CN116436095A - Auxiliary machine fault load reduction control method, device, equipment and storage medium - Google Patents

Auxiliary machine fault load reduction control method, device, equipment and storage medium Download PDF

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CN116436095A
CN116436095A CN202310321153.5A CN202310321153A CN116436095A CN 116436095 A CN116436095 A CN 116436095A CN 202310321153 A CN202310321153 A CN 202310321153A CN 116436095 A CN116436095 A CN 116436095A
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steam extraction
heat supply
unit
steam
supply unit
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杜之正
宋瑞福
张岩
周广飞
陶蕊
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Huadian Electric Power Research Institute Co Ltd
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Huadian Electric Power Research Institute Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00—General layout or general methods of operation of complete plants
    • F01K13/003—Arrangements for measuring or testing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00—General layout or general methods of operation of complete plants
    • F01K13/02—Controlling, e.g. stopping or starting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K21/00—Steam engine plants not otherwise provided for
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
    • H02J3/144—Demand-response operation of the power transmission or distribution network
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Turbines (AREA)

Abstract

The invention discloses a control method, a device, equipment and a storage medium for auxiliary machine fault load reduction, wherein the method comprises the following steps: under the condition that auxiliary machine faults and load reduction work conditions occur in the steam extraction heat supply unit, a unit electric load steam extraction electric load of the steam extraction heat supply unit is obtained; generating target sliding pressure data of the steam extraction heat supply unit based on target electric load data obtained by adding the unit electric load and the steam extraction electric load; calculating the sliding pressure difference between the target sliding pressure data and preset sliding pressure data; adding the target sliding pressure data and the sliding pressure difference to obtain differential pressure compensation data; and under the condition that the sliding pressure difference is smaller than or equal to a first preset threshold value and the differential pressure compensation data is larger than or equal to a second preset threshold value, switching the steam extraction heat supply unit from sliding pressure operation to constant pressure operation. According to the technical scheme provided by the invention, the running stability of the steam extraction heat supply unit equipment can be improved to a certain extent under the condition of auxiliary machine faults.

Description

Auxiliary machine fault load reduction control method, device, equipment and storage medium
Technical Field
The invention relates to the technical field of thermal power generation, in particular to a control method, a device, equipment and a storage medium for auxiliary machine fault load reduction.
Background
Along with the continuous development of industrial technology, at present, the proportion of external steam extraction and external heat supply of some power generation enterprises to the heat load of the steam extraction and heat supply unit is increased, and an auxiliary machine fault load Reduction (RB) control strategy designed during the debugging of the steam extraction and heat supply unit is difficult to meet the working condition requirements of the external steam extraction and external heat supply unit. The logic of auxiliary machine fault load reduction can quickly reduce the load of the machine set to the corresponding output which can be actually achieved by the current auxiliary machine when the main auxiliary machine fault of the machine set trips, and adjust the parameters of the machine set to be within the allowable range so as to ensure the continuous operation of the machine set and avoid non-stop accidents. In the prior art, the control logic of the auxiliary machine fault load reduction is not modified and optimized correspondingly, so that the electric load of the unit cannot practically reflect the actual output condition of the unit under the working condition of the auxiliary machine fault load reduction, and larger disturbance is generated in the switching process of the sliding pressure operation and the constant pressure operation of the unit, the auxiliary machine fault load reduction is possibly caused to fail, and the risk of shutdown of the steam extraction and heat supply unit exists.
Disclosure of Invention
In view of the above, the embodiment of the invention provides a control method, a device, equipment and a storage medium for reducing load of an auxiliary machine fault, which can improve the running stability of the steam extraction heat supply unit equipment to a certain extent under the condition of the auxiliary machine fault.
The invention provides a control method for auxiliary machine fault load reduction, which comprises the following steps: under the condition that the working condition that auxiliary machine faults occur to the steam extraction heat supply unit and load is reduced is detected, acquiring the unit electric load of the steam extraction heat supply unit and the steam extraction electric load representing the steam extraction flow of the steam extraction heat supply unit; generating target sliding pressure data of the steam extraction heat supply unit based on target electric load data obtained by adding the unit electric load and the steam extraction electric load; calculating a sliding pressure data difference between the target sliding pressure data and preset sliding pressure data; adding the target sliding pressure data and the sliding pressure data difference to obtain differential pressure compensation data; and under the condition that the sliding pressure data difference is smaller than or equal to a first preset threshold value and the differential pressure compensation data is larger than or equal to a second preset threshold value, switching the steam extraction heat supply unit from sliding pressure operation to constant pressure operation.
In one embodiment, the control method for auxiliary machine fault load reduction further includes: under the condition that the auxiliary machine of the steam extraction heat supply unit is monitored to be faulty, acquiring the main steam flow of the steam extraction heat supply unit; converting the main steam flow into a steam electrical load indicative of unit output; and sending a request signal for reducing the load of the auxiliary machine fault under the condition that the steam electric load is larger than or equal to a preset electric load.
In one embodiment, converting the main steam flow into a steam electrical load that characterizes unit output includes: performing lead-lag filtering processing on the main steam flow to obtain a target main steam flow; and converting the target main steam flow into a steam electric load representing the output of the unit.
In one embodiment, the control method for auxiliary machine fault load reduction further includes: and under the condition that the steam electric load is smaller than the preset electric load or the time of occurrence of the working condition of the auxiliary machine fault load reduction is longer than the preset time, starting the auxiliary machine fault load reduction reset.
In one embodiment, the control method for auxiliary machine fault load reduction further includes: and controlling a steam turbine regulating door of the steam extraction heat supply unit to be in a locking state until a request signal of auxiliary machine fault load reduction disappears or the auxiliary machine fault load reduction is reset.
In one embodiment, the control method for auxiliary machine fault load reduction further includes: and controlling the steam extraction check valve and the steam extraction quick closing valve of the steam extraction heat supply unit to be closed, and controlling the electric regulating valve and the electric closing valve of the steam extraction heat supply unit to be opened.
In one embodiment, the method for controlling the closing of the steam extraction check valve and the steam extraction quick closing valve of the steam extraction heat supply unit comprises the following steps: when the time of the working condition of the auxiliary machine fault load reduction reaches a first preset time, the steam extraction check valve is controlled to be closed; and under the condition that the time of the working condition of the auxiliary machine fault load reduction reaches the second preset time, the steam extraction quick closing valve is controlled to be closed.
In one embodiment, generating the target slip pressure data of the steam extraction heat supply unit based on target electrical load data obtained by adding the unit electrical load and the steam extraction electrical load includes: adding the unit electric load and the steam extraction electric load to obtain target electric load data; establishing a conversion relation model for converting the thermal load of the steam extraction heat supply unit into an electric load; and inputting the target electric load data into the conversion relation model to obtain target sliding pressure data of the steam extraction heat supply unit.
Another aspect of the present invention provides an auxiliary machine fault load reduction control device, including: the data acquisition unit is used for acquiring the unit electric load of the steam extraction heat supply unit and the steam extraction electric load representing the steam extraction flow of the steam extraction heat supply unit under the condition that the auxiliary machine fault load reduction occurs in the steam extraction heat supply unit is detected; the sliding pressure data generating unit is used for generating target sliding pressure data of the steam extraction heat supply unit based on target electric load data obtained by adding the unit electric load and the steam extraction electric load; a differential pressure calculation unit for calculating a slip pressure data difference between the target slip pressure data and preset slip pressure data; the differential pressure compensation unit is used for adding the target sliding pressure data and the sliding pressure data difference to obtain differential pressure compensation data; and the operation mode switching unit is used for switching the steam extraction heat supply unit from the sliding pressure operation to the constant pressure operation under the condition that the sliding pressure data difference is smaller than or equal to a first preset threshold value and the differential pressure compensation data is larger than or equal to a second preset threshold value.
The method comprises the steps of obtaining a unit electric load and a unit steam extraction flow of a steam extraction heat supply unit, converting the unit steam extraction flow into the steam extraction electric load, then under the condition that the RB working condition occurs in the steam extraction heat supply unit, generating corresponding target sliding pressure data based on the unit electric load and the steam extraction electric load, calculating the sliding pressure data difference between the target sliding pressure data and preset sliding pressure data, designing 2 AXSEL selection function logics, wherein one AXSEL selection function logic is used for comparing the sliding pressure data difference with a first preset threshold value, the other AXSEL selection function logic is used for comparing the target sliding pressure data after differential pressure compensation with a second preset threshold value, and switching the steam extraction heat supply unit from a sliding pressure operation mode to a constant pressure operation mode under the condition that the sliding pressure data difference is smaller than or equal to the second preset threshold value, so that the sliding pressure undisturbed switching logic can be avoided when the RB working condition occurs, larger disturbance to a system is caused, and the stability of a heat supply unit can be improved under the condition that an auxiliary pump fault occurs to a certain extent.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and should not be construed as limiting the invention in any way, in which:
FIG. 1 shows a schematic diagram of steps of a method for controlling auxiliary machine fault load shedding in one embodiment of the present disclosure;
FIG. 2 illustrates a logic diagram of undisturbed switching of a main steam pressure set point during RB operation of a steam extraction and heat supply unit in one embodiment of the disclosure;
FIG. 3 is a logic diagram illustrating the operation of the induced draft fan RB of the steam extraction and heat supply unit in one embodiment of the present disclosure;
FIG. 4 illustrates a heat supply network cut-off logic diagram for RB operation in one embodiment of the present disclosure;
FIG. 5 shows a schematic diagram of an auxiliary machine fault load reduction control device in one embodiment of the present disclosure;
fig. 6 shows a schematic structural diagram of an electronic device in one embodiment of the present disclosure.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present disclosure, but not all embodiments. All other embodiments, which can be made by those skilled in the art without the inventive effort, based on the embodiments in this disclosure are intended to be within the scope of this disclosure.
Along with the continuous development of industrial technology, at present, the proportion of external steam extraction and external heat supply of some power generation enterprises to the heat load of the steam extraction and heat supply unit is increased, and an auxiliary machine fault load Reduction (RB) control strategy designed during the debugging of the steam extraction and heat supply unit is difficult to meet the working condition requirements of the external steam extraction and external heat supply unit. When the main auxiliary machine of the unit is tripped due to faults, the RB logic can quickly reduce the load of the unit to the corresponding output which can be actually achieved by the current auxiliary machine, and adjust the parameters of the unit to be within the allowable range, so that the continuous operation of the unit is ensured, and the non-stop accident is avoided. However, after the heat supply or the industrial steam supply transformation is completed by partial thermal power, the RB control logic is not modified and optimized correspondingly, so that the electric load of the unit cannot actually reflect the actual output condition of the unit under the RB working condition, the RB action is likely to fail, and the risk of unit shutdown exists.
Aiming at hidden danger existing in the RB control strategy of the current steam extraction heat supply unit, a design method of the RB control strategy of the steam extraction heat supply thermal power unit needs to be provided, when the RB working condition occurs in the steam extraction heat supply unit, normal operation of the unit RB logic and normal operation of equipment can be ensured, and the RB working condition occurs normally. Especially when the RB working condition of the unit occurs, on the basis of guaranteeing the safety and stability of the RB working condition of the unit, the heat supply or the steam extraction of the unit is not influenced as much as possible.
Referring to fig. 1, a method for controlling fault load reduction of an auxiliary machine according to an embodiment of the present disclosure may include the following steps.
S110: under the condition that the working condition that auxiliary machine faults and load reduction occur in the steam extraction heat supply unit is detected, the unit electric load of the steam extraction heat supply unit and the steam extraction electric load representing the steam extraction flow of the steam extraction heat supply unit are obtained.
In this embodiment, when it is detected that an auxiliary machine fault load reduction (i.e., RB working condition) occurs in the steam extraction and heat supply unit, the operation mode of the unit is immediately switched to the turbine following mode, i.e., TF mode, and is put into the sliding pressure mode for operation. The initial control strategy of the unit does not realize undisturbed switching of constant pressure operation and sliding pressure operation, and the constant pressure mode and the sliding pressure mode cause larger disturbance to the system during switching. Therefore, a method for undisturbed switching of the operation mode of the steam extraction and heat supply unit under the condition of RB working condition needs to be provided.
In this embodiment, when the main auxiliary machine of the unit fails and trips to cause the real power of the unit to be limited (the coordination control system is in an automatic state), in order to adapt to the output of the equipment, the coordination control system forcibly reduces the load of the unit to a load target value which can be born by the auxiliary machine which is still running. This function of the coordinated control system is called an auxiliary machine failure load Reduction (RUNBACK), abbreviated as RB. Comprising the following steps: an air preheater RB, an induced draft fan RB, a furnace water circulating pump RB, a blower RB, a primary air blower RB and a water feeding pump RB.
In the embodiment, under the condition that the RB working condition of the steam extraction and heat supply unit is detected, the electric load of the steam extraction and heat supply unit and the steam extraction flow of the unit are monitored. And then converting the extraction flow of the unit into an electric load function to obtain the extraction electric load representing the extraction flow of the extraction heating unit.
S120: and generating target sliding pressure data of the steam extraction heat supply unit based on target electric load data obtained by adding the unit electric load and the steam extraction electric load.
In this embodiment, the electric load of the steam extraction heat supply unit and the steam extraction electric load are added to obtain the total electric load of the steam extraction heat supply unit as target electric load data. And then generating a sliding pressure curve of the steam extraction heat supply unit after the RB action occurs as target sliding pressure data based on the target electric load data.
S130: and calculating the sliding pressure data difference between the target sliding pressure data and preset sliding pressure data.
In this embodiment, if the difference between the target sliding pressure data and the preset sliding pressure data is too large, a large interference is brought to the main steam pressure setting of the steam extraction and heating unit. Therefore, the difference value operation can be performed on the target sliding pressure data and the preset sliding pressure data, so that the sliding pressure data difference between the target sliding pressure data and the preset sliding pressure data is obtained. The preset sliding pressure data are the sliding pressure data collected by the steam extraction heat supply unit under the non-RB working condition.
S140: and adding the target sliding pressure data and the sliding pressure data difference to obtain differential pressure compensation data.
In this embodiment, since the main gas pressure of the unit under the RB condition is small, differential pressure compensation is also required for the target sliding pressure data in order to switch from the sliding pressure operation state to the constant pressure operation state without disturbance. Therefore, the differential pressure compensation data for the target slip pressure data can be obtained by adding the slip pressure data difference obtained in the above embodiment to the target slip pressure data. And then, under the condition that the differential pressure compensation data is larger than a preset threshold value, undisturbed switching of the steam extraction heat supply unit from the sliding pressure operation to the constant pressure operation is realized.
S150: and under the condition that the sliding pressure data difference is smaller than or equal to a first preset threshold value and the differential pressure compensation data is larger than or equal to a second preset threshold value, switching the steam extraction heat supply unit from sliding pressure operation to constant pressure operation.
Referring to fig. 2, in this embodiment, by obtaining a unit electric load and a unit steam extraction flow of a steam extraction heat supply unit, converting the unit steam extraction flow into the steam extraction electric load, then under a condition that the steam extraction heat supply unit generates RB working condition, generating corresponding target sliding pressure data based on the unit electric load and the steam extraction electric load, calculating a sliding pressure data difference between the target sliding pressure data and preset sliding pressure data, and designing 2 AXSEL selection function logics, wherein one AXSEL selection function logic is used for comparing the sliding pressure data difference with a first preset threshold value, the other AXSEL selection function logic is used for comparing the target sliding pressure data after differential pressure compensation with a second preset threshold value, and when the sliding pressure data difference is smaller than or equal to the first preset threshold value and the differential pressure compensation data is smaller than or equal to the second preset threshold value, switching the steam extraction heat supply unit from a sliding pressure operation mode to a fixed pressure operation mode, thereby avoiding a large disturbance to a system caused by the sliding pressure undisturbed switching logic when the RB working condition occurs, and improving the stability of the heat supply unit under the condition that the auxiliary machinery can fail to some extent.
In one embodiment, under the condition that the fault of an auxiliary machine of the steam extraction and heat supply unit is monitored, acquiring the main steam flow of the steam extraction and heat supply unit; converting the main steam flow into a steam electrical load indicative of unit output; and sending a request signal for reducing the load of the auxiliary machine fault under the condition that the steam electric load is larger than or equal to a preset electric load.
In this embodiment, before RB control is performed on the steam extraction and heat supply unit, it is necessary to determine whether an RB condition currently occurs in the steam extraction and heat supply unit. Referring to fig. 3, a control strategy diagram of the induced draft fan RB of the steam extraction heat supply thermal power unit when working conditions of the induced draft fan RB occur is shown, input signals are an operation signal of the induced draft fan a and an operation signal of the induced draft fan B, a main steam flow signal of the steam extraction heat supply thermal power unit is detected, a steam electric load representing actual output of the steam extraction heat supply thermal power unit is obtained by carrying out heat load conversion on the main steam flow signal, then when the RB working conditions of the unit are limited, the output limit value of the unit is greater than 202.5MW, the operation signals of the induced draft fan a and the operation signals of the induced draft fan B are sent to a control logic after 3 seconds of delay, the control strategy of the induced draft fan RB is judged, and a request signal for fault load reduction of an auxiliary machine is sent.
In one embodiment, converting the main steam flow into a steam electrical load that characterizes unit output may include: performing lead-lag filtering processing on the main steam flow to obtain a target main steam flow; and converting the target main steam flow into a steam electric load representing the output of the unit.
In the present embodiment, the actual output of the reaction unit can be more accurately obtained to some extent by converting the electric load amount related to the RB control strategy into the boiler heat load.
In the embodiment, the high frequency of the process parameters greatly fluctuates, so that the operation stability of the steam extraction and heat supply unit can be affected to a certain extent, and the state parameters are properly regulated by utilizing the lead-lag function of the LEADLAG, so that the operation stability of the steam extraction and heat supply unit can be improved. The control strategy of the original RB of the steam extraction heat supply unit is modified, the triggering logic of the unit RB is modified, taking a 350MW steam extraction heat supply unit as an example, the triggering condition of the original design RB function is that the unit electric load is more than 202.5MW, the current main steam flow is converted into the unit output, and the main steam flow is divided by 3 to be about the actual output of the unit; the original design of the reset condition of the RB function is manual reset, 300s reset after the RB is triggered, and reset when the unit load is less than 10MW of the target load, and the unit load is also less than 10MW of the target load, and is modified into the actual unit output converted by the main steam flow; the target load after RB action is originally designed to be a power-on/induced-draft fan RB, a primary fan RB and a water-supply pump RB of 192.5MW, 2 pulverizing systems are reserved for 175MW in a coal mill RB, 3 pulverizing systems are reserved for 262.5MW, 1 pulverizing system is reserved for 87.5MW, and the target load is modified to be the unit time output converted by main steam.
In one embodiment, the control method for auxiliary machine fault load reduction may further include: and under the condition that the steam electric load is smaller than the preset electric load or the time of occurrence of the working condition of the auxiliary machine fault load reduction is longer than the preset time, starting the auxiliary machine fault load reduction reset.
In this embodiment, when the actual load of the steam extraction and heat supply unit is reduced to the target load, the RB function is reset. If the electric load of the steam extraction heat supply unit does not drop to the preset electric load within the preset time, under the condition that the RB working condition occurs for the preset time (such as 300 s), the reset logic of the RB working condition is realized, and the reset of the RB working condition is realized through the RS trigger.
In one embodiment, the control method for auxiliary machine fault load reduction may further include: and controlling a steam turbine regulating door of the steam extraction heat supply unit to be in a locking state until a request signal of auxiliary machine fault load reduction disappears or the auxiliary machine fault load reduction is reset.
In the embodiment, in terms of a control strategy, in order to avoid the condition that the load does not drop and rise reversely in the RB working condition, a valve regulating and locking is added in the control strategy, namely when the RB acts, the upper limit value of the main control output of the steam turbine is locked and limited, the valve regulating and opening is forbidden, and the whole process is continued until the RB acting signal disappears or the RB acts are reset.
In one embodiment, the control method for auxiliary machine fault load reduction may further include: and closing the steam extraction check valve and the steam extraction quick closing valve of the steam extraction heat supply unit, and opening the electric regulating valve and the electric closing valve of the steam extraction heat supply unit.
In the embodiment, the original RB control strategy design of the steam extraction heat supply unit considers that the unit operates under the pure condensation working condition, but part of the unit is subjected to heat supply transformation, and after the heat supply network is put into operation, the original RB control strategy is difficult to meet the requirements of the unit operation working condition. The control strategy of the original design is that the heat supply network system exits during the steam extraction and heat supply of the unit, so that the influence on the safe operation of the unit is great, when the unit generates an RB working condition, an RB command is sent to quickly close a steam extraction quick-closing valve and a check valve of the heat supply network, and an adjusting butterfly valve and an electric shutoff valve are opened.
In one embodiment, closing the steam extraction check valve and the steam extraction quick closing valve of the steam extraction heat supply unit may include: closing the steam extraction check valve under the condition that the time of the working condition of the auxiliary machine fault load reduction reaches a first preset time; and closing the steam extraction quick closing valve under the condition that the working condition of the auxiliary machine fault load reduction occurs for a second preset time.
In the embodiment, the electric butterfly valve of the unit needs approximately 600s to be fully opened, and the electric shutoff valve needs 200s to be fully opened, so after the RB working condition occurs, the electric butterfly valve is opened for a long time, a large amount of steam cannot enter the low-pressure cylinder, and the steam exhaust pressure of the medium-pressure cylinder is rapidly increased. Meanwhile, the unit is immediately switched into a steam turbine following mode by a load control mode, the extraction steam quantity of a heat supply network can fully enter a low-pressure cylinder, the valve regulating valve of the unit is small, the main steam pressure can continuously rise, the extraction steam quantity can also influence the rotating speed of a water feeding pump steam turbine, the steam source of the water feeding pump steam turbine is supplied by the exhaust steam of a medium-pressure cylinder, the rising of the exhaust steam pressure of the medium-pressure cylinder can cause the rising of the rotating speed of the water feeding pump to influence the water feeding flow of the water feeding pump steam turbine, in addition, the extraction steam of the heat supply network enters the low-pressure cylinder to apply work, the load of the unit is reduced slowly, and the adjustment of fuel is accelerated. According to the analysis of the operation condition of the steam extraction and heat supply unit, after RB occurs, the load and main steam pressure of the unit slowly rise for about 10 seconds and then decline, if at this moment, the steam extraction quick-closing valve and the check valve of the heat supply network are immediately closed, the steam extraction flow of the heat supply network can enter the low-pressure cylinder to apply work, and the load of the unit can be greatly influenced.
Referring to fig. 4, when the RB working condition occurs in the unit, the first preset time is set to 10s, that is, 10s delay is added to the quick valve closing instruction of the heat supply network. And setting the second preset time to 8s, namely adding 8s delay to the closing instruction of the check valve, and synchronizing with the slow rising of the main steam pressure. The electric regulating valve and the electric quick-acting valve are unchanged in logic, which is equivalent to that the random group operation naturally reduces the load of the heat supply network, the steam in the heat supply network pipeline cannot return to the steam turbine, the exhaust pressure of the medium pressure cylinder cannot continuously rise, the rotating speed of the water supply steam turbine is easy to control, and the machine set can be replaced to provide guarantee for safe and stable operation.
In one embodiment, generating the target slip pressure data of the steam extraction heat supply unit based on the target electrical load data obtained by adding the unit electrical load and the steam extraction electrical load may include: adding the unit electric load and the steam extraction electric load to obtain target electric load data; establishing a conversion relation model for converting the thermal load of the steam extraction heat supply unit into an electric load; and inputting the target electric load data into the conversion relation model to obtain target sliding pressure data of the steam extraction heat supply unit.
In this embodiment, considering the correctness of the logical action of the RB of the steam extraction and heating unit, the sliding pressure target pressure set point curve under the RB working condition is modified from the original electric load corresponding to the main steam pressure of the unit to the electric load corresponding to the heat load conversion, according to the main steam conversion function, the conversion relationship is that the 29t/h steam flow corresponds to the 10MW electric load, and the RB working condition sliding pressure curve is shown in the attached table 1. The original design of the main steam pressure set value under the RB working condition is shown in an attached table 1, and the main steam pressure set value under the RB working condition is modified into an attached table 2.
The original design load of the RB working condition of the attached table 1 corresponds to the set value of the main steam pressure
Figure SMS_1
RB working condition load after modification of the attached table 2 corresponds to the main steam pressure set value
Figure SMS_2
Converting the electric load quantity related in the original RB control strategy into the boiler heat load, and more accurately reacting the actual output of the unit; secondly, considering that a sliding pressure curve in the running process of the unit is influenced by load quantity, comprehensively considering the current heat supply quantity of the unit, and converting the current heat load to an electric load to obtain a sliding pressure running function curve adapting to the current working condition of the unit; and thirdly, the butterfly valve for steam extraction and heat supply is optimized in control strategy, and the current opening of the butterfly valve for heat supply is maintained under the RB working condition, so that the RB working condition is prevented from being further deteriorated due to the fact that the steam extraction and heat supply of the unit is withdrawn. The design method of the RB control strategy of the steam extraction heat supply unit eliminates the condition that the actual output of the unit is not matched with the original RB control strategy in the process of the unit RB in the production field, particularly the trigger load and the reset load in the RB control strategy, and the action condition of the steam extraction disc after the RB working condition occurs is comprehensively considered according to the unit sliding pressure operation curve after the RB working condition occurs. The risk of shutdown of the steam extraction heat supply unit when the RB working condition occurs is effectively avoided, and the reliability of safe and stable operation of the steam extraction heat supply unit is improved.
Referring to fig. 5, an embodiment of the present disclosure further provides an apparatus for controlling fault load reduction of an auxiliary machine, where the apparatus may include: the system comprises a data acquisition unit, a sliding pressure data generation unit, a differential pressure calculation unit, a differential pressure compensation unit and an operation mode switching unit.
The data acquisition unit is used for acquiring the unit electric load of the steam extraction heat supply unit and the steam extraction electric load representing the steam extraction flow of the steam extraction heat supply unit under the condition that the auxiliary machine fault load reduction occurs in the steam extraction heat supply unit is detected.
And the sliding pressure data generating unit is used for generating target sliding pressure data of the steam extraction heat supply unit based on target electric load data obtained by adding the unit electric load and the steam extraction electric load.
And the differential pressure calculation unit is used for calculating the sliding pressure data difference between the target sliding pressure data and preset sliding pressure data.
And the differential pressure compensation unit is used for adding the target sliding pressure data and the sliding pressure data difference to obtain differential pressure compensation data.
And the operation mode switching unit is used for switching the steam extraction heat supply unit from the sliding pressure operation to the constant pressure operation under the condition that the sliding pressure data difference is smaller than or equal to a first preset threshold value and the differential pressure compensation data is larger than or equal to a second preset threshold value.
Specific functions and effects achieved by the auxiliary machine fault load reduction control device can be explained in reference to other embodiments of the present specification, and are not described herein. The modules in the auxiliary machine fault load reduction control device can be all or partially realized by software, hardware and a combination thereof. The modules can be embedded in hardware or independent of a processor in the computer device, or can be stored in a memory in the computer device in a software mode, so that the processor can call and execute the operations corresponding to the modules.
Referring to fig. 6, an embodiment of the present disclosure further provides an electronic device, where the electronic device includes a processor and a memory, where the memory is configured to store a computer program, and when the computer program is executed by the processor, the method for controlling load reduction of an auxiliary machine fault is implemented.
The processor may be a central processing unit (Central Processing Unit, CPU). The processor may also be any other general purpose processor, digital signal processor (Digital Signal Processor, DSP), application specific integrated circuit (Application Specific Integrated Circuit, ASIC), field programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof.
The memory, as a non-transitory computer readable storage medium, may be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as program instructions/modules, corresponding to the methods in embodiments of the present invention. The processor executes various functional applications of the processor and data processing, i.e., implements the methods of the method embodiments described above, by running non-transitory software programs, instructions, and modules stored in memory.
The memory may include a memory program area and a memory data area, wherein the memory program area may store an operating system, at least one application program required for a function; the storage data area may store data created by the processor, etc. In addition, the memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some implementations, the memory optionally includes memory remotely located relative to the processor, the remote memory being connectable to the processor through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
An embodiment of the present disclosure further provides a computer readable storage medium for storing a computer program, where the computer program is executed by a processor to implement the above-mentioned control method for reducing load of an auxiliary machine fault.
Those skilled in the art will appreciate that implementing all or part of the processes in the methods of the embodiments may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise processes of embodiments of the methods as described herein. Any reference to memory, storage, database, or other medium used in the implementations provided herein can include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, or the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like.
It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The various embodiments of the present disclosure are described in a progressive manner. The different embodiments focus on describing different portions compared to other embodiments. Those skilled in the art will appreciate, after reading the present specification, that a plurality of embodiments of the present specification and a plurality of technical features disclosed in the embodiments may be combined in a plurality of ways, and for brevity of description, all of the possible combinations of the technical features in the embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, it should be considered as the scope described in the present specification.
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 one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
The various embodiments in this specification are themselves focused on differing portions from other embodiments, and the various embodiments may be explained in cross-reference to one another. Any combination of the various embodiments in the present specification is encompassed by the disclosure of the present specification by a person of ordinary skill in the art based on general technical knowledge.
The foregoing is merely illustrative of the present invention and is not intended to limit the scope of the claims. Various modifications and changes may occur to those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which fall within the spirit and principles of the present invention are intended to be included within the scope of the claims.

Claims (11)

1. A control method for auxiliary machine fault load reduction, the method comprising:
under the condition that the working condition that auxiliary machine faults occur to the steam extraction heat supply unit and load is reduced is detected, acquiring the unit electric load of the steam extraction heat supply unit and the steam extraction electric load representing the steam extraction flow of the steam extraction heat supply unit;
generating target sliding pressure data of the steam extraction heat supply unit based on target electric load data obtained by adding the unit electric load and the steam extraction electric load;
calculating a sliding pressure data difference between the target sliding pressure data and preset sliding pressure data;
adding the target sliding pressure data and the sliding pressure data difference to obtain differential pressure compensation data;
and under the condition that the sliding pressure data difference is smaller than or equal to a first preset threshold value and the differential pressure compensation data is larger than or equal to a second preset threshold value, switching the steam extraction heat supply unit from sliding pressure operation to constant pressure operation.
2. The method according to claim 1, wherein the method further comprises:
under the condition that the auxiliary machine of the steam extraction heat supply unit is monitored to be faulty, acquiring the main steam flow of the steam extraction heat supply unit;
converting the main steam flow into a steam electrical load indicative of unit output;
transmitting a request signal for auxiliary machine fault load reduction under the condition that the steam electric load is larger than or equal to a preset electric load; the request signal is used for representing the working condition of auxiliary machine fault load reduction of the steam extraction heat supply unit.
3. The method of claim 2, wherein converting the main steam flow into a steam electrical load that characterizes a unit output comprises:
performing lead-lag filtering processing on the main steam flow to obtain a target main steam flow;
and converting the target main steam flow into a steam electric load representing the output of the unit.
4. The method according to claim 2, wherein the method further comprises:
and under the condition that the steam electric load is smaller than the preset electric load or the time of occurrence of the working condition of the auxiliary machine fault load reduction is longer than the preset time, starting the auxiliary machine fault load reduction reset.
5. The method according to claim 2, wherein the method further comprises:
and controlling a steam turbine regulating door of the steam extraction heat supply unit to be in a locking state until a request signal of auxiliary machine fault load reduction disappears or the auxiliary machine fault load reduction is reset.
6. The method according to claim 1, wherein the method further comprises:
and controlling the steam extraction check valve and the steam extraction quick closing valve of the steam extraction heat supply unit to be closed, and controlling the electric regulating valve and the electric closing valve of the steam extraction heat supply unit to be opened.
7. The method of claim 6, wherein controlling the closing of the extraction check valve and the extraction quick-closing valve of the extraction and heating unit comprises:
when the time of the working condition of the auxiliary machine fault load reduction reaches a first preset time, the steam extraction check valve is controlled to be closed;
and under the condition that the time of the working condition of the auxiliary machine fault load reduction reaches the second preset time, the steam extraction quick closing valve is controlled to be closed.
8. The method of claim 1, wherein generating target slip pressure data for the extraction and heating unit based on target electrical load data obtained by summing the unit electrical load and the extraction electrical load comprises:
adding the unit electric load and the steam extraction electric load to obtain target electric load data;
establishing a conversion relation model for converting the thermal load of the steam extraction heat supply unit into an electric load;
and inputting the target electric load data into the conversion relation model to obtain target sliding pressure data of the steam extraction heat supply unit.
9. An auxiliary machine fault load reduction control device, characterized in that the auxiliary machine fault load reduction control device comprises:
the data acquisition unit is used for acquiring the unit electric load of the steam extraction heat supply unit and the steam extraction electric load representing the steam extraction flow of the steam extraction heat supply unit under the condition that the auxiliary machine fault load reduction occurs in the steam extraction heat supply unit is detected;
the sliding pressure data generating unit is used for generating target sliding pressure data of the steam extraction heat supply unit based on target electric load data obtained by adding the unit electric load and the steam extraction electric load;
a differential pressure calculation unit for calculating a slip pressure data difference between the target slip pressure data and preset slip pressure data;
the differential pressure compensation unit is used for adding the target sliding pressure data and the sliding pressure data difference to obtain differential pressure compensation data;
and the operation mode switching unit is used for switching the steam extraction heat supply unit from the sliding pressure operation to the constant pressure operation under the condition that the sliding pressure data difference is smaller than or equal to a first preset threshold value and the differential pressure compensation data is larger than or equal to a second preset threshold value.
10. An electronic device, characterized in that the electronic device arrangement comprises a processor and a memory for storing a computer program which, when executed by the processor, implements the method according to any of claims 1 to 8.
11. A computer readable storage medium for storing a computer program which, when executed by a processor, implements the method of any one of claims 1 to 8.
CN202310321153.5A 2023-03-27 2023-03-27 Auxiliary machine fault load reduction control method, device, equipment and storage medium Pending CN116436095A (en)

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