A braking logic transformation circuit suitable for wind turbine generator sets

Abstract

The present invention provides a braking logic transformation circuit suitable for a wind turbine generator set. The system includes: after the hardware safety relay contacts 11 and 14 are connected in series with the software safety relay contacts 11 and 14, they jointly control the on and off of the high-speed brake solenoid valve of the unit with the newly added parallel branch 1; the yaw brake relay contacts 11 and 14 and the newly added parallel branch 2 jointly control the on and off of the yaw brake solenoid valve; the left yaw relay contacts 11 and 14 and the newly added parallel branch 3 are connected in parallel to jointly control the power on and off of the left yaw relay coil. The braking logic transformation circuit suitable for a wind turbine generator set provided by the present invention gives priority to air braking, crosswind yaw backup, and mechanical brake assistance when the unit is shut down, which to a certain extent avoids the friction fire of the brake system caused by excessive input of the brake system, and maximizes the reduction of the speed of the unit when it is in an overspeed state.

Description

Technical Field

[0001] The invention relates to the technical field of wind power generation, and in particular to a braking logic transformation circuit suitable for a wind power generator set. Background Art

[0002] The G58 unit adopts the variable-speed double-fed asynchronous power generation technology route. The two solutions of air brake for synchronous variable pitch of three blades and mechanical brake of high-speed shaft ensure the reliable shutdown of the unit. When emergency shutdown, the two brake systems are activated at the same time. Once the air brake fails, the mechanical brake action alone is easy to cause friction and fire of the brake system at high speed, and it is easy to have a large impact on the mechanical parts of the transmission chain such as the gearbox, thereby causing unit fire, tower collapse and other accidents. How to effectively avoid or reduce such unit fire and tower collapse accidents, extend the life of the transmission chain, and improve the overall safety performance of the unit is particularly important. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a braking logic transformation circuit suitable for a wind turbine generator set, which realizes a three-level shutdown protection strategy of air braking priority, side wind yaw backup, and mechanical brake assistance.

[0004] In order to solve the above technical problems, the present invention provides a braking logic transformation circuit suitable for a wind turbine generator set, the system comprising: a high-speed shaft brake control circuit, which is composed of the hardware safety relay KJ5 contact pins 11 and 14 and the software safety relay KR211 contact pins 11 and 14 connected in series, and jointly controls the on-off of the high-speed brake solenoid valve of the unit with the newly added parallel branch 1, and the newly added parallel branch 1 is composed of the overspeed relay KJ1 contact pins 9 and 10 and the emergency stop relay KJ2 contact pins 11 and 14 connected in series; a yaw brake control circuit, which is composed of the yaw brake relay KR173 contact pins 11 and 14 and the newly added parallel branch 2 to jointly control the on-off of the yaw brake solenoid valve D173, and the newly added parallel branch 2 is composed of the overspeed relay KJ4 contact pins 11 and 14 and the time relay KT contact pins 9 and 1 in series; the left yaw action circuit is composed of the left yaw relay contact pins 11 and 14 connected in parallel with the newly added parallel branch 3 to jointly control the power on and off of the left yaw relay KM180 coil. The newly added parallel branch 3 is the yaw timeout relay KM004 contact pins 21 and 24. The on-off control circuit of the yaw timeout relay contact pins 21 and 24 includes the overspeed relay KJ4 contact pins 31 and 34 and the time relay KT coil being connected in series to ground, and the yaw timeout relay KM004 contact pins 3 and 4 and the time relay KT contact pins 4 and 12 and the yaw timeout relay KM004 coil being connected in series to ground.

[0005] In some embodiments, before the introduction of the newly added parallel branch 1, when the unit is generating electricity normally, the hardware safety relay KJ5 contact pins 11 and 14 and the software safety relay KR211 contact pins 11 and 14 are in a closed state, the brake solenoid valve DZ11 coil is energized, and the high-speed shaft brake is not put into operation; when the unit reports a fault, the software safety chain or the hardware safety chain is disconnected, the corresponding safety relay KJ5 or KR211 contact is disconnected, the brake solenoid valve is de-energized, and the high-speed shaft brake is put into operation; after the introduction of the newly added parallel branch 1, when the unit reports a fault: 1) If the unit does not detect an overspeed fault, the overspeed relay KJ1 contact pins 9 and 10 are disconnected, the brake solenoid valve is de-energized, and the high-speed shaft brake is put into operation; 2) If the unit detects an overspeed fault and the emergency stop relay is not triggered, the brake solenoid valve is energized, and the high-speed shaft brake is not put into operation; 3) If the emergency stop button is triggered, the emergency stop relay KJ2 contact pins 11 and 14 are disconnected, the brake solenoid valve is de-energized, and the high-speed shaft brake is put into operation.

[0006] In some embodiments, before the introduction of the newly added parallel branch 2, when the main PLC controller issues a yaw permission instruction, the yaw brake relay KR173 coil is energized, the contact pins 11 and 14 are closed, the yaw brake solenoid valve is in the energized state, the yaw caliper is released, and yaw is allowed; after the introduction of the newly added parallel branch 2, when the main PLC controller does not issue a yaw permission instruction: 1) When the unit detects an overspeed fault and the yaw does not time out, the overspeed relay KJ4 contact pins 11 and 14 are closed, the time relay KT normally closed contact pins 1 and 9 are closed, the yaw brake solenoid valve is in the energized state, and yaw is allowed; 2) When the yaw times out, the time relay normally closed contact pins 1 and 9 are disconnected, the yaw brake solenoid valve is in the de-energized state, the yaw caliper is locked, and yaw is not allowed.

[0007] In some embodiments, before the newly added parallel branch 3 is introduced, when the main PLC controller issues a left yaw command, the left yaw relay KR180 coil is energized, contacts 11 and 14 are energized, the left yaw relay KM180 coil is energized, and the yaw system starts to yaw. Among them, the right yaw relay KM181 contact is in the normally closed state, and its main function is to prevent the left and right yaw from acting at the same time; after the introduction of the newly added parallel branch 3, when the main control PLC controller does not issue a left yaw command: 1) When the unit detects an overspeed fault, the overspeed relay KJ4 contact pins 31 and 34 are also closed, the time relay KT coil is energized, and the timing starts. The time relay KT contact pins 1, 9, 4, and 12 are in the normally closed state, the yaw timeout relay KM004 coil is energized, the contact pins 21 and 24 are closed, the left yaw relay coil is energized, and the yaw system starts to yaw to the left; 2) When the timing time exceeds 180s, the time relay KT contact pins 1, 9, 4, and 12 are disconnected, or when the unit does not detect the overspeed state, the overspeed relay KJ4 contact pins 31 and 34 are disconnected, the left yaw relay coil is de-energized, and the yaw system stops the left yaw action.

[0008] In some embodiments, when the emergency stop button is manually triggered in an emergency, the mechanical brake is activated and the original air brake of the unit is also activated at the same time. In the event of an emergency stop failure of other units, the mechanical brake can only be activated after the speed drops to the set value.

[0009] In some embodiments, when the unit needs to shut down, the unit's original air brake protection action is used. When the unit speed is still overspeeding, the crosswind yaw protection is activated. When the unit speed drops to the set overspeed value, the mechanical brake smooth braking system is activated.

[0010] After adopting such a design, the present invention has at least the following advantages:

[0011] The present invention provides a brake logic transformation circuit suitable for wind turbine generator sets. When the emergency stop button is manually triggered in an emergency, the air brake and the mechanical brake are put into use at the same time. In the case of emergency stop failure of other units, the mechanical brake can only be put into use after the speed drops to the set value. An automatic crosswind yaw function is added. When the control brake fails and causes the unit to overspeed, the unit starts automatic yaw, and the mechanical brake is put into use after the speed drops to the set value. When the unit needs to stop, a smooth braking system with air brake priority, crosswind yaw backup, and mechanical brake auxiliary is adopted. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The above is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0013] Figure 1To apply the high-speed shaft brake control circuit of the present invention;

[0014] Figure 2 To apply the yaw brake control circuit of the present invention;

[0015] Figure 3 The left yaw action circuit of the present invention is applicable. DETAILED DESCRIPTION

[0016] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0017] A brake logic transformation circuit suitable for G58 units. After the hardware safety relay KJ5 contact pins 11 and 14 are connected in series with the software safety relay KR211 contact pins 11 and 14, they jointly control the on and off of the unit's high-speed brake solenoid valve with the newly added parallel branch 1 to form a high-speed shaft brake control circuit. The newly added parallel branch 1 is composed of the overspeed relay KJ1 contact pins 9 and 10 connected in series with the emergency stop relay KJ2 contact pins 11 and 14.

[0018] The yaw brake relay KR173 contact pins 11 and 14 and the newly added parallel branch 2 jointly control the on and off of the yaw brake solenoid valve D173 to form a yaw brake control circuit. The newly added parallel branch 2 is composed of the overspeed relay KJ4 contact pins 11 and 14 and the time relay KT contact pins 9 and 1 in series.

[0019] After the left yaw relay contact pins 11 and 14 are connected in parallel with the newly added parallel branch 3, they jointly control the power on and off of the left yaw relay KM180 coil, forming a left yaw action circuit. The newly added parallel branch 3 is the yaw timeout relay KM004 contact pins 21 and 24. The on-off control circuit of the yaw timeout relay contact pins 21 and 24 includes the overspeed relay KJ4 contact pins 31 and 34 and the time relay KT coil being connected in series to ground, and the yaw timeout relay KM004 contact pins 3 and 4 and the time relay KT contact pins 4 and 12 and the yaw timeout relay KM004 coil being connected in series to ground.

[0020] Furthermore, the high-speed shaft brake control circuit is as follows: Figure 1As shown, it is characterized in that before the introduction of the newly added parallel branch 1, when the unit is generating electricity normally, the hardware safety relay KJ5 contact pins 11 and 14 and the software safety relay KR211 contact pins 11 and 14 are in a closed state, the brake solenoid valve DZ11 coil is energized, and the high-speed shaft brake is not put into operation. When the unit reports a fault, the software safety chain or the hardware safety chain is disconnected, the corresponding safety relay KJ5 or KR211 contact is disconnected, the brake solenoid valve loses power, and the high-speed shaft brake is put into operation. After the introduction of the newly added parallel branch 1, when the unit reports a fault: 1) If the unit does not detect an overspeed fault (1100r / min), the overspeed relay KJ1 contact pins 9 and 10 are disconnected, the brake solenoid valve is in a de-energized state, and the high-speed shaft brake is engaged; 2) If the unit detects an overspeed fault and the emergency stop relay is not triggered, the brake solenoid valve is energized, and the high-speed shaft brake is not engaged; 3) If the emergency stop button is triggered, the emergency stop relay KJ2 contact pins 11 and 14 are disconnected, the brake solenoid valve is in a de-energized state, and the high-speed shaft brake is engaged.

[0021] Furthermore, the yaw brake control circuit is as follows: Figure 2 As shown, before the introduction of the newly added parallel branch 2, when the main control PLC controller issues a yaw permission instruction, the yaw brake relay KR173 coil is energized, the contact pins 11 and 14 are closed, the yaw brake solenoid valve is energized, the yaw caliper is released, and yaw is allowed. After the introduction of the newly added parallel branch 2, when the main control PLC controller does not issue a yaw permission instruction: 1) When the unit detects an overspeed fault (1800r / min) and the yaw does not time out, the overspeed relay KJ4 contact pins 11 and 14 are closed, the time relay KT normally closed contact pins 1 and 9 are closed, the yaw brake solenoid valve is energized, and yaw is allowed; 2) When the yaw times out, the time relay normally closed contact pins 1 and 9 are disconnected, the yaw brake solenoid valve is de-energized, the yaw caliper is locked, and yaw is not allowed.

[0022] Furthermore, the left yaw action circuit is as follows: Figure 3As shown, before the introduction of the newly added parallel branch 3, when the main control PLC controller issues a left yaw command, the left yaw relay KR180 coil is energized, the contact pins 11 and 14 are energized, the left yaw relay KM180 coil is energized, and the yaw system starts to yaw. Among them, the right yaw relay KM181 contact is in a normally closed state, and its main function is to prevent the left and right yaws from acting at the same time. After the introduction of the newly added parallel branch 3, when the main control PLC controller does not issue a left yaw command: 1) When the unit detects an overspeed fault, the overspeed relay KJ4 contact pins 31 and 34 are also closed, the time relay KT coil is energized, and the timing starts. The time relay KT contact pins 1, 9, 4, and 12 are in a normally closed state, the yaw timeout relay KM004 coil is energized, the contact pins 21 and 24 are closed, the left yaw relay coil is energized, and the yaw system starts to yaw to the left. 2) When the timing time exceeds 180s, the contact pins 1, 9, 4, and 12 of the time relay KT are disconnected, or when the unit does not detect the overspeed state, the contact pins 31 and 34 of the overspeed relay KJ4 are disconnected, the left yaw relay coil is de-energized, and the yaw system stops the left yaw action.

[0023] Furthermore, in the high-speed shaft brake control circuit, when the emergency stop button is manually triggered in an emergency, the mechanical brake is activated and the original air brake of the unit is also activated at the same time. In the event of an emergency stop failure of other units, the mechanical brake can only be activated after the speed drops to the set value.

[0024] Furthermore, the brake logic transformation circuit applicable to the G58 unit adopts the original air brake protection action of the unit when the unit needs to be shut down. When the unit speed is still overspeed (≥1800r / min), the crosswind yaw protection is put into operation. When the unit speed drops to the set overspeed value (1100r / min), the mechanical brake smooth braking system is put into operation. A three-level shutdown protection strategy of air brake priority, crosswind yaw backup, and mechanical brake assistance is realized.

[0025] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Those skilled in the art may make some simple modifications, equivalent changes or modifications using the technical contents disclosed above, which all fall within the protection scope of the present invention.

Claims

1. A braking logic transformation circuit suitable for a wind turbine generator set, characterized in that: include: The high-speed shaft brake control circuit is composed of the hardware safety relay KJ5 contact pins 11 and 14 and the software safety relay KR211 contact pins 11 and 14 connected in series, and together with the newly added parallel branch 1, controls the on and off of the unit's high-speed brake solenoid valve. The newly added parallel branch 1 is composed of the overspeed relay KJ1 contact pins 9 and 10 and the emergency stop relay KJ2 contact pins 11 and 14 connected in series; The yaw brake control circuit is composed of the yaw brake relay KR173 contact pins 11 and 14 and the newly added parallel branch 2 to control the on and off of the yaw brake solenoid valve D173. The newly added parallel branch 2 is composed of the overspeed relay KJ4 contact pins 11 and 14 and the time relay KT contact pins 9 and 1 in series; The left yaw action circuit is connected in parallel by the left yaw relay contact pins 11 and 14 and the newly added parallel branch 3 to jointly control the power on and off of the left yaw relay KM180 coil. The newly added parallel branch 3 is the yaw timeout relay KM004 contact pins 21 and 24. The on-off control circuit of the yaw timeout relay contact pins 21 and 24 includes: the overspeed relay KJ4 contact pins 31 and 34 are connected in series with the time relay KT coil to ground; the yaw timeout relay KM004 contact pins 3 and 4 are connected in series with the time relay KT contact pins 4 and 12, and the yaw timeout relay KM004 coil to ground; Before the introduction of the newly added parallel branch 1, when the unit is generating electricity normally, the contact pins 11 and 14 of the hardware safety relay KJ5 and the contact pins 11 and 14 of the software safety relay KR211 are in a closed state, the coil of the brake solenoid valve DZ11 is energized, and the high-speed shaft brake is not put into operation; when the unit reports a fault, the software safety chain or the hardware safety chain is disconnected, the corresponding safety relay KJ5 or KR211 contact is disconnected, the brake solenoid valve loses power, and the high-speed shaft brake is put into operation; Before the introduction of the newly added parallel branch 2, when the main PLC controller issues a yaw permission command, the yaw brake relay KR173 coil is energized, contacts 11 and 14 are closed, the yaw brake solenoid valve is energized, the yaw caliper is released, and yaw is allowed.

2. A braking logic transformation circuit suitable for a wind turbine generator set according to claim 1, characterized in that: After the introduction of the newly added parallel branch 1, when the unit reports a fault: 1) If the unit does not detect an overspeed fault, the overspeed relay KJ1 contact pins 9 and 10 are disconnected, the brake solenoid valve is in a power-off state, and the high-speed shaft brake is put into operation; 2) If the unit detects an overspeed fault and the emergency stop relay is not triggered, the brake solenoid valve is energized, and the high-speed shaft brake is not put into operation; 3) If the emergency stop button is triggered, the emergency stop relay KJ2 contact pins 11 and 14 are disconnected, the brake solenoid valve is in a power-off state, and the high-speed shaft brake is put into operation.

3. A braking logic transformation circuit suitable for a wind turbine generator set according to claim 1, characterized in that: After the introduction of the newly added parallel branch 2, when the main PLC controller does not issue a yaw permission command: 1) When the unit detects an overspeed fault and the yaw does not time out, the overspeed relay KJ4 contacts 11 and 14 are closed, the time relay KT normally closed contacts 1 and 9 are closed, the yaw brake solenoid valve is energized, and yaw is allowed; 2) When the yaw times out, the time relay normally closed contacts 1 and 9 are disconnected, the yaw brake solenoid valve is de-energized, the yaw caliper is locked, and yaw is not allowed.

4. A braking logic transformation circuit suitable for a wind turbine generator set according to claim 1, characterized in that: Before the introduction of the newly added parallel branch 3, when the main PLC controller issues a left yaw command, the left yaw relay KR180 coil is energized, contacts 11 and 14 are energized, the left yaw relay KM180 coil is energized, and the yaw system starts to yaw.

5. A braking logic transformation circuit suitable for a wind turbine generator set according to claim 4, characterized in that: The contacts of the right yaw relay KM181 are in the normally closed state, and its main function is to prevent the left and right yaw from operating simultaneously.

6. A braking logic transformation circuit suitable for a wind turbine generator set according to claim 4, characterized in that: After the introduction of the newly added parallel branch 3, when the main PLC controller does not issue a left yaw command: 1) When the unit detects an overspeed fault, the overspeed relay KJ4 contact pins 31 and 34 are also closed, the time relay KT coil is energized, and the timing starts. The time relay KT contact pins 1, 9, 4, and 12 are normally closed, the yaw timeout relay KM004 coil is energized, the contact pins 21 and 24 are closed, the left yaw relay coil is energized, and the yaw system starts to deviate to the left; 2) When the timing time exceeds 180s, the time relay KT contact pins 1, 9, 4, and 12 are disconnected, or when the unit does not detect an overspeed state, the overspeed relay KJ4 contact pins 31 and 34 are disconnected, the left yaw relay coil is de-energized, and the yaw system stops the left deflection action.

7. The braking logic transformation circuit suitable for a wind turbine generator set according to claim 1, characterized in that: When the emergency stop button is manually triggered in an emergency, the mechanical brake is activated and the original air brake of the unit is also activated at the same time. In the event of an emergency stop failure of other units, the mechanical brake can only be activated after the speed drops to the set value.

8. The braking logic transformation circuit suitable for a wind turbine generator set according to claim 1, characterized in that: When the unit needs to shut down, the unit's original air brake protection action is used. When the unit speed is still overspeeding, the crosswind yaw protection is activated. When the unit speed drops to the set overspeed value, the mechanical brake smooth braking system is activated.

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