阅读说明：本技术 功热电汽轮机事故工况快速响应系统 (Quick response system for accident condition of power thermoelectric turbine ) 是由 刘波 郑博 李晓雷 杨光 王悦威 杨帆 魏成军 于 2021-08-30 设计创作，主要内容包括：本发明公开了一种功热电汽轮机事故工况快速响应系统,包括连接在功热电汽轮机的测量仪表上用于接收现场仪表参数信号的高速数据采集卡、用于根据采集的参数信号进行分析并生成动作指令的精准控制子系统和用于接收动作指令输出给功热电汽轮机调整机构的高速输出卡,高速数据采集卡的输入端连接测量仪表的输出端,高速数据采集卡的输出端连接精准控制子系统的输入端,精准控制子系统的输出端连接高速输出卡的输入端,高速输出卡的输出端连接功热电汽轮机调整机构的输入端。本发明降低了功热电汽轮机事故工况对运行机组和主机系统的影响,保证了供热期间主机系统的安全稳定运行,提升了电网及热网的稳定性。(The invention discloses a power thermoelectric turbine accident condition quick response system which comprises a high-speed data acquisition card, a precision control subsystem and a high-speed output card, wherein the high-speed data acquisition card is connected to a measuring instrument of a power thermoelectric turbine and used for receiving field instrument parameter signals, the precision control subsystem is used for analyzing and generating action instructions according to the acquired parameter signals, the high-speed output card is used for receiving the action instructions and outputting the action instructions to a power thermoelectric turbine adjusting mechanism, the input end of the high-speed data acquisition card is connected with the output end of the measuring instrument, the output end of the high-speed data acquisition card is connected with the input end of the precision control subsystem, the output end of the precision control subsystem is connected with the input end of the high-speed output card, and the output end of the high-speed output card is connected with the input end of the power thermoelectric turbine adjusting mechanism. The invention reduces the influence of the accident condition of the power thermoelectric turbine on the running unit and the host system, ensures the safe and stable running of the host system during heat supply and improves the stability of the power grid and the heat supply network.)

1. Quick response system of merit thermoelectric turbine accident operating mode, its characterized in that: the high-speed data acquisition card (3) is connected to a measuring instrument (2) of the power thermoelectric turbine and used for receiving field instrument parameter signals, the high-speed data acquisition card (4) is used for analyzing and generating action instructions according to the acquired parameter signals, and the high-speed output card (5) is used for receiving the action instructions and outputting the action instructions to a power thermoelectric turbine adjusting mechanism (1).

2. The system according to claim 1, wherein the system comprises: the measuring instrument (2) comprises an intake adjusting opening measuring instrument, an intake pressure measuring instrument, an intake closing door position measuring instrument and a lubricating oil measuring instrument which are independently arranged on site, and the output ends of the intake adjusting opening measuring instrument, the intake pressure measuring instrument, the intake closing door position measuring instrument and the lubricating oil measuring instrument are respectively connected with the input end of the high-speed acquisition card (3).

3. The system according to claim 1, wherein the system comprises: the adjusting mechanism (1) of the power thermoelectric turbine comprises two execution functions of a normal switch and a quick switch.

4. The system according to claim 1, wherein the system comprises: the workflow of the quick response system comprises the following steps:

A. firstly, setting protection action values of parameters such as the opening of an air inlet adjusting valve, air inlet pressure, the position of a shut-off door, lubricating oil pressure and the like of the power thermoelectric turbine;

B. the accurate control subsystem monitors parameter information of the power and thermoelectric turbine in real time, and when the monitored parameter information exceeds a set protection action value, the accident condition is judged, and an accident state signal of the power and thermoelectric turbine is generated; the accurate control subsystem monitors the load of each power and thermoelectric turbine in real time, and calculates the ratio of the driving air quantity to the driving air quantity of each power and thermoelectric turbine according to the corresponding relation between the load and the driving air quantity;

C. a control response subprogram in the accurate control subsystem is combined with the accident state of the power and thermoelectric turbine in the accident state, the accident reason and the driving steam quantity of the power and thermoelectric turbine to generate a response program which is suitable for the flow characteristic of a driving gas source and corresponds to the accident working condition, and corresponding adjustment instructions S1, S2, S3, S4, S5 and S6 are generated;

D. the precise control subsystem monitors the power generation current value of each power and thermoelectric turbine in real time, compares the measured current with a fixed value e, and outputs a locking and lifting adjusting signal in the running unit when the current is greater than e;

E. after the adjustment commands S1, S2, S3 and S4 are compared and selected, an air inlet adjustment valve opening command for operating the power and thermoelectric turbine is output, and whether the adjustment command is an opening direction command is further judged according to the opening command; when the opening degree instruction is judged not to be the opening direction instruction, outputting the opening degree instruction to an output ratio selection module; when the opening instruction is an opening instruction, combining the existence of an adjusting locking ascending signal in the running unit, and outputting an instruction that the adjusting door of the running unit is closed to the existing opening g% to an output comparison module;

F. the adjusting instruction S5 is combined with the current value of the running unit to be compared with a fixed value f, and when the current value is not greater than the fixed value f, an adjusting door is closed to an h% instruction and then the h% instruction is output to an output comparison module; when the current value is larger than the fixed value f, outputting a command that the adjusting gate is closed to k% to an output comparison module;

G. an adjusting instruction S6 is output to an output comparison module when the shutdown valve of the running unit is closed;

H. and the output comparison and selection module outputs the final instruction to the high-speed output card.

Technical Field

The invention relates to the technical field of heat supply units, in particular to a quick response system for accident conditions of a power thermoelectric turbine.

Background

The power thermoelectric turbine is used to replace the temperature and pressure reducing device in the heating and steam extracting heating system of the original heat supply unit, and the main machine heating system is used for heating and steam extraction to drive the power thermoelectric turbine to drill holes and further drive the small-sized generator to generate electricity. For a 300MW heat supply unit, one power and heat power turbine can be dragged to fall according to different heating steam extraction quantities.

The existing work thermoelectric turbines are controlled in a single mode, namely, no control relation exists between the work thermoelectric turbines. And the accident condition control of two or more conventional power and thermoelectric steam turbines depends on a DCS system, the response of the steam turbine set under the accident condition is realized through software and hardware of the DCS system, the response time is usually more than 500ms, the response time is slow, the influence of the accident condition of the power and thermoelectric steam turbines on the running set and a host system is improved, and the stability of a power grid and a heat supply network cannot be ensured.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a quick response system for accident conditions of a power and thermoelectric turbine, which monitors important operation parameters of a plurality of power and thermoelectric turbines, and when one or more power and thermoelectric turbines suddenly changes in load or trips, operates a response strategy of the power and thermoelectric turbines, so that the response time is prolonged. .

In order to solve the technical problems, the technical scheme adopted by the invention is as follows.

The system comprises a high-speed data acquisition card, an accurate control subsystem and a high-speed output card, wherein the high-speed data acquisition card is connected to a measuring instrument of the power thermoelectric turbine and used for receiving parameter signals of a field instrument, the accurate control subsystem is used for analyzing and generating action instructions according to the acquired parameter signals, the high-speed output card is used for receiving the action instructions and outputting the action instructions to a power thermoelectric turbine adjusting mechanism, the input end of the high-speed data acquisition card is connected with the output end of the measuring instrument, the output end of the high-speed data acquisition card is connected with the input end of the accurate control subsystem, the output end of the accurate control subsystem is connected with the input end of the high-speed output card, and the output end of the high-speed output card is connected with the input end of the power thermoelectric turbine adjusting mechanism.

Above-mentioned merit thermoelectric turbine accident condition quick response system, measuring instrument includes the steam admission adjustment door opening measuring instrument, steam admission pressure measuring instrument, the steam admission shutoff door position measuring instrument and the lubricating oil measuring instrument that the scene was independently arranged, and the input of high-speed collection card is connected respectively to steam admission adjustment door opening measuring instrument, steam admission pressure measuring instrument, the output of steam admission shutoff door position measuring instrument and lubricating oil measuring instrument.

According to the power and thermoelectric turbine accident condition quick response system, the power and thermoelectric turbine adjusting mechanism comprises two execution functions of a normal switch and a quick switch.

The work flow of the quick response system comprises the following steps:

A. firstly, setting protection action values of parameters such as the opening of an air inlet adjusting valve, air inlet pressure, the position of a shut-off door, lubricating oil pressure and the like of the power thermoelectric turbine;

B. the accurate control subsystem monitors parameter information of the power and thermoelectric turbine in real time, and when the monitored parameter information exceeds a set protection action value, the accident condition is judged, and an accident state signal of the power and thermoelectric turbine is generated; the accurate control subsystem monitors the load of each power and thermoelectric turbine in real time, and calculates the ratio of the driving air quantity to the driving air quantity of each power and thermoelectric turbine according to the corresponding relation between the load and the driving air quantity;

C. a control response subprogram in the accurate control subsystem is combined with the accident state of the power and thermoelectric turbine in the accident state, the accident reason and the driving steam quantity of the power and thermoelectric turbine to generate a response program which is suitable for the flow characteristic of a driving gas source and corresponds to the accident working condition, and corresponding adjustment instructions S1, S2, S3, S4, S5 and S6 are generated;

D. the precise control subsystem monitors the power generation current value of each power and thermoelectric turbine in real time, compares the measured current with a fixed value e, and outputs a locking and lifting adjusting signal in the running unit when the current is greater than e;

E. after the adjustment commands S1, S2, S3 and S4 are compared and selected, an air inlet adjustment valve opening command for operating the power and thermoelectric turbine is output, and whether the adjustment command is an opening direction command is further judged according to the opening command; when the opening degree instruction is judged not to be the opening direction instruction, outputting the opening degree instruction to an output ratio selection module; when the opening instruction is an opening instruction, combining the existence of an adjusting locking ascending signal in the running unit, and outputting an instruction that the adjusting door of the running unit is closed to the existing opening g% to an output comparison module;

F. the adjusting instruction S5 is combined with the current value of the running unit to be compared with a fixed value f, and when the current value is not greater than the fixed value f, an adjusting door is closed to an h% instruction and then the h% instruction is output to an output comparison module; when the current value is larger than the fixed value f, outputting a command that the adjusting gate is closed to k% to an output comparison module;

G. an adjusting instruction S6 is output to an output comparison module when the shutdown valve of the running unit is closed;

H. and the output comparison and selection module outputs the final instruction to the high-speed output card.

Due to the adoption of the technical scheme, the technical progress of the invention is as follows.

The invention monitors important operation parameters of a plurality of power and heat steam turbines, depends on the processing capacity of a quick response system, operates the power and heat steam turbines at the same time, generates one or more load sudden changes or trips, and operates a response strategy of a unit. Compared with the conventional DCS, the DCS has the fault response time shortened to be within 10ms, the control reliability of the multiple power and thermoelectric turbines during simultaneous operation is greatly improved, the influence of accident conditions of the power and thermoelectric turbines on an operating unit and a host system is reduced, the safe and stable operation of the host system during heat supply is ensured, and the stability of a power grid and a heat supply network is improved.

Drawings

FIG. 1 is a block diagram of the present invention;

fig. 2 is a flow chart of the operation of the present invention.

Wherein: 1. the system comprises a power thermoelectric turbine adjusting mechanism, 2, a measuring instrument, 3, a high-speed data acquisition card, 4, an accurate control subsystem and 5, a high-speed output card.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

The power and thermoelectric turbine accident condition quick response system is shown in a structural block diagram in fig. 1 and comprises a high-speed data acquisition card 3, a precise control subsystem 4 and a high-speed output card 5, wherein the input end of the high-speed data acquisition card 3 is connected to a measuring instrument 2 of the power and thermoelectric turbine, the output end of the high-speed data acquisition card 3 is connected with the input end of the precise control subsystem 4, the output end of the precise control subsystem 4 is connected with the input end of the high-speed output card 5, and the output end of the high-speed output card 5 is connected with the input end of a power and thermoelectric turbine adjusting mechanism 1.

The measuring instrument 2 of the power thermoelectric turbine is a power thermoelectric turbine system which runs in parallel, important parameter measuring instruments such as an air inlet adjusting door opening degree measuring instrument, an air inlet pressure measuring instrument, an air inlet closing door position measuring instrument and a lubricating oil measuring instrument are independently arranged on the site, and parameter signals of the measuring instruments are connected to the high-speed data acquisition card 3 through signal lines.

The high-speed data acquisition card 3 receives the parameter signal measured by the field instrument, converts the parameter signal into a digital signal and outputs the digital signal to the precise control subsystem 4, and the complete scanning period of the high-speed data acquisition card 3 is less than or equal to 1 ms.

The accurate control subsystem 4 receives data from the high-speed data acquisition card 3, comprehensively analyzes and judges equipment parameters input by the high-speed data acquisition card through built-in logic, distinguishes different accident states, and finally generates an optimal response strategy and generates an action instruction.

The high-speed output card 5 receives an input digital signal from the precise control subsystem and then outputs the input digital signal to the power and thermoelectric turbine adjusting mechanism 1, and one complete scanning period of the high-speed output card is less than or equal to 1 ms.

The power and thermoelectric turbine adjusting mechanism 1 receives a control instruction from the high-speed output card 5, and the power and thermoelectric turbine adjusting mechanism 1 comprises two execution capacities of a normal switch and a fast switch.

The working flow chart of the invention is shown in fig. 2, the logic program in the area a is an accident state judgment subprogram corresponding to each power and thermoelectric turbine, and the working flow comprises the following steps:

A. firstly, setting protection action values of parameters such as the opening of an air inlet adjusting valve, air inlet pressure, the position of a shut-off valve, lubricating oil pressure and the like of the power thermoelectric turbine.

B. The accurate control subsystem monitors important parameter information such as the steam admission regulating valve opening, the steam admission pressure, the closing door position, the lubricating oil pressure of the power thermoelectric steam turbine in real time, and when the monitoring value exceeds a set action protection value, the accident condition is judged, and an accident state signal of the power thermoelectric steam turbine is generated. The parameter limit values are respectively 10% of the opening degree of the air inlet adjusting valve, 20% of the air inlet pressure, and when the opening in-place signal of the closing valve is small, the pressure of the lubricating oil is lower than the action value.

The accurate control subsystem monitors the load of each power and thermoelectric turbine in real time, and calculates the ratio of the driving air quantity to the driving air quantity of each power and thermoelectric turbine according to the corresponding relation between the load and the driving air quantity.

C. And a control response subprogram (a/b/c/d) in the accurate control subsystem is combined with the accident state of the power and thermoelectric turbine in the accident state, the accident reason and the driving steam quantity of the power and thermoelectric turbine to generate a response program which is suitable for the flow characteristic of a driving gas source and corresponds to the accident working condition and is used for controlling the power and thermoelectric turbine to operate and respond to the accident working condition.

After the control subprogram a is subjected to logic operation of the accident response program, the single-side judgment and the double-side judgment of the regulating door of the accident power and thermoelectric turbine are combined at the same time, two response programs of single-side regulating door response and double-side regulating door response are distinguished, and a regulating instruction S1 and a regulating instruction S2 are further generated.

The control subprogram b generates an inlet steam pressure response program after the accident response program is logically operated, and further generates an adjusting instruction S3.

After the control subprogram c is subjected to logic operation of the accident response program, the judgment of the single side and the double sides of the shutdown door of the accident power thermoelectric turbine is combined at the same time, the two response programs of single-side shutdown door response and double-side shutdown door response are distinguished, and an adjusting instruction S4 and an adjusting instruction S5 are further generated.

The control subroutine generates a lubricating oil pressure response routine by logical operation of the accident response routine, and further generates an adjustment command S6.

The adjustment commands S1, S2, S3 and S4 in the control subprogram belong to output commands for dealing with the load fluctuation accident condition of the power and heat turbine. The adjustment commands S5 and S6 in the control subprogram belong to output commands for dealing with the trip accident condition of the power and heat turbine.

D. The precise control subsystem monitors the power generation current value of each power and thermoelectric turbine in real time, is used for comparing the measured current with a fixed value e and a fixed value f respectively under the precondition of operating unit adjustment under the accident condition, and outputs an adjustment locking and lifting signal of the operating unit when the current is greater than e.

E. After optional adjustment commands S1, S2, S3 and S4 are output, an opening command of an inlet steam adjusting valve of the power and thermoelectric turbine is operated, and whether the opening command is an opening direction command is further judged according to the opening command. When the opening degree instruction is judged not to be the opening direction instruction, outputting the opening degree instruction to an output ratio selection module; and when the opening instruction is an opening instruction, combining the existence of an adjusting locking ascending signal in the running unit, and outputting an instruction that the adjusting door of the running unit is closed to the existing opening g% to an output comparison and selection module.

F. The adjusting instruction S5 is combined with the current value of the running unit to be compared with a fixed value f, and when the current value is not greater than the fixed value f, an adjusting door is closed to an h% instruction and then the h% instruction is output to an output comparison module; when the current value is larger than the fixed value f, the adjusting gate is output to close to a k% command to the output comparison module.

G. The adjustment command S6 is output to the output selection module when the unit shutdown valve is in operation.

H. And the output comparison and selection module outputs the final instruction to the high-speed output card.