Method for controlling the rotational speed of an expansion generator

Abstract

The application provides a rotating speed control method of an expansion generator, and relates to the technical field of expansion generators. The rotating speed control method of the expansion generator comprises the following steps: obtaining the real-time rotating speed of the generator; in the case that it is determined that the real-time rotating speed does not meet the preset rotating speed condition, adopting an expansion machine adjustment strategy to control the output power of the expansion machine until the real-time rotating speed meets the preset rotating speed condition; the expansion machine adjustment strategy at least comprises one of the following: an expansion machine air inlet adjustment strategy, an expansion machine air outlet adjustment strategy and an expansion machine impeller adjustment strategy. Through the adjustment of the expansion machine air inlet, air outlet, impeller and related parameters, the rotating speed can be effectively controlled comprehensively, so that the expansion generator can still operate safely and stably when the compressed air energy storage system has a large amplitude working condition change.

Description

Technical Field

[0001] This invention relates to the field of expander generator technology, and more specifically, to a method for controlling the speed of an expander generator. Background Technology

[0002] With the rapid development of renewable energy, energy storage technology is playing an increasingly important role in power systems. Compressed air energy storage, due to its advantages such as large scale, fast response speed, and long cycle time, has attracted widespread attention in power systems. A multi-stage expansion power generation system of a non-combustion-type compressed air energy storage system consists of an expander, generator, heat exchanger, and corresponding pipelines. During variable operating conditions, the accumulation of harmful energy may lead to a rapid increase in generator speed, resulting in overspeed. To prevent equipment damage caused by excessive generator speed and to improve the unit's operating performance, it is generally necessary to configure an efficient and reliable overspeed prevention system and formulate appropriate overspeed control strategies.

[0003] The prior art discloses a compressed air energy storage load shedding and overspeed prevention system, method and quick-closing valve. By setting an emergency discharge pipe and an exhaust quick-closing valve at the exhaust end of each multi-stage expander, when the generator stops, the exhaust quick-closing valve is quickly closed, the pressurized air in the expander, heat exchanger and pipeline system stops flowing, the expander does no work, and the expander overspeed accident is effectively prevented.

[0004] Current overspeed control methods employ relatively simple control strategies, such as increasing the damping force of the expander impeller and reducing the output power of the expander through jetting, thereby reducing the generator speed. However, this may result in situations where the speed cannot be completely controlled within a safe range.

[0005] There is currently no effective solution to the aforementioned technical problems. Summary of the Invention

[0006] The main objective of this invention is to provide a method for controlling the speed of an expansion generator, so as to solve the problem of excessive generator speed caused by the accumulation of harmful energy in the prior art.

[0007] To achieve the above objectives, according to one aspect of the present invention, a method for controlling the speed of an expander generator is provided, comprising: acquiring the real-time speed of the generator; and, when it is determined that the real-time speed does not meet a preset speed condition, using an expander adjustment strategy to control the output power of the expander until the real-time speed meets the preset speed condition; the expander adjustment strategy includes at least one of the following: an expander intake adjustment strategy, an expander exhaust adjustment strategy, and an expander impeller adjustment strategy, wherein the expander intake adjustment strategy is at least used to adjust the intake volume of the expander, the expander exhaust adjustment strategy is at least used to adjust the exhaust volume of the expander, and the expander impeller adjustment strategy is at least used to adjust the damping force of the expander impeller.

[0008] Furthermore, the expander regulation strategy includes an expander intake regulation strategy, an expander exhaust regulation strategy, and an expander impeller regulation strategy. Among these, the expander intake regulation strategy has a higher priority than the expander impeller regulation strategy, and the expander impeller regulation strategy has a higher priority than the expander exhaust regulation strategy.

[0009] Furthermore, the expansioner output power is adjusted by adopting an expansioner intake regulation strategy, including the following steps: adjusting the first opening of the intake regulating valve to adjust the intake volume of the expansioner, thereby adjusting the output power of the expansioner; wherein, the intake regulating valve is used to regulate the flow rate of the first flow channel, one end of the first flow channel is connected to the air supply system, and the other end of the first flow channel is connected to the main air inlet of the expansioner.

[0010] Furthermore, the expansion compressor output power is adjusted using an expansion compressor intake regulation strategy, which also includes the following steps: adjusting the second opening of the heat flow regulating valve to keep the expansion compressor intake temperature constant; wherein, the heat flow regulating valve is used to regulate the flow rate of the second flow channel, the second flow channel is connected to the heat exchange fluid inlet of the expansion compressor's heat exchanger, the heat exchanger's air inlet is connected to the air supply system through the first flow channel, the heat exchanger's air outlet is connected to the expansion compressor's main air inlet through the third flow channel, and the gas in the first flow channel and the heat exchange fluid in the second flow channel exchange heat in the heat exchanger before entering the expansion compressor's main air inlet through the third flow channel.

[0011] Furthermore, the expansion impeller adjustment strategy is used to adjust the output power of the expander, including the following steps: adjusting the third opening of the second regulating valve to adjust the damping force generated by the jet generator on the expander impeller, thereby adjusting the output power of the expander; wherein, the second regulating valve is used to adjust the flow rate of the seventh flow channel, and the seventh flow channel is used to provide airflow to the jet generator.

[0012] Furthermore, the expansion exhaust regulation strategy is adopted to regulate the output power of the expansion machine, including the following steps: opening the exhaust valve and adjusting the fourth opening degree of the first regulating valve to regulate the exhaust volume of the expansion machine, thereby regulating the output power of the expansion machine; wherein, the exhaust valve is used to control the opening and closing of the exhaust passage of the expansion machine, and the first regulating valve is used to regulate the exhaust volume of the expansion machine.

[0013] Furthermore, when it is determined that the real-time speed does not meet the preset speed condition, an expander adjustment strategy is adopted to adjust the expander's output power until the real-time speed meets the preset speed condition. This includes the following steps: when it is determined that the real-time speed does not meet the preset speed condition, an expander intake adjustment strategy is adopted to adjust the expander's output power; when it is determined that the expander is in the intake limit state and the real-time speed does not meet the preset speed condition, an expander impeller adjustment strategy is adopted to adjust the expander's output power; when it is determined that the expander impeller is in the damping force limit state and the real-time speed does not meet the preset speed condition, an expander exhaust adjustment strategy is adopted to adjust the expander's output power; when it is determined that the expander is in the exhaust limit state and the real-time speed does not meet the preset speed condition, an expander exhaust adjustment strategy is adopted to adjust the expander's output power until the real-time speed meets the preset speed condition.

[0014] Furthermore, when the expander is in the intake limit state, the first opening degree is within the first preset opening degree range, and / or, the second opening degree is within the second preset opening degree range.

[0015] Furthermore, when the expander impeller is in the damping force limit state, the third opening is within the third preset opening range.

[0016] Furthermore, when the expander is in the exhaust limit state, the fourth opening is within the fourth preset opening range.

[0017] By applying the technical solution of this invention, the real-time speed of the generator is obtained. If the real-time speed does not meet the preset speed conditions, an expander regulation strategy is used to control the output power of the expander until the real-time speed meets the preset speed conditions. The expander regulation strategy includes at least one of the following: an expander intake regulation strategy, an expander exhaust regulation strategy, and an expander impeller regulation strategy. The expander intake regulation strategy is used to adjust the expander's intake volume at least once, the expander exhaust regulation strategy is used to adjust the expander's exhaust volume at least once, and the expander impeller regulation strategy is used to adjust the damping force of the expander impeller at least once. By adjusting the expander's intake, exhaust, impeller, and related parameters, the speed can be effectively controlled comprehensively, ensuring that the expander generator can still operate safely and stably when the compressed air energy storage system experiences significant changes in operating conditions. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0019] Figure 1 A flowchart of a first embodiment of the speed control method for an expander generator according to the present invention is shown;

[0020] Figure 2 A schematic diagram of an embodiment of the speed control system of the expander generator according to the present invention is shown;

[0021] Figure 3 A flowchart illustrating a second embodiment of the speed control method for an expander generator according to the present invention is shown.

[0022] The above figures include the following reference numerals:

[0023] 1. First flow channel; 2. Second flow channel; 3. Third flow channel; 4. Fourth flow channel; 5. Fifth flow channel; 6. Sixth flow channel; 7. Seventh flow channel; 8. First regulating valve; 9. Second regulating valve; 10. Inlet regulating valve; 11. Heat exchanger; 12. Heat flow regulating valve; 13. Exhaust valve. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0026] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0027] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and therefore their description will be omitted.

[0028] Combination Figure 1 As shown, according to a specific embodiment of this application, a speed control method for an expander generator is provided. Specifically, the speed control method for the expander generator includes the following steps:

[0029] Step S10: Obtain the real-time speed of the generator;

[0030] Specifically, the real-time speed of the generator mainly includes the speed when the operating conditions of the generator set change and the speed when the generator is stopped.

[0031] Step S12: If it is determined that the real-time speed does not meet the preset speed condition, the expansion machine adjustment strategy is used to control the output power of the expansion machine until the real-time speed meets the preset speed condition.

[0032] Specifically, the preset speed is the speed at which the generator and expander can maintain safe operation under various operating conditions when the generator unit is running under different operating conditions. When the real-time speed of the generator measured by the sensor does not meet the preset speed condition, the expander is controlled to adjust the output power to adjust the real-time speed to a safe speed.

[0033] The expander adjustment strategy includes at least one of the following: expander intake adjustment strategy, expander exhaust adjustment strategy and expander impeller adjustment strategy. The expander intake adjustment strategy is used to adjust the expander intake volume at least, the expander exhaust adjustment strategy is used to adjust the expander exhaust volume at least, and the expander impeller adjustment strategy is used to adjust the expander impeller damping force at least.

[0034] Specifically, the expander intake regulation strategy can control and reduce the expander intake volume and intake temperature, while the expander impeller regulation strategy can control and increase the expander impeller damping force. Furthermore, the expander intake regulation strategy, expander exhaust regulation strategy, and expander impeller regulation strategy are used together to control the speed.

[0035] By applying the technical solution of this embodiment, the real-time speed of the generator is obtained. If the real-time speed does not meet the preset speed conditions, an expander regulation strategy is used to control the output power of the expander until the real-time speed meets the preset speed conditions. The expander regulation strategy includes at least one of the following: an expander intake regulation strategy, an expander exhaust regulation strategy, and an expander impeller regulation strategy. The expander intake regulation strategy is used to adjust the expander's intake volume at least once, the expander exhaust regulation strategy is used to adjust the expander's exhaust volume at least once, and the expander impeller regulation strategy is used to adjust the damping force of the expander impeller at least once. By adjusting the expander's intake, exhaust, impeller, and related parameters, the speed can be effectively controlled comprehensively, ensuring that the expander generator can still operate safely and stably when the compressed air energy storage system experiences significant changes in operating conditions.

[0036] Optionally, the expander regulation strategy includes an expander intake regulation strategy, an expander exhaust regulation strategy, and an expander impeller regulation strategy. The expander intake regulation strategy has a higher priority than the expander impeller regulation strategy, and the expander impeller regulation strategy has a higher priority than the expander exhaust regulation strategy. By setting the priority of different strategies, strategies with less impact on the equipment and greater effect on speed control can be prioritized for regulation, effectively protecting the equipment, extending its service life, and maintaining stable equipment operation.

[0037] It should be noted that the expansioner inlet regulation strategy, expander impeller regulation strategy, and expander exhaust regulation strategy are arranged in the following priority order. The principle is as follows: Expander inlet regulation is the fastest way to change the expander's operating conditions. By reducing the inlet air volume, the expander's output power can be directly reduced, which can quickly reduce the generator speed and minimize the loss of overall energy storage system efficiency. Expander impeller damping force regulation can further reduce the expander's output power and has an additional speed control effect, but increasing the impeller damping force will increase mechanical losses and have a certain impact on system efficiency. The exhaust regulation strategy reduces the air flow in the expander by opening the exhaust valve, which will directly lead to working fluid loss and significantly reduce the overall system efficiency. Therefore, adopting the above priority order can minimize the negative impact on system efficiency while ensuring equipment safety. Gradually increasing the regulation intensity according to the above priority order can ensure speed control with minimal loss of system efficiency.

[0038] Optionally, in step S12, the expander's output power is adjusted using an expander intake regulation strategy, including the following steps:

[0039] Step S121: Adjust the first opening of the intake regulating valve to adjust the intake volume of the expander, thereby adjusting the output power of the expander;

[0040] Specifically, based on the real-time speed of the generator, an intake regulation strategy is generated. The opening of the intake regulating valve is increased to allow high-pressure gas from the gas storage system to enter the expander. The gas does work in the expander, increasing the output power of the expander. Alternatively, the opening of the intake regulating valve is decreased to reduce the output power of the expander, so that the expander controls the generator speed to reach the preset speed condition.

[0041] Among them, such as Figure 2 As shown, Figure 2 This is a schematic diagram of the speed control system for an expander generator. The intake regulating valve 10 is used to regulate the flow rate of the first flow channel 1. One end of the first flow channel 1 is connected to the air supply system, and the other end is connected to the main air inlet of the expander. The intake regulating valve 10 can adjust the amount of air entering the first flow channel 1 from the air storage system, thereby regulating the amount of air ultimately entering the expander. By precisely controlling the expander's air intake through the expander intake regulation strategy, the expander's output power can be effectively adjusted, ensuring that the expander operates at optimal pressure, thus improving energy conversion efficiency and preventing equipment damage due to sudden changes in air supply pressure.

[0042] Optionally, in step S121, adjusting the expander's output power using an expander intake regulation strategy further includes the following steps:

[0043] Step S1211: Adjust the second opening of the heat flow regulating valve to keep the inlet temperature of the expander constant;

[0044] Specifically, the expander intake regulation strategy can simultaneously control the volume and temperature of the high-pressure gas entering the expander. Simply reducing the intake volume may lower the intake temperature, which in turn increases the expander's efficiency. By adjusting the heat flow regulating valve to maintain a constant intake temperature, it can be ensured that the expander's efficiency remains at a relatively constant level when the speed is adjusted.

[0045] Among them, such as Figure 2 As shown, the heat flow regulating valve 12 is used to regulate the flow rate of the second flow channel 2. The second flow channel 2 is connected to the heat exchange fluid inlet of the heat exchanger 11 of the expander. The air inlet of the heat exchanger 11 is connected to the gas supply system through the first flow channel 1, and the air outlet of the heat exchanger 11 is connected to the main air inlet of the expander through the third flow channel 3. After the gas in the first flow channel 1 and the heat exchange fluid in the second flow channel 2 exchange heat in the heat exchanger 11, it enters the main air inlet of the expander through the third flow channel 3. By controlling the inlet temperature through the heat exchanger 11, the performance fluctuation of the expander caused by temperature changes can be avoided. By adopting the heat flow regulation strategy, the inlet temperature can be adjusted in a timely manner according to the actual temperature fluctuation, ensuring that the expander operates at a constant and suitable temperature, thereby improving the energy conversion efficiency.

[0046] Optionally, in step S12, the output power of the expander is adjusted using an expander impeller adjustment strategy, including the following steps:

[0047] Step S122: Adjust the third opening of the second regulating valve to adjust the damping force generated by the jet generator on the expander impeller, thereby adjusting the output power of the expander;

[0048] Specifically, the jet generator sprays high-pressure, high-temperature gas at high speed directly onto the blades of the expander impeller. By directly hydrodynamic damping and changing the fluid dynamic characteristics in the impeller flow channel, it increases the impeller backflow and turbulence, generating additional friction. Adjusting the third opening of the second regulating valve 9 can adjust the opening and state of the jet generator to regulate the gas flow rate, pressure, and velocity, thereby adjusting the magnitude of the impeller damping force.

[0049] The second regulating valve 9 is used to regulate the flow rate of the seventh flow channel 7, which in turn supplies airflow to the jet generator. By adjusting the speed of the expander through the jet generator, the output power of the expander can be adjusted without changing the intake air volume, ensuring that the equipment can operate safely and stably under abnormal conditions.

[0050] Optionally, in step S12, the output power of the expander is adjusted using an expander exhaust regulation strategy, including the following steps:

[0051] Step S123: Open the exhaust valve and adjust the fourth opening of the first regulating valve to adjust the exhaust volume of the expander, thereby adjusting the output power of the expander;

[0052] Specifically, the first regulating valve 8 is connected to the exhaust valve through the fourth flow channel 4. By controlling the fourth opening degree of the first regulating valve 8 and opening the exhaust valve 13, the gas in the flow channel can be discharged, thereby reducing the pressure of the entire system and adjusting the output power of the expanding agent.

[0053] Among them, such as Figure 2 As shown, exhaust valve 13 is used to control the opening and closing of the expander's exhaust passage, and the first regulating valve 8 is used to regulate the expander's exhaust volume. The method of adjusting the expander's output power through an expander exhaust regulation strategy can adjust the expander's output power without affecting the intake system. However, since the adjustment is based on the overall system pressure to achieve the expansioner's output power, it reduces the overall system efficiency. Therefore, the expander exhaust regulation strategy is suitable for environments with large fluctuations in exhaust system pressure. By adjusting the exhaust volume in a timely manner according to changes in exhaust pressure, the expander's output power can be stabilized.

[0054] Optionally, in step S12, if it is determined that the real-time speed does not meet the preset speed condition, an expander adjustment strategy is adopted to adjust the output power of the expander until the real-time speed meets the preset speed condition, including the following steps:

[0055] Step S124: If the real-time speed does not meet the preset speed conditions, the output power of the expander is adjusted by the expander intake regulation strategy;

[0056] Specifically, based on the expander adjustment strategy, which prioritizes the expander intake adjustment strategy over the expander impeller adjustment strategy, when the real-time speed of the generator does not meet the preset speed conditions, the expander intake adjustment strategy is used first, so that the generator speed can reach the preset speed conditions after adjustment by the expander intake adjustment strategy.

[0057] Step S125: When it is determined that the expander is in the intake limit state and the real-time speed does not meet the preset speed conditions, the output power of the expander is adjusted by the expander impeller adjustment strategy.

[0058] Specifically, based on the principle that the expander intake regulation strategy has a higher priority than the expander impeller regulation strategy, and the expander impeller regulation strategy has a higher priority than the expander exhaust regulation strategy, when the generator speed cannot be adjusted by the expander intake regulation strategy alone, the expander impeller regulation strategy is adopted. The aim is to adjust the generator speed to the preset speed condition by combining the expander intake regulation strategy and the expander impeller regulation strategy.

[0059] Step S126: When it is determined that the expander impeller is in the damping force limit state and the real-time speed does not meet the preset speed conditions, the expander exhaust regulation strategy is used to regulate the output power of the expander.

[0060] Specifically, based on the expander impeller adjustment strategy having a higher priority than the expander exhaust adjustment strategy, when the generator speed cannot be adjusted by the expander intake adjustment strategy and the expander impeller adjustment strategy, the expander exhaust adjustment strategy is adopted. The aim is to adjust the generator speed to the preset speed condition by using a comprehensive strategy of multiple adjustment strategies, including the expander intake adjustment strategy, the expander impeller adjustment strategy, and the expander exhaust adjustment strategy.

[0061] Step S127: When it is determined that the expander is in the exhaust limit state and the real-time speed does not meet the preset speed condition, the output power of the expander is adjusted by the expander exhaust adjustment strategy until the real-time speed meets the preset speed condition.

[0062] Specifically, if the generator speed cannot be reached by the combined adjustment strategy of multiple adjustment strategies, such as expander intake adjustment strategy, expander impeller adjustment strategy, and expander exhaust adjustment strategy, the expander exhaust adjustment strategy is used to reduce the pressure of the system and adjust the output power of the expander until the real-time speed of the generator meets the preset speed condition, thereby achieving the effect of controlling the generator speed.

[0063] It should be noted that the graded adjustment strategy can flexibly select the most suitable adjustment method according to the deviation between the real-time speed and the preset speed conditions, ensuring the accuracy and efficiency of speed control. It is applicable to highly automated and intelligent energy conversion systems. Through intelligent analysis and graded response, it can improve energy conversion efficiency, reduce energy waste, and ensure stable equipment operation.

[0064] Optionally, in step S125, when the expander is in the intake limit state, the first opening is within a first preset opening range, and / or, the second opening is within a second preset opening range. Setting a certain preset range or threshold for the first opening of the intake regulating valve 10 and the second opening of the heat flow regulating valve 12 ensures that even when the expander is in the intake limit state, neither the first nor the second opening exceeds the opening threshold. This avoids over-adjustment of the intake regulating valve 10 and the heat flow regulating valve 12, preventing equipment overload or damage. It also ensures the continuity and efficiency of energy recovery and reserves space for subsequent adjustments in a graded adjustment strategy, achieving high-precision adjustment.

[0065] Optionally, in step S126, when the expander impeller is in the damping force limit state, the third opening is within the third preset opening range. Setting the third opening of the second regulating valve 9 to a certain preset range or threshold ensures that even when the expander impeller is in the damping force limit state, the third opening will not exceed the opening threshold, thus avoiding over-adjustment of the impeller regulating valve and preventing abnormal operation of the jet generator. This is applicable to situations requiring precise control of the impeller damping force, protecting the impeller regulating valve, ensuring the refinement and efficiency of energy conversion, and reserving space for subsequent adjustments in a graded adjustment strategy to achieve high-precision adjustment.

[0066] Optionally, in step S127, when the expander is in the exhaust limit state, the fourth opening is within the fourth preset opening range. By setting a certain preset range or threshold for the fourth opening of the first regulating valve 8, even when the expander is in the exhaust limit state, the fourth opening will not exceed the opening threshold, so as to avoid the first regulating valve 8 or the exhaust valve 13 being in an over-open state, releasing the pressure in the system, and also avoiding overload or damage to the exhaust system.

[0067] The control logic and judgment method in this embodiment are as follows:

[0068] First, adjust the opening of the intake regulating valve 10 and the heat flow regulating valve 12 to ensure that the intake temperature remains basically unchanged, thereby reducing the air flow of the expander, reducing the output power of the expander, and thus reducing the generator speed. Second, adjust the opening of the second regulating valve 9 to increase the damping force of the expander impeller, reduce the output power of the expander, and thus reduce the generator speed. Finally, open the exhaust valve 13 and adjust the opening of the first regulating valve 8 to further reduce the air flow of the expander, reduce the output power of the expander, and thus reduce the generator speed.

[0069] Through the above steps, it can be seen that this embodiment can produce the following technical effects: by combining the control strategies of the three overspeed adjustment methods and adopting graded and gradual adjustment, it can ensure that the expander generator can operate safely and stably when the compressed air energy storage system undergoes large changes in operating conditions; by setting the expander exhaust adjustment strategy as the third step, i.e. the last step, in the graded control strategy, it can reduce the waste of working fluid and improve the overall efficiency of the system.

[0070] This application also provides a preferred embodiment of a speed control method for an expander generator, combined with... Figure 3 As shown, the specific control steps and principles of the speed control method for the expander generator in this embodiment are as follows:

[0071] Step 1: Detect the real-time speed V of the expander generator using a speed detection device. rtrs And transmit the data to the speed control module;

[0072] Step 2: The speed control module calculates the real-time speed V. rtrs With the speed set value V spsv The difference V spdv1 If V spdv1 Greater than the speed difference setting value V spdsv Then the speed control module detects the opening degree O of the intake regulating valve 10. tpcv The opening degree of heat flow regulating valve 12 is O hpcv The opening degree of the first regulating valve 8 is O twcv1 The opening degree O of the second regulating valve 9 twcv2 and the on / off state of exhaust valve 13. vvsc ;

[0073] Step 3: Based on V spdv1 Reduce the opening of the intake regulating valve 10. tpcv and the opening degree O of the heat flow regulating valve 12 hpcv To ensure that the gas temperature in the third flow channel 3 remains essentially constant, and to maintain the operation for a given time T. sp1 Detecting real-time rotational speed V rtrs ;

[0074] Step 4: The speed control module calculates the real-time speed V. rtrsWith the speed set value V spsv The difference V spdv2 If V spdv2 Less than the speed difference setting value V spdsv If not in an overspeed state, stop speed regulation; otherwise, check for O. tpcv and O hpcv If O tpcv The minimum setpoint O of the intake regulating valve 10 opening is less than or equal to the setpoint value. tpcv0 Or O hpcv The minimum setpoint O of the opening degree of the heat flow regulating valve 12 is less than or equal to the setpoint value. hpcv0 If not, proceed to step five; otherwise, continue monitoring the real-time rotational speed V. rtrs Proceed to step three;

[0075] Step 5: Based on V spdv2 Reduce the opening of the second regulating valve 9. twcv2 O tpcv and O hpcv Keep it unchanged, maintain the running time T. sp2 Detecting real-time rotational speed V rtrs ;

[0076] Step Six: The speed control module calculates the real-time speed V. rtrs With the speed set value V spsv The difference V spdv3 If V spdv3 Less than the speed difference setting value V spdsv If not in an overspeed state, stop speed regulation; otherwise, check for O. twcv2 If O twcv2 The minimum setpoint O of the opening degree of the second regulating valve 9 is less than or equal to the setpoint O. twcv20 If not, proceed to step seven; otherwise, continue monitoring the real-time rotational speed V. rtrs Proceed to step five;

[0077] Step 7: Based on V spdsv3 Open the switch O of exhaust valve 13 vvsc And reduce the opening degree O of the first regulating valve 8. twcv1 Maintain operation for a given time T sp3 Detecting real-time rotational speed V rtrs ;

[0078] Step 8: The speed control module calculates the real-time speed V. rtrs With the speed set value V spsv The difference V spdv4 If V spdv4 Less than the speed difference setting value V spdsv If not in an overspeed state, stop speed regulation; otherwise, check for O. twcv1 If O twcv1The minimum setpoint O of the opening degree of the first regulating valve 8 is less than or equal to the setpoint O. twcv10 If not, proceed to step nine; otherwise, continue monitoring the real-time rotational speed V. rtrs Proceed to step seven;

[0079] Step Nine: Place O tpcv0 and O hpcv0 Set all values ​​to zero, and reduce the opening of intake regulating valve 10 by O. tpcv and the opening degree O of the heat flow regulating valve 12 hpcv until the detected real-time rotational speed V rtrs Less than the set speed V spsv , restore O tpcv0 and O hpcv0 The initial set value is used to close the exhaust valve 13, and the opening degree O of the first regulating valve 8 is gradually increased. twcv1 The opening degree of the second regulating valve 9 is O twcv2 The opening degree of intake regulating valve 10 is O tpcv and the opening degree O of the heat flow regulating valve 12 hpcv Continue to monitor the real-time rotational speed V rtrs End speed adjustment.

[0080] This application also provides a preferred embodiment of a speed control system for an expander motor, with a specific structure combined with... Figure 2 As shown.

[0081] Specifically, the speed detection transducer in the speed control system of the expander motor continuously detects the real-time speed of the expander generator during operation and transmits it to the speed control module. The speed control module receives the real-time speed signal, detects the opening degree of the regulating valve and the switch of the exhaust valve 13, and issues regulating valve commands and exhaust valve 13 switch commands. The regulating valves include the intake regulating valve 10, the heat flow regulating valve 12, the first regulating valve 8 and the second regulating valve 9. The speed control module detects the opening degree of the regulating valve and the switch status of the exhaust valve 13 only when the expander generator overspeeds.

[0082] The gas in the third channel 3 is formed by the compressed air in the first channel 1 being heated by the hot flow in the second channel 2 through the heat exchanger; the sixth channel 6 is connected to the main air inlet of the expander, and the seventh channel 7 is connected to the diffuser chamber and forms high-speed, high-pressure gas through the jet generator, which acts on the expander impeller blades to generate damping force.

[0083] Based on the flow characteristics of the intake regulating valve 10 and the heat flow regulating valve 12, the adjustment ratio of the opening of the intake regulating valve 10 and the opening of the heat flow regulating valve 12 is set to ensure that the gas temperature in the third flow channel 3 remains basically constant; the exhaust valve 13 is in an open or closed state, and the exhaust flow is controlled by the first regulating valve 8; the minimum setpoint value of the regulating valve opening is determined according to the adjustment requirements and site conditions, and is maintained for a given operating time T. sp1 Tsp2 and T sp3 Determined based on overspeed and adjustment requirements.

[0084] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0085] In addition to the above, it should be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this invention.

[0086] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0087] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method of controlling the rotational speed of an expansion generator, characterized by, The method comprises the following steps: acquiring a real-time rotating speed of the generator; in a case where the real-time rotating speed does not meet a preset rotating speed condition, adopting an expander adjustment strategy to control an output power of the expander until the real-time rotating speed meets the preset rotating speed condition; the expander adjustment strategy at least comprises one of an expander inlet adjustment strategy, an expander outlet adjustment strategy and an expander impeller adjustment strategy, wherein the expander inlet adjustment strategy is at least used to adjust an inlet flow of the expander, the expander outlet adjustment strategy is at least used to adjust an outlet flow of the expander, and the expander impeller adjustment strategy is at least used to adjust a damping force of the expeller impeller; the expander adjustment strategy comprises the expander inlet adjustment strategy, the expander outlet adjustment strategy and the expander impeller adjustment strategy, wherein a priority of the expander inlet adjustment strategy is higher than a priority of the expander impeller adjustment strategy, and the priority of the expander impeller adjustment strategy is higher than a priority of the expander outlet adjustment strategy.

2. The method of claim 1, wherein, adopting the expander inlet adjustment strategy to adjust the output power of the expander comprises the following steps: adjusting a first opening degree of an inlet adjustment valve to adjust the inlet flow of the expander, so as to adjust the output power of the expander; wherein the inlet adjustment valve is used to adjust a flow of a first flow channel (1), one end of the first flow channel (1) is communicated with a gas supply system, and the other end of the first flow channel (1) is communicated with a main inlet of the expander.

3. The method of claim 2, wherein, adopting the expander inlet adjustment strategy to adjust the output power of the expander further comprises the following steps: adjusting a second opening degree of a heat flow adjustment valve to keep the inlet temperature of the expander unchanged; wherein the heat flow adjustment valve is used to adjust a flow of a second flow channel (2), the second flow channel (2) is communicated with a heat exchange fluid inlet of a heat exchanger of the expander, an inlet of the heat exchanger is communicated with the gas supply system through a first flow channel (1), an outlet of the heat exchanger is communicated with the main inlet of the expander through a third flow channel (3), and the gas in the first flow channel (1) and the heat exchange fluid in the second flow channel (2) are heated in the heat exchanger and then enter the main inlet of the expander through the third flow channel (3).

4. The method of claim 3, wherein, adopting the expander impeller adjustment strategy to adjust the output power of the expander comprises the following steps: adjusting a third opening degree of a second adjustment valve to adjust a damping force of a jet flow generator to the expeller impeller, so as to adjust the output power of the expander; wherein the second adjustment valve is used to adjust a flow of a seventh flow channel (7), and the seventh flow channel (7) is used to provide air flow to the jet flow generator.

5. The method of claim 4, wherein, adopting the expander outlet adjustment strategy to adjust the output power of the expander comprises the following steps: opening an outlet valve and adjusting a fourth opening degree of a first adjustment valve to adjust an outlet flow of the expander, so as to adjust the output power of the expander; wherein the outlet valve is used to control opening and closing of an outlet passage of the expander, and the first adjustment valve is used to adjust the outlet flow of the expander.

6. The method of claim 5, wherein, In a case where it is determined that the real-time rotating speed does not meet the preset rotating speed condition, an expander regulating strategy is adopted to regulate the output power of the expander until the real-time rotating speed meets the preset rotating speed condition, comprising the following steps: In a case where it is determined that the real-time rotating speed does not meet the preset rotating speed condition, the expander inlet regulating strategy is adopted to regulate the output power of the expander; In a case where it is determined that the expander is in the inlet limit state and the real-time rotating speed does not meet the preset rotating speed condition, the expander impeller regulating strategy is adopted to regulate the output power of the expander; In a case where it is determined that the expander impeller is in the damping force limit state and the real-time rotating speed does not meet the preset rotating speed condition, the expander exhaust regulating strategy is adopted to regulate the output power of the expander; In a case where it is determined that the expander is in the exhaust limit state and the real-time rotating speed does not meet the preset rotating speed condition, the expander exhaust regulating strategy is adopted to regulate the output power of the expander until the real-time rotating speed meets the preset rotating speed condition.

7. The method of claim 6, wherein, When the expander is in the inlet limit state, the first opening degree is in a first preset opening degree range, and / or the second opening degree is in a second preset opening degree range.

8. The method of claim 6, wherein, When the expander impeller is in the damping force limit state, the third opening degree is in a third preset opening degree range.

9. The method of claim 6, wherein, When the expander is in the exhaust limit state, the fourth opening degree is in a fourth preset opening degree range.

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