Active frequency modulation control method and device of energy storage converter and electronic equipment

Abstract

The invention discloses an active frequency modulation control method and device of an energy storage converter, electronic equipment and a readable storage medium. The active frequency modulation control method of the energy storage converter comprises the following steps: acquiring the real-time frequency of a power grid connected with the energy storage converter; determining a first active frequency modulation coefficient according to the difference value between the rated frequency and the real-time frequency of the power grid, and determining a second active frequency modulation coefficient according to the difference value between the rated frequency and the real-time frequency of the power grid and a received active power instruction sent by an energy management system; and determining an active power compensation value of the energy storage converter according to the first active frequency modulation coefficient and the second active frequency modulation coefficient. In the application, the active frequency modulation coefficient can be automatically adjusted according to the current active power instruction of the energy storage converter and the change direction of the power grid frequency, so that the triggering of power instruction amplitude limiting can be avoided, the capacity of the energy storage converter can be fully utilized, and the supporting effect of the energy storage converter on the power grid is fully exerted.

Description

Technical Field

[0001] The present application belongs to the technical field of power grid frequency control, and in particular, relates to an active frequency modulation control method, device and electronic equipment of an energy storage converter. Background Art

[0002] The grid-type energy storage converter needs to have the function of active frequency modulation. When the grid frequency drops, the energy storage converter needs to increase the output active power. When the grid frequency increases, the energy storage converter needs to reduce the output active power. In the current grid-type energy storage converter, the active frequency modulation coefficient is a fixed value. When the active frequency modulation coefficient is large, it is easy to trigger power limiting, and the damping effect will be enhanced, resulting in a slower power response speed; when the active frequency modulation coefficient is small, the power of active frequency modulation is small, the power support for the grid is weak, and the capacity of the energy storage converter is not fully utilized. Summary of the invention

[0003] In view of this, the present application provides an active frequency modulation control method, device and electronic equipment for an energy storage converter, which can solve the problem in the prior art that the energy storage converter has limited regulation capability and cannot adapt well to grid fluctuations. In a first aspect, the present application provides an active frequency modulation control method for an energy storage converter, the method comprising the following steps: Obtaining the real-time frequency of the power grid to which the energy storage converter is connected; Determine a first active frequency modulation coefficient according to a difference between a rated frequency and a real-time frequency of the power grid, and determine a second active frequency modulation coefficient according to the difference between the rated frequency and the real-time frequency of the power grid and an active power instruction received from an energy management system; An active power compensation value of the energy storage converter is determined according to the first active frequency modulation coefficient and the second active frequency modulation coefficient. Optionally, the step of determining the first active frequency modulation coefficient according to the difference between the rated frequency and the real-time frequency of the power grid includes: Determining a target frequency difference according to a difference between a rated frequency and a real-time frequency of the power grid; A first active frequency modulation coefficient is determined according to the target frequency difference and the rated frequency of the power grid. Optionally, the step of determining the target frequency difference according to the difference between the rated frequency and the real-time frequency of the power grid includes: If the difference between the rated frequency and the real-time frequency of the power grid is within the frequency regulation dead zone, determining that the target frequency difference is zero; If the difference between the rated frequency and the real-time frequency of the power grid is not within the frequency regulation dead zone, the target frequency difference is determined to be the difference between the rated frequency and the real-time frequency of the power grid. Optionally, the step of determining the second active frequency modulation coefficient according to the difference between the rated frequency and the real-time frequency of the power grid and the received active power instruction sent by the energy management system includes: According to the difference between the rated frequency and the real-time frequency of the power grid, determining the frequency modulation interval corresponding to the difference; According to the frequency modulation interval corresponding to the difference and the received active power instruction sent by the energy management system, a second active frequency modulation coefficient corresponding to the frequency modulation interval is determined. Optionally, the step of determining a second active frequency modulation coefficient corresponding to the frequency modulation interval according to the frequency modulation interval corresponding to the difference and the received active power instruction sent by the energy management system includes: If the difference between the rated frequency and the real-time frequency of the power grid is within the first frequency modulation interval, the second active frequency modulation coefficient is determined according to the difference between the rated frequency and the real-time frequency of the power grid, the active power value in the active power instruction, the rated power of the energy storage converter and the preset active frequency modulation coefficient; If the difference between the rated frequency and the real-time frequency of the power grid is within the second frequency modulation interval or the third frequency modulation interval, the second active frequency modulation coefficient is determined according to the active power value in the active power instruction, the rated power of the energy storage inverter and the preset active frequency modulation coefficient, wherein the second frequency modulation interval is an interval composed of values ​​less than the lower limit of the first frequency modulation interval, and the third frequency modulation interval is an interval composed of values ​​greater than the upper limit of the first frequency modulation interval. Optionally, if the difference between the rated frequency and the real-time frequency of the power grid is within the first frequency modulation interval, the step of determining the second active frequency modulation coefficient is calculated using the following formula according to the difference between the rated frequency and the real-time frequency of the power grid, the active power value in the active power instruction, the rated power of the energy storage converter, and the preset active frequency modulation coefficient: Φ=arctan(K f_set / P n ); K f =K f_set -P ref tanθ; Among them, K f is the second active frequency modulation coefficient, K f_set is the preset active frequency modulation coefficient, P n is the rated power of the energy storage converter, Δf is the difference between the rated frequency and the real-time frequency of the power grid, P ref is the active power value in the active power instruction. Optionally, if the difference between the rated frequency and the real-time frequency of the power grid is within the second frequency modulation interval or the third frequency modulation interval, the step of determining the second active frequency modulation coefficient according to the active power value in the active power instruction, the rated power of the energy storage converter and the preset active frequency modulation coefficient includes: If the difference between the rated frequency and the real-time frequency of the power grid is within the third frequency regulation interval, the formula is used: determining the second active frequency modulation coefficient; If the difference between the rated frequency and the real-time frequency of the power grid is within the second frequency regulation interval, the formula is used: determining the second active frequency modulation coefficient; Among them, K f is the second active frequency modulation coefficient, K f_set is the preset active frequency modulation coefficient, P n is the rated power of the energy storage converter, P ref is the active power value in the active power instruction. Optionally, the first frequency modulation interval includes the frequency modulation dead zone. Optionally, the step of determining the active power compensation value of the energy storage converter according to the first active frequency modulation coefficient and the second active frequency modulation coefficient includes: The product of the first active frequency modulation coefficient and the second active frequency modulation coefficient is multiplied by the rated power of the energy storage converter to obtain the active power compensation value of the energy storage converter. Optionally, after the step of determining the active power compensation value of the energy storage converter according to the first active frequency modulation coefficient and the second active frequency modulation coefficient, the method further includes: Taking the sum of the active power value in the active power instruction and the active power compensation value as the target active power of the energy storage converter; Active power control is performed on the energy storage converter according to the target active power value to achieve grid frequency regulation. In a second aspect, the present application further provides an active frequency modulation control device for an energy storage converter, the device comprising: An acquisition module, used to acquire the real-time frequency of the power grid to which the energy storage converter is connected; A determination module, configured to determine a first active frequency modulation coefficient according to a difference between a rated frequency and a real-time frequency of the power grid, and to determine a second active frequency modulation coefficient according to the difference between the rated frequency and the real-time frequency of the power grid and an active power instruction received from an energy management system; A compensation module is used to determine the active power compensation value of the energy storage converter according to the first active frequency modulation coefficient and the second active frequency modulation coefficient. Optionally, the determining module includes: A first determining unit, configured to determine a target frequency difference according to a difference between a rated frequency and a real-time frequency of the power grid; The second determining unit is used to determine a first active frequency modulation coefficient according to the target frequency difference and the rated frequency of the power grid. Optionally, the first determining unit includes: A first determination subunit, configured to determine that the target frequency difference is zero if the difference between the rated frequency and the real-time frequency of the power grid is within a frequency regulation dead zone; The second determining subunit is used to determine the target frequency difference as the difference between the rated frequency and the real-time frequency of the power grid if the difference between the rated frequency and the real-time frequency of the power grid is not within the frequency regulation dead zone. Optionally, the determining module includes: A third determining unit, configured to determine a frequency modulation interval corresponding to a difference between a rated frequency and a real-time frequency of the power grid according to the difference between the rated frequency and the real-time frequency of the power grid; The fourth determining unit is used to determine a second active frequency modulation coefficient corresponding to the frequency modulation interval according to the frequency modulation interval corresponding to the difference and the received active power instruction sent by the energy management system. Optionally, the fourth determining unit includes: A third determination subunit is used to determine the second active frequency modulation coefficient according to the difference between the rated frequency and the real-time frequency of the power grid, the active power value in the active power instruction, the rated power of the energy storage converter and the preset active frequency modulation coefficient if the difference between the rated frequency and the real-time frequency of the power grid is within the first frequency modulation interval; The fourth determination subunit is used to determine the second active frequency modulation coefficient according to the active power value in the active power instruction, the rated power of the energy storage inverter and the preset active frequency modulation coefficient if the difference between the rated frequency and the real-time frequency of the power grid is within the second frequency modulation interval or the third frequency modulation interval, wherein the second frequency modulation interval is an interval composed of values ​​less than the lower limit of the first frequency modulation interval, and the third frequency modulation interval is an interval composed of values ​​greater than the upper limit of the first frequency modulation interval. Optionally, the third determining subunit is calculated using the following formula: Φ=arctan(K f_set / P n ); K f =K f_set -P ref tanθ; Among them, K f is the second active frequency modulation coefficient, K f_set is the preset active frequency modulation coefficient, Pn is the rated power of the energy storage converter, Δf is the difference between the rated frequency and the real-time frequency of the power grid, P ref is the active power value in the active power instruction. Optionally, the fourth determining subunit includes: The first calculation subunit is used to use the formula if the difference between the rated frequency and the real-time frequency of the power grid is within the third frequency regulation interval determining the second active frequency modulation coefficient; The second calculation subunit is used to use the formula if the difference between the rated frequency and the real-time frequency of the power grid is within the second frequency regulation interval. determining the second active frequency modulation coefficient; Among them, K f is the second active frequency modulation coefficient, K f_set is the preset active frequency modulation coefficient, P n is the rated power of the energy storage converter, P ref is the active power value in the active power instruction. Optionally, the first frequency modulation interval includes the frequency modulation dead zone. Optionally, the compensation module includes: A compensation value determination unit is used to multiply the product of the first active frequency modulation coefficient and the second active frequency modulation coefficient by the rated power of the energy storage converter to obtain an active power compensation value of the energy storage converter. Optionally, the device further comprises: A processing module, used for taking the sum of the active power value in the active power instruction and the active power compensation value as the target active power of the energy storage converter; The regulating module is used to control the active power of the energy storage converter according to the target active power value to achieve grid frequency regulation. In a third aspect, the present application provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method described in the first aspect when executing the computer program. In a fourth aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method described in the first aspect are implemented. In the embodiment of the present application, the active frequency modulation coefficient can be automatically adjusted according to the current active power instruction of the energy storage inverter and the changing direction of the grid frequency, which can not only avoid triggering the power instruction limit, but also make full use of the capacity of the energy storage inverter and give full play to the supporting role of the energy storage inverter to the grid. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 A flowchart of an active frequency modulation control method provided in Embodiment 1 of the present application; Figure 2 A schematic diagram of a change in a second active frequency modulation coefficient when the difference between the rated frequency and the real-time frequency of the power grid provided in the first embodiment of the present application is within a third frequency modulation interval; Figure 3 A schematic diagram of a change in a second active frequency modulation coefficient when the difference between the rated frequency and the real-time frequency of the power grid provided in the first embodiment of the present application is within the second frequency modulation interval; Figure 4 A schematic diagram of a change in a second active frequency modulation coefficient when the difference between the rated frequency and the real-time frequency of the power grid provided in the first embodiment of the present application is within the positive half of the first frequency modulation interval; Figure 5 A schematic diagram of the principle of the active frequency modulation control method provided in Example 1 of the present application; Figure 6 A schematic structural diagram of an active frequency modulation control device for an energy storage converter provided in Embodiment 2 of the present application; Figure 7 A schematic diagram of the structure of an electronic device provided in Example 3 of the present application. DETAILED DESCRIPTION The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application. The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship. In conjunction with the accompanying drawings, the active frequency modulation control method, device, electronic device and readable storage medium of the energy storage converter provided in the embodiments of the present application are described in detail through specific embodiments and their application scenarios. Please refer to Figure 1 , Figure 1 This is a flow chart of an active frequency modulation control method provided in Example 1 of the present application. Figure 1As shown, an active frequency modulation control method of an energy storage converter in an embodiment of the present application includes the following steps: Step 101: Acquire the real-time frequency of the power grid to which the energy storage converter is connected; In this embodiment, the energy storage converter is connected to the power grid, and the energy storage converter is used to convert the electric energy of the power grid into direct current and charge the energy storage battery, etc., and then store the electric energy, or convert the direct current output by the energy storage battery or photovoltaic module into alternating current and transmit it to the power grid for power generation. Since the power grid is connected to many electrical devices, the frequency of the power grid is usually fluctuating. In this embodiment, the phase-locked loop set in the energy storage current meter can be used to detect the real-time frequency of the power grid. Step 102: Determine a first active frequency modulation coefficient based on the difference between the rated frequency and the real-time frequency of the power grid, and determine a second active frequency modulation coefficient based on the difference between the rated frequency and the real-time frequency of the power grid and the active power instruction received from the energy management system. In this embodiment, after obtaining the real-time frequency of the power grid, the difference between the rated frequency of the power grid and the real-time frequency of the power grid can be calculated, and then the first active frequency modulation coefficient can be determined according to the difference; and the second active frequency modulation coefficient can also be determined according to the difference and the active power instruction sent by the received energy management system. The energy management system is electrically connected to the energy storage converter, and the energy management system sends the active power instruction to control the active power of the energy storage converter. Step 103: Determine the active power compensation value of the energy storage converter according to the first active frequency modulation coefficient and the second active frequency modulation coefficient. After determining the first active frequency modulation coefficient and the second active frequency modulation coefficient, the active power compensation value of the energy storage converter can be further determined based on the two, and then the active power output by the energy storage converter can be adjusted to finally achieve the regulation of the grid frequency. In an embodiment of the present application, the active frequency modulation coefficient can be automatically adjusted according to the current active power instruction of the energy storage inverter and the changing direction of the grid frequency, that is, the first active frequency modulation coefficient and the second active frequency modulation coefficient are determined according to the difference between the rated frequency and the real-time frequency of the grid, which can avoid triggering the power instruction limit and make full use of the capacity of the energy storage inverter, thereby giving full play to the supporting role of the energy storage inverter to the grid. In some embodiments of the present application, the step of determining the first active frequency modulation coefficient according to the difference between the rated frequency and the real-time frequency of the power grid includes: Determining a target frequency difference according to a difference between a rated frequency and a real-time frequency of the power grid; A first active frequency modulation coefficient is determined according to the target frequency difference and the rated frequency of the power grid. In this embodiment, the target frequency difference is first determined according to the difference between the rated frequency and the real-time frequency of the power grid, and then the first active frequency modulation coefficient is calculated using the target frequency difference and the rated frequency of the power grid. Optionally, the step of determining the target frequency difference according to the difference between the rated frequency and the real-time frequency of the power grid includes: If the difference between the rated frequency and the real-time frequency of the power grid is within the frequency regulation dead zone, determining that the target frequency difference is zero; If the difference between the rated frequency and the real-time frequency of the power grid is not within the frequency regulation dead zone, the target frequency difference is determined to be the difference between the rated frequency and the real-time frequency of the power grid. That is, if the difference between the rated frequency of the power grid and the real-time frequency of the power grid falls within the frequency modulation dead zone, then based on the frequency modulation dead zone logic, the target frequency difference is determined to be zero; and if the difference between the rated frequency of the power grid and the real-time frequency of the power grid is not within the frequency modulation dead zone, then the target frequency difference is determined to be the difference. In some embodiments, optionally, the range of the frequency modulation dead zone is -0.03 Hz to 0.03 Hz. Therefore, the calculation method of the first active frequency modulation coefficient is: the target frequency difference is divided by the rated frequency of the power grid, that is, the first active frequency modulation coefficient is obtained. It can be known that when the difference between the rated frequency and the real-time frequency of the power grid is within the frequency modulation dead zone, the first active frequency modulation coefficient is 0, that is, at this time, the power grid frequency fluctuation range is small, and active frequency modulation is not performed. In some embodiments of the present application, optionally, the step of determining the second active frequency modulation coefficient according to the difference between the rated frequency and the real-time frequency of the power grid and the received active power instruction sent by the energy management system includes: According to the difference between the rated frequency and the real-time frequency of the power grid, determining the frequency modulation interval corresponding to the difference; According to the frequency modulation interval corresponding to the difference and the received active power instruction sent by the energy management system, a second active frequency modulation coefficient corresponding to the frequency modulation interval is determined. In this embodiment, a method of adaptively adjusting the active frequency modulation coefficient is introduced. First, a frequency modulation interval corresponding to the difference between the rated frequency and the real-time frequency of the power grid is determined, wherein a plurality of frequency modulation intervals are divided, and the second active frequency modulation coefficients corresponding to different frequency modulation intervals are determined in different ways; then, the second active frequency modulation coefficient corresponding to the frequency modulation interval is calculated according to the frequency modulation interval corresponding to the difference and the active power instruction received from the energy management system. Thus, active frequency modulation control can adapt to fluctuations in the power grid, that is, when the real-time frequency of the power grid is in different ranges, the second active frequency modulation coefficient is adaptively adjusted, and then the corresponding active power is adjusted to maximize the frequency modulation capability of the energy storage inverter and ensure the stability of the power grid frequency. In some other embodiments of the present application, optionally, the step of determining a second active frequency modulation coefficient corresponding to the frequency modulation interval according to the frequency modulation interval corresponding to the difference and the received active power instruction sent by the energy management system includes: If the difference between the rated frequency and the real-time frequency of the power grid is within the first frequency modulation interval, the second active frequency modulation coefficient is determined according to the difference between the rated frequency and the real-time frequency of the power grid, the active power value in the active power instruction, the rated power of the energy storage converter and the preset active frequency modulation coefficient; If the difference between the rated frequency and the real-time frequency of the power grid is within the second frequency modulation interval or the third frequency modulation interval, the second active frequency modulation coefficient is determined according to the active power value in the active power instruction, the rated power of the energy storage inverter and the preset active frequency modulation coefficient, wherein the second frequency modulation interval is an interval composed of values ​​less than the lower limit of the first frequency modulation interval, and the third frequency modulation interval is an interval composed of values ​​greater than the upper limit of the first frequency modulation interval. Specifically, the frequency modulation interval is divided into three intervals, namely the first frequency modulation interval, the second interval formed by the difference being less than the lower limit of the first frequency modulation interval, and the third interval formed by the difference being greater than the upper limit of the first frequency modulation interval. Exemplarily, the first frequency modulation interval is -0.05Hz-0.05Hz, the second frequency modulation interval is less than -0.05Hz, and the third frequency modulation area is greater than 0.05Hz. Of course, the size of the first frequency modulation interval can be adjusted and set according to actual conditions, but the first frequency modulation interval should include the frequency modulation dead zone, that is, the frequency modulation dead zone should fall within the first frequency modulation interval. In this embodiment, when the difference between the rated frequency and the real-time frequency of the power grid falls within different frequency modulation intervals, the method for determining the second active frequency modulation coefficient is different, which is described in detail below. (1) If the difference Δf between the rated frequency and the real-time frequency of the power grid is within the third frequency modulation interval, the second active frequency modulation coefficient is determined by the following formula: Among them, K f is the second active frequency modulation coefficient, K f_set is the preset active frequency modulation coefficient, P n is the rated power of the energy storage converter, P ref is the active power value in the active power instruction. Please refer to Figure 2 , Figure 2 This is a schematic diagram of the change of the second active frequency modulation coefficient when the difference between the rated frequency and the real-time frequency of the power grid provided in the first embodiment of the present application is within the third frequency modulation interval. Figure 2As shown in the figure, when the real-time frequency of the power grid drops (i.e., Δf ≥ 0.05 Hz), the energy storage converter should increase the output active power. If the active power value Pref in the active power instruction sent by the energy management system received by the energy storage converter is greater than zero, the energy storage converter is in a discharging state at this time, and the capacity that can be used for active frequency modulation is small, so the active frequency modulation coefficient should be reduced; if the active power value Pref in the active power instruction is less than zero, the energy storage converter is in a charging state at this time, and the capacity that can be used for active frequency modulation is large, so the active frequency modulation coefficient should be increased. (2) If the difference between the rated frequency and the real-time frequency of the power grid is within the second frequency modulation interval, the second active frequency modulation coefficient is determined by the following formula: Among them, K f is the second active frequency modulation coefficient, K f_set is the preset active frequency modulation coefficient, P n is the rated power of the energy storage converter, P ref is the active power value in the active power instruction. Please refer to Figure 3 , Figure 3 This is a schematic diagram of the change of the second active frequency modulation coefficient when the difference between the rated frequency and the real-time frequency of the power grid provided in the first embodiment of the present application is within the second frequency modulation interval. Figure 2 As shown in the figure, when the real-time frequency of the power grid increases (i.e., Δf≤﹣0.05Hz), the energy storage converter should reduce the output active power. If the active power value Pref in the active power instruction is greater than zero, the energy storage converter is in a discharging state, and the capacity that can be used for active frequency modulation is large, so the active frequency modulation coefficient should be increased; if the active power value Pref in the active power instruction is less than zero, the energy storage converter is in a charging state, and the capacity that can be used for active frequency modulation is small, so the active frequency modulation coefficient should be reduced. (3) If the difference between the rated frequency and the real-time frequency of the power grid is within the first frequency modulation interval, the following formula is used for calculation: Φ=arctan(K f_set / P n ); K f =K f_set -P ref tanθ; Among them, K f is the second active frequency modulation coefficient, K f_set is the preset active frequency modulation coefficient, P n is the rated power of the energy storage converter, Δf is the difference between the rated frequency and the real-time frequency of the power grid, P refis the active power value in the active power instruction. Please refer to Figure 4 , Figure 4 A schematic diagram of the change of the second active frequency modulation coefficient when the difference between the rated frequency and the real-time frequency of the power grid provided in the first embodiment of the present application is in the positive half of the first frequency modulation interval. In this embodiment, Figure 2 The plane where the blue dashed line is located is Figure 3 The plane where the blue dotted line is located is discontinuous at the point where Δf is equal to zero. If the two planes are directly connected at the point where Δf is equal to zero, it will lead to the second active frequency modulation coefficient K f Flutter occurs when Δf is equal to zero. To solve this problem, a curved surface needs to be inserted between the two planes so that K f It can change continuously between these two planes. Figure 4 Shows such a surface, the active frequency modulation coefficient K f It changes within the curved surface formed by the blue dotted line and the blue solid line. In the negative half of the first frequency modulation interval, the variation curve of the second active frequency modulation coefficient is similar, which will not be described here. In some embodiments of the present application, the step of determining the active power compensation value of the energy storage converter according to the first active frequency modulation coefficient and the second active frequency modulation coefficient includes: The product of the first active frequency modulation coefficient and the second active frequency modulation coefficient is multiplied by the rated power of the energy storage converter to obtain the active power compensation value of the energy storage converter. In this embodiment, after calculating the first active frequency modulation coefficient and the second active frequency modulation coefficient, the two are multiplied, and then the product of the two is multiplied by the rated power of the energy storage inverter to obtain the active power compensation value of the energy storage inverter. The active power compensation value is used to compensate for the real-time frequency fluctuations of the power grid. In some other embodiments of the present application, after the step of determining the active power compensation value of the energy storage converter according to the first active frequency modulation coefficient and the second active frequency modulation coefficient, the method further includes: Taking the sum of the active power value in the active power instruction and the active power compensation value as the target active power of the energy storage converter; Active power control is performed on the energy storage converter according to the target active power value to achieve grid frequency regulation. In this embodiment, the active power value in the active power instruction sent by the energy management system EMS and received by the energy storage inverter is added to the above-mentioned active power compensation value to obtain the final target active power of the energy storage inverter. The energy storage inverter can be controlled for active power according to the target active power value so that it outputs corresponding active power, thereby achieving frequency regulation of the power grid to which it is connected. Please refer to Figure 5 , Figure 5 This is a schematic diagram of the principle of the active frequency modulation control method provided in Example 1 of the present application. Figure 5 As shown, the rated frequency of the power grid is f n And the real-time frequency f collected g Difference is obtained by performing the difference Δf, and then two frequency modulation strategies are respectively executed, that is, the first active frequency modulation coefficient and the second active frequency modulation coefficient are respectively calculated. Among them, based on the frequency modulation dead zone logic, when it is within the frequency modulation dead zone, the output result is zero, and when it is outside the frequency modulation dead zone, the output is equal to the input, that is, equal to the difference Δf, and then the difference Δf is divided by the rated frequency f of the power grid. n , that is, the first active frequency modulation coefficient is obtained. On the other hand, based on the adaptive frequency modulation logic, according to the difference Δf and the active power value P in the active power command ref , calculate the second active frequency modulation coefficient K f The calculation formula of the second active frequency modulation coefficient is as above, which will not be repeated here. Then, the first active frequency modulation coefficient and the second active frequency modulation coefficient K f Multiply them, and then multiply the product by the rated power P of the energy storage converter n , the active power compensation value of the energy storage converter can be obtained. In summary, in the embodiment of the present application, the active frequency modulation coefficient can be automatically adjusted according to the current active power instruction of the energy storage inverter and the changing direction of the grid frequency, that is, the first active frequency modulation coefficient and the second active frequency modulation coefficient are determined according to the difference between the rated frequency and the real-time frequency of the grid, which can avoid triggering the power instruction limit and make full use of the capacity of the energy storage inverter, giving full play to the supporting role of the energy storage inverter to the grid. Please refer to Figure 6 , Figure 6 This is a schematic diagram of the structure of an active frequency modulation control device for an energy storage converter provided in the second embodiment of the present application. Figure 6 As shown, the second embodiment of the present application further provides an active frequency modulation control device for an energy storage converter, the device 600 comprising: An acquisition module 601 is used to acquire the real-time frequency of the power grid to which the energy storage converter is connected; A determination module 602 is used to determine a first active frequency modulation coefficient according to a difference between a rated frequency and a real-time frequency of the power grid, and to determine a second active frequency modulation coefficient according to the difference between the rated frequency and the real-time frequency of the power grid and an active power instruction received from an energy management system; The compensation module 603 is used to determine the active power compensation value of the energy storage converter according to the first active frequency modulation coefficient and the second active frequency modulation coefficient. Optionally, the determining module 602 includes: A first determining unit, configured to determine a target frequency difference according to a difference between a rated frequency and a real-time frequency of the power grid; The second determining unit is used to determine a first active frequency modulation coefficient according to the target frequency difference and the rated frequency of the power grid. Optionally, the first determining unit includes: A first determination subunit, configured to determine that the target frequency difference is zero if the difference between the rated frequency and the real-time frequency of the power grid is within a frequency regulation dead zone; The second determining subunit is used to determine the target frequency difference as the difference between the rated frequency and the real-time frequency of the power grid if the difference between the rated frequency and the real-time frequency of the power grid is not within the frequency regulation dead zone. Optionally, the determining module 602 includes: A third determining unit, configured to determine a frequency modulation interval corresponding to a difference between a rated frequency and a real-time frequency of the power grid according to the difference between the rated frequency and the real-time frequency of the power grid; The fourth determining unit is used to determine a second active frequency modulation coefficient corresponding to the frequency modulation interval according to the frequency modulation interval corresponding to the difference and the received active power instruction sent by the energy management system. Optionally, the fourth determining unit includes: A third determination subunit is used to determine the second active frequency modulation coefficient according to the difference between the rated frequency and the real-time frequency of the power grid, the active power value in the active power instruction, the rated power of the energy storage converter and the preset active frequency modulation coefficient if the difference between the rated frequency and the real-time frequency of the power grid is within the first frequency modulation interval; The fourth determination subunit is used to determine the second active frequency modulation coefficient according to the active power value in the active power instruction, the rated power of the energy storage inverter and the preset active frequency modulation coefficient if the difference between the rated frequency and the real-time frequency of the power grid is within the second frequency modulation interval or the third frequency modulation interval, wherein the second frequency modulation interval is an interval composed of values ​​less than the lower limit of the first frequency modulation interval, and the third frequency modulation interval is an interval composed of values ​​greater than the upper limit of the first frequency modulation interval. Optionally, the third determining subunit is calculated using the following formula: Φ=arctan(K f_set / P n ); K f =K f_set -P ref tanθ; Among them, K f is the second active frequency modulation coefficient, K f_set is the preset active frequency modulation coefficient, P nis the rated power of the energy storage converter, Δf is the difference between the rated frequency and the real-time frequency of the power grid, P ref is the active power value in the active power instruction. Optionally, the fourth determining subunit includes: The first calculation subunit is used to use the formula if the difference between the rated frequency and the real-time frequency of the power grid is within the third frequency regulation interval determining the second active frequency modulation coefficient; The second calculation subunit is used to use the formula if the difference between the rated frequency and the real-time frequency of the power grid is within the second frequency regulation interval. determining the second active frequency modulation coefficient; Among them, K f is the second active frequency modulation coefficient, K f_set is the preset active frequency modulation coefficient, P n is the rated power of the energy storage converter, P ref is the active power value in the active power instruction. Optionally, the first frequency modulation interval includes the frequency modulation dead zone. Optionally, the compensation module 603 includes: A compensation value determination unit is used to multiply the product of the first active frequency modulation coefficient and the second active frequency modulation coefficient by the rated power of the energy storage converter to obtain an active power compensation value of the energy storage converter. Optionally, the device 600 further includes: A processing module 604 is used to use the sum of the active power value in the active power instruction and the active power compensation value as the target active power of the energy storage converter; The regulating module 605 is used to control the active power of the energy storage converter according to the target active power value to achieve grid frequency regulation. In the embodiment of the present application, the active frequency modulation coefficient can be automatically adjusted according to the current active power instruction of the energy storage inverter and the changing direction of the grid frequency, that is, the first active frequency modulation coefficient and the second active frequency modulation coefficient are determined according to the difference between the rated frequency and the real-time frequency of the grid, which can avoid triggering the power instruction limit and make full use of the capacity of the energy storage inverter, giving full play to the supporting role of the energy storage inverter to the grid. The active frequency modulation control device in the embodiment of the present application can be an electronic device, or a component in the electronic device, such as an integrated circuit or a chip. The electronic device can be a terminal, or other devices other than the terminal, such as an energy storage converter. Exemplarily, the electronic device can be a mobile phone, a tablet computer, a laptop computer, a PDA, a vehicle-mounted electronic device, a mobile Internet device (Mobile Internet Device, MID), an augmented reality (augmented reality, AR) / virtual reality (virtual reality, VR) device, a robot, a wearable device, an ultra-mobile personal computer (ultra-mobile personal computer, UMPC), a netbook or a personal digital assistant (personal digital assistant, PDA), etc., and can also be a server, a network attached storage (Network Attached Storage, NAS), a personal computer (personal computer, PC), a television (television, TV), a teller machine or a self-service machine, etc., which is not specifically limited in the embodiment of the present application. The active frequency modulation control device in the embodiment of the present application may be a device having an operating system. The operating system may be an Android operating system, an iOS operating system, or other possible operating systems, which are not specifically limited in the embodiment of the present application. The image processing device provided in the embodiment of the present application can achieve Figures 1 to 5 To avoid repetition, the various processes implemented in the illustrated method embodiment will not be described again here. Alternatively, if Figure 7 As shown, an embodiment of the present application further provides an electronic device 700, including a processor 701 and a memory 702, wherein the memory 702 stores a program or instruction that can be executed on the processor 701, and when the program or instruction is executed by the processor 701, each step of the above-mentioned active frequency modulation control method embodiment is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here. It should be noted that the electronic devices in the embodiments of the present application include the mobile electronic devices and non-mobile electronic devices mentioned above. The memory 702 can be used to store software programs and various data. The memory 702 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, an application program or instructions required for at least one function (such as a sound playback function, an image playback function, etc.), etc. In addition, the memory 702 may include a volatile memory or a non-volatile memory, or the memory 702 may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate synchronous dynamic random access memory (DDRSDRAM), an enhanced synchronous dynamic random access memory (ESDRAM), a synchronous link dynamic random access memory (SLDRAM) and a direct memory bus random access memory (DRRAM). The memory 702 in the embodiment of the present application includes but is not limited to these and any other suitable types of memory. The processor 701 may include one or more processing units; optionally, the processor 701 integrates an application processor and a modem processor, wherein the application processor mainly processes operations related to an operating system, a user interface, and application programs, and the modem processor mainly processes wireless communication signals, such as a baseband processor. It is understandable that the modem processor may not be integrated into the processor 701. An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, each process of the above-mentioned image processing method embodiment is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here. The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk. It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples. Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, a disk, or an optical disk), and includes a number of instructions for a terminal (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present application. The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. An active frequency modulation control method for an energy storage converter, characterized in that: The method comprises the following steps: Obtaining the real-time frequency of the power grid to which the energy storage converter is connected; Determine a first active frequency modulation coefficient according to a difference between a rated frequency and a real-time frequency of the power grid, and determine a second active frequency modulation coefficient according to the difference between the rated frequency and the real-time frequency of the power grid and an active power instruction received from an energy management system; An active power compensation value of the energy storage converter is determined according to the first active frequency modulation coefficient and the second active frequency modulation coefficient.

2. The method according to claim 1, characterized in that The step of determining the first active frequency modulation coefficient according to the difference between the rated frequency and the real-time frequency of the power grid comprises: Determining a target frequency difference according to a difference between a rated frequency and a real-time frequency of the power grid; A first active frequency modulation coefficient is determined according to the target frequency difference and the rated frequency of the power grid.

3. The method according to claim 2, characterized in that The step of determining the target frequency difference according to the difference between the rated frequency and the real-time frequency of the power grid comprises: If the difference between the rated frequency and the real-time frequency of the power grid is within the frequency regulation dead zone, determining that the target frequency difference is zero; If the difference between the rated frequency and the real-time frequency of the power grid is not within the frequency regulation dead zone, the target frequency difference is determined to be the difference between the rated frequency and the real-time frequency of the power grid.

4. The method according to claim 1, characterized in that The step of determining the second active frequency modulation coefficient according to the difference between the rated frequency and the real-time frequency of the power grid and the received active power instruction sent by the energy management system comprises: According to the difference between the rated frequency and the real-time frequency of the power grid, the frequency modulation interval corresponding to the difference is determined; according to the frequency modulation interval corresponding to the difference and the active power instruction received from the energy management system, the second active frequency modulation coefficient corresponding to the frequency modulation interval is determined.

5. The method according to claim 4, characterized in that The step of determining a second active frequency modulation coefficient corresponding to the frequency modulation interval according to the frequency modulation interval corresponding to the difference and the received active power instruction sent by the energy management system comprises: If the difference between the rated frequency and the real-time frequency of the power grid is within the first frequency modulation interval, the second active frequency modulation coefficient is determined according to the difference between the rated frequency and the real-time frequency of the power grid, the active power value in the active power instruction, the rated power of the energy storage inverter and the preset active frequency modulation coefficient; if the difference between the rated frequency and the real-time frequency of the power grid is within the second frequency modulation interval or the third frequency modulation interval, the second active frequency modulation coefficient is determined according to the active power value in the active power instruction, the rated power of the energy storage inverter and the preset active frequency modulation coefficient, wherein the second frequency modulation interval is an interval composed of values ​​less than the lower limit of the first frequency modulation interval, and the third frequency modulation interval is an interval composed of values ​​greater than the upper limit of the first frequency modulation interval.

6. The method according to claim 5, characterized in that If the difference between the rated frequency and the real-time frequency of the power grid is within the first frequency modulation interval, the step of determining the second active frequency modulation coefficient is calculated by the following formula according to the difference between the rated frequency and the real-time frequency of the power grid, the active power value in the active power instruction, the rated power of the energy storage converter and the preset active frequency modulation coefficient: Φ=arctan(K f_set / P n ); K f =K f_set -P ref tanθ; Among them, K f is the second active frequency modulation coefficient, K f_set is the preset active frequency modulation coefficient, P n is the rated power of the energy storage converter, Δf is the difference between the rated frequency and the real-time frequency of the power grid, P ref is the active power value in the active power instruction.

7. The method according to claim 5, characterized in that If the difference between the rated frequency and the real-time frequency of the power grid is within the second frequency modulation interval or the third frequency modulation interval, the step of determining the second active frequency modulation coefficient according to the active power value in the active power instruction, the rated power of the energy storage converter and the preset active frequency modulation coefficient includes: If the difference between the rated frequency and the real-time frequency of the power grid is within the third frequency regulation interval, the formula is used: determining the second active frequency modulation coefficient; If the difference between the rated frequency and the real-time frequency of the power grid is within the second frequency regulation interval, the formula is used: determining the second active frequency modulation coefficient; Among them, K f is the second active frequency modulation coefficient, K f_set is the preset active frequency modulation coefficient, P n is the rated power of the energy storage converter, P ref is the active power value in the active power instruction.

8. The method according to claim 5, characterized in that The first frequency modulation interval includes the frequency modulation dead zone.

9. The method according to any one of claims 1 to 8, characterized in that: The step of determining the active power compensation value of the energy storage converter according to the first active frequency modulation coefficient and the second active frequency modulation coefficient comprises: The product of the first active frequency modulation coefficient and the second active frequency modulation coefficient is multiplied by the rated power of the energy storage converter to obtain the active power compensation value of the energy storage converter.

10. The method according to any one of claims 1 to 8, characterized in that: After the step of determining the active power compensation value of the energy storage converter according to the first active frequency modulation coefficient and the second active frequency modulation coefficient, the method further includes: Taking the sum of the active power value in the active power instruction and the active power compensation value as the target active power of the energy storage converter; Active power control is performed on the energy storage converter according to the target active power value to achieve grid frequency regulation.

11. An active frequency modulation control device for an energy storage converter, characterized in that: The device comprises: An acquisition module, used to acquire the real-time frequency of the power grid to which the energy storage converter is connected; A determination module, configured to determine a first active frequency modulation coefficient according to a difference between a rated frequency and a real-time frequency of the power grid, and to determine a second active frequency modulation coefficient according to the difference between the rated frequency and the real-time frequency of the power grid and an active power instruction received from an energy management system; A compensation module is used to determine the active power compensation value of the energy storage converter according to the first active frequency modulation coefficient and the second active frequency modulation coefficient.

12. An electronic device, characterized in that: The electronic device comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method according to any one of claims 1 to 10 when executing the computer program.

13. 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 10 are implemented.

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