Opening degree control method, device and equipment of medium-low pressure cylinder communication valve and medium

Abstract

The invention provides an opening degree control method, device and equipment for a medium-low pressure cylinder communication valve and a medium, and belongs to the technical field of power plant automatic control. The method comprises the steps that the opening degrees of a small engine control valve and a medium-low pressure cylinder communicating valve are obtained; when the opening degree of the small engine control valve is within the second preset range to the first preset range, the reduction rate of the communication valve is determined; the opening degree of the communication valve is reduced, the opening degree of the small engine control valve is increased to fourth to third preset ranges, and the increasing rate of the communication valve is determined; increasing the opening degree of the communication valve, reducing the opening degree of the control valve until the opening degree of the control valve is within a third preset range to a second preset range, and adjusting the opening degree to a fifth preset opening degree when the opening degree of the communication valve is greater than the second preset range; wherein the third preset opening degree is greater than the fourth preset opening degree, the second preset opening degree is greater than the first preset opening degree, and the fifth preset opening degree is less than the first preset opening degree. The opening degree of the communication valve of the medium-low pressure cylinder is adjusted according to the opening degree of the small engine control valve, stable operation of a unit can be guaranteed, steam flow distribution is optimized, and the working condition adaptability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power plant automatic control, and in particular to a method for controlling the opening of a medium- and low-pressure cylinder connecting valve, a device for controlling the opening of a medium- and low-pressure cylinder connecting valve, an electronic device and a computer-readable storage medium. Background Art

[0002] The historical data of thermal power units is huge and has high data analysis value. However, the process parameters of thermal power units are affected by the actual physical mechanism and have a lot of inertia and delay. In addition, the system coupling in thermal power units is relatively serious. One system may be affected by the operation of multiple other systems at the same time, which brings great difficulties to the operation of operators. In the boiler system, the medium and low pressure cylinder connecting valve is such a parameter affected by multiple other parameters. In the actual operation of the unit, the steam-driven feed water pump replenishes water to the steam drum. Under certain special conditions, the steam-driven feed water pump may have insufficient steam intake and difficulty in supplying water to the steam drum.

[0003] At present, operators generally rely on their own work experience to make judgments and operations, mainly by frequently operating the medium and low-pressure cylinder connecting valves to adjust the steam intake of small machines in response to load changes.

[0004] However, frequent and empirical operations will affect the smooth operation of the unit and greatly shorten the service life of related equipment. Summary of the invention

[0005] The purpose of the embodiments of the present invention is to provide a method, device, equipment and medium for controlling the opening of a medium- and low-pressure cylinder connecting valve to solve the above-mentioned problems.

[0006] In order to achieve the above object, an embodiment of the present invention provides a method for controlling the opening of a medium- and low-pressure cylinder connecting valve, comprising: Obtain the opening of the small engine regulating valve and the opening of the medium and low pressure cylinder connecting valve; When the opening of the small engine regulating valve is greater than the second preset opening and less than the first preset opening, based on the opening of the small engine regulating valve and the opening of the medium and low pressure cylinder connecting valve, determining the reduction rate of the medium and low pressure cylinder connecting valve; Based on the reduction rate of the medium and low pressure cylinder connecting valve, the opening of the medium and low pressure cylinder connecting valve is reduced, so that the opening of the small machine regulating valve is increased synchronously, until the current opening of the small machine regulating valve is greater than the fourth preset opening and less than the third preset opening, and based on the current opening of the small machine regulating valve and the current opening of the medium and low pressure cylinder connecting valve, the increase rate of the medium and low pressure cylinder connecting valve is determined; Based on the increase rate of the medium and low pressure cylinder connecting valve, the opening of the medium and low pressure cylinder connecting valve is increased, so that the opening of the small engine regulating valve is synchronously reduced, until the current opening of the small engine regulating valve is greater than the third preset opening and less than the second preset opening, and the current opening of the medium and low pressure cylinder connecting valve is greater than the second preset opening, the current opening of the medium and low pressure cylinder connecting valve is adjusted to the fifth preset opening; Among them, the fourth preset opening degree is less than the third preset opening degree, less than the second preset opening degree, less than the first preset opening degree, and less than the fifth preset opening degree.

[0007] Optionally, based on the opening of the small engine regulating valve and the opening of the medium and low pressure cylinder connecting valve, determining the reduction rate of the medium and low pressure cylinder connecting valve includes: Based on the opening of the small engine regulating valve, determine the initial reduction rate of the medium and low pressure cylinder connecting valve; Determining a reduction rate threshold of the medium- and low-pressure cylinder connecting valve based on the opening of the medium- and low-pressure cylinder connecting valve; When the opening of the small engine regulating valve and the opening of the medium and low pressure cylinder connecting valve are both greater than the first preset opening and less than the fifth preset opening, the initial reduction rate of the medium and low pressure cylinder connecting valve is used as the reduction rate of the medium and low pressure cylinder connecting valve; When the opening of the small engine regulating valve is greater than the first preset opening and less than the fifth preset opening, and the opening of the medium and low pressure cylinder connecting valve is greater than the fourth preset opening and less than the first preset opening, the reduction rate threshold of the medium and low pressure cylinder connecting valve is used as the reduction rate of the medium and low pressure cylinder connecting valve; When the opening of the small engine regulating valve is greater than the second preset opening and less than the first preset opening, and the opening of the medium and low pressure cylinder connecting valve is greater than the first preset opening and less than the fifth preset opening, the initial reduction rate of the medium and low pressure cylinder connecting valve is used as the reduction rate of the medium and low pressure cylinder connecting valve; When the opening of the small engine regulating valve is greater than the second preset opening and less than the first preset opening, and the opening of the medium and low pressure cylinder connecting valve is greater than the fourth preset opening and less than the first preset opening, the reduction rate threshold of the medium and low pressure cylinder connecting valve is used as the reduction rate of the medium and low pressure cylinder connecting valve.

[0008] Optionally, based on the opening of the small engine regulating valve, determining the initial reduction rate of the medium and low pressure cylinder connecting valve includes: When the opening of the small engine regulating valve is greater than the first preset opening and less than the fifth preset opening, determining the reduction rate of the medium and low pressure cylinder connecting valve to be the first initial reduction rate; When the opening of the small engine regulating valve is greater than the second preset opening and less than the first preset opening, determining the reduction rate of the medium and low pressure cylinder connecting valve as the second initial reduction rate; The second initial decrease rate is less than the first initial decrease rate.

[0009] Optionally, based on the opening of the medium- and low-pressure cylinder connecting valve, determining a reduction rate threshold of the medium- and low-pressure cylinder connecting valve comprises: When the opening of the medium-low pressure cylinder connecting valve is greater than the first preset opening and less than the fifth preset opening, determining the threshold rate of the medium-low pressure cylinder connecting valve to be the first decreasing rate threshold; When the opening of the medium-low pressure cylinder connecting valve is greater than the sixth preset opening and less than the first preset opening, determining the threshold rate of the medium-low pressure cylinder connecting valve to be the second decreasing rate threshold; The second reduction rate threshold is less than the first reduction rate threshold.

[0010] Optionally, based on the current opening of the small engine regulating valve and the current opening of the medium and low pressure cylinder connecting valve, determining the increase rate of the medium and low pressure cylinder connecting valve includes: Based on the current opening of the small engine regulating valve, determine the initial increase rate of the medium and low pressure cylinder connecting valve; Determining an increase rate threshold of the medium- and low-pressure cylinder connecting valve based on the current opening of the medium- and low-pressure cylinder connecting valve; When the current opening of the small engine regulating valve is less than the fourth preset opening, and the current opening of the medium and low pressure cylinder connecting valve is greater than the first preset opening and less than the fifth preset opening, the increase rate threshold of the medium and low pressure cylinder connecting valve is used as the increase rate of the medium and low pressure cylinder connecting valve; When the current opening of the small engine regulating valve is less than the fourth preset opening, and the current opening of the medium and low pressure cylinder connecting valve is greater than the fourth preset opening and less than the first preset opening, the increase rate threshold of the medium and low pressure cylinder connecting valve is used as the increase rate of the medium and low pressure cylinder connecting valve; When the current opening of the small engine regulating valve is less than the third preset opening, and the current opening of the medium and low pressure cylinder connecting valve is greater than the first preset opening and less than the fifth preset opening, the increase rate threshold of the medium and low pressure cylinder connecting valve is used as the increase rate of the medium and low pressure cylinder connecting valve; When the current opening of the small engine regulating valve is less than the third preset opening, and the current opening of the medium and low pressure cylinder connecting valve is greater than the fourth preset opening and less than the first preset opening, the increase rate threshold of the medium and low pressure cylinder connecting valve is used as the increase rate of the medium and low pressure cylinder connecting valve.

[0011] Optionally, based on the current opening of the small engine regulating valve, determining the initial increase rate of the medium and low pressure cylinder connecting valve includes: When the current opening of the small engine regulating valve is less than the fourth preset opening, determining the initial increase rate of the medium and low pressure cylinder connecting valve to be the first initial increase rate; When the current opening of the small engine regulating valve is greater than the fourth preset opening and less than the third preset opening, determining the initial increase rate of the medium and low pressure cylinder connecting valve to be the second initial increase rate; The second initial increase rate is less than the first initial increase rate.

[0012] Optionally, based on the current opening of the medium and low pressure cylinder connecting valve, determining the increase rate threshold of the medium and low pressure cylinder connecting valve includes: When the current opening of the medium- and low-pressure cylinder connecting valve is greater than the first preset opening and less than the fifth preset opening, determining the first increase rate threshold of the medium- and low-pressure cylinder connecting valve as the increase rate threshold of the medium- and low-pressure cylinder connecting valve; When the current opening of the intermediate and low pressure cylinder connecting valve is greater than the sixth preset opening and less than the first preset opening, determining the second increase rate threshold of the intermediate and low pressure cylinder connecting valve as the increase rate threshold of the intermediate and low pressure cylinder connecting valve; Among them, the second increase rate threshold is less than the second increase rate threshold.

[0013] In a second aspect of an embodiment of the present invention, there is provided an opening control device for a medium- and low-pressure cylinder connecting valve, comprising: The opening acquisition module is used to obtain the opening of the small engine regulating valve and the opening of the medium and low pressure cylinder connecting valve; An opening reduction module, used for determining a reduction rate of the medium and low pressure cylinder connecting valve based on the opening of the small engine adjusting valve and the opening of the medium and low pressure cylinder connecting valve when the opening of the small engine adjusting valve is greater than the second preset opening and less than the first preset opening; An opening increasing module, for reducing the opening of the medium-low pressure cylinder connecting valve based on the reduction rate of the medium-low pressure cylinder connecting valve, so as to increase the opening of the small machine regulating valve synchronously, until the current opening of the small machine regulating valve is greater than the fourth preset opening and less than the third preset opening, and determining the increasing rate of the medium-low pressure cylinder connecting valve based on the current opening of the small machine regulating valve and the current opening of the medium-low pressure cylinder connecting valve; an opening execution module, for increasing the opening of the medium-low pressure cylinder connecting valve based on the increase rate of the medium-low pressure cylinder connecting valve, so as to synchronously reduce the opening of the small engine regulating valve, until the current opening of the small engine regulating valve is greater than the third preset opening and less than the second preset opening, and the current opening of the medium-low pressure cylinder connecting valve is greater than the second preset opening, and the current opening of the medium-low pressure cylinder connecting valve is adjusted to the fifth preset opening; Among them, the fourth preset opening degree is less than the third preset opening degree, less than the second preset opening degree, less than the first preset opening degree, and less than the fifth preset opening degree.

[0014] In a third aspect of the embodiments of the present invention, an electronic device is provided, comprising: a processor and a memory, wherein the memory stores machine-readable instructions executable by the processor, and when the machine-readable instructions are executed by the processor, the above-mentioned method for controlling the opening of the medium and low pressure cylinder connecting valves is executed.

[0015] In a fourth aspect of the embodiments of the present invention, a computer-readable storage medium is provided, which stores computer instructions. When the computer instructions are executed on a computer, the computer executes the above-mentioned method for controlling the opening of the medium and low pressure cylinder connecting valves.

[0016] Beneficial effects of the present invention: (1) Realize coordinated control of small machine valves: According to the different opening ranges of the small machine regulating valve, the opening of the medium and low pressure cylinder connecting valve is adjusted in a targeted manner, which in turn prompts the small steam turbine speed control system to make corresponding adjustments to the opening of the small machine regulating valve, so that the steam intake of the small steam turbine can be accurately controlled according to the actual working conditions, ensuring that the small steam turbine can operate stably in a suitable working state and better match the overall power output requirements of the system.

[0017] (2) Optimize the steam flow distribution of medium and low pressure cylinders: By dynamically adjusting the opening of the connecting valve between the medium and low pressure cylinders, the steam flow between the medium and low pressure cylinders can be finely adjusted, so that the steam can be distributed in the medium and low pressure cylinders in a reasonable proportion, avoiding the situation where the local steam flow is too large or too small, maintaining good thermal conditions in the medium and low pressure cylinders, and reducing problems such as abnormal thermal stress inside the cylinder caused by uneven steam flow, which helps to extend the service life of the equipment.

[0018] (3) Improve the ability to adapt to working conditions: When faced with different operating conditions such as changes in power generation load and adjustments in heating demand, this technical solution can help the system quickly and smoothly transition to a new stable operating state by flexibly adjusting the opening of the medium and low pressure cylinder connecting valves, thereby enhancing the system's adaptability to a variety of complex operating conditions.

[0019] (4) Smooth operation of the unit: Through precise control logic, the opening of the medium and low pressure cylinder connecting valve is automatically adjusted based on the opening of the small machine control valve and other parameters, avoiding the randomness and inaccuracy that may be caused by frequent and empirical operations. This can effectively buffer the fluctuations of key parameters such as the medium pressure cylinder exhaust pressure and flow caused by factors such as changes in operating conditions, so that the operating parameters of the entire steam turbine system remain relatively stable, reducing abnormal conditions such as increased unit vibration caused by drastic fluctuations in parameters, thereby ensuring the smooth operation of the unit.

[0020] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings: Figure 1 It is a flow chart of a method for controlling the opening of a medium- and low-pressure cylinder connecting valve provided in an embodiment of the present invention; Figure 2 It is a structural schematic diagram of an opening control device for medium and low pressure cylinder connecting valves provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0024] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0025] Embodiment 1 Please refer to Figure 1 , Figure 1 1 is a flow chart of a method for controlling the opening of a medium- and low-pressure cylinder connecting valve provided in an embodiment of the present invention, the method comprising the following steps: S100, obtaining the opening of the small engine regulating valve and the opening of the medium and low pressure cylinder connecting valve; Small machine refers to small steam turbine, and small machine regulating valve refers to the regulating valve of small steam turbine. Its main function is to control the steam flow entering the small steam turbine. Small steam turbine is usually used to drive feed water pump to provide water for boiler.

[0026] In the structure of steam turbine, the medium and low pressure cylinder connecting valve is a valve installed on the connecting pipe between the medium pressure cylinder exhaust port and the low pressure cylinder inlet port. It is mainly used to balance the steam flow and pressure of the medium and low pressure cylinders under specific working conditions.

[0027] The relationship between the small engine regulating valve and the medium and low pressure cylinder connecting valve: (1) Steam flow correlation: The small unit regulating valve mainly controls the steam flow entering the small steam turbine, and the small steam turbine is usually used to drive the feed water pump. The operating condition of the feed water pump will indirectly affect the steam cycle of the entire unit. The medium and low pressure cylinder connecting valve controls the steam flow distribution between the medium pressure cylinder and the low pressure cylinder. During the operation of the unit, they all play a key role in the reasonable distribution of steam flow.

[0028] For example, when the unit load changes, the small machine control valve will adjust the speed of the feed water pump as needed, which may cause changes in the pressure and flow of the entire steam-water system. This change will affect the working state of the medium and low pressure cylinders of the steam turbine. At this time, the medium and low pressure cylinder connecting valve may need to adjust the opening accordingly to balance the steam flow between the medium and low pressure cylinders to ensure the stable operation of the steam turbine.

[0029] (2) Operational coordination: The two operations are coordinated during unit startup, shutdown, or low-load operation. During the startup phase, the small unit control valve will slowly open according to the boiler's feed water demand to control the speed of the feed water pump. At the same time, the medium and low pressure cylinder connecting valve will also operate according to the steam parameters of the turbine's medium and low pressure cylinders and the requirements for blade protection.

[0030] For example, during cold start, in order to prevent the last stage blades of the intermediate pressure cylinder from overheating, the intermediate and low pressure cylinder connecting valve is opened to allow part of the steam to enter the low pressure cylinder directly. At this time, the action of the small machine regulating valve must be coordinated with it to ensure that the steam generation (through boiler feed water regulation) and steam utilization (through the intermediate and low pressure cylinders of the turbine) of the entire unit are in a balanced state to avoid pressure fluctuations or equipment damage due to unbalanced steam flow.

[0031] (3) Impact on the overall performance of the unit: The small machine regulating valve and the medium and low pressure cylinder connecting valve are closely related and affect each other in the operation of the unit. The small machine regulating valve is responsible for controlling the steam flow entering the small steam turbine to drive the feed water pump. If it cannot accurately control the speed of the feed water pump, it will cause abnormal feed water flow, which will have an adverse effect on the boiler efficiency and steam generation. The medium and low pressure cylinder connecting valve controls the steam flow distribution between the medium pressure cylinder and the low pressure cylinder. Once the steam flow cannot be correctly distributed, the working efficiency of the medium and low pressure cylinder will be reduced, and in severe cases, the blades and other components will be damaged. In the operation of the unit, the cooperation between the two is of great significance. Whether it is the unit start-up, shutdown or low load, variable load operation and other working conditions, they need to cooperate with each other. For example, during variable load operation, the joint adjustment of the small machine regulating valve and the medium and low pressure cylinder connecting valve can not only ensure the normal operation of the feed water pump, but also keep the medium and low pressure cylinders of the steam turbine in an efficient and safe working state, thereby improving the overall economy and reliability of the unit and laying a solid foundation for the stable and efficient operation of the unit.

[0032] In one embodiment, the acquired opening of the small machine regulating valve is the opening of the small machine regulating valve under stable working conditions.

[0033] Among them, the steady-state operating condition is determined in the following way: if the load fluctuation range of the steam turbine unit is less than 5% for at least 5 minutes, and the main steam pressure fluctuation of the steam turbine unit is less than 3%, it is considered to be in a steady-state operating condition.

[0034] In this embodiment, obtaining the opening of the small machine control valve under stable working conditions can improve parameter accuracy and facilitate precise control and optimization.

[0035] S200, when the opening of the small engine regulating valve is greater than the second preset opening and less than the first preset opening, determining a reduction rate of the medium and low pressure cylinder connecting valve based on the opening of the small engine regulating valve and the opening of the medium and low pressure cylinder connecting valve; It should be noted that when the medium and low pressure cylinder connecting valve is not controlled, the medium and low pressure cylinder connecting valve is in a fully open state (i.e. 100%). Therefore, when the opening of the small engine regulating valve is greater than the fourth preset opening and less than the third preset opening, since the opening state of the medium and low pressure cylinder connecting valve is in a fully open state, there is no way to increase its opening, that is to say, the opening control method of the medium and low pressure cylinder connecting valve provided by the present invention can only reduce the opening of the medium and low pressure cylinder connecting valve at the beginning.

[0036] In one embodiment, when the opening of the small machine regulating valve is greater than the second preset opening and less than the first preset opening, the opening of the medium and low pressure cylinder connecting valve can be first reduced to the first preset opening, and then the step of determining the reduction rate of the medium and low pressure cylinder connecting valve based on the opening of the small machine regulating valve and the opening of the medium and low pressure cylinder connecting valve is performed, thereby saving adjustment time.

[0037] In one embodiment, based on the opening of the small engine regulating valve and the opening of the medium and low pressure cylinder connecting valve, determining the reduction rate of the medium and low pressure cylinder connecting valve includes: S210, determining the initial reduction rate of the medium and low pressure cylinder connecting valve based on the opening of the small engine regulating valve; Specifically, step S210 includes: S211, when the opening of the small engine regulating valve is greater than the first preset opening and less than the fifth preset opening, determining the reduction rate of the medium and low pressure cylinder connecting valve to be the first initial reduction rate; S212, when the opening of the small engine regulating valve is greater than the second preset opening and less than the first preset opening, determining the reduction rate of the medium and low pressure cylinder connecting valve to be the second initial reduction rate; The second initial decrease rate is less than the first initial decrease rate.

[0038] S220, determining a reduction rate threshold of the medium- and low-pressure cylinder connecting valve based on the opening of the medium- and low-pressure cylinder connecting valve; Specifically, step S220 includes: S221, when the opening of the medium and low pressure cylinder connecting valve is greater than the first preset opening and less than the fifth preset opening, determining the threshold rate of the medium and low pressure cylinder connecting valve to be the first decreasing rate threshold; S222, when the opening of the medium and low pressure cylinder connecting valve is greater than the sixth preset opening and less than the first preset opening, determining the threshold rate of the medium and low pressure cylinder connecting valve to be the second decreasing rate threshold; The second reduction rate threshold is less than the first reduction rate threshold.

[0039] S230, when the opening of the small engine regulating valve and the opening of the medium and low pressure cylinder connecting valve are both greater than the first preset opening and less than the fifth preset opening, the initial reduction rate of the medium and low pressure cylinder connecting valve is used as the reduction rate of the medium and low pressure cylinder connecting valve; S240, when the opening of the small engine regulating valve is greater than the first preset opening and less than the fifth preset opening, and the opening of the medium and low pressure cylinder connecting valve is greater than the fourth preset opening and less than the first preset opening, the reduction rate threshold of the medium and low pressure cylinder connecting valve is used as the reduction rate of the medium and low pressure cylinder connecting valve; S250, when the opening of the small engine regulating valve is greater than the second preset opening and less than the first preset opening, and the opening of the medium and low pressure cylinder connecting valve is greater than the first preset opening and less than the fifth preset opening, the initial reduction rate of the medium and low pressure cylinder connecting valve is used as the reduction rate of the medium and low pressure cylinder connecting valve; S260, when the opening of the small engine regulating valve is greater than the second preset opening and less than the first preset opening, and the opening of the medium and low pressure cylinder connecting valve is greater than the fourth preset opening and less than the first preset opening, the reduction rate threshold of the medium and low pressure cylinder connecting valve is used as the reduction rate of the medium and low pressure cylinder connecting valve.

[0040] S300, based on the reduction rate of the medium and low pressure cylinder connecting valve, reducing the opening of the medium and low pressure cylinder connecting valve, so as to increase the opening of the small engine regulating valve synchronously, until the current opening of the small engine regulating valve is greater than the fourth preset opening and less than the third preset opening, and determining the increase rate of the medium and low pressure cylinder connecting valve based on the current opening of the small engine regulating valve and the current opening of the medium and low pressure cylinder connecting valve; In one embodiment, based on the reduction rate of the medium- and low-pressure cylinder connecting valve, reducing the opening of the medium- and low-pressure cylinder connecting valve can be achieved in the following manner: ;in, Indicates the opening of the medium and low pressure cylinder connecting valve after reduction, Indicates the opening of the medium and low pressure cylinder connecting valve before reduction. Indicates the reduction rate of the medium and low pressure cylinder connecting valve.

[0041] In one embodiment, based on the current opening of the small engine regulating valve and the current opening of the medium and low pressure cylinder connecting valve, the increasing rate of the medium and low pressure cylinder connecting valve is determined, including: S310, determining the initial increase rate of the medium and low pressure cylinder connecting valve based on the current opening of the small engine regulating valve; Specifically, step S310 includes: S311, when the current opening of the small engine regulating valve is less than the fourth preset opening, determining the initial increase rate of the medium and low pressure cylinder connecting valve to be the first initial increase rate; S312, when the current opening of the small engine regulating valve is greater than the fourth preset opening and less than the third preset opening, determining the initial increase rate of the medium and low pressure cylinder connecting valve to be the second initial increase rate; The second initial increase rate is less than the first initial increase rate.

[0042] S320, determining an increase rate threshold of the medium and low pressure cylinder connecting valve based on the current opening of the medium and low pressure cylinder connecting valve; Specifically, step S320 includes: S321, when the current opening of the intermediate and low pressure cylinder connecting valve is greater than the first preset opening and less than the fifth preset opening, determining the first increase rate threshold of the intermediate and low pressure cylinder connecting valve as the increase rate threshold of the intermediate and low pressure cylinder connecting valve; S322, when the current opening of the intermediate and low pressure cylinder connecting valve is greater than the sixth preset opening and less than the first preset opening, determining the second increase rate threshold of the intermediate and low pressure cylinder connecting valve as the increase rate threshold of the intermediate and low pressure cylinder connecting valve; Among them, the second increase rate threshold is less than the second increase rate threshold.

[0043] S330, when the current opening of the small engine regulating valve is less than the fourth preset opening, and the current opening of the medium and low pressure cylinder connecting valve is greater than the first preset opening and less than the fifth preset opening, the increase rate threshold of the medium and low pressure cylinder connecting valve is used as the increase rate of the medium and low pressure cylinder connecting valve; S340, when the current opening of the small engine regulating valve is less than the fourth preset opening, and the current opening of the medium and low pressure cylinder connecting valve is greater than the fourth preset opening and less than the first preset opening, the increase rate threshold of the medium and low pressure cylinder connecting valve is used as the increase rate of the medium and low pressure cylinder connecting valve; S350, when the current opening of the small engine regulating valve is less than the third preset opening, and the current opening of the medium and low pressure cylinder connecting valve is greater than the first preset opening and less than the fifth preset opening, the increase rate threshold of the medium and low pressure cylinder connecting valve is used as the increase rate of the medium and low pressure cylinder connecting valve; S360, when the current opening of the small engine regulating valve is less than the third preset opening, and the current opening of the medium and low pressure cylinder connecting valve is greater than the fourth preset opening and less than the first preset opening, the increase rate threshold of the medium and low pressure cylinder connecting valve is used as the increase rate of the medium and low pressure cylinder connecting valve.

[0044] S400, based on the increase rate of the medium and low pressure cylinder connecting valve, increase the opening of the medium and low pressure cylinder connecting valve, so as to synchronously reduce the opening of the small engine regulating valve, until the current opening of the small engine regulating valve is greater than the third preset opening and less than the second preset opening, and the current opening of the medium and low pressure cylinder connecting valve is greater than the second preset opening, adjust the current opening of the medium and low pressure cylinder connecting valve to the fifth preset opening; Among them, the fourth preset opening degree is less than the third preset opening degree, less than the second preset opening degree, less than the first preset opening degree, and less than the fifth preset opening degree.

[0045] In one embodiment, based on the increase rate of the medium and low pressure cylinder connecting valve, the opening of the medium and low pressure cylinder connecting valve is increased so that the opening of the small engine regulating valve is synchronously reduced. Specifically, this can be achieved in the following manner: ;in, Indicates the increased opening of the medium and low pressure cylinder connecting valve, Indicates the current opening of the medium and low pressure cylinder connecting valve. Indicates the increase rate of the medium and low pressure cylinder connecting valve.

[0046] It is understandable that if the opening of the small machine regulating valve is greater than the third preset opening and less than the second preset opening, it means that the boiler water level is most stable at this time.

[0047] In one embodiment, the corresponding small unit valve opening interval range under the stable drum water level can be obtained by analyzing the operation history data of the steam turbine unit through data mining.

[0048] For ease of understanding, the following is an example with actual data: First preset opening: 70%; second preset opening: 65%; third preset opening: 55%; fourth preset opening: 50%; fifth preset opening: 100%; first initial decrease rate: 24% / minute; second initial decrease rate: 12% / minute; first decrease rate threshold: 30% / minute; second decrease rate threshold: 6% / minute; first initial increase rate: 24% / minute; second initial increase rate: 12% / minute; second increase rate threshold: 6% / minute; second increase rate threshold: 10% / minute.

[0049] Step 1 (get the opening in the initial state): Assume that the current opening of the small machine regulating valve is 68%, and the opening of the medium and low pressure cylinder connecting valve is 80%.

[0050] Step 2 (determine the reduction rate of the medium and low pressure cylinder connecting valve): (1) Determine the initial reduction rate: Because the opening of the small engine regulating valve 68% is greater than the second preset opening 65% and less than the first preset opening 70%, according to the rule, the reduction rate of the medium and low pressure cylinder connecting valve is determined to be the second initial reduction rate, that is, 12% / minute.

[0051] (2) Determine the reduction rate threshold: The opening of the medium and low pressure cylinder connecting valve is 80%, which is greater than the first preset opening of 70% and less than the fifth preset opening of 100%, so the threshold rate of the medium and low pressure cylinder connecting valve is determined to be the first reduction rate threshold, that is, 30% / minute.

[0052] (3) Comprehensive determination of the reduction rate: Since the opening of the small engine regulating valve is greater than the second preset opening of 65% and less than the first preset opening of 70%, and the opening of the medium and low pressure cylinder connecting valve is greater than the first preset opening of 70% and less than the fifth preset opening of 100%, according to the rule (S250), the initial reduction rate of the medium and low pressure cylinder connecting valve (that is, 12% / minute) is used as the reduction rate of the medium and low pressure cylinder connecting valve.

[0053] Step 3 (Adjusting the opening and subsequent operations based on the reduction rate): Based on the determined reduction rate of 12% / minute of the medium and low pressure cylinder connecting valve, start to reduce the opening of the medium and low pressure cylinder connecting valve, and simultaneously increase the opening of the small machine regulating valve. Continue the operation until the opening of the small machine regulating valve is greater than the fourth preset opening of 50% and less than the third preset opening of 55%. Assuming that after a period of adjustment, the opening of the small machine regulating valve becomes 52%, then enter the link of determining the increase rate of the medium and low pressure cylinder connecting valve.

[0054] (1) Determine the initial increase rate: The current opening of the small engine regulating valve is 52%, which is greater than the fourth preset opening of 50% and less than the third preset opening of 55%, so the initial increase rate of the medium and low pressure cylinder connecting valve is determined to be the second initial increase rate, that is, 12% / minute.

[0055] (2) Determine the increase rate threshold: Assuming that the current opening of the medium and low pressure cylinder connecting valve has become 60% after the previous adjustment, which is greater than the sixth preset opening (not given here, assuming that the corresponding conditions are met) and less than the first preset opening of 70%, the second increase rate threshold of the medium and low pressure cylinder connecting valve is determined to be the increase rate threshold of the medium and low pressure cylinder connecting valve, that is, 6% / minute.

[0056] (3) Comprehensive determination of the increase rate: The current opening of the small engine regulating valve is less than the third preset opening of 55%, and the opening of the medium and low pressure cylinder connecting valve is greater than the sixth preset opening (assuming that the conditions are met) and less than the first preset opening of 70%. According to the rules (corresponding to appropriate rules, such as S360), the increase rate threshold of the medium and low pressure cylinder connecting valve (that is, 6% / minute) is used as the increase rate of the medium and low pressure cylinder connecting valve.

[0057] Step 4 (adjust the opening to the target value based on the increase rate): Based on the determined increase rate of 6% / minute of the medium and low pressure cylinder connecting valve, increase the opening of the medium and low pressure cylinder connecting valve, and simultaneously reduce the opening of the small machine regulating valve. Continue the operation until the current opening of the small machine regulating valve is greater than the third preset opening of 55% and less than the second preset opening of 65%, and the current opening of the medium and low pressure cylinder connecting valve is greater than the second preset opening of 65%, adjust the current opening of the medium and low pressure cylinder connecting valve to the fifth preset opening of 100%, and complete the entire adjustment process.

[0058] In one embodiment, the medium- and low-pressure cylinder connecting valve may be driven by an EH oil pump, thereby reducing or increasing the opening of the medium- and low-pressure cylinder connecting valve.

[0059] The driving conditions of the EH oil pump are as follows: the EH oil pump is started only when the opening of the small engine regulating valve is greater than the first preset opening or greater than the second preset opening and lasts for a certain period of time, and the medium and low pressure cylinder connecting valves can only be driven when the oil pressure of the EH oil pump reaches the preset oil pressure.

[0060] In one embodiment, there are two EH oil pumps, and only one needs to be started before the medium and low pressure cylinder connecting valve is actuated, but the EH oil pump may fail, etc. Therefore, after the EH oil pump is started, it should be automatically put into interlocking start, and after the operating oil pump fails, the standby oil pump should be automatically interlocked and started.

[0061] For ease of understanding, the following is an example with actual data: It is triggered when the opening of the small machine throttle valve reaches 65%. At this time, the opening of the small machine throttle valve still has a certain margin, and the start can be delayed. Therefore, when the opening of the small machine throttle valve is maintained above 65%, the EH oil pump is started after 2 minutes. The second-level starting strategy is triggered when the opening of the small machine throttle valve reaches 70%. At this time, the opening of the small machine throttle valve has basically no margin, and the opening of the action connecting valve needs to be reduced to increase the steam intake of the small machine. Therefore, when the opening of the small machine throttle valve reaches 70%, the EH oil pump is started immediately to prepare for the action of the connecting valve. Since the connecting valve needs oil pressure to maintain its opening before it is actuated, according to data mining, after the EH oil pump is started, the connecting valve is allowed to actuate when the oil pressure is established to 13MPa.

[0062] Beneficial effects of the present invention: (1) Realize coordinated control of small machine valves: According to the different opening ranges of the small machine regulating valve, the opening of the medium and low pressure cylinder connecting valve is adjusted in a targeted manner, which in turn prompts the small steam turbine speed control system to make corresponding adjustments to the opening of the small machine regulating valve, so that the steam intake of the small steam turbine can be accurately controlled according to the actual working conditions, ensuring that the small steam turbine can operate stably in a suitable working state and better match the overall power output requirements of the system.

[0063] (2) Optimize the steam flow distribution of medium and low pressure cylinders: By dynamically adjusting the opening of the connecting valve between the medium and low pressure cylinders, the steam flow between the medium and low pressure cylinders can be finely adjusted, so that the steam can be distributed in the medium and low pressure cylinders in a reasonable proportion, avoiding the situation where the local steam flow is too large or too small, maintaining good thermal conditions in the medium and low pressure cylinders, and reducing problems such as abnormal thermal stress inside the cylinder caused by uneven steam flow, which helps to extend the service life of the equipment.

[0064] (3) Improve the ability to adapt to working conditions: When faced with different operating conditions such as changes in power generation load and adjustments in heating demand, this technical solution can help the system quickly and smoothly transition to a new stable operating state by flexibly adjusting the opening of the medium and low pressure cylinder connecting valves, thereby enhancing the system's adaptability to a variety of complex operating conditions.

[0065] (4) Smooth operation of the unit: Through precise control logic, the opening of the medium and low pressure cylinder connecting valve is automatically adjusted based on the opening of the small machine control valve and other parameters, avoiding the randomness and inaccuracy that may be caused by frequent and empirical operations. This can effectively buffer the fluctuations of key parameters such as the medium pressure cylinder exhaust pressure and flow caused by factors such as changes in operating conditions, so that the operating parameters of the entire steam turbine system remain relatively stable, reducing abnormal conditions such as increased unit vibration caused by drastic fluctuations in parameters, thereby ensuring the smooth operation of the unit.

[0066] Embodiment 2 Based on the same inventive concept, Figure 2 As shown, the embodiment of the present invention further provides an opening control 200 of a medium- and low-pressure cylinder connecting valve, including: The opening acquisition module 210 is used to acquire the opening of the small engine regulating valve and the opening of the medium and low pressure cylinder connecting valve; The opening degree reduction module 220 is used to determine the reduction rate of the medium and low pressure cylinder connecting valve based on the opening degree of the small engine adjusting valve and the opening degree of the medium and low pressure cylinder connecting valve when the opening degree of the small engine adjusting valve is greater than the second preset opening degree and less than the first preset opening degree; The opening increasing module 230 is used to reduce the opening of the medium-low pressure cylinder connecting valve based on the reduction rate of the medium-low pressure cylinder connecting valve, so as to increase the opening of the small engine regulating valve synchronously, until the current opening of the small engine regulating valve is greater than the fourth preset opening and less than the third preset opening, and then determine the increase rate of the medium-low pressure cylinder connecting valve based on the current opening of the small engine regulating valve and the current opening of the medium-low pressure cylinder connecting valve; The opening execution module 240 is used to increase the opening of the medium-low pressure cylinder connecting valve based on the increase rate of the medium-low pressure cylinder connecting valve, so as to synchronously reduce the opening of the small engine regulating valve, until the current opening of the small engine regulating valve is greater than the third preset opening and less than the second preset opening, and the current opening of the medium-low pressure cylinder connecting valve is greater than the second preset opening, and the current opening of the medium-low pressure cylinder connecting valve is adjusted to the fifth preset opening; Among them, the fourth preset opening degree is less than the third preset opening degree, less than the second preset opening degree, less than the first preset opening degree, and less than the fifth preset opening degree.

[0067] It should be understood that the device corresponds to the above-mentioned method embodiment for controlling the opening of the medium and low pressure cylinder connecting valve, and can execute the various steps involved in the above-mentioned method embodiment. The specific functions of the device can be found in the above description, and the detailed description is appropriately omitted here to avoid repetition. The device includes at least one software function module that can be stored in a memory in the form of software or firmware or solidified in the operating system (OS) of the device.

[0068] Embodiment 3 Based on the same inventive concept, an embodiment of the present invention also provides an electronic device, including: a processor and a memory, the memory storing machine-readable instructions executable by the processor, and the machine-readable instructions, when executed by the processor, execute the above-mentioned method for controlling the opening of the medium and low pressure cylinder connecting valves.

[0069] In a typical configuration, an electronic device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0070] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0071] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0072] Embodiment 4 Based on the same inventive concept, an embodiment of the present invention further provides a computer-readable storage medium storing computer instructions. When the computer instructions are executed on a computer, the computer executes the above-mentioned method for controlling the opening of the medium and low pressure cylinder connecting valves.

[0073] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0074] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0075] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0076] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0077] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations.

[0078] In addition, the functional modules in each embodiment of the present application can be integrated together to form an independent part, or each module can exist separately, or two or more modules can be integrated to form an independent part.

[0079] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0080] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A method for controlling the opening of a medium- and low-pressure cylinder connecting valve, characterized in that: include: Obtain the opening of the small engine regulating valve and the opening of the medium and low pressure cylinder connecting valve; When the opening of the small engine regulating valve is greater than the second preset opening and less than the first preset opening, based on the opening of the small engine regulating valve and the opening of the medium and low pressure cylinder connecting valve, determining the reduction rate of the medium and low pressure cylinder connecting valve; Based on the reduction rate of the medium and low pressure cylinder connecting valve, the opening of the medium and low pressure cylinder connecting valve is reduced, so that the opening of the small machine regulating valve is increased synchronously, until the current opening of the small machine regulating valve is greater than the fourth preset opening and less than the third preset opening, and based on the current opening of the small machine regulating valve and the current opening of the medium and low pressure cylinder connecting valve, the increase rate of the medium and low pressure cylinder connecting valve is determined; Based on the increase rate of the medium and low pressure cylinder connecting valve, the opening of the medium and low pressure cylinder connecting valve is increased, so that the opening of the small engine regulating valve is synchronously reduced, until the current opening of the small engine regulating valve is greater than the third preset opening and less than the second preset opening, and the current opening of the medium and low pressure cylinder connecting valve is greater than the second preset opening, the current opening of the medium and low pressure cylinder connecting valve is adjusted to the fifth preset opening; Among them, the fourth preset opening degree is less than the third preset opening degree, less than the second preset opening degree, less than the first preset opening degree, and less than the fifth preset opening degree.

2. The method for controlling the opening of the medium and low pressure cylinder connecting valve according to claim 1, characterized in that: Based on the opening of the small engine regulating valve and the opening of the medium and low pressure cylinder connecting valve, the reduction rate of the medium and low pressure cylinder connecting valve is determined, including: Based on the opening of the small engine regulating valve, determine the initial reduction rate of the medium and low pressure cylinder connecting valve; Determining a reduction rate threshold of the medium- and low-pressure cylinder connecting valve based on the opening of the medium- and low-pressure cylinder connecting valve; When the opening of the small engine regulating valve and the opening of the medium and low pressure cylinder connecting valve are both greater than the first preset opening and less than the fifth preset opening, the initial reduction rate of the medium and low pressure cylinder connecting valve is used as the reduction rate of the medium and low pressure cylinder connecting valve; When the opening of the small engine regulating valve is greater than the first preset opening and less than the fifth preset opening, and the opening of the medium and low pressure cylinder connecting valve is greater than the fourth preset opening and less than the first preset opening, the reduction rate threshold of the medium and low pressure cylinder connecting valve is used as the reduction rate of the medium and low pressure cylinder connecting valve; When the opening of the small engine regulating valve is greater than the second preset opening and less than the first preset opening, and the opening of the medium and low pressure cylinder connecting valve is greater than the first preset opening and less than the fifth preset opening, the initial reduction rate of the medium and low pressure cylinder connecting valve is used as the reduction rate of the medium and low pressure cylinder connecting valve; When the opening of the small engine regulating valve is greater than the second preset opening and less than the first preset opening, and the opening of the medium and low pressure cylinder connecting valve is greater than the fourth preset opening and less than the first preset opening, the reduction rate threshold of the medium and low pressure cylinder connecting valve is used as the reduction rate of the medium and low pressure cylinder connecting valve.

3. The method for controlling the opening of the medium and low pressure cylinder connecting valve according to claim 2, characterized in that: Based on the opening of the small engine regulating valve, determine the initial reduction rate of the medium and low pressure cylinder connecting valve, including: When the opening of the small engine regulating valve is greater than the first preset opening and less than the fifth preset opening, the reduction rate of the medium and low pressure cylinder connecting valve is determined to be the first initial reduction rate; When the opening of the small engine regulating valve is greater than the second preset opening and less than the first preset opening, determining the reduction rate of the medium and low pressure cylinder connecting valve as the second initial reduction rate; The second initial decrease rate is less than the first initial decrease rate.

4. The method for controlling the opening of the medium and low pressure cylinder connecting valve according to claim 2, characterized in that: Determining a reduction rate threshold of the medium- and low-pressure cylinder connecting valve based on the opening of the medium- and low-pressure cylinder connecting valve, including: When the opening of the medium-low pressure cylinder connecting valve is greater than the first preset opening and less than the fifth preset opening, determining the threshold rate of the medium-low pressure cylinder connecting valve to be the first decreasing rate threshold; When the opening of the medium-low pressure cylinder connecting valve is greater than the sixth preset opening and less than the first preset opening, determining the threshold rate of the medium-low pressure cylinder connecting valve to be the second decreasing rate threshold; The second reduction rate threshold is less than the first reduction rate threshold.

5. The method for controlling the opening of the medium and low pressure cylinder connecting valves according to claim 1, characterized in that: Based on the current opening of the small engine regulating valve and the current opening of the medium and low pressure cylinder connecting valve, the increase rate of the medium and low pressure cylinder connecting valve is determined, including: Based on the current opening of the small engine regulating valve, determine the initial increase rate of the medium and low pressure cylinder connecting valve; Determining an increase rate threshold of the medium- and low-pressure cylinder connecting valve based on the current opening of the medium- and low-pressure cylinder connecting valve; When the current opening of the small engine regulating valve is less than the fourth preset opening, and the current opening of the medium and low pressure cylinder connecting valve is greater than the first preset opening and less than the fifth preset opening, the increase rate threshold of the medium and low pressure cylinder connecting valve is used as the increase rate of the medium and low pressure cylinder connecting valve; When the current opening of the small engine regulating valve is less than the fourth preset opening, and the current opening of the medium and low pressure cylinder connecting valve is greater than the fourth preset opening and less than the first preset opening, the increase rate threshold of the medium and low pressure cylinder connecting valve is used as the increase rate of the medium and low pressure cylinder connecting valve; When the current opening of the small engine regulating valve is less than the third preset opening, and the current opening of the medium and low pressure cylinder connecting valve is greater than the first preset opening and less than the fifth preset opening, the increase rate threshold of the medium and low pressure cylinder connecting valve is used as the increase rate of the medium and low pressure cylinder connecting valve; When the current opening of the small engine regulating valve is less than the third preset opening, and the current opening of the medium and low pressure cylinder connecting valve is greater than the fourth preset opening and less than the first preset opening, the increase rate threshold of the medium and low pressure cylinder connecting valve is used as the increase rate of the medium and low pressure cylinder connecting valve.

6. The method for controlling the opening of the medium and low pressure cylinder connecting valves according to claim 5, characterized in that: Based on the current opening of the small engine regulating valve, determine the initial increase rate of the medium and low pressure cylinder connecting valve, including: When the current opening of the small engine regulating valve is less than the fourth preset opening, determining the initial increase rate of the medium and low pressure cylinder connecting valve to be the first initial increase rate; When the current opening of the small engine regulating valve is greater than the fourth preset opening and less than the third preset opening, determining the initial increase rate of the medium and low pressure cylinder connecting valve to be the second initial increase rate; The second initial increase rate is less than the first initial increase rate.

7. The method for controlling the opening of the medium and low pressure cylinder connecting valves according to claim 5, characterized in that: Based on the current opening of the medium and low pressure cylinder connecting valve, the increasing rate threshold of the medium and low pressure cylinder connecting valve is determined, including: When the current opening of the medium- and low-pressure cylinder connecting valve is greater than the first preset opening and less than the fifth preset opening, determining the first increase rate threshold of the medium- and low-pressure cylinder connecting valve as the increase rate threshold of the medium- and low-pressure cylinder connecting valve; When the current opening of the intermediate and low pressure cylinder connecting valve is greater than the sixth preset opening and less than the first preset opening, determining the second increase rate threshold of the intermediate and low pressure cylinder connecting valve as the increase rate threshold of the intermediate and low pressure cylinder connecting valve; Among them, the second increase rate threshold is less than the second increase rate threshold.

8. An opening control device for a medium- and low-pressure cylinder connecting valve, characterized in that: include: The opening acquisition module is used to obtain the opening of the small engine regulating valve and the opening of the medium and low pressure cylinder connecting valve; An opening reduction module, used for determining a reduction rate of the medium and low pressure cylinder connecting valve based on the opening of the small engine adjusting valve and the opening of the medium and low pressure cylinder connecting valve when the opening of the small engine adjusting valve is greater than the second preset opening and less than the first preset opening; An opening increasing module, for reducing the opening of the medium-low pressure cylinder connecting valve based on the reduction rate of the medium-low pressure cylinder connecting valve, so as to increase the opening of the small machine regulating valve synchronously, until the current opening of the small machine regulating valve is greater than the fourth preset opening and less than the third preset opening, and determining the increasing rate of the medium-low pressure cylinder connecting valve based on the current opening of the small machine regulating valve and the current opening of the medium-low pressure cylinder connecting valve; an opening execution module, for increasing the opening of the medium-low pressure cylinder connecting valve based on the increase rate of the medium-low pressure cylinder connecting valve, so as to synchronously reduce the opening of the small engine regulating valve, until the current opening of the small engine regulating valve is greater than the third preset opening and less than the second preset opening, and the current opening of the medium-low pressure cylinder connecting valve is greater than the second preset opening, and the current opening of the medium-low pressure cylinder connecting valve is adjusted to the fifth preset opening; Among them, the fourth preset opening degree is less than the third preset opening degree, less than the second preset opening degree, less than the first preset opening degree, and less than the fifth preset opening degree.

9. An electronic device, characterized in that: include: A processor and a memory, wherein the memory stores machine-readable instructions executable by the processor, and when the machine-readable instructions are executed by the processor, the method for controlling the opening of the medium- and low-pressure cylinder connecting valves described in any one of claims 1-7 is executed.

10. A computer-readable storage medium storing computer instructions, characterized in that: When the computer instructions are executed on a computer, the computer is enabled to execute the method for controlling the opening of the medium- and low-pressure cylinder connecting valves according to any one of claims 1 to 7.

Images