CN114320492A - Method and device for power load unbalance protection of steam turbine set and electronic equipment - Google Patents
Method and device for power load unbalance protection of steam turbine set and electronic equipment Download PDFInfo
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- CN114320492A CN114320492A CN202210009535.XA CN202210009535A CN114320492A CN 114320492 A CN114320492 A CN 114320492A CN 202210009535 A CN202210009535 A CN 202210009535A CN 114320492 A CN114320492 A CN 114320492A
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Abstract
The application discloses a method and a device for protecting power load unbalance of a steam turbine set and electronic equipment, wherein the method comprises the following steps: acquiring the rotating speed of a steam turbine in a steam turbine set, the motive power of the steam turbine and the output power of a generator in the steam turbine set; and closing a high-pressure regulating valve and a medium-pressure regulating valve in the steam turbine set under the condition that the deviation between the motive power of the steam turbine and the output power of the generator exceeds a first threshold value and the rotating speed of the steam turbine exceeds a second threshold value.
Description
Technical Field
The application belongs to the field of thermal power plants, and particularly relates to a method and a device for protecting power load imbalance of a turboset and electronic equipment.
Background
When a power transmission line of a power grid fails, the output power of the generator is suddenly reduced, and the motive power of the turbine is basically unchanged, so that the motive power of the turbine is unbalanced with the output power of the generator, the power grid oscillates, and the load oscillation of a unit parallel to the power grid is caused. In order to maintain the stable operation of the power grid, the power load unbalance protection of the steam turbine needs to be set.
In some scenes, the power load unbalance protection of the steam turbine is triggered by the fact that the deviation between the motive power of the steam turbine and the output power of the generator exceeds a set value, the high-medium pressure regulating valve of the steam turbine is quickly closed to prevent the overspeed of the steam turbine, the power load unbalance protection of the steam turbine can generate misoperation under the condition of power grid fluctuation or other interference factors, the stability and the reliability of the operation of the steam turbine are low, and the power grid oscillation is easily caused to cause power failure accidents.
Disclosure of Invention
The embodiment of the application provides a method and a device for power load unbalance protection of a steam turbine set and electronic equipment, and can solve the problem that the stability and the reliability of operation of a steam turbine are low due to the fact that misoperation occurs in the power load unbalance protection of the steam turbine.
In a first aspect, an embodiment of the present application provides a method for power load imbalance protection of a steam turbine set, including:
acquiring the rotating speed of a steam turbine in a steam turbine set, the motive power of the steam turbine and the output power of a generator in the steam turbine set; and closing a high-pressure regulating valve and a medium-pressure regulating valve in the steam turbine set under the condition that the deviation between the motive power of the steam turbine and the output power of the generator exceeds a first threshold value and the rotating speed of the steam turbine exceeds a second threshold value.
In a second aspect, an embodiment of the present application provides a device for protecting a power load imbalance of a steam turbine set, including:
the acquiring module is used for acquiring the rotating speed of a steam turbine in the steam turbine set, the motive power of the steam turbine and the output power of a generator in the steam turbine set; and the closing module is used for closing a high-pressure regulating valve and a medium-pressure regulating valve in the steam turbine set under the condition that the deviation between the motive power of the steam turbine and the output power of the generator exceeds a first threshold value and the rotating speed of the steam turbine exceeds a second threshold value.
In a third aspect, an embodiment of the present application provides an electronic device, which includes a processor, a memory, and a program or an instruction stored on the memory and executable on the processor, and when the program or the instruction is executed by the processor, the method for protecting the power load imbalance of the steam turbine set according to the first aspect is implemented.
In a fourth aspect, embodiments of the present application provide a readable storage medium, on which a program or instructions are stored, which when executed by a processor implement the steps of the method for power load imbalance protection of a steam turbine group according to the first aspect.
In a fifth aspect, an embodiment of the present application provides a chip, where the chip includes a processor and a communication interface, where the communication interface is coupled to the processor, and the processor is configured to execute a program or an instruction to implement the method for power load imbalance protection of a steam turbine set according to the first aspect.
The technical scheme disclosed by the embodiment of the application comprises the following steps: acquiring the rotating speed of a steam turbine in a steam turbine set, the motive power of the steam turbine and the output power of a generator in the steam turbine set; and closing a high-pressure regulating valve and a medium-pressure regulating valve in the steam turbine set under the condition that the deviation between the motive power of the steam turbine and the output power of the generator exceeds a first threshold value and the rotating speed of the steam turbine exceeds a second threshold value. Therefore, by increasing the closing conditions of the high-pressure regulating valve and the medium-pressure regulating valve in the steam turbine set, the deviation between the motive power of the steam turbine and the output power of the generator exceeds a first threshold value, and the high-pressure regulating valve and the medium-pressure regulating valve in the steam turbine set are closed under the condition that the rotating speed of the steam turbine exceeds a second threshold value, so that the condition of misoperation of power load unbalance protection of the steam turbine is avoided, the stability and the reliability of the operation of the steam turbine are improved, and the oscillation of a power grid is avoided.
Drawings
FIG. 1 is a first schematic flow chart of a method for power load imbalance protection of a steam turbine plant according to an embodiment of the present disclosure;
FIG. 2 is a second schematic flow chart of a method for power load imbalance protection of a steam turbine plant according to an embodiment of the present disclosure;
FIG. 3 is a third schematic flow chart of a method for power load imbalance protection of a steam turbine plant according to an embodiment of the present disclosure;
FIG. 4 is a schematic structural diagram of a relay loop for power load imbalance protection of a steam turbine plant according to an embodiment of the present disclosure;
FIG. 5 is a schematic structural diagram of an apparatus for power load imbalance protection of a steam turbine plant according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. 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 application.
The method, the apparatus, the electronic device, and the storage medium for power load imbalance protection of a steam turbine set provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings by specific embodiments and application scenarios thereof.
Fig. 1 illustrates a method for power load imbalance protection of a steam turbine set according to an embodiment of the present invention, where an execution subject of the method may be a terminal device, that is, the method may be executed by hardware or software in the terminal device. The method comprises the following steps:
step S101: and acquiring the rotating speed of a steam turbine in the steam turbine set, the motive power of the steam turbine and the output power of a generator in the steam turbine set.
Specifically, the steam turbine set includes, but is not limited to, a steam turbine, a generator, a condenser, a condensate pump, a deaerator, a high-pressure heater, a high-pressure regulating valve, a medium-pressure regulating valve, a boiler set, and the like. The steam turbine may be selected as required by the load in the power system, the parameters of the steam turbine including main steam parameters and reheat steam parameters, and the reheat steam parameters may include high pressure cylinder exhaust parameters and medium pressure cylinder intake parameters of the steam turbine. The driving power of the steam turbine can be represented by the reheat steam pressure of the intermediate pressure cylinder of the steam turbine, and the driving power of the steam turbine is the driving power for driving the generator to generate electricity. The power generator in the steam turbine set is a power generator driven by a steam turbine, superheated steam generated by the boiler set enters the steam turbine to expand and do work, blades rotate to drive the power generator to generate power and generate output power, and the output power of the power generator in the steam turbine set can be represented by three-phase current of a Current Transformer (CT).
The rotating speed of the steam turbine in the steam turbine set can be the actual rotating speed of the steam turbine at the current time when the steam turbine operates, the rotating speed of the steam turbine can be subjected to two-out-of-three processing, false signals can be screened out after the rotating speed signals of the steam turbine are subjected to two-out-of-three processing, and the accuracy of the signals is high. In addition, the reheat steam pressure of the intermediate pressure cylinder of the steam turbine and the output current of the generator can also be subjected to two-out-of-three processing, so that false signals can be screened out, and the accuracy of the signals is high.
Step S103: in the event that the deviation between the motive power of the steam turbine and the output power of the generator exceeds a first threshold value and the rotational speed of the steam turbine exceeds a second threshold value, the high and medium pressure regulating valves in the steam turbine set are closed.
Specifically, the rotating speed in the steam turbine set can be the actual rotating speed after being processed by two out of three, specifically, the high-reliability overspeed protection monitor is composed of three rotating speed channels, the three channel monitors are used in the protection monitor to simultaneously monitor the rotating speed of the steam turbine, and if the rotating speed of any two channels in the three channels exceeds a second threshold value, a second trigger signal is sent out, so that the reliability is high.
Further, the deviation between the motive power of the steam turbine set and the output power of the generator may be determined by the deviation between the reheat steam pressure at the inlet of the first stage of the intermediate pressure cylinder of the steam turbine and the three-phase current of the generator, for example, when the deviation between the reheat steam pressure at the inlet of the first stage of the intermediate pressure cylinder of the steam turbine and the three-phase current of the generator exceeds a first threshold, and the rotation speed of the steam turbine exceeds a second threshold, the high-pressure regulating valve and the medium-pressure regulating valve in the steam turbine set are closed. Wherein, the first threshold value can be 40%, and the second threshold value can be 3018 rpm.
The method for protecting the power load imbalance of the steam turbine set provided by the embodiment of the application comprises the following steps: acquiring the rotating speed of a steam turbine in the steam turbine set, the motive power of the steam turbine and the output power of a generator in the steam turbine set; in the event that the deviation between the motive power of the steam turbine and the output power of the generator exceeds a first threshold value and the rotational speed of the steam turbine exceeds a second threshold value, the high and medium pressure regulating valves in the steam turbine set are closed. Therefore, by increasing the closing conditions of the high-pressure regulating valve and the medium-pressure regulating valve in the steam turbine set, the high-pressure regulating valve and the medium-pressure regulating valve in the steam turbine set are closed under the condition that the deviation between the motive power of the steam turbine and the output power of the generator exceeds a first threshold value and the rotating speed of the steam turbine exceeds a second threshold value, the condition that the power load imbalance protection of the steam turbine has misoperation is avoided, the stability and the reliability of the operation of the steam turbine are improved, and the oscillation of a power grid is avoided.
In one possible implementation, as shown in fig. 2, closing a high pressure regulating valve and a medium pressure regulating valve in a steam turbine set includes:
step S1031: a first trigger signal is sent indicating that the deviation exceeds a first threshold and a second trigger signal is sent indicating that the speed of the turbine exceeds a second threshold.
Specifically, a first trigger signal is output via a digital quantity after a deviation between a motive power of the turbine and an output power of the generator exceeds a first threshold value, and a second trigger signal is output via a digital quantity after a rotational speed of the turbine exceeds a second threshold value. The first trigger signal is used for triggering the first relay to act, and the second trigger signal is used for triggering the second relay to act.
Step S1033: and triggering the first relay to act according to the first trigger signal, and triggering the second relay to act according to the second trigger signal, and closing the high-pressure regulating valve and the medium-pressure regulating valve in the steam turbine set.
Specifically, under the condition that the first relay and the second relay both act, the high-pressure regulating valve and the medium-pressure regulating valve of the steam turbine can be closed quickly, the relay is triggered to act through the trigger signal to close the high-pressure regulating valve and the medium-pressure regulating valve in the steam turbine set, the instantaneity is high, the stability and the reliability of the operation of the steam turbine can be further improved, and the oscillation of a power grid is avoided.
In one possible implementation, closing a high pressure regulator valve and a medium pressure regulator valve in a steam turbine plant comprises: in the event that the rate of change of the current reduction of the generator exceeds a third threshold value, the high-pressure regulating valve and the medium-pressure regulating valve in the steam turbine set are closed.
Specifically, the rate of change of the current reduction of the generator is a rate of change of the current reduction of the generator in a predetermined time, wherein the third threshold may take a value of 40%. Under the condition that the deviation between the motive power of the steam turbine and the output power of the generator exceeds a first threshold value, the rotating speed of the steam turbine exceeds a second threshold value, and the change rate of the current reduction of the generator exceeds a third threshold value and is met simultaneously, a high-pressure regulating valve and a medium-pressure regulating valve in the steam turbine set are closed, the probability of misoperation of the power load unbalance protection of the steam turbine is further reduced, the stability and the reliability of the operation of the steam turbine are further improved, the probability of power grid oscillation is reduced, and the power failure accident is avoided.
Further, as shown in fig. 3, closing the high pressure regulating valve and the medium pressure regulating valve in the turbine group in the case where the rate of change in the current reduction of the generator exceeds the third threshold includes:
step S1041: a first trigger signal is sent indicating that the deviation exceeds a first threshold, a second trigger signal is sent indicating that the speed of the turbine exceeds a second threshold, and a third trigger signal is sent indicating that the rate of change exceeds a third threshold.
Specifically, after a deviation between motive power of the turbine and output power of the generator exceeds a first threshold value, a first trigger signal is output by a digital quantity, after a rotation speed of the turbine exceeds a second threshold value, a second trigger signal is output by the digital quantity, and after a change rate of a current decrease of the generator exceeds a third threshold value, a third trigger signal is output by the digital quantity. The first trigger signal is used for triggering the first relay to act, the second trigger signal is used for triggering the second relay to act, and the third trigger signal is used for triggering the third relay to act.
Step S1043: and triggering the first relay to act according to the first trigger signal, triggering the second relay to act according to the second trigger signal and triggering the third relay to act according to the third trigger signal, and closing the high-pressure regulating valve and the medium-pressure regulating valve in the steam turbine set.
Specifically, under the condition that the first relay, the second relay and the third relay are all operated, the high-pressure regulating valve and the medium-pressure regulating valve of the steam turbine can be closed quickly, the relays are triggered by trigger signals to close the high-pressure regulating valve and the medium-pressure regulating valve in the steam turbine set, the instantaneity is high, the stability and the reliability of the operation of the steam turbine can be further improved, and the oscillation of a power grid is avoided. In addition, under the condition that the deviation between the motive power of the steam turbine and the output power of the generator exceeds a first threshold value, the rotating speed of the steam turbine exceeds a second threshold value, and the change rate of the current reduction of the generator exceeds a third threshold value is met at the same time, a high-pressure regulating valve and a medium-pressure regulating valve in the steam turbine set are closed, the probability of misoperation of the power load unbalance protection of the steam turbine is further reduced, the stability and the reliability of the operation of the steam turbine are further improved, the probability of power grid oscillation is reduced, and the power failure accident is avoided.
For example, as shown in fig. 4, the first, second, and third trigger signals pass through C1, C2, and C3 to enter the first, second, and third relays JR8, JR9, and JR10, respectively. And only under the condition that the first trigger signal, the second trigger signal and the third trigger signal are simultaneously effective can the first relay JR8, the second relay JR9 and the third relay JR10 be triggered to act simultaneously, so that the high-pressure regulating valve and the medium-pressure regulating valve of the steam turbine are closed. The probability of misoperation of the power load unbalance protection of the steam turbine is further reduced, the stability and the reliability of the operation of the steam turbine are further improved, the probability of power grid oscillation is reduced, and power failure accidents are avoided.
In an embodiment, the function of the load power imbalance protection of the steam turbine provided by the embodiment of the present application may be tested and demonstrated, that is, the function of the load power imbalance protection of the steam turbine without the rotational speed limitation condition is tested, and the function of the load power imbalance protection of the steam turbine with the rotational speed limitation condition is tested.
Firstly, a load power unbalance protection function of a steam turbine without a rotation speed limiting condition is simulated for testing, if a generator is subjected to load shedding due to power grid equipment failure or power grid fluctuation, action data of a relay in an original power load unbalance loop before a two-out-of-three judgment is as follows 1:
TABLE 1 Primary Power unbalanced load Loop Relay before two out of three decision action data
Before the second judgment, whether the relay in the unbalanced power load loop acts or not can be observed through an indicator lamp of a clamping piece panel of the unbalanced power load loop, if the indicator lamp is on, the relay in the unbalanced power load loop acts, and if the indicator lamp is off, the relay in the unbalanced power load loop does not act.
The test results show that when the deviation value of the reheat steam pressure and the current of the generator is reduced to exceed 40%, the deviation condition of the action of the channels of the power load unbalance loop is met (the deviation values of the three channels are basically set to be consistent). And when the deviation condition of the motive power of the turbine and the output power of the generator in each channel of the power load unbalanced loop and the change rate condition of the current of the generator are simultaneously met, the relay in the corresponding channel of the power load unbalanced loop acts.
The action data of the relay in the original power load unbalanced loop after the judgment of two out of three is shown in the following table 2:
TABLE 2 action data of relay in original power load unbalance loop after two out of three judgment
And after the second judgment, whether the relay acts is obtained by measuring an output channel of the power load unbalanced loop relay.
The test results show that the condition of the change rate of the current reduction of the generator and the condition of the deviation between the motive power of the steam turbine and the output power of the generator are simultaneously met, the relay in any two power load unbalanced loop channels acts to trigger the output of the power load unbalanced loop protection, namely the high-pressure regulating valve and the medium-pressure regulating valve of the steam turbine are closed. When the condition of the rate of change of the reduction of the generator current and the condition of the deviation between the motive power of the steam turbine and the output power of the generator cannot be simultaneously met, the power load unbalance loop protection output cannot be triggered, namely the high-pressure regulating valve and the medium-pressure regulating valve of the steam turbine cannot be closed.
Therefore, the instantaneous fluctuation of the current signal of the generator is caused by the fluctuation of the power grid or the abnormality of the current detection equipment (such as the disconnection of a CT (current transformer)) and the condition of the change rate of the current reduction of the generator detected by the clamping piece of the power load unbalance loop and the deviation between the motive power of the steam turbine and the output power of the generator are simultaneously met, so that the protection misoperation of the power load unbalance loop is realized. After the power load unbalance loop protection is in misoperation, the high-pressure regulating valve and the medium-pressure regulating valve are closed and maintained for a preset time, the feed water flow rate is obviously reduced, and the steam turbine set is shut down in an unplanned mode with high probability.
When the load power of the steam turbine with the rotation speed limiting condition is unbalanced and protected, after the deviation between the motive power of the steam turbine and the output power of the generator exceeds a first threshold value, the rotation speed of the steam turbine exceeds a second threshold value and the change rate of the current reduction of the generator exceeds a third threshold value, the first relay, the second relay and the third relay all act, and therefore the high-pressure regulating valve and the medium-pressure regulating valve of the steam turbine can be closed quickly. The probability of misoperation of the power load unbalance protection of the steam turbine is further reduced, the stability and the reliability of the operation of the steam turbine are further improved, the probability of power grid oscillation is reduced, and power failure accidents are avoided.
It should be noted that, in the method for protecting power load imbalance of a steam turbine set provided in the embodiment of the present application, the execution main body may be a device for protecting power load imbalance of a steam turbine set, or a control module of the method for protecting power load imbalance of a steam turbine set in the device for protecting power load imbalance of a steam turbine set. The method for performing the power load imbalance protection of the steam turbine set by using the power load imbalance protection device of the steam turbine set in the embodiment of the present application is taken as an example, and the power load imbalance protection device of the steam turbine set provided in the embodiment of the present application is described.
Fig. 5 is a schematic structural diagram of an apparatus for power load imbalance protection of a steam turbine plant according to an embodiment of the present application. As shown in fig. 5, the apparatus 500 for power load imbalance protection of a steam turbine plant includes:
the acquiring module 501 is configured to acquire a rotation speed of a steam turbine in a steam turbine set, motive power of the steam turbine, and output power of a generator in the steam turbine set; a closing module 502 for closing a high pressure regulating valve and a medium pressure regulating valve in the steam turbine set if a deviation between the motive power of the steam turbine and the output power of the generator exceeds a first threshold and the rotational speed of the steam turbine exceeds a second threshold.
Through the technical scheme disclosed by the embodiment of the application, through increasing the closing condition of high pressure regulating valve and medium pressure regulating valve in the steam turbine set, deviation between the motive power of steam turbine and the output power of generator surpasss first threshold value, just under the condition that the rotational speed of steam turbine surpassed the second threshold value, just closed high pressure regulating valve and medium pressure regulating valve in the steam turbine set, avoided the condition that the malfunction appears in the unbalanced protection of steam turbine power load, improved the stability and the reliability of steam turbine operation, avoid arousing the electric wire netting oscillation.
In one possible implementation manner, the method further includes: and the opening module is used for opening a high-pressure regulating valve and a medium-pressure regulating valve of the steam turbine under the condition that the deviation between the motive power of the steam turbine and the output power of the generator does not exceed the first threshold value and the rotating speed of the steam turbine does not exceed the second threshold value.
In a possible implementation manner, the shutdown module 502 is further configured to send out a first trigger signal indicating that the deviation exceeds the first threshold, and a second trigger signal indicating that the rotation speed of the steam turbine exceeds the second threshold; and triggering a first relay to act according to the first trigger signal, and triggering a second relay to act according to the second trigger signal, and closing a high-pressure regulating valve and a medium-pressure regulating valve in the steam turbine set.
In one possible implementation, the closing module 502 is further configured to close the high pressure regulating valve and the medium pressure regulating valve in the steam turbine set if the rate of change of the current reduction of the generator exceeds a third threshold.
In a possible implementation manner, the shutdown module 502 is further configured to send out a first trigger signal indicating that the deviation exceeds the first threshold, a second trigger signal indicating that the rotation speed of the steam turbine exceeds the second threshold, and a third trigger signal indicating that the change rate exceeds the third threshold; and triggering a first relay to act according to the first trigger signal, triggering a second relay to act according to the second trigger signal and triggering a third relay to act according to the third trigger signal, and closing a high-pressure regulating valve and a medium-pressure regulating valve of the steam turbine.
The device 500 for power load imbalance protection of a steam turbine set in the embodiment of the present application may be a device, or may be a component, an integrated circuit, or a chip in a terminal. The device can be mobile electronic equipment or non-mobile electronic equipment. By way of example, the mobile electronic device may be a mobile phone, a tablet computer, a notebook computer, a palm top computer, a vehicle-mounted electronic device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook or a Personal Digital Assistant (PDA), and the like, and the non-mobile electronic device may be a server, a Network Attached Storage (NAS), a Personal Computer (PC), a Television (TV), a teller machine or a self-service machine, and the like, and the embodiments of the present application are not particularly limited.
The device 500 for power load imbalance protection of a steam turbine plant in the embodiment of the present application may be a device having an operating system. The operating system may be an Android (Android) operating system, an ios operating system, or other possible operating systems, and embodiments of the present application are not limited specifically.
The device 500 for power load imbalance protection of a steam turbine set provided in the embodiment of the present application can implement each process implemented in the above method embodiments, and is not described here again in order to avoid repetition.
Optionally, as shown in fig. 6, an electronic device 600 is further provided in this embodiment of the present application, and includes a processor 602, a memory 601, and a program or an instruction stored in the memory 601 and executable on the processor 602, where the program or the instruction is executed by the processor 602 to implement each process of the method embodiment for power load imbalance protection of a steam turbine group, and can achieve the same technical effect, and in order to avoid repetition, the details are not repeated here.
It should be noted that the electronic devices in the embodiments of the present application include the mobile electronic device and the non-mobile electronic device described above.
The present embodiment can implement each process of the method embodiment for power load imbalance protection of a steam turbine set, and can achieve the same technical effect, and for avoiding repetition, the details are not repeated here.
The embodiment of the present application further provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and when the program or the instruction is executed by a processor, the program or the instruction implements each process of the method embodiment for power load imbalance protection of a steam turbine set, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here.
The processor is the processor in the electronic device in the above embodiment. Readable storage media, including computer-readable storage media, such as Read-Only Memory (ROM), Random Access Memory (RAM), magnetic or optical disks, etc.
The embodiment of the present application further provides a chip, where the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to execute a program or an instruction to implement each process of the method embodiment for power load imbalance protection of a steam turbine set, and the same technical effect can be achieved, and in order to avoid repetition, the details are not repeated here.
It should be understood that the chips mentioned in the embodiments of the present application may also be referred to as system-on-chip, system-on-chip or system-on-chip, etc.
It should be noted that, in this document, 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 an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the methods of the embodiments of the present application.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A method of power load imbalance protection for a steam turbine plant, comprising:
acquiring the rotating speed of a steam turbine in a steam turbine set, the motive power of the steam turbine and the output power of a generator in the steam turbine set;
and closing a high-pressure regulating valve and a medium-pressure regulating valve in the steam turbine set under the condition that the deviation between the motive power of the steam turbine and the output power of the generator exceeds a first threshold value and the rotating speed of the steam turbine exceeds a second threshold value.
2. The method of power load imbalance protection for a steam turbine plant of claim 1, wherein after the closing of a high pressure regulating valve and a medium pressure regulating valve in the steam turbine plant, the method further comprises:
and under the condition that the deviation between the motive power of the steam turbine and the output power of the generator does not exceed the first threshold value and the rotating speed of the steam turbine does not exceed the second threshold value, opening a high-pressure regulating valve and a medium-pressure regulating valve in the steam turbine set.
3. The method of power load imbalance protection for a steam turbine plant of claim 1, wherein the closing a high pressure regulating valve and a medium pressure regulating valve in the steam turbine plant comprises:
sending a first trigger signal indicating that the deviation exceeds the first threshold and a second trigger signal indicating that the rotation speed of the steam turbine exceeds the second threshold;
and triggering a first relay to act according to the first trigger signal, and triggering a second relay to act according to the second trigger signal, and closing a high-pressure regulating valve and a medium-pressure regulating valve in the steam turbine set.
4. The method of power load imbalance protection for a steam turbine plant of claim 1, wherein the closing a high pressure regulating valve and a medium pressure regulating valve in the steam turbine plant comprises:
closing a high pressure regulating valve and the medium pressure regulating valve in the steam turbine set in a case where a rate of change of a current reduction of the generator exceeds a third threshold value.
5. The method of power load imbalance protection for a steam turbine plant of claim 4, wherein the closing of the high pressure regulating valve and the intermediate pressure regulating valve in the steam turbine plant comprises:
sending a first trigger signal indicating that the deviation exceeds the first threshold, a second trigger signal indicating that the rotational speed of the turbine exceeds the second threshold, and a third trigger signal indicating that the rate of change exceeds the third threshold;
and triggering a first relay to act according to the first trigger signal, triggering a second relay to act according to the second trigger signal and triggering a third relay to act according to the third trigger signal, and closing a high-pressure regulating valve and a medium-pressure regulating valve in the steam turbine set.
6. A power load imbalance protection apparatus for a steam turbine plant, comprising:
the acquiring module is used for acquiring the rotating speed of a steam turbine in the steam turbine set, the motive power of the steam turbine and the output power of a generator in the steam turbine set;
and the closing module is used for closing a high-pressure regulating valve and a medium-pressure regulating valve in the steam turbine set under the condition that the deviation between the motive power of the steam turbine and the output power of the generator exceeds a first threshold value and the rotating speed of the steam turbine exceeds a second threshold value.
7. The apparatus for power load imbalance protection of a steam turbine plant of claim 6, further comprising:
and the starting module is used for starting a high-pressure regulating valve and a medium-pressure regulating valve in the steam turbine set under the condition that the deviation between the motive power of the steam turbine and the output power of the generator does not exceed the first threshold value and the rotating speed of the steam turbine does not exceed the second threshold value.
8. The apparatus for power load imbalance protection of a steam turbine plant of claim 6, wherein the shutdown module is further configured to issue a first trigger signal indicating that the deviation exceeds the first threshold and a second trigger signal indicating that a speed of the steam turbine exceeds the second threshold; and triggering a first relay to act according to the first trigger signal, and triggering a second relay to act according to the second trigger signal, and closing a high-pressure regulating valve and a medium-pressure regulating valve in the steam turbine set.
9. An electronic device comprising a processor, a memory, and a program or instructions stored on the memory and executable on the processor, the program or instructions when executed by the processor implementing the steps of the method of power load imbalance protection for a steam turbine group as claimed in any one of claims 1 to 5.
10. A readable storage medium, on which a program or instructions are stored which, when executed by a processor, carry out the steps of the method of power load imbalance protection of a steam turbine group according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN106990358A (en) * | 2017-05-02 | 2017-07-28 | 国网重庆市电力公司 | A kind of rotating speed criterion computational methods of power load unbalance protection |
| CN107013261A (en) * | 2017-05-02 | 2017-08-04 | 国网重庆市电力公司 | A kind of power load unbalance protection criterion based on rotating speed and power signal |
| CN107404267A (en) * | 2017-07-19 | 2017-11-28 | 中国神华能源股份有限公司 | Generator losing load recognition methods and identifying system |
| CN110500143A (en) * | 2019-08-28 | 2019-11-26 | 杭州和利时自动化有限公司 | The control method and associated component of a kind of combustion gas and steam combined cycle power generating unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106990358A (en) * | 2017-05-02 | 2017-07-28 | 国网重庆市电力公司 | A kind of rotating speed criterion computational methods of power load unbalance protection |
| CN107013261A (en) * | 2017-05-02 | 2017-08-04 | 国网重庆市电力公司 | A kind of power load unbalance protection criterion based on rotating speed and power signal |
| CN107404267A (en) * | 2017-07-19 | 2017-11-28 | 中国神华能源股份有限公司 | Generator losing load recognition methods and identifying system |
| CN110500143A (en) * | 2019-08-28 | 2019-11-26 | 杭州和利时自动化有限公司 | The control method and associated component of a kind of combustion gas and steam combined cycle power generating unit |
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