Active support control method and device for frequency of energy storage type double-fed phase modifier

Abstract

The invention is suitable for the technical field of electric power, and provides an energy storage type double-fed phase modifier frequency active support control method and device, and the method comprises the steps: obtaining the frequency and the frequency change rate of a power grid; judging whether the frequency meets a judgment condition away from the rated frequency or not; if the frequency meets the judgment condition, executing a rotating speed correction process: determining a rotating speed correction amount according to the frequency change rate and the rotating speed adjustment margin; correcting the rotating speed of the phase modifier according to the rotating 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 rotating speed of the phase modifier 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 executed again. According to the invention, the active frequency supporting capability of the energy storage type double-fed phase modifier can be improved.

Description

Technical Field

[0001] The present invention belongs to the field of electric power technology, and in particular relates to a frequency active support control method and device for an energy storage type double-fed phase regulator. Background Art

[0002] In recent years, the scale of grid connection of new energy and power electronic equipment has been increasing, and synchronous machines have been gradually replaced by new energy power generation equipment, resulting in a downward trend in the inertia and voltage support capacity of the power grid system. At present, synchronous condensers 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] Conventional synchronous phase modulation has small inherent mechanical inertia, little effective energy storage, and insufficient transient active support capacity, which cannot meet the frequency support requirements of high-proportion new energy power systems. Energy storage type doubly fed phase condenser is a device that applies doubly fed induction motors to phase condensers. It adds a coaxial flywheel on the rotor side to increase the mechanical rotation inertia of the unit, and can present a virtual inertia larger than the inherent mechanical inertia of the synchronous phase condenser through a wide range of variable speed operation, providing frequency support capabilities for the system.

[0004] At present, the main method for active frequency support of energy storage doubly fed phase condensers is virtual inertia control, that is, adding a virtual inertia link on the basis of active power control. This method has the following shortcomings: (1) Virtual inertia control cannot control the speed. The phase condenser needs to switch to speed control and perform smoothing in steady state, and the control structure is relatively complex; (2) Virtual inertia control is difficult to take into account both frequency stability and dynamic characteristics: if the virtual inertia coefficient is too small, the frequency support effect is not obvious; if the virtual inertia coefficient is too large, the system dynamic response slows down or even oscillation problems occur. Summary of the invention

[0005] In view of this, an embodiment of the present invention provides a method and device for active frequency support control of an energy storage type double-fed phase regulator, so as to improve the active frequency support capability of the energy storage type double-fed phase regulator.

[0006] A first aspect of an embodiment of the present invention provides a frequency active support control method for an energy storage type double-fed phase condenser, comprising:

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

[0008] Determining whether the frequency satisfies a determination condition of being far from the rated frequency;

[0009] If the frequency satisfies the determination condition, a speed correction process is performed: a speed correction amount is determined according to the frequency change rate and the speed adjustment margin; and the speed of the phase regulator is corrected according to the speed correction amount;

[0010] 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 speed of the phase regulator 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, execute the speed correction process again.

[0011] In combination with the first aspect, in a possible implementation manner of the first aspect, the determining whether the frequency satisfies a determination condition of being far from a rated frequency includes:

[0012] 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;

[0013] 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 being far from the rated frequency.

[0014] In combination with the first aspect, in a possible implementation manner of the first aspect, determining the speed correction amount according to the frequency change rate and the speed adjustment margin includes:

[0015] according to Determine the speed correction amount;

[0016] In the formula, ω r,max and ω r,min are the maximum and minimum speed limits of the condenser respectively; ω r is the real-time speed of the condenser; df / dt is the frequency change rate; k1 and k2 are control coefficients; f n is the rated frequency.

[0017] In combination with the first aspect, in a possible implementation manner of the first aspect, the correcting the rotation speed of the phase regulator according to the rotation speed correction amount includes:

[0018] According to ω r,ref =ω r +Δω r Determine the speed reference value of the phase regulator; where ω r,ref is the speed reference value of the condenser; ω r is the real-time speed of the condenser, Δω r is the speed correction value.

[0019] The speed of the phase regulator is controlled according to the speed reference value.

[0020] In combination with the first aspect, in a possible implementation manner of the first aspect, the method further includes:

[0021] If the frequency does not meet the determination condition, it is determined whether the frequency is in a standard state, wherein the standard state is: the frequency is equal to the rated frequency, and the frequency change rate is zero;

[0022] The rotation speed of the phase regulator is controlled according to whether the frequency is in a standard state.

[0023] In combination with the first aspect, in a possible implementation manner of the first aspect, controlling the rotation speed of the phase condenser according to whether the frequency is in a standard state includes:

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

[0025] In combination with the first aspect, in a possible implementation manner of the first aspect, controlling the rotation speed of the phase condenser according to whether the frequency is in a standard state includes:

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

[0027] A second aspect of an embodiment of the present invention provides an energy storage type double-fed phase condenser frequency active support control device, comprising:

[0028] An acquisition module, used for acquiring the frequency and frequency change rate of the power grid;

[0029] A judging module, used to judge whether the frequency satisfies a judgment condition of being far away from the rated frequency;

[0030] A control module, 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 phase regulator according to the speed correction amount;

[0031] 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 speed of the phase regulator 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, execute the speed correction process again.

[0032] In conjunction with 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 meets the determination condition of being far 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 being far from the rated frequency.

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

[0036] according to Determine the speed correction amount;

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

[0038] In conjunction with 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 Determine the speed reference value of the phase regulator; where ω r,ref is the speed reference value of the condenser; ω r is the real-time speed of the condenser, Δω r is the speed correction value.

[0040] The speed of the phase regulator is controlled according to the speed reference value.

[0041] In conjunction with 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 meet the determination condition, it is determined whether the frequency is in a standard state, wherein the standard state is: the frequency is equal to the rated frequency, and the frequency change rate is zero;

[0043] The rotation speed of the phase regulator is controlled according to whether the frequency is in a standard state.

[0044] In conjunction with 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 a standard state, the speed of the phase regulator is controlled to be the rated speed.

[0046] In conjunction with 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, the rotation speed of the phase regulator is controlled to be a sampling value when the frequency change rate is equal to zero.

[0048] A third aspect of an embodiment of the present invention provides 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 in the first aspect or any one of the implementations of the first aspect are implemented.

[0049] A fourth aspect of an embodiment of the present invention provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the steps of the method in the above-mentioned first aspect or any one of the implementation methods of the first aspect.

[0050] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0051] When the frequency is far away from the rated frequency, the embodiment of the present invention adaptively adjusts the speed of the phase regulator through the frequency change rate and the speed adjustment margin, so that the phase regulator emits or absorbs active power to provide inertia support. During the recovery period in the rated direction after the frequency reaches the highest point or the lowest point, by controlling the speed of the phase regulator to the sampling value when the frequency change rate is equal to zero and keeping it unchanged, it is possible to avoid the phase regulator absorbing power during the speed recovery period, resulting in a secondary drop in frequency. The embodiment of the present invention improves the frequency active support capability of the energy storage type double-fed phase regulator. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0053] Figure 1 Schematic diagram of an application scenario of the frequency active support control method of the energy storage type double-fed phase condenser provided in an embodiment of the present invention;

[0054] Figure 2 The following is a schematic diagram of the implementation process of the frequency active support control method of the energy storage type double-fed phase regulator provided by the embodiment of the present invention. Figure 1 ;

[0055] Figure 3 The following is a schematic diagram of the implementation process of the frequency active support control method of the energy storage type double-fed phase regulator provided by the embodiment of the present invention. Figure 2 ;

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

[0057] Figure 5is a schematic diagram of the operating results of the system frequency provided by an embodiment of the present invention;

[0058] Figure 6 is a schematic diagram of the operating results of the system frequency change rate provided by an embodiment of the present invention;

[0059] Figure 7 It is a schematic diagram of the operating results of the active power of the phase regulator provided by the embodiment of the present invention;

[0060] Figure 8 is a schematic diagram of the operating results of the rotor speed provided by an embodiment of the present invention;

[0061] Fig. 9 It is a structural schematic diagram of a frequency active support control device for an energy storage type double-fed phase condenser provided in an embodiment of the present invention;

[0062] Fig.10 It is a schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0063] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0064] In order to illustrate the technical solution of the present invention, a specific embodiment is provided below for illustration.

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

[0066] like Figure 1 As shown, the phase-converter frequency-supported control rotor-side converter adopts a dual-loop vector control structure, the inner loop adopts current control, and the outer loop adopts speed control, wherein the frequency change 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 double-fed phase regulator always adopts speed control, where the speed reference value ω r,ref Based on the speed adjustment margin and the system frequency change rate, it is adaptively generated, and there is no need to switch between speed and virtual inertia control. r,ref Its actual value ω r As input, the control reference value i of the current inner loop is obtained through the PI regulation module.rd,ref .

[0068] Figure 2 The present invention is a schematic diagram of the implementation process of the energy storage type double-fed phase condenser frequency active support control method proposed in the embodiment of the present invention, including:

[0069] Step S201, obtaining the frequency f and frequency change rate df / dt of the power grid.

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

[0071] Step S202, determining whether the frequency satisfies the determination condition of being far away from the rated frequency.

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

[0073] Step S203: If the frequency meets the judgment condition, the speed correction process is executed: the speed correction amount Δω is determined according to the frequency change rate and the speed adjustment margin. r ; According to the speed correction amount, the speed of the phase regulator is corrected. Among them, the speed adjustment margin can be a real-time dynamic value. During the support process, the speed of the phase regulator changes continuously, and the speed adjustment margin also changes accordingly.

[0074] In this 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 speed limits of the condenser respectively; ω r is the real-time speed of the condenser; 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 regulator reduces speed to generate active power to provide frequency support, and the speed regulation margin is (ω r,min -ω r ); When the frequency increases, the phase regulator increases 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 larger the absolute value of the frequency change rate is, the closer it is to 1, so that the speed correction amount of the phase regulator approaches the maximum speed adjustment margin.

[0078] Then, according to ω r,ref =ω r +Δω r Determine the speed reference value of the phase regulator; where ω r,ref is the speed reference value of the condenser; ω r is the real-time speed of the condenser, Δω r is the speed correction value.

[0079] Finally, the speed reference value is used as the speed target control variable to control the speed of the phase regulator.

[0080] It can be seen that during the frequency change process, as the support process proceeds, the speed of the phase regulator continues to rise / fall, thereby absorbing / releasing active power, thereby suppressing the frequency change of the system.

[0081] Step S204, 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 speed of the phase regulator 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, execute the speed correction process of step S203 again until the frequency reaches the highest point or the lowest point, and control the speed of the phase regulator to be the sampling value when the frequency change rate is equal to zero.

[0082] Here, when the frequency reaches the lowest / highest point, the frequency change rate is equal to 0, and the speed control of the phase regulator is: keep the speed value sampled when the frequency change rate is equal to 0. When the frequency reaches the maximum value and recovers to the rated direction, the rotor speed is directly controlled at the speed value ω through the speed outer loop. r0 Keeping it unchanged can avoid the secondary drop in frequency caused by power absorption during speed recovery.

[0083] It can be seen that when the frequency is far away from the rated frequency, the embodiment of the present invention adaptively adjusts the speed of the phase regulator through the frequency change rate and the speed adjustment margin, so that the phase regulator emits or absorbs active power to provide inertia support. During the recovery period in the rated direction after the frequency reaches the highest or lowest point, by controlling the speed of the phase regulator to the sampling value when the frequency change rate is equal to zero and keeping it unchanged, it is possible to avoid the phase regulator absorbing power during the speed recovery period, resulting in a secondary drop in frequency. The embodiment of the present invention improves the frequency active support capability of the energy storage type double-fed phase regulator.

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

[0085] If the frequency does not meet the judgment condition, it is determined whether the frequency is in the standard state. The standard state is: the frequency is equal to the rated frequency, and the frequency change rate is zero (i.e. d f / d t =0 and f=f n );

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

[0087] Exemplarily, controlling the rotation speed of the phase regulator according to whether the frequency is in a standard state includes:

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

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

[0090] According to the contents in the above embodiments, in order to facilitate understanding of this solution, Figure 3 A more detailed flow chart is given, including:

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

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

[0093] (3) The condenser speed is controlled to the rated speed and the process returns to step (1);

[0094] (4) Determine 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, go to step (5), otherwise go to step (8);

[0095] (5) Calculate the speed correction value Δω based on the speed adjustment margin and frequency change rate r ;

[0096] (6) The condenser speed is controlled to the real-time speed ω r Superimposed speed correction Δω r ;

[0097] (7) Determine whether the frequency reaches the highest / lowest point (df / dt=0). If so, proceed to step (8); otherwise, return to step (5);

[0098] (8) The condenser speed is controlled to be the sampling value when the frequency change rate is equal to 0, and the process returns to step (1).

[0099] The above-mentioned energy storage type doubly-fed phase condenser frequency active support control method based on speed adaptive regulation proposed in this embodiment only needs speed control for the phase condenser throughout the whole process, and there is no need to switch between virtual inertia control and speed control. The control structure is simple and can effectively realize active frequency support.

[0100] In order to verify the above method, the embodiment of the present invention builds the following Figure 4 The power grid system simulation platform shown in the figure includes a 400MW synchronous motor, two active loads of 400MW and 60MW respectively, a wind farm with an installed capacity of 40 units × 1.5MW / unit, and a storage-type double-fed phase regulator with a rated active power of 10MW. The following settings are made in the simulation system: at the initial moment, the system operates stably and the phase regulator operates at the rated speed state; at 15s, a 50MW active load is put into operation to disturb the system frequency. The phase regulator adaptive speed adjustment control parameters k1 and k2 are set to 2 and 0.0001; the large coefficient virtual inertia control parameter k is 300, and the small coefficient virtual inertia control parameter k is 100; the minimum limit of the phase regulator rotor speed is 0.7 times the rated speed.

[0101] The simulation system of the present invention adopts constant speed control, active outer loop constant coefficient virtual inertia control, and the control method proposed by the present invention in the frequency support process. The operation results are as follows: Figures 5 to 8 shown. Figure 5 , Figure 6 , Figure 7 , Figure 8 The operating results of system frequency, system frequency change rate, phase regulator active power and rotor speed are displayed respectively.

[0102] Figure 5 , Figure 6 The operating results of the system frequency and frequency change rate are displayed. Compared with the small coefficient virtual inertia control method, the method of the present invention effectively suppresses the sudden change of the frequency change rate, and raises the lowest point of the frequency drop, and the frequency support capability is stronger; compared with the large coefficient virtual inertia control method, the method of the present invention is close to the lowest frequency point of the former, and further takes into account the speed regulation margin and the frequency change rate, so it is more effective to suppress the frequency mutation at the beginning of the frequency drop, and when the frequency reaches the lowest point, it reduces the speed change to reduce the active power output, thereby accelerating the frequency recovery speed and enhancing the dynamic response characteristics of the system. In summary, the correctness of the method of the present invention without switching the control structure and the effectiveness of active frequency support are verified.

[0103] Figure 7 , Figure 8The operating results of the active power and rotor speed of the phase regulator are shown. In the early stage of frequency drop, due to the sudden drop in the frequency change rate, the speed correction is large. The method of the present invention can enable the phase regulator to immediately generate a large amount of active power and provide strong frequency support for the system. Compared with the virtual inertia control method, the control strategy of the present invention has a greater change in rotor speed. By considering the speed regulation margin, the frequency modulation energy of the phase regulator is fully utilized, thereby proving the effectiveness of the method of the present invention in large-scale speed regulation to actively support the system frequency.

[0104] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0105] Fig. 9 : is a structural diagram of an energy storage type double-fed phase condenser frequency active support control device 90 provided in an embodiment of the present invention, comprising:

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

[0107] The judging module 92 is used to judge whether the frequency satisfies the judging condition of being far away from the rated frequency.

[0108] The control module 93 is used to execute the speed correction process if the frequency meets the judgment conditions: determine the speed correction amount according to the frequency change rate and the speed adjustment margin; correct the speed of the phase regulator 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 speed of the phase regulator to 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, execute the speed correction process again.

[0109] As a possible implementation manner, the determination 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 being far from the rated frequency;

[0111] 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 being far from the rated frequency.

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

[0113] according to Determine the speed correction amount;

[0114] In the formula, ω r,max and ω r,min are the maximum and minimum speed limits of the condenser respectively; ωr is the real-time speed of the condenser; 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 used for:

[0116] According to ω r,ref =ω r +Δω r Determine the speed reference value of the phase regulator; where ω r,ref is the speed reference value of the condenser; ω r is the real-time speed of the condenser, Δω r is the speed correction value.

[0117] According to the speed reference value, the speed of the phase regulator is controlled.

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

[0119] If the frequency does not meet the judgment condition, it is determined whether the frequency is in the standard state. The standard state is: the frequency is equal to the rated frequency, and the frequency change rate is zero;

[0120] The speed of the phase regulator is controlled according to whether the frequency is in the standard state.

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

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

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

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

[0125] It can be seen that when the frequency is far away from the rated frequency, the embodiment of the present invention adaptively adjusts the speed of the phase regulator through the frequency change rate and the speed adjustment margin, so that the phase regulator emits or absorbs active power to provide inertia support. During the recovery period in the rated direction after the frequency reaches the highest or lowest point, by controlling the speed of the phase regulator to the sampling value when the frequency change rate is equal to zero and keeping it unchanged, it is possible to avoid the phase regulator absorbing power during the speed recovery period, resulting in a secondary drop in frequency. The embodiment of the present invention improves the frequency active support capability of the energy storage type double-fed phase regulator.

[0126] Fig.10 FIG. 1 is a schematic diagram of an electronic device 100 provided by an embodiment of the present invention. Fig.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 an energy storage type double-fed phase condenser frequency active support control program. When the processor 101 executes the computer program 103, the steps in the above-mentioned embodiments of the energy storage type double-fed phase condenser frequency active support control method are implemented, such as Figure 2 Alternatively, when the processor 101 executes the computer program 103, the functions of each module in the above-mentioned device embodiments are realized, for example, Fig. 9 The functions of modules 91 to 93 are shown.

[0127] Exemplarily, the computer program 103 may be divided into one or more modules / units, which are stored in the memory 102 and executed by the processor 101 to implement the present invention. The one or more modules / units may be a series of computer program instruction segments capable of implementing specific functions, which are used to describe the execution process of the computer program 103 in the electronic device 100.

[0128] The electronic device 100 may be a computing device such as a desktop computer, a notebook, a PDA, or a cloud server. The electronic device 100 may include, but is not limited to, a processor 101 and a memory 102. Those skilled in the art will appreciate that Fig.10 It is only an example of the electronic device 100 and does not constitute a limitation of the electronic device 100. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the electronic device 100 may also include input and output devices, network access devices, buses, etc.

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

[0130] The memory 102 may be an internal storage unit of the electronic device 100, such as a hard disk or memory of the electronic device 100. The memory 102 may also be an external storage device of the electronic device 100, such as 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 may also include both an internal storage unit of the electronic device 100 and an external storage device. The memory 102 is used to store the computer program and other programs and data required by the electronic device 100. The memory 102 may also be used to temporarily store data that has been output or is to be output.

[0131] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0132] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0133] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0134] In the embodiments provided by the present invention, it should be understood that the disclosed devices / electronic devices and methods can be implemented in other ways. For example, the device / electronic device embodiments described above are only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0135] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0136] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0137] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0138] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A frequency active support control method for an energy storage type double-fed phase condenser, characterized in that: include: Obtain the frequency and frequency change rate of the power grid; Determining whether the frequency satisfies a determination condition of being far from the rated frequency; If the frequency satisfies the determination condition, a speed correction process is performed: a speed correction amount is determined according to the frequency change rate and the speed adjustment margin; and the speed of the phase regulator 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 speed of the phase regulator 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, execute the speed correction process again.

2. The frequency active support control method of the energy storage type double-fed phase condenser according to claim 1 is characterized in that: The determining whether the frequency satisfies a determination 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 satisfies the determination condition of being far from the rated frequency.

3. The frequency active support control method of the energy storage type double-fed phase condenser according to claim 1, characterized in that: Determining the speed correction amount according to the frequency change rate and the speed adjustment margin includes: according to Determine the speed correction amount; In the formula, ω r,max and ω r,min are the maximum and minimum speed limits of the condenser respectively; ω r is the real-time speed of the phase regulator; df / dt is the frequency change rate; k1 and k2 are control coefficients; f n is the rated frequency.

4. The frequency active support control method of the energy storage type double-fed phase condenser according to claim 1, characterized in that: The step of correcting the rotation speed of the phase regulator according to the rotation speed correction amount includes: According to ω r,ref =ω r +Δω r Determine the speed reference value of the phase regulator; where ω r,ref is the speed reference value of the condenser; ω r is the real-time speed of the condenser, Δω r is the speed correction value. The speed of the phase regulator is controlled according to the speed reference value.

5. The frequency active support control method of the energy storage type double-fed phase condenser according to any one of claims 1 to 4, characterized in that: Also includes: If the frequency does not meet the determination condition, it is determined whether the frequency is in a standard state, wherein the standard state is: the frequency is equal to the rated frequency, and the frequency change rate is zero; The rotation speed of the phase regulator is controlled according to whether the frequency is in a standard state.

6. The frequency active support control method of the energy storage type double-fed phase condenser according to claim 5, characterized in that: The step of controlling the rotation speed of the phase regulator according to whether the frequency is in a standard state comprises: If the frequency is in a standard state, the speed of the phase regulator is controlled to be the rated speed.

7. The frequency active support control method of the energy storage type double-fed phase condenser according to claim 5, characterized in that: The step of controlling the rotation speed of the phase regulator according to whether the frequency is in a standard state comprises: If the frequency is not in the standard state, the rotation speed of the phase regulator is controlled to be a sampling value when the frequency change rate is equal to zero.

8. An energy storage type double-fed phase condenser frequency active support control device, characterized in that: include: An acquisition module, used for acquiring the frequency and frequency change rate of the power grid; A judging module, used to judge whether the frequency satisfies a judgment condition of being far away from the rated frequency; A control module, 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 phase regulator 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 speed of the phase regulator 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, execute the speed correction process again.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. 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 7 are implemented.

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