CN216564981U - System for preventing current transformer load from exceeding limit under master control state of current transformer - Google Patents
System for preventing current transformer load from exceeding limit under master control state of current transformer Download PDFInfo
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- CN216564981U CN216564981U CN202220223642.8U CN202220223642U CN216564981U CN 216564981 U CN216564981 U CN 216564981U CN 202220223642 U CN202220223642 U CN 202220223642U CN 216564981 U CN216564981 U CN 216564981U
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Abstract
The utility model discloses a system for preventing the overload of a converter in a master control state of the converter, wherein an ID block of a collected electric state of a motor is connected with an input end of an analog quantity switching selection module, an output end of the analog quantity switching selection module and an AI block of collected output power of a generator are connected with an input end of a second multiplication module, an output end of the second multiplication module and an output end of a first multiplication module are connected with an input end of a subtraction module, an output end of the subtraction module is connected with an input end of a third multiplication module, an output end of the third multiplication module is connected with an input end of an addition module, an output end of the addition module is connected with an input end of an amplitude limiting module, an output end of the amplitude limiting module is connected with an input end of a rate limiting module, and an output end of the rate limiting module is connected with an output end of a gate opening control signal of a BEST small steam turbine during the master control of the converter, the system can prevent the problem of overload of the converter.
Description
Technical Field
The utility model belongs to the field of thermal control of a small turbine with a small generator of a BEST of an ultra-supercritical secondary reheating coal-fired unit, and relates to a system for preventing the load of a converter from exceeding the limit in a master control state of the converter.
Background
Along with the continuous rise of economy in China, thermal power generation based on fossil energy such as coal and the like is still the foundation for mainly supporting social development, and simultaneously China faces the problems of resource shortage, large amount of harmful pollutants generated by coal-fired power generation and the like. In order to achieve the goals of carbon peak reaching and carbon neutralization, the key point is to improve the efficiency of the thermal power generating unit. Most newly-built thermal power generating units have high parameters, secondary reheating and other configurations, and the small steam turbines have the characteristic of high temperature and pressure in a steam source along with the continuous rising of the temperatures of main reheating steam and reheating steam in the operation process of the units. The single small turbine with pneumatic feed pump can result in the small turbine power being too high when operating at high load. In the normal operation process, a small turbine steam inlet regulating valve is required to be used for controlling the power of the small turbine, so that the steam inlet throttling loss is excessive, and in order to keep the steam inlet regulating valve in a reasonable opening range in the operation process of the small turbine, the small turbine only drives a steam-driven water feeding pump and cannot meet the current energy-saving and efficient idea. Therefore, the BEST small turbine of the novel million units is provided, when the 'converter master control' state is achieved, the BEST small turbine converts redundant output into electric energy through the small generator, and the requirement of station service power is met. And simultaneously, the load of the converter is limited, and the problem that the load of the converter exceeds the limit is prevented.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provides a converter overload prevention system in a master control state of a converter, which can prevent the problem of converter overload.
In order to achieve the aim, the system for preventing the load of the converter from exceeding the limit in the master control state of the converter comprises a function conversion module, a first multiplication module, an analog quantity switching selection module, a second multiplication module, a subtraction module, a third multiplication module, an addition module, an amplitude limiting module, a speed limiting module, a collected AI block of the actual rotating speed of the BEST small turbine, a collected AI block of the output power of a generator, a collected ID block of the electric state of a motor and a control signal output end of the opening degree of a throttle of the BEST small turbine during the master control of the converter, wherein the function conversion module is used for converting the input power of the generator into the output power of the generator;
the AI block of the collected BEST small turbine actual rotating speed is connected with the input end of the function transformation module, and the output end of the function transformation module is connected with the input end of the first multiplication module;
the output end of the subtraction module is connected with the input end of a third multiplication module, the output end of the third multiplication module is connected with the input end of an addition module, the output end of the addition module is connected with the input end of an amplitude limiting module, the output end of the amplitude limiting module is connected with the input end of a rate limiting module, and the output end of the rate limiting module is connected with the output end of a gate opening control signal of a BEST small steam turbine during main control of a converter.
When the motor state is 0, the output of the analog quantity switching selection module is X1, and X1 is 1; when the motor state is 1, the output of the analog quantity switching selection module is X2, and X2 is-1.
The clipping module has a clipping range of 76 to 100.
The utility model has the following beneficial effects:
when the converter load overrun prevention system is in specific operation in the master control state of the converter, the output power of a small generator is limited by controlling the opening degree of the throttle of the BEST small turbine, the master control state of the converter is always kept, the problem of overload of the converter is prevented, redundant output of the BEST small turbine is converted into electric energy through the small generator, the requirement of auxiliary power is met, the use efficiency of the BEST small turbine is improved, the coal consumption is effectively reduced, and the aims of energy conservation and emission reduction are fulfilled.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a schematic diagram of the minimum generator maximum output for the actual rotational speed of the BEST minimum turbine.
The system comprises a function transformation module 1, a first multiplication module 2, an analog quantity switching selection module 3, a second multiplication module 4, a subtraction module 5, a third multiplication module 6, an addition module 7, an amplitude limiting module 8, a rate limiting module 9, an AI block for collecting the actual rotating speed of the BEST small turbine A, an AI block for collecting the output power of a generator B, an ID block for collecting the electric state of a motor C and a throttle opening control signal output end of the BEST small turbine D during the main control of a converter D.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the utility model. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, the system for preventing the converter load from exceeding the limit in the converter master control state according to the present invention includes a function transformation module 1, a first multiplication module 2, an analog quantity switching selection module 3, a second multiplication module 4, a subtraction module 5, a third multiplication module 6, an addition module 7, an amplitude limiting module 8, a rate limiting module 9, an AI block a for collecting the actual rotation speed of the small BEST turbine, an AI block B for collecting the output power of the generator, an ID block C for collecting the electric state of the motor, and an output end D for controlling the opening degree of the gate of the small BEST turbine during the converter master control;
the AI block A of the collected BEST small turbine actual rotating speed is connected with the input end of the function transformation module 1, and the output end of the function transformation module 1 is connected with the input end of the first multiplication module 2;
the collected ID block C of the motor in the electric state is connected with the input end of the analog quantity switching selection module 3, the output end of the analog quantity switching selection module 3 and the collected AI block B of the output power of the generator are connected with the input end of the second multiplication module 4, the output end of the second multiplication module 4 and the output end of the first multiplication module 2 are connected with the input end of the subtraction module 5, the output end of the subtraction module 5 is connected with the input end of the third multiplication module 6, the output end of the third multiplication module 6 is connected with the input end of the addition module 7, the output end of the addition module 7 is connected with the input end of the amplitude limiting module 8, the output end of the amplitude limiting module 8 is connected with the input end of the rate limiting module 9, and the output end of the rate limiting module 9 is connected with the output end D of a gate opening control signal of a BEST small turbine during main control of a converter.
The specific working process of the utility model is as follows:
after the BEST small turbine is started in a motor mode, the throttle is opened to increase the speed to the warming-up rotating speed, and when the motor starting mode is selected, the rotating speed of the BEST small turbine is gradually increased by the aid of the power of the motor. And a 'converter control allowing' signal is sent out, the converter is in a 'converter master control' state at the moment, when the rotating speed of the BEST small steam turbine tends to be stable, the rotating speed can be continuously improved without the help of a motor, and the electric state of the motor disappears. The actual rotating speed of the small BEST turbine acquired at this time is used as the input of the function transformation module 1, the function transformation module 1 is used for calculating the actual rotating speed value of the small BEST turbine to the power upper limit value of the strain converter, and the corresponding relation between the actual rotating speed value and the power upper limit value of the strain converter is illustrated by fig. 2. The rotating speed of the BEST small turbine is calculated by using the function conversion module 1 from 2300r/min, the corresponding power is 11MW, and the higher the actual rotating speed of the BEST small turbine is, the higher the corresponding upper limit value of the power of the generator is. When the actual rotating speed of the BEST small turbine exceeds 4000r/min, the corresponding power reaches 19MW at the maximum. The output of the function transformation module 1 is the converter power upper limit value corresponding to the actual rotating speed of the current BEST small turbine, the converter power upper limit value is used as one input of the first multiplication module 2, the other input of the first multiplication module 2 is a constant 1, and the output of the first multiplication module 2 is the converter power upper limit value corresponding to the actual rotating speed of the final BEST small turbine.
Inputting the motor state of the motor into the analog quantity switching selection module 3, and when the motor state is 0, the output of the analog quantity switching selection module 3 is X1, and X1 is 1; when the motor state is 1, the output of the analog quantity switching selection module 3 is X2, and X2 is-1. After the BEST small turbine is started in a mode of the motor, after the rotating speed of the BEST small turbine is gradually stabilized, the state output of the motor is 0 and serves as the input of the analog quantity switching selection module 3, and the output of the analog quantity switching selection module 3 is 1; the output of the second multiplication module 4 is the actual power value.
The output of the subtraction module 5 is the difference between the upper power limit of the converter and the actual power, in addition, a constant 76 is input into the addition module 7 during the working process, and the output of the addition module 7 is the opening degree of the throttle of the BEST small turbine.
When the difference between the upper limit of the converter power and the actual power is closer to 0, the converter power is closer to 19MW at the moment, and in order to prevent the converter power from exceeding the limit, the switching valve of the BEST small turbine in a full-open state needs to be closed downwards, so that the output of the subtraction module 5 is closer to 0 at the moment, the value calculated by the third multiplication module 6 is closer to 0, and after the output of the subtraction module is calculated by the addition module 7, the opening degree of the switching valve of the BEST small turbine is controlled, and the opening degree state of the switching valve is reduced from 100 to 76 at the moment so as to prevent the converter power from exceeding the limit.
When the difference between the upper power limit of the converter and the actual power is larger, the power of the converter does not reach the highest power of 19MW at the moment, and the power of the converter can be improved by fully opening the regulating valve of the BEST small turbine. When the output of the subtraction module 5 is larger, the output value passing through the third multiplication module 6 is larger, and then the output value passes through the addition module 7 to control the opening degree of the throttle of the BEST small turbine, so that the opening degree of the throttle is always kept to be more than 100.
The output of the adding module 7 is the opening degree of the throttle of the steam turbine with the small BEST at the moment, and the range of the limiting module 8 is 76 to 100. When the output of the adding module 7 is larger than 100, the output of the amplitude limiting module 8 is still the maximum amplitude limiting value 100, so that the opening degree of the throttle of the BEST small turbine is controlled between 76 and 100 all the time to control the power of the converter.
The output of amplitude limiting module 8 is as the input of rate limiting module 9, makes the increase and decrease value of per minute 60 at most through rate limiting module 9 to prevent that the input value of rate limiting module 9 from changing at the excessive speed, then lead to BEST small steam turbine's accent door aperture swing frequency too fast, realize under the state of "converter master control", the accent door aperture of the small steam turbine of control BEST, prevent the purpose that converter power transfinites.
Claims (3)
1. A system for preventing the load of a converter from exceeding the limit in the master control state of the converter is characterized by comprising a function transformation module (1), a first multiplication module (2), an analog quantity switching selection module (3), a second multiplication module (4), a subtraction module (5), a third multiplication module (6), an addition module (7), an amplitude limiting module (8), a rate limiting module (9), an AI block A for collecting the actual rotating speed of a BEST small turbine, an AI block B for collecting the output power of a generator, an ID block (C) for collecting the electric state of the motor and a gate-adjusting opening control signal output end (D) for the BEST small turbine during the master control of the converter;
the AI block A of the collected BEST small turbine actual rotating speed is connected with the input end of the function transformation module (1), and the output end of the function transformation module (1) is connected with the input end of the first multiplication module (2);
the collected ID block (C) of the motor in the electric state is connected with the input end of an analog quantity switching selection module (3), the output end of the analog quantity switching selection module (3) and the collected AI block B of the output power of the generator are connected with the input end of a second multiplication module (4), the output end of the second multiplication module (4) and the output end of a first multiplication module (2) are connected with the input end of a subtraction module (5), the output end of the subtraction module (5) is connected with the input end of a third multiplication module (6), the output end of the third multiplication module (6) is connected with the input end of an addition module (7), the output end of the addition module (7) is connected with the input end of an amplitude limiting module (8), the output end of the amplitude limiting module (8) is connected with the input end of a rate limiting module (9), and the output end of the rate limiting module (9) is connected with a gate opening control signal output end (D) of a BEST small turbine during main control of a converter.
2. The system for preventing the converter overload in the master control state of the converter according to claim 1, wherein when the motor state is 0, the output of the analog quantity switching selection module (3) is X1, and X1 is 1; when the motor state is 1, the output of the analog quantity switching selection module (3) is X2, and X2 is-1.
3. The system for preventing overload of a converter in a master control state according to claim 1, wherein the limiter module (8) has a limiter range of 76 to 100.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220223642.8U CN216564981U (en) | 2022-01-26 | 2022-01-26 | System for preventing current transformer load from exceeding limit under master control state of current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220223642.8U CN216564981U (en) | 2022-01-26 | 2022-01-26 | System for preventing current transformer load from exceeding limit under master control state of current transformer |
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| CN216564981U true CN216564981U (en) | 2022-05-17 |
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| CN202220223642.8U Active CN216564981U (en) | 2022-01-26 | 2022-01-26 | System for preventing current transformer load from exceeding limit under master control state of current transformer |
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