A hydraulic turbine speed governor on / off automatic setting system

Abstract

The present invention discloses an automatic setting system for turning on and off a turbine speed governor, including a process structure composed of a bracket, a connecting mechanism, a closing limit adjustment nut, an opening limit adjustment nut, a main pressure distribution valve group, an emergency pressure distribution valve group, and a segmented closing valve group; and an automation system composed of a relay displacement signal meter, a main distribution displacement signal meter, a speed governor on and off electronic control system, and an on and off automatic adjustment human-machine interaction interface. The present invention automatically completes the automatic setting including the on and off time and the inflection point time, as well as the on and off characteristic online monitoring function by measuring and calculating the servomotor displacement and the main distribution displacement.

Description

Technical Field

[0001] The invention relates to the technical field of hydropower station automation, and in particular to an automatic setting system for turning on and off a turbine speed governor. Background Art

[0002] At present, the mainstream technical method of the turbine speed control system is the computer electro-hydraulic control method. A typical turbine speed governor system mainly includes: speed governor electrical cabinet system, speed governor mechanical cabinet system, human-machine interaction interface, oil pressure device system, relay, main pressure regulating valve group, electro-hydraulic converter, emergency pressure regulating valve group, segmented closing valve group, etc. The structure of the turbine speed governor system is complex, involving complex coordination of different systems and components. The turbine on / off time is an important parameter in the unit regulation guarantee calculation, and is an important indicator to ensure the safety and stability of the unit's large fluctuation transition process. The traditional turbine speed governor system on / off setting requires manual adjustment, which is time-consuming and labor-intensive, and the adjustment accuracy is low. And the system does not have the function of online monitoring of the on / off time. It is an important hidden danger that causes some units to fail to dump load and overspeed the unit. Summary of the invention

[0003] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a turbine governor automatic on / off adjustment system. Based on the traditional turbine governor system, the system automatically completes the automatic adjustment of the on / off time and the inflection point time, as well as the on / off characteristic online monitoring function by measuring and calculating the displacement of the servo and the main distribution.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A turbine speed governor on / off automatic setting system, comprising process equipment and an automation system;

[0006] The process equipment and system include a bracket, a connecting mechanism, a main pressure distribution valve group, an emergency pressure distribution valve group and a segmented closing valve group; the main pressure distribution valve group is connected to the bracket, and the connecting mechanism is connected to the valve core of the main pressure distribution valve group;

[0007] The automation system includes a relay displacement signal meter, a main distribution displacement signal meter, a speed regulator on / off electronic control system, and an on / off automatic adjustment human-machine interaction interface;

[0008] The displacement state of the valve core of the main pressure distribution valve group is sent to the governor switch motor electronic control system by the main distribution displacement signal meter through the connecting mechanism; the relay stroke is sent to the governor switch motor electronic control system by the relay displacement signal meter installed on the relay cylinder telescopic arm;

[0009] The speed governor switch motor electronic control system is connected to the emergency pressure regulating valve group through a signal cable. The emergency pressure regulating valve group is used to receive the action command issued by the speed governor switch motor electronic control system and feedback the action status to the speed governor switch motor electronic control system;

[0010] The speed governor switch motor electronic control system is connected to the segmented closing valve group through a signal cable. The segmented closing valve group is used to receive the action command issued by the speed governor switch motor electronic control system and feedback the action status to the speed governor switch motor electronic control system.

[0011] The on / off automatic adjustment human-machine interaction interface is connected with the speed regulator on / off electronic control system through a communication cable.

[0012] A further improvement of the present invention is that the process equipment and system also include a closing limit adjustment nut and an opening limit adjustment nut, and the closing limit adjustment nut and the opening limit adjustment nut are rigidly connected to the connecting mechanism and can move linearly in the same direction as the connecting mechanism.

[0013] A further improvement of the present invention is that the relay displacement change rate control is adopted, and the relay displacement signal meter and the main distribution displacement signal meter signals are used as feedback to automatically adjust the governor on / off time.

[0014] A further improvement of the present invention is that the system has an automatic power on and off adjustment human-computer interaction screen, an online monitoring and alarm screen, which can improve the intuitiveness of the power on and off time adjustment operation.

[0015] A further improvement of the present invention is that the power on and off automatic adjustment human-machine interaction interface has a zero position and full scale calibration interface, a mid-position calibration interface, a power on and off parameter setting interface, and an online monitoring and alarm interface.

[0016] A further improvement of the present invention is that the zero position and full scale calibration interface can calibrate the engineering quantity correspondence between the electrical zero position and electrical full scale of the servomotor displacement signal meter and the mechanical zero position and mechanical full scale of the servomotor after selecting the corresponding voltage or current type range.

[0017] A further improvement of the present invention is that the center position calibration interface can calibrate the engineering quantity correspondence between the electrical center position and the mechanical center position of the main displacement signal meter after selecting the corresponding adapter / range type.

[0018] A further improvement of the present invention is that the adapter / range types include: ±20mA; ±12V; ±24V.

[0019] A further improvement of the present invention is that the power on / off parameter setting interface can set four parameters Tg, Ts1, Ts2 and ag related to the adjustment guarantee calculation.

[0020] A further improvement of the present invention is that Tg and Ts1 are the first closing time; Ts2 is the second closing time; ag is the initial relative opening for closing; the initial relative opening ag represents the opening of the servomotor when the servomotor starts to close from the initial opening a0 position and reaches the inflection point position.

[0021] Compared with the prior art, the present invention has at least the following beneficial technical effects:

[0022] 1. The automatic setting system for turning on and off the turbine speed governor provided by the present invention fills a gap;

[0023] 2. The present invention provides an automatic setting online monitoring method not involved in the setting method of the turbine speed governor on / off;

[0024] 3. The present invention has the functions of measuring the displacement signal of the relay and the main distribution valve, the triggering action function of the emergency pressure distribution valve group and the segmented closing valve group, the governor on / off electronic control system and software. The displacement signal can be used to automatically set the governor on / off time;

[0025] 4. The present invention has a human-machine interaction screen for automatic adjustment of power on and off, online monitoring and alarm screen, which can improve the intuitiveness of the power on and off time adjustment operation;

[0026] 5. The present invention has online monitoring of power on and off characteristics and an alarm screen, which can improve the convenience and immediacy of operation and maintenance management. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the system of the present invention;

[0028] Figure 2 This is a schematic diagram of the main functions of the automatic adjustment of the human-machine interaction interface when turning the machine on and off according to the present invention;

[0029] Figure 3 This is the closing rule of the guide vanes of the unit in the present invention.

[0030] Description of reference numerals:

[0031] 1- bracket, 2- connecting mechanism, 3- closing limit adjustment nut, 4- opening limit adjustment nut, 5- main pressure distribution valve group, 6- emergency pressure distribution valve group, 7- segment closing valve group;

[0032] 1-01-Relay displacement signal meter, 1-02-Main distribution displacement signal meter, 1-03-Speed ​​regulator on / off electronic control system, 1-04-On / off automatic adjustment human-computer interaction interface. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only an embodiment of a part of the present invention, not all embodiments, and is not intended to limit the scope of the present invention. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concepts disclosed in the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work should belong to the scope of protection of the present invention.

[0034] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0035] like Figure 1 As shown, the present invention provides a turbine governor switch automatic adjustment system, including: a process structure composed of a bracket 1, a connecting mechanism 2, a closing limit adjustment nut 3, an opening limit adjustment nut 4, a main pressure distribution valve group 5, an emergency pressure distribution valve group 6 and a segmented closing valve group 7. And an automation system composed of a relay displacement signal meter 1-01, a main distribution displacement signal meter 1-02, a governor switch electronic control system 1-03 and a switch automatic adjustment human-machine interaction interface 1-04.

[0036] The displacement state of the valve core of the main pressure distribution valve group 6 is sent to the governor switch motor electronic control system 1-03 by the main distribution displacement signal meter 1-02 through the connecting mechanism 2. The relay stroke is sent to the governor switch motor electronic control system 1-03 by the relay displacement signal meter 1-01 installed on the relay cylinder telescopic arm.

[0037] The speed regulator on / off motor electronic control system 1-03 is connected to the emergency pressure regulating valve group 6 through a signal cable, and the emergency pressure regulating valve group 6 can receive the action command issued by the speed regulator on / off motor electronic control system 1-03. The emergency pressure regulating valve group 6 can feedback the action status to the speed regulator on / off motor electronic control system 1-03.

[0038] The speed governor switch motor electronic control system 1-03 is connected to the segmented closing valve group 7 through a signal cable, and the segmented closing valve group 7 can receive the action command issued by the speed governor switch motor electronic control system 1-03. The segmented closing valve group 7 can feedback the action status to the speed governor switch motor electronic control system 1-03.

[0039] The on / off automatic adjustment human-machine interaction interface 1-04 is connected to the speed regulator on / off electronic control system 1-03 via a communication cable.

[0040] like Figure 2The figure shows a schematic diagram of the human-machine interface of the automatic on / off adjustment system of a turbine speed governor of the present invention, including: a zero position and full scale calibration interface, a mid-position calibration interface, an on / off parameter setting interface, and an online monitoring and alarm interface.

[0041] After entering the zero position and full scale calibration interface and selecting the corresponding voltage or current type range, the corresponding relationship between the electrical zero position and electrical full scale of the servomotor displacement signal meter 1-01 and the mechanical zero position and mechanical full scale of the servomotor can be calibrated.

[0042] After entering the center position calibration interface and selecting the corresponding adapter / range type, the engineering quantity correspondence relationship between the electrical center position and the mechanical center position of the main displacement signal meter 1-02 can be calibrated.

[0043] The adapter / range types include: ±20mA; ±12V; ±24V.

[0044] Enter the power on / off parameter setting interface to set four parameters related to the adjustment guarantee calculation: Tg, Ts1, Ts2 and ag.

[0045] The Tg and Ts1 are the first closing time; Ts2 is the second closing time; ag is the initial relative opening degree of closing.

[0046] The closing initial relative opening ag represents the closing opening of the servomotor when the servomotor starts to close from the closing initial opening a0 (usually a0 is 100) to the inflection point.

[0047] like Figure 3 As shown, it is a schematic diagram of the unit guide vane closing law monitoring and alarm interface of a turbine speed governor on / off automatic tuning system of the present invention.

[0048] Figure 3 The black line in the middle represents the theoretical value of the adjustment guarantee calculation, which is generated by the adjustment guarantee calculation constant value entered in the switch parameter setting window. The black dotted line is the recorded value curve of the actual action process of the relay.

[0049] The speed regulator switch motor electronic control system 1-03 calculates and compares the closing time deviation, turning point deviation, and mechanical return deviation between the measured value (black dotted line) and the theoretical value (black line) through a fitting algorithm to see if they exceed the limit, and then gives an alarm reference.

[0050] Working principle of the present invention:

[0051] The invention discloses a turbine governor on-off automatic setting system. The governor servomotor and main distribution valve core displacement states are sent to the governor on-off electronic control system 1-03 through an external servomotor displacement signal meter 1-01 and a main distribution displacement signal meter 1-02.

[0052] The designed adjustment calculation constant is input into the speed regulator on / off electronic control system 1-03 through the on / off automatic adjustment human-machine interaction interface 1-04.

[0053] By automatically adjusting the human-machine interaction interface 1-04 in the power on / off machine, the zero position and full scale of the machine relay displacement signal meter 1-01 are calibrated to correspond to the engineering quantity between the zero position and full scale of the machine relay mechanical zero position and mechanical full scale. Figure 2 As shown, when the servomotor is in the fully closed position, the servomotor displacement signal meter 1-01 sensor measured value is 4mA, then 4mA is written into the speed regulator switch motor electronic control system 1-03 and defined as "servomotor opening 0%"; when the servomotor is in the fully open position, the servomotor displacement signal meter 1-01 sensor measured value is 20mA, then 20mA is written into the speed regulator switch motor electronic control system 1-03 and defined as "servomotor opening 100%"

[0054] The middle position and full scale calibration is operated by the automatic adjustment human-machine interaction interface 1-04 during the on / off operation. The main distribution middle position reference value K is set to 12mA. The middle position calibration is triggered, and the governor on / off electronic control system 1-03 automatically adjusts the main distribution valve core to the middle position by adjusting the sampling value of the main distribution displacement signal meter 1-02.

[0055] The quick closing calibration is performed by operating the human-machine interaction interface 1-04 for automatic adjustment of the switch. The relay is controlled by the speed regulator switch electronic control system 1-03 program to perform the relay displacement test under waterless conditions. The signal feedback of the relay displacement signal meter 1-01 is used as the controlled quantity. The speed regulator switch electronic control system 1-03 adopts the relay displacement change rate control according to the input closing time Ts1. Automatically calculate the main distribution displacement electrical quantity Mc corresponding to the closing time Ts1. Set Mc to the electrical upper limit of the main distribution valve closing direction in the automatic switch human-machine interaction interface 1-04, and tighten the closing limit adjustment nut 3 to complete the quick closing calibration.

[0056] The relay displacement change rate control. The relay displacement change rate instruction that meets the closing time Ts1 is generated by the speed regulator switch motor electronic control system 1-03 program. The relay displacement change rate instruction is used to control the relay displacement to meet the closing time Ts1.

[0057] The slow closing calibration is operated in the automatic adjustment human-machine interaction interface 1-04 of the on-off machine (this step is only for the units with staged closing requirements in the adjustment guarantee calculation requirements). The slow closing limit opening ai is automatically calculated by the speed governor on-off machine electronic control system 1-03. With ai as the initial relative opening for closing, the displacement change rate of the relay that meets the closing time Tg+Ts2 is calculated auxiliary. The slow closing calibration is assisted by the unit guide vane closing law in the unit guide vane closing law auxiliary window of the automatic adjustment human-machine interaction interface 1-04 of the on-off machine.

[0058] The quick-close calibration is performed by operating the human-machine interaction interface 1-04 for automatic adjustment of the switch. The relay is controlled by the electronic control system 1-03 of the speed regulator switch to perform the relay displacement test under waterless conditions. The signal feedback of the relay displacement signal meter 1-01 is used as the controlled quantity. The electronic control system 1-03 of the speed regulator switch adopts the relay displacement change rate control according to the input opening time To. Automatically calculate the main distribution displacement electrical quantity Mo corresponding to the opening time To. Set Mo to the electrical upper limit of the main distribution valve opening direction in the human-machine interaction interface 1-04 for automatic adjustment of the switch, and tighten the opening limit adjustment nut 4 to complete the opening calibration.

[0059] The whole process is calibrated by operating the human-machine interaction interface 1-04 in the automatic adjustment of the on-off machine. The complete on-off process curve is fitted, and the online error evaluation of the complete process of the speed regulator shutdown is given.

[0060] Although the present invention has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements may be made thereto based on the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection claimed by the present invention.

Claims

1. A turbine speed governor on / off automatic setting system, characterized in that: Including process equipment and automation systems; The process equipment and system include a support (1), a connecting mechanism (2), a main pressure regulating valve group (5), an emergency pressure regulating valve group (6) and a segmented closing valve group (7); the main pressure regulating valve group (5) is connected to the support (1), and the connecting mechanism (2) is connected to the valve core of the main pressure regulating valve group (5); The automation system includes a relay displacement signal meter (1-01), a main distribution displacement signal meter (1-02), a speed regulator on / off electronic control system (1-03) and an on / off automatic adjustment human-machine interaction interface (1-04); The displacement state of the valve core of the main pressure distribution valve group (5) is sent to the speed regulator switch machine electronic control system (1-03) through the connecting mechanism (2) by the main distribution displacement signal meter (1-02); the relay stroke is sent to the speed regulator switch machine electronic control system (1-03) through the relay displacement signal meter (1-01) installed on the relay cylinder telescopic arm; The speed regulator on / off motor electronic control system (1-03) is connected to the emergency pressure regulating valve group (6) via a signal cable, and the emergency pressure regulating valve group (6) is used to receive an action command issued by the speed regulator on / off motor electronic control system (1-03) and to feed back an action status to the speed regulator on / off motor electronic control system (1-03); The speed regulator on / off motor electronic control system (1-03) is connected to the segmented closing valve group (7) via a signal cable, and the segmented closing valve group (7) is used to receive an action command issued by the speed regulator on / off motor electronic control system (1-03) and to feed back an action status to the speed regulator on / off motor electronic control system (1-03); The on / off automatic adjustment human-machine interaction interface (1-04) is connected to the speed regulator on / off electronic control system (1-03) via a communication cable.

2. The turbine speed governor on / off automatic setting system according to claim 1, characterized in that: The process equipment and system also include a closing limit adjustment nut (3) and an opening limit adjustment nut (4), wherein the closing limit adjustment nut (3) and the opening limit adjustment nut (4) are rigidly connected to the connecting mechanism (2) and can move linearly in the same direction as the connecting mechanism (2).

3. The turbine speed governor on / off automatic setting system according to claim 1, characterized in that: The relay displacement change rate control is adopted, and the relay displacement signal meter (1-01) and the main distribution displacement signal meter (1-02) signals are used as feedback to automatically adjust the speed regulator on / off time.

4. The automatic setting system for turning on and off a turbine speed governor according to claim 1 is characterized in that: The system has a human-computer interaction screen for automatic adjustment of power on and off, an online monitoring and alarm screen, which can improve the intuitiveness of the power on and off time adjustment operation.

5. The automatic setting system for turning on and off a turbine speed governor according to claim 1 is characterized in that: The power on and off automatic adjustment human-machine interaction interface (1-04) has a zero position and full scale calibration interface, a middle position calibration interface, a power on and off parameter setting interface, and an online monitoring and alarm interface.

6. The turbine speed governor on / off automatic setting system according to claim 5, characterized in that: The zero position and full scale calibration interface can select the corresponding voltage or current type range to calibrate the engineering quantity correspondence between the electrical zero position and electrical full scale of the servomotor displacement signal meter (1-01) and the mechanical zero position and mechanical full scale of the servomotor.

7. The turbine speed governor on / off automatic setting system according to claim 5, characterized in that: The center position calibration interface can calibrate the engineering quantity correspondence between the electrical center position and the mechanical center position of the main displacement signal meter (1-02) after selecting the corresponding adapter / range type.

8. The turbine speed governor on / off automatic setting system according to claim 7, characterized in that: Adapter / range types include: ±20mA; ±12V; ±24V.

9. The turbine speed governor on / off automatic setting system according to claim 5, characterized in that: The power on / off parameter setting interface can set four parameters related to the adjustment guarantee calculation: Tg, Ts1, Ts2 and ag.

10. The turbine speed governor on / off automatic setting system according to claim 9, characterized in that: Tg and Ts1 are the first closing time; Ts2 is the second closing time; ag is the initial relative opening for closing; the initial relative opening ag indicates that the servomotor starts to close from the initial opening a0 position and reaches the inflection point position when the servomotor is closed.

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