CN110593966B - Method and device for testing dead zone of regulating valve of steam turbine of nuclear power station - Google Patents
Method and device for testing dead zone of regulating valve of steam turbine of nuclear power station Download PDFInfo
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- CN110593966B CN110593966B CN201910740251.6A CN201910740251A CN110593966B CN 110593966 B CN110593966 B CN 110593966B CN 201910740251 A CN201910740251 A CN 201910740251A CN 110593966 B CN110593966 B CN 110593966B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/003—Arrangements for testing or measuring
Abstract
The invention belongs to the technical field of regulating systems of steam turbines of nuclear power plants, and particularly relates to a method and a device for testing dead zones of regulating valves of steam turbines of nuclear power plants. The dead zone test method for the regulating valve of the steam turbine of the nuclear power station sets the working mode of the control clamping piece to be an open-loop control mode and sets the valve position of the regulating valve to be in a fully-open state; and then sequentially inputting N input instructions with gradually-reduced range to the control clamping piece, testing based on the N input instructions, forming a valve position closing curve based on the range of the output instructions acquired in the testing process and the valve position range of the regulating valve, and determining the target dead zone compensation of the control clamping piece corresponding to the closing direction of the regulating valve based on the valve position closing curve so as to accurately control the valve position when the regulating valve is closed according to the accurate target dead zone compensation, thereby avoiding the situations of overshoot and hydraulic impact.
Description
Technical Field
The invention relates to the technical field of regulating systems of steam turbines of nuclear power plants, in particular to a method and a device for testing dead zones of regulating valves of steam turbines of nuclear power plants.
Background
In a steam turbine regulating system of an existing nuclear power station, a proportional valve is used for controlling a regulating valve to be closed, however, in the closing process of the regulating valve, the valve position range of the actual closing of the regulating valve is more than the valve position range of the expected closing range, so that the regulating valve is out of order and hydraulic impact is caused, an oil pipe is broken, and a sealing element of an oil engine is damaged to leak oil. However, overshoot is a phenomenon in which the valve position range in which the control valve is actually closed is larger than the valve position range in which the user expects to close, and for example, the original valve position of the control valve is 40% closed, and it is desired to set the valve position of the control valve to 50% closed by an input command, but actually, the valve position of the control valve is set to 80% closed by an input command.
Disclosure of Invention
The embodiment of the invention provides a method and a device for testing a dead zone of a regulating valve of a steam turbine of a nuclear power station, and aims to solve the problems of regulating valve overshoot and hydraulic impact caused in the closing process of the regulating valve.
A method for testing a dead zone of a regulating valve of a steam turbine of a nuclear power station comprises the following steps:
setting the working mode of the control clamping piece into an open-loop control mode, and setting the valve position of the regulating valve into a fully-open state;
sequentially inputting N input instructions with gradually-reduced measuring range to the control clamping piece, testing based on the N input instructions, and forming a valve position closing curve based on the measuring range of the output instructions and the valve position measuring range of the regulating valve obtained in the testing process;
and determining the target dead zone compensation of the control clamping piece corresponding to the closing direction of the regulating valve based on the valve position closing curve.
A nuclear power station steam turbine governing valve dead zone testing arrangement includes:
the control unit is used for setting the working mode of the control clamping piece into an open-loop control mode and setting the valve position of the regulating valve into a fully-open state;
the test unit is used for sequentially inputting N input instructions with gradually-reduced ranges to the control clamping piece, carrying out test based on the N input instructions, and forming a valve position closing curve based on the range of the output instruction and the valve position range of the regulating valve obtained in the test process;
and the target dead zone compensation determining unit is used for determining the target dead zone compensation of the control clamping piece corresponding to the closing direction of the regulating valve based on the valve position closing curve.
According to the method and the device for testing the dead zone of the regulating valve of the steam turbine of the nuclear power station, the working mode of the control clamping piece is set to be the open-loop control mode, and the valve position of the regulating valve is controlled to be in the fully-open state, so that manual control input instructions are realized, and the test is convenient. The method comprises the steps of sequentially inputting N input instructions with gradually-reduced range to a control clamping piece, testing based on the N input instructions, forming a valve position closing curve based on the range of the output instructions acquired in the testing process and the valve position range of an adjusting valve, visually displaying the relationship between the range of the output instructions and the valve position range of the adjusting valve through the valve position closing curve, and determining target dead zone compensation of the control clamping piece corresponding to the closing direction of the adjusting valve based on the valve position closing curve so as to accurately control the valve position range of the adjusting valve to be closed according to the target dead zone compensation, thereby avoiding the situations of overshoot and hydraulic impact of the adjusting valve.
Drawings
FIG. 1 is a schematic diagram of a dead zone testing device for a regulating valve of a steam turbine of a nuclear power plant according to an embodiment of the invention;
FIG. 2 is a flow chart illustrating a dead zone testing method for a regulating valve of a steam turbine of a nuclear power plant according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a turbine adjustment system in accordance with an embodiment of the present invention;
FIG. 4 is a schematic diagram of a regulator valve control according to an embodiment of the present invention;
FIG. 5 is a functional schematic of a proportional valve according to an embodiment of the present invention;
FIG. 6 is a graph illustrating valve position closure according to an embodiment of the present invention;
FIG. 7 is a schematic illustration of dead band compensation;
FIG. 8 is a schematic diagram of the proportional valve with the A port blocked from both the P port and the T port;
FIG. 9 is a schematic diagram of the flow of motive oil from port A to port T in the proportional valve;
FIG. 10 is another flow chart illustration of a method for dead band testing of a nuclear power plant steam turbine regulating valve in accordance with an embodiment of the present invention;
FIG. 11 is another flow chart illustration of a method for dead band testing of a turbine regulator valve in a nuclear power plant according to an embodiment of the present invention;
FIG. 12 is another flow chart illustration of a method for dead band testing of a nuclear power plant steam turbine regulator valve in accordance with an embodiment of the present invention;
fig. 13 is a schematic block diagram of a dead zone testing device for a regulating valve of a steam turbine in a nuclear power plant according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The method for testing the dead zone of the regulating valve of the steam turbine of the nuclear power station, provided by the embodiment of the invention, is applied to a device for testing the dead zone of the regulating valve of the steam turbine of the nuclear power station, shown in figure 1. Specifically, the device for testing the dead zone of the regulating valve of the steam turbine of the nuclear power station comprises a control clamping piece and a servomotor, wherein the servomotor comprises a proportional valve and a regulating valve.
According to the embodiment of the invention, the range of the output instruction of the control clamping piece and the corresponding valve position range of the regulating valve are recorded to form a closed valve position curve in the closing process of the regulating valve, and the target dead zone compensation of the control clamping piece is obtained according to the closed valve position curve, so that the target dead zone compensation of the control clamping piece is reasonably set, the valve position range of the regulating valve closing can be accurately controlled in the subsequent process, and the phenomena of overshooting and hydraulic impact of the regulating valve are avoided.
As shown in fig. 2, the embodiment provides a method for testing a dead zone of a regulating valve of a steam turbine in a nuclear power plant, which includes:
s201, setting the working mode of the control clamping piece into an open-loop control mode, and setting the valve position of the regulating valve into a full-open state.
The open-loop control mode is to set the working mode of the control card to be a manual control mode and manually change an input instruction input into the control card so as to measure the target dead zone compensation.
Specifically, the working mode of controlling the fastener is the open-loop control mode, and the manual work changes the input instruction of input control fastener to realize that the valve position of accurate control governing valve closing in-process governing valve changes, avoid appearing the phenomenon of overshoot, control the valve position of governing valve for full open state simultaneously, so that the valve position range of governing valve changes when the follow-up test governing valve is closed.
S202, sequentially inputting N input instructions with gradually-reduced measuring range to the control clamping piece, testing based on the N input instructions, and forming a valve position closing curve based on the measuring range of the output instructions and the valve position measuring range of the regulating valve obtained in the testing process.
The input instruction is an instruction for inputting the control card, and the operating mode of the control card is an open-loop control mode, so the input instruction is an instruction manually input. The output instruction refers to an instruction which is output after the input instruction is processed by the control clamping piece, and the output instruction is used for driving the valve core of the proportional valve to move.
Specifically, the input command and the output command are in a proportional relationship, that is, as the range of the input command is gradually reduced, the range of the output command is gradually reduced. In this embodiment, one input command corresponds to one output command, and then the output command drives the valve core of the proportional valve to move, and as the range of the input command gradually decreases, the range of the output command gradually decreases, and the movement direction of the valve core of the proportional valve moves from the working oil port a to the oil return port T as shown in fig. 8 and 9, so that the regulating valve is closed.
As shown in fig. 3, in the conventional turbine regulating system, dead zone of the spool of the proportional valve and dead zone compensation of the control card in the turbine regulating system are determined according to the spool design of the proportional valve. However, the phenomena of the overshoot and the hydraulic impact of the regulating valve occur in the actual closing process of the regulating valve, so that the sealing part of the hydraulic machine in the regulating system of the steam turbine is damaged, and oil leakage is caused.
In the case of combining fig. 7 and 8, the dead zone of the spool is in the design of the proportional valve, and in order to ensure the stability of the control, there is a cover in the vicinity of the middle position of the spool of the proportional valve, where the cover is the dead zone of the spool of the proportional valve. This amount of cover typically accounts for 20% -40% of the proportional valve spool.
The valve core dead zone design has the effects of reducing zero leakage of the proportional valve and providing greater safety for cutting off oil supply when the valve is closed emergently. But for the control of the intermediate valve position, the control sensitivity is sacrificed.
In a turbine regulating system, dead band compensation is provided in order to overcome the effect of this dead band. As long as the input command reaches the minimum resolution voltage (80mV) of the control clamping piece, the output command of the control clamping piece immediately jumps from 0 to a larger value (the value is called dead zone compensation, the opening direction of the regulating valve is called BMA, and the closing direction of the regulating valve is called BMB) so as to drive the valve core of the proportional valve to immediately act and jump over the cover, thereby achieving the purpose of overcoming the cover.
Tests show that the cause of the overshoot and the hydraulic shock is the excessive dead zone compensation setting.
With reference to fig. 3, 4, 8 and 9, the reason for causing the hydraulic shock is that when the proportional valve receives an output command, the spool moves from the working oil port to the oil return port, and because the dead zone compensation is too large, the output command generated by the input command through the dead zone compensation processing of the control fastener is too large, at this time, the proportional valve drives the spool to rapidly overcome the dead zone according to the too large output command, so that the regulating valve reaches the fast closing point, so that the regulating valve is rapidly closed, but the turbine regulating system monitors that the valve position of the regulating valve is too large, and then performs load feedback and regulating valve position feedback, so as to expect to open the large regulating valve to the expected valve position, and therefore, after the load feedback and the regulating valve position feedback, the spool of the proportional valve rapidly moves to the opposite direction, that is, the spool of the proportional valve moves from the oil port T to the working oil port a, the power oil rapidly passes through the oil pipe, and enters the oil from the proportional valve to the oil cylinder piston, the regulating valve is opened to the expected valve position in an expected manner, and the valve position of the regulating valve continuously and repeatedly closes and opens, so that oil pressure impact is generated, oil pipes are cracked, and oil leakage of oil motor sealing parts is damaged.
Therefore, in this embodiment, the schematic structural diagram of the nuclear power plant steam turbine regulating valve dead zone testing apparatus shown in fig. 1 is adopted to test the change conditions of the valve position range of the regulating valve closing and the range of the output instruction in the regulating valve closing process, so as to obtain a valve position closing curve, and determine reasonable target dead zone compensation according to the valve position closing curve, thereby ensuring that the valve position range of the regulating valve closing can be accurately controlled, and avoiding hydraulic shock and overshoot. Specifically, the range of the output instruction is between +10V and-10V, when the output instruction is set to be +10V, the regulating valve is fully opened, then a knob on the control clamping piece is slowly rotated to generate N input instructions with gradually reduced range, the input instructions are processed by the control clamping piece to generate the output instruction, the proportional valve drives a valve core of the proportional valve to move from a working oil port to an oil return port according to the output instruction, understandably, along with the reduction of the input instruction, the range of the output instruction is reduced from +10V to-10V, the regulating valve is gradually closed, the range of the output instruction in the test process and the corresponding valve position range of the regulating valve are obtained to form a valve position closing curve, the valve position closing curve visually displays the relationship between the range of the instruction and the valve position range of the regulating valve, and then the target dead zone compensation of the control clamping piece is determined according to the valve position closing curve, the control method is used for accurately controlling the closing of the regulating valve and avoiding hydraulic impact and overshoot in the closing process of the regulating valve.
The working principle of the regulating valve and the proportional valve is explained below with reference to fig. 4 and 5.
The proportional valve has four oil ports, P is a power oil port, A and B are working oil ports, and T is an oil return port. In the embodiment, the working oil port only uses the port A, the port A can be communicated with an oil cavity of the piston of the servomotor, and the port B is blocked.
The oil-driven machine mainly comprises a proportional valve (EVP), an Electromagnetic Valve (EVS), a quick unloading valve (CVP) controlled by the electromagnetic valve and a cylinder piston. The structure of the servomotor is not described in detail herein for the prior art.
The slow closing process of the proportional valve: if the input command has a slow descending speed, the proportional valve spool moves to the right for a short distance, the port P is not communicated with the port A, the port A is not communicated with the port T, and the valve of the regulating valve is slowly closed due to normal leakage of the piston of the oil engine.
If the valve core of the proportional valve moves to the right for a long distance, the port A is communicated with the port T, but the oil quantity is small, and the valve of the regulating valve is also closed slowly.
Proportional valve fast closing process: the input command is gradually reduced, the rightward movement distance of the valve core of the proportional valve is further increased, and the A port and the T port are kept in a large opening degree. The power oil of the piston of the servomotor is drained to the T port through the port A of the proportional valve in a large amount, differential pressure is formed in front of and behind the throttle port N004, the CVP of the quick unloading valve is quickly opened due to the differential pressure, the power oil of the piston of the servomotor is drained through the CVP in a large amount, and the regulating valve is quickly closed.
And S203, determining the target dead zone compensation of the control clamping piece corresponding to the closing direction of the regulating valve based on the valve position closing curve.
The dead zone compensation means that when an input command reaches the minimum resolution voltage (80mV) of the control card, the measuring range of an output command of the control card jumps from 0V to a larger value, and the value is the dead zone compensation.
Specifically, the valve position closing curve is shown in fig. 6, and it can be obviously seen from fig. 6 that the output command of the BC section is a step change, but this embodiment is to test the dead zone compensation of the closing direction of the regulating valve, so according to the definition of the dead zone compensation, the target dead zone compensation of the control fastener corresponding to the closing direction of the regulating valve can be quickly determined from the valve position closing curve, that is, the point C corresponding to the range of the output command, and then the original dead zone compensation can be set as the target dead zone compensation on the control fastener, so that the valve position range for accurately controlling the closing of the regulating valve can be realized according to the accurate target dead zone compensation, and the situations of overshoot of the regulating valve and hydraulic shock can be avoided.
In the method for testing the dead zone of the regulating valve of the steam turbine of the nuclear power station, the working mode of the control clamping piece is set to be the open-loop control mode, and the valve position of the regulating valve is set to be in the fully-open state, so that manual control input instructions are realized. The method comprises the steps of sequentially inputting N input instructions with gradually-reduced input ranges to the control clamping piece, testing based on the N input instructions, forming a valve position closing curve based on the range of the output instructions acquired in the testing process and the valve position range of the regulating valve, determining target dead zone compensation of the control clamping piece corresponding to the closing direction of the regulating valve based on the valve position closing curve, and controlling the valve position range of the regulating valve to be closed according to the accurate target dead zone compensation to avoid overshooting of the valve of the regulating valve and cause hydraulic impact.
In one embodiment, as shown in fig. 10, the step S202 of performing a test based on N input commands, and forming a valve position closing curve based on a range of an output command obtained during the test and a valve position range of the regulating valve, includes:
s1001: and sequentially carrying out original dead zone compensation processing on the N input instructions to control the clamping piece to obtain corresponding output instructions, and sending the output instructions to the proportional valve.
The original dead-zone compensation refers to setting a threshold in advance for adjusting the input command, and in this embodiment, the input command is added to the original dead-zone compensation value to obtain the output command.
Specifically, during testing, a knob on the control clamping piece is slowly rotated to generate N input instructions with gradually-reduced measuring range, each input instruction is subjected to original dead zone compensation processing of the control clamping piece, namely, the input instruction and the original dead zone compensation are added to generate a corresponding output instruction, and the output instruction is sent to the proportional valve.
S1002: and the proportional valve receives an output instruction, and drives the valve core to move from the working oil port to the oil return port based on the output instruction so as to control the regulating valve to be closed.
The working oil port is a port in the proportional valve, which is communicated with the oil chamber of the piston of the servomotor, i.e., a port a in fig. 6. The oil return port is referred to as the T port in fig. 6.
Specifically, the proportional valve receives an output instruction, and drives the valve core to move from the working oil port to the oil return port based on the output instruction so as to control the regulating valve to be closed. It can be understood that, because the range of the input command is slowly reduced by adopting manual control, the range of the output command is also slowly reduced, so that the regulating valve is slowly closed, and the condition of hydraulic shock cannot exist.
S1003: and recording the range of the output instruction corresponding to the N input instructions and the valve position range of the regulating valve by using a high-precision recorder to form a valve position closing curve.
Specifically, a high-precision recorder is adopted to read the valve position of the regulating valve and the output instruction of the control clamping piece respectively so as to accurately record the range of the output instruction corresponding to the N input instructions and the valve position range of the regulating valve and form a valve position closing curve. With reference to fig. 4, 8 and 9, in the range of the output command and the forming process of the regulating valve, in the AB section of the output command, as the output command is slowly reduced, the proportional valve drives the valve core according to the output command to move from the working port a to the oil return port T, at this time, the amount of the power oil from the power port P to the working port a is reduced, but the amount of the oil is less than the leakage flow of the oil-driven piston, so that the regulating valve is slowly closed; slowly reducing the output command, wherein in a BC section of the output command, the BC section is changed into step reduction, because the output command is subjected to dead zone compensation; the output instruction is slowly reduced, in the CD section of the output instruction, the valve core of the proportional valve crosses the middle positions of the working oil port A and the oil return port T, at the moment, the working oil port A, the oil return port T and the power oil port P are not communicated, and the oil leakage of the piston of the servomotor continues to slowly descend; the output command is slowly reduced, and in the DE section of the output command, the port A and the port T of the valve core are communicated. However, the opening is small, the oil return amount is small, the differential pressure of the throttling opening N004 is low, the CVP is not opened, and the valve position of the regulating valve continues to slowly descend; and the output instruction is continuously and slowly reduced, after the point E, the opening A and the opening T of the valve core are larger, the oil return amount is large, the differential pressure of the throttling opening N004 is large, the CVP is opened, and the valve position is quickly reduced.
In the dead zone test method for the regulating valve of the steam turbine of the nuclear power station, provided by the embodiment, N input instructions are subjected to original dead zone compensation processing of a control clamping piece in sequence to obtain corresponding output instructions, and the output instructions are sent to a proportional valve; the proportional valve receives an output instruction, and drives the valve core to move from the working oil port to the oil return port based on the output instruction so as to control the regulating valve to be closed; and a high-precision recorder is adopted to accurately record the range of the output instruction corresponding to the N input instructions and the valve position range of the regulating valve to form a valve position closing curve, so that target dead zone compensation is determined according to the valve position closing curve in the following process, the regulating valve is accurately closed, and hydraulic impact is avoided.
In one embodiment, as shown in fig. 11, the step S203 of determining the target dead zone compensation of the control card corresponding to the closing direction of the regulating valve based on the valve position closing curve includes:
s1101: and acquiring a step change point corresponding to the range of the output instruction based on the valve position closing curve.
Specifically, as shown in the valve closing curve of fig. 7, in the BC section corresponding to the output command, the range of the output command is suddenly changed from point B to 0V and then to point C, because the output command crosses the dead zone compensation, the BC section appears as a step decrease, while the present embodiment is to test the target dead zone compensation (i.e., the BMB direction in fig. 6) when the regulating valve is closed, and therefore, the step change point of the closing direction of the regulating valve, i.e., the point C of the valve closing curve, is quickly obtained according to the valve closing curve.
S1102: and determining the step change point to control the target dead zone compensation of the clamping piece corresponding to the closing direction of the regulating valve.
Specifically, as long as the input command reaches the minimum resolution voltage (80mV) of the control card, the output command of the control card jumps from 0 to a larger value (this value is called dead zone compensation, the opening direction of the regulating valve is called BMA, and the closing direction of the regulating valve is called BMB.) immediately, so that the step change point, i.e. the point C of the valve position closing curve, is determined as the target dead zone compensation of the control card corresponding to the closing direction of the regulating valve, so that when the actual regulating valve is closed, the precise control of the closing of the regulating valve is realized according to the tested target dead zone compensation, and overshoot and hydraulic shock of the regulating valve are avoided. The target dead zone compensation refers to dead zone compensation in the closing direction of the regulating valve.
In the method for testing the dead zone of the regulating valve of the steam turbine of the nuclear power station, the step change point corresponding to the range of the output instruction is obtained based on the valve position closing curve, and the step change point is used for determining the target dead zone compensation of the control clamping piece corresponding to the closing direction of the regulating valve, so that the valve position for accurately controlling the closing of the regulating valve is realized according to the reasonable target dead zone compensation when the actual regulating valve is closed, and the conditions of overshoot of the regulating valve and hydraulic impact are avoided.
In an embodiment, as shown in fig. 12, after step S203, that is, after determining the target dead zone compensation of the control dog corresponding to the closing direction of the regulating valve based on the valve position closing curve, the method for testing the dead zone of the regulating valve of the nuclear power plant turbine further includes:
s1201: and acquiring a target valve position range corresponding to the starting of rapid closing of the regulating valve based on the valve position closing curve.
The target valve position range refers to the range of the corresponding valve position of the regulating valve when the regulating valve is rapidly closed.
Specifically, as shown in fig. 6, after the command D is output, the working oil port a and the oil return port T of the spool are connected, and at this time, the valve position of the regulating valve starts to be closed faster corresponding to the H point of the valve position of the regulating valve in fig. 6, and according to the dead zone definition (i.e., in the design of the proportional valve, in the vicinity of the middle position of the spool of the proportional valve, there is a cover at the oil port of the proportional valve, and the cover amount is also the spool dead zone of the proportional valve), the spool dead zone of the proportional valve may be located at the D point corresponding to the H point. However, it can be seen from the valve position closing curve that the change of the H inflection point is not the most obvious, and when the regulating valve is actually closed, what actually affects the overshoot is a point corresponding to the start of rapid closing of the valve of the regulating valve, that is, a point at which the CVP is opened.
S1202: and determining the range of the corresponding target output instruction based on the target valve position range.
Specifically, as shown in fig. 6, the range of the target output command corresponding to the target valve position range can be determined through the valve position closing curve, that is, the range of the target output command corresponding to the point I where the regulating valve starts to close quickly is E, so as to determine the valve element dead zone of the proportional valve in the following.
S1203: and determining a valve core dead zone corresponding to the proportional valve based on the target dead zone compensation and the target output command range.
Specifically, a valve core dead zone is determined according to the difference value between the absolute value of the range of the target output instruction and the absolute value of the target dead zone compensation, namely the valve core dead zone is equal to | E | - | C |, so that the regulation valve can be accurately and quickly closed according to the valve core dead zone in the following process, the sensitive regulation valve can be controlled to be closed, and the overshoot and hydraulic impact of the regulation valve can be avoided due to the fact that the target dead zone compensation of the control clamping piece is reasonable. Understandably, in the actual closing process of the regulating valve, the valve position of the regulating valve can be accurately closed according to the target dead zone compensation, so that the overshoot and hydraulic impact of the regulating valve are avoided; according to the target dead zone compensation and the valve core dead zone, the corresponding output instruction when the regulating valve is quickly closed can be determined, so that the corresponding output instruction when the regulating valve is quickly closed is used for subtracting the range of the target dead zone compensation, and the input instruction corresponding to the quick closing starting of the regulating valve is obtained, so that the quick closing of the regulating valve can be accurately realized.
In an embodiment, step S1203 specifically includes: and if the regulating valve is a high-pressure regulating valve, determining the dead zone range of the valve core dead zone corresponding to the proportional valve to be 0-0.1V based on the target dead zone compensation and the target output instruction range.
In another embodiment, step S1203 specifically includes: and if the regulating valve is a medium-pressure regulating valve, determining that the valve core dead zone corresponding to the proportional valve is 0.4V based on the target dead zone compensation and the target output command range.
It can be understood that, because the high pressure regulating valve and the medium pressure regulating valve cause the same reason of hydraulic impact, but the valve core dead zone setting ranges are different according to the functions of the turbine regulating system, the valve core dead zone of the high pressure regulating valve and the valve core dead zone of the medium pressure regulating valve are tested by sequentially utilizing the nuclear power station turbine regulating valve dead zone testing device.
In the method for testing the dead zone of the regulating valve of the steam turbine of the nuclear power station, based on a valve position closing curve, a target valve position range corresponding to the quick closing of the regulating valve is obtained, based on the target valve position range, the range of the corresponding target output instruction is determined, so that the valve core dead zone corresponding to the proportional valve is determined according to the target dead zone compensation and the range of the target output instruction, the regulation valve can be accurately and quickly closed according to the valve core dead zone, the closing of the sensitive regulating valve is controlled, and the hydraulic impact can be avoided due to the fact that the target dead zone compensation of the clamping piece is reasonable.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
In an embodiment, a dead zone testing device for a turbine regulating valve of a nuclear power plant is provided, and the dead zone testing device for the turbine regulating valve of the nuclear power plant corresponds to the dead zone testing method for the turbine regulating valve of the nuclear power plant in the above embodiment one to one. As shown in fig. 13, the dead zone test device for the regulating valve of the steam turbine in the nuclear power plant includes a control unit 1301, a test unit 1302, and a target dead zone compensation determining unit 1303. The functional modules are explained in detail as follows:
and the control unit 1301 is used for setting the working mode of the control clamping piece into an open-loop control mode and setting the valve position of the regulating valve into a fully-open state.
The test unit 1302 is configured to sequentially input N input instructions, of which the range gradually decreases, to the control card, perform a test based on the N input instructions, and form a valve position closing curve based on the range of the output instruction and the valve position range of the regulating valve, which are obtained in the test process.
And the target dead zone compensation determining unit 1303 is used for determining target dead zone compensation of the control clamping piece corresponding to the closing direction of the regulating valve based on the valve position closing curve.
Preferably, the test unit 1302 includes: the device comprises an input instruction processing subunit, a regulating valve closing subunit and a range recording subunit.
And the input instruction processing subunit is used for sequentially carrying out original dead zone compensation processing on the N input instructions to control the clamping piece to obtain corresponding output instructions, and sending the output instructions to the proportional valve.
And the regulating valve closing subunit is used for receiving the output instruction by the proportional valve and driving the valve core to move from the working oil port to the oil return port based on the output instruction so as to control the regulating valve to be closed.
And the range recording subunit is used for recording the range of the output instruction corresponding to the N input instructions and the valve position range of the regulating valve by adopting the high-precision recorder to form a valve position closing curve.
Preferably, the target dead zone compensation determining unit includes: the device comprises a step change point acquisition subunit and a target dead zone compensation determination subunit.
And the step change point acquisition subunit is used for acquiring a step change point corresponding to the range of the output instruction based on the valve position closing curve.
And the target dead zone compensation determining subunit is used for determining the step change point as the target dead zone compensation of the control clamping piece corresponding to the closing direction of the regulating valve.
Preferably, after the target dead zone compensation determining unit, the dead zone testing device for the regulating valve of the steam turbine in the nuclear power plant further comprises: the device comprises a target valve position range acquisition unit, an output instruction range determination unit and a valve core dead zone determination unit.
And the target valve position range obtaining unit is used for obtaining the target valve position range corresponding to the starting of the quick closing of the regulating valve based on the valve position closing curve.
And the output instruction range determining unit is used for determining the range of the corresponding target output instruction based on the target valve position range.
And the valve core dead zone determining unit is used for determining the valve core dead zone corresponding to the proportional valve based on the target dead zone compensation and the target output command range.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (8)
1. A method for testing a dead zone of a regulating valve of a steam turbine of a nuclear power station is characterized by comprising the following steps:
setting the working mode of the control clamping piece into an open-loop control mode, and setting the valve position of the regulating valve into a fully-open state;
sequentially inputting N input instructions with gradually-reduced measuring range to the control clamping piece, testing based on the N input instructions, and forming a valve position closing curve based on the measuring range of the output instructions and the valve position measuring range of the regulating valve obtained in the testing process;
determining target dead zone compensation of the control clamping piece corresponding to the closing direction of the regulating valve based on the valve position closing curve;
wherein, the target dead zone compensation of the control clamping piece corresponding to the closing direction of the regulating valve is determined based on the valve position closing curve, and the method comprises the following steps:
acquiring a step change point corresponding to the range of the output instruction based on the valve position closing curve;
and determining the range of the output instruction of the step change point as the target dead zone compensation of the control clamping piece corresponding to the closing direction of the regulating valve.
2. The method for testing the dead zone of the regulating valve of the steam turbine of the nuclear power plant according to claim 1, wherein the step of performing the test based on the N input commands and forming a valve position closing curve based on a range of the output commands and a valve position range of the regulating valve obtained in the test process comprises the following steps:
sequentially carrying out original dead zone compensation processing on the N input instructions to obtain corresponding output instructions, and sending the output instructions to a proportional valve;
the proportional valve receives the output instruction, and drives the valve core to move from the working oil port to the oil return port direction based on the output instruction so as to control the regulating valve to be closed;
and recording the range of the output instruction corresponding to the N input instructions and the valve position range of the regulating valve by using a high-precision recorder to form a valve position closing curve.
3. The method for testing the dead zone of the regulating valve of the steam turbine of the nuclear power plant according to claim 1, wherein after determining the target dead zone compensation of the control fastener corresponding to the closing direction of the regulating valve based on the valve position closing curve, the method for testing the dead zone of the regulating valve of the steam turbine of the nuclear power plant further comprises the following steps:
acquiring a target valve position range corresponding to the starting of rapid closing of the regulating valve based on the valve position closing curve;
determining the range of a corresponding target output instruction based on the target valve position range;
and determining a valve core dead zone corresponding to the proportional valve based on the target dead zone compensation and the target output command range.
4. The method for testing the dead zone of the regulating valve of the steam turbine of the nuclear power plant according to claim 3, wherein the step of determining the valve core dead zone corresponding to the proportional valve based on the target dead zone compensation and the target output command range comprises the following steps: and if the regulating valve is a high-pressure regulating valve, determining that the dead zone range of the valve core dead zone corresponding to the proportional valve is 0-0.1V on the basis of the target dead zone compensation and the target output instruction range.
5. The method for testing the dead zone of the regulating valve of the steam turbine of the nuclear power plant according to claim 3, wherein the step of determining the valve core dead zone corresponding to the proportional valve based on the target dead zone compensation and the target output command range comprises the following steps: and if the regulating valve is a medium-pressure regulating valve, determining that the valve core dead zone corresponding to the proportional valve is 0.4V based on the target dead zone compensation and the target output instruction range.
6. The utility model provides a nuclear power station steam turbine governing valve dead zone testing arrangement which characterized in that includes:
the control unit sets the working mode of the control clamping piece into an open-loop control mode and sets the valve position of the regulating valve into a fully-open state;
the test unit is used for sequentially inputting N input instructions with gradually-reduced ranges to the control clamping piece, carrying out test based on the N input instructions, and forming a valve position closing curve based on the range of the output instruction and the valve position range of the regulating valve obtained in the test process;
the target dead zone compensation determining unit is used for determining target dead zone compensation of the control clamping piece corresponding to the closing direction of the regulating valve based on the valve position closing curve;
wherein the target dead zone compensation determining unit includes:
a step change point obtaining subunit, configured to obtain, based on the valve position closing curve, a step change point corresponding to the range of the output instruction;
and the target dead zone compensation determining subunit is used for determining the target dead zone compensation of the control clamping piece corresponding to the closing direction of the regulating valve according to the step change point.
7. The nuclear power plant steam turbine regulating valve dead zone testing device according to claim 6, wherein the testing unit comprises:
the input instruction processing subunit is used for sequentially carrying out original dead zone compensation processing on the N input instructions through the control clamping piece to obtain corresponding output instructions, and sending the output instructions to the proportional valve;
the regulating valve closing subunit is used for receiving the output instruction by the proportional valve and driving the valve plug to move from the working oil port to the oil return port direction based on the output instruction so as to control the regulating valve to be closed;
and the range recording subunit is used for recording the ranges of the output instructions and the valve position range of the regulating valve corresponding to the N input instructions by adopting a high-precision recorder to form a valve position closing curve.
8. The nuclear power plant steam turbine regulating valve deadband test apparatus as recited in claim 6, wherein after the target deadband compensation determination unit, the nuclear power plant steam turbine regulating valve deadband test apparatus further comprises:
the target valve position range obtaining unit is used for obtaining a target valve position range corresponding to the starting of rapid closing of the regulating valve based on the valve position closing curve;
the output instruction range determining unit is used for determining the range of the corresponding target output instruction based on the target valve position range;
and the valve core dead zone determining unit is used for determining a valve core dead zone corresponding to the proportional valve based on the target dead zone compensation and the target output command range.
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| CN103696813B (en) * | 2013-12-20 | 2015-10-28 | 中广核核电运营有限公司 | Nuclear power plant's half speed turbine governor valve control fastener dead area compensation adjusting method |
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