Electric heating load control method, device and equipment of new energy power system

Abstract

The invention discloses an electric heating load control method, device and equipment of a new energy power system. The method comprises the following steps: acquiring a real-time system frequency of the new energy power system; calculating the fluctuation amplitude of the current system disturbance according to the real-time system frequency and a preset reference system frequency; when the fluctuation amplitude is smaller than a preset threshold value, calculating adaptive input power, corresponding to the real-time system frequency, of the electric heating load according to a preset simulation control strategy; the simulation control strategy is generated according to the power and frequency response characteristics of the electric heating load; controlling the input power of the electric heating load through the thyristor power regulator based on the adaptive input power; according to the method, the small-amplitude frequency disturbance is automatically and stably adjusted in real time through an analog control strategy; therefore, the frequency flexible adjustment of the new energy power system by the electric heating load can be realized.

Description

Technical Field

[0001] The present invention relates to the field of power systems, and in particular to a method, device and equipment for controlling electric and thermal loads in a new energy power system. Background Art

[0002] Frequency stability refers to the ability of a system to maintain its frequency within a certain range after being subjected to a disturbance that causes an imbalance in power between the source and the load.

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

[0004] In AC power systems dominated by renewable energy, with the large-scale integration of renewable energy generation, non-rotating power loads such as electric heating and electric thermal storage, and the construction of high-voltage DC interconnected systems, the constant power control mode of power electronic converters has led to a serious reduction in the correlation between the power of power supplies, loads, and other equipment and the system frequency, manifesting as an increasingly weak frequency regulation capability. As a result, the frequency stability problem of AC island systems for renewable energy electrolysis hydrogen production has become increasingly serious. In existing technologies, when a renewable energy power system is disturbed, the frequency stability of the renewable energy power system is generally controlled by controlling the charge and discharge of energy storage units in the renewable energy power system.

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

[0006] The new energy storage unit charging and discharging control method to deal with the system frequency disturbance has poor timeliness and effectiveness and cannot achieve good control effect.

[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 method for controlling an electric heating load of a new energy power system, wherein the electric heating load is provided with a thyristor power regulator, and the steps include:

[0010] S11. Obtaining the real-time system frequency of the new energy power system;

[0011] S12. Calculating the fluctuation amplitude of the current system disturbance according to the real-time system frequency and a preset reference system frequency;

[0012] S13. When the fluctuation amplitude is less than a preset threshold, calculating the adaptive instantaneous power corresponding to the electric heating load and the real-time system frequency according to a preset simulation control strategy; the simulation control strategy is generated according to the power and frequency response characteristics of the electric heating load;

[0013] S14. Based on the adapted instantaneous power, the instantaneous power of the electric heating load is controlled by the thyristor power regulator.

[0014] Preferably, in the embodiment of the present invention, it further includes:

[0015] S15. When the fluctuation amplitude of the previous system disturbance is greater than the preset threshold, the system frequency is adjusted by controlling the charge and discharge of the energy storage device, and / or the fluctuation amplitude of the system frequency is reduced by switching power supplies and / or electric heating loads.

[0016] In another aspect of the present invention, there is also provided an electric heating load control device for a new energy power system, wherein the electric heating load is provided with a thyristor power regulator, comprising:

[0017] Frequency monitoring unit, used to obtain the real-time system frequency of the new energy power system;

[0018] an amplitude calculation unit, configured to calculate the fluctuation amplitude of the current system disturbance based on the real-time system frequency and a preset reference system frequency;

[0019] a power calculation unit, configured to calculate, when the fluctuation amplitude is less than a preset threshold, the adapted instantaneous power corresponding to the electric heating load and the real-time system frequency according to a preset analog control strategy; the analog control strategy is generated according to the power and frequency response characteristics of the electric heating load;

[0020] A power control unit is used to control the instantaneous power of the electric heating load through the thyristor power regulator based on the adapted instantaneous power.

[0021] Preferably, in the embodiment of the present invention, it further comprises:

[0022] The source-load switching unit is used to reduce the fluctuation amplitude of the system frequency by switching the power supply and / or the electric heating load when the fluctuation amplitude of the current system disturbance is greater than the preset threshold.

[0023] On the other hand, an embodiment of the present invention provides an electric heating load control device for a new energy power system. The electric heating load control device for the new energy power system includes a computer program stored on a medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer executes the methods described in the above aspects and achieves the same technical effects.

[0024] On the other hand, a storage medium is provided on which a computer program is stored. When the computer program is executed by a processor, each step of the electric and thermal load control method of the new energy power system as described in any one of the above items is implemented.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] In the present invention, the acceptable power fluctuation range of the electrothermal load is determined based on the acceptable temperature fluctuation range of the heated medium in the electrothermal load. Next, a simulation control strategy is established based on the power and frequency response characteristics of the electrothermal load. This simulates the power-frequency characteristics of the source-load power balance of the non-electronic power load based on the power and frequency response characteristics of the electrothermal load, thereby achieving automatic feedback power regulation to stabilize the frequency. In other words, when a small system frequency disturbance occurs, the present invention adjusts the power of the electrothermal load by switching the thyristor power regulator to a static frequency characteristic that simulates a high-damping load. This improves the stability of the system frequency through real-time response to system frequency disturbances.

[0027] As can be seen from the above, the present invention automatically performs real-time and stable regulation of small-amplitude disturbances through an 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 in the prior art, 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.

[0028] On the other hand, the traditional method of directly regulating the system frequency through the charge and discharge control of the energy storage device still has the defect of too long response time; in the present invention, the thyristor power regulator can achieve millisecond-level response to system disturbances, thereby effectively reducing the negative impact of disturbances on the new energy power system.

[0029] 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. This can greatly reduce the charging and discharging frequency of the energy storage device, thereby effectively increasing the service life of the energy storage device.

[0030] 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

[0031] 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.

[0032] Figure 1 It is a schematic diagram of the steps of the electric and thermal load control method of the new energy power system described in the present invention;

[0033] Figure 2 It is a structural diagram of the electric and thermal load control device of the new energy power system described in the present invention;

[0034] Figure 3 It is a structural diagram of the electric and thermal load control equipment of the new energy power system described in the present invention. DETAILED DESCRIPTION

[0035] 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.

[0036] 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.

[0037] 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.

[0038] Example 1

[0039] In order to be able to control the system frequency in a timely and effective manner and improve the frequency stability of the power system, refer to Figure 1 In an embodiment of the present invention, a method for controlling electric and thermal loads of a new energy power system is provided, including:

[0040] S11. Obtaining the real-time system frequency of the new energy power system;

[0041] The new energy power system in the embodiment of the present invention may include a new energy power source, an AC power grid, an electric heating load, a temperature monitoring unit, a frequency monitoring unit and a control instruction unit; wherein the electric heating load is provided with a thyristor power regulator.

[0042] The electric heating load in the embodiment of the present invention may specifically include an electric heater (furnace) directly or indirectly used for heating the medium, and an electric heating component for thermal energy storage.

[0043] In an embodiment of the present invention, the thyristor power regulator is used to control the heated medium to a preset temperature under normal working conditions (non-system disturbance conditions). Specifically, the real-time temperature of the heated medium in the electric heating load can be collected by the temperature detection unit; when the power system frequency is stable, the thyristor power regulator controls the heated medium to the preferred temperature value (i.e., the preset temperature) required by the production process by adjusting the instantaneous power of the electric heating load in real time; in actual applications, the preset temperature can be set to 800°C.

[0044] The thyristor power regulator in the embodiment of the present invention can adjust the instantaneous power by the phase-shift trigger angle of the thyristor.

[0045] In practical 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 is mainly an electric and thermal load, and in addition, it may also include ancillary equipment such as a motor and a control system.

[0046] In practical applications, a frequency monitoring unit can be provided to collect the system frequency of the new energy power system in real time.

[0047] S12. Calculating the fluctuation amplitude of the current system disturbance according to the real-time system frequency and a preset reference system frequency;

[0048] In the present invention, the system frequency corresponding to the optimal heating temperature may be determined as the reference system frequency, or the rated power frequency value may be used as the reference system frequency.

[0049] After the reference system frequency is determined, the corresponding fluctuation amplitude can be calculated based on the real-time system frequency.

[0050] S13. When the fluctuation amplitude is less than a preset threshold, calculating the adaptive instantaneous power corresponding to the electric heating load and the real-time system frequency according to a preset simulation control strategy; the simulation control strategy is generated according to the power and frequency response characteristics of the electric heating load;

[0051] For power systems with electronic power loads, the existing technology generally adjusts the system frequency through the charge and discharge control of energy storage devices. Since the frequency amplitude of its single-step adjustment is large, when it is applied to small-amplitude system disturbances, it is very likely to cause secondary disturbances to the system frequency, and a good regulation effect cannot be achieved, which in turn makes the frequency stability of the power system very poor.

[0052] To this end, in an embodiment of the present invention, the power regulation function of a thyristor power regulator is utilized to simulate the source-load power balance characteristics of a non-electronic power load. Specifically, when a small system disturbance occurs, the system frequency is no longer regulated by charge and discharge control of the energy storage device. Instead, the adaptive instantaneous power corresponding to the electric and thermal load and the real-time system frequency is calculated according to a preset simulation control strategy. In this way, the system frequency is slightly adjusted by the power change of the load to stabilize the system frequency.

[0053] In an embodiment of the present invention, an analog control strategy can be generated based on the power and frequency response characteristics of the electric heating load; wherein, when determining the value of the load damping coefficient D of the power and frequency response characteristics, the value of the load damping coefficient D can be determined from the range of 1.2-1.8 based on the temperature changes that the general electric heating load can withstand. Preferably, the value of the load damping coefficient D can be set to 1.5.

[0054] The formulas used to calculate the change in active power of the electric heating load include:

[0055]

[0056] Where, is the change in active power of the electric heating load; is the per-unit value of the system frequency change.

[0057] In the embodiment of the present invention, the value of the preset threshold value should be set according to the actual working conditions of the electric heating load. Specifically, the required condition is that when the system frequency fluctuates within the range of the preset threshold value, the temperature of the heated medium will not be lower than the minimum temperature required by the production process. The preset threshold value can be determined by calculating a more reasonable value using the formula (1) for calculating the active power change of the electric heating load, or by obtaining it through a limited number of experiments. In general, the first preset threshold value can also be qualitatively set to (±0.2Hz);

[0058] Preferably, in an embodiment of the present invention, the specific steps of calculating a reasonable value of the preset threshold may include:

[0059] S21, determining the optimal heating temperature of the heated medium and an acceptable temperature variation range;

[0060] The optimal heating temperature and acceptable temperature variation range of the heated medium can be determined according to the working conditions of the electric heating load and the requirements of the production process; generally, the optimal temperature for catalytic cracking of the heated medium can be set to 800°C; the acceptable temperature variation range of the heated medium can be set to: ±20°C.

[0061] S22, determining a reference system frequency; the reference system frequency is a system frequency or a power frequency corresponding to the optimal heating temperature;

[0062] In practical applications, the system frequency when maintaining the heated medium at the optimal heating temperature (such as 800° C.) can be determined as the reference system frequency; in addition, the power frequency (50 Hz) can also be determined as the reference system frequency.

[0063] S23, determining a power variation range corresponding to the electric heating load according to the temperature variation range;

[0064] The calculation formulas for the relationship between the power of the electric heating load and the heated medium include:

[0065]

[0066] Where C is the specific heat of the heated medium (kcal / kg·°C); M is the mass of the heated medium (kg); ΔT is the temperature rise of the heated medium (°C); and t is the residence time of the flowing medium in the furnace (h).

[0067] After setting the temperature variation range, the acceptable power variation range of the electric heating load can be obtained according to the relationship between the power of the electric heating load and the heated medium;

[0068] S24. According to the power variation interval, the allowable extreme value of the fluctuation amplitude of the system disturbance is calculated by using the formula (1) and the preset threshold is determined with reference to the allowable extreme value.

[0069] According to the corresponding relationship between the power change and the system frequency change in formula (1), the allowable extreme value of the system frequency disturbance can be calculated according to the power change range. That is, the system frequency disturbance exceeding the allowable extreme value cannot be stabilized by adjusting the load power, otherwise the heating temperature of the heated medium will not be able to meet the requirements of its acceptable temperature variation range.

[0070]

[0071] In practical applications, the preset threshold value can be determined within the range of the allowable extreme value with a certain margin, taking the allowable extreme value as a reference.

[0072] In the present invention, formula (1) can also be used to calculate the corresponding adaptive instantaneous power based on the real-time system frequency, that is, to generate a simulation control strategy based on the power and frequency response characteristics of the electrothermal load, so as to simulate the electrothermal load as a non-electronic power load with power-frequency characteristics and source-load power balance.

[0073] S14. Based on the adapted instantaneous power, the instantaneous power of the electric heating load is controlled by the thyristor power regulator.

[0074] The thyristor power regulator in the embodiment of the present invention can adjust the instantaneous power of the electric heating load as the power electronic load to the adapted instantaneous power through half-controlled phase-shift power regulation, thereby simulating the automatic feedback power regulation of the non-power electronic load.

[0075] Preferably, in the embodiment of the present invention, the steps may also be included:

[0076] S15. When the fluctuation amplitude of the current system disturbance is greater than the preset threshold, the system frequency is adjusted by controlling the charge and discharge of the energy storage device, and / or the fluctuation amplitude of the system frequency is reduced by switching power supplies and / or electric heating loads.

[0077] When the system frequency is significantly disturbed (i.e., the fluctuation amplitude is greater than a preset threshold), the system frequency can be adjusted by charging and discharging the energy storage device. Furthermore, in order to avoid damage to the equipment, the system frequency can be stabilized by switching the power supply and / or electric heating load to avoid electrical failure of the equipment caused by system frequency fluctuations.

[0078] In summary, in the embodiments of the present invention, the acceptable power fluctuation range of the electric thermal load is determined based on the acceptable temperature fluctuation range of the heated medium in the electric thermal load. Next, an analog control strategy is established based on the power and frequency response characteristics of the electric thermal load. This simulates the power-frequency characteristics of the source-load power balance of the non-electronic power load based on the power and frequency response characteristics of the electric thermal load, thereby achieving automatic feedback power regulation to stabilize the frequency. In other words, when a small system frequency disturbance occurs, the embodiments of the present invention adjust the power of the electric thermal load by switching the thyristor power regulator to a static frequency characteristic that simulates a high-damping load, thereby improving the stability of the system frequency through real-time response to the system frequency disturbance.

[0079] As can be seen from the above, the embodiment of the present invention automatically performs real-time and stable regulation of small-amplitude disturbances through an analog control strategy; therefore, the embodiment of 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 in the prior art, 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 during small-amplitude disturbances, thereby achieving a better regulation effect during small-amplitude system disturbances.

[0080] On the other hand, the traditional method of directly regulating the system frequency through the charge and discharge control of the energy storage device still has the defect of too long response time; in the embodiment of the present invention, the thyristor power regulator can achieve millisecond-level response to system disturbances, thereby effectively reducing the negative impact of disturbances on the new energy power system.

[0081] 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.

[0082] Example 2

[0083] In another aspect of the embodiment of the present invention, an electric heating load control device for a new energy power system is also provided. Figure 2 The structure diagram of the electric heat load control device of the new energy power system provided by the embodiment of the present invention is shown. Figure 1 The device corresponding to the electric and thermal load control method of the new energy power system described in the corresponding embodiment, that is, the device is realized by means of a virtual device. Figure 1 In the corresponding embodiment of the electric heating load control method for a new energy power system, each virtual module constituting the electric heating load control device of the new energy power system can be executed by an electronic device, such as a network device, a terminal device, or a server. Specifically, the electric heating load is provided with a thyristor power regulator. The electric heating load control device of the new energy power system in the embodiment of the present invention includes:

[0084] Frequency monitoring unit 01, used to obtain the real-time system frequency of the new energy power system;

[0085] Amplitude calculation unit 02, used to calculate the fluctuation amplitude of the current system disturbance according to the real-time system frequency and the preset reference system frequency;

[0086] a power calculation unit 03 configured to calculate, when the fluctuation amplitude is less than a preset threshold, the adapted instantaneous power corresponding to the electric heating load and the real-time system frequency according to a preset analog control strategy; the analog control strategy is generated according to the power and frequency response characteristics of the electric heating load;

[0087] The power control unit 04 is configured to control the instantaneous power of the electric heating load through the thyristor power regulator based on the adapted instantaneous power.

[0088] Preferably, in the embodiment of the present invention, it further includes:

[0089] The source-load switching unit (not shown in the figure) is used to reduce the fluctuation amplitude of the system frequency by switching the power supply and / or electric heating load when the fluctuation amplitude of the current system disturbance is greater than the preset threshold.

[0090] Since the working principle and beneficial effects of the electric heating load control device of the new energy power system in the embodiment of the present invention have been Figure 1 The corresponding electric and thermal load control method of the new energy power system is also recorded and explained, so you can refer to each other and will not repeat it here.

[0091] Example 3

[0092] Corresponding to the method embodiments, embodiments of the present invention also provide an electric and thermal load control device for a new energy power system, such as a terminal or server. The server can be a standalone physical server, a server cluster or distributed system consisting of multiple physical servers, or a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, CDN, and big data and artificial intelligence platforms. The terminal can be, but is not limited to, a smartphone, tablet computer, laptop computer, or desktop computer.

[0093] An example diagram of a hardware structure block diagram of an electric heat load control device for a new energy power system provided by an embodiment of the present invention is shown in FIG. Figure 3 As shown, this may include:

[0094] Processor 1, communication interface 2, memory 3 and communication bus 4;

[0095] The processor 1, the communication interface 2, and the memory 3 communicate with each other via the communication bus 4;

[0096] Optionally, the communication interface 2 may be an interface of a communication module, such as an interface of a GSM module;

[0097] The processor 1 may be a central processing unit (CPU), or an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0098] The memory 3 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0099] The processor 1 is specifically configured to execute the computer program stored in the memory 3 to perform the following steps:

[0100] S11. Obtaining the real-time system frequency of the new energy power system;

[0101] S12. Calculating the fluctuation amplitude of the current system disturbance according to the real-time system frequency and a preset reference system frequency;

[0102] S13. When the fluctuation amplitude is less than a preset threshold, calculating the adaptive instantaneous power corresponding to the electric heating load and the real-time system frequency according to a preset simulation control strategy; the simulation control strategy is generated according to the power and frequency response characteristics of the electric heating load;

[0103] S14. Based on the adapted instantaneous power, the instantaneous power of the electric heating load is controlled by the thyristor power regulator.

[0104] Preferably, in the embodiment of the present invention, it further includes:

[0105] S15. When the fluctuation amplitude of the previous system disturbance is greater than the preset threshold, the system frequency is adjusted by controlling the charge and discharge of the energy storage device, and / or the fluctuation amplitude of the system frequency is reduced by switching power supplies and / or electric heating loads.

[0106] The above-mentioned product can execute the method provided by the embodiment of the present invention, and has the functional modules and beneficial effects corresponding to the execution method. For technical details not fully described in this embodiment, please refer to the electric and thermal load control method of the new energy power system provided by the embodiment of the present invention.

[0107] Example 4

[0108] In an embodiment of the present invention, a storage medium is further provided. The storage medium may store a program suitable for execution by a processor, wherein the program is used to:

[0109] S11. Obtaining the real-time system frequency of the new energy power system;

[0110] S12. Calculating the fluctuation amplitude of the current system disturbance according to the real-time system frequency and a preset reference system frequency;

[0111] S13. When the fluctuation amplitude is less than a preset threshold, calculating the adaptive instantaneous power corresponding to the electric heating load and the real-time system frequency according to a preset simulation control strategy; the simulation control strategy is generated according to the power and frequency response characteristics of the electric heating load;

[0112] S14. Based on the adapted instantaneous power, the instantaneous power of the electric heating load is controlled by the thyristor power regulator.

[0113] Preferably, in the embodiment of the present invention, it further includes:

[0114] S15. When the fluctuation amplitude of the previous system disturbance is greater than the preset threshold, the system frequency is adjusted by controlling the charge and discharge of the energy storage device, and / or the fluctuation amplitude of the system frequency is reduced by switching power supplies and / or electric heating loads.

[0115] Optionally, the detailed functions and extended functions of the program may refer to the above description.

[0116] The above-mentioned product can execute the method provided by the embodiment of the present invention, and has the functional modules and beneficial effects corresponding to the execution method. For technical details not fully described in this embodiment, please refer to the methods provided by other embodiments of the present invention.

[0117] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0118] In the several embodiments provided herein, it should be understood that the disclosed systems, devices, and methods may be implemented in other ways. Furthermore, the couplings or direct couplings or communication connections shown or discussed may be indirect couplings or communication connections through interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0119] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0120] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0121] It should be understood that in the embodiments of the present application, the various embodiments and features can be combined with each other to solve the aforementioned technical problems.

[0122] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0123] 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 method for controlling an electric heating load of a new energy power system, wherein the electric heating load is provided with a thyristor power regulator, characterized in that: include: S11. Obtaining the real-time system frequency of the new energy power system; S12. Calculating the fluctuation amplitude of the current system disturbance according to the real-time system frequency and a preset reference system frequency; S13. When the fluctuation amplitude is less than a preset threshold, calculating the adaptive instantaneous power corresponding to the electric heating load and the real-time system frequency according to a preset simulation control strategy; the simulation control strategy is generated according to the power and frequency response characteristics of the electric heating load; S14. Based on the adapted instantaneous power, the instantaneous power of the electric heating load is controlled by the thyristor power regulator.

2. The electric and thermal load control method of the new energy power system according to claim 1 is characterized in that: Also includes: S15. When the fluctuation amplitude of the current system disturbance is greater than the preset threshold, the system frequency is adjusted by controlling the charge and discharge of the energy storage device, and / or the fluctuation amplitude of the system frequency is reduced by switching power supplies and / or electric heating loads.

3. The electric and thermal load control method of the new energy power system according to claim 1, characterized in that: The calculating, according to a preset simulation control strategy, the adapted instantaneous power corresponding to the electric heating load and the real-time system frequency includes: Setting the value of the load damping coefficient D of the power and frequency response characteristics; the value range of the load damping coefficient D includes 1.2-1.8; The formulas used to calculate the change in active power of the electric heating load include: Where, is the active power change of the electric heating load; Δf * is the per-unit value of the system frequency change.

4. The electric and thermal load control method of the new energy power system according to claim 3 is characterized in that: Determining the preset threshold includes: S21, determining the optimal heating temperature of the heated medium and an acceptable temperature variation range; S22, determining a reference system frequency; the reference system frequency is a system frequency corresponding to the optimal heating temperature, or a power frequency; S23, determining a power variation range corresponding to the electric heating load according to the temperature variation range; S24. According to the power variation interval, the allowable extreme value of the fluctuation amplitude of the power system frequency disturbance is calculated by using the formula (1) and the preset threshold is determined with reference to the allowable extreme value.

5. The electric and thermal load control method of the new energy power system according to claim 4 is characterized in that: The acceptable temperature variation range of the heated medium includes: taking the optimal heating temperature as a reference value, and fluctuating by 20°C.

6. The electric and thermal load control method of the new energy power system according to claim 4, characterized in that: The determining the power variation interval corresponding to the electric heating load according to the temperature variation interval includes: The calculation formulas for the relationship between the power of the electric heating load and the heated medium include: Where C is the specific heat of the heated medium (kcal / kg·°C); M is the mass of the heated medium (kg); ΔT is the temperature rise of the heated medium (°C); and t is the residence time of the flowing medium in the furnace (h).

7. The electric and thermal load control method of the new energy power system according to claim 1 or 2, characterized in that: The new energy power source includes a wind power device and / or a photovoltaic power generation device.

8. The electric and thermal load control method of the new energy power system according to claim 3, characterized in that: The load damping coefficient is greater than or equal to 1.

5.

9. An electric heating load control device for a new energy power system, equipped with a thyristor power regulator, characterized in that: include: Frequency monitoring unit, used to obtain the real-time system frequency of the new energy power system; an amplitude calculation unit, configured to calculate the fluctuation amplitude of the current system disturbance based on the real-time system frequency and a preset reference system frequency; a power calculation unit, configured to calculate, when the fluctuation amplitude is less than a preset threshold, the adapted instantaneous power corresponding to the electric and thermal load and the real-time system frequency according to a preset analog control strategy; The analog control strategy is generated based on the power and frequency response characteristics of the electric heating load; A power control unit is used to control the instantaneous power of the electric heating load through the thyristor power regulator based on the adapted instantaneous power.

10. The electric heating load control device of the new energy power system according to claim 9, characterized in that: Also includes: The source-load switching unit is used to adjust the system frequency by controlling the charge and discharge of the energy storage device when the fluctuation amplitude of the current system disturbance is greater than the preset threshold, and / or to reduce the fluctuation amplitude of the system frequency by switching the power supply and / or the electric heating load.

11. An electric heating load control device for a new energy power system, characterized in that: include: memory for storing computer programs; A processor is used to call and execute the computer program to implement the steps of the electric and thermal load control method of the new energy power system as described in any one of claims 1 to 8.

12. A storage medium, characterized in that: It comprises a software program, which is suitable for a processor to execute the steps of the electric and thermal load control method of the new energy power system as claimed in any one of claims 1 to 8.

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