CN114876846B - Full-automatic constant-pressure control system and control method for centrifugal compressor unit - Google Patents
Full-automatic constant-pressure control system and control method for centrifugal compressor unit Download PDFInfo
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- CN114876846B CN114876846B CN202210620784.2A CN202210620784A CN114876846B CN 114876846 B CN114876846 B CN 114876846B CN 202210620784 A CN202210620784 A CN 202210620784A CN 114876846 B CN114876846 B CN 114876846B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/10—Centrifugal pumps for compressing or evacuating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/02—Surge control
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The invention provides a full-automatic constant pressure control system and a full-automatic constant pressure control method for a centrifugal compressor unit, which are used for solving the technical problem that a multivariable adjustment decoupling and full-automatic adjustment scheme cannot be realized in the industry at present. The system comprises a measuring unit, a variable frequency control unit, a throttling adjusting unit, a first-section anti-surge adjusting unit and a second-section anti-surge adjusting unit. The control method of the system comprises the following control modes: a section of anti-surge regulation and pressure regulation decoupling control; the two-stage anti-surge regulation and the pressure regulation are decoupled and controlled; variable frequency regulation control; the first section and the second section are subjected to pressure regulation decoupling control; decoupling two-stage pressure regulation and variable frequency regulation; controlling inlet throttle; the method can realize wide-range multivariable automatic adjustment, and simultaneously, the energy-saving adjustment mode is optimized on the premise of meeting the process requirements of the outlet pressure of the compressor, so that the energy consumption is reduced.
Description
Technical Field
The invention relates to compressor control, in particular to a full-automatic constant pressure control system and a full-automatic constant pressure control method for a centrifugal compressor unit.
Background
The compressor serves mainly for the process industry and is the heart of the process industry. The compressor provides pressurizing service according to a specific technological process, and is widely applied to various industries such as metallurgy, petroleum, chemical industry, natural gas and the like. When the parameters of the process system change, the compressor needs to be correspondingly adjusted, such as flow adjustment, pressure adjustment and the like, so as to meet the requirements of the process system. The common centrifugal compressor adjusting modes include an inlet throttling adjusting mode, a variable rotating speed adjusting mode, an inlet guide vane adjusting mode, a backflow adjusting mode and the like.
At present, the existing constant pressure regulation of the compressor is a mature technology, and generally adopts a single regulation mode such as variable rotation speed, inlet throttling or backflow through manual control, so as to realize the requirement of constant pressure regulation of an outlet when inlet pressure and flow are changed. However, in some fields, such as the fields of peak regulation power plant gas pressure regulating stations, large-scale blower stations, natural gas long-distance pipeline pressurization and the like, a mode that a plurality of compressors are connected in parallel or a plurality of compressors are connected in series is required to be set according to different process parameters, and meanwhile, the working condition of a unit is unstable and needs to be continuously regulated in real time. The existing compressor constant pressure regulating technology is difficult to adapt to the efficient regulation of wide working condition changes (flow and inlet pressure) of a process system, the energy consumption is high and the efficiency is low in unit operation, meanwhile, the manual operation is needed, the labor intensity of the operation is high, and the error rate is high. Currently, aiming at the mode that a plurality of compressors are required to be arranged in parallel or a plurality of compressors are required to be connected in series to work, no scheme capable of realizing multivariable adjustment decoupling and full-automatic adjustment exists in the industry. The main difficulties faced are the following three points:
(1) A problem of efficient load distribution of the multi-stage compressor;
(2) The problems of decoupling of rotation speed and valve adjustment in the constant pressure adjustment process;
(3) Full-automatic intelligent control strategy problem.
Disclosure of Invention
The invention aims to solve the technical problem that a scheme for realizing multivariable adjustment decoupling and full-automatic adjustment is not available in the industry at present, and provides a full-automatic constant-pressure control system and a full-automatic constant-pressure control method for a centrifugal compressor unit.
The full-automatic constant-pressure control system of the centrifugal compressor unit is characterized by comprising a measuring unit, a variable-frequency control unit, a throttling adjusting unit, a first-section anti-surge adjusting unit and a second-section anti-surge adjusting unit;
the measuring unit comprises a first section of inlet pressure remote meter, a first section of flow remote meter, a first section of outlet pressure remote meter, a second section of inlet pressure remote meter, a second section of flow remote meter, a second section of outlet pressure remote meter, a gas turbine load acquisition device and a motor current sensor;
the variable frequency control unit comprises a variable frequency adjustment module and a minimum selection module; the variable frequency regulation target signal SP4, the second-section outlet pressure signal P4 output by the second-section outlet pressure remote transmission meter and the first feed-forward signal FF1 of the fuel engine load output by the fuel engine load acquisition device are respectively sent to the variable frequency regulation module; the output signal and the start signal of the variable frequency adjusting module are respectively sent to the minimum selecting module; the output end of the minimum selection module is connected with a frequency converter;
the throttling adjusting unit comprises a throttling adjusting module; the motor current regulation target signal SP1 and the motor current signal output by the motor current sensor are respectively sent to a throttle regulation module, and the output end of the throttle regulation module is connected with an inlet regulation valve;
the first-stage anti-surge adjusting unit and the second-stage anti-surge adjusting unit are respectively used for PID adjustment of corresponding pressure ratio adjusting target signals and pressure ratio signals, PID adjustment of corresponding outlet pressure adjusting target signals, outlet pressure signals and second feedforward signals FF2, respectively carrying out maximum selection on adjustment results, and sending the selection results to corresponding anti-surge valves.
Further, the first anti-surge adjusting unit comprises a first anti-surge adjusting module, a first pressure adjusting module and a first maximum selecting module;
the first-stage pressure ratio adjusting target signal and the first-stage pressure ratio signal are respectively sent to the first-stage anti-surge adjusting module;
the first section of outlet pressure regulating target signal SP2, the first section of outlet pressure signal P2 output by the first section of outlet pressure remote transmission meter and the second feedforward signal FF2 output by the gas turbine load acquisition device are respectively sent into the first section of pressure regulating module;
the output signal of the first section of anti-surge regulating module and the output signal of the first section of pressure regulating module are respectively sent to the first maximum selecting module; the output end of the first maximum selection module is connected with a section of anti-surge valve.
Further, the one-stage anti-surge adjusting unit further comprises a first rate control module and a first manual operation module MAN1;
the input end of the first speed control module is connected with a section of outlet pressure regulation target signal SP2, and the output signal is sent to a section of pressure regulation module and used for controlling the regulation speed of the section of outlet pressure regulation target signal SP2 when the section of outlet pressure regulation target signal SP2 is regulated;
and the output signal of the first manual operation module MAN1 is sent to the first maximum selection module and is used for manually inputting the signal to the first maximum selection module for intervention under a special working condition.
Further, the two-stage anti-surge adjusting unit comprises a two-stage anti-surge adjusting module, a two-stage pressure adjusting module, a second maximum selecting module and a pressurizing module;
the input end of the pressurizing module is connected with a variable-frequency regulation target signal SP4, and the output signal is sent to a two-stage pressure regulation module and is used for pressurizing the variable-frequency regulation target signal SP4 to serve as a two-stage pressure regulation given value SP4'; the pressurizing range of the pressurizing module is 0.01MPa-0.1MPa;
the second-stage pressure ratio adjusting target signal and the second-stage pressure ratio signal are respectively sent to a second-stage anti-surge adjusting module;
the second section pressure regulation set point SP4', the second section outlet pressure signal P4 output by the second section outlet pressure remote transmission meter and the second feedforward signal FF2 output by the gas turbine load acquisition device are respectively sent into the second section pressure regulation module;
the output signal of the second-stage anti-surge adjusting module and the output signal of the second-stage pressure adjusting module are respectively sent to a second maximum selecting module; the output end of the second maximum selection module is connected with the two-section anti-surge valve.
Further, the two-stage anti-surge adjusting unit further comprises a second manual operation module MAN2;
and the output signal of the second manual operation module MAN2 is sent to a second maximum selection module and is used for manually inputting the signal to the second maximum selection module for intervention under a special working condition.
Further, the first section of anti-surge adjusting unit further comprises a second rate control module, the input end of the second rate control module is connected with the output signal of the first maximum selecting module, the output end of the second rate control module is connected with the first section of anti-surge valve, and the second rate control module is used for controlling the opening of the first section of anti-surge valve after the speed adjustment of the opening instruction adjusting quantity of the first section of valve is carried out;
the second-section anti-surge adjusting unit further comprises a third speed control module, the input end of the third speed control module is connected with the output signal of the second maximum selecting module, the output end of the third speed control module is connected with the second-section anti-surge valve, and the second-section anti-surge valve is used for controlling the opening of the second-section anti-surge valve after speed adjustment is carried out on the opening instruction adjustment quantity of the second-section valve.
Further, the variable frequency control unit further comprises a third manual operation module MAN3, which is used for manually inputting signals to the minimum selection module for intervention under special working conditions.
The invention also provides a control method of the full-automatic efficient constant-pressure control system of the centrifugal compressor unit, which is characterized by comprising the following control modes:
1) One-stage anti-surge regulation and pressure regulation decoupling control
1.1 Surge-proof regulation of a compressor
PID operation is carried out on the first-stage pressure ratio adjusting target signal and the first-stage pressure ratio signal, and a first-stage anti-surge adjusting instruction is obtained;
1.2 Compressor outlet pressure regulation
PID operation is carried out on the section of outlet pressure regulating target signal SP2, the section of outlet pressure signal P2 and the second feedforward signal FF2, so that a section of outlet pressure regulating instruction is obtained;
1.3 A section of anti-surge regulation and pressure regulation decoupling control
Selecting a larger opening instruction of the anti-surge regulation instruction and the outlet pressure regulation instruction as a final instruction output, and controlling the opening of the anti-surge valve;
2) Two-stage anti-surge regulation and pressure regulation decoupling control
2.1 Surge-proof regulation of two-stage compressor
PID operation is carried out on the two-section pressure ratio adjusting target signal and the two-section pressure ratio signal, so that a two-section anti-surge adjusting instruction is obtained;
2.2 Second stage compressor outlet pressure regulation
PID operation is carried out on the variable-frequency regulation target signal SP4, the second-section outlet pressure signal P4 and the second feedforward signal FF2, so that a second-section outlet pressure regulation instruction is obtained;
2.3 Second-stage anti-surge regulation and pressure regulation decoupling control
Selecting a command with larger opening degree from the two-section anti-surge regulating command and the two-section outlet pressure regulating command as a final command to be output, and controlling the opening degree of the two-section anti-surge valve;
3) Variable frequency adjustment control
PID operation is carried out on the variable frequency regulation target signal SP4, the second-section outlet pressure signal P4 and the first feedforward signal FF1 of the load of the combustion engine to obtain a variable frequency regulation instruction, when the second-section outlet pressure signal P4 is smaller than the variable frequency regulation target signal SP4, the frequency converter frequency is increased to increase the rotating speed of the unit, otherwise, the frequency converter frequency is decreased to reduce the rotating speed of the unit;
4) First-stage and second-stage pressure regulation decoupling control
When the pressure PID regulation parameters are set, PID regulation is carried out on the second-section outlet pressure P4 by adopting the same regulation rate, and then PID regulation is carried out on the first-section outlet pressure P2;
or adopting a mode of adjusting the first section and the second section simultaneously, performing PID adjustment on the first section outlet pressure P2 at a low rate, and performing PID adjustment on the second section outlet pressure P4 at a high rate;
5) Two-stage pressure regulation and variable frequency regulation decoupling
Pressurizing the variable-frequency regulation target signal SP4, and taking the pressurized variable-frequency regulation target signal SP4 as a second-stage pressure regulation given value SP4'; the second-stage pressure regulating command controls the second-stage anti-surge valve to reduce the opening degree until the second-stage outlet pressure P4 reaches the target value of the variable-frequency regulating target signal SP4 when reaching an anti-surge regulating line;
6) Inlet throttle control
And (3) performing throttling PID (proportion integration differentiation) adjustment on the motor current adjustment target signal SP1 and the motor rated current signal, and controlling the opening of the inlet throttle valve.
Further, in the control mode 5), the step of boosting the variable frequency adjustment target signal SP4 specifically includes: the pressure of 0.05MPa is increased for the variable frequency adjustment target signal SP 4.
The invention has the beneficial effects that:
1. according to the full-automatic constant-pressure control system of the centrifugal compressor unit, the frequency conversion control unit is provided with the minimum selection module, the first-stage anti-surge adjusting unit and the second-stage anti-surge adjusting unit are respectively provided with the maximum selection module, so that wide-range multivariable automatic adjustment can be realized, meanwhile, the energy-saving adjusting mode is optimized on the premise of meeting the process requirements of the outlet pressure of the compressor, and the energy consumption is reduced.
2. According to the full-automatic constant-pressure control system of the centrifugal compressor unit, provided by the invention, the first feedforward signal FF1 of the load of the combustion engine is input to the variable-frequency adjusting module for feedforward adjustment, so that the requirement that the adjusting system cannot follow a subsequent process system in the starting and stopping stages is avoided, the quick response capability to the variable load of the combustion engine is improved, and the constant-pressure control is faster and more stable along with the process change; the first-stage and second-stage anti-surge adjusting modules are input with the second feed-forward signal FF2 of the fuel engine load for feed-forward adjustment, and the first-stage anti-surge valve and the second-stage anti-surge valve can be adjusted in real time, so that the system is suitable for the influence of the rapid load rise and fall of the fuel engine and the pressure fluctuation of a pipe network on the system, the response rate of the system control is further improved, and the adjustment requirement of the rapid load rise and fall of the fuel engine is met.
3. According to the full-automatic constant-pressure control system of the centrifugal compressor unit, the first speed control module arranged on the anti-surge adjusting unit is used for finely controlling the time-varying speed of the outlet pressure adjusting target signal SP2, so that the influence on the stability of the control system when the change span is large is prevented.
4. According to the full-automatic constant-pressure control system of the centrifugal compressor unit, the two-stage anti-surge adjusting unit is provided with the pressurizing module, and after the two-stage pressurizing module pressurizes the variable-frequency adjusting target signal SP4, both variable-frequency adjusting and pressure adjusting can be enabled to work, and high-efficiency operation is achieved while system safety is guaranteed.
5. The full-automatic constant-pressure control system of the centrifugal compressor unit provided by the invention can respectively send output signals of the first maximum selection module of the first-stage anti-surge adjusting unit and the second maximum selection module of the second-stage anti-surge adjusting unit into the second rate control module and the third rate control module, so that after rate control is carried out on the opening instruction variable quantity of each stage of valve, the opening control is carried out on each stage of anti-surge valve, and the risk of overshoot (overshoot) is avoided when the anti-surge valve is adjusted while the quick adjustment index is responded.
6. According to the full-automatic constant-pressure control system of the centrifugal compressor unit, the variable-frequency control unit, the first-stage anti-surge adjusting unit and the second-stage anti-surge adjusting unit are respectively provided with the third manual operation module MAN3, the second manual operation module MAN2 and the first manual operation module MAN1, and are used for manually inputting signals to the minimum selection module, the first maximum selection module and the second maximum selection module for intervention under special working conditions, so that the manual intervention convenience of the system is improved, and the safety is improved.
7. According to the full-automatic constant-pressure control method for the centrifugal compressor unit, the larger opening degree command in the first-stage/second-stage anti-surge regulation command and the first-stage/second-stage outlet pressure regulation command is selected as the final command output, so that the opening degree of the first-stage/second-stage anti-surge valve is controlled, the decoupling control of anti-surge regulation and pressure regulation is realized, the influence of the anti-surge regulation and the outlet pressure regulation on the opening degree of the anti-surge valve is avoided, and the operation safety of the unit is ensured while the outlet pressure is controlled.
8. According to the full-automatic constant-pressure control method for the centrifugal compressor unit, when pressure PID regulation parameters are set, the same regulation rate is used for PID regulation of the two-section outlet pressure P4, and then PID regulation is carried out on the one-section outlet pressure P2; or adopting a mode of simultaneously adjusting the first section and the second section, adopting a low-speed PID (proportion integration differentiation) adjustment to the first section outlet pressure P2, adopting a mode of high-speed PID adjustment to the second section outlet pressure P4, realizing decoupling control of the first section and the second section pressure adjustment, avoiding the influence of the first section outlet pressure P2 on the second section inlet pressure P3, meeting the requirement of quick adjustment response and avoiding oscillation.
9. The invention provides a full-automatic constant-pressure control method of a centrifugal compressor unit, which is used for pressurizing a variable-frequency regulation target signal SP4, and taking the pressurized value as a two-section pressure regulation given value SP4'; the second-section pressure regulation command controls the second-section anti-surge valve to reduce the opening degree until reaching an anti-surge regulation line, the second-section outlet pressure P4 reaches the target value of the variable frequency regulation target signal SP4, the decoupling of the second-section pressure regulation and the variable frequency regulation is realized, the influence caused by the fact that the variable frequency control variable is identical to the second-section pressure regulation control variable is avoided, the variable frequency regulation and the pressure regulation both play roles, the control efficiency of the system is improved, and the safety of the system is also ensured.
10. The full-automatic constant-pressure control method for the centrifugal compressor unit provided by the invention realizes wide-range variation of air inlet pressure and air inlet flow and multivariable automatic adjustment, and reduces energy consumption on the premise of meeting the process requirements of outlet pressure of the compressor.
11. The full-automatic constant-pressure control method for the centrifugal compressor unit provided by the invention realizes an unattended mode of full-automatic load control of the compressor unit.
Drawings
FIG. 1 is a schematic diagram of a system for controlling a full-automatic constant pressure of a centrifugal compressor unit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a frequency conversion control unit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a throttle adjusting unit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a control structure for decoupling anti-surge and pressure regulation according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a two-stage anti-surge and pressure regulation decoupling control structure in an embodiment of the present invention;
FIG. 6 is a schematic diagram of a decoupling structure for two-stage pressure regulation and variable frequency regulation according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of feedforward control in an embodiment of the method of the present invention.
Specific reference numerals are as follows:
11-one-section inlet pressure remote meter, 12-one-section flow remote meter, 13-one-section outlet pressure remote meter, 14-two-section inlet pressure remote meter, 15-two-section flow remote meter and 16-two-section outlet pressure remote meter;
21-a variable frequency adjustment module, 22-a minimum selection module;
31-a throttle adjustment module;
41-a section of anti-surge regulating module, 42-a section of pressure regulating module; 43-a first maximum selection module, 44-a first rate control module, 45-a second rate control module;
51-two-stage anti-surge regulation module, 52-two-stage pressure regulation module, 53-second maximum selection module, 54-pressurization module, 55-third speed control module.
Detailed Description
To further clarify the advantages and features of the present invention, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
The background of the application of the embodiment is a booster compressor unit of a gas pressure regulating station, and a scheme of serial compression of two sections of centrifugal compressors is needed due to the large pressure of process requirements. The compressor unit process flow equipment comprises a first section of compressor, a second section of compressor, a variable frequency motor, an inlet regulating valve, a first section of anti-surge regulating valve and a second section of anti-surge regulating valve. In the working process of the compressor, the flow changes in real time, and finally the outlet pressure (second-stage outlet pressure) of the compressor unit is required to realize constant pressure regulation, and meanwhile, the lowest power consumption is realized. That is, the inlet pressure variation and the flow variation within the design parameter range can realize the stable control of the outlet pressure (the second-stage outlet pressure P4) of the compressor unit. In the embodiment, the inlet pressure fluctuation range of the compressor is 3-12 bar, the flow regulation range is 0-100%, and the outlet pressure requirement is 2.5MPa plus or minus 0.2MPa.
As shown in FIG. 1, the full-automatic constant pressure control system of the centrifugal compressor unit comprises a measuring unit, a variable frequency control unit, a throttling adjusting unit, a first-section anti-surge adjusting unit and a second-section anti-surge adjusting unit. The measuring unit comprises a section of inlet pressure remote meter 11, a section of flow remote meter 12, a section of outlet pressure remote meter 13, a section of inlet pressure remote meter 14, a section of flow remote meter 15, a section of outlet pressure remote meter 16, a gas turbine load acquisition device and a motor current sensor.
As shown in fig. 2, the variable frequency control unit is an independent PID regulation, which comprises a variable frequency regulation module 21, a minimum selection module 22 and a third manual operation module MAN3. The third manual operation module MAN3 is configured to manually input a signal to the minimum selection module 22 for intervention under a specific operating condition. The variable frequency regulation target signal SP4, the second-section outlet pressure signal P4 output by the second-section outlet pressure remote transmission meter 16 and the first feed-forward signal FF1 of the fuel engine load output by the fuel engine load acquisition device are respectively sent to the variable frequency regulation module 21; after the output signals of the frequency conversion adjusting module 21, the start signal and the output signal of the third manual operation module MAN3 are respectively sent to the minimum selecting module 22 to be selected by minimum instructions, the output end of the minimum selecting module 22 is connected with a frequency converter, and the frequency converter is used for adjusting the frequency of the frequency converter.
As shown in fig. 3, the throttle adjusting unit includes a throttle adjusting module 31, and a motor current adjusting target signal SP1 and a motor current signal output by a motor current sensor are respectively sent to the throttle adjusting module 31, and an output end of the throttle adjusting module 31 is connected with an inlet adjusting valve for adjusting the inlet adjusting valve.
As shown in fig. 4, the anti-surge adjusting unit includes an anti-surge adjusting module 41, a pressure adjusting module 42, a first maximum selecting module 43, a first rate control module 44, a second rate control module 45, and a first manual operation module MAN1. The first-stage anti-surge adjusting module 41 and the first-stage pressure adjusting module 42 are two mutually independent incremental PID adjusting modules, and are respectively used for realizing anti-surge adjustment of the first-stage compressor and constant output of the first-stage outlet pressure P2 (second-stage inlet pressure P3) through adjustment of the first-stage anti-surge valve; the first maximum selection module 43 is used for selecting the adjusting instructions output by the anti-surge adjusting module 41 and the pressure adjusting module 42; the input end of the first speed control module 44 is connected to a section of outlet pressure adjustment target signal SP2, and is used for controlling the adjustment speed of the section of outlet pressure adjustment target signal SP2 to obtain a stable section of outlet pressure adjustment target signal SP2', and the output signal of the first speed control module is sent to the section of pressure adjustment module 42; the input end of the second rate control module 45 is connected with the output signal of the first maximum selection module 43, and the output signal of the second rate control module 45 is connected with a section of anti-surge valve and is used for controlling the opening of the section of anti-surge valve after the rate control is carried out on the opening instruction adjustment quantity of the section of valve; the first manual operation module MAN1 is configured to manually input a signal to the first maximum selection module 43 for intervention under a specific operating condition. And a surge-preventing adjusting section, a pressure ratio adjusting target signal and a pressure ratio signal are respectively sent to the surge-preventing adjusting module 41, wherein the pressure ratio adjusting target signal is determined by an surge-preventing adjusting line, the pressure ratio signal is the ratio of the outlet pressure P2 to the inlet pressure P1 under different flow rates F1, and the pressure ratio is the actual pressure ratio. In the first stage of outlet pressure regulating part, the output signal of the first rate control module 44 is sent to the first stage of anti-surge regulating module 41, and when the first stage of outlet pressure regulating target signal SP2 (target value calculated by a user) needs to be regulated, the regulating rate of the first stage of outlet pressure regulating target signal SP2 is controlled by the first rate control module 44, so that a stable first stage of outlet pressure regulating target signal SP2' is obtained; the stabilized one-stage outlet pressure adjustment target signal SP2', the one-stage outlet pressure signal P2 output by the one-stage outlet pressure remote sensing meter 13, and the second feedforward signal FF2 output by the gas turbine load acquisition device are respectively fed into the one-stage pressure adjustment module 42. The output signal of the first-stage anti-surge regulating module 41, the output signal of the first-stage pressure regulating module 42 and the output signal of the first manual operation module MAN1 are respectively sent to the first maximum selecting module 43, the output signal of the first maximum selecting module 43 is sent to the second-speed control module 45, and the output end of the second-speed control module 45 is connected with the first-stage anti-surge valve and used for controlling the opening of the second-stage anti-surge valve after the opening instruction variable quantity of the second-stage valve is controlled at a speed.
As shown in fig. 5 and 6, the two-stage anti-surge adjusting unit includes a two-stage anti-surge adjusting module 51, a two-stage pressure adjusting module 52, a second maximum selecting module 53, a supercharging module 54, a third speed control module 55, and a second manual operation module MAN2. The two-section anti-surge adjusting module 51 and the two-section pressure adjusting module 52 are two mutually independent incremental PID adjusting modules, and the anti-surge adjustment of the two-section compressor and the constant output of the two-section outlet pressure P4 (the outlet pressure of the compressor unit) are respectively realized through the adjustment of the two-section anti-surge valve; the second maximum selection module 53 is used for selecting the adjusting instructions output by the two-stage anti-surge adjusting module 51 and the two-stage pressure adjusting module 52; the input end of the pressurizing module 54 is connected with a variable frequency adjusting target signal SP4, the output signal is sent to the two-stage pressure adjusting module 52 and is used for pressurizing the variable frequency adjusting target signal SP4 input into the two-stage pressure adjusting module 52 and then inputting the variable frequency adjusting target signal SP4' as a two-stage outlet pressure adjusting target signal SP4', the two-stage outlet pressure adjusting target signal SP4' is higher than the variable frequency adjusting target signal SP4, the pressurizing range of the pressurizing module 54 is 0.01MPa-0.1MPa, and in the embodiment, 0.05MPa is selected; the input end of the third speed control module 55 is connected with the output signal of the second maximum selection module 53, and the output end of the third speed control module 55 is connected with a two-section anti-surge valve and is used for controlling the opening of the two-section anti-surge valve after the speed control of the opening instruction adjustment quantity of the two-section valve is carried out; the second manual operation module MAN2 is configured to manually input a signal to the second maximum selection module 53 for intervention under a specific working condition. And the first-stage anti-surge adjusting part sends a second-stage pressure ratio adjusting target signal and a second-stage pressure ratio signal to the second-stage anti-surge adjusting module 51 respectively, wherein the second-stage pressure ratio signal is the ratio of the second-stage outlet pressure P4 to the second-stage inlet pressure P3 under different second-stage flow rates F2. The second-stage pressure adjusting part, the second-stage outlet pressure adjusting target signal SP4', the second-stage outlet pressure signal P4 output by the second-stage outlet pressure remote transmitting meter 16, and the second feedforward signal FF2 output by the gas turbine load collecting device are respectively sent to the second-stage pressure adjusting module 52. The output signal of the second-stage anti-surge regulating module 51, the output signal of the second-stage pressure regulating module 52 and the output signal of the second manual operation module MAN2 are respectively sent to the second maximum selecting module 53, the output signal of the second maximum selecting module 53 is sent to the third speed control module 55, and the output end of the third speed control module 55 is connected with a stage of anti-surge valve to control the opening degree of the second-stage anti-surge valve. The second rate control module 45 and the third rate control module 55 perform control by adopting a control target variable trend advanced pre-judging and adjusting algorithm, wherein the algorithm is similar to a driving brake, and the braking is stepped more rapidly as the vehicle distance is smaller and the relative vehicle speed is faster. And in the same way, by detecting the change rate and direction of the flow and the difference value between the current flow and the regulating line flow, whether the line collision risk exists after a plurality of seconds is judged in advance, so that the opening of the anti-surge valve is changed until the opening is zero. That is, the rate at which the anti-surge valve is allowed to close is positively correlated with the current operating point margin from the anti-surge line, while negatively correlated with the rate of flow change and direction. The greater the margin of the anti-surge line, the faster the rate at which the anti-surge valve is allowed to close, the slower the rate closer to the anti-surge line, the faster the flow rate becomes less trend, and the slower the rate.
The invention discloses a full-automatic constant pressure control method of a centrifugal compressor unit, which specifically comprises the following control modes:
1) One-stage anti-surge regulation and pressure regulation decoupling control
1.1 Surge-proof regulation of a compressor
The anti-surge regulation is to control the opening degree of the anti-surge valve to realize the anti-surge effect of the compressor, when the anti-surge valve is opened, the flow is increased, the pressure ratio is reduced, the operation condition of the compressor is safer, but the energy consumption is increased; when the anti-surge valve is closed, the flow is reduced, the pressure ratio is increased, the operation condition of the compressor is more close to the surge point, and the energy consumption is reduced. Therefore, the anti-surge regulation is needed to ensure that the compressor can safely run under any working condition and can save energy relatively.
And performing PID operation on the first-stage pressure ratio adjusting target signal and the first-stage pressure ratio signal to obtain a first-stage anti-surge adjusting instruction. When the pressure ratio signal, namely the actual pressure ratio, is larger than the pressure ratio regulating target signal, the opening of the anti-surge valve is increased, otherwise, the opening of the anti-surge valve is reduced, so that the working point of the compressor runs near the anti-surge regulating line.
1.2 Compressor outlet pressure regulation
The outlet pressure regulation is to realize the stable output of the outlet pressure of the compressor by controlling the opening degree of the anti-surge valve.
The stable one-stage outlet pressure regulation target signal SP2', the one-stage outlet pressure signal P2 and the second feedforward signal FF2 are subjected to PID operation to obtain one-stage outlet pressure regulation command. When the first-stage outlet pressure P2 is lower than the first-stage outlet pressure adjustment target signal SP2, the opening degree of the first-stage anti-surge valve is gradually reduced until the first-stage outlet pressure P2 reaches the first-stage outlet pressure adjustment target signal SP2. In this embodiment, the outlet pressure adjustment target signal SP2 is initially set to 1.58Mpa (A).
1.3 A section of anti-surge regulation and pressure regulation decoupling control
Because the anti-surge regulation and the outlet pressure regulation of the first-stage compressor are realized by controlling the opening degree of the first-stage anti-surge valve, decoupling control is needed.
The adjusting command of the anti-surge adjusting module 41 and the adjusting command of the pressure adjusting module 42 simultaneously control the opening degree of the anti-surge valve, the command with larger opening degree in the two commands is selected as the final command output through the first maximum selecting module 43, the opening degree of the anti-surge valve is controlled, and the operation safety of the unit is ensured while the outlet pressure is controlled.
2) Two-stage anti-surge regulation and pressure regulation decoupling control
The two-stage anti-surge regulation, pressure regulation and decoupling control are similar or identical to those of the first stage, and therefore this section will be briefly described.
2.1 Surge-proof regulation of two-stage compressor
And performing PID operation on the two-section pressure ratio adjusting target signal and the two-section pressure ratio signal to obtain a two-section anti-surge adjusting instruction.
2.2 Second stage compressor outlet pressure regulation
And performing PID operation on the variable frequency regulation target signal SP4, the two-stage outlet pressure signal P4 and the second feedforward signal FF2 to obtain a two-stage outlet pressure regulation instruction.
2.3 Second-stage anti-surge regulation and pressure regulation decoupling control
And selecting a command with larger opening in the two-section anti-surge regulating command and the two-section outlet pressure regulating command as a final command to output, and controlling the opening of the two-section anti-surge valve.
3) Variable frequency adjustment control
The variable frequency regulation control is independent PID regulation, PID operation is carried out on a variable frequency regulation target signal SP4, a two-section outlet pressure signal P4 and a first feed-forward signal FF1 of the load of the combustion engine to obtain a variable frequency regulation instruction, when the two-section outlet pressure P4 is smaller than the variable frequency regulation target signal SP4, the frequency of the frequency converter is increased to promote the rotating speed of the unit, otherwise, the frequency of the frequency converter is reduced to reduce the rotating speed of the unit.
4) First-stage and second-stage pressure regulation decoupling control
Since the primary outlet pressure P2 and the secondary outlet pressure P4 are in a coupled relationship on the process system, the primary outlet pressure P2 directly affects the secondary inlet pressure P3. The primary pressure regulation and the secondary pressure regulation adopt two independent regulators, namely a primary pressure regulation module 42 and a secondary pressure regulation module 52, and the two-stage pressure PID regulation parameters are regulated and timed, so that the regulation response is satisfied as fast as possible, and meanwhile, the oscillation is avoided.
The specific scheme is as follows: when the pressure PID regulation parameters are set, PID regulation is carried out on the second-section outlet pressure P4 by adopting the same regulation rate, and then PID regulation is carried out on the first-section outlet pressure P2; or the first-stage outlet pressure P2 is subjected to PID regulation at a low speed by adopting a mode of simultaneously regulating the first-stage pressure and the second-stage outlet pressure P4 is subjected to PID regulation at a high speed, so that decoupling control of the first-stage pressure regulation and the second-stage pressure regulation is realized, and the influence of the first-stage outlet pressure P2 on the second-stage inlet pressure P3 is avoided.
5) Two-stage pressure regulation and variable frequency regulation decoupling
The change in the rotational speed of the inverter affects the change in the pressure ratio of the compressor. The variable frequency regulation target signal SP4 is two-stage outlet pressure, so that the first-stage outlet pressure regulation target signal SP2 is inconsistent with the variable frequency regulation target signal SP4, and the signals are independent and do not interfere; the variable frequency adjustment target signal SP4 and the two-stage outlet pressure adjustment target signal SP4' are both target adjustment values of the two-stage outlet pressure P4, and thus require decoupling.
The efficiency of the variable frequency regulation unit is higher than that of the reflux regulation, so that the variable frequency regulation is a priority principle. The scheme of the invention adopts a constant difference given algorithm, and the pressure of 0.05Mpa is increased to the variable frequency adjustment target signal SP4 through the two-stage supercharging module 56. When the variable frequency regulation and the two-stage pressure regulation jointly act to control the two-stage outlet pressure P4 to boost and reach the variable frequency regulation target signal SP4, the two-stage pressure regulation continuously increases the two-stage outlet pressure P4 by reducing the opening of the valve, so that the two-stage outlet pressure P4 is regulated to the two-stage outlet pressure regulation target signal SP4'; the variable frequency regulation control reduces the two-stage outlet pressure P4 so as to regulate the variable frequency regulation target signal SP 4. The second-stage outlet pressure regulating target signal SP4 'is always larger than the variable frequency regulating target signal SP4, so that the second-stage outlet pressure P4 can fluctuate between SP4 and SP4', the rotating speed of a unit controlled by the variable frequency regulating in the process is gradually reduced, the opening degree of the second-stage anti-surge valve is gradually reduced until the anti-surge regulating line is reached by the second-stage pressure regulating, at the moment, the second-stage pressure regulating is not acted any more, and the variable frequency regulating controls the second-stage outlet pressure P4 to reach the target value of the variable frequency regulating target signal SP 4. Therefore, the variable frequency regulation and the pressure regulation play roles, namely, the high-efficiency operation of the system is realized, and the safety of the system is also ensured.
6) Inlet throttle control
The initial states of the inlet throttle valves are all open states, and the set current load value is higher than the general load, so that the problems that the load of a motor is high or exceeds the rated value under the condition of large backflow of a compressor unit with a large parameter range and a low-load running of the unit fuel engine can be solved.
And (3) performing throttling PID (proportion integration differentiation) adjustment on the motor current adjustment target signal SP1 and the motor rated current signal, and controlling the opening of the inlet throttle valve.
7) Feedforward control
The feedforward control is divided into two parts, on one hand, the load change of the combustion engine, especially the start-up and stop stages are very fast, and the working flow change range of the compressor is large. In order to avoid that the adjusting system cannot meet the requirements of a subsequent process system, a first feed-forward signal FF1 of the load of the combustion engine, which is converted in a range forward direction, is input into the variable frequency adjusting module for feed-forward adjustment, so that the quick response capability to the variable load of the combustion engine is improved, and the constant voltage control is faster and more stable along with the process change.
On the other hand, since the compressor outlet is still a distance from the core plant gas engine, compressor outlet pressure stabilization is actually to stabilize the gas inlet pressure. When the pressure of the combustion engine changes, a delay is reflected to the compressor outlet, which affects the accurate implementation of control. The feedforward of this part can only feed back the load signal of the combustion engine, or can feed forward after adding the feedback load signal of the combustion engine and the pressure difference signal of the pipe network (the pressure difference before the inlet of the combustion engine and the pressure of the first or second section). The load of the gas engine and the pressure difference signal of the pipe network which are converted in the reverse direction of the measuring range are added through the adder and then are respectively input into the first section of pressure regulating module 42 and the second section of pressure regulating module 52 as the second feedforward signal FF2, and the first section of anti-surge valve and the second section of anti-surge valve are regulated in real time, so that the system is suitable for the influence of the rapid load rising and reducing of the gas engine and the pressure fluctuation of the pipe network on the system. As shown in fig. 7, a schematic diagram of the second feedforward signal FF2 being input to the stage pressure regulating module 42 to regulate the stage anti-surge valve. The advantage of this is that the surge protection valve can be moved faster in advance while the load or pipe network pressure fluctuates, without the need for readjustment after a change in the pressure. That is to say, the passive regulation is changed into the active regulation, so as to achieve the purpose of pre-movement. The feedforward regulation is integrated with the pressure regulation, and the main control object is a compressor anti-surge regulating valve, so that the response rate of system control is further improved, and the regulation requirement of the rapid load rise and fall of the combustion engine is met.
The system and the method are also suitable for full-automatic control of three or more compressor units.
The foregoing description is only for the purpose of illustrating the technical solution of the present invention, but not for the purpose of limiting the same, and it will be apparent to those of ordinary skill in the art that modifications may be made to the specific technical solution described in the foregoing embodiments, or equivalents may be substituted for parts of the technical features thereof, without departing from the spirit of the technical solution of the present invention.
Claims (9)
1. A full-automatic constant pressure control system of centrifugal compressor unit, its characterized in that: the device comprises a measuring unit, a variable frequency control unit, a throttling adjusting unit, a first-section anti-surge adjusting unit and a second-section anti-surge adjusting unit;
the measuring unit comprises a first-section inlet pressure remote meter (11), a first-section flow remote meter (12), a first-section outlet pressure remote meter (13), a second-section inlet pressure remote meter (14), a second-section flow remote meter (15), a second-section outlet pressure remote meter (16), a gas turbine load acquisition device and a motor current sensor;
the variable frequency control unit comprises a variable frequency adjustment module (21) and a minimum selection module (22); the minimum selection module (22) is used for carrying out minimum instruction selection; the variable frequency regulation target signal SP4, a second-section outlet pressure signal P4 output by a second-section outlet pressure remote transmission meter (16) and a first feed-forward signal FF1 of the fuel engine load output by a fuel engine load acquisition device are respectively sent to a variable frequency regulation module (21); the output signal and the start signal of the variable frequency adjusting module (21) are respectively sent to the minimum selecting module (22); the output end of the minimum selection module (22) is connected with a frequency converter;
the throttle adjustment unit comprises a throttle adjustment module (31); the motor current regulation target signal SP1 and the motor current signal output by the motor current sensor are respectively transmitted to a throttle regulation module (31), and the output end of the throttle regulation module (31) is connected with an inlet regulation valve;
the first-stage anti-surge adjusting unit and the second-stage anti-surge adjusting unit are respectively used for PID adjustment of corresponding pressure ratio adjusting target signals and pressure ratio signals, PID adjustment of corresponding outlet pressure adjusting target signals, outlet pressure signals and second feedforward signals FF2, respectively carrying out maximum selection on adjustment results, and sending the selection results to corresponding anti-surge valves.
2. The full-automatic constant pressure control system of a centrifugal compressor unit according to claim 1, wherein:
the anti-surge adjusting unit comprises an anti-surge adjusting module (41), a pressure adjusting module (42) and a first maximum selecting module (43); the first maximum selection module (43) is used for selecting an instruction with larger opening degree of the two instructions as a final instruction to be output;
the first-stage pressure ratio adjusting target signal and the first-stage pressure ratio signal are respectively sent to a first-stage anti-surge adjusting module (41);
the first section of outlet pressure regulating target signal SP2, the first section of outlet pressure signal P2 output by the first section of outlet pressure remote transmitting meter (13) and the second feedforward signal FF2 output by the gas turbine load acquisition device are respectively sent into the first section of pressure regulating module (42);
an output signal of the anti-surge adjusting module (41) and an output signal of the pressure adjusting module (42) are respectively sent to the first maximum selecting module (43); the output end of the first maximum selection module (43) is connected with a section of anti-surge valve.
3. The full-automatic constant pressure control system of a centrifugal compressor unit according to claim 2, wherein:
the segment of anti-surge regulation unit further comprises a first rate control module (44) and a first manual operation module MAN1;
the input end of the first speed control module (44) is connected with a section of outlet pressure regulation target signal SP2, and the output signal is sent to a section of pressure regulation module (42) for controlling the regulation speed of the section of outlet pressure regulation target signal SP2 when the regulation is carried out on the section of outlet pressure regulation target signal SP 2;
the output signal of the first manual operation module MAN1 is sent to the first maximum selection module (43) and is used for manually inputting the signal to the first maximum selection module (43) for intervention under special working conditions.
4. A centrifugal compressor assembly full-automatic constant pressure control system according to any one of claims 1-3, wherein:
the second-stage anti-surge adjusting unit comprises a second-stage anti-surge adjusting module (51), a second-stage pressure adjusting module (52), a second maximum selecting module (53) and a pressurizing module (54); the second maximum selection module (53) is used for selecting an instruction with larger opening degree of the two instructions as a final instruction to be output;
the input end of the pressurizing module (54) is connected with a variable-frequency regulation target signal SP4, and the output signal is sent to a two-stage pressure regulation module (52) for pressurizing the variable-frequency regulation target signal SP4 and then serving as a two-stage pressure regulation given value SP4'; the pressurizing range of the pressurizing module (54) is 0.01MPa-0.1MPa;
the two-stage pressure ratio adjusting target signal and the two-stage pressure ratio signal are respectively sent to a two-stage anti-surge adjusting module (51);
the second section pressure regulation set value SP4', the second section outlet pressure signal P4 output by the second section outlet pressure remote transmission meter (16) and the second feedforward signal FF2 output by the gas turbine load acquisition device are respectively sent into the second section pressure regulation module (52);
the output signal of the two-stage anti-surge adjusting module (51) and the output signal of the two-stage pressure adjusting module (52) are respectively sent to a second maximum selecting module (53); the output end of the second maximum selection module (53) is connected with a two-section anti-surge valve.
5. The full-automatic constant pressure control system of a centrifugal compressor unit according to claim 4, wherein:
the two-stage anti-surge adjusting unit further comprises a second manual operation module MAN2;
and the output signal of the second manual operation module MAN2 is sent to a second maximum selection module (53) and is used for manually inputting a signal to the second maximum selection module (53) for intervention under a special working condition.
6. The full-automatic constant pressure control system of a centrifugal compressor unit according to claim 5, wherein:
the first section of anti-surge regulating unit further comprises a second rate control module (45), the input end of the second rate control module (45) is connected with the output signal of the first maximum selection module (43), the output end of the second rate control module (45) is connected with the first section of anti-surge valve, and the second rate control module is used for controlling the opening of the first section of anti-surge valve after the speed regulation of the opening command regulating quantity of the first section of valve is carried out;
the second-section anti-surge adjusting unit further comprises a third speed control module (55), the input end of the third speed control module (55) is connected with the output signal of the second maximum selecting module (53), and the output end of the third speed control module (55) is connected with the second-section anti-surge valve and used for controlling the opening of the second-section anti-surge valve after speed adjustment is carried out on the opening instruction adjusting quantity of the second-section valve.
7. The full-automatic constant pressure control system of a centrifugal compressor unit according to claim 6, wherein:
the frequency conversion control unit also comprises a third manual operation module MAN3 which is used for manually inputting signals into the minimum selection module (22) for intervention under special working conditions.
8. A control method of a full-automatic constant pressure control system of a centrifugal compressor unit according to any one of claims 1 to 7, characterized by comprising the following control modes:
1) One-stage anti-surge regulation and pressure regulation decoupling control
1.1 Surge-proof regulation of a compressor
PID operation is carried out on the first-stage pressure ratio adjusting target signal and the first-stage pressure ratio signal, and a first-stage anti-surge adjusting instruction is obtained;
1.2 Compressor outlet pressure regulation
PID operation is carried out on the section of outlet pressure regulating target signal SP2, the section of outlet pressure signal P2 and the second feedforward signal FF2, so that a section of outlet pressure regulating instruction is obtained;
1.3 A section of anti-surge regulation and pressure regulation decoupling control
Selecting a larger opening instruction of the anti-surge regulation instruction and the outlet pressure regulation instruction as a final instruction output, and controlling the opening of the anti-surge valve;
2) Two-stage anti-surge regulation and pressure regulation decoupling control
2.1 Surge-proof regulation of two-stage compressor
PID operation is carried out on the two-section pressure ratio adjusting target signal and the two-section pressure ratio signal, so that a two-section anti-surge adjusting instruction is obtained;
2.2 Second stage compressor outlet pressure regulation
PID operation is carried out on the variable-frequency regulation target signal SP4, the second-section outlet pressure signal P4 and the second feedforward signal FF2, so that a second-section outlet pressure regulation instruction is obtained;
2.3 Second-stage anti-surge regulation and pressure regulation decoupling control
Selecting a command with larger opening degree from the two-section anti-surge regulating command and the two-section outlet pressure regulating command as a final command to be output, and controlling the opening degree of the two-section anti-surge valve;
3) Variable frequency adjustment control
PID operation is carried out on the variable frequency regulation target signal SP4, the second-section outlet pressure signal P4 and the first feedforward signal FF1 of the load of the combustion engine to obtain a variable frequency regulation instruction, when the second-section outlet pressure signal P4 is smaller than the variable frequency regulation target signal SP4, the frequency converter frequency is increased to increase the rotating speed of the unit, otherwise, the frequency converter frequency is decreased to reduce the rotating speed of the unit;
4) First-stage and second-stage pressure regulation decoupling control
When the pressure PID regulation parameters are set, PID regulation is carried out on the second-section outlet pressure P4 by adopting the same regulation rate, and then PID regulation is carried out on the first-section outlet pressure P2;
or adopting a mode of adjusting the first section and the second section simultaneously, performing PID adjustment on the first section outlet pressure P2 at a low rate, and performing PID adjustment on the second section outlet pressure P4 at a high rate;
5) Two-stage pressure regulation and variable frequency regulation decoupling
Pressurizing the variable-frequency regulation target signal SP4, and taking the pressurized variable-frequency regulation target signal as a second-stage pressure regulation given value SP4', so that the second-stage outlet pressure P4 fluctuates between SP4 and SP4'; the variable frequency regulation gradually reduces the rotating speed of the unit, the two-stage pressure regulation gradually reduces the opening degree of the two-stage anti-surge valve until reaching an anti-surge regulation line, the two-stage pressure regulation does not play a role any more at the moment, and the variable frequency regulation controls the two-stage outlet pressure P4 to reach the target value of a variable frequency regulation target signal SP 4;
6) Inlet throttle control
And (3) performing throttling PID (proportion integration differentiation) adjustment on the motor current adjustment target signal SP1 and the motor rated current signal, and controlling the opening of the inlet throttle valve.
9. The full-automatic constant pressure control method of a centrifugal compressor unit according to claim 8, wherein:
in the control mode 5), the step of pressurizing the variable frequency adjustment target signal SP4 specifically includes: the pressure of 0.05MPa is increased for the variable frequency adjustment target signal SP 4.
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| 离心压缩机串联运行的控制方案研究与实现;雷跃强;;石油化工自动化;20110220(第01期);正文26-30 * |
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