Logic optimization system for parallel operation of double-unit backpressure turbine of industrial steam supply turbine

Abstract

The invention relates to the field of industrial automation control, in particular to an industrial steam supply turbine double-unit backpressure turbine parallel operation logic optimization system which comprises a data acquisition module used for acquiring operation parameters of a main unit and an auxiliary unit in real time and the real-time opening degree of a backpressure turbine steam inlet adjusting door; and the steam supply margin index calculation module is connected with the data acquisition module, and is used for carrying out parallel calculation to obtain a main unit steam supply margin index representing the steam supply potential of the main unit and an auxiliary unit steam supply margin index representing the steam supply potential of the auxiliary unit based on the operation parameters and the real-time opening degree. According to the method, the valve change rate factor calculated on the basis of the real-time opening degree of the steam inlet adjusting door of the back pressure turbine for the time change rate is introduced, the system can recognize the change trend of the steam supply requirement, therefore, the control action is started before the steam supply pressure is obviously deviated, and the hysteresis quality of the control process is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of industrial automation control, and particularly relates to a system for optimizing the parallel operation logic of dual back-pressure turbine units of an industrial steam turbine. BACKGROUND

[0002] In industrial production processes, industrial steam turbines are key equipment for providing steam required by production. In a conventional operation mode, a single main unit usually undertakes the main steam supply task. With fluctuations in steam demand on the user side, especially when the demand exceeds the maximum steam supply capacity of the single main unit under its current operating condition, another auxiliary unit needs to be started for parallel operation to supplement steam supply and maintain the stability of the steam supply pipe network pressure.

[0003] In the prior art, the control logic for realizing the parallel operation of dual units usually relies on monitoring a single, direct operating indicator. For example, some control schemes directly monitor the opening degree of the steam inlet adjustment door of the back-pressure turbine of the main unit. The logic is that when the opening degree of the adjustment door continuously stays at a preset, relatively high fixed threshold, it is considered that the steam supply capacity of the main unit has reached saturation.

[0004] In order to avoid false operation caused by temporary demand fluctuations, a fixed time delay must also be introduced in this control scheme. That is, only when the state of the adjustment door opening degree being higher than the threshold has lasted for a fixed time, the system will finally confirm that the steam supply capacity is indeed insufficient, and trigger the instruction to start the auxiliary unit.

[0005] However, this control scheme that completely relies on a single indicator, a static threshold and a fixed time delay is essentially a lagging, passive response mechanism. Its core defect is that the premise of the control action is that the steam supply system is already in a state of high load and low margin, and this state has lasted for a considerable period of time. This scheme cannot perceive the change trend of steam demand - for example, it cannot distinguish whether the adjustment door opening degree is slowly rising to the threshold or is rapidly opened in a short time. Therefore, when the user's steam demand increases rapidly, the control system must wait for the adjustment door opening degree to actually cross the threshold and then wait for a fixed delay, which accumulates a significant response delay. During this delay period, the steam supply pressure may have started to drop, so that proactive control actions cannot be taken before the pressure deviates significantly, resulting in the lagging nature of the entire coordinated control process. SUMMARY

[0006] In order to make up for the above shortcomings, the present application provides a system for optimizing the parallel operation logic of dual back-pressure turbine units of an industrial steam turbine, which aims to improve the situation that only by monitoring a single operating indicator with a static threshold and a fixed delay, the change trend of steam demand cannot be identified, resulting in inherent lagging nature of the control action.

[0007] In a first aspect, the present invention provides the following technical solution: a logic optimization system for parallel operation of dual-unit back-pressure turbines in industrial steam supply, comprising:

[0008] The data acquisition module is used to collect the operating parameters of the main unit and auxiliary unit in real time, as well as the real-time opening of the back pressure turbine steam inlet regulating valve;

[0009] The steam supply margin index calculation module is connected to the data acquisition module. It is used to calculate the main unit steam supply margin index, which represents the steam supply potential of the main unit, and the auxiliary unit steam supply margin index, which represents the steam supply potential of the auxiliary unit, in parallel based on the operating parameters and real-time opening degree.

[0010] The collaborative attitude decision module, connected to the steam supply margin index calculation module, is used to determine the system collaborative attitude that the system should currently execute based on the combined state of the steam supply margin index of the main unit and the steam supply margin index of the auxiliary unit.

[0011] The adaptive pulse control module, connected to the cooperative attitude decision module, is used to generate adaptive pulse control commands for the auxiliary unit based on the determined cooperative attitude of the system, and to control the steam inlet valve of the auxiliary unit to execute commands.

[0012] Through the above technical solution, this invention no longer relies on static threshold monitoring and fixed time delay judgment of a single indicator. Instead, the steam supply margin index calculation module constructs a steam supply margin index that can dynamically and proactively reflect the actual steam supply potential of the unit by nonlinearly fusing data from multiple dimensions such as unit load, pressure margin, operating efficiency, and especially the rate of change of the real-time opening of the back pressure turbine inlet steam regulating valve.

[0013] By introducing a factor based on valve change rate, the system can effectively identify the "acceleration" of steam supply demand, that is, distinguish whether the steam supply pressure is in a stable consumption state or is rapidly deteriorating. This allows the system to accurately predict the declining margin trend of the main generating unit before key parameters such as steam supply pressure deviate significantly.

[0014] Based on this, the cooperative attitude decision module can determine the optimal system cooperative attitude according to the combined state of the margin indices of the two units, and the adaptive pulse control module generates quantified control commands that closely match the current requirements. These commands are no longer fixed pulses, but are dynamically calculated based on the margin deficit or balance requirements.

[0015] Preferably, when the steam supply margin index calculation module calculates the steam supply margin index of the main generating unit, the parameters it uses include at least:

[0016] The load factor is calculated based on the current generating load and rated generating load of the main generating units;

[0017] Extraction pressure margin factor is calculated based on the real-time reheat hot section steam pressure of the main unit and the minimum reheat hot section pressure allowed by design under the current load.

[0018] Efficiency zone factors obtained from the efficiency characteristic MAP chart of the main generating units;

[0019] The valve change rate factor is calculated based on the rate of change of the real-time opening of the back pressure turbine steam inlet regulating valve over time.

[0020] Preferably, the steam supply margin index calculation module calculates the valve change rate factor by taking the negative of the first derivative of the real-time opening of the back pressure turbine steam inlet regulating valve with respect to time, so as to predict changes in steam supply demand.

[0021] Preferably, the cooperative attitude decision module is used to map the combined state of the main unit steam supply margin index and the auxiliary unit steam supply margin index to a decision matrix containing multiple system cooperative attitudes, so as to determine the system cooperative attitude to be executed at the current time.

[0022] Preferably, the system cooperative attitude includes:

[0023] Primary cruise attitude: This is decided when the main generator unit's steam supply margin index is at a high level, and is used to maintain the independent operation of the main generator unit.

[0024] Accompanying preheating posture: When the steam supply margin index of the main unit shows a downward trend and the steam supply margin index of the auxiliary unit is at a high level, the decision is made to preheat the steam inlet pipeline of the auxiliary unit in advance.

[0025] Active balancing posture: This is decided when both the steam supply margin index of the main unit and the steam supply margin index of the auxiliary unit are at an intermediate level, and is used to make the two units share the load through flexible adjustment.

[0026] Role Reversal Stance: This decision is made when the steam supply margin index of the main generator unit is at an extremely low level and the steam supply margin index of the auxiliary generator unit is at a high level. It is used to quickly transfer the main steam supply task from the main generator unit to the auxiliary generator unit.

[0027] Preferably, when the collaborative attitude decision module decides to enter the accompanying preheating attitude, its decision-making basis also includes detecting that the rate of change of the main unit steam supply margin index with respect to time is negative.

[0028] Preferably, the adaptive pulse control command generated by the adaptive pulse control module includes a pulse opening increment and a pulse duration, and the values ​​of the pulse opening increment and the pulse duration are dynamically calculated and generated based on the decided system cooperative attitude.

[0029] Preferably, when the system's cooperative attitude is an active balancing attitude, the adaptive pulse control module calculates the pulse opening increment so that its value is proportional to the difference between the steam supply margin index of the main unit and the steam supply margin index of the auxiliary unit.

[0030] Preferably, when the system's cooperative attitude is a role reversal attitude, the adaptive pulse control module calculates the pulse opening increment so that its value is proportional to the deficit of the main unit's steam supply margin index relative to the preset high threshold.

[0031] Secondly, this invention provides the following technical solution: a method for optimizing the parallel operation logic of two back-pressure units of an industrial steam turbine, comprising the following steps:

[0032] Real-time acquisition of operating parameters of main and auxiliary units, as well as the real-time opening of the back pressure turbine inlet steam regulating valve;

[0033] Based on the collected operating parameters and real-time opening, the main unit steam supply margin index, which characterizes the steam supply potential of the main unit, and the auxiliary unit steam supply margin index, which characterizes the steam supply potential of the auxiliary unit, are calculated in parallel. The calculation of the main unit steam supply margin index is based on the valve change rate factor, which characterizes the demand change trend and is determined by the rate of change of real-time opening over time.

[0034] Based on the calculated combined state of the main unit steam supply margin index and the auxiliary unit steam supply margin index, the system's current coordinated posture should be determined.

[0035] Based on the determined system cooperative attitude, an adaptive pulse control command is generated for the auxiliary unit, and the intake valve of the auxiliary unit is controlled to execute the command.

[0036] The present invention has the following beneficial effects:

[0037] 1. In this invention, by introducing a valve change rate factor based on the real-time opening rate of the back pressure steam inlet regulating valve to calculate the change rate over time, the system can identify the changing trend of steam supply demand, thereby initiating control actions before the steam supply pressure deviates significantly, reducing the lag in the control process.

[0038] 2. In this invention, by constructing a steam supply margin index that integrates multiple real-time operating parameters such as load rate, pressure margin, and efficiency zone, the system's decision-making basis can dynamically adapt to the actual operating conditions of the unit, avoiding dependence on fixed empirical parameters.

[0039] 3. In this invention, by establishing a system collaborative attitude decision-making mechanism based on the combined state of the steam supply margin index of the two units, the collaborative control of the two units is realized. It can execute a variety of control strategies, including accompanying preheating and active balancing, according to the overall state of the system, rather than simply treating the auxiliary unit as a passive backup unit. Attached Figure Description

[0040] Figure 1 This is the overall flowchart proposed in this invention;

[0041] Figure 2 This is a structural block diagram of the logic optimization system for parallel operation of dual back-pressure turbines in industrial steam supply, as proposed in this invention.

[0042] Figure 3 This is a schematic diagram of the calculation process for the steam supply margin index of the parallel operation logic optimization system for dual back pressure turbines of industrial steam supply proposed in this invention. Detailed Implementation

[0043] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] Example 1

[0045] Please see the appendix Figure 1 - Appendix Figure 3 In the first embodiment of the present invention, the present invention provides a method for optimizing the logic of parallel operation of two back-pressure units of an industrial steam turbine, comprising the following steps:

[0046] Real-time acquisition of operating parameters of main and auxiliary units, as well as the real-time opening of the back pressure turbine inlet steam regulating valve;

[0047] Based on the collected operating parameters and real-time opening, the main unit steam supply margin index, which characterizes the steam supply potential of the main unit, and the auxiliary unit steam supply margin index, which characterizes the steam supply potential of the auxiliary unit, are calculated in parallel. The calculation of the main unit steam supply margin index is based on the valve change rate factor, which characterizes the demand change trend and is determined by the rate of change of real-time opening over time.

[0048] Based on the calculated combined state of the main unit steam supply margin index and the auxiliary unit steam supply margin index, the system's current coordinated posture should be determined.

[0049] Based on the determined system cooperative attitude, an adaptive pulse control command is generated for the auxiliary unit, and the intake valve of the auxiliary unit is controlled to execute the command.

[0050] Specifically, a set of real-time operating parameters are continuously acquired and standardized through interfaces connected to the data acquisition system (DCS) and field instruments of the main and auxiliary units.

[0051] The collected operating parameters include at least the following: for both main and auxiliary units, the current generating load, rated generating load, real-time reheat steam pressure, and the minimum allowable reheat pressure under the current load, determined based on the unit performance curve. Simultaneously, the real-time opening of the back-compression turbine inlet regulating valve on the associated steam supply pipeline is also collected.

[0052] Perform the steam supply margin index calculation step. In this step, based on the collected parameters, the steam supply margin index is calculated in parallel for both generating units. This index is a dimensionless comprehensive indicator used to quantify the current steam supply potential, safety margin, and operating economy of the generating units. This step specifically includes:

[0053] First, calculate the Steam Supply Margin Index (SSPI) using the following formula:

[0054]

[0055] Wherein, SSPI is the final calculated steam supply margin index; F L For load factor; F M F is the extraction steam pressure margin factor. E F is the efficiency zone factor; R For valve change rate factor; w L ,w M ,w E ,w R The preset weight index for each factor is a dimensionless adjustable parameter.

[0056] Next, calculate each component factor in the above formula.

[0057] Load factor F L Calculated using the following formula:

[0058]

[0059] Among them, P car P represents the current generating load of the unit, in MW; rat The rated generating load of the unit is expressed in MW; α is a preset weighting coefficient used to adjust the degree of load impact, which is a dimensionless adjustable parameter.

[0060] Extraction pressure margin factor F M Calculated using the following formula:

[0061]

[0062] Among them, M p_cur This refers to the real-time pressure of the reheat steam in the hot section, expressed in MPa; M p_min The minimum allowable reheat hot zone pressure under the current load, in MPa; M p_nom This is the rated pressure of the reheat section, expressed in MPa, used for normalizing the pressure margin. When M... p_cur Not greater than M p_min At that time, F M The value is 0.

[0063] Efficiency factor F E This is obtained by querying a pre-set unit efficiency characteristic MAP (Map of Unit Efficiency Characteristics). A MAP is a dataset storing the unit's operating efficiency values ​​under different operating condition combinations. The current operating parameters of the unit (including P) are then used. cur Using (etc.) as input, find the corresponding efficiency evaluation value in the graph; this value is F. E F E The range of values ​​is .

[0064] Valve change rate factor F R Calculated using the following formula:

[0065]

[0066] Among them, V opn The real-time opening degree of the back pressure turbine inlet steam regulating valve is expressed as a percentage. β is the first derivative of the real-time opening degree with respect to time; β is a preset weighting coefficient, a dimensionless adjustable parameter. This factor is only introduced when calculating the steam supply margin index of the main generating units.

[0067] The coordinated attitude decision-making step is executed, in which the calculated steam supply margin index (SSPI) of the main generator unit is used. main ) and auxiliary unit steam supply margin index (SSPI) aux As a two-dimensional state coordinate point, it is compared with a preset decision space to determine the current system cooperative posture that the entire steam supply system should execute.

[0068] The preset decision space consists of two thresholds, T H (High-order threshold) and T L (Low threshold) is divided into different regions, and each region corresponds to a system cooperative posture.

[0069] The specific decision-making logic is as follows:

[0070] When SSPI main >T H At that time, the system's cooperative attitude was determined as the primary cruise attitude.

[0071] When (T) L <SSPI main ≤T H )∧(d(SSPI main ) / dt<0)∧(SSPI aux >T H When ), the system's cooperative attitude is determined to be the accompanying preheating attitude.

[0072] When (T) L <SSPI main ≤T H )∧(T L <SSPI aux ≤T H When ), the system's cooperative attitude is determined to be the active balancing attitude.

[0073] When (SSPI) main ≤T L )∧(SSPI aux >T H When the system's cooperative posture is determined to be the role-reversed posture, the system's cooperative posture is determined to be the role-reversed posture.

[0074] The adaptive pulse control step is executed to convert the determined system cooperative attitude into a specific and executable adaptive pulse control command for the auxiliary unit intake valve. This command includes two parameters: pulse opening increment (ΔV) and pulse duration (Δt).

[0075] Depending on the different system cooperative postures, the instructions are generated in the following ways:

[0076] If the system's cooperative attitude is the primary cruise attitude, then a command is generated and sent to maintain or enter the fully closed state of the auxiliary unit's steam inlet valve, at which point ΔV = 0.

[0077] If the system's cooperative attitude is a preheating attitude, a preset small opening pulse command is generated, for example, ΔV = V. preheat And Δt = t preheat V preheat With t preheat This is a fixed constant used for pipeline preheating.

[0078] If the system's cooperative attitude is an active equalization attitude, then the pulse opening increment is dynamically calculated using the following formula:

[0079] ΔV=K b ·(SSPI main -SSPI aux );

[0080] Among them, K b This is a preset equalization gain coefficient.

[0081] If the system's cooperative attitude is a role reversal attitude, then the pulse opening increment is dynamically calculated using the following formula:

[0082] ΔV=K r ·(T H -SSPI main );

[0083] Among them, K r T is a preset compensation gain coefficient. H The defined high-order threshold.

[0084] The system executes control commands and cycles through the system, sending previously generated commands to the actuators of the auxiliary unit's steam inlet valve to complete one control action. Afterward, the system returns to its initial state and begins the next cycle of calculation and control, thus forming a continuously operating closed-loop control process.

[0085] Example 2:

[0086] Based on Embodiment 1, to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to a specific application scenario. The present invention provides a logic optimization system for parallel operation of dual-unit back-pressure turbines in industrial steam supply, comprising:

[0087] The data acquisition module is used to collect the operating parameters of the main unit and auxiliary unit in real time, as well as the real-time opening of the back pressure turbine steam inlet regulating valve;

[0088] The steam supply margin index calculation module is connected to the data acquisition module. It is used to calculate the main unit steam supply margin index, which represents the steam supply potential of the main unit, and the auxiliary unit steam supply margin index, which represents the steam supply potential of the auxiliary unit, in parallel based on the operating parameters and real-time opening degree.

[0089] The collaborative attitude decision module, connected to the steam supply margin index calculation module, is used to determine the system collaborative attitude that the system should currently execute based on the combined state of the steam supply margin index of the main unit and the steam supply margin index of the auxiliary unit.

[0090] The adaptive pulse control module, connected to the cooperative attitude decision module, is used to generate adaptive pulse control commands for the auxiliary unit based on the determined cooperative attitude of the system, and to control the steam inlet valve of the auxiliary unit to execute commands.

[0091] Referring to a specific application scenario, in an industrial steam supply system, the main generator unit is Unit A, and the auxiliary generator unit is Unit B. Their parallel operation logic optimization system is deployed according to an embodiment of this invention. In the prior art compared to this invention, a fixed low-pressure alarm threshold (e.g., 1.0 MPa) is typically set with a fixed delay (e.g., 180 seconds) to activate the auxiliary generator unit. This approach only responds after a problem occurs, while the embodiment of this invention avoids this problem through forward-looking calculations.

[0092] At an initial steady state at time t0, the main generating unit A is operating stably, and its main operating parameters are: current generating load P cur For 300MW, the real-time steam pressure in the reheat section is M p_cur The pressure is 1.25 MPa. At this time, the back pressure turbine inlet steam regulating valve V... opn With an opening degree of 75% and an opening degree change rate of 0, the system operates smoothly.

[0093] At time t1, downstream user steam demand suddenly increases dramatically. To maintain pipeline pressure, the back-pressure turbine inlet steam regulating valve V of main unit A... opn The system was quickly activated, and at time t2, it collected the following set of key data: For the main generating unit A, the current generating load P cur It is 310MW (its rated load P) rat (350MW), real-time steam pressure M in the reheat section p_cur The minimum allowable pressure M under this load is 1.15 MPa. p_min It is 0.9 MPa, rated pressure M p_nom The efficiency zone factor F corresponding to the current operating condition is 1.3 MPa. E It is 0.92.

[0094] For the back pressure turbine inlet steam regulating valve, its opening V opn The value is 85%, and the rate of change of opening d(V) is calculated during the time period from t1 to t2. opn The steam supply margin index (SSPI) is +1.5% / s. For auxiliary unit B in hot standby mode, its steam supply margin index is calculated to be extremely high, for example, SSPI. main It is 0.98.

[0095] Although the reheat pressure of main unit A at time t2 (1.15 MPa) is still higher than the 1.0 MPa alarm threshold in the prior art, the system of this invention has already begun to perform forward-looking calculations based on the collected data. The system calculates the steam supply margin index (SSPI) of main unit A in parallel. main The weight index of each factor was set to 1, and the weight coefficients α = 1.5 and β = 0.2.

[0096] First, calculate the load factor F. L :

[0097]

[0098] Then, calculate the extraction steam pressure margin factor F. M :

[0099]

[0100] Efficiency factor F E The collected value was used directly, which is 0.92.

[0101] Next, the valve change rate factor F is calculated. R :

[0102] F R =-0.2·(+1.5)=-0.3;

[0103] Finally, the steam supply margin index (SSPI) of the main generator unit A was calculated using a combination of methods. main :SSPI main =(0.265) 1 )·(0.625 1 )·(0.92 1 )·(1+(-0.3)) 1 =0.1656·0.92·0.7≈0.1066 The steam supply margin index (SSPI) of the main unit A was calculated. main After reaching approximately 0.1066, the system compares it with the index of auxiliary unit B and the preset threshold.

[0104] Assuming the high-order threshold T H =0.7, low-order threshold T L =0.25. At this time, SSPI m ain is below the low threshold T L SSPI aux Above the high-order threshold T H This combined state satisfies the trigger condition for the character's reverse posture. In response, the system immediately generates a compensating pulse command for auxiliary unit B. The compensation gain coefficient K is set. r =0.5, and dynamically calculate the pulse opening increment ΔV:

[0105] ΔV=K r ·(T H -SSPI main = 0.5·(0.7-0.1066)≈0.2967;

[0106] The system converts this calculation result into a pulse command of 29.7% opening degree, and attaches a preset pulse duration, and sends it to the intake valve actuator of auxiliary unit B.

[0107] Through the above steps, at time t2, when the actual pressure of the main unit A is far from reaching the 1.0 MPa alarm line, the system of this invention has already predicted, by calculating the rate of change of valve opening, that the steam supply potential of the main unit is being rapidly depleted, and decisively decides to start the auxiliary unit B to provide support. The steam from the auxiliary unit B has been incorporated into the system before the pipeline pressure begins to drop significantly, thereby maintaining the stability of the steam supply pressure and avoiding the control lag problem in the prior art, which requires waiting for the pressure to actually fall below the threshold and then responding after a delay.

[0108] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A logic optimization system for parallel operation of dual-unit back-pressure turbines in industrial steam supply, characterized in that: include: The data acquisition module is used to collect the operating parameters of the main unit and auxiliary unit in real time, as well as the real-time opening of the back pressure turbine steam inlet regulating valve; The steam supply margin index calculation module is connected to the data acquisition module. It is used to calculate the main unit steam supply margin index, which represents the steam supply potential of the main unit, and the auxiliary unit steam supply margin index, which represents the steam supply potential of the auxiliary unit, in parallel based on the operating parameters and real-time opening degree. The collaborative attitude decision module, connected to the steam supply margin index calculation module, is used to determine the system collaborative attitude that the system should currently execute based on the combined state of the steam supply margin index of the main unit and the steam supply margin index of the auxiliary unit. The adaptive pulse control module, connected to the cooperative attitude decision module, is used to generate adaptive pulse control commands for the auxiliary unit based on the determined cooperative attitude of the system, and to control the steam inlet valve of the auxiliary unit to execute commands.

2. The industrial steam turbine dual-unit back-pressure turbine parallel operation logic optimization system according to claim 1, characterized in that, When calculating the steam supply margin index of the main generating unit, the steam supply margin index calculation module uses at least the following parameters: The load factor is calculated based on the current generating load and rated generating load of the main generating units; Extraction pressure margin factor is calculated based on the real-time reheat hot section steam pressure of the main unit and the minimum reheat hot section pressure allowed by design under the current load. Efficiency zone factors obtained from the efficiency characteristic MAP chart of the main generating units; The valve change rate factor is calculated based on the rate of change of the real-time opening of the back pressure turbine steam inlet regulating valve over time.

3. The industrial steam turbine dual-unit back-pressure turbine parallel operation logic optimization system according to claim 2, characterized in that, The steam supply margin index calculation module calculates the valve change rate factor by taking the negative of the first derivative of the real-time opening of the back pressure turbine steam inlet regulating valve with respect to time, so as to predict changes in steam supply demand.

4. The industrial steam turbine dual-unit back-pressure turbine parallel operation logic optimization system according to claim 1, characterized in that, The cooperative attitude decision module is used to map the combined state of the main unit steam supply margin index and the auxiliary unit steam supply margin index to a decision matrix containing multiple system cooperative attitudes, so as to determine the system cooperative attitude to be executed at the current time.

5. The industrial steam turbine dual-unit back-pressure turbine parallel operation logic optimization system according to claim 4, characterized in that, The system cooperative attitude includes: Primary cruise attitude: This is decided when the main generator unit's steam supply margin index is at a high level, and is used to maintain the independent operation of the main generator unit. Accompanying preheating posture: When the steam supply margin index of the main unit shows a downward trend and the steam supply margin index of the auxiliary unit is at a high level, the decision is made to preheat the steam inlet pipeline of the auxiliary unit in advance. Active balancing posture: This is decided when both the steam supply margin index of the main unit and the steam supply margin index of the auxiliary unit are at an intermediate level, and is used to make the two units share the load through flexible adjustment. Role Reversal Stance: This decision is made when the steam supply margin index of the main generator unit is at an extremely low level and the steam supply margin index of the auxiliary generator unit is at a high level. It is used to quickly transfer the main steam supply task from the main generator unit to the auxiliary generator unit.

6. The industrial steam turbine dual-unit back-pressure turbine parallel operation logic optimization system according to claim 5, characterized in that, When the collaborative attitude decision-making module decides to enter the accompanying preheating attitude, its decision-making basis also includes detecting that the rate of change of the main unit steam supply margin index with respect to time is negative.

7. The industrial steam turbine dual-unit back-pressure turbine parallel operation logic optimization system according to claim 1, characterized in that, The adaptive pulse control module generates adaptive pulse control commands including pulse opening increment and pulse duration, and the values ​​of pulse opening increment and pulse duration are dynamically calculated and generated based on the decided system cooperative attitude.

8. The industrial steam turbine dual-unit back-pressure turbine parallel operation logic optimization system according to claim 1, characterized in that, When the system's cooperative attitude is an active equilibrium attitude, the adaptive pulse control module calculates the pulse opening increment so that its value is proportional to the difference between the steam supply margin index of the main unit and the steam supply margin index of the auxiliary unit.

9. The industrial steam turbine dual-unit back-pressure turbine parallel operation logic optimization system according to claim 1, characterized in that, When the system's cooperative attitude is a role reversal attitude, the adaptive pulse control module calculates the pulse opening increment so that its value is proportional to the deficit of the main unit's steam supply margin index relative to the preset high threshold.

10. A method for optimizing the logic of parallel operation of dual-unit back-pressure turbines in industrial steam supply, characterized in that... The logic optimization system for parallel operation of dual-unit back-pressure turbines in industrial steam turbines as described in any one of claims 1-9 includes the following steps: Real-time acquisition of operating parameters of main and auxiliary units, as well as the real-time opening of the back pressure turbine inlet steam regulating valve; Based on the collected operating parameters and real-time opening, the main unit steam supply margin index, which characterizes the steam supply potential of the main unit, and the auxiliary unit steam supply margin index, which characterizes the steam supply potential of the auxiliary unit, are calculated in parallel. The calculation of the main unit steam supply margin index is based on the valve change rate factor, which characterizes the demand change trend and is determined by the rate of change of real-time opening over time. Based on the calculated combined state of the main unit steam supply margin index and the auxiliary unit steam supply margin index, the system's current coordinated posture should be determined. Based on the determined system cooperative attitude, an adaptive pulse control command is generated for the auxiliary unit, and the intake valve of the auxiliary unit is controlled to execute the command.

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