Frequency stabilization system and frequency stabilization method for novel power system

Abstract

The invention discloses a frequency control system and method for a novel power system. The frequency control system comprises a frequency monitoring unit, a control unit and a power adjusting unit arranged on a load. The control unit generates a corresponding control instruction according to a preset rule, including: when the fluctuation amplitude of the system frequency is less than a first preset threshold, generating a control signal of the power adjustment unit according to a first analog control strategy; when the fluctuation amplitude of the system frequency is larger than the first preset threshold value and smaller than a second preset threshold value, a control signal of the power adjusting unit is generated according to a second analog control strategy; when the fluctuation amplitude of the system frequency is greater than a second preset threshold value, generating a switching control signal of a new energy power supply and / or a load for reducing the fluctuation amplitude of the system frequency; according to the method, frequency disturbance of different degrees of the power system is dealt with through multiple source, load and storage autonomous frequency regulation means, and a better frequency control effect can be obtained.

Description

Technical Field

[0001] The present invention relates to the field of power systems, and in particular to a frequency stabilization system and a frequency stabilization method for a novel power system. Background Art

[0002] The power system is a complex dynamic system. In order to continuously supply power to the load at a stable voltage and frequency, frequency stabilization control is required when the power system receives a disturbance.

[0003] In traditional power systems, synchronous generators generally have automatic droop characteristics. The load power of motor-driven machinery such as compressors, fans, and pumps is positively correlated with the speed and frequency. Therefore, system frequency regulation for short-term or small disturbances, that is, source-load power balance, can be achieved through automatic feedback, while longer-term power differences are achieved through AGC secondary frequency regulation or scheduling.

[0004] With the widespread integration of renewable energy and the construction of high-voltage direct current (HVDC) interconnected systems in new power systems, the constant power control mode of power electronic converters has led to a decrease in the power and system frequency, resulting in a decrease in frequency regulation capability. Consequently, frequency stability issues in these new power systems have become increasingly serious. In existing technologies, when these new power systems are disturbed, frequency stability control is typically achieved by switching energy storage units within the new power system.

[0005] After research, the inventors found that the existing frequency stability control methods for new power systems still have at least the following defects:

[0006] When switching on and off the energy storage units in the new power system, the control effect on the system frequency is poor, and the system frequency cannot be controlled in a timely and effective manner.

[0007] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the Invention

[0008] The purpose of the present invention is to be able to timely and effectively control the system frequency and improve the control effect.

[0009] The present invention provides a frequency control system for a new power system, the new power system comprising an active grid-forming new energy power source, a power grid, an energy storage device, and a load. The frequency control system comprises: a frequency monitoring unit, a control unit, and a power adjustment unit provided on the load; the power adjustment unit is a power electronic device;

[0010] The control unit uses the system frequency collected by the frequency monitoring unit as a parameter and generates corresponding control instructions according to preset rules, including:

[0011] When the fluctuation amplitude of the system frequency is less than a first preset threshold, a control signal of the power adjustment unit is generated according to a preset first analog control strategy; the first analog control strategy is generated according to the power and frequency response characteristics corresponding to the load;

[0012] When the fluctuation amplitude of the system frequency is greater than a first preset threshold and less than a second preset threshold, a control signal for the energy storage device is generated according to a preset second analog control strategy; the second analog control strategy is generated according to the power and frequency response characteristics corresponding to the energy storage device;

[0013] When the fluctuation amplitude of the system frequency is greater than a second preset threshold, a switching control signal of the new energy power source and / or the load is generated to reduce the fluctuation amplitude of the system frequency.

[0014] In another aspect of the embodiment of the present invention, the novel power system includes an active grid-forming new energy power source, a power grid, an energy storage device, and a load, including the steps of:

[0015] S11. Acquire the system frequency of the novel power system in real time;

[0016] S12, using the system frequency as a parameter and generating corresponding control instructions according to preset rules, including:

[0017] When the fluctuation amplitude of the system frequency is less than a first preset threshold, a control signal of the power adjustment unit is generated according to a preset first analog control strategy; the first analog control strategy is generated according to the power and frequency response characteristics corresponding to the load; the power adjustment unit as a power electronic device is used to control the power of the load;

[0018] When the fluctuation amplitude of the system frequency is greater than a first preset threshold and less than a second preset threshold, a control signal for the energy storage device is generated according to a preset second analog control strategy; the second analog control strategy is generated according to the power and frequency response characteristics corresponding to the energy storage device;

[0019] When the fluctuation amplitude of the system frequency is greater than a second preset threshold, a switching control signal of the new energy power source and / or the load is generated to reduce the fluctuation amplitude of the system frequency.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The load of the new power system in the present invention is provided with a power adjustment unit, which can realize the power electronics of the load; in the present invention, different frequency stabilization response measures are also set according to the size of the fluctuation amplitude of the system frequency; among them, when the fluctuation amplitude of the system frequency is a small-amplitude disturbance (that is, the fluctuation amplitude is less than the first preset value), the power of the load is adjusted by the power adjustment unit according to the first analog control strategy to reduce the fluctuation amplitude of the system frequency; since the first analog control strategy is set according to the response characteristics of the power and frequency of the load, it is possible to perform adaptive frequency adjustment according to the fluctuation amplitude of the system frequency; then, when the fluctuation amplitude of the system frequency is a medium-amplitude disturbance (that is, the fluctuation amplitude is greater than the first preset value and less than the second preset value), the system frequency is stabilized by charging and discharging control of the energy storage device; and when the system frequency is a large-amplitude disturbance (that is, the fluctuation amplitude is greater than the second preset value), the system frequency is stabilized by switching the power supply and load.

[0022] As can be seen from the above, the present invention automatically performs real-time and stable regulation of small-amplitude disturbances through the first analog control strategy; therefore, the present invention can achieve flexible regulation of the system frequency through moderate power regulation; compared with the method of simply controlling the stable frequency by charging and discharging the energy storage device, the present invention can avoid the secondary disturbance of the system frequency caused by the charging and discharging action of the energy storage device during small-amplitude disturbances, and thus can obtain better regulation effect during small-amplitude system disturbances.

[0023] On the other hand, the traditional method of regulating system frequency through charging and discharging control of energy storage devices still has the defect of too long response time; the power electronic load in the present invention can achieve millisecond-level response to system disturbances through the power adjustment unit, and thus can also effectively reduce the negative impact of disturbances on the new power system.

[0024] On the other hand, in the present invention, the system frequency is no longer adjusted by the charging and discharging actions of the energy storage device when there is a small system disturbance, which can greatly reduce the charging and discharging frequency of the energy storage device, thereby effectively increasing the service life of the energy storage device.

[0025] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and to implement it according to the contents of the specification, and to make the above and other purposes, technical features and advantages of the present invention easier to understand, one or more preferred embodiments are listed below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments. 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 any creative work.

[0027] Figure 1 It is a structural diagram of the frequency control system for the novel power system described in the present invention;

[0028] Figure 2 It is a schematic diagram of the steps of the frequency control method for a novel power system described in the present invention. DETAILED DESCRIPTION

[0029] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0030] Unless expressly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising” will be understood to include the stated elements or components but not to exclude other elements or components.

[0031] In this document, the terms "first", "second", etc. are used to distinguish two different elements or parts, and are not used to limit specific positions or relative relationships. In other words, in some embodiments, the terms "first", "second", etc. can also be interchangeable with each other.

[0032] Example 1

[0033] In order to be able to control the system frequency in a timely and effective manner and improve the control effect, refer to Figure 1 In an embodiment of the present invention, a frequency control system for a new power system is provided. The frequency control system includes: a frequency monitoring unit 21, a control unit 22, and a power adjustment unit 23 respectively provided at each of the loads; the power adjustment unit 23 is a power electronic device;

[0034] The frequency control system in the embodiment of the present invention is applicable to a new type of power system that needs to include an actively grid-connected new energy power source 01, a power grid 02, an energy storage device 03, and a load 04. In practical applications, the new energy power source 01 in the embodiment of the present invention may specifically include a wind power device and / or a photovoltaic power generation device; the load 04 may specifically include one or more of electric heating, variable frequency motors, electrolytic rectifiers, lighting, and charging and swapping stations.

[0035] In the embodiment of the present invention, the load 04 can be power-regulated within an acceptable and reasonable power range, and the power adjustment unit 23 and the load 04 constitute a power electronic load; thus, the load 04 can be power-regulated according to the corresponding analog control strategy.

[0036] In practical applications, the frequency monitoring unit 21 can be used to monitor the system frequency of the new power system in real time. Then, the control unit 22, as a device with data processing capabilities, can use the system frequency as a parameter and generate corresponding control instructions based on preset rules to implement different frequency control methods to stabilize the system frequency. Specifically:

[0037] The preset rules in the embodiment of the present invention may specifically include:

[0038] When the fluctuation amplitude of the system frequency is less than the first preset threshold, a control signal of the power adjustment unit 23 is generated according to a preset first analog control strategy; the first analog control strategy is generated according to the power and frequency response characteristics corresponding to the load 04;

[0039] When the fluctuation amplitude of the system frequency is greater than the first preset threshold and less than the second preset threshold, a control signal of the energy storage device 03 is generated according to a preset second analog control strategy; the second analog control strategy is generated according to the power and frequency response characteristics corresponding to the energy storage device 03;

[0040] When the fluctuation amplitude of the system frequency is greater than a second preset threshold, a switching control signal of the new energy power source 01 and / or the load 04 is generated to reduce the fluctuation amplitude of the system frequency.

[0041] In this embodiment of the present invention, different control instructions are used to implement different frequency stabilization methods, that is, different components are used to adjust the system frequency. First, the power adjustment unit 23 can be used to quickly and slightly adjust the system frequency according to the corresponding analog control strategy. Then, the frequency can be stabilized during medium-amplitude system disturbances by controlling the charging and discharging operations of the corresponding energy storage devices.

[0042] When the system frequency is adjusted through the charge and discharge control of the energy storage device 04, the frequency amplitude of the single-step adjustment is large. Therefore, when it is applied to a small-amplitude system disturbance, it is very likely to cause a secondary disturbance to the system frequency, and a good adjustment effect cannot be achieved. For this reason, in the embodiment of the present invention, a corresponding limit adjustment is set for the adjustment method using the charge and discharge control of the energy storage device. Only when the fluctuation amplitude of the system frequency is greater than a first preset threshold and less than a second preset threshold, the charging and discharging action of the energy storage device is used to reduce the fluctuation amplitude of the system frequency.

[0043] When the fluctuation amplitude of the system frequency is greater than a second preset threshold, the controllers of the new energy power source and the load execute corresponding source-load switching actions; the source-load switching actions are used to reduce the fluctuation amplitude of the system frequency.

[0044] The two frequency regulation methods, load-side power regulation and energy storage device charge and discharge control, have limited regulation range for system frequency and can only be used for system disturbances within a certain limit (i.e., the fluctuation range of system frequency is less than a second preset threshold). When the fluctuation range of system frequency is greater than the second preset threshold, it is necessary to significantly regulate the system frequency through power supply switching and / or load switching, thereby avoiding failures or equipment damage in the new power system.

[0045] In an embodiment of the present invention, when setting the first preset threshold and the second preset threshold, they can be determined based on the overall capacity of the new power system; in principle, the larger the overall capacity of the new power system is, the smaller the first preset threshold and the second preset threshold can be set; conversely, the smaller the overall capacity of the new power system is, the larger the first preset threshold and the second preset threshold can be set.

[0046] Preferably, in an embodiment of the present invention, for a new power system exceeding 3GW, the first preset threshold ±Δf1 includes ±0.2Hz; the second preset threshold ±Δf2 includes ±0.5Hz; for a new power system less than 3GW, the first preset threshold ±Δf1 includes ±0.5Hz, and the second preset threshold ±Δf2 includes ±1Hz.

[0047] Preferably, in the embodiment of the present invention, the analog control strategy (including the first analog control strategy and the second analog control strategy) can be set according to the response characteristics of power and frequency. According to different load types, the first analog control strategy of the power adjustment unit in the embodiment of the present invention may specifically include:

[0048] For fan and pump loads, the first simulation control strategy is set to P∞f 3 When the load is a positive displacement compressor, the first analog control strategy is set to P∞f; when the load is a high-power rectifier or a charging and swapping station, the first analog control strategy is set to P∞f i , where i is greater than 1.

[0049] In addition, the energy storage device in the embodiment of the present invention may include centralized or distributed, and may include adjustable loads when necessary, and be connected to the power grid through a converter and a control system. According to its power-frequency characteristics, the second analog control strategy should be based on P∞fj, j greater than 2.

[0050] In summary, the load of the new power system in the present invention is provided with a power adjustment unit, which can realize the power electronics of the load; in the present invention, different disturbance levels are set according to the magnitude of the fluctuation amplitude of the system frequency, and then different frequency stabilization response measures are determined for different levels of system disturbances; among them, when the fluctuation amplitude of the system frequency is a small-amplitude disturbance (that is, the fluctuation amplitude is less than the first preset value), the control strategy is set according to the power and frequency response characteristics of the load, so that the frequency adjustment can be adapted according to the magnitude of the fluctuation amplitude; then, when the fluctuation amplitude of the system frequency is a medium-amplitude disturbance (that is, the fluctuation amplitude is greater than the first preset value and less than the second preset value), the system frequency is stabilized by charging and discharging control of the energy storage device; and when the system frequency is a large-amplitude disturbance (that is, the fluctuation amplitude is greater than the second preset value), the system frequency is stabilized by switching the power supply and load.

[0051] As can be seen from the above, the embodiment of the present invention classifies the disturbances. In this way, when the new power system is subjected to a small disturbance, the power adjustment unit is used to adjust the power of the load according to the analog control strategy, thereby indirectly adjusting the system frequency. Since the adjustment amplitude of the load power is controllable, the embodiment of the present invention can achieve flexible adjustment of the system frequency through moderate power adjustment. Compared with the charging and discharging control method of the energy storage device, the load power adjustment method in the embodiment of the present invention can avoid the secondary disturbance of the system frequency caused by the charging and discharging action of the energy storage device, thereby achieving a better adjustment effect in the case of a small system disturbance.

[0052] On the other hand, the traditional method of regulating system frequency through charging and discharging control of energy storage devices still has the defect of too long response time; the power electronic load in the embodiment of the present invention can achieve millisecond-level response to system disturbances through the power adjustment unit, thereby effectively reducing the negative impact of disturbances on the new power system.

[0053] On the other hand, in the embodiment of the present invention, the system frequency is no longer adjusted by charging and discharging the energy storage device when a small system disturbance occurs. This can significantly reduce the charging and discharging frequency of the energy storage device, thereby effectively increasing the service life of the energy storage device.

[0054] Example 2

[0055] Based on the frequency stabilization system of embodiment 1, Figure 2 As shown, in an embodiment of the present invention, a frequency stabilization method for a new power system is also provided, specifically comprising the steps of:

[0056] S11. Acquire system frequency data of the novel power system in real time;

[0057] The frequency stabilization method in the embodiment of the present invention is applicable to a novel power system including an actively grid-connected new energy power source, a power grid, an energy storage device, and a load. The frequency stabilization system for implementing the frequency stabilization method in the embodiment of the present invention includes a frequency monitoring unit, a control unit, and a power adjustment unit respectively provided for each load. The power adjustment unit is a power electronic device.

[0058] The frequency control system in the embodiment of the present invention is applicable to a new type of power system that needs to include an actively grid-connected new energy power source, a power grid, an energy storage device, and a load; in actual applications, the new energy power source in the embodiment of the present invention may specifically include a wind power device and / or a photovoltaic power generation device; the load may specifically include one or more of electric heating, variable frequency motors, electrolytic rectifiers, lighting, and charging and swapping stations.

[0059] S12, using the system frequency as a parameter and generating corresponding control instructions according to preset rules, including:

[0060] When the fluctuation amplitude of the system frequency is less than a first preset threshold, a control signal of the power adjustment unit is generated according to a preset first analog control strategy; the first analog control strategy is generated according to the power and frequency response characteristics corresponding to the load; the power adjustment unit as a power electronic device is used to control the power of the load;

[0061] When the fluctuation amplitude of the system frequency is greater than a first preset threshold and less than a second preset threshold, a control signal for the energy storage device is generated according to a preset second analog control strategy; the second analog control strategy is generated according to the power and frequency response characteristics corresponding to the energy storage device;

[0062] When the fluctuation amplitude of the system frequency is greater than a second preset threshold, a switching control signal of the new energy power source and / or the load is generated to reduce the fluctuation amplitude of the system frequency.

[0063] As a device with data processing capabilities, the control unit can use system frequency data as a parameter and generate corresponding control instructions through preset rules to implement different frequency control methods to stabilize the system frequency. Specifically, these methods may include:

[0064] First, the power adjustment unit 23 can be used to quickly and subtly adjust the system frequency according to the corresponding analog control strategy. Then, the frequency can be stabilized during medium-amplitude system disturbances by controlling the charging and discharging actions of the corresponding energy storage device.

[0065] When the system frequency is adjusted through the charge and discharge control of the energy storage device 04, the frequency amplitude of the single-step adjustment is large. Therefore, when it is applied to a small-amplitude system disturbance, it is very likely to cause a secondary disturbance to the system frequency, and a good adjustment effect cannot be achieved. For this reason, in the embodiment of the present invention, a corresponding limit adjustment is set for the adjustment method using the charge and discharge control of the energy storage device. Only when the fluctuation amplitude of the system frequency is greater than a first preset threshold and less than a second preset threshold, the charging and discharging action of the energy storage device is used to reduce the fluctuation amplitude of the system frequency.

[0066] When the fluctuation amplitude of the system frequency is greater than a second preset threshold, the controllers of the new energy power source and the load execute corresponding source-load switching actions; the source-load switching actions are used to reduce the fluctuation amplitude of the system frequency.

[0067] The two frequency regulation methods, load-side power regulation and energy storage device charge and discharge control, have limited regulation range for system frequency and can only be used for system disturbances within a certain limit (i.e., the fluctuation range of system frequency is less than a second preset threshold). When the fluctuation range of system frequency is greater than the second preset threshold, it is necessary to significantly regulate the system frequency through power supply switching and / or load switching, thereby avoiding failures or equipment damage in the new power system.

[0068] In an embodiment of the present invention, when setting the first preset threshold and the second preset threshold, they can be determined based on the overall capacity of the new power system; in principle, the larger the overall capacity of the new power system is, the smaller the first preset threshold and the second preset threshold can be set; conversely, the smaller the overall capacity of the new power system is, the larger the first preset threshold and the second preset threshold can be set.

[0069] Preferably, in an embodiment of the present invention, for a new power system exceeding 3GW, the first preset threshold ±Δf1 includes ±0.2Hz; the second preset threshold ±Δf2 includes ±0.5Hz; for a new power system less than 3GW, the first preset threshold ±Δf1 includes ±0.5Hz, and the second preset threshold ±Δf2 includes ±1Hz.

[0070] Preferably, in the embodiment of the present invention, the analog control strategy (including the first analog control strategy and the second analog control strategy) can be set according to the response characteristics of power and frequency. According to different load types, the first analog control strategy of the power adjustment unit in the embodiment of the present invention may specifically include:

[0071] For fan and pump loads, the first simulation control strategy is set to P∞f 3 When the load is a positive displacement compressor, the first analog control strategy is set to P∞f; when the load is a high-power rectifier or a charging and swapping station, the first analog control strategy is set to P∞fi , where i is greater than 1.

[0072] In addition, the energy storage device in the embodiment of the present invention may include centralized or distributed, and may include adjustable loads when necessary, and be connected to the power grid through a converter and a control system. According to its power-frequency characteristics, the second analog control strategy should be based on P∞fj, j greater than 2.

[0073] In summary, the load of the new power system in the present invention is provided with a power adjustment unit, which can realize the power electronics of the load; in the present invention, different disturbance levels are set according to the magnitude of the fluctuation amplitude of the system frequency, and then different frequency stabilization response measures are determined for different levels of system disturbances; among them, when the fluctuation amplitude of the system frequency is a small-amplitude disturbance (that is, the fluctuation amplitude is less than the first preset value), the control strategy is set according to the power and frequency response characteristics of the load, so that the frequency adjustment can be adapted according to the magnitude of the fluctuation amplitude; then, when the fluctuation amplitude of the system frequency is a medium-amplitude disturbance (that is, the fluctuation amplitude is greater than the first preset value and less than the second preset value), the system frequency is stabilized by charging and discharging control of the energy storage device; and when the system frequency is a large-amplitude disturbance (that is, the fluctuation amplitude is greater than the second preset value), the system frequency is stabilized by switching the power supply and load.

[0074] As can be seen from the above, the embodiment of the present invention classifies the disturbances. In this way, when the new power system is subjected to a small disturbance, the power adjustment unit is used to adjust the power of the load according to the analog control strategy, thereby indirectly adjusting the system frequency. Since the adjustment amplitude of the load power is controllable, the embodiment of the present invention can achieve flexible adjustment of the system frequency through moderate power adjustment. Compared with the charging and discharging control method of the energy storage device, the load power adjustment method in the embodiment of the present invention can avoid the secondary disturbance of the system frequency caused by the charging and discharging action of the energy storage device, thereby achieving a better adjustment effect in the case of a small system disturbance.

[0075] On the other hand, the traditional method of regulating system frequency through charging and discharging control of energy storage devices still has the defect of too long response time; the power electronic load in the embodiment of the present invention can achieve millisecond-level response to system disturbances through the power adjustment unit, thereby effectively reducing the negative impact of disturbances on the new power system.

[0076] On the other hand, in the embodiment of the present invention, the system frequency is no longer adjusted by charging and discharging the energy storage device when a small system disturbance occurs. This can significantly reduce the charging and discharging frequency of the energy storage device, thereby effectively increasing the service life of the energy storage device.

[0077] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A frequency control system for a new power system, the new power system comprising an active grid-forming new energy power source, a power grid, an energy storage device, and a load, characterized in that: The frequency control system includes: a frequency monitoring unit, a control unit and a power adjustment unit provided on the load; the power adjustment unit is a power electronic device; The control unit uses the system frequency collected by the frequency monitoring unit as a parameter and generates corresponding control instructions according to preset rules, including: When the fluctuation amplitude of the system frequency is less than a first preset threshold, generating a control signal of the power adjustment unit according to a preset first analog control strategy; the first analog control strategy is generated according to the power and frequency response characteristics corresponding to the load; When the fluctuation amplitude of the system frequency is greater than a first preset threshold and less than a second preset threshold, a control signal for the energy storage device is generated according to a preset second analog control strategy; the second analog control strategy is generated according to the power and frequency response characteristics corresponding to the energy storage device; When the fluctuation amplitude of the system frequency is greater than a second preset threshold, a switching control signal of the new energy power source and / or the load is generated to reduce the fluctuation amplitude of the system frequency.

2. The frequency control system for a new power system according to claim 1, characterized in that: The power adjustment unit is a power electronic device including a power device and a drive unit.

3. The frequency control system for a new power system according to claim 2, characterized in that: The new energy power source includes a wind power device and / or a photovoltaic power generation device.

4. The frequency control system for a new power system according to claim 3, characterized in that: The loads include one or more of electric heating, variable frequency motors, electrolytic rectifiers, lighting, and charging and swapping stations.

5. The frequency control system for a new power system according to claim 4, characterized in that: For a new power system exceeding 3GW, the first preset threshold ±Δf1 includes ±0.2Hz; For a new power system with a capacity of less than 3 GW, the first preset threshold ±Δf1 includes ±0.5 Hz.

6. The frequency control system for a new power system according to claim 5, characterized in that: For new power systems exceeding 3GW, the second preset threshold ±Δf2 includes ±0.5Hz; For a new power system with a capacity of less than 3 GW, the second preset threshold ±Δf2 includes ±1 Hz.

7. The frequency control system for a new power system according to claim 6, characterized in that: include: For fan and pump loads, the first simulation control strategy is set to P∞f 3 ; When the load is a positive displacement compressor, the first analog control strategy is set to P∞f; When the load is a high-power rectifier or a charging and swapping station, the first analog control strategy is set to P∞f i , where i is greater than 1.

8. A frequency control method for a new power system, wherein the new power system comprises an active grid-forming new energy power source, a power grid, an energy storage device, and a load, characterized in that: Including steps: S11. Acquire the system frequency of the novel power system in real time; S12, using the system frequency as a parameter and generating corresponding control instructions according to preset rules, including: When the fluctuation amplitude of the system frequency is less than a first preset threshold, a control signal of the power adjustment unit is generated according to a preset first analog control strategy; the first analog control strategy is generated according to the power and frequency response characteristics corresponding to the load; the power adjustment unit as a power electronic device is used to control the power of the load; When the fluctuation amplitude of the system frequency is greater than a first preset threshold and less than a second preset threshold, a control signal for the energy storage device is generated according to a preset second analog control strategy; the second analog control strategy is generated according to the power and frequency response characteristics corresponding to the energy storage device; When the fluctuation amplitude of the system frequency is greater than a second preset threshold, a switching control signal of the new energy power source and / or the load is generated to reduce the fluctuation amplitude of the system frequency.

9. The frequency control method for a new power system according to claim 8, characterized in that: The new energy power source includes a wind power device and / or a photovoltaic power generation device; The loads include one or more of electric heating, variable frequency motors, electrolytic rectifiers, lighting, and charging and swapping stations.

10. The frequency control method for a new power system according to claim 9, characterized in that: The frequency monitoring unit collects the system frequency data of the novel power system in real time.

11. The frequency control method for a new power system according to claim 10, characterized in that: For a new power system exceeding 3GW, the first preset threshold ±Δf1 includes ±0.2Hz; the second preset threshold ±Δf2 includes ±0.5Hz; For a new power system with a capacity of less than 3 GW, the first preset threshold ±Δf1 includes ±0.5 Hz; and the second preset threshold ±Δf2 includes ±1 Hz.

12. The frequency control method for a new power system according to claim 11, characterized in that: include: For fan and pump loads, the first simulation control strategy is set to P∞f 3 ; When the load is a positive displacement compressor, the first analog control strategy is set to P∞f; when the load is a high-power rectifier or a charging and swapping station, the first analog control strategy is set to P∞f i , where i is greater than 1.

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