Multi-mode switching anti-surge control method for compressed air energy storage centrifugal compressor

Abstract

The invention relates to a multi-mode switching anti-surge control method for a compressed air energy storage centrifugal compressor, which comprises the following steps: acquiring pressure and flow information at an inlet of the compressor, calculating a deviation value and a deviation change rate, and determining a control mode by a microprocessor; the fuzzy control part determines a control trend by inquiring a fuzzy membership table, the PID control part controls pressure through an outer ring and controls flow through an inner ring, weights of the pressure and the flow are distributed by a switching function, and finally, an output current signal is used for controlling the opening degree of an anti-surge valve, so that the surge phenomenon is inhibited. Therefore, the problems that an existing anti-surge passive control method mainly stays at a traditional PI control level, but a traditional PID control algorithm is greatly influenced by disturbance and model mismatch, and the anti-surge control application effect is greatly influenced are solved, the method can cope with scenes such as large wind power fluctuation and strong reality of illumination uncertainty factors, and the method is suitable for large-scale popularization and application. The method is suitable for compressed air energy storage large-scale wind and light absorption.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a multi-mode switching anti-surge control method for a compressed air energy storage centrifugal compressor. Background Art

[0002] Compressed air energy storage is a storage technology with broad development prospects. It has the advantages of low construction cost, high energy storage efficiency and large energy storage capacity. Its working principle is similar to pumped storage. When the power consumption of the power system is at a low point, the electric energy is consumed to drive the air compressor and store the energy in the form of compressed air in the gas storage device; when the power load of the power system reaches a peak, the gas storage device releases the stored compressed air, which expands in the turbine expander to do work and drive the generator to generate electricity; according to the above principle, the compressed air energy storage system can complete the conversion of electric energy-air potential energy-electric energy.

[0003] Compressors are essential components in processes and equipment involving pressurized fluids, and surge in compressors can lead to huge economic losses. Anti-surge control has always been a difficult problem at home and abroad. Anti-surge control can be divided into active control and passive control. The research on active control is mainly to compensate for the stability of the compressor, and most of it is currently in the experimental stage. Passive control is relatively widely used, predicting surge based on flow and controlling flow within a safe range.

[0004] However, the existing anti-surge passive control methods mainly remain at the traditional PI control level, but the traditional PID control algorithm is greatly affected by disturbances and model mismatch, which greatly affects the effect of anti-surge control application and needs to be solved urgently. Summary of the invention

[0005] The present application provides a multi-mode switching anti-surge control method for a compressed air energy storage centrifugal compressor to solve the problems that the existing anti-surge passive control method mainly remains at the traditional PI control level, but the traditional PID control algorithm is greatly affected by disturbances and model mismatch, which greatly affects the effect of anti-surge control application.

[0006] The first aspect of the present application provides a multi-mode switching anti-surge control method for a compressed air energy storage centrifugal compressor, comprising the following steps: collecting air flow and pressure information at an air inlet of a target compressor, and converting the air flow and pressure information into corresponding analog voltage signals; calculating a deviation value and a deviation change rate corresponding to the air flow and pressure information according to the analog voltage signal, and judging whether the target compressor satisfies a preset anti-surge control start-up condition based on the deviation value and the deviation change rate, and determining an anti-surge control mode of an anti-surge PID controller in the target compressor when the target compressor satisfies the anti-surge control start-up condition; calculating an output function corresponding to the anti-surge control mode, and obtaining an anti-surge control current signal according to the output function, so as to control the opening of an anti-surge valve used for anti-surge control through the anti-surge control current signal.

[0007] Optionally, in one embodiment of the present application, the air flow and pressure information at the air inlet of the target compressor is collected, and the air flow and pressure information are converted into corresponding analog voltage signals, including: setting a data collection frequency corresponding to the target compressor, so that a preset pressure transmitter and flow transmitter collect the air flow and pressure information at the air inlet of the target compressor according to the data collection frequency; and using a preset digital-to-analog converter to convert the air flow and pressure information into corresponding analog voltage signals.

[0008] Optionally, in one embodiment of the present application, the deviation value and the deviation change rate corresponding to the air flow and the pressure information are calculated according to the analog voltage signal, and based on the deviation value and the deviation change rate, whether the target compressor meets the preset anti-surge control condition for starting, and when the target compressor meets the anti-surge control condition for starting, the anti-surge control mode of the anti-surge PID controller in the target compressor is determined, including: obtaining the standard values ​​corresponding to the air flow and the pressure information, and calculating the deviation value according to the standard values, the air flow and the pressure information, and calculating the deviation change rate based on the deviation value and a preset second-order numerical differential strategy; determining a first deviation threshold and a second deviation threshold corresponding to the deviation value, and determining the first deviation threshold and the second deviation threshold according to the deviation value, the first deviation threshold and the first deviation threshold. The second deviation threshold constructs a control mode switching function, so as to compare the deviation value with the first deviation threshold and the second deviation threshold respectively based on the control mode switching function, wherein the first deviation threshold is less than the second deviation threshold; if the deviation value is greater than the first deviation threshold and less than the second deviation threshold, the preset fuzzy PID compound control operation is performed by the anti-surge PID controller; if the deviation value is less than the first deviation threshold, the preset outer loop controller and inner loop controller are respectively controlled by the anti-surge PID controller to perform fuzzy PI pressure prediction operation and fuzzy PD flow control operation; if the deviation value is greater than the second deviation threshold, the preset fuzzy control operation is performed by the anti-surge PID controller according to the deviation value, the deviation change rate and a preset fuzzy rule table.

[0009] Optionally, in one embodiment of the present application, controlling the opening of an anti-surge valve for anti-surge control by the anti-surge control current signal includes: comparing the anti-surge control current signal with a first preset signal threshold and a second preset signal threshold, respectively, wherein the first preset signal threshold is less than the second preset signal threshold; if the anti-surge control current signal is equal to the first preset signal threshold, performing a fully open operation on the anti-surge valve; if the anti-surge control current signal is equal to the second preset signal threshold, performing a fully closed operation on the anti-surge valve.

[0010] The second aspect of the present application provides a multi-mode switching anti-surge control device for a compressed air energy storage centrifugal compressor, comprising: an acquisition module, used to acquire air flow and pressure information at the air inlet of a target compressor, and convert the air flow and the pressure information into corresponding analog voltage signals; a judgment module, used to calculate a deviation value and a deviation change rate corresponding to the air flow and the pressure information according to the analog voltage signal, and based on the deviation value and the deviation change rate, judge whether the target compressor meets a preset anti-surge control condition for starting, and when the target compressor meets the anti-surge control condition for starting, determine the anti-surge control mode of the anti-surge PID controller in the target compressor; a control module, used to calculate an output function corresponding to the anti-surge control mode, and obtain an anti-surge control current signal according to the output function, so as to control the opening of an anti-surge valve used for anti-surge control through the anti-surge control current signal.

[0011] Optionally, in one embodiment of the present application, the acquisition module includes: a setting unit, used to set the data acquisition frequency corresponding to the target compressor, so that a preset pressure transmitter and flow transmitter collect the air flow and the pressure information at the air inlet of the target compressor according to the data acquisition frequency; a conversion unit, used to use a preset digital-to-analog converter to convert the air flow and the pressure information into corresponding analog voltage signals.

[0012] Optionally, in one embodiment of the present application, the judgment module includes: an acquisition unit, used to acquire standard values ​​corresponding to the air flow and the pressure information, and calculate the deviation value according to the standard value, the air flow and the pressure information, and calculate the deviation change rate based on the deviation value and a preset second-order numerical differential strategy; a construction unit, used to determine a first deviation threshold and a second deviation threshold corresponding to the deviation value, and construct a control mode switching function according to the deviation value, the first deviation threshold and the second deviation threshold, so as to compare the deviation value with the first deviation threshold and the second deviation threshold respectively based on the control mode switching function, wherein the first deviation threshold value is less than the second deviation threshold; a first analysis unit is used to perform a preset fuzzy PID compound control operation through the anti-surge PID controller if the deviation value is greater than the first deviation threshold and less than the second deviation threshold; a second analysis unit is used to control a preset outer loop controller and an inner loop controller to perform a fuzzy PI pressure prediction operation and a fuzzy PD flow control operation respectively through the anti-surge PID controller if the deviation value is less than the first deviation threshold; a third analysis unit is used to perform a preset fuzzy control operation according to the deviation value, the deviation change rate and a preset fuzzy rule table through the anti-surge PID controller if the deviation value is greater than the second deviation threshold.

[0013] Optionally, in one embodiment of the present application, the control module includes: a comparison unit, used to compare the anti-surge control current signal with a first preset signal threshold and a second preset signal threshold, respectively, wherein the first preset signal threshold is less than the second preset signal threshold; a first execution unit, used to perform a full-open operation on the anti-surge valve if the anti-surge control current signal is equal to the first preset signal threshold; and a second execution unit, used to perform a full-close operation on the anti-surge valve if the anti-surge control current signal is equal to the second preset signal threshold.

[0014] The third aspect of the present application provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the multi-mode switching anti-surge control method for a compressed air energy storage centrifugal compressor as described in the above embodiment.

[0015] The fourth aspect embodiment of the present application provides a computer-readable storage medium, which stores a computer program, and when the program is executed by a processor, it implements the above-mentioned multi-mode switching anti-surge control method for a compressed air energy storage centrifugal compressor.

[0016] The fifth aspect of the present application provides a computer program product, including a computer program, which is executed to implement the above-mentioned multi-mode switching anti-surge control method for a compressed air energy storage centrifugal compressor.

[0017] Therefore, the embodiments of the present application have the following beneficial effects:

[0018] The embodiment of the present application can collect the air flow and pressure information at the air inlet of the target compressor, and convert the air flow and pressure information into a corresponding analog voltage signal; calculate the deviation value and deviation change rate corresponding to the air flow and pressure information according to the analog voltage signal, and judge whether the target compressor meets the preset anti-surge control conditions based on the deviation value and the deviation change rate, and determine the anti-surge control mode of the anti-surge PID controller in the target compressor when the target compressor meets the anti-surge control conditions; calculate the output function corresponding to the anti-surge control mode, and obtain the anti-surge control current signal according to the output function, so as to control the opening of the anti-surge valve used for anti-surge control through the anti-surge control current signal. The present application not only inherits the advantages of the PID algorithm by utilizing the fuzzy PID sliding mode control algorithm, but also integrates the advantages of fuzzy control and sliding mode control, and can play a better role in the anti-surge control application. Therefore, the existing anti-surge passive control method mainly stays at the traditional PI control level, but the traditional PID control algorithm is greatly affected by disturbances and model mismatch, which greatly affects the effect of anti-surge control application.

[0019] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0021] Figure 1 A flowchart of a multi-mode switching anti-surge control method for a compressed air energy storage centrifugal compressor provided according to an embodiment of the present application;

[0022] Figure 2 A schematic diagram of the execution logic of a multi-mode switching anti-surge control method for a compressed air energy storage centrifugal compressor provided in one embodiment of the present application;

[0023] Figure 3 A surge line characteristic diagram of each stage of a four-stage compressor provided in one embodiment of the present application;

[0024] Figure 4 A PID dual-loop control block diagram provided for an embodiment of the present application;

[0025] Figure 5 This is an example diagram of a multi-mode switching anti-surge control device for a compressed air energy storage centrifugal compressor according to an embodiment of the present application;

[0026] Figure 6 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

[0027] Among them, 10-compressed air energy storage centrifugal compressor multi-mode switching anti-surge control device; 100-acquisition module, 200-judgment module, 300-control module; 601-memory, 602-processor, 603-communication interface. DETAILED DESCRIPTION

[0028] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0029] The following describes the multi-mode switching anti-surge control method of the compressed air energy storage centrifugal compressor of the embodiment of the present application with reference to the accompanying drawings. In view of the problems mentioned in the above background technology, the present application provides a multi-mode switching anti-surge control method for the compressed air energy storage centrifugal compressor, in which the air flow and pressure information at the air inlet of the target compressor is collected, and the air flow and pressure information are converted into corresponding analog voltage signals; the deviation value and deviation change rate corresponding to the air flow and pressure information are calculated according to the analog voltage signal, and based on the deviation value and the deviation change rate, it is judged whether the target compressor meets the preset anti-surge control conditions, and when the target compressor meets the anti-surge control conditions, the anti-surge control mode of the anti-surge PID controller in the target compressor is determined; the output function corresponding to the anti-surge control mode is calculated, and the anti-surge control current signal is obtained according to the output function, so as to control the opening of the anti-surge valve used for anti-surge control through the anti-surge control current signal. By utilizing the fuzzy PID sliding mode control algorithm, the present application not only inherits the advantages of the PID algorithm, but also integrates the advantages of fuzzy control and sliding mode control, and can play a better role in anti-surge control applications. As a result, the problems that the existing anti-surge passive control methods mainly remain at the traditional PI control level, but the traditional PID control algorithm is greatly affected by disturbances and model mismatch, which greatly affects the effect of anti-surge control applications, are solved.

[0030] Specifically, Figure 1 A flow chart of a multi-mode switching anti-surge control method for a compressed air energy storage centrifugal compressor provided in an embodiment of the present application.

[0031] like Figure 1 As shown, the multi-mode switching anti-surge control method for the compressed air energy storage centrifugal compressor includes the following steps:

[0032] In step S101 , air flow and pressure information at an air inlet of a target compressor is collected, and the air flow and pressure information is converted into corresponding analog voltage signals.

[0033] The embodiment of the present application can first collect the air flow and pressure information at the compressor inlet, convert it into a corresponding analog voltage signal through a digital-to-analog converter, and send it to the microprocessor.

[0034] Optionally, in one embodiment of the present application, air flow and pressure information at the air inlet of the target compressor is collected, and the air flow and pressure information is converted into corresponding analog voltage signals, including: setting a data collection frequency corresponding to the target compressor so that a preset pressure transmitter and flow transmitter collect the air flow and pressure information at the air inlet of the target compressor according to the data collection frequency; and using a preset digital-to-analog converter to convert the air flow and pressure information into corresponding analog voltage signals.

[0035] In the actual implementation process, the embodiments of the present application can collect the air flow and pressure information at the compressor inlet at a data collection frequency of 12 times per second through signal acquisition devices such as pressure transmitters and flow transmitters; send the air flow and pressure information to ADC devices such as XTR110 to obtain the corresponding analog voltage signal, and the output voltage range is 0 to 3V; thereafter, the embodiments of the present application can send the analog voltage signal to microprocessor chips such as TMS320F2812.

[0036] In step S102, the deviation value and the deviation change rate corresponding to the air flow and pressure information are calculated according to the analog voltage signal, and based on the deviation value and the deviation change rate, it is determined whether the target compressor meets the preset anti-surge control conditions for starting, and when the target compressor meets the anti-surge control conditions for starting, the anti-surge control mode of the anti-surge PID controller in the target compressor is determined.

[0037] Furthermore, the embodiment of the present application also requires the microprocessor to calculate the deviation value e and the deviation change rate e according to the analog voltage signal corresponding to the air flow and pressure information. c , and through the deviation value e and the deviation change rate e c Determine whether the anti-surge PID controller needs to perform anti-surge control and the anti-surge control method.

[0038] Optionally, in one embodiment of the present application, a deviation value and a deviation change rate corresponding to the air flow and pressure information are calculated according to an analog voltage signal, and based on the deviation value and the deviation change rate, it is determined whether the target compressor meets the preset anti-surge control conditions for starting, and when the target compressor meets the anti-surge control conditions for starting, the anti-surge control mode of the anti-surge PID controller in the target compressor is determined, including: obtaining standard values ​​corresponding to the air flow and pressure information, and calculating the deviation value according to the standard value, the air flow and pressure information, and calculating the deviation change rate based on the deviation value and a preset second-order numerical differential strategy; determining a first deviation threshold and a second deviation threshold corresponding to the deviation value, and determining a first deviation threshold and a second deviation threshold according to the deviation value, the first deviation threshold and the second deviation threshold. A control mode switching function is constructed based on a threshold value, so as to compare the deviation value with a first deviation threshold value and a second deviation threshold value respectively based on the control mode switching function, wherein the first deviation threshold value is less than the second deviation threshold value; if the deviation value is greater than the first deviation threshold value and less than the second deviation threshold value, a preset fuzzy PID compound control operation is performed through an anti-surge PID controller; if the deviation value is less than the first deviation threshold value, a preset outer loop controller and an inner loop controller are respectively controlled by the anti-surge PID controller to perform a fuzzy PI pressure prediction operation and a fuzzy PD flow control operation; if the deviation value is greater than the second deviation threshold value, a preset fuzzy control operation is performed according to the deviation value, the deviation change rate and a preset fuzzy rule table through the anti-surge PID controller.

[0039] It should be noted that, in the embodiment of the present application, the deviation value e is first calculated by the difference between the sample value and the standard value, and the deviation change rate e is calculated by using the second-order numerical differentiation. c .

[0040] Secondly, the embodiment of the present application can determine the switching function of the sliding film controller through the deviation value and the deviation change rate, as shown in the following formula:

[0041] u=αu PID +(1-α)u FU

[0042]

[0043] Among them, e a is the first deviation threshold, e b is the second deviation threshold, and both are deviation thresholds automatically set by the microcomputer program according to a predetermined deviation range; u PID Indicates PID control mode, u FU represents the fuzzy control mode, α is the switching function; Figure 2 As shown, the following control mode conversion rules can be obtained from the switching function:

[0044] 1. When 0<e<e aWhen , the controller performs PID control, which is equivalent to a conventional PID controller;

[0045] 2. When e a <e<e b When , the controller performs fuzzy PID compound control, which is equivalent to a fuzzy PID controller;

[0046] 3. When e>e b When , the controller performs fuzzy control, which is equivalent to a fuzzy controller.

[0047] Therefore, in order to obtain better performance, the embodiment of the present application adopts fuzzy control through switching functions and dual-mode control strategies within a large deviation range to obtain good transient performance; within a small deviation range, that is, when e falls within the threshold, it is converted into fuzzy and PD (or PI) composite control; in the case of extremely small deviations, precise PID control is used to obtain good steady-state performance.

[0048] In the specific implementation process, considering the coupling relationship between multi-stage compressors, the deviation threshold is often different for compressors of different stages, which is usually given by the characteristic surge line of each stage compressor. Taking a four-stage compressor as an example, the relationship between the pressure head and the inlet flow rate of each stage is as follows: Figure 3 shown.

[0049] In the actual implementation process, when the anti-surge PID controller performs PID control, it is equivalent to a conventional PID controller. The anti-surge PID controller in the embodiment of the present application has two control loops, inner and outer; wherein the inner loop controller controls the compressor outlet pressure so that the pressure system G U-ψ (s) The pressure can be effectively controlled; since the pressure directly affects the compressor flow, the embodiment of the present application can redesign the outer loop controller to control the compressor flow system G ψ-φ The flow rate value (s) reaches the set value.

[0050] Since there may be errors or even noise in pressure and flow measurement, during simulation, the embodiment of the present application may add white noise to the pressure and measurement links to simulate noise input, such as Figure 4 As shown in Figure 1, the expression between the pressure deviation E(s) and the anti-surge valve controller output U(s) is:

[0051]

[0052] The expression between flow deviation E(s) and pressure controller output U(s) is:

[0053]

[0054] In addition, when the anti-surge PID controller performs fuzzy control, it is equivalent to a fuzzy controller; it should be noted that the conventional PID is based on an accurate mathematical model for control and does not have the function of online parameter tuning. The core of fuzzy control design is to summarize the technical knowledge and practical operation experience of engineering designers and establish a suitable fuzzy rule table. The fuzzy rule table of the embodiment of the present application is as follows:

[0055] Table 1

[0056]

[0057] Among them, e is the deviation value, e c is the deviation change rate, and the embodiment of the present application can be based on e and e c The value of determines the position in the fuzzy rule table; the elements in the table are sorted by K P / K I / K D Regular arrangement, K P is the proportionality coefficient, K I is the integration coefficient, K D is the differential coefficient, and the elements in the fuzzy subset {NB, NM, NS, ZO, PS, PM, PB} represent negative large, negative medium, negative small, zero, positive small, positive medium, and positive large, respectively. The design principle is as follows:

[0058] 1. Proportional coefficient K P It can speed up the response of the surge system and improve the regulation accuracy of the surge system; once the surge system deviates, the proportional regulation will immediately take effect to reduce the error. P The larger the value of is, the faster the surge system responds, but K P If the value of is too large, it will cause oscillation and even lead to surge system instability. Therefore, when the deviation e is large, K P The value of is appropriately increased;

[0059] 2. Integral coefficient K I The steady-state error of the surge system can be eliminated; the larger the value, the faster the integration speed, and the faster the static error of the surge system is eliminated, but K I If the value is too large, the surge system will produce integral saturation in the early stage of the response process, causing a large overshoot in the response process and deteriorating the dynamic performance of the system.

[0060] 3. Differential coefficient K D It is used to improve the dynamic characteristics of the surge system, reflect the change rate of the surge system deviation signal and predict the trend of the deviation change, and can produce advanced control to reduce the overshoot of the surge system and increase the stability of the surge system; but K DThe value cannot be too large, otherwise the response process will be braked in advance and the surge system adjustment time will be prolonged, and the anti-interference ability of the surge system will be worse.

[0061] Therefore, the embodiment of the present application can select a suitable anti-surge control method according to different deviation values, and optimize the control effect, thereby effectively avoiding the occurrence of surge out of control and improving the overall economy of the system.

[0062] In step S103, an output function corresponding to the anti-surge control mode is calculated, and an anti-surge control current signal is obtained according to the output function, so as to control the opening of an anti-surge valve for anti-surge control through the anti-surge control current signal.

[0063] Afterwards, the embodiment of the present application determines the output function corresponding to the anti-surge control mode, and obtains the anti-surge control current signal according to the output function, so as to control the opening of the anti-surge valve through the anti-surge control current signal, thereby suppressing the occurrence of surge.

[0064] Optionally, in one embodiment of the present application, the opening of an anti-surge valve for anti-surge control is controlled by an anti-surge control current signal, including: comparing the anti-surge control current signal with a first preset signal threshold and a second preset signal threshold, respectively, wherein the first preset signal threshold is less than the second preset signal threshold; if the anti-surge control current signal is equal to the first preset signal threshold, performing a fully open operation on the anti-surge valve; if the anti-surge control current signal is equal to the second preset signal threshold, performing a fully closed operation on the anti-surge valve.

[0065] It should be noted that, in the embodiment of the present application, the Laplace transform can be performed on the small disturbance equation of the compressor mass flow rate to obtain the transfer function of the compressor dimensionless pressure and the anti-surge valve opening:

[0066]

[0067] The transfer function between the dimensionless pressure and flow of the compressor is as follows:

[0068]

[0069] Since the anti-surge valve needs to act as quickly as possible, the embodiment of the present application can select a self-positioning pneumatic valve, and the input signal adopts a standard 4-20mA. Considering the certain hysteresis and inertia of the valve mechanical device, the embodiment of the present application can approximate the action characteristics of the valve as a second-order hysteresis system:

[0070]

[0071] Where, τ is the valve lag time, K v is the valve gain.

[0072] According to the compressor and pipe network characteristic curve, the embodiment of the present application can select the surge control point as the normal working point. ψ e =2.64, converted to real units, the mass flow rate m at this time is 1.7185kg / s, and the pressure rise value is 161533Pa. Substituting it into the linearized equation, the transfer function of the compressor dimensionless pressure and the anti-surge valve opening can be obtained:

[0073]

[0074] The transfer function between the dimensionless pressure and flow of the compressor is as follows:

[0075]

[0076] Before designing the inner loop control in the embodiment of the present application, the control object must be processed. The transfer function of the pressure system is a fourth-order system, which is a high-order system, as shown in the following formula:

[0077]

[0078] Therefore, the embodiment of the present application needs to reduce the order to a low-order system to facilitate the design of the controller. By analyzing the Bode diagram of the system before reduction, its turning frequency is 1 rad / s and meets the characteristics of a second-order system, so it can be approximately equivalent to a second-order system.

[0079] Generally, it works in a low-frequency state. After the order reduction, its low-frequency band is basically consistent with the original system, and the system after the order reduction has a small lag link, as shown in the following formula:

[0080]

[0081] Therefore, the embodiments of the present application can convert the control system output into a 4-20mA current signal to control the opening of the anti-surge valve. The anti-surge valve adopts an "air-closed type". When the control signal is minimum (4mA) (i.e., the first preset signal threshold), the anti-surge valve is fully open; when the control signal is maximum (20mA) (i.e., the second preset signal threshold), the anti-surge valve is fully closed.

[0082] It can be understood that the embodiment of the present application utilizes fuzzy-PID to control the anti-surge of the compressor of the compressed air energy storage system, and its anti-surge effect has good dynamic characteristics and excellent steady-state characteristics, high economy, strong flexibility, and good anti-interference and robustness performance. It is very suitable for systems with uncertain and complex factors such as air intake volume, wind pressure, nonlinear power generation, time-varying, strong interference, etc.

[0083] According to the multi-mode switching anti-surge control method of the compressed air energy storage centrifugal compressor proposed in the embodiment of the present application, the air flow and pressure information at the air inlet of the target compressor is collected, and the air flow and pressure information are converted into corresponding analog voltage signals; the deviation value and deviation change rate corresponding to the air flow and pressure information are calculated according to the analog voltage signal, and based on the deviation value and deviation change rate, it is judged whether the target compressor meets the preset anti-surge control conditions, and when the target compressor meets the anti-surge control conditions, the anti-surge control mode of the anti-surge PID controller in the target compressor is determined; the output function corresponding to the anti-surge control mode is calculated, and the anti-surge control current signal is obtained according to the output function, so as to control the opening of the anti-surge valve used for anti-surge control through the anti-surge control current signal. By utilizing the fuzzy PID sliding mode control algorithm, the present application not only inherits the advantages of the PID algorithm, but also integrates the advantages of fuzzy control and sliding mode control, and can play a better role in anti-surge control applications.

[0084] Secondly, the multi-mode switching anti-surge control device of the compressed air energy storage centrifugal compressor proposed in accordance with the embodiment of the present application is described with reference to the accompanying drawings.

[0085] Figure 5 It is a block diagram of a multi-mode switching anti-surge control device for a compressed air energy storage centrifugal compressor in an embodiment of the present application.

[0086] like Figure 5 As shown, the multi-mode switching anti-surge control device 10 for a compressed air energy storage centrifugal compressor includes: a collection module 100 , a judgment module 200 and a control module 300 .

[0087] The acquisition module 100 is used to acquire the air flow and pressure information at the air inlet of the target compressor, and convert the air flow and pressure information into corresponding analog voltage signals.

[0088] The judgment module 200 is used to calculate the deviation value and the deviation change rate corresponding to the air flow and pressure information according to the analog voltage signal, and based on the deviation value and the deviation change rate, judge whether the target compressor meets the preset anti-surge control conditions, and determine the anti-surge control mode of the anti-surge PID controller in the target compressor when the target compressor meets the anti-surge control conditions.

[0089] The control module 300 is used to calculate the output function corresponding to the anti-surge control mode, and obtain the anti-surge control current signal according to the output function, so as to control the opening of the anti-surge valve used for anti-surge control through the anti-surge control current signal.

[0090] Optionally, in one embodiment of the present application, the acquisition module 100 includes: a setting unit and a conversion unit.

[0091] Among them, the setting unit is used to set the data collection frequency corresponding to the target compressor, so that the preset pressure transmitter and flow transmitter collect the air flow and pressure information at the air inlet of the target compressor according to the data collection frequency.

[0092] The conversion unit is used to convert the air flow and pressure information into corresponding analog voltage signals using a preset digital-to-analog converter.

[0093] Optionally, in one embodiment of the present application, the judgment module 200 includes: an acquisition unit, a construction unit, a first analysis unit, a second analysis unit and a third analysis unit.

[0094] Among them, the acquisition unit is used to obtain the standard values ​​corresponding to the air flow and pressure information, and calculate the deviation value according to the standard value, the air flow and pressure information, and calculate the deviation change rate based on the deviation value and a preset second-order numerical differential strategy.

[0095] A construction unit is used to determine a first deviation threshold and a second deviation threshold corresponding to the deviation value, and to construct a control mode switching function according to the deviation value, the first deviation threshold and the second deviation threshold, so as to compare the deviation value with the first deviation threshold and the second deviation threshold respectively based on the control mode switching function, wherein the first deviation threshold is smaller than the second deviation threshold.

[0096] The first analyzing unit is configured to execute a preset fuzzy PID compound control operation through an anti-surge PID controller if the deviation value is greater than a first deviation threshold and less than a second deviation threshold.

[0097] The second analysis unit is used to control the preset outer loop controller and inner loop controller to perform fuzzy PI pressure prediction operation and fuzzy PD flow control operation respectively through the anti-surge PID controller if the deviation value is less than the first deviation threshold.

[0098] The third analyzing unit is used to perform a preset fuzzy control operation according to the deviation value, the deviation change rate and a preset fuzzy rule table through the anti-surge PID controller if the deviation value is greater than a second deviation threshold.

[0099] Optionally, in one embodiment of the present application, the control module 300 includes: a comparison unit, a first execution unit and a second execution unit.

[0100] The comparison unit is used to compare the anti-surge control current signal with a first preset signal threshold and a second preset signal threshold respectively, wherein the first preset signal threshold is smaller than the second preset signal threshold.

[0101] The first execution unit is configured to execute a full-opening operation on the anti-surge valve if the anti-surge control current signal is equal to a first preset signal threshold.

[0102] The second execution unit is configured to execute a full-closing operation on the anti-surge valve if the anti-surge control current signal is equal to a second preset signal threshold.

[0103] It should be noted that the above explanation of the embodiment of the multi-mode switching anti-surge control method for a compressed air energy storage centrifugal compressor is also applicable to the multi-mode switching anti-surge control device for a compressed air energy storage centrifugal compressor of this embodiment, and will not be repeated here.

[0104] According to the multi-mode switching anti-surge control device of the compressed air energy storage centrifugal compressor proposed in the embodiment of the present application, it includes a collection module for collecting air flow and pressure information at the air inlet of the target compressor, and converting the air flow and pressure information into a corresponding analog voltage signal; a judgment module for calculating the deviation value and deviation change rate corresponding to the air flow and pressure information according to the analog voltage signal, and judging whether the target compressor meets the preset anti-surge control conditions based on the deviation value and the deviation change rate, and determining the anti-surge control mode of the anti-surge PID controller in the target compressor when the target compressor meets the anti-surge control conditions; a control module for calculating the output function corresponding to the anti-surge control mode, and obtaining the anti-surge control current signal according to the output function, so as to control the opening of the anti-surge valve used for anti-surge control through the anti-surge control current signal. By utilizing the fuzzy PID sliding mode control algorithm, the present application not only inherits the advantages of the PID algorithm, but also integrates the advantages of fuzzy control and sliding mode control, and can play a better role in anti-surge control applications.

[0105] Figure 6 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. The electronic device may include:

[0106] A memory 601 , a processor 602 , and a computer program stored in the memory 601 and executable on the processor 602 .

[0107] When the processor 602 executes the program, the multi-mode switching anti-surge control method for the compressed air energy storage centrifugal compressor provided in the above embodiment is implemented.

[0108] Furthermore, the electronic device further comprises:

[0109] The communication interface 603 is used for communication between the memory 601 and the processor 602 .

[0110] The memory 601 is used to store computer programs that can be executed on the processor 602 .

[0111] The memory 601 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0112] If the memory 601, the processor 602 and the communication interface 603 are implemented independently, the communication interface 603, the memory 601 and the processor 602 can be connected to each other through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 6 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0113] Optionally, in a specific implementation, if the memory 601, the processor 602 and the communication interface 603 are integrated on a chip, the memory 601, the processor 602 and the communication interface 603 can communicate with each other through an internal interface.

[0114] The processor 602 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0115] An embodiment of the present application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-mentioned multi-mode switching anti-surge control method for a compressed air energy storage centrifugal compressor.

[0116] An embodiment of the present application also provides a computer program product, including a computer program, which, when executed, is used to implement the above-mentioned multi-mode switching anti-surge control method for a compressed air energy storage centrifugal compressor.

[0117] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0118] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0119] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0120] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or N wirings (electronic devices), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways as necessary and then storing it in a computer memory.

[0121] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0122] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0123] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0124] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A multi-mode switching anti-surge control method for a compressed air energy storage centrifugal compressor, characterized in that: The following steps are involved: Collecting air flow and pressure information at the air inlet of the target compressor, and converting the air flow and pressure information into corresponding analog voltage signals; Calculating a deviation value and a deviation change rate corresponding to the air flow rate and the pressure information according to the analog voltage signal, and judging whether the target compressor satisfies a preset anti-surge control start condition based on the deviation value and the deviation change rate, and determining an anti-surge control mode of an anti-surge PID controller in the target compressor when the target compressor satisfies the anti-surge control start condition; An output function corresponding to the anti-surge control mode is calculated, and an anti-surge control current signal is obtained according to the output function, so as to control the opening of an anti-surge valve used for anti-surge control through the anti-surge control current signal.

2. The method according to claim 1, characterized in that The collecting of air flow and pressure information at the air inlet of the target compressor and converting the air flow and pressure information into corresponding analog voltage signals includes: Setting a data collection frequency corresponding to the target compressor so that a preset pressure transmitter and a flow transmitter collect the air flow and the pressure information at the air inlet of the target compressor according to the data collection frequency; The air flow and pressure information are converted into corresponding analog voltage signals using a preset digital-to-analog converter.

3. The method according to claim 2, characterized in that The step of calculating the deviation value and the deviation change rate corresponding to the air flow rate and the pressure information according to the analog voltage signal, and judging whether the target compressor satisfies a preset anti-surge control condition based on the deviation value and the deviation change rate, and determining the anti-surge control mode of the anti-surge PID controller in the target compressor when the target compressor satisfies the anti-surge control condition, includes: Obtaining standard values ​​corresponding to the air flow and the pressure information, and calculating the deviation value according to the standard value, the air flow and the pressure information, and calculating the deviation change rate based on the deviation value and a preset second-order numerical differential strategy; determining a first deviation threshold and a second deviation threshold corresponding to the deviation value, and constructing a control mode switching function according to the deviation value, the first deviation threshold and the second deviation threshold, so as to compare the deviation value with the first deviation threshold and the second deviation threshold respectively based on the control mode switching function, wherein the first deviation threshold is less than the second deviation threshold; If the deviation value is greater than the first deviation threshold and less than the second deviation threshold, a preset fuzzy PID compound control operation is performed by the anti-surge PID controller; If the deviation value is less than the first deviation threshold, the anti-surge PID controller controls the preset outer loop controller and the inner loop controller to perform fuzzy PI pressure prediction operation and fuzzy PD flow control operation respectively; If the deviation value is greater than the second deviation threshold, a preset fuzzy control operation is performed by the anti-surge PID controller according to the deviation value, the deviation change rate and a preset fuzzy rule table.

4. The method according to claim 3, characterized in that The controlling the opening of the anti-surge valve for anti-surge control by the anti-surge control current signal comprises: Comparing the anti-surge control current signal with a first preset signal threshold and a second preset signal threshold respectively, wherein the first preset signal threshold is less than the second preset signal threshold; If the anti-surge control current signal is equal to the first preset signal threshold, performing a full-opening operation on the anti-surge valve; If the anti-surge control current signal is equal to the second preset signal threshold, the anti-surge valve is fully closed.

5. A multi-mode switching anti-surge control device for a compressed air energy storage centrifugal compressor, characterized in that: include: An acquisition module, used for acquiring air flow and pressure information at an air inlet of a target compressor, and converting the air flow and pressure information into corresponding analog voltage signals; a judgment module, configured to calculate a deviation value and a deviation change rate corresponding to the air flow rate and the pressure information according to the analog voltage signal, and to judge whether the target compressor satisfies a preset start-up anti-surge control condition based on the deviation value and the deviation change rate, and to determine an anti-surge control mode of an anti-surge PID controller in the target compressor when the target compressor satisfies the start-up anti-surge control condition; The control module is used to calculate the output function corresponding to the anti-surge control mode, and obtain an anti-surge control current signal according to the output function, so as to control the opening of the anti-surge valve used for anti-surge control through the anti-surge control current signal.

6. The device according to claim 5, characterized in that The acquisition module comprises: A setting unit, used for setting a data collection frequency corresponding to the target compressor, so that a preset pressure transmitter and a flow transmitter collect the air flow and the pressure information at the air inlet of the target compressor according to the data collection frequency; The conversion unit is used to convert the air flow and the pressure information into corresponding analog voltage signals using a preset digital-to-analog converter.

7. The device according to claim 6, characterized in that The judging module comprises: an acquisition unit, configured to acquire standard values ​​corresponding to the air flow rate and the pressure information, calculate the deviation value according to the standard value, the air flow rate and the pressure information, and calculate the deviation change rate based on the deviation value and a preset second-order numerical differential strategy; a construction unit, configured to determine a first deviation threshold and a second deviation threshold corresponding to the deviation value, and to construct a control mode switching function according to the deviation value, the first deviation threshold and the second deviation threshold, so as to compare the deviation value with the first deviation threshold and the second deviation threshold respectively based on the control mode switching function, wherein the first deviation threshold is less than the second deviation threshold; a first analyzing unit, configured to perform a preset fuzzy PID compound control operation through the anti-surge PID controller if the deviation value is greater than the first deviation threshold and less than the second deviation threshold; a second analyzing unit, configured to control a preset outer loop controller and an inner loop controller to perform a fuzzy PI pressure prediction operation and a fuzzy PD flow control operation respectively through the anti-surge PID controller if the deviation value is less than the first deviation threshold; The third analysis unit is configured to perform a preset fuzzy control operation according to the deviation value, the deviation change rate and a preset fuzzy rule table through the anti-surge PID controller if the deviation value is greater than the second deviation threshold.

8. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the multi-mode switching anti-surge control method for a compressed air energy storage centrifugal compressor as described in any one of claims 1 to 4.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the multi-mode switching anti-surge control method for a compressed air energy storage centrifugal compressor as described in any one of claims 1 to 4.

10. A computer program product, comprising a computer program, characterized in that The computer program is executed to implement the multi-mode switching anti-surge control method for a compressed air energy storage centrifugal compressor as described in any one of claims 1 to 4.

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