Primary frequency modulation control method, device, equipment and medium for network construction type optical storage power station

Abstract

The invention discloses a primary frequency modulation control method, device, equipment and medium for a network construction type optical storage power station. The method comprises the following steps: acquiring the actual frequency of a power grid system; comparing the actual frequency with a preset dead zone, and judging whether the actual frequency exceeds the dead zone; if the actual frequency exceeds the dead zone, according to the SOC value of the energy storage system, the actual active power of the photovoltaic system and the active power output by the photovoltaic system, whether the energy storage system and the photovoltaic system participate in primary frequency modulation of the optical storage power station or not is judged; and if the energy storage system and / or the photovoltaic system participate in the primary frequency modulation, selecting a primary frequency modulation algorithm to determine the active power variation of the power station and the primary frequency modulation regulation quantity of the photovoltaic system. When the actual frequency of the power grid system deviates from the target value, the frequency of the power grid system is improved by judging whether the energy storage system and the photovoltaic system participate in the primary frequency modulation of the optical storage power station or not and calculating and distributing the active power of the primary frequency modulation through a related algorithm.

Description

Technical Field

[0001] The present invention relates to the technical field of coordinated control of centralized energy storage configuration in photovoltaic power stations, and in particular to a primary frequency modulation control method, device, equipment and medium for a grid-type photovoltaic power station. Background Art

[0002] As the use of a high proportion of renewable energy becomes a trend, the intermittent, random and instability of new energy sources has brought challenges to the power system. Grid-based energy storage technology solves the problem of rapid fluctuations in the output of renewable energy through large-scale charging and discharging, and provides corresponding inertia support for the power system, thereby improving the controllability and flexibility of the system. In the new power system, grid-based energy storage technology is a key technical means to support the access and absorption of a high proportion of renewable energy, and has unique advantages in improving the flexibility of the power system and ensuring the safety and stability of the power grid.

[0003] Although the related supporting equipment of the grid-type photovoltaic and energy storage power station has also been researched and developed, the primary frequency regulation equipment of most grid-type photovoltaic and energy storage power stations can only control the grid-type photovoltaic system or the grid-type energy storage system alone. Due to the uncertainty of grid-type photovoltaic and the differences in the grid system, a primary frequency regulation control method suitable for grid-type photovoltaic and energy storage power stations is urgently needed.

[0004] At present, the control method of the primary frequency modulation device of the grid-type photovoltaic power station mainly focuses on the separate control of the grid-type energy storage system and the grid-type photovoltaic system. Whether the primary frequency modulation device can correctly control a single system has not been realized, and the overall control of the grid-type energy storage and grid-type photovoltaic by the primary frequency modulation device has not been realized. How to realize the communication between the host computer and the primary frequency modulation device and how to reasonably distribute the active power according to the grid frequency, so as to give full play to the active coordination support ability of the energy storage system and the photovoltaic system to the grid, thereby greatly improving the power generation capacity of the photovoltaic power station.

[0005] This section is intended to provide a background or context to the embodiments of the invention recited in the claims. No admission is made that the description herein is prior art by inclusion in this section. Summary of the invention

[0006] The embodiment of the present invention provides a primary frequency modulation control method for a grid-connected photovoltaic power station, which is used to increase the frequency of the power grid system to ensure safe and stable operation of the power system. The method includes:

[0007] Acquire the actual frequency of the power grid system connected to the photovoltaic power station; wherein the photovoltaic power station includes an energy storage system and a photovoltaic system;

[0008] Compare the actual frequency with a preset dead zone interval to determine whether the actual frequency exceeds the dead zone interval;

[0009] If the actual frequency exceeds the dead zone, determine whether the energy storage system and the photovoltaic system participate in the primary frequency regulation of the photovoltaic power station according to the SOC value of the energy storage system, the actual active power of the photovoltaic system and the active power output of the photovoltaic system;

[0010] If the energy storage system and / or the photovoltaic system participate in primary frequency regulation, a primary frequency regulation algorithm is selected to determine the change in active power of the power station and the primary frequency regulation adjustment amount of the photovoltaic system, and primary frequency regulation control is performed according to the change in active power of the power station and the primary frequency regulation adjustment amount of the photovoltaic system.

[0011] Further, when the actual frequency is greater than the upper limit of the dead zone, judging whether the energy storage system and the photovoltaic system participate in the primary frequency regulation of the photovoltaic power station according to the SOC value of the energy storage system, the actual active power of the photovoltaic system and the active power output of the photovoltaic system includes:

[0012] It is determined whether the SOC value is between a preset SOC minimum value and a preset SOC maximum value and whether the actual active power is not equal to zero. If both are yes, the energy storage system and the photovoltaic system both participate in a frequency modulation.

[0013] Further, when the actual frequency is greater than the upper limit of the dead zone, judging whether the energy storage system and the photovoltaic system participate in the primary frequency regulation of the photovoltaic power station according to the SOC value of the energy storage system and the actual active power of the photovoltaic system includes:

[0014] It is determined whether the SOC value is between a preset SOC minimum value and a preset SOC maximum value and whether the actual active power is equal to zero. If both are yes, the energy storage system participates in primary frequency modulation, and the photovoltaic system does not participate in primary frequency modulation.

[0015] Further, when the actual frequency is greater than the upper limit of the dead zone, judging whether the energy storage system and the photovoltaic system participate in the primary frequency regulation of the photovoltaic power station according to the SOC value of the energy storage system and the actual active power of the photovoltaic system includes:

[0016] It is determined whether the SOC value is between a preset SOC maximum value and 1 and is greater than or equal to a preset threshold value. If both are yes, the energy storage system does not participate in primary frequency modulation, and the photovoltaic system participates in primary frequency modulation.

[0017] Further, when the actual frequency is greater than the upper limit of the dead zone, judging whether the energy storage system and the photovoltaic system participate in the primary frequency regulation of the photovoltaic power station according to the SOC value of the energy storage system and the actual active power of the photovoltaic system includes:

[0018] It is determined whether the SOC value is between a preset SOC maximum value and 1 and the actual active power is equal to zero. If both are yes, the energy storage system and the photovoltaic system do not participate in primary frequency modulation.

[0019] Further, when the actual frequency is less than the lower limit of the dead zone, judging whether the energy storage system and the photovoltaic system participate in the primary frequency regulation of the photovoltaic power station according to the SOC value of the energy storage system and the actual active power of the photovoltaic system includes:

[0020] It is determined whether the SOC value is between a preset SOC minimum value and a preset SOC maximum value and whether the actual active power is not equal to zero. If both are yes, the energy storage system and the photovoltaic system both participate in a frequency modulation.

[0021] Further, when the actual frequency is less than the lower limit of the dead zone, judging whether the energy storage system and the photovoltaic system participate in the primary frequency regulation of the photovoltaic power station according to the SOC value of the energy storage system and the actual active power of the photovoltaic system includes:

[0022] It is determined whether the SOC value is between a preset SOC minimum value and a preset SOC maximum value and whether the actual active power is equal to zero. If both are yes, the energy storage system participates in primary frequency modulation, and the photovoltaic system does not participate in primary frequency modulation.

[0023] Further, when the actual frequency is less than the lower limit of the dead zone, judging whether the energy storage system and the photovoltaic system participate in the primary frequency regulation of the photovoltaic power station according to the SOC value of the energy storage system and the actual active power of the photovoltaic system includes:

[0024] It is determined whether the SOC value is between zero and a preset SOC minimum value and is greater than or equal to a preset threshold value. If both are yes, the energy storage system does not participate in primary frequency modulation, and the photovoltaic system participates in primary frequency modulation.

[0025] Further, when the actual frequency is less than the lower limit of the dead zone, judging whether the energy storage system and the photovoltaic system participate in the primary frequency regulation of the photovoltaic power station according to the SOC value of the energy storage system and the actual active power of the photovoltaic system includes:

[0026] It is determined whether the SOC value is between zero and a preset SOC minimum value and the actual active power is equal to zero. If both are yes, the energy storage system and the photovoltaic system do not participate in primary frequency regulation.

[0027] The embodiment of the present invention further provides a primary frequency modulation control device for a grid-type photovoltaic power station, which is used to increase the frequency of the power grid system to ensure the safe and stable operation of the power system. The device includes:

[0028] Frequency acquisition module, used to obtain the actual frequency of the power grid system;

[0029] A frequency determination module, used to compare the actual frequency with a preset dead zone threshold to determine whether the actual frequency exceeds a preset dead zone interval;

[0030] A primary frequency modulation judgment module is used to judge whether the energy storage system and the photovoltaic system participate in the primary frequency modulation of the photovoltaic power station according to the SOC value of the energy storage system, the actual active power of the photovoltaic system, and if the actual frequency exceeds the dead zone interval;

[0031] The primary frequency regulation amount determination module is used to select a primary frequency regulation algorithm to determine the active power change of the power station and the primary frequency regulation amount of the photovoltaic system if the energy storage system and / or the photovoltaic system participate in the primary frequency regulation.

[0032] Furthermore, the primary frequency modulation determination module includes:

[0033] The first frequency modulation judgment unit is used to judge whether the SOC value is between a preset SOC minimum value and a preset SOC maximum value and whether the actual active power is not equal to zero when the actual frequency is greater than the upper limit value of the dead zone interval. If both are yes, the energy storage system and the photovoltaic system both participate in the primary frequency modulation.

[0034] Furthermore, the primary frequency modulation determination module further includes:

[0035] The second frequency modulation judgment unit is used to judge whether the SOC value is between the preset SOC minimum value and the preset SOC maximum value and whether the actual active power is equal to zero when the actual frequency is greater than the upper limit value of the dead zone interval. If both are yes, the energy storage system participates in the primary frequency modulation, and the photovoltaic system does not participate in the primary frequency modulation.

[0036] Furthermore, the primary frequency modulation determination module further includes:

[0037] The third frequency modulation judgment unit is used to judge whether the SOC value is between the preset SOC maximum value and 1 and whether the active power output of the photovoltaic system is greater than or equal to the preset threshold when the actual frequency is greater than the upper limit value of the dead zone. If both are yes, the energy storage system does not participate in the primary frequency modulation, and the photovoltaic system participates in the primary frequency modulation.

[0038] Furthermore, the primary frequency modulation determination module further includes:

[0039] The fourth frequency modulation judgment unit is used to judge whether the SOC value is between the preset SOC maximum value and 1 and whether the actual active power is equal to zero when the actual frequency is greater than the upper limit value of the dead zone interval. If both are yes, the energy storage system and the photovoltaic system do not participate in the primary frequency modulation.

[0040] Furthermore, the primary frequency modulation determination module further includes:

[0041] The fifth frequency modulation judgment unit is used to judge whether the SOC value is between the preset SOC minimum value and the preset SOC maximum value and whether the actual active power is not equal to zero when the actual frequency is less than the lower limit of the dead zone interval. If both are yes, the energy storage system and the photovoltaic system both participate in the frequency modulation.

[0042] Furthermore, the primary frequency modulation determination module further includes:

[0043] The sixth frequency modulation judgment unit is used to judge whether the SOC value is between the preset SOC minimum value and the preset SOC maximum value and whether the actual active power is equal to zero when the actual frequency is less than the lower limit of the dead zone interval. If both are yes, the energy storage system participates in the primary frequency modulation, and the photovoltaic system does not participate in the primary frequency modulation.

[0044] Furthermore, the primary frequency modulation determination module further includes:

[0045] The seventh frequency modulation judgment unit is used to judge whether the SOC value is between zero and the preset SOC minimum value and whether the active power output of the photovoltaic system is greater than or equal to a preset threshold value when the actual frequency is less than the lower limit of the dead zone. If both are yes, the energy storage system does not participate in the primary frequency modulation, and the photovoltaic system participates in the primary frequency modulation.

[0046] Furthermore, the primary frequency modulation determination module further includes:

[0047] The eighth frequency modulation judgment unit is used to judge whether the SOC value is between zero and the preset SOC minimum value and whether the actual active power is equal to zero when the actual frequency is less than the lower limit of the dead zone interval. If both are yes, the energy storage system and the photovoltaic system do not participate in the primary frequency modulation.

[0048] An embodiment of the present invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the primary frequency modulation control method of the above-mentioned grid-type photovoltaic power station when executing the computer program.

[0049] An embodiment of the present invention further 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 primary frequency modulation control method of the above-mentioned grid-type photovoltaic power station is implemented.

[0050] An embodiment of the present invention further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the primary frequency modulation control method of the grid-type photovoltaic power station is implemented.

[0051] The embodiments of the present invention provide a primary frequency regulation control method, device, equipment and medium for a grid-type photovoltaic power station with energy storage. By real-time monitoring the output changes of a grid-type photovoltaic system and a grid-type energy storage system during primary frequency regulation and the active power changes of a grid-type photovoltaic power station with energy storage, when there is a deviation between the actual frequency of the power grid system and the target value, based on the above data, combined with the SOC value of the grid-type energy storage system and the actual active power of the grid-type photovoltaic system, it is determined whether the energy storage system and the photovoltaic system participate in the primary frequency regulation of the photovoltaic power station, and the active power of the primary frequency regulation is calculated and allocated through a relevant algorithm, thereby increasing the frequency of the power grid system to ensure safe and stable operation of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. 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 creative work. In the drawings:

[0053] Figure 1 It is a flow chart of a primary frequency modulation control method of a grid-type photovoltaic power station in one embodiment of the present invention;

[0054] Figure 2 It is a flow chart of a primary frequency modulation control method of a grid-type photovoltaic power station in another embodiment of the present invention;

[0055] Figure 3 This is a schematic diagram of a logic judgment flow of a primary frequency modulation system in one embodiment of the present invention;

[0056] Figure 4 It is a flow chart of a primary frequency modulation control method of a grid-type photovoltaic power station in another embodiment of the present invention;

[0057] Figure 5 This is a signal collection connection diagram of a grid-type photovoltaic power station in one embodiment of the present invention;

[0058] Figure 6 It is a structural schematic diagram of a primary frequency modulation control device of a grid-type photovoltaic power station in one embodiment of the present invention;

[0059] Figure 7 A schematic diagram of the physical structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0060] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0061] The information collected in the technical solution of this application is information and data authorized by the user or fully authorized by all parties, and the collection, storage, use, processing, transmission, provision, disclosure and application of relevant data comply with the relevant laws, regulations and standards of relevant countries and regions, take necessary confidentiality measures, do not violate public order and good morals, and provide corresponding operation entrances for users to choose to authorize or refuse.

[0062] The acquisition, transmission, storage, use, and processing of data in the technical solution of this application comply with the relevant provisions of national laws and regulations.

[0063] It should be noted that in the embodiments of the present application, certain software, components, models and other existing solutions in the industry may be mentioned, and they should be regarded as exemplary. Their purpose is only to illustrate the feasibility of implementing the technical solution of the present application, but it does not mean that the applicant has or will necessarily use the solution.

[0064] To facilitate the description of the embodiments of the present invention, the grid-type energy storage system, the grid-type photovoltaic system and the grid-type photovoltaic storage power station described in the embodiments of the present invention are simplified to an energy storage system, a photovoltaic system and a photovoltaic storage power station.

[0065] Since the grid-type photovoltaic power station generally controls the energy storage system 501 and / or the photovoltaic system 502 manually, the operation steps are relatively cumbersome. At the same time, it is impossible to adjust the frequency of the power grid system in the first time, thereby failing to ensure the safe and stable operation of the power grid. In order to automatically realize the primary frequency modulation function more quickly and accurately, the present invention provides a primary frequency modulation control method for a grid-type photovoltaic power station, which realizes the active power distribution of the grid-type photovoltaic power station under various working conditions through a primary frequency modulation control system, so as to accurately distribute the active power to the energy storage system 501 and the photovoltaic system 502, which helps to improve the frequency of the power grid system and ensure the safe and stable operation of the power system.

[0066] Figure 1 FIG. 1 is a flow chart of a primary frequency modulation control method for a grid-type photovoltaic power station in an embodiment of the present invention; Figure 1 As shown, the execution subject is a primary frequency modulation system and the method includes steps 101 to 104.

[0067] Step 101: Acquire the actual frequency of the power grid system connected to the photovoltaic power station; wherein the photovoltaic power station includes an energy storage system 501 and a photovoltaic system 502;

[0068] Step 102: Compare the actual frequency with the preset dead zone interval to determine whether the actual frequency exceeds the dead zone interval.

[0069] Step 103: If the actual frequency exceeds the dead zone, determine whether the energy storage system 501 and the photovoltaic system 502 participate in the primary frequency regulation of the grid-connected photovoltaic power station according to the SOC value of the energy storage system 501, the actual active power of the photovoltaic system 502 and the active power output of the photovoltaic system 502.

[0070] Step 104: If the energy storage system 501 and / or the photovoltaic system 502 participate in the primary frequency regulation, a primary frequency regulation algorithm is selected to determine the change in active power of the power station and the primary frequency regulation adjustment amount of the photovoltaic system 502, and primary frequency regulation control is performed according to the change in active power of the power station and the primary frequency regulation adjustment amount of the photovoltaic system 502.

[0071] from Figure 1 It can be seen from the process shown that in the embodiment of the present invention, by developing a set of control software for data communication between the primary frequency modulation system and the host computer, the frequency modulation control of the power grid system can be realized. At the same time, the output changes of the photovoltaic system 502 and the energy storage system 501 during the primary frequency modulation and the active power changes of the grid-connected point of the grid-type photovoltaic storage power station are monitored in real time. According to the above data, when there is a deviation between the actual frequency of the power grid system and the target value, combined with the SOC value of the energy storage system 501 and the actual active power of the photovoltaic system 502, it is determined whether the energy storage system 501 and the photovoltaic system 502 participate in the primary frequency modulation of the grid-type photovoltaic storage power station, and the active power of the primary frequency modulation is calculated and allocated through relevant algorithms, thereby increasing the frequency of the power grid system to ensure the safe and stable operation of the power system.

[0072] like Figures 1 to 3 As shown, each step is explained in detail below.

[0073] Step 101: Acquire the actual frequency of the power grid system connected to the photovoltaic power station; wherein the photovoltaic power station includes an energy storage system 501 and a photovoltaic system 502.

[0074] Specifically, the actual frequency, three-phase voltage and three-phase current of the power grid system are collected. After the actual frequency of the power grid system is collected, real-time communication is performed with the primary frequency regulator through the communication port. The SOC value of the energy storage system 501 is calculated based on the collected three-phase voltage and three currents through the energy storage system 501 (EMS, Energy Management System). Among them, the communication port can be an RS-232 communication port or other communication ports, and this embodiment does not make specific restrictions.

[0075] In one embodiment, the SOC value of the energy storage system 501 is divided into three stages.

[0076] The first stage is: when 0≤SOC1<SOC min When the energy storage system 501 is at +5%, discharging is prohibited and charging of the energy storage system 501 is permitted.

[0077] The second stage is: when SOC min +5%≤SOC2≤SOC max During this time, the energy storage system 501 allows both charging and discharging.

[0078] The third stage is: when SOC max When <SOC3≤1, the energy storage system 501 is prohibited from charging, and the energy storage system 501 is allowed to discharge.

[0079] Among them, SOC min The minimum SOC value of the energy storage system is generally 5% to 10%. max The maximum value of the energy storage system 501SOC value is generally 90% to 95%. Due to different battery types, the SOC should be reasonably set. min With SOC max The value range of is not specifically limited in this embodiment.

[0080] Step 102: Compare the actual frequency of the power grid system with the preset dead zone interval to determine whether the actual frequency of the power grid system exceeds the dead zone interval.

[0081] Specifically, the preset dead zone interval is determined according to the preset rated frequency of the power grid system, the value range of the preset dead zone interval of the energy storage system 501, and the value range of the preset dead zone interval of the photovoltaic system 502. Among them, the rated frequency of the power grid system is 50Hz, the value range of the dead zone interval of the energy storage system 501 can be the rated frequency of the power grid system ±0.03Hz to the rated frequency of the power grid system ±0.05Hz, and the value range of the dead zone interval of the photovoltaic system 502 can be the rated frequency of the power grid system ±0.02Hz to the rated frequency of the power grid system ±0.06Hz.

[0082] In one embodiment, the actual frequency of the power grid system is compared with a preset dead zone interval to determine whether the actual frequency of the power grid system exceeds the dead zone interval. For example, the dead zone interval takes the minimum value of the dead zone interval value range of the energy storage system 501, that is, the dead zone interval is the rated frequency of the power grid system ±0.03Hz, then when the actual frequency of the power grid system is greater than 50+0.03Hz or the actual frequency of the power grid system is less than 50-0.03Hz, the actual frequency of the power grid system exceeds the dead zone interval.

[0083] For another example, the dead zone interval can also be the middle value of the dead zone interval value range of the energy storage system 501 and the dead zone interval value range of the photovoltaic system 502, that is, the dead zone interval is the rated frequency of the power grid system ±0.04 Hz. When the actual frequency of the power grid system is greater than 50+0.04 Hz or the actual frequency of the power grid system is less than 50-0.04 Hz, the actual frequency of the power grid system exceeds the dead zone interval.

[0084] In this embodiment, the above-mentioned preset dead zone interval, the preset grid system rated frequency, the preset energy storage system 501 dead zone interval value range and the preset photovoltaic system 502 dead zone interval value range are not specifically limited by the embodiment of the present invention.

[0085] Step 103: If the actual frequency of the power grid system exceeds the dead zone, determine whether the energy storage system 501 and the photovoltaic system 502 participate in the primary frequency regulation of the photovoltaic power station according to the SOC value of the energy storage system 501, the actual active power of the photovoltaic system 502 and the active power output of the photovoltaic system 502.

[0086] Specifically, if the actual frequency of the power grid system exceeds the dead zone interval and lasts for a preset rated time, it is determined whether the energy storage system 501 and the photovoltaic system 502 participate in the primary frequency regulation of the grid-type photovoltaic power station according to the SOC value of the energy storage system 501, the actual active power of the photovoltaic system 502, and the active power output of the photovoltaic system 502. The preset rated time can be set to 30ms to 100ms, and this embodiment does not impose specific restrictions.

[0087] like Figure 2 As shown, step 103 includes steps 201 to 208 .

[0088] Step 201: When the actual frequency of the power grid system is greater than the upper limit of the dead zone, determine whether the SOC value of the energy storage system 501 is between the preset SOC minimum value and the preset SOC maximum value and whether the actual active power of the photovoltaic system 502 is not equal to zero. If both are yes, the energy storage system 501 and the photovoltaic system 502 both participate in the primary frequency regulation of the photovoltaic power station.

[0089] Specifically, when the actual frequency of the power grid system is greater than the upper limit of the dead zone (i.e., the actual frequency of the power grid system is too high), according to the SOC value of the energy storage system 501 and the actual active power P of the photovoltaic system 502 ph , to determine whether the energy storage system 501 and the photovoltaic system 502 participate in the primary frequency regulation of the grid-type photovoltaic power station. ph is the actual active power of the photovoltaic system 502 .

[0090] If the SOC value of the energy storage system 501 is between SOC min +5%≤SOC2≤SOC max The energy storage system 501 has a charging function and participates in a frequency modulation. ph ≠0, the photovoltaic system 502 participates in the primary frequency regulation. That is, mode 1 is that both the energy storage system 501 and the photovoltaic system 502 participate in the primary frequency regulation of the power station.

[0091] In this embodiment, when the actual frequency of the power grid system is too high, the power grid's electric energy is stored in the energy storage system 501 (i.e., the energy storage system 501 is charged), and the active power of the photovoltaic system 502 is adjusted to reduce the output of the photovoltaic system 502, so as to reduce the actual frequency of the power grid system, thereby ensuring the safe and stable operation of the power system. Mode 1 prioritizes the adjustment of the active power of the photovoltaic system 502, and stores the active power of the energy storage system 501 for standby use, so as to provide short-circuit support capabilities for the power grid system. When a fault occurs in the power grid system, the energy storage system 501 can provide active power to the power grid system in a timely manner, thereby protecting the power grid system.

[0092] Step 202: When the actual frequency of the power grid system is greater than the upper limit of the dead zone, determine whether the SOC value of the energy storage system 501 is between the preset SOC minimum value and the preset SOC maximum value and whether the actual active power of the photovoltaic system 502 is equal to zero. If both are yes, the energy storage system 501 participates in the primary frequency regulation, and the photovoltaic system 502 does not participate in the primary frequency regulation of the photovoltaic power station.

[0093] Specifically, when the actual frequency of the power grid system is greater than the upper limit of the dead zone, according to the SOC value of the energy storage system 501 and the actual active power P of the photovoltaic system 502 ph , determine whether the energy storage system 501 and the photovoltaic system 502 participate in the primary frequency regulation of the photovoltaic power station.

[0094] If the SOC value of the energy storage system 501 is between SOC min +5%≤SOC2≤SOC max The energy storage system 501 has a charging function and participates in a frequency modulation. ph =0, the photovoltaic system 502 does not participate in the primary frequency regulation. That is, mode 2 is that the energy storage system 501 participates in the primary frequency regulation, and the photovoltaic system 502 does not participate in the primary frequency regulation.

[0095] Among them, when the actual active power P of the photovoltaic system 502 ph =0, the photovoltaic system 502 has no active power output, so it cannot participate in primary frequency regulation.

[0096] In this embodiment, when the actual frequency of the power grid system is too high, since the photovoltaic power station has no light, the actual active power of the photovoltaic system 502 is zero and cannot participate in the primary frequency modulation. Therefore, mode 2 stores the electric energy of the power grid in the energy storage system 501 (i.e., the energy storage system 501 is charged) to reduce the actual frequency of the power grid system, thereby ensuring the safe and stable operation of the power system.

[0097] Step 203: When the actual frequency of the power grid system is greater than the upper limit of the dead zone, it is determined whether the SOC value of the energy storage system 501 is between the preset SOC maximum value and 1 and whether the active power output of the photovoltaic system 502 is greater than or equal to the preset threshold. If both are yes, the energy storage system 501 does not participate in the primary frequency regulation, and the photovoltaic system 502 participates in the primary frequency regulation of the photovoltaic power station. The preset threshold is 12%.

[0098] Specifically, when the actual frequency of the power grid system is greater than the upper limit of the dead zone, the energy storage system 501 and the photovoltaic system 502 are judged whether to participate in the primary frequency regulation of the photovoltaic power station according to the SOC value of the energy storage system 501 and the active power output of the photovoltaic system 502.

[0099] If the SOC value of the energy storage system 501 is between SOC max <SOC3≤1, the energy storage system 501 is prohibited from charging, and the energy storage system 501 does not participate in the primary frequency regulation. If the active power output of the photovoltaic system 502 accounts for ≥12% of the total active power output of the photovoltaic system 502, the photovoltaic system 502 participates in the primary frequency regulation. That is, mode three is that the energy storage system 501 does not participate in the primary frequency regulation, and the photovoltaic system 502 participates in the primary frequency regulation.

[0100] When the photovoltaic system 502 participates in primary frequency regulation alone, the percentage of the active power output by the photovoltaic system 502 to the total active power that the photovoltaic system 502 can output should be greater than or equal to 12%.

[0101] Because the actual frequency of the power grid system is greater than the rated frequency, the maximum regulation amount of the photovoltaic power station is 10%, that is, the maximum regulation amount that the photovoltaic system 502 needs to reduce is 10% of the active power of the photovoltaic power station.

[0102] Because the energy storage system 501 does not participate in the primary frequency regulation at this time, the total active power that needs to be reduced in the photovoltaic power station must be borne entirely by the photovoltaic system 502, and because the photovoltaic system 502 and the energy storage system 501 account for 90% and 10% of the total active power of the photovoltaic power station respectively (i.e. 90% photovoltaic + 10% energy storage = 100% total active power). Therefore, the percentage of the photovoltaic system 502 regulating the total active power of the photovoltaic power station should be (90% * the percentage of the active power output of the photovoltaic system 502 in the total active power that the photovoltaic system 502 can output).

[0103] For example, if the percentage of the active power output of the photovoltaic system 502 to the total active power that the photovoltaic system 502 can output is 12%, then the active power output of the photovoltaic system 502 accounts for 90%*12%=10.8% of the total active power of the photovoltaic power station, and the maximum regulation amount of 10% can be met at this time. Therefore, the percentage of the active power output of the photovoltaic system 502 to the total active power that the photovoltaic system 502 can output should be greater than or equal to 12%.

[0104] In this embodiment, when the actual frequency of the power grid system is too high, since the energy storage system 501 does not have a charging function, mode three adjusts the active power of the photovoltaic system 502 to reduce the output of the photovoltaic system 502, so as to reduce the actual frequency of the power grid system, thereby ensuring the safe and stable operation of the power system.

[0105] Step 204: When the actual frequency of the power grid system is greater than the upper limit of the dead zone, determine whether the SOC value of the energy storage system 501 is between the preset SOC maximum value and 1 and whether the actual active power of the photovoltaic system 502 is equal to zero. If both are yes, the energy storage system 501 and the photovoltaic system 502 do not participate in the primary frequency regulation of the photovoltaic power station.

[0106] Specifically, when the actual frequency of the power grid system is greater than the upper limit of the dead zone, according to the SOC value of the energy storage system 501 and the actual active power P of the photovoltaic system 502 ph , determine whether the energy storage system 501 and the photovoltaic system 502 participate in the primary frequency regulation of the photovoltaic power station.

[0107] If the SOC value of the energy storage system 501 is between SOC max <SOC3≤1, the energy storage system 501 is prohibited from charging, and the energy storage system 501 does not participate in the primary frequency regulation. ph =0, the photovoltaic system 502 does not participate in the primary frequency regulation. That is, mode 4 is that the energy storage system 501 and the photovoltaic system 502 do not participate in the primary frequency regulation.

[0108] In this embodiment, when the actual frequency of the power grid system is too high, the photovoltaic system 502 has no active power output because the energy storage system 501 does not have a charging function and the photovoltaic power station has no light. Therefore, in mode 4, the energy storage system 501 and the photovoltaic system 502 cannot participate in the primary frequency regulation.

[0109] When the actual frequency of the power grid system is less than the lower limit of the dead zone (i.e., the actual frequency of the power grid system is relatively small), the energy storage system 501 and the photovoltaic system 502 are judged whether to participate in the primary frequency regulation of the photovoltaic power station according to the SOC value of the energy storage system 501, the actual active power of the photovoltaic system 502, and the active power output of the photovoltaic system 502.

[0110] Step 205: When the actual frequency of the power grid system is less than the lower limit of the dead zone, determine whether the SOC value of the energy storage system 501 is between the preset SOC minimum value and the preset SOC maximum value and whether the actual active power of the photovoltaic system 502 is not equal to zero. If both are yes, the energy storage system 501 and the photovoltaic system 502 both participate in the primary frequency regulation of the photovoltaic power station.

[0111] Specifically, when the actual frequency of the power grid system is less than the lower limit of the dead zone, according to the SOC value of the energy storage system 501 and the actual active power P of the photovoltaic system 502 ph , determine whether the energy storage system 501 and the photovoltaic system 502 participate in the primary frequency regulation of the photovoltaic power station.

[0112] If the SOC value of the energy storage system 501 is between SOC min +5%≤SOC2≤SOC max The energy storage system 501 has a discharge function and participates in a frequency modulation. ph ≠0, the photovoltaic system 502 participates in the primary frequency regulation. That is, mode 5 is that both the energy storage system 501 and the photovoltaic system 502 participate in the primary frequency regulation.

[0113] In this embodiment, when the actual frequency of the power grid system is low, the energy storage system 501 is discharged and the active power of the photovoltaic system 502 is adjusted to increase the output of the photovoltaic system 502, so as to improve the actual frequency of the power grid system and ensure the safe and stable operation of the power system. Mode 5 stores the active power of the energy storage system 501 for backup by preferentially adjusting the active power of the photovoltaic system 502, so as to provide short-circuit support capability for the power grid system. When a fault occurs in the power grid system, the energy storage system 501 can provide active power to the power grid system in a timely manner, thereby protecting the power grid system.

[0114] Step 206: When the actual frequency of the power grid system is less than the lower limit of the dead zone, determine whether the SOC value of the energy storage system 501 is between the preset SOC minimum value and the preset SOC maximum value and whether the actual active power of the photovoltaic system 502 is equal to zero. If both are yes, the energy storage system 501 participates in the primary frequency regulation, and the photovoltaic system 502 does not participate in the primary frequency regulation of the photovoltaic power station.

[0115] Specifically, when the actual frequency of the power grid system is less than the lower limit of the dead zone, according to the SOC value of the energy storage system 501 and the actual active power P of the photovoltaic system 502 ph , determine whether the energy storage system 501 and the photovoltaic system 502 participate in the primary frequency regulation of the photovoltaic power station.

[0116] If the SOC value of the energy storage system 501 is between SOC min +5%≤SOC2≤SOC max The energy storage system 501 has a discharge function and participates in a frequency modulation. If the actual active power P of the photovoltaic system 502 ph =0, the photovoltaic system 502 does not participate in the primary frequency regulation. That is, mode six is ​​that the energy storage system 501 participates in the primary frequency regulation, and the photovoltaic system 502 does not participate in the primary frequency regulation.

[0117] Among them, when the actual active power P of the photovoltaic system 502 ph =0, the photovoltaic system 502 has no active power output, so it cannot participate in primary frequency regulation.

[0118] In this embodiment, when the actual frequency of the power grid system is low, since the photovoltaic power station has no light, the actual active power of the photovoltaic system 502 is zero and cannot participate in the primary frequency modulation. Therefore, mode six discharges the energy storage system 501 to increase the actual frequency of the power grid system, thereby ensuring the safe and stable operation of the power system.

[0119] Step 207: When the actual frequency of the power grid system is less than the lower limit of the dead zone, it is determined whether the SOC value of the energy storage system 501 is between zero and the preset SOC minimum value and whether the active power output of the photovoltaic system 502 is greater than or equal to the preset threshold. If both are yes, the energy storage system 501 does not participate in the primary frequency regulation, and the photovoltaic system 502 participates in the primary frequency regulation of the photovoltaic power station. The preset threshold is 12%.

[0120] Specifically, when the actual frequency of the power grid system is less than the lower limit of the dead zone, the energy storage system 501 and the photovoltaic system 502 are judged whether to participate in the primary frequency regulation of the photovoltaic power station according to the SOC value of the energy storage system 501 and the active power output of the photovoltaic system 502.

[0121] If the SOC value of the energy storage system 501 is between 0≤SOC1<SOC min +5%, the energy storage system 501 is prohibited from discharging, and the energy storage system 501 does not participate in the primary frequency regulation. If the percentage of the active power output of the photovoltaic system 502 to the total active power output of the photovoltaic system 502 is ≥12%, the photovoltaic system 502 participates in the primary frequency regulation. That is, mode seven is that the energy storage system 501 does not participate in the primary frequency regulation, and the photovoltaic system 502 participates in the primary frequency regulation.

[0122] When the photovoltaic system 502 participates in primary frequency regulation alone, the percentage of the active power output by the photovoltaic system 502 to the total active power that the photovoltaic system 502 can output should be greater than or equal to 12%.

[0123] In this embodiment, when the actual frequency of the power grid system is relatively low, since the energy storage system 501 does not have a discharge function, mode seven adjusts the active power of the photovoltaic system 502 to increase the output of the photovoltaic system 502, so as to increase the actual frequency of the power grid system, thereby ensuring the safe and stable operation of the power system.

[0124] Step 208: When the actual frequency of the power grid system is less than the lower limit of the dead zone, determine whether the SOC value of the energy storage system 501 is between zero and the preset SOC minimum value and whether the actual active power of the photovoltaic system 502 is equal to zero. If both are yes, the energy storage system 501 and the photovoltaic system 502 do not participate in the primary frequency regulation of the photovoltaic power station.

[0125] Specifically, when the actual frequency of the power grid system is less than the lower limit of the dead zone, according to the SOC value of the energy storage system 501 and the actual active power P of the photovoltaic system 502 ph , determine whether the energy storage system 501 and the photovoltaic system 502 participate in the primary frequency regulation of the photovoltaic power station.

[0126] If the SOC value of the energy storage system 501 is between 0≤SOC1<SOC min +5%, the energy storage system 501 is prohibited from discharging, and the energy storage system 501 participates in primary frequency regulation. ph = 0, the photovoltaic system 502 does not participate in the primary frequency regulation. Mode 8 is that neither the energy storage system 501 nor the photovoltaic system 502 participates in the primary frequency regulation.

[0127] In this embodiment, when the actual frequency of the power grid system is low, the photovoltaic system 502 has no active power output because the energy storage system 501 does not have a discharge function and the photovoltaic power station has no light. Therefore, in mode eight, both the energy storage system 501 and the photovoltaic system 502 cannot participate in the primary frequency regulation.

[0128] Step 104: If the energy storage system 501 and / or the photovoltaic system 502 participate in the primary frequency regulation of the photovoltaic power station, a primary frequency regulation algorithm is selected to determine the change in active power of the power station and the primary frequency regulation adjustment amount of the photovoltaic system 502, and primary frequency regulation control is performed according to the change in active power of the power station and the primary frequency regulation adjustment amount of the photovoltaic system.

[0129] Specifically, the above primary frequency modulation algorithm includes formula (1) to formula (4).

[0130] Formula (1):

[0131] Wherein, ΔP is the active power change of the photovoltaic power station, in megawatts (MW); K f is the active frequency modulation coefficient, K f The value range is 10 to 50; Δf is the frequency deviation of the power grid system, in Hertz (Hz); f N is the rated frequency of the power grid system, in Hertz (Hz), f N The value is 50Hz.

[0132] Formula (2): Δf = f s -fN ;

[0133] Wherein, Δf is the frequency deviation of the power grid system, in Hertz (Hz); f N is the rated frequency of the power grid system, in Hertz (Hz), f N The value is 50Hz; f s It is the actual frequency of the power grid system, in Hertz (Hz).

[0134] Formula (3):

[0135] Where ΔP 光 is the adjustment amount of the primary frequency regulation of the photovoltaic system 502; P 光 is the actual installed capacity of the photovoltaic system 502 in the photovoltaic power station, in megawatts (MW); K f is the active frequency modulation coefficient, K f The value range is 10 to 50; Δf is the frequency deviation of the power grid system, in Hertz (Hz); f N is the rated frequency of the power grid system, in Hertz (Hz), f N The value is 50Hz.

[0136] Formula (4): ΔP = ΔP 光 +ΔP 储 ;

[0137] Wherein, ΔP is the active power change of the photovoltaic power station, in megawatts (MW); ΔP 光 is the adjustment amount of the primary frequency regulation of the photovoltaic system 502, in megawatts (MW); ΔP 储 It is the adjustment amount of the primary frequency regulation of the energy storage system 501, in megawatts (MW).

[0138] like Figure 4 As shown, step 104 includes steps 401 to 403 .

[0139] Step 401: If both the energy storage system 501 and the photovoltaic system 502 participate in primary frequency regulation, select formula (3) to calculate the active power required for the primary frequency regulation of the photovoltaic system 502, and select formula (4) to calculate the active power required for the primary frequency regulation of the energy storage system 501.

[0140] Specifically, when the actual frequency of the power grid system is too high, the active power required for the primary frequency regulation of the photovoltaic system 502, that is, the adjustment amount of the primary frequency regulation that the photovoltaic system 502 needs to reduce is ΔP 光 , and the ΔP calculated according to formula (3) 光 Sent to the photovoltaic system 502, so that the output of the photovoltaic system 502 is reduced by ΔP 光Since when both the energy storage system 501 and the photovoltaic system 502 participate in the primary frequency regulation, the photovoltaic system 502 cannot complete the primary frequency regulation alone, and the remaining required active power reduction of the photovoltaic power station is borne by the energy storage system 501. Therefore, the active power required for the primary frequency regulation of the energy storage system 501, that is, the change in the active power of the photovoltaic power station that the energy storage system 501 needs to reduce is ΔP 储 , and the ΔP calculated according to formula (4) 储 Send it to the energy storage system 501, so that the energy storage system 501 changes ΔP 储 This part of electrical energy is stored, thereby reducing the actual frequency of the power grid system.

[0141] When the actual frequency of the power grid system is low, the active power required for the primary frequency regulation of the photovoltaic system 502, that is, the adjustment amount of the primary frequency regulation of the photovoltaic system 502 is ΔP 光 , and the ΔP calculated according to formula (3) 光 Sent to the photovoltaic system 502, so that the output of the photovoltaic system 502 increases by ΔP 光 Since the photovoltaic system 502 cannot complete the primary frequency regulation alone, the remaining active power required to increase the photovoltaic power station is borne by the energy storage system 501. Therefore, the active power required for the primary frequency regulation of the energy storage system 501, that is, the change in the active power of the photovoltaic power station that the energy storage system 501 needs to increase is ΔP 储 , and the ΔP calculated according to formula (4) 储 Sent to the energy storage system 501, so that the energy storage system 501 releases ΔP 储 This part of electricity can improve the actual frequency of the power grid system.

[0142] In one embodiment, since the photovoltaic system 502 cannot complete the frequency regulation alone, the remaining active power required to increase the photovoltaic power station is borne by the energy storage system 501. For example, when the actual frequency of the power grid system is too high, it is necessary to reduce the total active power of the photovoltaic power station by 10% (the total active power of the photovoltaic power station is 90% photovoltaic + 10% energy storage = 100% total active power), then the percentage of active power output by the photovoltaic system 502 to the total active power of the photovoltaic power station is 90%*10%=9%, so the remaining 1% of the total active power of the photovoltaic power station needs to be borne by the energy storage system 501, that is, the energy storage system 501 stores the remaining 1% of the total active power of the photovoltaic power station.

[0143] Step 402: If the energy storage system 501 participates in the primary frequency regulation and the photovoltaic system 502 does not participate in the primary frequency regulation, select formula (1) to calculate the active power required for the primary frequency regulation of the energy storage system 501.

[0144] Specifically, when the actual frequency of the power grid system is too high, since the photovoltaic system 502 does not participate in the primary frequency regulation, the active power required for the primary frequency regulation of the photovoltaic power station is borne by the energy storage system 501. Therefore, the active power required for the primary frequency regulation of the energy storage system 501, that is, the energy storage system 501 needs to reduce the active power change of the photovoltaic power station by ΔP, and send the ΔP calculated according to formula (1) to the energy storage system 501, so that the energy storage system 501 stores the ΔP part of the electric energy, thereby reducing the actual frequency of the power grid system.

[0145] When the actual frequency of the power grid system is low, since the photovoltaic system 502 does not participate in the primary frequency regulation, the active power required for the primary frequency regulation of the photovoltaic power station is provided by the energy storage system 501. Therefore, the active power required for the primary frequency regulation of the energy storage system 501, that is, the energy storage system 501 needs to increase the active power change of the photovoltaic power station by ΔP, and send the ΔP calculated according to formula (1) to the energy storage system 501, so that the energy storage system 501 releases the electric energy of ΔP, thereby improving the actual frequency of the power grid system.

[0146] Step 403: If the energy storage system 501 does not participate in the primary frequency regulation and the photovoltaic system 502 participates in the primary frequency regulation, formula (1) is selected to calculate the active power required for the primary frequency regulation of the photovoltaic system 502.

[0147] Specifically, when the actual frequency of the power grid system is too high, since the energy storage system 501 does not participate in the primary frequency regulation, the active power required for the primary frequency regulation of the photovoltaic power station is provided by the photovoltaic system 502. Therefore, the active power required for the primary frequency regulation of the photovoltaic system 502, that is, the amount of active power change of the photovoltaic power station that the photovoltaic system 502 needs to reduce is ΔP, and the ΔP calculated according to formula (1) is sent to the photovoltaic system 502, so that the output of the photovoltaic system 502 is reduced by ΔP, thereby reducing the actual frequency of the power grid system.

[0148] When the actual frequency of the power grid system is low, since the energy storage system 501 does not participate in the primary frequency regulation, the active power required for the primary frequency regulation of the photovoltaic power station is provided by the photovoltaic system 502. Therefore, the active power required for the primary frequency regulation of the photovoltaic system 502, that is, the change in the active power of the photovoltaic power station that the photovoltaic system 502 needs to increase is ΔP, and the ΔP calculated according to formula (1) is sent to the photovoltaic system 502, so that the output of the photovoltaic system 502 increases by ΔP, thereby improving the actual frequency of the power grid system.

[0149] In this embodiment, by judging whether the energy storage system 501 and the photovoltaic system 502 participate in the primary frequency modulation, if the above systems participate in the primary frequency modulation, combined with the actual active power of the energy storage system 501 and the photovoltaic system 502, the active power required for the primary frequency modulation of the photovoltaic power station is allocated after calculation and analysis through the primary frequency modulation algorithm, so as to accurately allocate the active power required for the primary frequency modulation of the photovoltaic power station to the energy storage system 501 and the photovoltaic system 502, which helps to improve the frequency of the power grid system and ensure the safe and stable operation of the power grid system.

[0150] Figure 5 This is a signal acquisition connection diagram for a photovoltaic power station provided by the present invention. Figure 5 As shown, the photovoltaic power station includes: an energy storage system 501, a photovoltaic system 502, an energy storage converter 503, a photovoltaic inverter 504, a wind turbine 505, a transformer 506, a data acquisition, calculation and distribution device 507, a collection bus 508 and an outgoing bus 509.

[0151] In one embodiment, a digital signal processor TMS28332 chip can be used as a control chip. The chip has multiple pulse output channels, rich pin resources, and an enhanced USART module. The digital signal processor TMS28332 chip supports multiple communication protocols such as RS-485 and RS-232. Through a professional program compiler, write C language program code, and pre-program the test items to be carried out in the program, then download the program code to the digital signal processor TMS28332 chip through the digital signal processor and the burner, and write the above communication protocol to realize the communication between the primary frequency modulation control system and the host computer.

[0152] The present invention also provides a primary frequency regulation control device for a grid-type photovoltaic power station, as described in the following embodiments. Since the principle of the device to solve the problem is similar to the primary frequency regulation control method for a grid-type photovoltaic power station, the implementation of the device can refer to the implementation of the primary frequency regulation control method for a grid-type photovoltaic power station, and the repeated parts will not be repeated.

[0153] like Figure 6 As shown, a primary frequency regulation control device 600 of a grid-type photovoltaic power station includes: a frequency acquisition module 601, a frequency judgment module 602, a primary frequency regulation judgment module 603 and a primary frequency regulation adjustment amount determination module 604.

[0154] The frequency acquisition module 601 is used to obtain the actual frequency of the power grid system.

[0155] The frequency determination module 602 is used to compare the actual frequency with a preset dead zone threshold to determine whether the actual frequency exceeds the preset dead zone interval.

[0156] The primary frequency regulation judgment module 603 is used to judge whether the energy storage system 501 and the photovoltaic system 502 participate in the primary frequency regulation of the photovoltaic power station according to the SOC value of the energy storage system 501, the actual active power of the photovoltaic system 502 and the active power output of the photovoltaic system 502 if the actual frequency exceeds the dead zone.

[0157] The primary frequency regulation amount determination module 604 is used to select a primary frequency regulation algorithm to determine the active power change of the power station and the primary frequency regulation amount of the photovoltaic system 502 if the energy storage system 501 and / or the photovoltaic system 502 participate in the primary frequency regulation.

[0158] In one embodiment, the primary frequency modulation determination module 603 includes: a first frequency modulation determination unit.

[0159] When the actual frequency is greater than the upper limit value of the dead zone, the first frequency modulation judgment unit is used to judge whether the SOC value is between the preset SOC minimum value and the preset SOC maximum value and whether the actual active power is not equal to zero. If both are yes, the energy storage system 501 and the photovoltaic system 502 both participate in the primary frequency modulation.

[0160] In one embodiment, the primary frequency modulation determination module 603 further includes: a second frequency modulation determination unit.

[0161] When the actual frequency is greater than the upper limit value of the dead zone interval, the second frequency modulation judgment unit is used to determine whether the SOC value is between the preset SOC minimum value and the preset SOC maximum value and whether the actual active power is equal to zero. If both are yes, the energy storage system 501 participates in the primary frequency modulation, and the photovoltaic system 502 does not participate in the primary frequency modulation.

[0162] In one embodiment, the primary frequency modulation determination module 603 further includes: a third frequency modulation determination unit.

[0163] When the actual frequency is greater than the upper limit value of the dead zone interval, the third frequency modulation judgment unit is used to determine whether the SOC value is between the preset SOC maximum value and 1 and whether the active power output of the photovoltaic system 502 is greater than or equal to the preset threshold. If both are yes, the energy storage system 501 does not participate in the primary frequency modulation, and the photovoltaic system 502 participates in the primary frequency modulation.

[0164] In one embodiment, the primary frequency modulation determination module 603 further includes: a fourth frequency modulation determination unit.

[0165] When the actual frequency is greater than the upper limit of the dead zone, the fourth frequency modulation judgment unit is used to judge whether the SOC value is between the preset SOC maximum value and 1 and whether the actual active power is equal to zero. If both are yes, the energy storage system 501 and the photovoltaic system 502 do not participate in the primary frequency modulation.

[0166] In one embodiment, the primary frequency modulation determination module 603 further includes: a fifth frequency modulation determination unit.

[0167] When the actual frequency is less than the lower limit of the dead zone, the fifth frequency modulation judgment unit is used to judge whether the SOC value is between the preset SOC minimum value and the preset SOC maximum value and whether the actual active power is not equal to zero. If both are yes, the energy storage system 501 and the photovoltaic system 502 both participate in the primary frequency modulation.

[0168] In one embodiment, the primary frequency modulation determination module 603 further includes: a sixth frequency modulation determination unit.

[0169] When the actual frequency is less than the lower limit of the dead zone, the sixth frequency modulation judgment unit is used to judge whether the SOC value is between the preset SOC minimum value and the preset SOC maximum value and whether the actual active power is equal to zero. If both are yes, the energy storage system 501 participates in the primary frequency modulation, and the photovoltaic system 502 does not participate in the primary frequency modulation.

[0170] In one embodiment, the primary frequency modulation determination module 603 further includes: a seventh frequency modulation determination unit.

[0171] When the actual frequency is less than the lower limit of the dead zone, the seventh frequency modulation judgment unit is used to judge whether the SOC value is between zero and the preset SOC minimum value and whether the active power output of the photovoltaic system 502 is greater than or equal to the preset threshold. If both are yes, the energy storage system 501 does not participate in the primary frequency modulation, and the photovoltaic system 502 participates in the primary frequency modulation.

[0172] In one embodiment, the primary frequency modulation determination module 603 further includes: an eighth frequency modulation determination unit.

[0173] When the actual frequency is less than the lower limit of the dead zone, the eighth frequency modulation judgment unit is used to judge whether the SOC value is between zero and the preset SOC minimum value and whether the actual active power is equal to zero. If both are yes, the energy storage system 501 and the photovoltaic system 502 do not participate in the primary frequency modulation.

[0174] Figure 7 A schematic diagram of the physical structure of an electronic device 700 provided in an embodiment of the present invention, such as Figure 7 As shown, the electronic device 700 includes a processor 701 , a memory 702 and a bus 703 .

[0175] The processor 701 and the memory 702 communicate with each other via the bus 703 .

[0176] The processor 701 is used to call the program instructions in the memory 702 to execute the methods provided by the above-mentioned method embodiments.

[0177] An embodiment of the present invention further provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the primary frequency modulation control method of the above-mentioned grid-type photovoltaic power station is implemented.

[0178] An embodiment of the present invention further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the primary frequency modulation control method of the grid-type photovoltaic power station is implemented.

[0179] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0180] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0181] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0182] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0183] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A primary frequency modulation control method for a grid-type photovoltaic power station, characterized in that: include: Acquire the actual frequency of the power grid system connected to the photovoltaic power station; wherein the photovoltaic power station includes an energy storage system and a photovoltaic system; Compare the actual frequency with a preset dead zone interval to determine whether the actual frequency exceeds the dead zone interval; If the actual frequency exceeds the dead zone, determine whether the energy storage system and the photovoltaic system participate in the primary frequency regulation of the photovoltaic power station according to the SOC value of the energy storage system, the actual active power of the photovoltaic system and the active power output of the photovoltaic system; If the energy storage system and / or the photovoltaic system participate in primary frequency regulation, a primary frequency regulation algorithm is selected to determine the change in active power of the power station and the primary frequency regulation adjustment amount of the photovoltaic system, and primary frequency regulation control is performed according to the change in active power of the power station and the primary frequency regulation adjustment amount of the photovoltaic system.

2. The method according to claim 1, characterized in that When the actual frequency is greater than the upper limit of the dead zone, judging whether the energy storage system and the photovoltaic system participate in the primary frequency regulation of the photovoltaic power station according to the SOC value of the energy storage system, the actual active power of the photovoltaic system and the active power output of the photovoltaic system includes: It is determined whether the SOC value is between a preset SOC minimum value and a preset SOC maximum value and whether the actual active power is not equal to zero. If both are yes, the energy storage system and the photovoltaic system both participate in a frequency modulation.

3. The method according to claim 1, characterized in that When the actual frequency is greater than the upper limit of the dead zone, judging whether the energy storage system and the photovoltaic system participate in the primary frequency regulation of the photovoltaic power station according to the SOC value of the energy storage system, the actual active power of the photovoltaic system and the active power output of the photovoltaic system includes: It is determined whether the SOC value is between a preset SOC minimum value and a preset SOC maximum value and whether the actual active power is equal to zero. If both are yes, the energy storage system participates in primary frequency modulation, and the photovoltaic system does not participate in primary frequency modulation.

4. The method according to claim 1, characterized in that: When the actual frequency is greater than the upper limit of the dead zone, judging whether the energy storage system and the photovoltaic system participate in the primary frequency regulation of the photovoltaic power station according to the SOC value of the energy storage system, the actual active power of the photovoltaic system and the active power output of the photovoltaic system includes: It is determined whether the SOC value is between a preset SOC maximum value and 1 and whether the active power output of the photovoltaic system is greater than or equal to a preset threshold. If both are yes, the energy storage system does not participate in primary frequency modulation, and the photovoltaic system participates in primary frequency modulation.

5. The method according to claim 1, characterized in that When the actual frequency is greater than the upper limit of the dead zone, judging whether the energy storage system and the photovoltaic system participate in the primary frequency regulation of the photovoltaic power station according to the SOC value of the energy storage system, the actual active power of the photovoltaic system and the active power output of the photovoltaic system includes: It is determined whether the SOC value is between a preset SOC maximum value and 1 and whether the actual active power is equal to zero. If both are yes, the energy storage system and the photovoltaic system do not participate in primary frequency modulation.

6. The method according to claim 1, characterized in that When the actual frequency is less than the lower limit of the dead zone, judging whether the energy storage system and the photovoltaic system participate in the primary frequency regulation of the photovoltaic power station according to the SOC value of the energy storage system, the actual active power of the photovoltaic system and the active power output of the photovoltaic system includes: It is determined whether the SOC value is between a preset SOC minimum value and a preset SOC maximum value and whether the actual active power is not equal to zero. If both are yes, the energy storage system and the photovoltaic system both participate in a frequency modulation.

7. The method according to claim 1, characterized in that When the actual frequency is less than the lower limit of the dead zone, judging whether the energy storage system and the photovoltaic system participate in the primary frequency regulation of the photovoltaic power station according to the SOC value of the energy storage system, the actual active power of the photovoltaic system and the active power output of the photovoltaic system includes: It is determined whether the SOC value is between a preset SOC minimum value and a preset SOC maximum value and whether the actual active power is equal to zero. If both are yes, the energy storage system participates in primary frequency modulation, and the photovoltaic system does not participate in primary frequency modulation.

8. The method according to claim 1, characterized in that When the actual frequency is less than the lower limit of the dead zone, judging whether the energy storage system and the photovoltaic system participate in the primary frequency regulation of the photovoltaic power station according to the SOC value of the energy storage system, the actual active power of the photovoltaic system and the active power output of the photovoltaic system includes: It is determined whether the SOC value is between zero and a preset SOC minimum value and whether the active power output of the photovoltaic system is greater than or equal to a preset threshold value. If both are yes, the energy storage system does not participate in primary frequency modulation, and the photovoltaic system participates in primary frequency modulation.

9. The method according to claim 1, characterized in that: When the actual frequency is less than the lower limit of the dead zone, judging whether the energy storage system and the photovoltaic system participate in the primary frequency regulation of the photovoltaic power station according to the SOC value of the energy storage system, the actual active power of the photovoltaic system and the active power output of the photovoltaic system includes: It is determined whether the SOC value is between zero and a preset SOC minimum value and whether the actual active power is equal to zero. If both are yes, the energy storage system and the photovoltaic system do not participate in primary frequency modulation.

10. A primary frequency modulation control device for a grid-type photovoltaic power station, characterized in that: include: Frequency acquisition module, used to obtain the actual frequency of the power grid system; A frequency determination module, used to compare the actual frequency with a preset dead zone threshold to determine whether the actual frequency exceeds a preset dead zone interval; A primary frequency regulation judgment module is used to judge whether the energy storage system and the photovoltaic system participate in the primary frequency regulation of the photovoltaic power station according to the SOC value of the energy storage system, the actual active power of the photovoltaic system and the active power output of the photovoltaic system if the actual frequency exceeds the dead zone interval; The primary frequency regulation amount determination module is used to select a primary frequency regulation algorithm to determine the active power change of the power station and the primary frequency regulation amount of the photovoltaic system if the energy storage system and / or the photovoltaic system participate in the primary frequency regulation.

11. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 1 to 9 is implemented.

12. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 9 is implemented.

13. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 9 is implemented.

Images