CN113266469B - Combustion engine optimization control system and method based on distributed control system - Google Patents
Combustion engine optimization control system and method based on distributed control system Download PDFInfo
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- CN113266469B CN113266469B CN202110520032.4A CN202110520032A CN113266469B CN 113266469 B CN113266469 B CN 113266469B CN 202110520032 A CN202110520032 A CN 202110520032A CN 113266469 B CN113266469 B CN 113266469B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas- turbine plants for special use
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/003—Arrangements for testing or measuring
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- 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
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas- turbine plants for special use
- F02C6/04—Gas-turbine plants providing heated or pressurised working fluid for other apparatus, e.g. without mechanical power output
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas- turbine plants for special use
- F02C6/18—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas- turbine plants for special use using the waste heat of gas-turbine plants outside the plants themselves, e.g. gas-turbine power heat plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C9/00—Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants
Abstract
The invention discloses a gas turbine optimization control system and method based on a decentralized control system, belonging to the technical field of gas turbine set performance detection, wherein the distributed control system comprises the following steps: the combustion engine optimizing control system based on the distributed control system comprises: the distributed control device is at least provided with two distributed controllers, the distributed controllers are used for sending control instructions to a plurality of gas turbine units in the same field bus and used for regulating and controlling the gas turbine units in the same field bus, the distributed controllers are provided with a data acquisition module, a processing module and a control module, and meanwhile, a method is provided.
Description
Technical Field
The invention relates to the technical field of distributed control systems, in particular to a gas turbine optimization control system and method based on a distributed control system.
Background
The gas turbine set is a set which takes coal, oil or combustible gas as fuel, heats water in a boiler to increase the temperature, and pushes a gas turbine to generate electricity by using steam with certain pressure.
The turbine of the gas turbine uses combustible gas as fuel to push the gas turbine to operate and drive the load to do work, the tail gas of the fuel after combustion in the gas turbine to do work can heat water in the boiler to increase the temperature, and steam with certain pressure is used to push the conventional turbine to generate electricity.
At present, the performance of a large-scale thermal power generating unit is mostly calculated by optimizing boiler combustion, the optimal working condition of the combustion unit is determined by controlling the working condition of the boiler combustion, the optimal working condition is generally determined by the optimal excess air coefficient range of the boiler, the optimal sliding pressure fixed value of a steam turbine and the optimal equipment combination mode of an auxiliary equipment system, the mode can only determine the driving part of the combustion engine, the combustion engine cannot be effectively regulated and controlled, whether the combustion engine can reach the optimal working condition under the optimal working condition of the driving end or not is not dependent on the driving end, the self operating working condition of the combustion engine is also an important aspect, whether the combustion engine is stable and is in the optimal working condition or not is determined, and the performance of the large-scale thermal power generating unit is determined.
Disclosure of Invention
In view of the above, the present invention provides an optimized control system and method for a combustion engine based on a distributed control system, so as to overcome the above technical drawbacks.
The combustion engine optimizing control system based on the distributed control system comprises:
at least one group of combustion unit, wherein the combustion unit comprises a plurality of independent combustion engine units, two vibration displacement sensors which are vertical to each other are arranged on the measuring section of each combustion engine unit,
the distributed control device is at least provided with two distributed controllers, the distributed controllers are used for sending control instructions to a plurality of gas turbine units in the same field bus so as to regulate and control the gas turbine units in the same field bus,
the decentralized controller is provided with a data acquisition module, a processing module and a control module,
the data acquisition module is used for acquiring vibration signals in the horizontal and vertical directions on the measuring section of the gas turbine unit and fusing the acquired vibration signals to acquire multidirectional vibration signals and amplitude, frequency and phase information of the vibration signals in each direction;
the processing module respectively synthesizes the multidirectional vibration signals and amplitude, frequency and phase information of the vibration signals in each direction according to each main frequency component to obtain offset of rotors in a plurality of gas turbine units in the same field bus, load values of the gas turbine units in the same field bus are obtained according to output data of the rotors in the gas turbine units and the offset, and the control module sends control instructions to the gas turbine units in the same field bus through the load values to regulate and control working conditions preset at the driving end of the gas turbine unit in the same field bus.
Furthermore, the vibration displacement sensors are arranged on the rotor measuring sections, each rotor measuring section is at least provided with one group of vibration displacement sensors, and the arrangement directions of the corresponding groups of vibration displacement sensors are mutually perpendicular.
Furthermore, the data acquisition module is provided with a multi-channel signal acquisition unit and a data fusion unit, the multi-channel signal acquisition unit is respectively connected with the vibration displacement sensors on the measurement cross sections of the combustion engine units in the same field bus to acquire vibration signals in the horizontal and vertical directions on the measurement cross sections of the combustion engine units and transmit the vibration signals to the data fusion unit, and the data fusion unit fuses the acquired vibration signals to acquire multi-directional vibration signals and amplitude, frequency and phase information of the vibration signals in each direction.
Further, the processing module comprises a synthesis module, a two-dimensional spectrogram generating module, a judgment module and a comparison module,
the synthesis module is used for respectively synthesizing the multi-directional vibration signals and the amplitude, the frequency and the phase information of the vibration signals in each direction according to each main frequency component,
the two-dimensional spectrogram generating module is used for arranging the synthesis results according to the frequency sequence to form a two-dimensional spectrogram,
the judging module is used for judging the offset of the rotors in a plurality of combustion engine units in the same field bus according to the two-dimensional spectrogram,
the comparison module is used for comparing the offset with a set threshold value and acquiring the load values of a plurality of gas turbine units in the same field bus according to the comparison result.
Furthermore, an annular cache module is further arranged in the data acquisition module, the annular cache unit is connected with the multi-channel signal acquisition unit, and the annular cache unit applies for space according to the size of the acquired data, coordinates the occupation of the acquisition thread of the multi-channel signal acquisition unit, and directionally and quantitatively acquires vibration signals in the horizontal and vertical directions on the measurement section of the gas turbine unit.
The invention also provides a combustion engine optimization control method based on the distributed control system, which comprises the following steps:
at least one group of combustion machine set is arranged, the combustion machine set comprises a plurality of independent combustion machine units, two vibration displacement sensors which are vertical to each other are arranged on the measuring section of each combustion machine unit,
arranging a decentralized control device which is internally provided with at least two decentralized controllers, wherein the decentralized controllers are used for sending control commands to a plurality of combustion engine units in the same field bus so as to regulate and control the combustion engine units in the same field bus,
the decentralized controller is provided with a data acquisition module, a processing module and a control module,
the data acquisition module is used for acquiring vibration signals in the horizontal and vertical directions on the measuring section of the gas turbine unit and fusing the acquired vibration signals to acquire multidirectional vibration signals and amplitude, frequency and phase information of the vibration signals in each direction;
the control module sends control instructions to the plurality of gas turbine units in the same field bus through the load values so as to regulate and control working conditions preset at the driving ends of the gas turbine units in the same field bus.
Further, according to the two-dimensional spectrogram, the step of judging the offset of the rotors in the multiple combustion engine units in the same fieldbus specifically includes:
when a power frequency ellipse in the two-dimensional spectrogram is large and flat, the rotor in the gas turbine unit vibrates irregularly in height and at high frequency, the offset is large and irregular, and the load of the gas turbine unit exceeds the maximum critical state at the moment;
when a power frequency ellipse in the two-dimensional spectrogram is small and round and the power frequency ellipse tends to a round point, the rotor in the gas turbine unit vibrates regularly, the offset is small and regular, and the load of the gas turbine unit is gradually balanced in a region;
when the power frequency ellipse in the two-dimensional spectrogram is small and flat and the power frequency ellipse tends to be large, the rotor vibration in the combustion engine unit changes from low-frequency vibration to high-frequency vibration, the offset is changed from small and approximately regular to large and irregular offset, and the load of the combustion engine unit gradually becomes large at the moment.
Further, the threshold value is rated output data of a rotor of the engine unit and rated efficiency data of the engine unit estimated by a rated offset amount.
Further, the rated efficiency data is divided into different efficiency grades according to the same regulation and control proportion by using the lower limit value and the upper limit value of the rated efficiency data.
Furthermore, the control module is internally provided with an optimization control and adjustment unit which takes the current load values of the multiple combustion engine units in the same field bus and the efficiency levels corresponding to the current load values as input, and sends control instructions to the multiple combustion engine units in the same field bus so as to regulate and control working conditions preset at the driving ends of the combustion engine units in the same field bus.
The invention has the following beneficial effects: the operating condition of the combustion engine is obtained by measuring the offset of the rotor in the combustion engine unit, the operation of the combustion engine is controlled to be in the optimal condition by regulating and controlling the operating condition of the combustion engine per se, and the optimal operating condition of the driving part in the traditional technology is combined, so that the thermal power unit is optimally controlled.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic diagram of a decentralized control system according to an embodiment of the present invention;
FIG. 2 is a layout diagram of a vibration displacement sensor according to the present invention;
fig. 3 is a schematic diagram of the conversion of distance values measured by a vibration displacement sensor into a two-dimensional spectrogram according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a combustion engine optimization control method based on a decentralized control system, which comprises the following steps:
at least one group of combustion machine set is arranged, the combustion machine set comprises a plurality of independent combustion machine units, two vibration displacement sensors which are vertical to each other are arranged on the measuring section of each combustion machine unit,
arranging a decentralized control device which is internally provided with at least two decentralized controllers, wherein the decentralized controllers are used for sending control commands to a plurality of combustion engine units in the same field bus so as to regulate and control the combustion engine units in the same field bus,
the decentralized controller is provided with a data acquisition module, a processing module and a control module,
the data acquisition module is used for acquiring vibration signals in the horizontal and vertical directions on the measuring section of the gas turbine unit and fusing the acquired vibration signals to acquire multidirectional vibration signals and amplitude, frequency and phase information of the vibration signals in each direction;
the processing module respectively synthesizes multidirectional vibration signals and amplitude, frequency and phase information of the vibration signals in each direction according to each main frequency component, the synthesis results are arranged according to the frequency sequence to form a two-dimensional frequency spectrogram, the offset of rotors in a plurality of gas turbine units in the same field bus is judged according to the two-dimensional frequency spectrogram, the offset is compared with a set threshold value according to the offset, the load values of the plurality of gas turbine units in the same field bus are obtained according to the comparison result, and the control module sends out control instructions to the plurality of gas turbine units in the same field bus through the load values so as to regulate and control working conditions preset at the driving end of the gas turbine units in the same field bus.
In the foregoing, determining, according to the two-dimensional spectrogram, offset amounts of rotors in a plurality of combustion engine units in the same fieldbus specifically includes:
when a power frequency ellipse in the two-dimensional spectrogram is large and flat, the rotor in the gas turbine unit vibrates irregularly in height and at high frequency, the offset is large and irregular, and the load of the gas turbine unit exceeds the maximum critical state at the moment;
when a power frequency ellipse in the two-dimensional spectrogram is small and round and the power frequency ellipse tends to a round point, the rotor in the gas turbine unit vibrates regularly, the offset is small and regular, and the load of the gas turbine unit is gradually balanced in a region;
when the power frequency ellipse in the two-dimensional spectrogram is small and flat and the power frequency ellipse tends to be large, the rotor vibration in the gas turbine unit changes from low-frequency vibration to high-frequency vibration, the offset is changed from small and approximately regular to large and irregular offset, and the load of the gas turbine unit gradually becomes large at the moment;
when the power frequency ellipse in the two-dimensional spectrogram is small and flat, the rotor in the gas turbine unit vibrates irregularly and is in low-frequency vibration, the offset is large and irregular, and the load of the gas turbine unit is lower than the lowest critical state at the moment.
In the above, the threshold value is rated output data of a rotor of the engine unit and rated efficiency data of the engine unit estimated by a rated offset amount.
In the above, the rated efficiency data is divided into different efficiency levels according to the same regulation and control proportion by using the lower limit value to the upper limit value of the rated efficiency data.
In the above, the control module is provided with an optimization control and adjustment unit, and the optimization control and adjustment unit takes the current load values of the multiple combustion engine units in the same field bus and the efficiency levels corresponding to the current load values as input, and sends control instructions to the multiple combustion engine units in the same field bus, so as to regulate and control the working conditions preset at the driving ends of the combustion engine units in the same field bus.
Referring to fig. 1, the invention provides a combustion engine optimization control system based on a distributed control system, comprising: at least one group of combustion unit, wherein the combustion unit comprises a plurality of independent combustion engine units, two vibration displacement sensors which are vertical to each other are arranged on the measuring section of each combustion engine unit,
in the above, the vibration displacement sensor is an eddy current sensor, and the eddy current sensor works according to the eddy current effect, and belongs to an inductive measurement principle. The eddy current effect originates from the energy of the oscillating circuit. While eddy currents need to be formed in a conductive material. Therefore, in the invention, an alternating current is led into the coil in the probe of the eddy current sensor, a magnetic field can be formed around the coil of the probe, and if a conductor is put into the magnetic field, eddy current can be excited in the conductor according to the Faraday's law of electromagnetic induction. According to Lenz's law, the direction of the magnetic field of the eddy current is exactly opposite to that of the magnetic field of the coil, and the impedance value of the coil in the probe is changed, and the change of the impedance value is directly related to the distance between the coil and the measured object; after the sensor probe is connected to the data acquisition module, the data acquisition module can obtain the variation of the voltage value from the sensor probe, and based on the variation of the voltage value, the corresponding distance value is calculated, and the vibration signal is obtained according to the distance value.
The distributed control device is at least provided with two distributed controllers, the distributed controllers are used for sending control instructions to a plurality of gas turbine units in the same field bus so as to regulate and control the gas turbine units in the same field bus,
the decentralized controller is provided with a data acquisition module, a processing module and a control module,
the data acquisition module is used for acquiring vibration signals in the horizontal and vertical directions on the measurement section of the gas turbine unit and fusing the acquired vibration signals to acquire multidirectional vibration signals and amplitude, frequency and phase information of the vibration signals in each direction, and specifically refer to fig. 3;
the processing module respectively synthesizes the multidirectional vibration signals and amplitude, frequency and phase information of the vibration signals in each direction according to each main frequency component to obtain offset of rotors in a plurality of gas turbine units in the same field bus, load values of the gas turbine units in the same field bus are obtained according to output data of the rotors in the gas turbine units and the offset, and the control module sends control instructions to the gas turbine units in the same field bus through the load values to regulate and control working conditions preset at the driving end of the gas turbine unit in the same field bus.
Referring to fig. 2, fig. 2 exemplarily depicts the layout principle of the vibration displacement sensors, the vibration displacement sensors are arranged on the rotor measuring sections, and at least one group of vibration displacement sensors is arranged on each rotor measuring section, and the layout directions of the vibration displacement sensors of the corresponding group are perpendicular to each other.
In the above, the data acquisition module has a multi-channel signal acquisition unit and a data fusion unit, the multi-channel signal acquisition unit is respectively connected to the vibration displacement sensors on the measurement cross sections of the multiple combustion engine units in the same fieldbus to acquire vibration signals in the horizontal and vertical directions on the measurement cross sections of the combustion engine units and transmit the vibration signals to the data fusion unit, and the data fusion unit fuses the acquired multiple vibration signals to acquire the multi-directional vibration signals and amplitude, frequency and phase information of the vibration signals in each direction. According to the invention, two vibration displacement sensors which are vertical to each other are arranged on the cross section of the rotor, and the output signals of the vibration displacement sensors have high consistency, so that synchronous sampling of each channel is ensured when multi-channel signal acquisition data is triggered, and the frequency, amplitude and phase of a spectral line can be accurately determined after frequency domain conversion.
In the above, the processing module comprises a synthesis module, a two-dimensional spectrogram generating module, a judgment module and a comparison module,
the synthesis module is used for respectively synthesizing the multi-directional vibration signals and the amplitude, the frequency and the phase information of the vibration signals in each direction according to each main frequency component,
the two-dimensional spectrogram generating module is used for arranging the synthesis results according to the frequency sequence to form a two-dimensional spectrogram,
the judging module is used for judging the offset of the rotors in the multiple combustion engine units in the same field bus according to the two-dimensional spectrogram, and referring to fig. 3, fig. 3 exemplarily describes the two-dimensional spectrogram under four working conditions, the distance values measured by the vibration displacement sensors on the X axis and the Y axis under the first working condition (corresponding to the +1X two-dimensional spectrogram) are approximately the same, at this time, the operation state of the combustion engine is stable, the offset of the rotors is constant and small, and at this time, the load of the combustion engine is in a more balanced state. Under the second working condition (corresponding to a-2X two-dimensional spectrogram), the distance value measured by the vibration displacement sensor measured on the X axis is smaller than the distance value measured by the vibration displacement sensor measured on the Y axis, at the moment, the power frequency ellipse in the two-dimensional spectrogram is larger and flatter, and the load of the combustion engine unit is increased at the moment. Under a third working condition (corresponding to a-3X two-dimensional spectrogram), the distance value measured by the vibration displacement sensor on the X axis is smaller than the distance value measured by the vibration displacement sensor on the Y axis, at the moment, the power frequency ellipse in the two-dimensional spectrogram becomes larger and flatter than that under the second working condition, at the moment, the load of the combustion engine unit becomes larger than that under the second tool, when a fourth working condition is reached, (corresponding to a +4X two-dimensional spectrogram), the distance value measured by the vibration displacement sensor on the X axis is larger than that measured by the vibration displacement sensor on the Y axis, at the moment, the power frequency ellipse in the two-dimensional spectrogram becomes larger and flatter than that under the third working condition, and the load becomes larger and even exceeds the limit load.
With reference to the above analysis, the following rules were obtained by collecting a large amount of experimental data:
when the power frequency ellipse in the two-dimensional spectrogram is large and flat, the rotor in the gas turbine unit vibrates irregularly in height and at high frequency, the offset is large and irregular, and the load of the gas turbine unit exceeds the maximum critical state at the moment,
when a power frequency ellipse in the two-dimensional spectrogram is small and round and the power frequency ellipse tends to a round point, the rotor in the gas turbine unit vibrates regularly, the offset is small and regular, and the load of the gas turbine unit is gradually balanced in a region;
when the power frequency ellipse in the two-dimensional spectrogram is small and flat and the power frequency ellipse tends to be large, the rotor vibration in the gas turbine unit changes from low-frequency vibration to high-frequency vibration, the offset is changed from small and approximately regular to large and irregular offset, and the load of the gas turbine unit gradually becomes large at the moment;
when a power frequency ellipse in the two-dimensional spectrogram is small and flat, the rotor in the gas turbine unit vibrates irregularly and at low frequency, the offset is large and irregular, and the load of the gas turbine unit is lower than the lowest critical state (the state is generally in the initial stage of just running after starting the engine).
The comparison module is used for comparing the offset with a set threshold value and acquiring the load values of a plurality of gas turbine units in the same field bus according to the comparison result.
The method integrates and fuses the information collected by each vibration displacement sensor, fully utilizes the multi-directional vibration signals and the amplitude, frequency and phase information of the vibration signals in each direction, thereby realizing the identification capability of imbalance, low-frequency vibration and high-frequency vibration of the rotor of the combustion engine, acquiring the load capacity of the combustion engine in the running state and balancing the optimal running condition of the combustion engine through the load capacity.
Besides the above description, the invention can find the rotor fault of the gas turbine in time by measuring the offset of the rotor of the gas turbine, if each index of the gas turbine has different amount of reduction under the above operation condition, the fault identification capability of poor rotor centering, gas seal abrasion, support looseness, defect of the measuring surface and the like can also occur, and powerful support is provided for the advance troubleshooting.
In the above, an annular cache module is further arranged in the data acquisition module, the annular cache unit is connected with the multichannel signal acquisition unit, and the annular cache unit applies for space according to the size of the acquired data, coordinates the occupation of the acquisition thread of the multichannel signal acquisition unit, and directionally and quantitatively acquires vibration signals in the horizontal and vertical directions on the measurement section of the gas turbine unit.
The invention adopts the measurement of the offset of the rotor of the combustion engine to obtain the optimal operation condition of the combustion engine, and inputs matched power to drive under the optimal operation condition of the combustion engine, so that the whole thermal power generation system reaches the optimal operation condition.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The combustion engine optimizing control system based on the distributed control system is characterized by comprising the following components:
at least one group of combustion unit, wherein the combustion unit comprises a plurality of independent combustion engine units, two vibration displacement sensors which are vertical to each other are arranged on the measuring section of each combustion engine unit,
the distributed control device is at least provided with two distributed controllers, the distributed controllers are used for sending control instructions to a plurality of gas turbine units in the same field bus so as to regulate and control the gas turbine units in the same field bus,
the decentralized controller is provided with a data acquisition module, a processing module and a control module,
the data acquisition module is used for acquiring vibration signals in the horizontal and vertical directions on the measuring section of the gas turbine unit and fusing the acquired vibration signals to acquire multidirectional vibration signals and amplitude, frequency and phase information of the vibration signals in each direction;
the processing module respectively synthesizes the multidirectional vibration signals and amplitude, frequency and phase information of the vibration signals in each direction according to each main frequency component to obtain offset of rotors in a plurality of gas turbine units in the same field bus, load values of the gas turbine units in the same field bus are obtained according to output data of the rotors in the gas turbine units and the offset, and the control module sends control instructions to the gas turbine units in the same field bus through the load values to regulate and control working conditions preset at the driving end of the gas turbine unit in the same field bus.
2. A combustion engine optimizing control system based on a distributed control system according to claim 1, wherein the vibration displacement sensors are arranged on rotor measuring sections, and each rotor measuring section is provided with at least one group of vibration displacement sensors, and the arrangement directions of the vibration displacement sensors of the corresponding group are perpendicular to each other.
3. The combustion engine optimization control system based on the distributed control system according to claim 1, wherein the data acquisition module has a multi-channel signal acquisition unit and a data fusion unit, the multi-channel signal acquisition unit is respectively connected with the vibration displacement sensors on the measurement cross sections of the combustion engine units in the same fieldbus to acquire vibration signals in the horizontal and vertical directions on the measurement cross sections of the combustion engine units and transmit the vibration signals to the data fusion unit, and the data fusion unit fuses the acquired vibration signals to acquire multi-directional vibration signals and amplitude, frequency and phase information of the vibration signals in each direction.
4. The combustion engine optimization control system based on the distributed control system as claimed in claim 1, wherein the processing module comprises a synthesis module, a two-dimensional spectrogram generating module, a judgment module and a comparison module,
the synthesis module is used for respectively synthesizing the multi-directional vibration signals and the amplitude, the frequency and the phase information of the vibration signals in each direction according to each main frequency component,
the two-dimensional spectrogram generating module is used for arranging the synthesis results according to the frequency sequence to form a two-dimensional spectrogram,
the judging module is used for judging the offset of the rotors in a plurality of combustion engine units in the same field bus according to the two-dimensional spectrogram,
the comparison module is used for comparing the offset with a set threshold value and acquiring the load values of a plurality of gas turbine units in the same field bus according to the comparison result.
5. The combustion engine optimization control system based on the distributed control system according to claim 1, wherein an annular cache unit is further arranged in the data acquisition module, the annular cache unit is connected with the multi-channel signal acquisition unit, and the annular cache unit applies for space according to the size of the acquired data, coordinates occupation of an acquisition thread of the multi-channel signal acquisition unit, and directionally and quantitatively acquires vibration signals in the horizontal and vertical directions on the measurement section of the combustion engine unit.
6. The combustion engine optimization control method based on the distributed control system is characterized by comprising the following steps:
at least one group of combustion machine set is arranged, the combustion machine set comprises a plurality of independent combustion machine units, two vibration displacement sensors which are vertical to each other are arranged on the measuring section of each combustion machine unit,
arranging a decentralized control device which is internally provided with at least two decentralized controllers, wherein the decentralized controllers are used for sending control commands to a plurality of combustion engine units in the same field bus so as to regulate and control the combustion engine units in the same field bus,
the decentralized controller is provided with a data acquisition module, a processing module and a control module,
the data acquisition module is used for acquiring vibration signals in the horizontal and vertical directions on the measuring section of the gas turbine unit and fusing the acquired vibration signals to acquire multidirectional vibration signals and amplitude, frequency and phase information of the vibration signals in each direction;
the processing module respectively synthesizes multidirectional vibration signals and amplitude, frequency and phase information of the vibration signals in each direction according to each main frequency component, the synthesis results are arranged according to the frequency sequence to form a two-dimensional frequency spectrogram, the offset of rotors in a plurality of gas turbine units in the same field bus is judged according to the two-dimensional frequency spectrogram, the offset is compared with a set threshold value according to the offset, the load values of the plurality of gas turbine units in the same field bus are obtained according to the comparison result, and the control module sends out control instructions to the plurality of gas turbine units in the same field bus through the load values so as to regulate and control working conditions preset at the driving end of the gas turbine units in the same field bus.
7. The combustion engine optimization control method based on the distributed control system according to claim 6, wherein the step of judging the offset of the rotors in the combustion engine units in the same fieldbus according to the two-dimensional spectrogram specifically comprises the steps of:
when a power frequency ellipse in the two-dimensional spectrogram is large and flat, the rotor in the gas turbine unit vibrates irregularly in height and at high frequency, the offset is large and irregular, and the load of the gas turbine unit exceeds the maximum critical state at the moment;
when a power frequency ellipse in the two-dimensional spectrogram is small and round and the power frequency ellipse tends to a round point, the rotor in the gas turbine unit vibrates regularly, the offset is small and regular, and the load of the gas turbine unit gradually tends to be balanced;
when the power frequency ellipse in the two-dimensional spectrogram is small and flat and the power frequency ellipse tends to be large, the rotor vibration in the combustion engine unit changes from low-frequency vibration to high-frequency vibration, the offset is changed from small and approximately regular to large and irregular offset, and the load of the combustion engine unit gradually becomes large at the moment.
8. The distributed control system-based combustion engine optimization control method according to claim 6, wherein the threshold value is rated efficiency data of the combustion engine unit estimated as rated output data of a rotor in the combustion engine unit and as rated offset amount.
9. The combustion engine optimization control method based on the distributed control system according to claim 8, wherein the rated efficiency data is divided into different efficiency levels according to the same regulation and control proportion according to the lower limit value and the upper limit value of the rated efficiency data.
10. The distributed control system-based combustion engine optimization control method according to claim 6, wherein the control module is provided with an optimization control adjusting unit, and the optimization control adjusting unit takes the current load values of the plurality of combustion engine units in the same field bus and the efficiency levels corresponding to the current load values as input, and sends control instructions to the plurality of combustion engine units in the same field bus so as to regulate and control working conditions preset at the driving ends of the combustion engine units in the same field bus.
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