Energy storage type doubly-fed phase modifier frequency active support control method and device

Abstract

The application is suitable for the field of electric power technology, and provides a frequency active support control method and device for energy storage type doubly-fed phase modifier, the method comprises the following steps: acquiring the frequency and frequency change rate of the power grid; judging whether the frequency meets the determination condition of deviating from the rated frequency; if the frequency meets the determination condition, executing a speed correction process: determining the speed correction amount according to the frequency change rate and the speed adjustment margin; correcting the speed of the phase modifier according to the speed correction amount; judging whether the frequency reaches the highest point or the lowest point; if the frequency reaches the highest point or the lowest point, controlling the speed of the phase modifier to be the sampling value when the frequency change rate is equal to zero; if the frequency does not reach the highest point or the lowest point, executing the speed correction process again. The application can improve the frequency active support capability of the energy storage type doubly-fed phase modifier.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electric power, and particularly relates to a frequency active support control method and device for a storage-type doubly-fed phase modifier. BACKGROUND

[0002] In recent years, the grid-connected scale of new energy and power electronic devices has been increasing, and synchronous machines have been gradually replaced by new energy power generation devices, resulting in a downward trend in the inertia and voltage support capacity of the power grid system. At present, synchronous phase modifiers with strong voltage support capacity and improved frequency response characteristics are one of the means to ensure the safe and stable operation of the power system.

[0003] The conventional synchronous phase modifier has small inherent mechanical inertia, less effective energy storage, and insufficient transient active support capacity, and cannot meet the frequency support requirements of the high-proportion new energy power system. The storage-type doubly-fed phase modifier is a device that applies a doubly-fed induction motor to a phase modifier, which is equipped with a coaxial flywheel on the rotor side to increase the mechanical rotational inertia of the unit, and can present a larger virtual inertia relative to the inherent mechanical inertia of the synchronous phase modifier through wide-range variable-speed operation, thereby providing frequency support capacity for the system.

[0004] At present, the frequency active support method for the storage-type doubly-fed phase modifier mainly includes virtual inertia control, that is, a virtual inertia link is added on the basis of active control. This method has the following disadvantages: (1) the virtual inertia control cannot control the speed, and the phase modifier needs to be switched to speed control in the steady state and smoothed, and the control structure is relatively complex; (2) the virtual inertia control cannot balance the stability and dynamic characteristics of the frequency: if the virtual inertia coefficient is too small, the frequency support effect is not obvious; and if the virtual inertia coefficient is too large, the dynamic response of the system is slow and even oscillation problems occur. SUMMARY

[0005] Therefore, the embodiments of the present application provide a frequency active support control method and device for a storage-type doubly-fed phase modifier to improve the frequency active support capacity of the storage-type doubly-fed phase modifier.

[0006] A first aspect of the embodiments of the present application provides a frequency active support control method for a storage-type doubly-fed phase modifier, which comprises:

[0007] obtaining the frequency and the frequency change rate of the power grid;

[0008] determining whether the frequency meets a determination condition of deviating from the rated frequency;

[0009] if the frequency meets the determination condition, performing a speed correction process: determining a speed correction amount according to the frequency change rate and a speed adjustment margin; and correcting the speed of the phase modifier according to the speed correction amount;

[0010] judging whether the frequency reaches a maximum point or a minimum point; if the frequency reaches the maximum point or the minimum point, controlling the rotating speed of the phase modifier to be a sampling value when the frequency variation rate is equal to zero; if the frequency does not reach the maximum point or the minimum point, executing the rotating speed correction process again.

[0011] With reference to the first aspect, in a possible implementation manner of the first aspect, the judging whether the frequency meets the determination condition of deviating from the rated frequency comprises:

[0012] if the frequency is less than or equal to the rated frequency and the frequency variation rate is less than zero, it is determined that the frequency meets the determination condition of deviating from the rated frequency;

[0013] or, if the frequency is greater than or equal to the rated frequency and the frequency variation rate is greater than zero, it is determined that the frequency meets the determination condition of deviating from the rated frequency.

[0014] With reference to the first aspect, in a possible implementation manner of the first aspect, the determining the rotating speed correction amount according to the frequency variation rate and the rotating speed adjustment margin comprises:

[0015] determining the rotating speed correction amount according to

[0016] wherein ω r,max and ω r,min are maximum and minimum limits of the rotating speed of the phase modifier; ω r is the real-time rotating speed of the phase modifier; df / dt is the frequency variation rate; k1 and k2 are control coefficients; f n is the rated frequency.

[0017] With reference to the first aspect, in a possible implementation manner of the first aspect, the correcting the rotating speed of the phase modifier according to the rotating speed correction amount comprises:

[0018] determining a rotating speed reference value of the phase modifier according to ω r,ref = ω r + Δω r wherein ω r,ref is the rotating speed reference value of the phase modifier; ω r is the real-time rotating speed of the phase modifier, and Δω r is the rotating speed correction amount.

[0019] controlling the rotating speed of the phase modifier according to the rotating speed reference value.

[0020] With reference to the first aspect, in a possible implementation manner of the first aspect, the method further comprises:

[0021] ​If the frequency does not satisfy the determination condition, it is determined whether the frequency is in a standard state, the standard state being that the frequency is equal to a rated frequency and the frequency change rate is equal to zero.

[0022] According to whether the frequency is in the standard state, the rotating speed of the phase modifier is controlled.

[0023] With reference to the first aspect, in a possible implementation manner of the first aspect, the controlling of the rotating speed of the phase modifier according to whether the frequency is in the standard state comprises:

[0024] If the frequency is in the standard state, the rotating speed of the phase modifier is controlled to be a rated rotating speed.

[0025] With reference to the first aspect, in a possible implementation manner of the first aspect, the controlling of the rotating speed of the phase modifier according to whether the frequency is in the standard state comprises:

[0026] If the frequency is not in the standard state, the rotating speed of the phase modifier is controlled to be a sampling value when the frequency change rate is equal to zero.

[0027] A second aspect of the embodiment of the present application provides a frequency active support control device for a double-fed phase modifier of energy storage type, comprising:

[0028] An acquisition module is configured to acquire a frequency and a frequency change rate of a power grid.

[0029] A determination module is configured to determine whether the frequency satisfies a determination condition of moving away from a rated frequency.

[0030] A control module is configured to, if the frequency satisfies the determination condition, perform a rotating speed correction process, wherein the rotating speed correction process comprises: determining a rotating speed correction amount according to the frequency change rate and a rotating speed adjustment margin; and correcting the rotating speed of the phase modifier according to the rotating speed correction amount.

[0031] It is determined whether the frequency reaches a highest point or a lowest point, and if the frequency reaches the highest point or the lowest point, the rotating speed of the phase modifier is controlled to be a sampling value when the frequency change rate is equal to zero, and if the frequency does not reach the highest point or the lowest point, the rotating speed correction process is performed again.

[0032] With reference to the second aspect, in a possible implementation manner of the second aspect, the determination module is specifically configured to:

[0033] If the frequency is less than or equal to the rated frequency and the frequency change rate is less than zero, it is determined that the frequency satisfies the determination condition of moving away from the rated frequency.

[0034] Alternatively, if the frequency is greater than or equal to the rated frequency and the frequency change rate is greater than zero, it is determined that the frequency satisfies the determination condition of moving away from the rated frequency.

[0035] With reference to the second aspect, in a possible implementation manner of the second aspect, the control module is specifically configured to:

[0036] According to determining a speed correction amount;

[0037] wherein ω r,max and ω r,min are maximum and minimum limits of the speed of the phase modifier; ω r is a real-time speed of the phase modifier; df / dt is the frequency change rate; k1 and k2 are control coefficients; and f n is the rated frequency.

[0038] With reference to the second aspect, in a possible implementation manner of the second aspect, the control module is specifically configured to:

[0039] According to ω r,ref = ω r + Δω r , determining a speed reference value of the phase modifier; wherein ω r,ref is the speed reference value of the phase modifier; ω r is the real-time speed of the phase modifier, and Δω r is the speed correction amount.

[0040] According to the speed reference value, controlling the speed of the phase modifier.

[0041] With reference to the second aspect, in a possible implementation manner of the second aspect, the control module is further configured to:

[0042] If the frequency does not satisfy the determination condition, determining whether the frequency is in a standard state, the standard state being that the frequency is equal to the rated frequency and the frequency change rate is equal to zero.

[0043] According to whether the frequency is in the standard state, controlling the speed of the phase modifier.

[0044] With reference to the second aspect, in a possible implementation manner of the second aspect, the control module is specifically configured to:

[0045] If the frequency is in the standard state, controlling the speed of the phase modifier to be the rated speed.

[0046] With reference to the second aspect, in a possible implementation manner of the second aspect, the control module is specifically configured to:

[0047] If the frequency is not in the standard state, controlling the speed of the phase modifier to be a sampling value when the frequency change rate is equal to zero.

[0048] The third aspect of the embodiment of the present application provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the method in the first aspect or any one of the implementation manners of the first aspect when executing the computer program.

[0049] The fourth aspect of the embodiment of the present application provides a computer readable storage medium, which stores a computer program, and the computer program implements the steps of the method in the first aspect or any one of the implementation manners of the first aspect when executed by a processor.

[0050] Compared with the prior art, the embodiment of the present application has the following beneficial effects:

[0051] The embodiment of the present application adjusts the rotating speed of the phase modifier adaptively through the frequency change rate and the rotating speed adjustment margin when the frequency is far away from the rated frequency, so that the phase modifier emits or absorbs active power to provide inertia support. During the recovery of the frequency to the rated direction after the frequency reaches the highest point or the lowest point, the frequency is prevented from falling again by controlling the rotating speed of the phase modifier at the sampling value when the frequency change rate is equal to zero and keeping the rotating speed unchanged during the recovery of the rotating speed. The embodiment of the present application improves the active frequency support capability of the energy storage type doubly-fed phase modifier. BRIEF DESCRIPTION OF DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0053] Figure 1 is an application scenario diagram of the energy storage type doubly-fed phase modifier frequency active support control method provided by the embodiment of the present application;

[0054] Figure 2 is an implementation flow diagram of the energy storage type doubly-fed phase modifier frequency active support control method provided by the embodiment of the present application Figure 1 ;

[0055] Figure 3 is an implementation flow diagram of the energy storage type doubly-fed phase modifier frequency active support control method provided by the embodiment of the present application Figure 2 ;

[0056] Figure 4 is an example diagram of the power grid system simulation platform provided by the embodiment of the present application;

[0057] Figure 5is a schematic diagram of the running result of the system frequency provided by the embodiment of the present application;

[0058] Figure 6 is a schematic diagram of the running result of the system frequency rate provided by the embodiment of the present application;

[0059] Figure 7 is a schematic diagram of the running result of the active power of the phase modifier provided by the embodiment of the present application;

[0060] Figure 8 is a schematic diagram of the running result of the rotor speed provided by the embodiment of the present application;

[0061] Figure 9 is a schematic diagram of the structure of the energy storage type doubly-fed phase modifier frequency active support control device provided by the embodiment of the present application;

[0062] Figure 10 is a schematic diagram of the structure of the electronic device provided by the embodiment of the present application. DETAILED DESCRIPTION

[0063] In the following description, for the purpose of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application can be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

[0064] In order to illustrate the technical solutions described in the present application, the following will be described by specific embodiments.

[0065] Figure 1 is a schematic diagram of the application scenario of the energy storage type doubly-fed phase modifier frequency active support control method proposed by the embodiment of the present application, which shows the vector control structure of the rotor side converter of the phase modifier.

[0066] As shown in Figure 1 , the rotor side converter of the phase modifier frequency support control adopts a double-loop vector control structure, the inner loop adopts current control, and the outer loop adopts speed control, wherein the frequency rate df / dt is obtained by passing the system frequency f through a high-pass filter (Ts / (1+Ts)).

[0067] The outer loop of the energy storage type doubly-fed phase modifier always adopts speed control, wherein the speed reference value ω r,ref is adaptively generated according to the speed regulation margin and the system frequency rate, and there is no need to switch the speed and virtual inertia control. The speed reference value ω r,ref and the actual value ω r are taken as inputs, and the control reference value i of the current inner loop is obtained through a PI adjustment module.rd,ref .

[0068] Figure 2 is the implementation flowchart of the energy storage type doubly-fed phase modifier frequency active support control method proposed in the embodiment of the present application, comprising:

[0069] In step S201, the frequency f and the frequency change rate df / dt of the power grid are acquired.

[0070] Here, the frequency of the power grid is collected in real time, and the frequency change rate is calculated according to the frequency.

[0071] In step S202, it is judged whether the frequency meets the determination condition of moving away from the rated frequency.

[0072] In the present embodiment, if the frequency is less than or equal to the rated frequency, and the frequency change rate is less than zero (i.e. df / dt<0 and f≤f n ), it is determined that the frequency meets the determination condition of moving away from the rated frequency. Alternatively, if the frequency is greater than or equal to the rated frequency, and the frequency change rate is greater than zero (i.e. df / dt>0 and f≥f n ), it is also determined that the frequency meets the determination condition of moving away from the rated frequency.

[0073] In step S203, if the frequency meets the determination condition, a speed correction process is performed: the speed correction amount Δω r is determined according to the frequency change rate and the speed regulation margin; and the speed of the phase modifier is corrected according to the speed correction amount. The speed regulation margin can be a real-time dynamic value, and in the support process, the speed of the phase modifier is constantly changing, and the speed regulation margin also changes accordingly.

[0074] In the present embodiment, the speed correction amount is determined according to the following formula:

[0075]

[0076] In the formula, ω r,max and ω r,min are the maximum and minimum limits of the speed of the phase modifier; ω r is the real-time speed of the phase modifier; df / dt is the frequency change rate; k1 and k2 are control coefficients; f n is the rated frequency.

[0077] Here, when the frequency drops, the phase modifier reduces the speed to emit active power to provide frequency support, and the speed regulation margin is (ω r,min -ω r ); when the frequency rises, the phase modifier increases the speed to absorb active power to provide inertia support, and the speed regulation margin is (ω r,max -ω r ). |df / dt| k1 / (|df / dt|k1 +k2) is a number between 0 and 1, the greater the absolute value of the frequency change rate is, the closer to 1 k2 is, so that the speed correction of the phase modifier tends to the maximum speed adjustment margin.

[0078] Then, according to ω r,ref = ω r + Δω r The speed reference value of the phase modifier is determined; in the formula, ω r,ref is the speed reference value of the phase modifier; ω r is the real-time speed of the phase modifier, and Δω r is the speed correction.

[0079] Finally, the speed reference value is taken as the speed target control amount to control the speed of the phase modifier.

[0080] It can be seen that, during the frequency change process, the speed of the phase modifier continuously rises / descends with the support process, thereby absorbing / releasing active power, so as to suppress the frequency change of the system.

[0081] In step S204, it is judged whether the frequency reaches the highest point or the lowest point; if the frequency reaches the highest point or the lowest point, the speed of the phase modifier is controlled to be the sampling value when the frequency change rate is equal to zero; if the frequency does not reach the highest point or the lowest point, the speed correction process in step S203 is executed again until the frequency reaches the highest point or the lowest point, and the speed of the phase modifier is controlled to be the sampling value when the frequency change rate is equal to zero.

[0082] Here, when the frequency reaches the lowest point / highest point, the frequency change rate is equal to 0, and the speed of the phase modifier is controlled to be the speed value sampled when the frequency change rate is equal to 0. When the frequency recovers to the rated direction after reaching the extreme value, the rotor speed is directly controlled to be the speed value ω r0 , which is kept unchanged, so that the frequency is prevented from falling again due to the absorption of power during the speed recovery.

[0083] It can be seen that, in the embodiment of the application, when the frequency deviates from the rated frequency, the speed of the phase modifier is adaptively adjusted through the frequency change rate and the speed adjustment margin, so that the phase modifier emits or absorbs active power to provide inertia support. During the recovery of the frequency to the rated direction after the frequency reaches the highest point or the lowest point, the speed of the phase modifier is controlled to be the sampling value when the frequency change rate is equal to zero and kept unchanged, so that the phase modifier is prevented from absorbing power to cause the frequency to fall again during the speed recovery. The embodiment of the application improves the active frequency support capability of the energy storage type doubly-fed phase modifier.

[0084] As a possible implementation manner, the method further includes:

[0085] If the frequency does not satisfy the determination condition, it is determined whether the frequency is in a standard state, the standard state being that the frequency is equal to the rated frequency and the frequency change rate is equal to zero (i.e. df / dt = 0 and f = f f ). t n ).

[0086] The rotational speed of the phase modifier is controlled according to whether the frequency is in the standard state.

[0087] For example, the rotational speed of the phase modifier is controlled according to whether the frequency is in the standard state, including:

[0088] If the frequency is in the standard state, the rotational speed of the phase modifier is controlled to be the rated rotational speed.

[0089] If the frequency is not in the standard state, the rotational speed of the phase modifier is controlled to be the sampling value when the frequency change rate is equal to zero.

[0090] In order to facilitate understanding of the present scheme, Figure 3 a more detailed flowchart is given, including:

[0091] (1) obtaining the frequency f and the change rate df / dt of the power grid;

[0092] (2) determining whether the frequency is in the standard state (df / dt = 0 and f = f n ), if yes, entering step (3), otherwise entering step (4);

[0093] (3) controlling the rotational speed of the phase modifier to be the rated rotational speed, and returning to step (1);

[0094] (4) determining whether the frequency is far from the rated frequency ((df / dt < 0 and f ≤ f n ) or (df / dt > 0 and f ≥ f n )), if yes, entering step (5), otherwise entering step (8);

[0095] (5) calculating the rotational speed correction amount Δω r according to the rotational speed adjustment margin and the frequency change rate;

[0096] (6) controlling the rotational speed of the phase modifier to be the real-time rotational speed ω r superimposed with the rotational speed correction amount Δω r ;

[0097] (7) determining whether the frequency reaches the highest / lowest point (df / dt = 0), if yes, entering step (8), otherwise returning to step (5);

[0098] (8) controlling the rotational speed of the phase modifier to be the sampling value when the frequency change rate is equal to zero, and returning to step (1). ​

[0099] The frequency active support control method of the energy storage type doubly-fed phase modifier based on the speed self-adaptive adjustment has only speed control, does not need to switch the virtual inertia control and the speed control, has a simple control structure, and can effectively realize the frequency active support.

[0100] In order to verify the above method, an electric network system simulation platform as shown in the figure is built by the embodiment of the application, the system includes one 400MW synchronous motor, two active loads with a capacity of 400MW and 60MW respectively, a wind farm with a capacity of 40 sets of 1.5MW, and a 10MW energy storage type doubly-fed phase modifier. Figure 4 In the simulation system, the following settings are made: at the initial moment, the system is stably operated, and the phase modifier is operated at the rated speed; at 15s, 50MW of active load is put in, so that the system frequency is disturbed. The adaptive speed adjustment control parameters k1 and k2 of the phase modifier are set as 2 and 0.0001 respectively; the large coefficient virtual inertia control parameter k is set as 300, and the small coefficient virtual inertia control parameter k is set as 100; the minimum value of the rotor speed of the phase modifier is set as 0.7 times the rated speed.

[0101] In the frequency support process of the simulation system of the application, the energy storage type doubly-fed phase modifier uses the constant speed control, the active outer loop constant coefficient virtual inertia control, and the control method of the application respectively, and the operation results are as shown in the figure. Figure 5 to Figure 8 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 The operation results of the system frequency, the system frequency change rate, the active power of the phase modifier, and the rotor speed are respectively shown.

[0102] Figure 5 、 Figure 6 The operation results of the system frequency and the frequency change rate are shown. Compared with the small coefficient virtual inertia control method, the method of the application effectively suppresses the mutation of the frequency change rate, raises the minimum point of the frequency drop, and has a stronger frequency support capability; compared with the large coefficient virtual inertia control method, the method of the application has a similar minimum point of the frequency to the former, and further considers the speed adjustment margin and the size of the frequency change rate, so that the frequency mutation is more effectively suppressed at the initial frequency drop, the active power is reduced by reducing the speed change when reaching the minimum point of the frequency, and then the frequency recovery speed is accelerated, and the dynamic response characteristics of the system are enhanced. The correctness of the method of the application without switching the control structure and the effectiveness of the frequency active support are verified.

[0103] Figure 7 、 Figure 8 ​The running results of the active power emitted by the phase modifier and the rotor speed are shown. In the initial stage of frequency drop, due to the sharp drop of the frequency change rate, the rotor speed correction amount is relatively large, the method of the application can make the phase modifier emit relatively large active power immediately, and provide strong frequency support for the system. The rotor speed change of the control strategy of the application relative to the virtual inertia control method is larger, and the frequency modulation energy of the phase modifier is fully utilized by considering the rotor speed regulation margin, thereby proving the effectiveness of the method of the application which can actively support the system frequency in a large range of speed regulation.

[0104] It should be understood that the size of the serial number of each step in the above embodiment does not mean the order of execution, and the execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the application.

[0105] Figure 9 is a structural schematic diagram of the frequency active support control device 90 of the energy storage type double-fed phase modifier provided by the embodiment of the application, comprising:

[0106] The acquisition module 91 is configured to acquire the frequency and the frequency change rate of the power grid.

[0107] The judgment module 92 is configured to judge whether the frequency meets the determination condition of moving away from the rated frequency.

[0108] The control module 93 is configured to, if the frequency meets the determination condition, execute a rotor speed correction process: determining a rotor speed correction amount according to the frequency change rate and the rotor speed regulation margin; correcting the rotor speed of the phase modifier according to the rotor speed correction amount; judging whether the frequency reaches the highest point or the lowest point; if the frequency reaches the highest point or the lowest point, controlling the rotor speed of the phase modifier to be the sampling value when the frequency change rate is equal to zero; if the frequency does not reach the highest point or the lowest point, executing the rotor speed correction process again.

[0109] As a possible implementation manner, the judgment module 92 is specifically configured to:

[0110] if the frequency is less than or equal to the rated frequency and the frequency change rate is less than zero, it is determined that the frequency meets the determination condition of moving away from the rated frequency;

[0111] or, if the frequency is greater than or equal to the rated frequency and the frequency change rate is greater than zero, it is determined that the frequency meets the determination condition of moving away from the rated frequency.

[0112] As a possible implementation manner, the control module 93 is specifically configured to:

[0113] determine the rotor speed correction amount according to

[0114] In the formula, ω r,max and ω r,min are the maximum and minimum limits of the rotor speed of the phase modifier respectively.​r ωref is the reference value of the rotating speed of the phase modifier; df / dt is the frequency change rate; k1 and k2 are control coefficients; f n is the rated frequency.

[0115] As a possible implementation manner, the control module 93 is specifically configured to:

[0116] According to ω r,ref = ω r + Δω r determine the reference value of the rotating speed of the phase modifier; in the formula, ω r,ref is the reference value of the rotating speed of the phase modifier; ω r is the real-time rotating speed of the phase modifier, Δω r is the rotating speed correction amount.

[0117] According to the reference value of the rotating speed, control the rotating speed of the phase modifier.

[0118] As a possible implementation manner, the control module 93 is further configured to:

[0119] If the frequency does not satisfy the determination condition, it is determined whether the frequency is in a standard state, the standard state being that the frequency is equal to the rated frequency and the frequency change rate is equal to zero;

[0120] According to whether the frequency is in the standard state, control the rotating speed of the phase modifier.

[0121] As a possible implementation manner, the control module 93 is specifically configured to:

[0122] If the frequency is in the standard state, the rotating speed of the phase modifier is controlled to be the rated rotating speed.

[0123] As a possible implementation manner, the control module 93 is specifically configured to:

[0124] If the frequency is not in the standard state, the rotating speed of the phase modifier is controlled to be the sampling value when the frequency change rate is equal to zero.

[0125] It can be seen that, in the embodiment of the present application, when the frequency is far away from the rated frequency, the rotating speed of the phase modifier is adaptively adjusted through the frequency change rate and the rotating speed adjustment margin, so that the phase modifier emits or absorbs active power to provide inertia support. During the recovery of the frequency to the rated direction after the frequency reaches the highest point or the lowest point, by controlling the rotating speed of the phase modifier to be the sampling value when the frequency change rate is equal to zero and keeping it unchanged, the secondary frequency drop caused by the power absorption of the phase modifier during the rotating speed recovery can be avoided. The frequency active support capability of the energy storage type doubly-fed phase modifier is improved.

[0126] Figure 10 is a schematic diagram of an electronic device 100 provided by an embodiment of the present application. As shown in FIG. 1, the electronic device 100 includes a processor 10, a memory 20, a communication interface 30, and a power supply 40. Figure 10As shown, the electronic device 100 of this embodiment includes a processor 101, a memory 102, and a computer program 103 stored in the memory 102 and executable on the processor 101, such as a frequency active support control program of the energy storage type doubly-fed synchronous generator. The processor 101 implements the steps in each of the above-described frequency active support control method embodiments of the energy storage type doubly-fed synchronous generator when executing the computer program 103, such as Figure 2 the steps S201 to S204. Alternatively, the processor 101 implements the functions of each module in each of the above-described apparatus embodiments when executing the computer program 103, such as Figure 9 the functions of the modules 91 to 93.

[0127] For example, the computer program 103 can be divided into one or more modules / units, which are stored in the memory 102 and executed by the processor 101 to complete the present application. The one or more modules / units can be a series of computer program instruction segments capable of completing a specific function, which are used to describe the execution process of the computer program 103 in the electronic device 100.

[0128] The electronic device 100 can be a desktop computer, a notebook computer, a palm computer, a cloud server, and other computing devices. The electronic device 100 can include, but is not limited to, the processor 101 and the memory 102. Those skilled in the art can understand that Figure 10 The electronic device 100 is only an example and does not constitute a limitation on the electronic device 100, which can include more or fewer components than those shown, or combine certain components, or include different components, such as the electronic device 100 can also include an input / output device, a network access device, a bus, etc.

[0129] The processor 101 can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic components, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0130] The memory 102 can be an internal storage unit of the electronic device 100, for example, a hard disk or a memory of the electronic device 100. The memory 102 can also be an external storage device of the electronic device 100, for example, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the electronic device 100. Further, the memory 102 can include both the internal storage unit and the external storage device of the electronic device 100. The memory 102 is used to store the computer program and other programs and data required by the electronic device 100. The memory 102 can also be used to temporarily store data that has been output or will be output.

[0131] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above functional units and modules is exemplified, and in actual application, the above functions can be completed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiment can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit, and the integrated unit can be realized in the form of hardware or software. In addition, the specific names of each functional unit and module are only for easy distinction, and do not limit the protection scope of the application. The specific working process of the units and modules in the system can refer to the corresponding process in the foregoing method embodiments, which will not be described here.

[0132] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described or recorded in detail in a certain embodiment can be referred to the related description of other embodiments.

[0133] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized in electronic hardware or a combination of computer software and electronic hardware. Whether the functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. A person skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0134] In the embodiments of the present application, it should be understood that the disclosed apparatus / equipment and method can be implemented in other manners. For example, the described apparatus / equipment embodiments are merely schematic. For example, the division of the modules or units is merely logical function division. There can be another division manner for the actual implementation, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections can be indirect couplings or communication connections through some interfaces, devices or units, and can be in electrical, mechanical or other forms.

[0135] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e., can be located in one place, or can be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiments.

[0136] In addition, each functional unit in the various embodiments of the present application can be integrated into a processing unit, or each unit can be a physically independent unit, or two or more units can be integrated into a unit. The integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

[0137] The integrated module / unit, if implemented in the form of a software functional unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on this understanding, all or part of the flow of the above-mentioned embodiment methods can be implemented by a computer program instructing related hardware to complete, and the computer program can be stored in a computer readable storage medium. When the processor executes the computer program, the steps of each method embodiment described above can be implemented. The computer program includes computer program code, which can be in the form of source code, object code, executable file or some intermediate form. The computer readable medium can include any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0138] The above-described embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A frequency active support control method for an energy storage type double-fed phase shifter, characterized in that: include: Obtain the frequency and frequency change rate of the power grid; Determining whether the frequency satisfies a condition of being far from the rated frequency; If the frequency satisfies the determination condition, a speed correction process is executed: a speed correction amount is determined according to the frequency change rate and the speed adjustment margin; and the speed of the condenser is corrected according to the speed correction amount. Determine whether the frequency reaches the highest point or the lowest point; if the frequency reaches the highest point or the lowest point, control the rotational speed of the phase regulator to be the sampling value when the frequency change rate is zero; If the frequency does not reach the highest point or the lowest point, the speed correction process is performed again; The determining whether the frequency satisfies a condition of being far from the rated frequency includes: If the frequency is less than or equal to the rated frequency, and the frequency change rate is less than zero, it is determined that the frequency meets the determination condition of being far from the rated frequency; Alternatively, if the frequency is greater than or equal to the rated frequency and the frequency change rate is greater than zero, it is determined that the frequency meets the determination condition of being far from the rated frequency; The determining of the speed correction amount according to the frequency change rate and the speed adjustment margin includes: according to Determine the speed correction amount; Where, ω r,max and ω r,min They are the maximum and minimum speed limits of the condenser respectively; ω r is the real-time speed of the condenser; d f / d t is the frequency change rate; k 1 and k 2 is the control coefficient; f n is the rated frequency; The step of correcting the rotational speed of the condenser according to the rotational speed correction value includes: according to Determine the speed reference value of the condenser; where, ω r,ref is the speed reference value of the condenser; ω r is the real-time speed of the condenser, Δ ω r is the speed correction; The speed of the phase regulator is controlled according to the speed reference value.

2. The frequency active support control method for the energy storage type double-fed phase shifter according to claim 1, characterized in that: Also includes: If the frequency does not meet the determination condition, determining whether the frequency is in a standard state, the standard state being: the frequency is equal to the rated frequency, and the frequency change rate is equal to zero; The rotation speed of the phase regulator is controlled according to whether the frequency is in a standard state.

3. The frequency active support control method for the energy storage type double-fed phase shifter according to claim 2, characterized in that: The controlling of the rotation speed of the phase regulator according to whether the frequency is in a standard state includes: If the frequency is in a standard state, the speed of the phase regulator is controlled to be the rated speed.

4. The method for active frequency support control of an energy storage type double-fed phase shifter according to claim 2, wherein: The controlling of the rotation speed of the phase regulator according to whether the frequency is in a standard state includes: If the frequency is not in the standard state, the rotational speed of the phase regulator is controlled to be a sampling value when the frequency change rate is equal to zero.

5. An energy storage type double-fed phase condenser frequency active support control device, characterized in that: include: An acquisition module, used to obtain the frequency and frequency change rate of the power grid; A judging module, configured to judge whether the frequency satisfies a judgment condition of being far from the rated frequency; A control module is configured to execute a speed correction process if the frequency satisfies the determination condition: determine a speed correction amount according to the frequency change rate and the speed adjustment margin; and correct the speed of the condenser according to the speed correction amount; Determine whether the frequency reaches the highest point or the lowest point; if the frequency reaches the highest point or the lowest point, control the rotational speed of the phase regulator to be the sampling value when the frequency change rate is zero; If the frequency does not reach the highest point or the lowest point, the speed correction process is performed again; The determining whether the frequency satisfies a condition of being far from the rated frequency includes: If the frequency is less than or equal to the rated frequency, and the frequency change rate is less than zero, it is determined that the frequency meets the determination condition of being far from the rated frequency; Alternatively, if the frequency is greater than or equal to the rated frequency and the frequency change rate is greater than zero, it is determined that the frequency meets the determination condition of being far from the rated frequency; The determining of the speed correction amount according to the frequency change rate and the speed adjustment margin includes: according to Determine the speed correction amount; Where, ω r,max and ω r,min They are the maximum and minimum speed limits of the condenser respectively; ω r is the real-time speed of the condenser; d f / d t is the frequency change rate; k 1 and k 2 is the control coefficient; f n is the rated frequency; The step of correcting the rotational speed of the condenser according to the rotational speed correction value includes: according to Determine the speed reference value of the condenser; where, ω r,ref is the speed reference value of the condenser; ω r is the real-time speed of the condenser, Δ ω r is the speed correction; The speed of the phase regulator is controlled according to the speed reference value.

6. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 4 are implemented.

7. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 4 are implemented.

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