CN117662440A - Pressure oil device of speed regulating system of large hydraulic generator and control method of pressure oil pump - Google Patents

Abstract

The invention provides a pressure oil device of a speed regulation system of a large hydraulic generator, which comprises a speed regulator main oil pipe, a pressure oil tank, an oil return tank, an oil cooler and an electrostatic oil filter, wherein the pressure oil tank is connected to the tail end of the speed regulator main oil pipe, the pressure oil tank is connected with a gas tank for pressurizing the pressure oil tank, the speed regulator main oil pipe is connected with a plurality of groups of low-power pressure oil systems and high-power pressure oil systems in parallel, each group of low-power pressure oil systems consists of a loading and unloading valve group, an oil filter and a small pump which are connected in series, each high-power pressure oil system consists of the loading and unloading valve group, the oil filter and the large pump which are connected in series, the oil return tank is respectively connected with each loading and unloading valve group, and the oil cooler is arranged between the oil return tank and the loading and unloading valve group. The control method of the pressure oil pump of the speed regulating system of the large-sized hydraulic generator is also provided, a stable pressure oil source is provided for the speed regulating system through specific flow control, meanwhile, the energy consumption is reduced, the cost is reduced, the pressure oil pump automatically rotates, and the device is dehumidified regularly, so that the safe and stable operation of the device is ensured.

Description

Pressure oil device of speed regulating system of large hydraulic generator and control method of pressure oil pump

Technical Field

The invention relates to the technical field of generator oil pump control, in particular to an oil pump control device and an oil pump control method for a speed regulation system of a large-sized hydraulic generator.

Background

The speed regulator is one of the important control devices of the hydro-generator set. The governor oil pressure device is an important component of a governor hydraulic system and mainly comprises a pressure oil tank and a gas tank, an oil return tank, an oil pump motor unit, a hydraulic valve group and other accessories. The hydraulic system of the speed regulator provides a power oil source for operation and control of the speed regulator through control of the oil pressure device, so that safe and stable operation of the water turbine is ensured. The specific process is as follows: the normal pressure turbine oil stored in the oil return tank is pressurized by the pressure oil pump and is conveyed to the pressure oil tank. The high-pressure turbine oil in the pressure oil tank is used for adjusting the water turbine to do work through an oil way of the speed regulating system, the turbine oil after doing work is changed into normal pressure from high pressure and returns to the oil return tank, the turbine oil returned to the oil return tank is pressurized by the pressure oil pump, and the next work is ready to be done, so that the reciprocating cycle is performed.

The oil pump motor unit of the current governor oil pressure device is generally composed of 3-4 oil pumps and motors thereof. When the speed regulator hydraulic system operates, one of the oil pumps is used as a main pump to continuously operate, the system pressure is maintained, and the rest oil pumps are reserved. When the hydraulic system of the speed regulator is started next time, the main pump rotates, and the other oil pump is started to operate as the main pump. If the speed regulating system runs continuously for a long time, the main pump does not switch for a long time, the equipment is tired, and the service life is reduced; the standby pump is stopped for a long time, the motor is easy to wet, insulation is reduced, and equipment is damaged.

Disclosure of Invention

Aiming at the defects existing in the prior art, the invention provides a large-scale hydraulic generator speed regulating system pressure oil device and a pressure oil pump control method, and in order to achieve the purposes, the invention adopts the following technical scheme:

the invention provides a large hydraulic generator speed regulation system oil pressing device which comprises a speed regulator main oil pipe, a pressure oil tank, an oil return tank, an oil cooler and an electrostatic oil filter, wherein the pressure oil tank is connected to the tail end of the speed regulator main oil pipe, the pressure oil tank is connected with a gas tank for pressurizing the pressure oil tank, a plurality of groups of small-power oil pressing systems and high-power oil pressing systems are connected on the speed regulator main oil pipe in parallel, each small-power oil pressing system consists of a loading and unloading valve group, an oil filter and a small pump in series, each large-power oil pressing system consists of a loading and unloading valve group, an oil filter and a large pump in series, the small pump and the large pump are connected to the oil return tank, the oil return tank is respectively connected with each loading and unloading valve group, the oil cooler is arranged between the oil return tank and the loading and unloading valve group, and the electrostatic oil filter is arranged on the oil return tank.

Further, the power range of the small pump is 10-60 kw, and the power range of the large pump is 120-200 kw.

Furthermore, two small pumps are respectively P1 and P2, and two large pumps are respectively P3 and P4.

The invention also provides a control method of the oil pump of the speed regulating system of the large-sized hydraulic generator, which utilizes the oil pressing device and comprises the following steps:

when the hydraulic system is in a stop state and a remote starting condition is met, after a monitoring hydraulic system is started, a big pump is started to load and operate, after the system pressure rises to a rated working pressure, the pump is unloaded, a small pump is started to operate, the big pump is stopped, the pressure of the hydraulic system is maintained at the rated working pressure through the loading and unloading control of the small pump, the normal operation of a speed regulator is ensured, the two big pumps are not available, the monitoring command is sent to stop the hydraulic system, the big fault of the hydraulic system is reported, the two small pumps are not available, the state of the big pump is judged, the two big pumps are available, the fault of the hydraulic system is reported, the current big pump is kept to operate, the normal operation of the speed regulator hydraulic system is maintained through the loading and unloading control of the big pump, otherwise, the command is monitored, and the big fault of the hydraulic system is reported;

performing rotation control on the main operation pump, switching the main operation pump when the continuous operation time of the main operation pump reaches 72 hours or the main operation pump fails, starting the other small pump, stopping the original operation pump after successful starting, reporting the failure after the failure of starting, and maintaining the operation of the original main pump after the failure of switching the main pump, and starting any large pump after the failure of both small pumps;

when the hydraulic system is operated, the pressure of the hydraulic system and the oil level of the oil tank are maintained in a normal working range through the loading and unloading control of the current operating pump, when the pressure of the system is smaller than the rated working pressure or the oil level of the oil tank is smaller than 2000mm, the oil pump is loaded and operated, when the pressure of the system is larger than the rated working pressure or the oil level of the oil tank is larger than 2700mm, the oil pump is unloaded and operated, if the loading and unloading of the oil pump fails, the oil pump is reported to be failed, and the main pump is switched;

when the hydraulic system normally operates, the system pressure is maintained through the loading and unloading control of the small pump, and if the system pressure is too low, the auxiliary loading operation of the large pump is needed, so that the hydraulic system is rapidly pressurized to the rated working pressure;

when the hydraulic system of the speed regulator normally operates, the system pressure is maintained through the loading and unloading control of the small pump, the large pump is in a stop state for a long time, when the hydraulic system stops operating for a long time, all the oil pumps are in the stop state for a long time, the oil pump motor is dehumidified regularly through flow control, the oil pump is in an automatic mode, no fault alarm is given, the continuous stop time of the large pump reaches 168 hours, the large pump is started, the continuous stop time of the large pump is cleared when the large pump is started successfully, the large pump is stopped after the large pump operates for 1 hour, the continuous stop time of the large pump is restarted to count time, the large pump is started failure, and the oil pump is failed in dehumidification.

Further, the remote starting conditions of the hydraulic system comprise an on-site control mode of the hydraulic system, main faults of the hydraulic system, too low pressure of the pressure oil tank, too low liquid level of the pressure oil tank and too low liquid level of the oil return tank, and the hydraulic system cannot be started remotely if any condition is met.

Further, the control method for switching the small pump after starting the loading operation of the large pump comprises the following steps:

step 1, a speed regulator hydraulic system receives a monitoring hydraulic system starting command, judges whether a hydraulic system starting condition is met, if so, executes the next step, and if not, jumps to step 11;

step 2, comparing the accumulated running time of the two pumps P3 and P4, taking the shorter time, starting the pump P3 or P4, and executing the next step;

step 3, judging whether the P3 or P4 pump is started successfully, if the P3 or P4 pump is started successfully, executing the next step, and if the P3 or P4 pump is started successfully, jumping to the step 5;

step 4, loading the P3 or P4 pump, judging whether the P3 or P4 pump is loaded successfully, if the P3 or P4 pump is loaded successfully, comparing the system pressure Y1 with a set value in real time, if Y1 is smaller than the rated working pressure, the P3 or P4 pump keeps loading operation, if Y1 is larger than the rated working pressure, jumping to step 7, if the P3 or P4 pump fails to load, stopping the pump P3 or P4, and executing the next step;

step 5, alarming that the P3 or P4 pump fails to be available, starting the other big pump P4 or P3, judging whether the P4 or P3 pump is started successfully, if the P4 or P3 pump is started successfully, executing the next step, and if the P4 or P3 pump is started successfully, alarming that the two big pumps P3 and P4 fail to be available, and jumping to the step 11;

step 6, loading the P4 or P3 pump, judging whether the P4 or P3 pump is loaded successfully, if the P4 or P3 pump is loaded successfully, comparing the system pressure Y1 with a set value in real time, if Y1 is smaller than the rated working pressure, the P4 or P3 pump keeps loading operation, and if Y1 is larger than the rated working pressure, executing the next step;

step 7, comparing the accumulated running time of the two small pumps P1 and P2 when the pump P3 or P4 is currently running, starting the pump P1 or P2 when the time is shorter, and executing the next step;

step 8, judging whether the P1 or P2 pump is started successfully, if the P1 or P2 pump is started successfully, executing the next step, if the P1 or P2 pump is started successfully, alarming that the P1 or P2 pump is not available, starting the other small pump P2 or P1, judging whether the P2 or P1 pump is started successfully, if the P2 or P1 pump is started successfully, executing the step 9, if the P2 or P1 pump is started successfully, alarming that the two small pumps P1 and P2 are not available, and jumping to the step 10;

step 9, stopping the current running of the big pump P3 or P4, completing the starting of the hydraulic system, and ending the flow;

step 10, judging the states of the two big pumps P3 and P4, if the two big pumps P3 and P4 have no faults, keeping the running of the big pump P3 or P4 currently running, finishing the starting of the hydraulic system, ending the flow, and if any fault of the P3 and P4 is not available, executing the next step;

and step 11, alarming the large fault of the hydraulic system, stopping the hydraulic system, and ending the flow.

Further, the main pump switching control method includes:

step 12, operating the P1 or P2 pump in a hydraulic system operation state, if the P1 or P2 pump fails, alarming that the P1 or P2 pump fails, executing the next step, if the P1 or P2 pump operates normally, comparing the continuous operation time of the P1 or P2 pump with a fixed value in real time, if the continuous operation time is less than 72h, keeping the P1 or P2 pump to operate, and if the continuous operation time is more than or equal to 72h, executing the next step;

step 13, a main pump reversing command is sent out, a P2 or P1 pump is started, whether the P2 or P1 pump is started successfully is judged, if the P2 or P1 pump is started successfully, the next step is executed, if the P2 or P1 pump is started successfully, the alarm that the P2 or P1 pump is unavailable is given, and the step 15 is skipped;

step 14, stopping the P1 or P2 pump, finishing the main pump switching, and ending the flow;

step 15, judging whether the faults of the two small pumps P1 and P2 are unavailable, if yes, executing the next step; if not, jumping to the step 17;

step 16, starting a big pump P3 or P4 to run, alarming the main pump switching failure, and ending the flow;

and step 17, maintaining the operation of the original main pump P1 or P2, alarming the failure of main pump switching, and ending the flow.

Furthermore, the method for controlling loading and unloading of the pressure oil pump comprises the following steps:

step 18, the operation state of the hydraulic system, the operation of the P1 or P2 pump, the real-time comparison of the pressure of the hydraulic system and the oil level sampling value and the fixed value of the oil tank, if the system pressure is smaller than the rated working pressure or the oil level of the oil tank is smaller than 2000mm, the next step is executed, and if the system pressure is larger than the rated working pressure or the oil level of the oil tank is larger than 2700mm, the step 20 is skipped;

step 19, loading the P1 or P2 pump, judging whether the P1 or P2 pump is loaded successfully, if the P1 or P2 pump is loaded successfully, jumping to step 1, and if the P1 or P2 pump is loaded failed, jumping to step 21;

step 20, unloading the P1 or P2 pump, judging whether the P1 or P2 pump is successfully unloaded, if the P1 or P2 pump is successfully unloaded, jumping to the step 1, and if the P1 or P2 pump is failed to be unloaded, executing the next step;

and step 21, alarming that the P1 or P2 pump fails to be available, and starting a main pump switching control flow.

Further, the hydraulic system auxiliary loading control method comprises the following steps:

step 22, comparing the pressure of the hydraulic system with a fixed value in real time, if the pressure of the hydraulic system is larger than the rated working pressure, executing the next step, if the pressure of the hydraulic system is smaller than the rated working pressure, jumping to step 24, and if the pressure of the hydraulic system is smaller than the rated working pressure, jumping to step 25;

step 23, if the number of the operating oil pumps is more than 1, unloading and stopping a large pump, and jumping to the step 22;

step 24, if the number of the operating pumps is less than 2, starting a big pump to load and operate, and jumping to the step 22;

and step 25, if the number of the operating pumps is less than 3, starting a big pump to load and operate, and jumping to the step 22.

Further, the dehumidification control method of the oil pump motor comprises the following steps:

step 26, the fault-free alarm of the pressure oil pump P1, P2, P3 or P4 and the automatic mode are adopted, the continuous shutdown time and the fixed value of the pressure oil pump P1, P2, P3 or P4 are compared in real time, and if the continuous shutdown time is more than 168 hours, the next step is executed;

step 27, starting the oil pump P1, P2, P3 or P4, judging whether the oil pump P1, P2, P3 or P4 is started successfully, if the oil pump P1, P2, P3 or P4 is started successfully, executing the next step, if the oil pump P1, P2, P3 or P4 is failed to start, jumping to step 30;

step 28, resetting the continuous running time of the pressure oil pump P1, P2, P3 or P4, delaying for 1h, and executing the next step;

29, stopping the pump of the pressure oil pump P1, P2, P3 or P4, starting timing the continuous pump stop time, and jumping to the step 26;

and 30, alarming that the fault of the oil pressing pump P1, P2, P3 or P4 is unavailable and that the dehumidification of the oil pressing pump P1, P2, P3 or P4 is failed, and ending the flow.

Drawings

The invention is further illustrated by the following examples in conjunction with the accompanying drawings:

FIG. 1 is a schematic diagram of an oil hydraulic device according to an embodiment of the present invention;

FIG. 2 is a flow chart illustrating the control of switching the small pump after the large pump is started to operate in a loading mode according to the embodiment of the invention;

fig. 3 is a main pump switching control flow chart according to an embodiment of the present invention;

FIG. 4 is a flow chart of the control of loading and unloading of a hydraulic pump according to an embodiment of the present invention;

FIG. 5 is a flow chart of the auxiliary loading control of the hydraulic system according to the embodiment of the invention;

fig. 6 is a flow chart of dehumidification control of an oil pump motor according to an embodiment of the present invention.

In the above figures: the device comprises a pressure oil tank 1, a gas tank 2, an oil return tank 3, a small pump 4, a small pump 5, a large pump 6, a large pump 7, a speed regulator main oil pipe 8, a speed regulator system pressure Y1, an oil tank pressure Y2, a loading and unloading valve group 11, an oil filter 12, an oil cooler 13 and an electrostatic oil filter 14.

Detailed Description

The technical scheme of the invention is further described below with reference to the accompanying drawings and examples.

As shown in fig. 1, the invention provides a large hydraulic generator speed regulation system oil pressing device, which comprises a speed regulator main oil pipe 8, a pressure oil tank 1, an oil return tank 3, an oil cooler 13 and an electrostatic oil filter 14, wherein the pressure oil tank 1 is connected to the tail end of the speed regulator main oil pipe 8, the pressure oil tank 1 is connected with a gas tank 2 for pressurizing the pressure oil tank 1, a plurality of groups of low-power oil pressing systems and high-power oil pressing systems are connected in parallel on the speed regulator main oil pipe 8, each low-power oil pressing system is formed by connecting a loading and unloading valve group 11, an oil filter 12 and small pumps 4 and 5 in series, each high-power oil pressing system is formed by connecting a loading and unloading valve group 11, an oil filter 12 and large pumps 6 and 7 in series, the small pumps 4, 5 and the large pumps 6 and 7 are connected to the oil return tank 3 respectively, the oil cooler 13 is arranged between the oil return tank 3 and the loading and unloading valve groups 11, and the electrostatic oil filter 14 is arranged on the oil return tank 3.

Further, the power range of the small pump is 10-60 KW including 10KW, 20KW, 30KW, 40KW, 50KW and 60KW, and the power range of the large pump is 120-200 KW including 120KW, 150KW, 160KW, 180KW and 200KW.

Furthermore, the small pumps are two, namely P1 and P2, and the large pumps are two, namely P3 and P4

The oil pump motor unit is composed of two large pumps (motor power 160 kw) and two small pumps (motor power 30 kw), and the equipment cost is reduced. The small pump is used as the main pump to continuously run, so that the energy is saved and the environment is protected compared with the large pump.

When the speed regulator hydraulic system normally operates, the two small pump wheels are switched to operate, and when the continuous operation time of the small pump reaches 72 hours, the main pump is switched to the other small pump to operate.

When the speed regulator hydraulic system normally operates, only one small pump is required to operate, the system pressure is maintained through the loading and unloading control of the main pump, and when the system pressure is too low, the large pump is started to assist in loading operation, so that the system pressure can quickly reach the normal working pressure.

And when the continuous shutdown time of the oil pump reaches 168 hours, the pump is started to run for one hour, so that the motor of the oil pump is prevented from being wetted, the insulation is reduced, and the motor is prevented from being damaged.

The invention also provides a control method of the oil pump of the speed regulating system of the large-sized hydraulic generator, which utilizes the oil pressing device and comprises the following steps:

when the hydraulic system is in a stop state and a remote starting condition is met, after a monitoring hydraulic system is started, a big pump is started to load and operate, after the system pressure rises to a rated working pressure, the pump is unloaded, a small pump is started to operate, the big pump is stopped, the pressure of the hydraulic system is maintained at the rated working pressure through the loading and unloading control of the small pump, the normal operation of a speed regulator is ensured, the two big pumps are not available, the monitoring command is sent to stop the hydraulic system, the big fault of the hydraulic system is reported, the two small pumps are not available, the state of the big pump is judged, the two big pumps are available, the fault of the hydraulic system is reported, the current big pump is kept to operate, the normal operation of the speed regulator hydraulic system is maintained through the loading and unloading control of the big pump, otherwise, the command is monitored, and the big fault of the hydraulic system is reported;

performing rotation control on the main operation pump, switching the main operation pump when the continuous operation time of the main operation pump reaches 72 hours or the main operation pump fails, starting the other small pump, stopping the original operation pump after successful starting, reporting the failure after the failure of starting, and maintaining the operation of the original main pump after the failure of switching the main pump, and starting any large pump after the failure of both small pumps;

when the hydraulic system is operated, the pressure of the hydraulic system and the oil level of the oil tank are maintained in a normal working range through the loading and unloading control of the current operating pump, when the pressure of the system is smaller than the rated working pressure or the oil level of the oil tank is smaller than 2000mm, the oil pump is loaded and operated, when the pressure of the system is larger than the rated working pressure or the oil level of the oil tank is larger than 2700mm, the oil pump is unloaded and operated, if the loading and unloading of the oil pump fails, the oil pump is reported to be failed, and the main pump is switched;

when the hydraulic system normally operates, the system pressure is maintained through the loading and unloading control of the small pump, and if the system pressure is too low, the auxiliary loading operation of the large pump is needed, so that the hydraulic system is rapidly pressurized to the rated working pressure;

when the hydraulic system of the speed regulator normally operates, the system pressure is maintained through the loading and unloading control of the small pump, the large pump is in a stop state for a long time, when the hydraulic system stops operating for a long time, all the oil pumps are in the stop state for a long time, the oil pump motor is dehumidified regularly through flow control, the oil pump is in an automatic mode, no fault alarm is given, the continuous stop time of the large pump reaches 168 hours, the large pump is started, the continuous stop time of the large pump is cleared when the large pump is started successfully, the large pump is stopped after the large pump operates for 1 hour, the continuous stop time of the large pump is restarted to count time, the large pump is started failure, and the oil pump is failed in dehumidification.

Wherein, the monitoring system starts the control flow of the speed regulator hydraulic system:

when the speed regulator hydraulic system is started, the pressure of the speed regulator hydraulic system needs to be regulated to 6.1-6.3MPa as soon as possible, the large pump is started to carry out loading operation so as to boost the pressure of the hydraulic system to 6.3MPa, and then the small pump is started to carry out operation so as to maintain the pressure of the system.

The control flow is as follows:

when the hydraulic system is in a stop state and a remote starting condition is met, after the monitoring hydraulic system is started, a large pump is started to load and operate (the preferential accumulated operation time is short), the pump is unloaded after the system pressure is increased to 6.3MPa, a small pump is started to operate (the preferential accumulated operation time is short), the large pump is stopped, the hydraulic system pressure is maintained to be between 6.1 and 6.3MPa through the loading and unloading control of the small pump, and the normal operation of the speed regulator is ensured.

And if the two large pumps are not available, monitoring the hydraulic system to stop and reporting the large faults of the hydraulic system.

And judging the state of the large pump if two small pumps are not available. And if the two large pumps are available, the hydraulic system is reported to be faulty, the current large pump is kept to run, and the normal running of the speed regulator hydraulic system is maintained through the loading and unloading control of the large pumps. Otherwise, monitoring the command stopping hydraulic system and reporting the major fault of the hydraulic system.

As shown in fig. 2, the specific steps are as follows:

step 1: the speed regulator hydraulic system receives the monitoring hydraulic system starting command, judges whether the hydraulic system starting condition is met, and if the condition is met, executes the next step; if the start condition is not satisfied, the process goes to step 11.

Step 2: comparing the accumulated running time of the two pumps P3 and P4, taking the shorter time, starting the pump P3 (P4), and executing the next step.

Step 3: judging whether the P3 (P4) pump is started successfully, and if the P3 (P4) pump is started successfully, executing the next step; if the P3 (P4) pump fails to start, the process jumps to step 5.

Step 4: and (3) loading the pump P3 (P4), judging whether the pump P3 (P4) is loaded successfully, and if the pump P3 (P4) is loaded successfully, comparing the system pressure Y1 with a set value in real time. If Y1 is less than 6.3MPa, the P3 (P4) pump keeps running under loading; if Y1 is more than or equal to 6.3MPa, jumping to the step 7. If P3 (P4) fails to load, the pump P3 (P4) is stopped, and the next step is executed.

Step 5: and (3) alarming that the pump P3 (P4) is unavailable, starting the other big pump P4 (P3), judging whether the pump P4 (P3) is successfully started, if the pump P4 (P3) is successfully started, executing the next step, and if the pump P4 (P3) is failed to be started, alarming that the two big pumps P3 and P4 are unavailable, and jumping to the step 11.

Step 6: and P4 (P3) pump loading command, judging whether the P4 (P3) pump is loaded successfully, and if the P4 (P3) pump is loaded successfully, comparing the system pressure Y1 with a set value in real time. If Y1 is less than 6.3MPa, the P4 (P3) pump keeps running under loading; if Y1 is more than or equal to 6.3MPa, executing the next step.

Step 7: the pump P3 or P4 is currently operated to unload, the accumulated operation time of the two small pumps P1 and P2 is compared, the pump P1 (P2) is started if the time is shorter, and the next step is executed

Step 8: judging whether the P1 (P2) pump is started successfully, and if the P1 (P2) pump is started successfully, executing the next step; if the pump P1 (P2) fails to start, the alarm "the pump P1 (P2) fails to be available", the other small pump P2 (P1) is started, whether the pump P2 (P1) is started successfully or not is judged, if the pump P2 (P1) is started successfully, the step 9 is executed, and if the pump P2 (P1) fails to start, the alarm "the two small pumps P1 and P2 fail to be available" is skipped to the step 10.

Step 9: and stopping the current operation of the large pump P3 or P4, completing the starting of the hydraulic system, and ending the flow.

Step 10: judging the states of the two big pumps P3 and P4, if the two big pumps P3 and P4 have no faults, keeping the running of the big pump P3 or P4 currently running, completing the starting of the hydraulic system, and ending the flow. If either of the faults P3, P4 is not available, the next step is executed.

Step 11: and (5) alarming the large fault of the hydraulic system, stopping the hydraulic system, and ending the flow.

The main pump switching control flow comprises the following steps:

when the hydraulic system is in normal operation, the pressure of the hydraulic system is maintained through the loading and unloading control of the small pump. The long-time continuous operation of the oil pressing pump can cause metal fatigue of the oil pump and the motor, reduce the service life of equipment and influence the safe and stable operation of a hydraulic system. The main operation pump is thus subjected to rotation control. And when the continuous running time of the main running pump reaches 72 hours or the main pump fails, switching the main pump, and starting the other small pump. And if the starting is successful, stopping the original main pump, and ending the flow. And if the start-up fails, reporting a pump failure, and if the main pump is failed to switch, maintaining the operation of the original main pump. And if both the small pumps are failed, starting any one of the large pumps to operate.

As shown in fig. 3, the specific steps are as follows:

step 12: the hydraulic system is running, and the P1 (P2) pump is running. If the P1 (P2) pump fails, alarming that the P1 (P2) pump fails to be available, executing the next step, if the P1 (P2) pump runs normally, comparing the continuous running time of the P1 (P2) pump with a fixed value in real time, if the continuous running time is less than 72h, keeping the P1 (P2) pump running, and if the continuous running time is more than or equal to 72h, executing the next step.

Step 13: and (3) starting the main pump reversing command, starting the P2 (P1) pump, judging whether the P2 (P1) pump is started successfully, if the P2 (P1) pump is started successfully, executing the next step, and if the P2 (P1) pump is started successfully, alarming that the P2 (P1) pump is not available in fault, and jumping to the step (15).

Step 14: stopping the P1 (P2) pump, completing the main pump switching, and ending the flow.

Step 15: it is determined whether both pumps P1, P2 are malfunctioning or not. If yes, executing the next step; if not, go to step 17.

Step 16: and starting a big pump P3 or P4 to run, alarming the main pump switching failure, and ending the flow.

Step 17: and (4) keeping the original main pump P1 (P2) to operate, and giving an alarm of 'main pump switching failure', and ending the flow.

The control flow of loading and unloading of the pressure oil pump comprises the following steps:

when the hydraulic system is in operation, the pressure of the hydraulic system and the oil level of the oil tank are maintained in a normal working range through loading and unloading control of the current operation pump. When the system pressure is less than 6.1MPa or the oil level of the oil tank is less than 2000mm, the oil pump is loaded and operated; and when the system pressure is more than 6.3MPa or the oil level of the oil tank is more than 2700mm, the oil pump is unloaded and operated. And if the loading and unloading of the hydraulic pump fails, reporting the fault of the hydraulic pump, and performing main pump switching.

As shown in fig. 4, the specific steps are as follows:

step 18: the hydraulic system is running, and the P1 (P2) pump is running. And comparing the pressure of the hydraulic system, the oil level sampling value of the oil tank and the fixed value in real time. If the system pressure is less than 6.1MPa or the oil level of the pressure oil tank is less than 2000mm, executing the next step; if the system pressure is more than 6.3MPa or the oil level of the pressure oil tank is more than 2700mm, the step 20 is skipped.

Step 19: and (3) loading the P1 (P2) pump, and judging whether the P1 (P2) pump is loaded successfully or not. If the P1 (P2) pump is loaded successfully, jumping to the step 1; if P1 (P2) pump loading fails, the process jumps to step 21.

Step 20: p1 (P2) pump unloading order, judge whether P1 (P2) pump uninstallation succeeds. If P1 (P2) pump unloading is successful, jumping to the step 1; if P1 (P2) pump unloading fails, the next step is performed.

Step 21: and (4) alarming that the P1 (P2) pump fails to be available, and starting the main pump switching control flow.

Wherein, the auxiliary loading control flow of the hydraulic system:

and when the hydraulic system is in normal operation, the system pressure is maintained through the loading and unloading control of the small pump. If the system pressure is too low, the loading operation is assisted by a large pump, and the hydraulic system is rapidly pressurized to the rated working pressure.

As shown in fig. 5, the specific steps are as follows:

step 22: and the hydraulic system is in an operating state. And comparing the pressure of the hydraulic system with the fixed value in real time. If the system pressure is more than 6.1MPa, executing the next step; if the system pressure is less than 5.8MPa, jumping to the step 3; if the hydraulic system pressure is less than 5.5MPa, the process jumps to step 25.

Step 23: if the number of operating oil pumps is more than 1, unloading and stopping a large pump, and jumping to the step 22.

Step 24: if the number of the operating pumps is less than 2, a large pump is started for loading operation, and the step 22 is skipped.

Step 25: if the number of the operating pumps is less than 3, a large pump is started for loading operation, and the step 22 is skipped.

Wherein, the dehumidification control flow of the oil pump motor:

when the speed regulator hydraulic system normally operates, the system pressure is maintained through the loading and unloading control of the small pump, and the large pump is in a stop state for a long time. When the hydraulic system is shut down for a long time, all oil pumps are in a shut down state for a long time. The oil pump motor will be wet when not running for a long time, and the motor insulation is lowered, causing equipment damage. The oil pump motor is dehumidified regularly through flow control, so that the motor is prevented from being wetted to damage equipment. The control flow is as follows:

the automatic mode of the oil pressing pump has no fault alarm, the continuous pump stop time reaches 168 hours, the pump is started, the continuous pump stop time is cleared when the pump is started successfully, the pump is stopped after the pump is operated for 1 hour, and the continuous pump stop time is restarted to count. And if the pump is started and fails, the pump fails, and the oil pump fails to dehumidify.

As shown in fig. 6, the specific steps are as follows:

step 26: the fault-free alarm of the pressure oil pump P1 (P2P 3P 4) and the mode of automatic are adopted, and the continuous stop time and the fixed value of the pressure oil pump P1 (P2P 3P 4) are compared in real time. If the continuous shutdown time is greater than 168 hours, the next step is performed.

Step 27: the hydraulic pump P1 (P2P 3P 4) is started, and whether the hydraulic pump P1 (P2P 3P 4) is started successfully is judged. If the start of the oil pump P1 (P2P 3P 4) is successful, executing the next step; if the start-up of the oil pump P1 (P2P 3P 4) fails, the process goes to step 30.

Step 28: the continuous running time of the oil pressing pump P1 (P2P 3P 4) is cleared, the time is delayed for 1h, and the next step is executed.

Step 29: the pump P1 (P2P 3P 4) is stopped, the pump continuous off time starts to count, and the process goes to step 26.

Step 30: and (3) alarming that the fault of the pressure oil pump P1 (P2P 3P 4) is unavailable and the dehumidification of the pressure oil pump P1 (P2P 3P 4) is failed, and ending the flow.

The invention designs an oil pump motor unit composed of two large pumps and two small pumps, which provides stable pressure oil source for a speed regulation system through specific flow control, and simultaneously reduces energy consumption and cost; the oil pressing pump automatically rotates and dehumidifies regularly, so that the safe and stable operation of the equipment is ensured.

Claims (10)

1. The utility model provides a large-scale hydraulic generator speed governing system oil device, its characterized in that includes speed regulator main oil pipe, pressure oil tank, oil return tank, oil cooler and static oil filter, pressure oil tank connects the end at speed regulator main oil pipe, and pressure oil tank is connected with the gas pitcher that pressurizes for pressure oil tank, and parallel connection has a plurality of group miniwatt oil system and high-power oil system on the speed regulator main oil pipe, miniwatt oil system comprises loading and unloading valves, oil filter and micropump series connection, high-power oil system comprises loading and unloading valves, oil filter and micropump series connection, micropump and micropump all insert the oil return case, the oil return case is connected with each loading and unloading valves respectively, the oil cooler sets up between oil return tank and loading and unloading valves, the static oil filter is installed on the oil return tank.

2. A large hydraulic generator speed regulation system oil pressing device as claimed in claim 1, wherein the power range of the small pump is 10-60 kw, and the power range of the large pump is 120-200 kw.

3. The hydraulic oil device of a speed regulating system of a large hydraulic generator as set forth in claim 1, wherein two small pumps are provided, P1 and P2 respectively, and two large pumps are provided, P3 and P4 respectively.

4. A control method for a speed regulating system of a large hydraulic generator by using the hydraulic oil device as claimed in claims 1 to 3, comprising the following steps:

when the hydraulic system is in a stop state and a remote starting condition is met, after a monitoring hydraulic system is started, a big pump is started to load and operate, after the system pressure rises to a rated working pressure, the pump is unloaded, a small pump is started to operate, the big pump is stopped, the pressure of the hydraulic system is maintained at the rated working pressure through the loading and unloading control of the small pump, the normal operation of a speed regulator is ensured, the two big pumps are not available, the monitoring command is sent to stop the hydraulic system, the big fault of the hydraulic system is reported, the two small pumps are not available, the state of the big pump is judged, the two big pumps are available, the fault of the hydraulic system is reported, the current big pump is kept to operate, the normal operation of the speed regulator hydraulic system is maintained through the loading and unloading control of the big pump, otherwise, the command is monitored, and the big fault of the hydraulic system is reported;

performing rotation control on the main operation pump, switching the main operation pump when the continuous operation time of the main operation pump reaches 72 hours or the main operation pump fails, starting the other small pump, stopping the original operation pump after successful starting, reporting the failure after the failure of starting, and maintaining the operation of the original main pump after the failure of switching the main pump, and starting any large pump after the failure of both small pumps;

when the hydraulic system is operated, the pressure of the hydraulic system and the oil level of the oil tank are maintained in a normal working range through the loading and unloading control of the current operating pump, when the pressure of the system is smaller than the rated working pressure or the oil level of the oil tank is smaller than 2000mm, the oil pump is loaded and operated, when the pressure of the system is larger than the rated working pressure or the oil level of the oil tank is larger than 2700mm, the oil pump is unloaded and operated, if the loading and unloading of the oil pump fails, the oil pump is reported to be failed, and the main pump is switched;

when the hydraulic system normally operates, the system pressure is maintained through the loading and unloading control of the small pump, and if the system pressure is too low, the auxiliary loading operation of the large pump is needed, so that the hydraulic system is rapidly pressurized to the rated working pressure;

when the hydraulic system of the speed regulator normally operates, the system pressure is maintained through the loading and unloading control of the small pump, the large pump is in a stop state for a long time, when the hydraulic system stops operating for a long time, all the oil pumps are in the stop state for a long time, the oil pump motor is dehumidified regularly through flow control, the oil pump is in an automatic mode, no fault alarm is given, the continuous stop time of the large pump reaches 168 hours, the large pump is started, the continuous stop time of the large pump is cleared when the large pump is started successfully, the large pump is stopped after the large pump operates for 1 hour, the continuous stop time of the large pump is restarted to count time, the large pump is started failure, and the oil pump is failed in dehumidification.

5. The method of claim 4, wherein the remote starting conditions of the hydraulic system include an in-situ control mode of the hydraulic system, a main failure of the hydraulic system, an excessively low pressure of the pressure oil tank, an excessively low liquid level of the pressure oil tank and an excessively low liquid level of the return oil tank, and the hydraulic system cannot be started remotely if any of the conditions is satisfied.

6. The method for controlling the oil pump of the speed regulating system of the large hydraulic generator as set forth in claim 4, wherein the method for controlling the switching of the small pump after the loading operation of the large pump is started comprises the following steps:

step 1, a speed regulator hydraulic system receives a monitoring hydraulic system starting command, judges whether a hydraulic system starting condition is met, if so, executes the next step, and if not, jumps to step 11;

step 2, comparing the accumulated running time of the two pumps P3 and P4, taking the shorter time, starting the pump P3 or P4, and executing the next step;

step 3, judging whether the P3 or P4 pump is started successfully, if the P3 or P4 pump is started successfully, executing the next step, and if the P3 or P4 pump is started successfully, jumping to the step 5;

step 4, loading the P3 or P4 pump, judging whether the P3 or P4 pump is loaded successfully, if the P3 or P4 pump is loaded successfully, comparing the system pressure Y1 with a set value in real time, if Y1 is smaller than the rated working pressure, the P3 or P4 pump keeps loading operation, if Y1 is larger than the rated working pressure, jumping to step 7, if the P3 or P4 pump fails to load, stopping the pump P3 or P4, and executing the next step;

step 5, alarming that the P3 or P4 pump fails to be available, starting the other big pump P4 or P3, judging whether the P4 or P3 pump is started successfully, if the P4 or P3 pump is started successfully, executing the next step, and if the P4 or P3 pump is started successfully, alarming that the two big pumps P3 and P4 fail to be available, and jumping to the step 11;

step 6, loading the P4 or P3 pump, judging whether the P4 or P3 pump is loaded successfully, if the P4 or P3 pump is loaded successfully, comparing the system pressure Y1 with a set value in real time, if Y1 is smaller than the rated working pressure, the P4 or P3 pump keeps loading operation, and if Y1 is larger than the rated working pressure, executing the next step;

step 7, comparing the accumulated running time of the two small pumps P1 and P2 when the pump P3 or P4 is currently running, starting the pump P1 or P2 when the time is shorter, and executing the next step;

step 8, judging whether the P1 or P2 pump is started successfully, if the P1 or P2 pump is started successfully, executing the next step, if the P1 or P2 pump is started successfully, alarming that the P1 or P2 pump is not available, starting the other small pump P2 or P1, judging whether the P2 or P1 pump is started successfully, if the P2 or P1 pump is started successfully, executing the step 9, if the P2 or P1 pump is started successfully, alarming that the two small pumps P1 and P2 are not available, and jumping to the step 10;

step 9, stopping the current running of the big pump P3 or P4, completing the starting of the hydraulic system, and ending the flow;

step 10, judging the states of the two big pumps P3 and P4, if the two big pumps P3 and P4 have no faults, keeping the running of the big pump P3 or P4 currently running, finishing the starting of the hydraulic system, ending the flow, and if any fault of the P3 and P4 is not available, executing the next step;

and step 11, alarming the large fault of the hydraulic system, stopping the hydraulic system, and ending the flow.

7. The method for controlling the oil pump of the speed regulating system of the large hydraulic generator as set forth in claim 4, wherein the main pump switching control method comprises the steps of:

step 12, operating the P1 or P2 pump in a hydraulic system operation state, if the P1 or P2 pump fails, alarming that the P1 or P2 pump fails, executing the next step, if the P1 or P2 pump operates normally, comparing the continuous operation time of the P1 or P2 pump with a fixed value in real time, if the continuous operation time is less than 72h, keeping the P1 or P2 pump to operate, and if the continuous operation time is more than or equal to 72h, executing the next step;

step 13, a main pump reversing command is sent out, a P2 or P1 pump is started, whether the P2 or P1 pump is started successfully is judged, if the P2 or P1 pump is started successfully, the next step is executed, if the P2 or P1 pump is started successfully, the alarm that the P2 or P1 pump is unavailable is given, and the step 15 is skipped;

step 14, stopping the P1 or P2 pump, finishing the main pump switching, and ending the flow;

step 15, judging whether the faults of the two small pumps P1 and P2 are unavailable, if yes, executing the next step; if not, jumping to the step 17;

step 16, starting a big pump P3 or P4 to run, alarming the main pump switching failure, and ending the flow;

and step 17, maintaining the operation of the original main pump P1 or P2, alarming the failure of main pump switching, and ending the flow.

8. The method for controlling the pressure oil pump of the speed regulating system of the large hydraulic generator as set forth in claim 4, wherein the method for controlling the loading and unloading of the pressure oil pump comprises the steps of:

step 18, the operation state of the hydraulic system, the operation of the P1 or P2 pump, the real-time comparison of the pressure of the hydraulic system and the oil level sampling value and the fixed value of the oil tank, if the system pressure is smaller than the rated working pressure or the oil level of the oil tank is smaller than 2000mm, the next step is executed, and if the system pressure is larger than the rated working pressure or the oil level of the oil tank is larger than 2700mm, the step 20 is skipped;

step 19, loading the P1 or P2 pump, judging whether the P1 or P2 pump is loaded successfully, if the P1 or P2 pump is loaded successfully, jumping to step 1, and if the P1 or P2 pump is loaded failed, jumping to step 21;

step 20, unloading the P1 or P2 pump, judging whether the P1 or P2 pump is successfully unloaded, if the P1 or P2 pump is successfully unloaded, jumping to the step 1, and if the P1 or P2 pump is failed to be unloaded, executing the next step;

and step 21, alarming that the P1 or P2 pump fails to be available, and starting a main pump switching control flow.

9. The method for controlling the oil pump of the speed regulating system of the large hydraulic generator as claimed in claim 4, wherein the method for controlling the auxiliary loading of the hydraulic system comprises the following steps:

step 22, comparing the pressure of the hydraulic system with a fixed value in real time, if the pressure of the hydraulic system is larger than the rated working pressure, executing the next step, if the pressure of the hydraulic system is smaller than the rated working pressure, jumping to step 24, and if the pressure of the hydraulic system is smaller than the rated working pressure, jumping to step 25;

step 23, if the number of the operating oil pumps is more than 1, unloading and stopping a large pump, and jumping to the step 22;

step 24, if the number of the operating pumps is less than 2, starting a big pump to load and operate, and jumping to the step 22;

and step 25, if the number of the operating pumps is less than 3, starting a big pump to load and operate, and jumping to the step 22.

10. The method for controlling the oil pump of the speed regulating system of the large-scale hydraulic generator as claimed in claim 4, wherein the method for controlling the dehumidification of the oil pump motor comprises the following steps:

step 26, the fault-free alarm of the pressure oil pump P1, P2, P3 or P4 and the automatic mode are adopted, the continuous shutdown time and the fixed value of the pressure oil pump P1, P2, P3 or P4 are compared in real time, and if the continuous shutdown time is more than 168 hours, the next step is executed;

step 27, starting the oil pump P1, P2, P3 or P4, judging whether the oil pump P1, P2, P3 or P4 is started successfully, if the oil pump P1, P2, P3 or P4 is started successfully, executing the next step, if the oil pump P1, P2, P3 or P4 is failed to start, jumping to step 30;

step 28, resetting the continuous running time of the pressure oil pump P1, P2, P3 or P4, delaying for 1h, and executing the next step;

29, stopping the pump of the pressure oil pump P1, P2, P3 or P4, starting timing the continuous pump stop time, and jumping to the step 26;

and 30, alarming that the fault of the oil pressing pump P1, P2, P3 or P4 is unavailable and that the dehumidification of the oil pressing pump P1, P2, P3 or P4 is failed, and ending the flow.