Rotating speed control method of expansion generator

Abstract

The invention provides a rotating speed control method of an expansion generator, and relates to the technical field of expansion generators. The rotation speed control method of the expansion generator comprises the steps of obtaining the real-time rotation speed of the generator; under the condition that it is determined that the real-time rotating speed does not meet the preset rotating speed condition, the output power of the expansion machine is controlled through an expansion machine adjusting strategy till the real-time rotating speed meets the preset rotating speed condition; the expansion machine adjusting strategy at least comprises one of an expansion machine air inlet adjusting strategy, an expansion machine exhaust adjusting strategy and an expansion machine impeller adjusting strategy. According to the technical scheme, the rotating speed can be comprehensively and effectively controlled by adjusting air inlet, air exhaust, the impeller and related parameters of the expansion machine, so that when the working condition of the compressed air energy storage system is greatly changed, the expansion generator can still safely and stably run.

Description

Technical Field

[0001] The present invention relates to the technical field of expansion generators, and in particular to a rotation speed control method of an expansion generator. Background Art

[0002] With the rapid development of renewable energy, energy storage technology is becoming increasingly important in power systems. Compressed air energy storage has attracted widespread attention in power systems due to its advantages of large scale, fast response speed, and long cycle. The multi-stage expansion power generation system of the non-supplementary compressed air energy storage system consists of an expander, a generator, a heat exchanger, and corresponding pipelines. During the variable operating conditions of the unit, the accumulation of harmful energy may cause the speed to soar and overspeed. In order to prevent the generator speed from soaring and causing equipment damage and improve the operating performance of the unit, it is generally necessary to configure an efficient and reliable anti-overspeed system and formulate a suitable anti-overspeed control strategy.

[0003] The prior art discloses a compressed air energy storage load rejection and overspeed prevention system, method and quick-closing valve. By arranging 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, and the pressurized air in the expander, heat exchanger and pipeline system stops flowing, the expander stops working, and the expander overspeed accident is effectively prevented.

[0004] The current anti-overspeed control method adopts a relatively simple control strategy. For example, the damping force of the expander impeller is increased by jet, the output power of the expander is reduced, and then the generator speed is reduced. However, it may be impossible to completely control the speed within a safe range.

[0005] Currently, no effective solution has been proposed for the above-mentioned technical problems. Summary of the invention

[0006] The main purpose of the present invention is to provide a method for controlling the rotation speed of an expansion generator, so as to solve the problem in the prior art that harmful energy accumulation causes the rotation speed of the generator to soar.

[0007] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided a method for controlling the speed of an expander generator, comprising: obtaining the real-time speed of the generator; when it is determined that the real-time speed does not meet the 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 comprises 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 air intake regulation strategy, an expander exhaust regulation strategy and an expander impeller regulation strategy, wherein the priority of the expander air intake regulation strategy is higher than the priority of the expander impeller regulation strategy, and the priority of the expander impeller regulation strategy is higher than the priority of the expander exhaust regulation strategy.

[0009] Furthermore, an expander air intake regulation strategy is adopted to regulate the output power of the expander, comprising the following steps: adjusting a first opening of an air intake regulating valve to regulate the air intake amount of the expander, thereby regulating the output power of the expander; wherein the air intake regulating valve is used to regulate the flow rate of a first flow channel, one end of the first flow channel is connected to an air supply system, and the other end of the first flow channel is connected to a main air inlet of the expander.

[0010] Furthermore, the output power of the expander is regulated by adopting the expander intake regulation strategy, which also includes the following steps: regulating the second opening of the heat flow regulating valve to maintain the intake temperature of the expander unchanged; wherein the heat flow regulating valve is used to regulate the flow of the second flow channel, the second flow channel is connected to the heat exchange fluid inlet of the heat exchanger of the expander, the air inlet of the heat exchanger is connected to the air supply system through the first flow channel, the air outlet of the heat exchanger is connected to the main air inlet of the expander 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 and then enter the main air inlet of the expander through the third flow channel.

[0011] Furthermore, an expander 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 of the seventh flow channel, and the seventh flow channel is used to provide airflow to the jet generator.

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

[0013] Further, 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 output power of the expander until the real-time speed meets the preset speed condition, including 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 output power of the expander; when it is determined that the expander is in an 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 output power of the expander; when it is determined that the expander impeller is in a 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 output power of the expander; when it is determined that the expander is in an 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 output power of the expander until the real-time speed meets the preset speed condition.

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

[0015] Further, when the expander impeller is in a damping force limit state, the third opening degree is in a third preset opening degree range.

[0016] Further, when the expander is in the exhaust limit state, the fourth opening degree is in a fourth preset opening degree range.

[0017] The technical solution of the present invention is applied to obtain the real-time speed of the generator; when it is determined that the real-time speed does not meet the preset speed condition, the expander adjustment strategy is used 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: expander air intake adjustment strategy, expander exhaust adjustment strategy and expander impeller adjustment strategy, wherein the expander air intake adjustment strategy is at least used to adjust the air 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. By adjusting the expander intake, exhaust, impeller and related parameters, the speed can be effectively controlled in an integrated manner, so that when the compressed air energy storage system undergoes a large-scale operating condition change, the expansion generator can still operate safely and stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 A flow chart showing a first embodiment of a method for controlling the rotation speed of an expansion generator according to the present invention;

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

[0021] Figure 3 A flow chart of a second embodiment of a method for controlling the rotation speed of an expansion generator according to the present invention is shown.

[0022] The above drawings 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. Intake regulating valve; 11. Heat exchanger; 12. Heat flow regulating valve; 13. Exhaust valve. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates 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 and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0027] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of the layers and regions may be enlarged, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

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

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

[0030] Specifically, the real-time speed of the generator mainly includes the speed when the operating condition of the generator set changes and the speed when the generator is shut down.

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

[0032] Specifically, the preset speed is the speed at which the motor and expander can maintain safe operation under various operating conditions when the generator set operates under variable operating conditions. When the sensor measures that the real-time speed of the generator does not meet the preset speed condition, the expander is controlled to adjust the output power and adjust the real-time speed to a safe speed.

[0033] Among them, the expander adjustment strategy includes at least one of the following: an expander air intake adjustment strategy, an expander exhaust adjustment strategy and an expander impeller adjustment strategy. The expander air intake adjustment strategy is at least used to adjust the air 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.

[0034] Specifically, the expander air intake regulation strategy can control the reduction of the expander air intake volume and the air intake temperature, the expander impeller regulation strategy can control the increase of the expander impeller damping force, and the expander air intake regulation strategy, the expander exhaust regulation strategy, and the expander impeller regulation strategy are used in combination to control the rotation speed.

[0035] The technical solution of this embodiment is applied to obtain the real-time speed of the generator; when it is determined that the real-time speed does not meet the preset speed condition, the expander adjustment strategy is used 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: expander intake adjustment strategy, expander exhaust adjustment strategy and 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. By adjusting the expander intake, exhaust, impeller and related parameters, the speed can be effectively controlled in an integrated manner, so that when the compressed air energy storage system undergoes a large change in working conditions, the expansion generator can still operate safely and stably.

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

[0037] It should be noted that the strategies are arranged in the order of priority of the expander intake adjustment strategy, the expander impeller adjustment strategy, and the expander exhaust adjustment strategy. The principle is as follows: the expander intake adjustment is the fastest way to change the expander working condition. By reducing the intake volume, the output power of the expander can be directly reduced, the generator speed can be quickly reduced, and the loss of the overall efficiency of the energy storage system is minimized; the expander impeller damping force adjustment can further reduce the output power of the expander, and the speed has an additional control effect, but increasing the impeller damping force will increase mechanical loss and have a certain impact on the system efficiency; and the exhaust adjustment strategy will directly lead to the loss of working fluid by opening the exhaust valve to reduce the air flow in the expander, significantly reducing the overall efficiency of the system. Therefore, the above priority order can be adopted to minimize the negative impact on the system efficiency while ensuring the safety of the equipment. Gradually increasing the adjustment force according to the above priority order can ensure that the speed is controlled with the minimum loss of system efficiency.

[0038] Optionally, in step S12, the output power of the expander is adjusted by adopting the expander air intake adjustment strategy, including the following steps:

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

[0040] Specifically, according to the real-time speed of the generator, an air intake regulation strategy is generated to increase the opening of the air intake regulating valve so that the high-pressure gas in the gas storage system enters the expander, and the gas does work in the expander to increase the output power of the expander, or the opening of the air intake regulating valve is reduced 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, Figure 2 As shown, Figure 2 The schematic diagram of the structure of the speed control system of the expansion generator is shown in FIG. The air intake regulating valve 10 is used to adjust the flow 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 of the first flow channel 1 is connected to the main air inlet of the expander. The air intake regulating valve 10 can adjust the air intake amount of the air storage system entering the first flow channel 1, and then adjust the air intake amount finally entering the expander. The air intake amount of the expander is accurately controlled through the expander air intake regulation strategy, which can effectively adjust the output power of the expander and ensure that the expander operates at the optimal pressure, thereby improving the energy conversion efficiency, and at the same time avoiding equipment damage caused by sudden changes in the air supply pressure.

[0042] Optionally, in step S121, the output power of the expander is adjusted by adopting the expander air intake adjustment strategy, and the following steps are also included:

[0043] Step S1211: adjusting the second opening of the heat flow regulating valve to keep the intake air temperature of the expander unchanged;

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

[0045] Among them, Figure 2 As shown, the heat flow regulating valve 12 is used to regulate the flow 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 air supply system through the first flow channel 1. 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 are heat exchanged in the heat exchanger 11, they enter the main air inlet of the expander through the third flow channel 3. By controlling the intake 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 intake temperature can be adjusted in time according to the actual temperature fluctuation to ensure that the expander runs at a constant and appropriate temperature, thereby improving the energy conversion efficiency.

[0046] Optionally, in step S12, the output power of the expander is adjusted by adopting the expander impeller adjustment strategy, comprising the following steps:

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

[0048] Specifically, high-pressure, high-temperature gas is ejected at high speed through the jet generator to directly act on the blades of the expander impeller. Additional friction is generated by increasing impeller reflux and turbulence through direct fluid dynamic damping and changing the fluid dynamic characteristics in the impeller flow channel. Adjusting the third opening of the second regulating valve 9 can adjust the opening and shape of the jet generator to adjust the flow, pressure and speed of the gas, and then adjust the magnitude of the impeller damping force.

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

[0050] Optionally, in step S12, the output power of the expander is adjusted by adopting the expander exhaust adjustment strategy, including the following steps:

[0051] Step S123: opening the exhaust valve and adjusting 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 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 expansion agent.

[0053] Among them, Figure 2 As shown, the exhaust valve 13 is used to control the opening and closing of the exhaust passage of the expander, and the first regulating valve 8 is used to adjust the exhaust volume of the expander. The method of adjusting the output power of the expander by the exhaust regulation strategy of the expander can adjust the output power of the expander without affecting the intake system. However, since the entire system pressure is regulated to achieve the regulation of the output power of the expander, the overall efficiency of the system will be reduced. Therefore, the exhaust regulation strategy of the expander can be applied to environments with large changes in the exhaust system pressure. According to the changes in the exhaust pressure, the exhaust volume is adjusted in time to achieve the effect of stabilizing the output power of the expander.

[0054] Optionally, in step S12, 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 output power of the expander until the real-time speed meets the preset speed condition, including the following steps:

[0055] Step S124: when it is determined that the real-time speed does not meet the preset speed condition, the output power of the expander is adjusted by adopting the expander air intake adjustment strategy;

[0056] Specifically, according to the expander regulation strategy in which the priority of the expander air intake regulation strategy is higher than the priority of the expander impeller regulation strategy, when the real-time speed of the generator does not meet the preset speed condition, the expander air intake regulation strategy is preferentially adopted, so that the speed of the generator reaches the preset speed condition after adjustment through the expander air intake regulation 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 condition, the output power of the expander is adjusted using the expander impeller adjustment strategy;

[0058] Specifically, according to the expander regulation strategy that the priority of the expander air intake regulation strategy is higher than the priority of the expander impeller regulation strategy, and the priority of the expander impeller regulation strategy is higher than the priority of the expander exhaust regulation strategy, when the generator speed cannot be adjusted only by the expander air intake regulation strategy, the expander impeller regulation strategy is adopted, so that the generator speed reaches the preset speed condition after adjustment through the comprehensive strategy of the expander air intake regulation strategy and the expander impeller regulation strategy.

[0059] Step S126: when it is determined that the expander impeller is in a damping force limit state and the real-time speed does not meet the preset speed condition, the output power of the expander is adjusted using the expander exhaust adjustment strategy;

[0060] Specifically, according to the expander regulation strategy in which the priority of the expander impeller regulation strategy is higher than the priority of the expander exhaust regulation strategy, when the generator speed cannot be regulated by the expander air intake regulation strategy and the expander impeller regulation strategy, the expander exhaust regulation strategy is adopted, in order to make the generator speed reach the preset speed condition after regulation through the comprehensive strategy of multiple regulation strategies such as the expander air intake regulation strategy, the expander impeller regulation strategy and the expander exhaust regulation 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 expander exhaust adjustment strategy is adopted to adjust the output power of the expander until the real-time speed meets the preset speed condition.

[0062] Specifically, when the combined adjustment of multiple adjustment strategies including the expander air intake adjustment strategy, the expander impeller adjustment strategy, and the expander exhaust adjustment strategy still cannot satisfy the condition that the generator speed reaches the preset speed, the expander exhaust adjustment strategy will continue to be used to decompress the system and then adjust the output power of the expander until the real-time speed of the generator meets the preset speed condition, thereby achieving the control effect of the generator speed.

[0063] It should be noted that the hierarchical adjustment strategy can flexibly select the most appropriate 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 can be applied to energy conversion systems with highly automated and intelligent control. Through intelligent analysis and hierarchical response, it can improve energy conversion efficiency, reduce energy waste and ensure stable operation of equipment.

[0064] Optionally, in step S125, when the expander is in the intake limit state, the first opening is in the first preset opening range, and / or the second opening is in the second preset opening range. The first opening of the intake regulating valve 10 and the second opening of the heat flow regulating valve 12 are set to a certain preset range or threshold value, so that even when the expander is in the intake limit state, the first opening and the second opening do not exceed the opening threshold value, so as to avoid over-adjustment of the intake regulating valve 10 and the heat flow regulating valve 12, avoid overload or damage of the equipment, and ensure the continuity and efficiency of energy recovery at the same time, and also reserve space for subsequent adjustment for the adjustment strategy of graded adjustment to achieve high-precision adjustment.

[0065] Optionally, in step S126, when the expander impeller is in the damping force limit state, the third opening is in the third preset opening range. The third opening of the second regulating valve 9 is set to a certain preset range or threshold, so that even when the expander impeller is in the damping force limit state, the third opening does not exceed the opening threshold, so as to avoid over-adjustment of the impeller regulating valve and prevent abnormal operation of the jet generator. It can be applied to situations where precise control of the impeller damping force is required, protect the impeller regulating valve, ensure the refinement and efficiency of energy conversion, and also reserve space for subsequent adjustment for the hierarchical 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 in the fourth preset opening range. The fourth opening of the first regulating valve 8 is set to a certain preset range or threshold value, so that even when the expander is in the exhaust limit state, the fourth opening does not exceed the opening threshold value, so as to avoid the first regulating valve 8 or the exhaust valve 13 being in an over-open state, release the pressure in the system, and avoid 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 air intake regulating valve 10 and the opening of the heat flow regulating valve 12 to ensure that the air intake temperature remains basically unchanged, reduce the gas flow of the expander, reduce the output power of the expander, and then reduce the generator speed; secondly, 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 then reduce the generator speed; finally, open the exhaust valve 13 and adjust the opening of the first regulating valve 8 to further reduce the gas flow of the expander, reduce the output power of the expander, and then reduce the generator speed.

[0069] Through the above steps, it can be seen that the present embodiment can produce the following technical effects: by integrating the control strategies of the three overspeed regulation methods and adopting graded and step-by-step regulation, it is ensured that the expansion generator can also operate safely and stably when the operating conditions of the compressed air energy storage system change significantly; the expander exhaust regulation strategy is set as the third step in the graded control strategy, that is, the last step, which can reduce the waste of working fluid and improve the overall efficiency of the system.

[0070] The present application also provides a preferred embodiment of a method for controlling the rotation speed of an expansion generator, Figure 3 As shown, the specific control steps and principles of the speed control method of the expansion generator in this embodiment are as follows:

[0071] Step 1: Detect the real-time speed V of the expansion generator through the 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 and speed setting value V spsv The difference V spdv1 , if V spdv1 Greater than the speed difference setting value V spdsv , the speed control module detects the opening of the intake regulating valve 10 tpcv , the opening degree of the heat flow regulating valve 12 is O hpcv , the opening degree O of the first regulating valve 8 twcv1 and the opening degree O of the second regulating valve 9 twcv2 and the switch state O of the exhaust valve 13 vvsc ;

[0073] Step 3: According to 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 basically unchanged, and to maintain the operation for a given time T sp1 , detect the real-time speed V rtrs ;

[0074] Step 4: The speed control module calculates the real-time speed V rtrsand speed setting value V spsv The difference V spdv2 , if V spdv2 Less than the speed difference setting value V spdsv , non-overspeed state, end speed regulation, otherwise detect O tpcv and O hpcv , if O tpcv Less than or equal to the minimum opening value O of the intake regulating valve 10 tpcv0 or hpcv Less than or equal to the minimum given value O of the opening of the heat flow regulating valve 12 hpcv0 , jump to step 5; otherwise, continue to detect the real-time speed V rtrs , jump to step 3;

[0075] Step 5: According to V spdv2 Reduce the opening of the second regulating valve 9 twcv2 , O tpcv and O hpcv No change, keep running for a given time T sp2 , detect the real-time speed V rtrs ;

[0076] Step 6: The speed control module calculates the real-time speed V rtrs and speed setting value V spsv The difference V spdv3 , if V spdv3 Less than the speed difference setting value V spdsv , non-overspeed state, end speed regulation, otherwise detect O twcv2 , if O twcv2 Less than or equal to the minimum given value O of the opening of the second regulating valve 9 twcv20 , jump to step 7; otherwise, continue to detect the real-time speed V rtrs , jump to step 5;

[0077] Step 7: According to V spdsv3 Open the switch O of the exhaust valve 13 vvsc , and reduce the opening of the first regulating valve 8 twcv1 , keep running for a given time T sp3 , detect the real-time speed V rtrs ;

[0078] Step 8: The speed control module calculates the real-time speed V rtrs and speed setting value V spsv The difference V spdv4 , if V spdv4 Less than the speed difference setting value V spdsv , non-overspeed state, end speed regulation, otherwise detect O twcv1 , if O twcv1Less than or equal to the minimum given value O of the opening of the first regulating valve 8 twcv10 , jump to step nine; otherwise, continue to detect the real-time speed V rtrs , jump to step 7;

[0079] Step 9: O tpcv0 and O hpcv0 Set them to zero, reduce the opening of the intake regulating valve 10 tpcv and the opening degree O of the heat flow regulating valve 12 hpcv Until the real-time speed V is detected rtrs Less than the speed setting value V spsv , restore O tpcv0 and O hpcv0 The exhaust valve 13 is closed, and the opening 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 the intake regulating valve 10 is O tpcv and the opening degree O of the heat flow regulating valve 12 hpcv , continue to detect the real-time speed V rtrs , end the speed adjustment.

[0080] The present application also provides a preferred embodiment of a speed control system of an expansion motor, the specific structure of which is combined with Figure 2 shown.

[0081] Specifically, the speed detection device in the speed control system of the expansion motor always detects the real-time speed of the expansion generator during the operation of the expansion generator, and transmits it to the speed control module. The speed control module receives the real-time speed signal, detects the opening of the regulating valve and the switch status of the exhaust valve 13, and issues a regulating valve instruction and an exhaust valve 13 switch instruction. The regulating valve includes an intake regulating valve 10, a heat flow regulating valve 12, a first regulating valve 8 and a second regulating valve 9. The speed control module detects the opening of the regulating valve and the switch status of the exhaust valve 13 when the expansion generator is overspeeding.

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

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

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

[0085] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present invention.

[0086] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0087] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for controlling the rotation speed of an expansion generator, characterized in that: include: Get the real-time speed of the generator; When it is determined that the real-time speed does not meet the preset speed condition, the expander adjustment strategy is used to control the output power of the expander until the real-time speed meets the preset speed condition; The expander regulation strategy includes at least one of the following: an expander air intake regulation strategy, an expander exhaust regulation strategy and an expander impeller regulation strategy, wherein the expander air intake regulation strategy is at least used to adjust the air intake volume of the expander, the expander exhaust regulation strategy is at least used to adjust the exhaust volume of the expander, and the expander impeller regulation strategy is at least used to adjust the damping force of the expander impeller.

2. The method according to claim 1, characterized in that The expander regulation strategy includes the expander air intake regulation strategy, the expander exhaust regulation strategy and the expander impeller regulation strategy, wherein the priority of the expander air intake regulation strategy is higher than the priority of the expander impeller regulation strategy, and the priority of the expander impeller regulation strategy is higher than the priority of the expander exhaust regulation strategy.

3. The method according to claim 1, characterized in that The expander air intake regulation strategy is used to regulate the output power of the expander, comprising the following steps: Adjusting a first opening of the air intake regulating valve to adjust the air intake amount of the expander, thereby adjusting the output power of the expander; The air intake regulating valve is used to adjust 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 of the first flow channel (1) is connected to the main air intake of the expander.

4. The method according to claim 3, characterized in that The expander air intake regulation strategy is used to regulate the output power of the expander, and further comprises the following steps: adjusting the second opening of the heat flow regulating valve so as to maintain the intake air temperature of the expander unchanged; The heat flow regulating valve is used to adjust 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 of the expander; the air inlet of the heat exchanger is connected to the air supply system through the first flow channel (1); the air outlet of the heat exchanger 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, they enter the main air inlet of the expander through the third flow channel (3).

5. The method according to claim 4, characterized in that The expander impeller adjustment strategy is used to adjust the output power of the expander, comprising the following steps: adjusting the third opening of the second regulating valve to adjust the damping force generated by the jet generator on the impeller of the expander, thereby adjusting the output power of the expander; The second regulating valve is used to adjust the flow rate of the seventh flow channel (7), and the seventh flow channel (7) is used to provide air flow to the jet generator.

6. The method according to claim 5, characterized in that The expander exhaust adjustment strategy is used to adjust the output power of the expander, including the following steps: Opening the exhaust valve and adjusting the fourth opening degree of the first regulating valve to adjust the exhaust volume of the expander, thereby adjusting the output power of the expander; The exhaust valve is used to control the opening and closing of the exhaust passage of the expander, and the first regulating valve is used to adjust the exhaust volume of the expander.

7. The method according to claim 6, characterized in that 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 output power of the expander until the real-time speed meets the preset speed condition, including the following steps: When it is determined that the real-time speed does not meet the preset speed condition, the output power of the expander is adjusted by using the expander air intake adjustment strategy; When it is determined that the expander is in an intake limit state and the real-time speed does not meet the preset speed condition, the output power of the expander is adjusted using the expander impeller adjustment strategy; When it is determined that the expander impeller is in a damping force limit state and the real-time speed does not meet the preset speed condition, the output power of the expander is adjusted using the expander exhaust adjustment strategy; 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 expander exhaust adjustment strategy is adopted to adjust the output power of the expander until the real-time speed meets the preset speed condition.

8. The method according to claim 7, characterized in that When the expander is in an intake limit state, the first opening degree is within a first preset opening degree range, and / or the second opening degree is within a second preset opening degree range.

9. The method according to claim 7, characterized in that: When the expander impeller is in a damping force limit state, the third opening degree is in a third preset opening degree range.

10. The method according to claim 7, characterized in that 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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