Power oscillation control system applied to compressed air energy storage system

Abstract

According to the power oscillation control system applied to the compressed air energy storage system provided by the invention, the data acquisition module can acquire the flow change rate of the real-time flow of the expansion machine flowing into the compressed air energy storage system and the opening degree variable quantity of the air inlet valve of the expansion machine at the current moment; the flow change rate and the opening degree change quantity are sent to a control system; the control system judges whether the expansion machine enters a power oscillation state or not according to the flow change rate and the opening degree variable quantity, and when it is determined that the expansion machine enters the power oscillation state, the flow change rate is input into a power oscillation processing module; the power oscillation processing module determines a target control strategy according to the flow change rate, and adjusts related parts in the compressed air energy storage system according to the target control strategy, or sends the target control strategy to an adjustment execution mechanism; and the adjustment execution mechanism can adjust related parts in the compressed air energy storage system according to the target control strategy so as to suppress power oscillation.

Description

Technical Field

[0001] The present application relates to the technical field, and in particular to a power oscillation control system applied to a compressed air energy storage system. Background Art

[0002] With the rapid development of renewable energy, power grid supply and demand fluctuations have intensified. Compressed air energy storage (CAES) systems have gained attention for their large-scale energy storage and peak-shaving capabilities. CAES systems compress air to store energy during periods of low electricity demand and release it during peak periods to drive expanders and generators. However, during operation, CAES systems experience fluctuations and oscillations in the expander intake flow rate due to the nonlinearity and unstable adjustment of the intake valve in certain adjustment ranges.

[0003] When the above situation occurs, if the control method and adjustment operation are not timely and appropriate, it will cause flow fluctuations to diverge, thereby triggering power oscillations of the compressed air generator set, and then causing disturbances to the power grid. Especially in the stage of smoothing the fluctuations of renewable energy output or frequency regulation, the impact is more prominent, thereby endangering the safe operation of the power grid. Summary of the Invention

[0004] The purpose of this application is to solve at least one of the above-mentioned technical defects, especially the technical defect in the prior art that the compressed air energy storage system cannot be properly adjusted and controlled in time when the expander intake flow fluctuates and oscillates, which affects the safety and stability of the power grid.

[0005] The present application provides a power oscillation control system for a compressed air energy storage system, the system comprising a data acquisition module, a control system, a power oscillation handling module, and a regulating actuator;

[0006] The data acquisition module collects the flow rate change rate of the real-time flow of the expander flowing into the compressed air energy storage system and the opening change of the intake valve of the expander at the current moment, and sends the flow rate change rate and the opening change to the control system;

[0007] The control system determines whether the expander enters a power oscillation state based on the flow rate change rate and the opening degree change amount, and inputs the flow rate change rate into the power oscillation handling module when it is determined that the expander enters a power oscillation state;

[0008] The power oscillation handling module determines a target control strategy according to the flow rate change rate, and adjusts relevant components in the compressed air energy storage system according to the target control strategy, or sends the target control strategy to the regulating actuator;

[0009] The regulating actuator adjusts relevant components in the compressed air energy storage system according to the target control strategy to suppress power oscillation.

[0010] Optionally, the process of the data acquisition module acquiring the flow rate change rate of the real-time flow of the expander flowing into the compressed air energy storage system includes:

[0011] The data acquisition module collects the real-time flow of the expander flowing into the compressed air energy storage system at each moment, and calculates the flow change rate corresponding to the real-time flow at two adjacent moments according to a preset time interval.

[0012] Optionally, the control system determines whether the expander enters a power oscillation state according to the flow rate change rate and the opening degree change amount, including:

[0013] The control system compares the flow rate change rate with a first preset change rate threshold to obtain a first comparison result, compares the opening change amount with a preset change amount threshold to obtain a second comparison result, and determines whether the expander enters a power oscillation state based on the first comparison result and the second comparison result.

[0014] Optionally, the process of the control system determining whether the expander enters a power oscillation state according to the first comparison result and the second comparison result includes:

[0015] When the control system determines that the flow rate change rate is not greater than the first preset change rate threshold as a result of the first comparison and that the opening degree change is not greater than the preset change amount threshold as a result of the second comparison, the expander is determined not to have entered a power oscillation state;

[0016] When the control system determines that the first comparison result is that the flow rate change rate is greater than the first preset change rate threshold, and the second comparison result is that the opening change amount is not greater than the preset change amount threshold, the expander is determined to enter a power oscillation state.

[0017] Optionally, the process of the power oscillation handling module determining a target control strategy according to the flow rate change rate includes:

[0018] The power oscillation handling module compares the flow rate change rate with a second preset change rate threshold, and determines a target control strategy according to a third comparison result;

[0019] The second preset change rate threshold is greater than the first preset change rate threshold.

[0020] Optionally, the process of the power oscillation handling module determining the target control strategy according to the third comparison result includes:

[0021] When the power oscillation handling module determines that the flow rate change rate is not greater than the second preset change rate threshold as a result of the third comparison, the power loop control mode is adopted;

[0022] When the power oscillation handling module determines that the flow rate change rate is greater than the second preset change rate threshold as a result of the third comparison, the valve control mode is adopted.

[0023] Optionally, the power oscillation handling module adjusts relevant components in the compressed air energy storage system according to the target control strategy, or sends the target control strategy to the regulating actuator, including:

[0024] When the target control strategy is determined to be a power loop control mode, the power oscillation handling module adjusts relevant components of the compressed air energy storage system according to the power loop control mode;

[0025] When the power oscillation handling module determines that the target control strategy is the valve control mode, the power oscillation handling module sends the valve control mode to the regulating actuator.

[0026] Optionally, the power oscillation handling module adjusts relevant components in the compressed air energy storage system according to the power loop control mode, including:

[0027] After the power oscillation processing module obtains the flow difference and flow frequency difference of the expander, it uses the flow difference and the flow frequency difference as PID input signals, outputs a valve opening signal after PID calculation, and adjusts the valve opening of the power regulating valve in the compressed air energy storage system according to the valve opening signal.

[0028] Optionally, when the target control strategy is a valve control mode, the process of the regulating actuator adjusting relevant components in the compressed air energy storage system according to the target control strategy includes:

[0029] The regulating actuator positions the intake valve position of the expander at the current opening according to the valve control mode and locks the valve adjustment instruction until the power fluctuation is dissipated and eliminated, and then releases the valve adjustment instruction lock.

[0030] Optionally, the control system is further configured to:

[0031] During the control process, whether to open the speed regulating valve is determined according to the speed of the generator in the compressed air energy storage system.

[0032] It can be seen from the above technical solutions that the embodiments of the present application have the following advantages:

[0033] The present application provides a power oscillation control system for a compressed air energy storage system, the system comprising a data acquisition module, a control system, a power oscillation handling module, and a regulating actuator; the data acquisition module can collect the flow rate change rate of the real-time flow of the expander flowing into the compressed air energy storage system, as well as the opening change of the expander's intake valve at the current moment, and then send the flow rate change rate and the opening change to the control system; the control system determines whether the expander has entered a power oscillation state based on the flow rate change rate and the opening change, and inputs the flow rate change rate to the power oscillation handling module when it determines that the expander has entered a power oscillation state; the power oscillation handling module determines a target control strategy based on the flow rate change rate, and adjusts relevant components in the compressed air energy storage system according to the target control strategy, or sends the target control strategy to the regulating actuator; the regulating actuator adjusts relevant components in the compressed air energy storage system according to the target control strategy to suppress power oscillation. The present application can quickly respond to power oscillation, suppress the amplification of power oscillation of the expander generator set, effectively improve the safety and reliability of the system, and through the technical solution of the present application, the CAES system can operate more stably, thereby playing an important role in promoting the commercial application of compressed air energy storage technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0035] Figure 1 A schematic diagram of the structure of a power oscillation control system applied to a compressed air energy storage system provided in an embodiment of the present application;

[0036] Figure 2 A system architecture diagram of a compressed air energy storage system provided in an embodiment of the present application;

[0037] Figure 3 A schematic diagram of the control process when using PID to adjust flow fluctuations provided in an embodiment of the present application;

[0038] Figure 2 Among them, 1. Gas storage tank; 2. Heat storage tank; 3. Cold storage tank; 4-7. Expander; 8-11. Plate heat exchanger; 12. Heat exchange main valve; 13. High-pressure main gas valve; 14. Speed regulating valve; 15. Power regulating valve; 16-22. Expander inlet and outlet regulating valves; 23-25. Expander exhaust valve; 26-29. Heat exchange valve; 30. Heat pump; 31. Generator. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0040] In one embodiment, Figure 1 As shown, Figure 1 A structural schematic diagram of a power oscillation control system applied to a compressed air energy storage system provided in an embodiment of the present application; the present application provides a power oscillation control system applied to a compressed air energy storage system, the system including a data acquisition module, a control system, a power oscillation handling module and a regulating actuator.

[0041] The data acquisition module collects the flow change rate of the real-time flow of the expander flowing into the compressed air energy storage system and the opening change of the intake valve of the expander at the current moment, and then sends the flow change rate and the opening change to the control system.

[0042] The control system determines whether the expander enters a power oscillation state based on the flow rate change rate and the opening degree change amount, and inputs the flow rate change rate to the power oscillation handling module when it is determined that the expander enters a power oscillation state.

[0043] The power oscillation handling module determines a target control strategy according to the flow rate change rate, and adjusts relevant components in the compressed air energy storage system according to the target control strategy, or sends the target control strategy to the regulating actuator.

[0044] The regulating actuator adjusts relevant components in the compressed air energy storage system according to the target control strategy to suppress power oscillation.

[0045] In this embodiment, Figure 2 As shown, Figure 2The system architecture diagram of the compressed air energy storage system provided in the embodiment of the present application includes an expander 4-7, a generator 31, a power grid, a high-pressure main air valve 13, expander inlet and outlet regulating valves 16-22, a power regulating valve 15, a speed regulating valve 14, an expansion generator set bearing, a speed measuring device, a heat exchange valve 26-29, a gas tank 1, an expander outlet exhaust valve 23-25, and a plate heat exchanger. Among them, the present application can measure the speed of the generator 31 through a speed measuring device, and the electric energy generated by the generator 31 is connected to the power grid through a grid-connected switch; the gas tank 1 and the expander 4-7 are first connected through the high-pressure main air valve 13, and then connected in parallel through the power regulating valve 15 and the speed regulating valve 14; the expander 4-7 of the present application is an expander generator set, including a compressed air generator set, a carbon dioxide generator set, etc., which drives the generator 31 to generate active power through a rotating machine.

[0046] When the present application monitors the power oscillation of the compressed air energy storage system through a power oscillation control system, the power oscillation control system may include a data acquisition module, a control system, a power oscillation processing module and an adjustment actuator. Among them, the data acquisition module of the present application can collect the expander inlet flow and unit power in real time through pre-installed sensors, flow acquisition systems, etc., and send a signal to the control system. The control system can judge whether the unit is likely to enter a power oscillation state based on the feedforward flow signal and flow change rate, and output a signal to the power oscillation processing module. The power oscillation processing module can judge whether to use PID adaptive adjustment to pass the power oscillation condition based on the size of the flow change rate, or switch the intake control valve to valve control mode by adjusting the actuator. The adjustment actuator can control the intake valve action to pass the valve adjustment unstable area according to the output signal of the power oscillation processing module, or directly switch to valve control mode to wait for the power oscillation of the unit to stabilize and no longer fluctuate before making adjustments under the valve control mode.

[0047] Specifically, the data acquisition module of the present application can collect the real-time flow of the expander flowing into the compressed air energy storage system, and after calculating the flow change rate based on the real-time flow, send the flow change rate to the control system. The data acquisition module of the present application can also collect the opening change of the intake valve of the expander at the current moment, and send the opening change to the control system, so that the control system can judge whether the expander enters the power oscillation state based on the flow change rate and the opening change, and when it is determined that the expander enters the power oscillation state, the flow change rate is input into the power oscillation disposal module, so that the power oscillation disposal module determines the target control strategy based on the flow change rate, and adjusts the relevant components in the compressed air energy storage system according to the target control strategy, or sends the target control strategy to the regulating actuator, and adjusts the relevant components in the compressed air energy storage system according to the target control strategy through the regulating actuator to suppress power oscillation.

[0048] In the above embodiment, the system includes a data acquisition module, a control system, a power oscillation handling module and a regulating actuator; the data acquisition module can collect the flow rate change rate of the real-time flow of the expander flowing into the compressed air energy storage system, and the opening change of the expander's intake valve at the current moment, and then send the flow rate change rate and opening change to the control system; the control system determines whether the expander enters the power oscillation state based on the flow rate change rate and the opening change, and inputs the flow rate change rate to the power oscillation handling module when it is determined that the expander enters the power oscillation state; the power oscillation handling module determines the target control strategy based on the flow rate change rate, and adjusts the relevant components in the compressed air energy storage system according to the target control strategy, or sends the target control strategy to the regulating actuator; the regulating actuator adjusts the relevant components in the compressed air energy storage system according to the target control strategy to suppress power oscillation. The present application can respond quickly under power oscillation, suppress the amplification of power oscillation of the expander generator set, effectively improve the safety and reliability of the system, and through the technical solution of the present application, the CAES system can operate more stably, thereby playing an important role in promoting the commercial application of compressed air energy storage technology.

[0049] In one embodiment, the process of the data acquisition module acquiring the flow rate change rate of the real-time flow of the expander flowing into the compressed air energy storage system may include:

[0050] The data acquisition module collects the real-time flow of the expander flowing into the compressed air energy storage system at each moment, and calculates the flow change rate corresponding to the real-time flow at two adjacent moments according to a preset time interval.

[0051] In this embodiment, when calculating the flow rate change rate of the expander, the data acquisition module may first collect the real-time flow rate flowing into the expander at each moment, and then calculate the flow rate change rate corresponding to the real-time flow rate at two adjacent moments according to a preset time interval.

[0052] In a specific implementation, when the expander of the present application is connected to the grid and operates normally, the unit output increases or decreases with the grid demand. During this process, the data acquisition module can collect the real-time flow rate flowing into the expander at the i-th moment. , and calculate the traffic change rate of real-time traffic at two adjacent moments over time according to the preset time interval of every 100ms. The specific calculation formula is as follows:

[0053]

[0054] in, is the flow rate change rate, is the real-time traffic at the first moment between two adjacent moments, is the real-time traffic at the second moment of two adjacent moments, is the time interval between two adjacent moments, is the flow difference.

[0055] The flow rate change rate corresponding to the real-time flow rate at two adjacent moments can be calculated by the above formula. The data acquisition module sends the flow rate change rate to the control system so that the control system can quickly determine whether the expander enters a power oscillation state.

[0056] In one embodiment, the process of the control system determining whether the expander enters a power oscillation state according to the flow rate change rate and the opening degree change amount may include:

[0057] The control system compares the flow rate change rate with a first preset change rate threshold to obtain a first comparison result, compares the opening change amount with a preset change amount threshold to obtain a second comparison result, and determines whether the expander enters a power oscillation state based on the first comparison result and the second comparison result.

[0058] In this embodiment, after receiving the flow change rate and the change in the opening of the intake valve sent by the data acquisition module, the control system can compare the flow change rate with the first preset change rate threshold to obtain a first comparison result, and can also compare the opening change with the preset change threshold to obtain a second comparison result. In this way, the control system can comprehensively judge whether the expander has entered a power oscillation state based on the first comparison result and the second comparison result, thereby effectively improving the judgment accuracy.

[0059] Among them, the first preset change rate threshold and the preset change amount threshold of the present application can be set according to actual conditions and are not limited here.

[0060] In one embodiment, the process of the control system determining whether the expander enters a power oscillation state according to the first comparison result and the second comparison result may include:

[0061] When the control system determines that the flow rate change rate is not greater than the first preset change rate threshold as a result of the first comparison and the opening degree change is not greater than the preset change threshold as a result of the second comparison, it determines that the expander has not entered a power oscillation state.

[0062] When the control system determines that the first comparison result is that the flow rate change rate is greater than the first preset change rate threshold, and the second comparison result is that the opening change amount is not greater than the preset change amount threshold, the expander is determined to enter a power oscillation state.

[0063] In this embodiment, after the control system obtains the first comparison result and the second comparison result, it can comprehensively determine whether the expander enters the power oscillation state based on the first comparison result and the second comparison result.

[0064] Specifically, the control system in the present application determines that the expander has not entered the power oscillation state when the first comparison result is that the flow change rate is not greater than the first preset change rate threshold, and the second comparison result is that the opening change is not greater than the preset change threshold; when the first comparison result is that the flow change rate is greater than the first preset change rate threshold, and the second comparison result is that the opening change is not greater than the preset change threshold, it is determined that the expander has entered the power oscillation state. At this time, the power oscillation handling module can be started to perform power oscillation control operations to suppress power oscillation.

[0065] For example, the control system in this application determines the change in the opening of the intake valve and When the unit is judged to have no power oscillation, it can be adjusted and operated according to the normal adjustment mode; when the change in the opening of the intake valve and When the power oscillation occurs, the unit is judged to have started to experience power oscillation, and the power oscillation handling module can be used for adjustment.

[0066] In one embodiment, the process of the power oscillation handling module determining the target control strategy according to the flow rate change rate may include:

[0067] The power oscillation handling module compares the flow rate change rate with a second preset change rate threshold, and determines a target control strategy according to a third comparison result.

[0068] The second preset change rate threshold is greater than the first preset change rate threshold.

[0069] In this embodiment, when the power oscillation handling module determines the target control strategy based on the flow change rate, the flow change rate can be compared with the second preset change rate threshold, and the target control strategy can be determined based on the third comparison result, wherein the second preset change rate threshold of the present application is greater than the first preset change rate threshold. The present application determines different target control strategies by setting multiple change rate thresholds, so as to achieve the purpose of flexible adjustment.

[0070] In one embodiment, the process of the power oscillation handling module determining the target control strategy according to the third comparison result may include:

[0071] When the power oscillation handling module determines that the flow rate change rate is not greater than the second preset change rate threshold as a result of the third comparison, it determines to adopt the power loop control mode.

[0072] When the power oscillation handling module determines that the flow rate change rate is greater than the second preset change rate threshold as a result of the third comparison, the valve control mode is adopted.

[0073] In this embodiment, when the power oscillation handling module determines the target control strategy based on the third comparison result, it can first determine the content of the third comparison result. When the third comparison result is that the flow change rate is not greater than the second preset change rate threshold, the power loop control mode is adopted. When the third comparison result is that the flow change rate is greater than the second preset change rate threshold, the valve control mode is adopted. In this way, the power oscillation is adjusted through different modes, thereby effectively suppressing the power oscillation.

[0074] In one embodiment, the process of the power oscillation handling module adjusting relevant components in the compressed air energy storage system according to the target control strategy, or sending the target control strategy to the regulating actuator, may include:

[0075] When determining that the target control strategy is a power loop control mode, the power oscillation handling module adjusts relevant components in the compressed air energy storage system according to the power loop control mode.

[0076] When the power oscillation handling module determines that the target control strategy is the valve control mode, the power oscillation handling module sends the valve control mode to the regulating actuator.

[0077] In this embodiment, after the power oscillation handling module determines the target control strategy, if the target control strategy is the power loop control mode, it can use PID adaptive adjustment to overcome the power oscillation condition; if the target control strategy is the valve control mode, it can output a signal to the regulating actuator so that the regulating actuator adjusts the relevant components in the compressed air energy storage system according to the regulation method under the valve control mode, so as to suppress power oscillation.

[0078] In one embodiment, the power oscillation handling module adjusts relevant components of the compressed air energy storage system according to the power loop control mode, which may include:

[0079] After the power oscillation processing module obtains the flow difference and flow frequency difference of the expander, it uses the flow difference and the flow frequency difference as PID input signals, outputs a valve opening signal after PID calculation, and adjusts the valve opening of the power regulating valve in the compressed air energy storage system according to the valve opening signal.

[0080] In this embodiment, when the power oscillation handling module determines that the target control strategy is the power loop control mode, composite control can be performed through the feedforward control signal and PID feedback information, thereby effectively suppressing power oscillation.

[0081] Schematically, as Figure 3 As shown, Figure 3 A schematic diagram of the control process when using PID to adjust flow fluctuations provided in an embodiment of the present application; Figure 3 In this application, after the flow difference and flow frequency difference of the expander are input into PID, the PID is combined with the time function of the flow difference and the flow amplitude difference function for PID adjustment, and then the valve opening signal is output. Then, the valve opening of the power regulating valve in the compressed air energy storage system is adjusted according to the valve opening signal, and after obtaining the adjusted flow difference and flow frequency difference of the expander, the corresponding valve opening signal is calculated again, and the valve opening of the power regulating valve in the compressed air energy storage system is adjusted, so as to control the output of the expander and eliminate the influence of flow deviation on power output.

[0082] Table 1 Related parameters when using PID to adjust flow fluctuations

[0083]

[0084] The transfer function of flow regulation in this application can be set as:

[0085]

[0086] The power oscillation processing module of the present application can use the flow difference and flow frequency difference of the expander as the input signal of PID. It is the Laplace transform of the input signal, and the output valve opening signal is calculated by PID to control the flow of the control system and suppress power fluctuations. is the Laplace transform of the valve opening signal.

[0087] In a specific implementation, when the control system determines the change in the opening of the intake valve and When the unit starts to experience power oscillation, the PID automatic adjustment begins to intervene and the frequency change As the feedforward control signal of the power oscillation handling module, the power deviation function can be , the deviation value is The integrated power signal adjusts the valve opening of the power control valve and then controls the output of the expander, thereby eliminating the impact of flow deviation on power output and suppressing power oscillation.

[0088] Furthermore, the power regulating valve of the present application is pneumatically operated and can automatically adjust the valve opening. The front and rear regulating valves of the expander are also pneumatically operated and can automatically adjust the valve opening. Of course, the present application can also manually open the power regulating valve, and during the opening process, monitor the expander intake flow and power for fluctuations until the power regulating valve opening jumps out of the unstable adjustment zone, which can also suppress power oscillations.

[0089] In one embodiment, when the target control strategy is a valve control mode, the process of the regulating actuator adjusting the relevant components of the compressed air energy storage system according to the target control strategy may include:

[0090] The regulating actuator positions the intake valve position of the expander at the current opening according to the valve control mode and locks the valve adjustment instruction until the power fluctuation is dissipated and eliminated, and then releases the valve adjustment instruction lock.

[0091] In this embodiment, when the target control strategy is the valve control mode, the power oscillation handling module of the present application can output an adjustment instruction to the adjustment actuator, so that the adjustment actuator adjusts the relevant components in the compressed air energy storage system according to the instruction.

[0092] For example, when the intake valve opening changes and When the power oscillation continues for 1 second, the power oscillation disposal module sends a signal to the regulating actuator to switch the unit control mode from the power loop control mode to the valve control mode, and position the intake valve at the current opening and lock the valve adjustment command until the power fluctuation is dissipated and eliminated, and then release the valve adjustment command lock, so that the power oscillation can be suppressed in time.

[0093] In one embodiment, the control system can also be used to: during the control process, determine whether to open the speed regulating valve according to the speed of the generator in the compressed air energy storage system, so as to further suppress power oscillations, thereby effectively improving the stability and safety of the power grid.

[0094] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0095] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The various embodiments can be combined as needed, and the same or similar parts can be referenced to each other.

[0096] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A power oscillation control system for a compressed air energy storage system, characterized in that: The system includes a data acquisition module, a control system, a power oscillation treatment module and a regulating actuator; The data acquisition module collects the flow rate change rate of the real-time flow of the expander flowing into the compressed air energy storage system and the opening change of the intake valve of the expander at the current moment, and sends the flow rate change rate and the opening change to the control system; The control system determines whether the expander enters a power oscillation state based on the flow rate change rate and the opening degree change amount, and inputs the flow rate change rate into the power oscillation handling module when it is determined that the expander enters a power oscillation state; The power oscillation handling module determines a target control strategy according to the flow rate change rate, and adjusts relevant components in the compressed air energy storage system according to the target control strategy, or sends the target control strategy to the regulating actuator; The regulating actuator adjusts relevant components in the compressed air energy storage system according to the target control strategy to suppress power oscillation.

2. The power oscillation control system for a compressed air energy storage system according to claim 1, characterized in that: The process of the data acquisition module acquiring the flow rate change rate of the real-time flow of the expander flowing into the compressed air energy storage system includes: The data acquisition module collects the real-time flow of the expander flowing into the compressed air energy storage system at each moment, and calculates the flow change rate corresponding to the real-time flow at two adjacent moments according to a preset time interval.

3. The power oscillation control system for a compressed air energy storage system according to claim 1, characterized in that: The process of the control system determining whether the expander enters a power oscillation state according to the flow rate change rate and the opening degree change amount includes: The control system compares the flow rate change rate with a first preset change rate threshold to obtain a first comparison result, compares the opening change amount with a preset change amount threshold to obtain a second comparison result, and determines whether the expander enters a power oscillation state based on the first comparison result and the second comparison result.

4. The power oscillation control system for a compressed air energy storage system according to claim 3, characterized in that: The process of the control system determining whether the expander enters a power oscillation state according to the first comparison result and the second comparison result includes: When the control system determines that the flow rate change rate is not greater than the first preset change rate threshold as a result of the first comparison and that the opening degree change is not greater than the preset change amount threshold as a result of the second comparison, the expander is determined not to have entered a power oscillation state; When the control system determines that the first comparison result is that the flow rate change rate is greater than the first preset change rate threshold, and the second comparison result is that the opening change amount is not greater than the preset change amount threshold, the expander is determined to enter a power oscillation state.

5. The power oscillation control system for a compressed air energy storage system according to claim 3, characterized in that: The process of the power oscillation handling module determining a target control strategy according to the flow rate change rate includes: The power oscillation handling module compares the flow rate change rate with a second preset change rate threshold, and determines a target control strategy according to a third comparison result; The second preset change rate threshold is greater than the first preset change rate threshold.

6. The power oscillation control system for a compressed air energy storage system according to claim 5, characterized in that: The process of the power oscillation handling module determining the target control strategy according to the third comparison result includes: When the power oscillation handling module determines that the flow rate change rate is not greater than the second preset change rate threshold as a result of the third comparison, the power loop control mode is adopted; When the power oscillation handling module determines that the flow rate change rate is greater than the second preset change rate threshold as a result of the third comparison, the valve control mode is adopted.

7. The power oscillation control system for a compressed air energy storage system according to claim 1, characterized in that: The process in which the power oscillation handling module adjusts relevant components in the compressed air energy storage system according to the target control strategy, or sends the target control strategy to the regulating actuator, includes: When the target control strategy is determined to be a power loop control mode, the power oscillation handling module adjusts relevant components of the compressed air energy storage system according to the power loop control mode; When the power oscillation handling module determines that the target control strategy is the valve control mode, the power oscillation handling module sends the valve control mode to the regulating actuator.

8. The power oscillation control system for a compressed air energy storage system according to claim 7, characterized in that: The power oscillation handling module adjusts relevant components of the compressed air energy storage system according to the power loop control mode, including: After the power oscillation processing module obtains the flow difference and flow frequency difference of the expander, it uses the flow difference and the flow frequency difference as PID input signals, outputs a valve opening signal after PID calculation, and adjusts the valve opening of the power regulating valve in the compressed air energy storage system according to the valve opening signal.

9. The power oscillation control system for a compressed air energy storage system according to claim 1, characterized in that: When the target control strategy is a valve control mode, the process of the regulating actuator adjusting the relevant components of the compressed air energy storage system according to the target control strategy includes: The regulating actuator positions the intake valve position of the expander at the current opening according to the valve control mode and locks the valve adjustment instruction until the power fluctuation is dissipated and eliminated, and then releases the valve adjustment instruction lock.

10. The power oscillation control system for a compressed air energy storage system according to any one of claims 1 to 9, characterized in that: The control system is also used to: During the control process, whether to open the speed regulating valve is determined according to the speed of the generator in the compressed air energy storage system.

Images