CN112901288B - Switching method and control device for regulating valve of steam turbine - Google Patents
Switching method and control device for regulating valve of steam turbine Download PDFInfo
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- CN112901288B CN112901288B CN202110159482.5A CN202110159482A CN112901288B CN 112901288 B CN112901288 B CN 112901288B CN 202110159482 A CN202110159482 A CN 202110159482A CN 112901288 B CN112901288 B CN 112901288B
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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
- F01D17/105—Final actuators by passing part of the fluid
Abstract
The application discloses switching method and controlling means of steam turbine governing valve relates to steam turbine technical field to solve the technical problem that the generating set safety and stability operation is influenced by repeated valve flow characteristic test among the correlation technique, the switching method includes: respectively acquiring single valve command signals of each regulating valve of the same turbine and acquiring sequence valve command signals of each regulating valve of the same turbine; acquiring a switching selection signal aiming at a regulating valve of a steam turbine; determining the switching time length of each regulating valve according to a preset time parameter value, wherein the preset time parameter value is a value preset according to the operating condition of the steam turbine, and the switching time length of each regulating valve is different; and controlling each regulating valve of the steam turbine to switch between a single valve mode and a sequence valve mode according to the switching selection signal and the switching duration of each regulating valve, so that the switching completion time of each regulating valve is staggered. The application is used for switching the regulating valve.
Description
Technical Field
The application relates to the technical field of steam turbines, in particular to a switching method and a control device of a regulating valve of a steam turbine.
Background
The steam turbine is the most widely used prime mover in the thermal power plant, and the principle is that the steam inlet amount is controlled by adjusting the opening of the adjusting valves distributed on both sides of the steam turbine, and the steam throttled by the adjusting valves blows the blades on the rotor of the steam turbine to rotate the rotor, so as to drive the rotor of the generator to rotate to generate electric energy. Wherein, the larger the load carried by the generator is, the more the steam inlet quantity of the steam turbine is needed. The operation modes of the steam turbine regulating valve are divided into a single valve mode and a sequence valve mode. And in the actual operation process of the steam turbine, switching between a single valve mode and a sequence valve mode according to different working conditions.
The flow characteristic of the regulating valve is changed due to the abrasion of the regulating valve in the operation process of the steam turbine and the disassembly, installation and grinding of the regulating valve in the maintenance process, so that the problem of large load fluctuation occurs when the steam turbine which is operated for a period of time or is maintained switches the single valve/sequence valve. To avoid this problem, in the related art, it is generally necessary to perform a valve flow characteristic test again and determine a valve flow characteristic parameter again to maintain load stability during switching of the single valve/sequence valve.
However, in the related art, the valve flow characteristic test is repeatedly performed to repeatedly determine the valve flow characteristic, and the safe and stable operation of the generator set is influenced in the process of repeatedly performing the valve flow characteristic test.
Disclosure of Invention
The embodiment of the application aims to provide a switching method and a control device of a steam turbine regulating valve so as to solve the technical problem that safety and stability of a generator set are influenced by repeated valve flow characteristic tests in the related technology.
In order to solve the above technical problem, the embodiment of the present application is implemented as follows:
in a first aspect, an embodiment of the present application provides a method for switching a steam turbine regulating valve, which may include:
respectively acquiring single valve instruction signals of each regulating valve of the same turbine and sequence valve instruction signals of each regulating valve of the same turbine, wherein the single valve instruction signals are used for controlling the regulating valves to operate in a single valve mode, and the sequence valve instruction signals are used for controlling the regulating valves to operate in a sequence valve mode;
acquiring a switching selection signal aiming at a regulating valve of a steam turbine; the switching selection signal is used for selecting a single valve command signal or a sequence valve command signal;
determining the switching time length of each regulating valve according to a preset time parameter value, wherein the preset time parameter value is a value preset according to the operating condition of the steam turbine, the operating condition of the steam turbine is different, and the preset time parameter value is different; wherein the switching time duration of each regulating valve is different;
and controlling each regulating valve of the steam turbine to switch between a single valve mode and a sequence valve mode according to the switching selection signal and the switching duration of each regulating valve, so that the switching completion time of each regulating valve is staggered.
In a second aspect, an embodiment of the present application provides a control device, which may include:
the system comprises an acquisition module and a control module, wherein the acquisition module is used for respectively acquiring single valve instruction signals of each regulating valve of the same turbine and acquiring sequence valve instruction signals of each regulating valve of the same turbine, the single valve instruction signals are used for controlling the regulating valves to operate in a single valve mode, and the sequence valve instruction signals are used for controlling the regulating valves to operate in a sequence valve mode;
the acquisition module is also used for acquiring a switching selection signal aiming at the steam turbine regulating valve; the switching selection signal is used for selecting a single valve command signal or a sequence valve command signal;
the determining module is used for determining the switching time length of each regulating valve according to preset time parameter values, wherein the preset time parameter values are preset values according to the operating conditions of the steam turbine, the operating conditions of the steam turbine are different, and the preset time parameter values are different; wherein the switching time duration of each regulating valve is different;
and the switching module is used for controlling each regulating valve of the steam turbine to switch between a single valve mode and a sequence valve mode according to the switching selection signal and the switching duration of each regulating valve, so that the switching completion time of each regulating valve is staggered.
The embodiment of the application can achieve the following beneficial effects: according to the switching method of the steam turbine regulating valves, single valve command signals of the regulating valves aiming at the same steam turbine are respectively obtained, and sequence valve command signals of the regulating valves aiming at the same steam turbine are obtained; acquiring a switching selection signal aiming at a regulating valve of a steam turbine, wherein the switching selection signal is used for selecting a single valve command signal or a sequence valve command signal; determining the switching time length of each regulating valve according to a preset time parameter value, wherein the preset time parameter value is a value preset according to the operating condition of the steam turbine, and the switching time length of each regulating valve is different; and controlling each regulating valve of the steam turbine to switch between a single valve mode and a sequence valve mode according to the switching selection signal and the switching duration of each regulating valve, so that the switching completion time of each regulating valve is staggered. Therefore, in the switching process of the steam turbine regulating valve switching between the single valve and the sequence valve, different switching time lengths can be determined for the regulating valves of the same steam turbine, so that the switching action completion time of each regulating valve is staggered, the mutual influence of the switching actions of the regulating valves is avoided, the problem of large load fluctuation of the steam turbine regulating valve in the switching process of the single valve/the sequence valve can be solved without repeatedly performing a valve flow characteristic test, and the problem of influencing the safe and stable operation of a generator set due to the fact that the valve flow characteristic test needs to be repeatedly performed in the related technology is avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a schematic flow chart of a method for switching a turbine control valve according to an embodiment of the present disclosure;
FIG. 2 is a schematic flow chart of a method for switching a turbine regulator valve according to an embodiment of the present disclosure;
FIG. 3 is a schematic flow chart of a method for switching a turbine regulator valve according to an embodiment of the present disclosure;
fig. 4 is a schematic structural block diagram of a control device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
The features of the terms first and second in the description and in the claims of the present application may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality" is two or more unless otherwise specified. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
At present, because a regulating valve is abraded in the operation process of a steam turbine and the regulating valve is disassembled, installed and ground in the overhaul process of the steam turbine, the flow characteristic of the regulating valve is changed, and the problem of large load fluctuation occurs when the steam turbine which is operated for a period of time or is overhauled switches a single valve/sequence valve. To avoid this problem, in the related art, it is generally necessary to perform a valve flow characteristic test again and determine a valve flow characteristic parameter again to maintain load stability during switching of the single valve/sequence valve. However, repeated valve flow characteristic tests to repeatedly determine the valve flow characteristics waste manpower and material resources, are complex to operate, consume long time, and can also influence the safe and stable operation of the generator set in the repeated valve flow characteristic test process.
Based on the method, a time parameter is preset according to the operating condition of the steam turbine; and according to the preset time parameter, determining different switching time lengths for each regulating valve of the same turbine so as to stagger the completion time of the switching action of each regulating valve and avoid the mutual influence of the switching action of each regulating valve.
The switching method and the control device of the steam turbine regulating valve provided by the embodiment of the application are specifically described below with reference to fig. 1 to 4.
As shown in fig. 1, fig. 1 is a schematic flow chart of a switching method of a steam turbine regulating valve according to an embodiment of the present application, where the switching method may include:
step 110: the method includes the steps of obtaining single valve command signals for each regulating valve of the same turbine and obtaining sequence valve command signals for each regulating valve of the same turbine.
The single-valve instruction signal is used for controlling the regulating valve to operate in a single-valve mode, and the sequence valve instruction signal is used for controlling the regulating valve to operate in a sequence valve mode.
The number of the regulating valves of the same turbine is not limited in the embodiment of the present application, for example, for turbines of different models, the turbine may include 4 regulating valves, or 6 regulating valves, or 8 regulating valves, and so on. The number of regulating valves of the same turbine does not affect the implementation of the solution of the present application.
In step 110, in the single-valve mode, the opening degree of all the regulating valves is the same, and when the steam inlet amount needs to be increased, the opening degree of all the regulating valves is increased at the same time, and when the steam inlet amount needs to be decreased, the opening degree of all the regulating valves is decreased at the same time. In the sequential valve mode, the opening degrees of all the regulating valves are not completely the same, when the steam inlet amount needs to be increased, the regulating valves are opened one by one according to a preset opening sequence, and when the steam inlet amount needs to be reduced, the regulating valves are closed one by one according to a preset closing sequence. Accordingly, the valve opening values indicated by the single valve command signals of the regulating valves are the same, and the valve opening values indicated by the sequence valve command signals of the regulating valves are not completely the same, so that the difference exists. Furthermore, the regulating valves of the same turbine can be controlled to operate in a single-valve mode according to the same single-valve command signals, and the regulating valves of the same turbine can be controlled to operate in a sequential-valve mode according to different sequential-valve command signals.
In step 110, the obtaining manner of the single valve command signal and the sequence valve command signal of each regulating valve belongs to a relatively mature technology, and the specific obtaining manner in the embodiment of the present application is not limited. For example, automatic acquisition of single valve command signals and sequence valve command signals may generally be accomplished by a digital electro-hydraulic control system (DEH).
Step 120: acquiring a switching selection signal aiming at a regulating valve of a steam turbine; wherein the switching selection signal is used for selecting a single valve command signal or a sequence valve command signal.
In step 120, it can be appreciated that the switch select signal can be used to collectively control all of the regulating valves of the same turbine. Taking the example that the steam turbine comprises 6 regulating valves, if a single valve command signal is selected according to the switching selection signal, the 6 regulating valves of the steam turbine are all switched to a single valve mode to operate; if the sequence valve command signal is selected according to the switching selection signal, the 6 regulating valves of the steam turbine are switched to the sequence valve mode for operation.
In step 120, the acquisition manner of the switching selection signal belongs to the existing mature technology, and the specific acquisition manner in the embodiment of the present application is not limited. For example, automatic acquisition of the switching selection signal may be generally realized by a digital electro-hydraulic control system (DEH) or the like.
Step 130: and determining the switching time length of each regulating valve according to a preset time parameter value, wherein the preset time parameter value is a value preset according to the operating condition of the steam turbine, and the switching time length of each regulating valve is different.
The operation conditions of the steam turbine are different, and the preset time parameter values are different.
It should be noted that, in the related art, in the switching process in which the switching action is performed based on the switching selection signal, the time period for switching each regulating valve of the same steam turbine is the same. Wherein the switching action comprises: switching from the single valve mode to the sequence valve mode, or switching from the sequence valve mode to the single valve mode. For example, if the switching process between the single valve mode and the sequential valve mode takes 100 seconds, it takes 100 seconds for each regulator valve to switch from the single valve mode to the sequential valve mode, or from the sequential valve mode to the single valve mode. Because the admission of each governing valve of same steam turbine comes from same steam source, and is used for blowing the blade on the rotor of same platform steam turbine and makes the rotor rotate, in addition, the valve flow characteristic of each governing valve is inequality, and the valve flow characteristic of every governing valve still can change in the use, based on this, when each governing valve carries out the switching action simultaneously, receives the influence of mutual switching action easily, the undulant big problem of steam turbine load appears.
It can be understood that, in step 130, in the case that the time length for switching each regulating valve is different, the switching actions of each regulating valve are staggered, and the switching actions of each regulating valve can be prevented from influencing each other. Under the condition that the switching time duration of each regulating valve is different, the switching actions of each regulating valve have a certain sequence, and in the embodiment of the application, the preset time parameter value can be the difference of the switching time durations of two adjacent regulating valves of the switching actions. Thus, the switching actions of the regulating valves are executed in sequence according to the sequence of the switching actions, so that the switching actions of the regulating valves can be staggered.
In step 130, the turbine is operated differently and the values of the preset time parameters are different. That is to say, this application embodiment can be according to the operating condition preset time parameter of steam turbine under various operating modes. For example, the preset time parameter value is 30 seconds. The specific numerical value of the preset time parameter value is not limited in the embodiment of the application, and the preset time parameter value can be set to be 20 seconds, or 30 seconds, or 40 seconds, and the like according to the operation conditions of the steam turbine under different working conditions. The specific value of the preset time parameter value does not influence the implementation of the scheme of the application.
In step 130, different switching durations are determined for the individual control valves as a function of the predetermined time parameter value. The switching time duration of each regulating valve is guaranteed to be different, the specific implementation mode for determining the switching time duration of each regulating valve is not limited, and the sequence of the switching actions of each regulating valve is not limited specifically.
For example, taking the steam turbine including 6 regulating valves, presetting a time parameter for 30 seconds, and taking the serial number sequence of the 6 regulating valves as the sequence of the switching actions of the 6 regulating valves as an example, the embodiment of the present application may sequentially decrease the preset time parameter value according to the sequence of the switching actions of each regulating valve to determine the time length for switching of each regulating valve, or sequentially increase the preset time parameter value according to the sequence of the switching actions of each regulating valve to determine the time length for switching of each regulating valve.
Specifically, for convenience of understanding, the 6 regulating valves are respectively numbered as GV1, GV2, GV3, GV4, GV5, GV6, and the switching time durations of GV1, GV2, GV3, GV4, GV5, GV6 may be respectively set to 100 seconds, 130 seconds, 160 seconds, 190 seconds, 220 seconds, 250 seconds according to the preset time parameter. For another example, the time lengths for switching GV1, GV2, GV3, GV4, GV5 and GV6 are set to be 250 seconds, 220 seconds, 190 seconds, 160 seconds, 130 seconds and 100 seconds, respectively, according to the preset time parameter; and so on. Therefore, different switching time lengths can be set according to the preset time parameter values and the switching action sequence of each regulating valve, and the switching action completion time of each regulating valve is staggered.
Step 140: and controlling each regulating valve of the steam turbine to switch between a single valve mode and a sequence valve mode according to the switching selection signal and the switching duration of each regulating valve, so that the switching completion time of each regulating valve is staggered.
In step 140, the operation mode of each regulating valve of the steam turbine is switched, specifically between the single valve mode and the sequence valve mode, according to the switching selection signal and the time length used for switching each regulating valve. Under the condition that the switching time of each regulating valve is different, the switching action of each regulating valve is staggered, so that the mutual influence of the switching actions of each regulating valve can be avoided, and the problem of large load fluctuation in the switching process between the single valve mode and the sequence valve mode is avoided.
In step 140, the implementation of the switching action belongs to the existing mature technology, and the embodiment of the present application does not limit the specific manner. For example, in response to a click operation of an operator clicking a "switch" button in a computer operation screen, an automatic control logic output signal of a digital electro-hydraulic control system (DEH) drives the regulating valve to complete a switching action.
According to the switching method of the steam turbine regulating valves, single valve command signals of the regulating valves aiming at the same steam turbine are respectively obtained, and sequence valve command signals of the regulating valves aiming at the same steam turbine are obtained; acquiring a switching selection signal aiming at a regulating valve of a steam turbine; determining the switching time length of each regulating valve according to the preset time parameter value, wherein the switching time lengths of the regulating valves are different; and controlling each regulating valve of the steam turbine to switch between a single valve mode and a sequence valve mode according to the switching selection signal and the switching duration of each regulating valve, so that the switching completion time of each regulating valve is staggered. Therefore, different switching time lengths are determined for the regulating valves of the same turbine, so that the switching actions of the regulating valves are staggered, the switching actions of the regulating valves are prevented from being influenced, the problem that the load fluctuation of the turbine regulating valve is large in the switching process of a single valve/sequence valve can be solved without repeatedly carrying out a valve flow characteristic test, and the problem that the safe and stable operation of a generator set is influenced due to the fact that the valve flow characteristic test is repeatedly carried out in the related technology is avoided.
Alternatively, in the embodiment of the present application, it is considered that the switching action is divided into two types: switching from the single-valve mode to the sequence-valve mode, or switching from the sequence-valve mode to the single-valve mode. Correspondingly, the switching selection signal comprises a first switching selection signal, and the first switching selection signal is used for selecting the single valve command signal; the shift select signal further includes a second shift select signal for selecting the sequence valve command signal.
Accordingly, as shown in fig. 2, the step 140 may include: step 1401: and controlling the operation mode of the steam turbine regulating valve to be switched from a sequence valve mode to a single valve mode according to the first switching selection signal and the switching duration of each regulating valve, so that the switching completion time of each regulating valve to be switched to the single valve mode is staggered. Therefore, under the condition that the switching action is switched from the sequence valve mode to the single valve mode, considering that the time length for switching each regulating valve of the same steam turbine is different, the switching action of each regulating valve is staggered constantly, the mutual influence of the switching actions of each regulating valve is avoided, the problem of large load fluctuation of the steam turbine regulating valve in the single valve/sequence valve switching process can be solved without repeatedly carrying out a valve flow characteristic test, and the problem of influencing the safe and stable operation of a generator set due to the fact that the valve flow characteristic test is repeatedly carried out is further avoided.
As shown in fig. 3, the step 140 may further include: step 1402: and controlling the operation mode of the steam turbine regulating valve to be switched from a single valve mode to a sequence valve mode according to the second switching selection signal and the switching duration of each regulating valve, so that the switching completion time of each regulating valve to be switched to the sequence valve mode is staggered. Therefore, under the condition that the switching action is switched from the single valve mode to the sequence valve mode, considering that the time length for switching each regulating valve of the same steam turbine is different, the switching action of each regulating valve is staggered constantly, the mutual influence of the switching actions of each regulating valve is avoided, the problem of large load fluctuation of the steam turbine regulating valve in the single valve/sequence valve switching process can be solved without repeatedly performing a valve flow characteristic test, and the problem of influencing the safe and stable operation of a generator set due to the repeatedly performing the valve flow characteristic test is further avoided.
In addition, considering that the operation modes of the regulating valves after being switched can be different (single valve mode or sequential valve mode), the switching sequence of each regulating valve can be determined in different modes according to the embodiment of the application, so that the switching action of the regulating valves is more suitable for the operation modes of the regulating valves after being switched on the premise of ensuring different switching time durations of the regulating valves.
Specifically, in a specific embodiment, as shown in fig. 2, in the case that the switching action is switched from the sequence valve mode to the single valve mode, the step 130 may include:
step 1301: taking the preset time parameter value as the difference of the switching time lengths of two adjacent regulating valves in the switching action;
step 1302: the sequence of the numbers of the regulating valves is used as the sequence of the switching action of the regulating valves;
step 1303: sequentially reducing the preset time parameter values according to the sequence of the switching action of each regulating valve to determine the switching time length of each regulating valve; and the time length used for switching of the regulating valve with the minimum time length used for switching among the regulating valves is a fixed value.
It can be understood that the operation mode after the switching of the regulating valve is a single-valve mode: the opening degrees of all the regulating valves are the same, when the steam inlet amount needs to be increased, the opening degrees of all the regulating valves are increased at the same time, and when the steam inlet amount needs to be reduced, the opening degrees of all the regulating valves are reduced at the same time. The switching action sequence of each regulating valve can be randomly arranged, the preset time parameter values are sequentially reduced or sequentially increased according to the switching action sequence of each regulating valve so as to determine the switching duration of each regulating valve, and the switching duration of each regulating valve can be different.
For example, the embodiment of the present application may provide a specific manner to determine the time length for switching, take the sequence of numbers of each regulating valve as the sequence of switching actions of each regulating valve, sequentially reduce the preset time parameter value to determine the time length for switching of each regulating valve, and specifically take the preset time parameter value as the difference between the time lengths for switching of two adjacent regulating valves with numbers to obtain different time lengths for switching of each regulating valve; wherein the switching time period of the regulating valve with the smallest switching time period among the regulating valves is a fixed value, for example, 100 seconds.
For convenience of understanding, taking the example that the steam turbine includes 6 regulating valves and the preset time parameter is 30 seconds, the 6 regulating valves are numbered as GV1, GV2, GV3, GV4, GV5, GV6 respectively, and the switching time periods of the GV6, GV5, GV4, GV3, GV2, GV1 can be set to 250 seconds, 220 seconds, 190 seconds, 160 seconds, 130 seconds, 100 seconds respectively. Therefore, the time length used for switching each regulating valve can be ensured to be different, and the method can be suitable for the single valve mode after the regulating valves are switched after the switching action is executed during the time length used for switching.
In another specific embodiment, as shown in fig. 3, in the case that the switching operation is switched from the single-valve mode to the sequential-valve mode, the step 130 may include:
step 1301: taking a preset time parameter value as the difference of the switching time lengths of two adjacent regulating valves in the switching action;
step 1304: taking the opening sequence of each regulating valve in the sequence valve mode as the sequence of the switching action of each regulating valve;
step 1303: sequentially reducing the preset time parameter values according to the sequence of the switching action of each regulating valve to determine the switching time length of each regulating valve; wherein the switching time length of the regulating valve with the minimum switching time length in each regulating valve is a fixed value.
It can be understood that the operation mode after the switching of the regulating valve is a sequence valve mode: the opening degrees of the regulating valves are not completely the same, when the steam inlet amount needs to be increased, the regulating valves are opened one by one according to a preset sequence, and when the steam inlet amount needs to be reduced, the regulating valves are closed one by one according to the preset sequence. According to the switching action sequence of each regulating valve, the opening sequence of each regulating valve in the sequence valve mode can be used as the switching action sequence of each regulating valve, and the preset time parameter value is sequentially reduced according to the switching action sequence of each regulating valve so as to determine the switching time length of each regulating valve. Therefore, the time length for switching each regulating valve is different, and the method can be suitable for the sequential valve mode after the regulating valves are switched after the switching action is executed in the time length period for switching.
The time period for switching the control valve with the minimum time period for switching among the control valves is a fixed value, for example, 100 seconds. For convenience of understanding, for example, taking the example that the steam turbine includes 6 regulating valves and the preset time parameter is 30 seconds, the 6 regulating valves are respectively numbered as GV1, GV2, GV3, GV4, GV5 and GV6, and if the opening sequence of the 6 regulating valves preset in the sequence valve mode is GV3, GV6-GV4-GV5-GV1-GV2, the switching time lengths of GV3, GV6, GV4, GV5, GV1 and GV2 can be set as 220 seconds, 190 seconds, 160 seconds, 130 seconds and 100 seconds respectively. Therefore, the time length used for switching each regulating valve can be ensured to be different, and the method can be suitable for the sequential valve mode after the regulating valves are switched after the switching action is executed during the time length used for switching.
On the other hand, based on the same concept as the switching method of the steam turbine regulating valve provided in any of the embodiments of the present application, a control device provided in an embodiment of the present application is used for implementing each process of the switching method of the steam turbine regulating valve, as shown in fig. 4, the control device may include:
the system comprises an acquisition module and a control module, wherein the acquisition module is used for respectively acquiring single valve instruction signals of each regulating valve of the same turbine and acquiring sequence valve instruction signals of each regulating valve of the same turbine, the single valve instruction signals are used for controlling the regulating valves to operate in a single valve mode, and the sequence valve instruction signals are used for controlling the regulating valves to operate in a sequence valve mode;
the acquisition module is also used for acquiring a switching selection signal aiming at the steam turbine regulating valve; the switching selection signal is used for selecting a single valve command signal or a sequence valve command signal;
the determining module is used for determining the switching time length of each regulating valve according to preset time parameter values, wherein the preset time parameter values are preset values according to the operating conditions of the steam turbine, the operating conditions of the steam turbine are different, and the preset time parameter values are different; wherein the switching time duration of each regulating valve is different;
and the switching module is used for controlling each regulating valve of the steam turbine to switch between a single valve mode and a sequence valve mode according to the switching selection signal and the switching duration of each regulating valve, so that the switching completion time of each regulating valve is staggered.
The switching module is used for controlling the operation mode of the steam turbine regulating valve to be switched from the sequence valve mode to the single valve mode according to the first switching selection signal and the switching duration of each regulating valve, so that the switching completion time for each regulating valve to be switched to the single valve mode is staggered.
Further, the determining module is used for taking the preset time parameter value as the difference of the switching time lengths of two adjacent regulating valves in the switching action; taking the sequence of the serial numbers of the regulating valves as the sequence of the switching actions of the regulating valves, and sequentially reducing the preset time parameter value according to the sequence of the switching actions of the regulating valves to determine the switching time length of the regulating valves; wherein the switching time length of the regulating valve with the minimum switching time length in each regulating valve is a fixed value.
The switching module is used for controlling the operation mode of the steam turbine regulating valve to be switched from the single valve mode to the sequence valve mode according to the second switching selection signal and the switching duration of each regulating valve, so that the switching completion time of each regulating valve to the sequence valve mode is staggered.
Further, the determining module is used for taking the preset time parameter value as the difference of the switching time lengths of two adjacent regulating valves in the switching action; taking the opening sequence of each regulating valve in a sequence valve mode as the sequence of the switching action of each regulating valve, and sequentially reducing the preset time parameter value according to the sequence of the switching action of each regulating valve to determine the switching time length of each regulating valve; wherein the switching time length of the regulating valve with the minimum switching time length in each regulating valve is a fixed value.
In the embodiment of the application, the control device acquires the single valve command signals of the regulating valves aiming at the same turbine and acquires the sequence valve command signals of the regulating valves aiming at the same turbine respectively; acquiring a switching selection signal aiming at a regulating valve of a steam turbine; determining the switching time length of each regulating valve according to the preset time parameter value, wherein the switching time lengths of the regulating valves are different; and controlling each regulating valve of the steam turbine to switch between a single valve mode and a sequence valve mode according to the switching selection signal and the switching duration of each regulating valve, so that the switching completion time of each regulating valve is staggered. Therefore, different switching time lengths are determined for the regulating valves of the same turbine, so that the switching actions of the regulating valves are staggered, the switching actions of the regulating valves are prevented from being influenced with each other in the switching process, the problem of large load fluctuation of the turbine regulating valve in the switching process of the single valve/sequence valve can be solved without repeatedly carrying out a valve flow characteristic test, and the problem of influencing the safe and stable operation of a generator set due to the fact that the valve flow characteristic test needs to be repeatedly carried out in the related technology is solved.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement or the like made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.
Claims (6)
1. A method of switching a turbine regulator valve, comprising:
respectively acquiring single valve instruction signals of each regulating valve of the same turbine and sequence valve instruction signals of each regulating valve of the same turbine, wherein the single valve instruction signals are used for controlling the regulating valves to operate in a single valve mode, and the sequence valve instruction signals are used for controlling the regulating valves to operate in a sequence valve mode;
acquiring a switching selection signal aiming at a regulating valve of a steam turbine; the switching selection signal is used for selecting a single valve command signal or a sequence valve command signal;
determining the switching time length of each regulating valve according to a preset time parameter value, wherein the preset time parameter value is a value preset according to the operating condition of the steam turbine, the operating condition of the steam turbine is different, and the preset time parameter value is different; wherein the switching time lengths of the regulating valves are different;
controlling each regulating valve of the steam turbine to switch between a single valve mode and a sequence valve mode according to the switching selection signal and the switching duration of each regulating valve, so that the switching completion time of each regulating valve is staggered;
the switch select signal includes a first switch select signal for selecting a single valve command signal,
controlling each regulating valve of the steam turbine to switch between a single valve mode and a sequence valve mode according to the switching selection signal and the switching duration of each regulating valve, comprising: controlling the operation mode of the steam turbine regulating valve to be switched from a sequence valve mode to a single valve mode according to the first switching selection signal and the switching duration of each regulating valve, so that the switching completion time of each regulating valve to be switched to the single valve mode is staggered;
the time length for determining the switching of the regulating valve according to the preset time parameter value comprises the following steps:
taking the preset time parameter value as the difference of the switching time lengths of two adjacent regulating valves in the switching action;
the sequence of the numbers of the regulating valves is used as the sequence of the switching action of the regulating valves;
sequentially reducing the preset time parameter value according to the sequence of the switching action of each regulating valve to determine the time length used for switching each regulating valve; and the time length used for switching of the regulating valve with the minimum time length used for switching among the regulating valves is a fixed value.
2. The switching method according to claim 1, wherein the switch selection signal includes a second switch selection signal for selecting a sequence valve command signal,
controlling each regulating valve of the steam turbine to switch between a single valve mode and a sequence valve mode according to the switching selection signal and the switching duration of each regulating valve, comprising: and controlling the operation mode of the steam turbine regulating valve to be switched from a single valve mode to a sequence valve mode according to the second switching selection signal and the switching duration of each regulating valve, so that the switching completion time of each regulating valve to be switched to the sequence valve mode is staggered.
3. The switching method according to claim 2, wherein said determining the time period for switching the regulating valve according to the preset time parameter value comprises:
taking the preset time parameter value as the difference of the switching time lengths of two adjacent regulating valves in the switching action; taking the opening sequence of each regulating valve in a sequence valve mode as the sequence of the switching action of each regulating valve, and sequentially reducing the preset time parameter value according to the sequence of the switching action of each regulating valve to determine the switching time length of each regulating valve; and the time length used for switching of the regulating valve with the minimum time length used for switching among the regulating valves is a fixed value.
4. A control apparatus for a turbine governor valve, comprising:
the system comprises an acquisition module and a control module, wherein the acquisition module is used for respectively acquiring single valve instruction signals of each regulating valve of the same steam turbine and acquiring sequence valve instruction signals of each regulating valve of the same steam turbine, the single valve instruction signals are used for controlling the regulating valves to operate in a single valve mode, and the sequence valve instruction signals are used for controlling the regulating valves to operate in a sequence valve mode;
the acquisition module is also used for acquiring a switching selection signal aiming at a steam turbine regulating valve; wherein the switching selection signal is used for selecting a single valve command signal or a sequence valve command signal;
the determining module is used for determining the switching time length of each regulating valve according to preset time parameter values, wherein the preset time parameter values are preset values according to the operating conditions of the steam turbine, the operating conditions of the steam turbine are different, and the preset time parameter values are different; wherein the switching time lengths of the regulating valves are different;
the switching module is used for controlling each regulating valve of the steam turbine to switch between a single valve mode and a sequence valve mode according to the switching selection signal and the switching duration of each regulating valve, so that the switching completion time of each regulating valve is staggered;
the switching selection signal comprises a first switching selection signal, the first switching selection signal is used for selecting a single-valve instruction signal, and the switching module is used for controlling the operation mode of the steam turbine regulating valve to be switched from a sequence valve mode to a single-valve mode according to the first switching selection signal and the switching duration of each regulating valve, so that the switching completion time for each regulating valve to be switched to the single-valve mode is staggered;
the determining module is used for taking the preset time parameter value as the difference of the switching time lengths of two adjacent regulating valves in the switching action; taking the sequence of the serial numbers of the regulating valves as the sequence of the switching actions of the regulating valves, and sequentially reducing the preset time parameter value according to the sequence of the switching actions of the regulating valves to determine the switching time length of the regulating valves; and the time length used for switching of the regulating valve with the minimum time length used for switching among the regulating valves is a fixed value.
5. The control apparatus of claim 4, wherein the switch selection signal comprises a second switch selection signal for selecting the sequence valve command signal, and the switching module is configured to control the operation mode of the steam turbine regulating valve to be switched from the single-valve mode to the sequence valve mode according to the second switch selection signal and a time period used for switching each regulating valve, such that switching completion times for switching each regulating valve to the sequence valve mode are staggered.
6. The control device according to claim 5, characterized in that the determination module is configured to use the preset time parameter value as a difference between switching time lengths of two adjacent regulating valves in the switching action; taking the opening sequence of each regulating valve in a sequence valve mode as the sequence of the switching action of each regulating valve, and sequentially reducing the preset time parameter value according to the sequence of the switching action of each regulating valve to determine the switching time length of each regulating valve; and the time length used for switching of the regulating valve with the minimum time length used for switching among the regulating valves is a fixed value.
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