connection is as follows:

A. the 400V input connection mode is the same;

B. dismantling the original module 15 wiring terminal, and putting the module into a wire slot under the protection of an insulating tape;

C. the original module 25 wiring terminal is connected to the Ximen module No. 11 wiring terminal in a modified mode;

D. the original module 18, 28 terminals are switched to the siemens module No. 14 terminals.

(6) After all the air switches and the switches are closed, parameters of the Siemens three-phase multifunctional monitoring relay are set according to requirements;

(7) re-zeroing the variable pitch system;

(8) and after the transformation is completed, the unit is subjected to safety chain test.

Has the advantages that:

1. the invention mainly provides a safe pitch control method for an SSB direct-current pitch control system of a wind power plant, which effectively solves the problems of low safety, poor reliability and the like of the wind power plant pitch control system, and a safety chain is additionally arranged on the wind power plant pitch control system so as to achieve the purpose of improving the operation stability of equipment.

2. When emergency shutdown is needed, the variable-pitch EFC can be disconnected through the master control, namely an emergency feathering instruction, and emergency feathering shutdown of a variable-pitch system is realized through signals, so that the blades are feathered to a 90-degree safety position, and the use safety of the whole machine is ensured.

3. According to the invention, the variable pitch system has the function of independently cutting off the EFC signal by means of software upgrading and hardware modification, namely, the variable pitch system can automatically cut off the variable pitch EFC signal under the condition that the unit has the extreme abnormity, so that the emergency feathering shutdown function is triggered, and the unit safety is further improved.

The specific implementation mode is as follows:

example 1:

a safe pitch control method of an SSB direct current pitch control system of a wind power plant comprises the following steps:

firstly, the variable pitch system is enabled to have the function of independently cutting off the EFC signal in a mode of upgrading software and reforming hardware of the variable pitch system, namely the variable pitch system can automatically cut off the variable pitch EFC signal under the condition that the unit has the extreme abnormity, an emergency feathering shutdown function is triggered, and the unit safety is further improved;

(1) disconnecting the plug of the central control box O, the 400VAC power supply, the battery switch and the air switches 2Fl, 2F2, 2F8 and 2F9 of the central control box;

(2) the power socket 2Xl is removed, and the 2Xl terminal is wrapped by an insulating tape and then placed in a wire slot;

(3) installing a speed monitor at the original 2Xl position of a central control box, and installing a power-off delay time relay in the central control box; wiring according to requirements, and after checking that the wiring is correct, putting all wire harnesses into a wire slot;

(4) setting parameters of an ema speed monitor and a power-off delay time relay, upgrading an L + B program, disconnecting a circuit breaker 4Fl in a shaft cabinet 2 and a shaft cabinet 3, checking the wiring state of a 4Al power grid voltage detection module of the two-shaft cabinet, and ensuring that the wiring of a 4A1 three-phase incoming line power supply of the two-shaft cabinet is removed and the wiring port is connected to a terminal port;

(5) 1 circuit breaker 4Fl of disconnection axle cabinet, with the original 4Al module of Siemens three-phase multifunctional monitoring relay replacement, the mode of connection is as follows:

A. the 400V input connection mode is the same;

B. dismantling the original module 15 wiring terminal, and putting the module into a wire slot under the protection of an insulating tape;

C. the original module 25 wiring terminal is connected to the Ximen module No. 11 wiring terminal in a modified mode;

D. the original module 18, 28 terminals are switched to the siemens module No. 14 terminals.

(6) After all the air switches and the switches are closed, parameters of the Siemens three-phase multifunctional monitoring relay are set according to requirements;

(7) re-zeroing the variable pitch system;

(8) and after the transformation is completed, the unit is subjected to safety chain test.