CN215633162U - Frequency modulation control system for intermediate reheating unit of thermal generator set - Google Patents
Frequency modulation control system for intermediate reheating unit of thermal generator set Download PDFInfo
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- CN215633162U CN215633162U CN202121275566.7U CN202121275566U CN215633162U CN 215633162 U CN215633162 U CN 215633162U CN 202121275566 U CN202121275566 U CN 202121275566U CN 215633162 U CN215633162 U CN 215633162U
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Abstract
The utility model discloses a frequency modulation control system of a middle reheating unit of a thermal generator set, which comprises a first power change instruction input module, an actual power instruction input module, a first processor, a first frequency modulation function module, a second power change instruction input module, a load regulator module, a steam turbine main control module and a boiler main control module, wherein the output end of the first power change instruction input module is connected with the input ends of the first processor and the second power change instruction input module, and the output end of the second power change instruction input module is connected with the input end of the first frequency modulation function module. When power disturbance occurs to a power grid, frequency fluctuation occurs to the power grid, the primary frequency modulation function is used as a basic function of the turbo generator unit, the primary frequency modulation of the unit is participated in through a feedforward adjustment mode of a high-pressure adjustment valve and a medium-pressure adjustment valve, and the unit safety and the unit variable load rate can be improved through a feedforward adjustment mode of a higher-pressure adjustment valve.
Description
Technical Field
The utility model relates to the field of unit control, in particular to a frequency modulation control system of an intermediate reheating unit of a thermal power generating unit.
Background
A typical conventional primary frequency modulation control strategy is: after the frequency or rotating speed deviation passes through the frequency difference function, the frequency or rotating speed deviation is directly acted into a steam turbine regulating valve instruction as a feedforward on one hand, and is superposed on a unit load instruction which passes through the amplitude limiting and speed limiting on the other hand, and the frequency or rotating speed deviation enters a power closed-loop control logic of a generator set as a total instruction. When the deviation between the rotating speed and the set value exceeds a certain value, the primary frequency modulation action of the unit is triggered. In the power control mode, after primary frequency modulation action, the primary frequency modulation component is directly superposed to control the high-modulation gate for adjustment. In addition, for preventing the too high deviation of the main steam pressure of the boiler, the energy imbalance between the boiler and the steam turbine is too large, the primary frequency modulation component is directly added to a load instruction, the main control of the boiler is controlled, the main control of the steam turbine is comprehensively adjusted, and the requirement of primary frequency modulation is further met.
In order to control the response speed of the high throttle, the current commonly used technical means include: the adjusting quality of the main steam pressure, the main steam temperature, the steam drum water level, the hearth pressure and the like under the rapid load change is improved as much as possible; however, when the unit is adjusted by adopting a high-speed governor to participate in primary frequency modulation action, the problem of threatening the safe operation of the steam turbine unit also occurs, such as: the problems of unit overload, turbine axial displacement change, large temperature change of a turbine axial thrust bearing and the like. Therefore, a frequency modulation control system of the intermediate reheating unit of the thermal generator set is needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a frequency modulation control system of an intermediate reheating unit of a thermal generator set. Because the primary frequency modulation function action of the unit has the characteristics of burstiness, rapidity and dynamics, the primary frequency modulation load adjustment component is generated by the primary frequency modulation loop of the unit, and after the primary frequency modulation load adjustment component is superposed with the total flow instruction of the steam turbine, the opening instruction of the high-pressure regulating valve is formed through the steam distribution function of the steam turbine and is limited by the operation condition of the steam turbine. The utility model can fully utilize the characteristic of large thermal inertia of the boiler reheater of the primary intermediate reheating unit, and utilize the medium-pressure adjusting valve to assist the high-pressure adjusting valve to participate in primary frequency modulation of the unit at the same time, thereby improving the adjusting performance of the control system of the intermediate reheating unit.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a frequency modulation control system of an intermediate reheating unit of a thermal generator set comprises a first power change instruction input module, an actual power instruction input module, a first processor, a first frequency modulation function module, a second power change instruction input module, a load regulator module, a steam turbine main control module and a boiler main control module, wherein the output end of the first power change instruction input module is connected with the input ends of the first processor and the second power change instruction input module, and the output end of the second power change instruction input module is connected with the input end of the first frequency modulation function module;
the output end of the first frequency modulation function module is connected with the input end of the first processor, the output end of the first processor is connected with the input end of the load regulator module, the output end of the load regulator module is connected with the steam turbine main control module and the input end of the boiler main control module, and the output end of the actual power instruction input module is connected with the second power change instruction input module and the input end of the boiler main control module.
Preferably, still include second frequency modulation function module, second treater, flow control module and valve position control module, steam turbine host system's output with the input of second treater is connected, the output of second frequency modulation function module with the input of second treater is connected, the output of second power change instruction input module with the input of second frequency modulation function module is connected, the output of second treater with flow control module's input is connected, flow control module's output with valve position control module's input is connected.
Preferably, the valve position control system further comprises a first valve position function module and a second valve position function module, and the output end of the valve position control module is connected with the input ends of the first valve position function module and the second valve position function module.
Preferably, the variable-pressure control valve further comprises a plurality of intermediate valves and a plurality of high-pressure valves, each intermediate valve is connected with the output end of the second valve position function module, and each high-pressure valve is connected with the output end of the first valve position function module.
Preferably, the number of the high-regulation doors is four, and the number of the middle-regulation doors is two.
Preferably, the first processor and the second processor are processors of the same type.
The utility model has the advantages that when power disturbance occurs to the power grid, the frequency fluctuation occurs to the power grid, the primary frequency modulation function is used as the basic function of the turbo generator set, the feedforward adjustment mode of the high-pressure adjusting steam valve and the medium-pressure adjusting steam valve participates in the primary frequency modulation of the set, and the feedforward adjustment mode of the high-pressure adjusting steam valve can improve the safety of the set and the variable load rate of the set, improve the primary frequency modulation adjustment quality, and has better popularization value.
Drawings
FIG. 1 is a block diagram of the present invention.
Reference numbers in the figures: the system comprises a first power change instruction input module 1, a practical power instruction input module 2, a first processor 3, a first frequency modulation function module 4, a second power change instruction input module 5, a load regulator module 6, a steam turbine main control module 7, a boiler main control module 8, a second frequency modulation function module 9, a second processor 10, a flow control module 11, a valve position control module 12, a first valve position function module 13, a second valve position function module 14, a middle adjusting valve 15 and a high adjusting valve 16.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1;
example one
A frequency modulation control system of an intermediate reheating unit of a thermal power generating unit comprises a first power change instruction input module 1, an actual power instruction input module 2, a first processor 3, a first frequency modulation function module 4, a second power change instruction input module 5, a load regulator module 6, a steam turbine main control module 7 and a boiler main control module 8, wherein the output end of the first power change instruction input module 1 is connected with the input ends of the first processor 3 and the second power change instruction input module 5, and the output end of the second power change instruction input module 5 is connected with the input end of the first frequency modulation function module 4;
the output end of the first frequency modulation function module 4 is connected with the input end of the first processor 3, the output end of the first processor 3 is connected with the input end of the load regulator module 6, the output end of the load regulator module 6 is connected with the input ends of the steam turbine main control module 7 and the boiler main control module 8, and the output end of the actual power instruction input module 2 is connected with the input ends of the second power change instruction input module 5 and the boiler main control module 8.
In this embodiment, the steam turbine further includes a second frequency modulation function module 9, a second processor 10, a flow control module 11, and a valve position control module 12, an output end of the steam turbine main control module 7 is connected to an input end of the second processor 10, an output end of the second frequency modulation function module 9 is connected to an input end of the second processor 10, an output end of the second power change instruction input module 5 is connected to an input end of the second frequency modulation function module 9, an output end of the second processor 10 is connected to an input end of the flow control module 11, and an output end of the flow control module 11 is connected to an input end of the valve position control module 12.
In this embodiment, the valve position control system further includes a first valve position function module 13 and a second valve position function module 14, and an output end of the valve position control module 12 is connected to input ends of both the first valve position function module 13 and the second valve position function module 14.
In this embodiment, the processor further includes a plurality of intermediate valves 15 and a plurality of high-pressure valves 16, each intermediate valve 15 is connected to the output end of the second valve position function module 14, each high-pressure valve 16 is connected to the output end of the first valve position function module 13, the number of the high-pressure valves 16 is four, the number of the intermediate valves 15 is two, and the first processor 3 and the second processor 10 are processors of the same type.
The working principle is as follows: on one hand, a power change instruction is input through a second power change instruction input module 5, and after the instruction is calculated by a first frequency modulation function module 4, the instruction is converted into a load demand instruction according to a rotating speed unequal rate and other first processors 3 and then is sent to a load regulator module 6; on the other hand, a power change instruction is input through the first power change instruction input module 1, an actual power instruction is input through the actual power instruction input module 2, an instruction deviation formed by the two instructions acts on the load regulator 6, the two instructions are superposed as an actual instruction to enter a load control logic of the load regulator module 6, and the instruction is sent to the steam turbine main control module 7 and the boiler main control module 8;
meanwhile, after being calculated by the second frequency modulation function module 9, the power change instruction input by the second power change instruction input module 5 is sent to the second processor 10 to be calculated into a steam turbine governing valve flow control signal, the steam turbine governing valve flow control signal is input into the flow control module 11, the steam turbine governing valve flow control signal is converted into a comprehensive valve position instruction signal through the flow control module 11 and input into the valve position control module 12, the valve position control module 12 sends the comprehensive valve position instruction signal to the first valve position function module 13 and acts on the high governing valve 16, namely GV1\ GV2\ GV3\ GV4 after being processed, and then acts on the medium governing valve 15, namely IV1\ IV2 after being processed by the second valve position function module 14, so that the opening degree of the steam turbine governing valve is directly caused.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.
Claims (6)
1. The frequency modulation control system of the intermediate reheating unit of the thermal generator set is characterized by comprising a first power change instruction input module (1), an actual power instruction input module (2), a first processor (3), a first frequency modulation function module (4), a second power change instruction input module (5), a load regulator module (6), a steam turbine main control module (7) and a boiler main control module (8), wherein the output end of the first power change instruction input module (1) is connected with the input ends of the first processor (3) and the second power change instruction input module (5), and the output end of the second power change instruction input module (5) is connected with the input end of the first frequency modulation function module (4);
the output of first frequency modulation function module (4) with the input of first treater (3) is connected, the output of first treater (3) with the input of load regulator module (6) is connected, the output of load regulator module (6) with steam turbine main control module (7) with the input of boiler main control module (8) all connects, the output of actual power instruction input module (2) with second power change instruction input module (5) with the input of boiler main control module (8) all connects.
2. The frequency modulation control system of the intermediate reheating unit of the thermal generator set according to claim 1, it is characterized by also comprising a second frequency modulation function module (9), a second processor (10), a flow control module (11) and a valve position control module (12), the output end of the steam turbine main control module (7) is connected with the input end of the second processor (10), the output end of the second frequency modulation function module (9) is connected with the input end of the second processor (10), the output end of the second power change instruction input module (5) is connected with the input end of the second frequency modulation function module (9), the output end of the second processor (10) is connected with the input end of the flow control module (11), the output end of the flow control module (11) is connected with the input end of the valve position control module (12).
3. A fm control system for a thermal power generating unit intermediate reheating unit according to claim 2, further comprising a first valve position function module (13) and a second valve position function module (14), wherein an output end of the valve position control module (12) is connected to input ends of the first valve position function module (13) and the second valve position function module (14).
4. A fm control system for a thermal power generating unit intermediate reheating unit according to claim 3, further comprising a plurality of intermediate gates (15) and a plurality of high gates (16), wherein each intermediate gate (15) is connected to an output of the second valve position function module (14), and each high gate (16) is connected to an output of the first valve position function module (13).
5. A frequency modulation control system of a thermal power generating unit intermediate reheating unit according to claim 4, wherein the number of the high-pressure regulating gates (16) is four, and the number of the medium-pressure regulating gates (15) is two.
6. A thermal power generating unit intermediate reheating unit frequency modulation control system according to any one of claims 2 to 5, wherein the first processor (3) and the second processor (10) are processors of the same type.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121275566.7U CN215633162U (en) | 2021-06-08 | 2021-06-08 | Frequency modulation control system for intermediate reheating unit of thermal generator set |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121275566.7U CN215633162U (en) | 2021-06-08 | 2021-06-08 | Frequency modulation control system for intermediate reheating unit of thermal generator set |
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