CN115411748A - Frequency adjusting method, device and system for photovoltaic power generation system - Google Patents

Frequency adjusting method, device and system for photovoltaic power generation system Download PDF

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CN115411748A
CN115411748A CN202211145884.0A CN202211145884A CN115411748A CN 115411748 A CN115411748 A CN 115411748A CN 202211145884 A CN202211145884 A CN 202211145884A CN 115411748 A CN115411748 A CN 115411748A
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power
generation system
power generation
inverters
total
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CN115411748B (en
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张浩东
张进
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SHANGHAI ZHENGTAI AUTOMATION SOFTWARE SYSTEM CO LTD
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SHANGHAI ZHENGTAI AUTOMATION SOFTWARE SYSTEM CO LTD
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H02J3/241—The oscillation concerning frequency
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/002—Flicker reduction, e.g. compensation of flicker introduced by non-linear load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Inverter Devices (AREA)

Abstract

The application provides a method, a device and a system for adjusting frequency of a photovoltaic power generation system, wherein the method comprises the following steps: acquiring total required power, the number of inverters in a normal operation state and total installed capacity, wherein the total required power is output power of the photovoltaic power generation system meeting the frequency regulation requirement of the photovoltaic power generation system; under the condition that the total required power is a famous value, calculating to obtain a power thousandth ratio according to the total required power, the number of inverters in a normal operation state and the total installed capacity, wherein the power thousandth ratio is in a thousandth form of the ratio of the total required power to the maximum output power of the photovoltaic power generation system; and controlling the inverter to output required power so as to adjust the frequency of the photovoltaic power generation system, wherein the required power is the product of the rated power and the power thousandth ratio of the inverter. The method solves the problem that a data collector of a photovoltaic power generation system in the prior art cannot convert the form of power transmitted by a rapid frequency modulation device into the form of power which can be received by an inverter.

Description

Frequency adjusting method, device and system for photovoltaic power generation system
Technical Field
The application relates to the technical field of new energy power generation, in particular to a method and a device for adjusting frequency of a photovoltaic power generation system, a computer-readable storage medium, a processor and an adjusting system.
Background
At present, under the large background of carbon neutralization in China and even in the world, new energy power stations in China develop rapidly, particularly in the field of photovoltaic power stations, the development trend is more rapid, solar energy is used as renewable clean energy which can be continuously utilized, the solar energy has huge development and application potential, the installed photovoltaic capacity is continuously increased, and good economic and social benefits are brought to China.
However, the photovoltaic belongs to intermittent renewable energy, is greatly influenced by external weather changes, and along with the continuous development and commissioning of ultrahigh voltage transmission lines in China, the operation characteristics of a power grid in China also change greatly, most obviously, the volatility and uncertainty of the power grid are obviously enhanced, frequency disturbance is also continuously increased, and transient overvoltage often occurs, so that the operation safety risk of the power grid is obviously increased, the primary frequency modulation capacity of the whole power grid system is in a descending trend due to large-scale grid connection of new energy, the frequency regulation capacity of the power grid is reduced, the frequency out-of-limit or even low-frequency load shedding action is easily caused, and the realization of the quick frequency response of a photovoltaic power station becomes a great thing influencing the whole power grid to ensure the safe operation of the power grid.
The existing data acquisition device matched with the rapid frequency modulation technology of the photovoltaic power station mostly adopts iec communication access rapid frequency modulation device, acquires the photovoltaic inverter through a modbus protocol, and only has the functions of data acquisition and forwarding, the existing technology cannot meet the rapid response required by the current rapid frequency modulation, and does not have a power regulation algorithm, and cannot adapt to the inverter power regulation modes of different manufacturers.
The above information disclosed in this background section is only for enhancement of understanding of the background of the technology described herein and, therefore, it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.
Disclosure of Invention
The present application mainly aims to provide a method, an apparatus, a computer-readable storage medium, a processor, and an adjustment system for adjusting a frequency of a photovoltaic power generation system, so as to solve a problem that a data collector cannot convert a form of power delivered by a fast frequency modulation apparatus into a form of power that an inverter can receive when adjusting the frequency of the photovoltaic power generation system in the prior art.
According to an aspect of an embodiment of the present application, a method for adjusting a frequency of a photovoltaic power generation system is provided, the photovoltaic power generation system includes a data acquisition device, a fast frequency modulation device and an inverter, the method is applied to the data acquisition device, the fast frequency modulation device and the inverter are both in communication connection with the data acquisition device, and the method includes: acquiring total required power, the number of the inverters in a normal operation state and total installed capacity, wherein the total required power is output power of the photovoltaic power generation system meeting the frequency regulation requirement of the photovoltaic power generation system; under the condition that the total required power is a famous value, calculating to obtain a power thousandth ratio according to the total required power, the number of the inverters in a normal operation state and the total installed capacity, wherein the power thousandth ratio is a thousandth form of a ratio of the total required power to the maximum output power of the photovoltaic power generation system; and controlling the inverter to output required power so as to adjust the frequency of the photovoltaic power generation system, wherein the required power is the product of the rated power of the inverter and the power thousandth ratio.
Optionally, before obtaining the total required power, the number of inverters in normal operation state and the total installed capacity, the method further comprises: receiving a first goose message sent by the fast frequency modulation device, wherein the first goose message comprises the total required power, and the format of the first goose message is 61850 model file format; and analyzing the first goose message to obtain the total required power.
Optionally, receiving the first goose message sent by the fast frequency modulation apparatus includes: receiving an original goose message sent by the fast frequency modulation device, wherein the original goose message is a message transmitted by adopting a physical layer protocol or a data link layer protocol; and determining the original goose message as the first goose message under the condition that the original goose message is a message transmitted by adopting the physical layer protocol.
Optionally, before obtaining the total required power, the number of inverters in a normal operation state, and the total installed capacity, the method further comprises: acquiring the running states of all the inverters, wherein the running states of the inverters comprise the normal running state and the fault state; determining the number of the inverters in the normal operation state according to the operation states of all the inverters.
Optionally, before calculating a power thousandth ratio according to the total required power, the number of the inverters in the normal operation state, and the total installed capacity, the method further includes: triggering an internal interrupt instruction to stop the internal ongoing work of the data collector.
Optionally, calculating a power thousandth ratio according to the total required power, the number of the inverters in the normal operation state, and the total installed capacity, and including: calculating the ratio of the number of the inverters in the normal operation state to the total number of the inverters to obtain an operation proportion; calculating the product of the total installed capacity and the operation proportion to obtain the maximum output power; calculating the ratio of the total required power to the maximum output power to obtain a power ratio; and calculating the product of the power proportion and 1000 to obtain the power thousandth ratio.
Optionally, before controlling the inverter to output the required power to adjust the frequency of the photovoltaic power generation system, the method further comprises: and sending the power thousandths to the inverter in a serial communication mode.
Optionally, after controlling the inverter to output the required power to adjust the frequency of the photovoltaic power generation system, the method further comprises: acquiring the running state and output power of the inverter; assembling the operating state and the output power of the inverter into a second goose message, wherein the second goose message is in the 61850 model file format; and sending the second goose message to the fast frequency modulation device.
According to another aspect of the embodiment of the present application, a device for adjusting the frequency of a photovoltaic power generation system is further provided, the photovoltaic power generation system includes a data acquisition device, a fast frequency modulation device and an inverter, the adjusting device is applied to the data acquisition device, the fast frequency modulation device and the inverter are both in communication connection with the data acquisition device, the device includes: the acquiring unit is used for acquiring total required power, the number of the inverters in a normal operation state and total installed capacity, wherein the total required power is output power of the photovoltaic power generation system meeting the frequency regulation requirement of the photovoltaic power generation system; the calculating unit is used for calculating a power thousandth ratio according to the total required power, the number of the inverters in a normal operation state and the total installed capacity under the condition that the total required power is a named value, wherein the power thousandth ratio is a thousandth form of a ratio of the total required power to the maximum output power of the photovoltaic power generation system; and the control unit is used for controlling the inverter to output required power so as to adjust the frequency of the photovoltaic power generation system, wherein the required power is the product of the rated power of the inverter and the power thousandth ratio.
According to still another aspect of embodiments of the present application, there is also provided a computer-readable storage medium including a stored program, wherein the program performs any one of the methods.
According to yet another aspect of the embodiments of the present application, there is also provided a processor for executing a program, where the program executes to perform any one of the methods.
According to an aspect of the embodiments of the present application, there is also provided a system for adjusting a frequency of a photovoltaic power generation system, including: a photovoltaic power generation system, one or more processors, a memory, and one or more programs, wherein the photovoltaic power generation system comprises a data collector, a fast frequency modulation device, and an inverter, the one or more programs being stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for performing any of the methods.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
FIG. 1 shows a flow chart of a method of regulating a frequency of a photovoltaic power generation system according to an embodiment of the present application;
FIG. 2 shows a schematic diagram of a photovoltaic power generation system according to an embodiment of the present application;
fig. 3 shows a schematic diagram of a device for adjusting the frequency of a photovoltaic power generation system according to an embodiment of the present application.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances in order to facilitate the description of the embodiments of the application herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. Also, in the specification and claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element or "connected" to the other element through a third element.
As mentioned in the background art, in the prior art, when the frequency of the photovoltaic power generation system is adjusted, the data collector cannot convert the form of the power sent by the fast frequency modulation device into the form of the power that can be received by the inverter.
According to an embodiment of the application, a method for adjusting the frequency of a photovoltaic power generation system is provided.
Fig. 1 is a flow chart of a method for adjusting a frequency of a photovoltaic power generation system according to an embodiment of the present application. As shown in fig. 1, the method comprises the steps of:
step S101, acquiring total required power, the number of the inverters in a normal operation state and total installed capacity, wherein the total required power is output power of the photovoltaic power generation system meeting the frequency regulation requirement of the photovoltaic power generation system;
step S102, under the condition that the total required power is a named value, calculating to obtain a power thousandth ratio according to the total required power, the number of the inverters in a normal operation state and the total installed capacity, wherein the power thousandth ratio is in a thousandth form of the ratio of the total required power to the maximum output power of the photovoltaic power generation system;
and step S103, controlling the inverter to output required power so as to adjust the frequency of the photovoltaic power generation system, wherein the required power is the product of the rated power of the inverter and the power thousandth ratio.
In the method for adjusting the frequency of the photovoltaic power generation system, firstly, total required power, the number of the inverters in a normal operation state and total installed capacity are obtained, wherein the total required power is output power of the photovoltaic power generation system meeting the frequency adjustment requirement of the photovoltaic power generation system; then, under the condition that the total required power is a famous value, calculating to obtain a power thousandth ratio according to the total required power, the number of the inverters in a normal operation state and the total installed capacity, wherein the power thousandth ratio is a thousandth form of a ratio of the total required power to the maximum output power of the photovoltaic power generation system; and finally, controlling the inverter to output required power so as to adjust the frequency of the photovoltaic power generation system, wherein the required power is the product of the rated power of the inverter and the power thousandth ratio. According to the method, the ratio of the output power of the photovoltaic power generation system meeting the frequency regulation requirement of the photovoltaic power generation system to the maximum output power of the photovoltaic power generation system is obtained by converting the famous value of the total required power into the power thousandths, then, the output power of each inverter is regulated according to the power thousandths, the output power of each inverter is the product of the power thousandths and the rated power of the inverter, the actual output power of the whole photovoltaic power generation system is ensured to be the total required power, and the purpose of regulating the frequency of the photovoltaic power generation system is achieved. The method solves the problem that the data acquisition unit cannot convert the form of the power transmitted by the rapid frequency modulation device into the form of the power which can be received by the inverter when the frequency of the photovoltaic power generation system is adjusted in the prior art.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than presented herein.
In an optional embodiment of the present application, as shown in fig. 2, in the whole photovoltaic power generation system, a goose protocol of a iec61850 communication protocol is adopted to access the fast frequency modulation device, an adjustment instruction of the fast frequency modulation device is forwarded to the data acquisition device through the switch in the form of a goose message, the data acquisition device performs fast response calculation processing, the data acquisition device calculates output power of inverters in the photovoltaic power generation system according to the adjustment instruction, and issues the calculated output power of each inverter in the form of a modbus broadcast message through a serial port 485 bus or power carrier equipment, each inverter receives the instruction and then performs fast response, and the fast frequency modulation device can receive line frequency acquired by the data acquisition device forwarded by the switch in real time and calculate a frequency adjustment curve.
In an optional embodiment of the application, a 61850 model file is generated according to telemetering and remote signaling data configured by an operation and maintenance tool, a source mac address and a destination mac address are configured in the 61850 model file, some parameter settings related to goose messages such as APPID, GOID, GOCBRef, dataSet, confRev and the like are configured, and after the 61850 model file is configured, the 61850 model file is taught to a device which needs to subscribe the goose messages, so that early preparation is made for goose communication.
In an optional embodiment of the present application, before obtaining the total required power, the number of the inverters in the normal operation state, and the total installed capacity, the method further includes: receiving a first goose message sent by the fast frequency modulation device, wherein the first goose message comprises the total required power, and the format of the first goose message is 61850 model file format; and analyzing the first goose message to obtain the total required power. In this embodiment, the fast frequency modulation device determines output power of a photovoltaic power generation system meeting a frequency regulation requirement of the photovoltaic power generation system according to a power-frequency characteristic curve of the photovoltaic power generation system, that is, determines total required power, then, the fast frequency modulation device assembles the total required power into a first goose message in a 61850 model file format, and forwards the first goose message to the data collector through the switch, the data collector extracts subscribed data, that is, the total required power, in the first goose message according to the model file format of the model 61850 issued by the fast frequency modulation device, that is, the fast frequency modulation device issues an adjustment instruction, the data collector processes the adjustment instruction at the first time after receiving the adjustment instruction, and displays an unprocessed instruction value on an operation and maintenance tool, so that a site debugging engineer performs a peer-to-peer operation, compared with a case that most of data collectors in the prior art adopt a iec communication protocol to access the fast frequency modulation device, the fast frequency modulation device of the application forwards the total required power to the data collector in a goose message form through the switch, that the data collector adopts a 3262 zxft Communication protocol to access the fast frequency modulation device, and the fast frequency modulation device of the photovoltaic power generation system meet the requirement of the fast frequency modulation device.
It should be noted that, when the communication between the fast frequency modulation device and the data collector is realized according to the goose transmission protocol, the data collector needs to parse a large number of first goose messages in the 61850 model file format, the data collector of the present application uses a fast parsing method in the linux system, the parsing method analyzes the first goose messages in the whole 61850 model file format at one time when analyzing the first goose messages in the 61850 model file format, and forms a corresponding tree structure in the memory, so that the content of the first goose messages in the whole 61850 model file format is arbitrarily accessed and parsed through a specific access interface, the parsing method adopts a lightweight parsing process, the correctness of the XML file is verified by using the DTD file, the parsing can be performed as long as the format of the XML file is correct, and the parsing method has a small code volume, is particularly suitable for fast parsing the goose messages in the 61850 model file format, has excellent parsing capability and portability, and can play a strong role in parsing the goose messages in the 61850 model file format.
In an optional embodiment of the present application, the receiving of the first goose message sent by the fast frequency modulation apparatus includes: receiving an original goose message sent by the fast frequency modulation device, wherein the original goose message is a message transmitted by adopting a physical layer protocol or a data link layer protocol; and determining that the original goose message is the first goose message when the original goose message is a message transmitted by the physical layer protocol. In this embodiment, according to the standard specification of a goose transmission protocol, the application uses a physical layer transmission fast frequency modulation device to send a first goose message to a data collector, the data collector uses a network packet capturing tool based on a linux system to innovatively use a network packet capturing interface, and uses a network packet capturing interface and a BPF filter to quickly receive the first goose message from a physical layer, specifically, the network packet capturing interface collects an original goose message from a network device, the original goose message may be from a data link layer or a physical layer, then the data collector copies the received original goose message to the BPF filter, a filtering rule of the BPF filter is to only retain the original goose message from the physical layer, the BPF filter judges whether the original goose message is from the physical layer to determine whether to receive the original goose message, in the case that the original goose message is determined to be from the physical layer, the original goose message is determined to be the first goose message, the BPF filter puts the first goose message to an application layer of the first goose application layer, and the application program of the first goose message is determined to be a fast transmission data packet, and the first goose message is not transmitted to the fast frequency modulation data collector in the case that the original goose message is a good transmission data is not capable of being transferred to the fast transmission device.
In an optional embodiment of the present application, before obtaining the total required power, the number of the inverters in the normal operation state, and the total installed capacity, the method further includes: acquiring the running states of all the inverters, wherein the running states of the inverters comprise the normal running state and the fault state; determining the number of the inverters in the normal operation state according to the operation states of all the inverters. In the embodiment, the photovoltaic power generation system is divided into a plurality of areas, the areas are divided according to the planning construction of the photovoltaic power generation system, one data acquisition unit acquires data of one area, the data acquisition unit in the current area acquires the operation state of each inverter in the current area and various power generation data parameter information in real time, then, the operation state of each inverter in the current area is calculated, the operation number of the inverters in the current area of the photovoltaic power generation system is calculated, namely, the number of the inverters in the normal operation state in the current area of the photovoltaic power generation system is determined, then, the number of the inverters in the normal operation state is stored in a database, the real-time output power of each inverter in the current area is calculated in real time, the real-time total output power of the current area of the photovoltaic power generation system is calculated, the installed capacity of the current area, the current operation number of the inverters in the current area and the real-time total output power of the current area are displayed on an operation and maintenance tool, and debugging engineers can conveniently conduct on-site investigation and point alignment.
In an optional embodiment of the application, before calculating the power thousandths according to the total required power, the number of the inverters in the normal operation state, and the total installed capacity, the method further includes: and triggering an internal interrupt instruction to stop the internal ongoing work of the data acquisition unit. In the embodiment, after a data acquisition unit receives a first goose message of a fast frequency modulation device and extracts total required power in the first goose message, namely a control instruction of the fast frequency modulation device is received by the data acquisition unit, a protocol command forwarding unit arranged in the data acquisition unit triggers an internal interrupt instruction to control other ongoing work interrupts in the data acquisition unit, the number of inverters in a normal operation state, the total number of the inverters and the total installed capacity are immediately obtained from a database, a power thousandth ratio needing to be issued to the inverters is calculated according to the total required power, the number of the inverters in a normal operation state, the total number of the inverters and the total installed capacity, a forwarding value forwarded to the inverters is calculated in real time, and then the forwarding value is assembled into a message according to a modbus communication protocol and is forwarded to each inverter.
In an optional embodiment of the present application, calculating a power thousandth ratio according to the total required power, the number of the inverters in a normal operation state, and the total installed capacity includes: calculating the inverse of the normal operating stateObtaining the ratio of the number of converters to the total number of the inverters to obtain an operation ratio; calculating the product of the total installed capacity and the operation proportion to obtain the maximum output power; calculating the ratio of the total required power to the maximum output power to obtain a power ratio; and calculating the product of the power proportion and 1000 to obtain the power thousandth ratio. In this embodiment, most of inverters applied in the current photovoltaic power generation system can only receive total required power in the form of a thousandth, that is, receive a power instruction in the form of a thousandth, when the total required power issued to the data collector by the fast frequency modulation device is in the form of a named value, the data collector calculates the power thousandth according to the current total installed capacity, the number of operating stations of the inverters, and the received total required power, that is, the total required power in the form of the named value is converted into the total required power in the form of a thousandth, and a calculation formula of the power thousandth is as follows,
Figure BDA0003855470260000071
the total required power is the total required power of the current area, the total installed capacity is the total installed capacity of the current area, the number of running inverters is the number of inverters in normal running states of the current area, the total number of inverters is the total number of inverters of the current area, the total required power issued by the rapid frequency modulation device in the current area is 500kW, the total installed capacity of the current area is 1000kW, the number of running inverters of the current area is 10, the total number of inverters of the current area is 15, the power thousandths of the current area can be calculated and obtained through the power thousandths formula, namely, when the total output power of the photovoltaic power generation system in the current area reaches 750 thousandths of the maximum output power of the current area, the frequency modulation requirement of the photovoltaic power generation system in the current area can be met, the power thousandths sent to the inverters are calculated and then displayed on a operation and maintenance tool, analysis and debugging engineers can conveniently conduct analysis and debugging, and engineering can directly issue the total required power in the form of thousandths to the inverters when the total required power of the frequency modulation device in the data collector is in the form of thousandths.
In an optional embodiment of the application, the data acquisition unit of the application designs multiple algorithms in an adjustment instruction forwarding link, so that the total demand power of the named value form and the total demand power of the thousands of forms of the rapid frequency modulation device can be received, and the total demand power of the named value form and the total demand power of the thousands of forms of the inverter can also be sent to the following, so that the total demand power of the rapid frequency modulation device is converted into the form which the inverter can receive, and the rapid frequency modulation device is suitable for the inverters of different manufacturers.
In an optional embodiment of the present application, before controlling the inverter to output the required power to adjust the frequency of the photovoltaic power generation system, the method further includes: and sending the power dial ratio to the inverter in a serial communication mode. In this embodiment, after the data collector in the current area calculates the power thousandths that need to be issued to the inverters, the data collector in the current area immediately assembles the power thousandths into broadcast messages according to the modbus communication protocol, and sends the broadcast messages to each inverter in the current area through the serial port 485 bus or the power carrier equipment, and each inverter in the current area rapidly performs power response after receiving the broadcast messages, that is, each inverter in the current area rapidly outputs required power according to the adjustment instruction, so as to meet the requirement of rapid frequency modulation of the photovoltaic power generation system.
In an optional embodiment of the present application, after controlling the inverter to output the required power to adjust the frequency of the photovoltaic power generation system, the method further includes: acquiring the operation state and the output power of the inverter; assembling the operating state and the output power of the inverter into a second goose message, wherein the second goose message is in the 61850 model file format; and sending the second goose message to the fast frequency modulation device. In the embodiment, the data collector in the current zone sends a broadcast message to each inverter according to a modbus communication protocol and then quickly returns to a polling mode, inquires the operating state and the real-time power of each inverter in the current zone, calculates the real-time total output power of the current zone and displays the real-time total output power on an operation and maintenance tool, assembles the operating state and the real-time power of each inverter in the current zone, which are acquired by the modbus polling, into a second goose message in a 61850 model file format through a switch and forwards the second goose message to the fast frequency modulation device, so that the fast frequency modulation device can acquire the operating state and the real-time output power of each inverter in the current zone in real time, and determines whether the operating state and the real-time output power of each inverter in the current zone meet the frequency adjustment requirement of the current zone.
In an optional embodiment of the application, the data collector of the application can also be connected to an AGVC system of a photovoltaic power generation system, and the data collector of the application is matched with the AGVC system to adjust the power of the photovoltaic power generation system.
The embodiment of the present application further provides a device for adjusting the frequency of a photovoltaic power generation system, and it should be noted that the device for adjusting the frequency of a photovoltaic power generation system according to the embodiment of the present application can be used to execute the method for adjusting the frequency of a photovoltaic power generation system according to the embodiment of the present application. The device for adjusting the frequency of the photovoltaic power generation system provided by the embodiment of the application is introduced below.
Fig. 3 is a schematic diagram of a device for adjusting the frequency of a photovoltaic power generation system according to an embodiment of the present application. As shown in fig. 3, the apparatus includes:
an obtaining unit 10, configured to obtain total required power, the number of the inverters in a normal operation state, and a total installed capacity, where the total required power is output power of the photovoltaic power generation system that meets a frequency adjustment requirement of the photovoltaic power generation system;
a calculating unit 20, configured to calculate, when the total required power is a famous value, a power thousandth ratio according to the total required power, the number of the inverters in a normal operation state, and the total installed capacity, where the power thousandth ratio is a thousandth form of a ratio of the total required power to the maximum output power of the photovoltaic power generation system;
and a control unit 30 for controlling the inverter to output a required power to adjust the frequency of the photovoltaic power generation system, wherein the required power is a product of a rated power of the inverter and the power per mill ratio.
In the device for adjusting the frequency of the photovoltaic power generation system, an obtaining unit obtains total required power, the number of the inverters in a normal operation state and total installed capacity, wherein the total required power is output power of the photovoltaic power generation system which meets the frequency adjustment requirement of the photovoltaic power generation system; the calculating unit is used for calculating a power thousandth ratio according to the total required power, the number of the inverters in a normal operation state and the total installed capacity under the condition that the total required power is a famous value, wherein the power thousandth ratio is a thousandth form of a ratio of the total required power to the maximum output power of the photovoltaic power generation system; and the control unit is used for controlling the inverter to output required power so as to adjust the frequency of the photovoltaic power generation system, wherein the required power is the product of the rated power of the inverter and the power thousandth ratio. The device converts the famous value of the total required power into the power thousandth ratio to obtain the ratio of the output power of the photovoltaic power generation system meeting the frequency regulation requirement of the photovoltaic power generation system to the maximum output power of the photovoltaic power generation system, then adjusts the output power of each inverter according to the power thousandth ratio, wherein the output power of each inverter is the product of the power thousandth ratio and the rated power of each inverter, and ensures that the actual output power of the whole photovoltaic power generation system is the total required power so as to achieve the purpose of adjusting the frequency of the photovoltaic power generation system. The device solves the problem that the data acquisition unit cannot convert the form of the power transmitted by the rapid frequency modulation device into the form of the power which can be received by the inverter when the frequency of the photovoltaic power generation system is adjusted in the prior art.
In an optional embodiment of the present application, as shown in fig. 2, in the whole photovoltaic power generation system, a goose protocol of a iec61850 communication protocol is used to access the fast frequency modulation device, an adjustment instruction of the fast frequency modulation device is forwarded to the data acquisition device through the switch in the form of a goose message, the data acquisition device performs fast response calculation processing, the data acquisition device calculates output power of inverters in the photovoltaic power generation system according to the adjustment instruction, and issues the calculated output power of each inverter in the form of a modbus broadcast message through a serial port 485 bus or a power carrier device, each inverter receives the instruction and then performs fast response, and the fast frequency modulation device can receive line frequency acquired by the data acquisition device forwarded by the switch in real time to calculate a frequency adjustment curve.
In an optional embodiment of the application, a 61850 model file is generated according to telemetering and remote signaling data configured by an operation and maintenance tool, a source mac address and a destination mac address are configured in the 61850 model file, some parameter settings related to goose messages such as APPID, GOID, GOCBRef, dataSet, confRev and the like are configured, and after the 61850 model file is configured, the 61850 model file is taught to a device which needs to subscribe the goose messages, so that early preparation is made for goose communication.
In an optional embodiment of the application, the device for adjusting the frequency of the photovoltaic power generation system further includes a receiving unit and an analyzing unit, where the receiving unit is configured to receive a first goose message sent by the fast frequency modulation device, the first goose message includes the total required power, and a format of the first goose message is a 61850 model file format; the analysis unit is configured to analyze the first goose packet to obtain the total required power. In this embodiment, the fast frequency modulation device determines output power of a photovoltaic power generation system meeting a frequency regulation requirement of the photovoltaic power generation system according to a power-frequency characteristic curve of the photovoltaic power generation system, that is, determines total required power, then, the fast frequency modulation device assembles the total required power into a first goose message in a 61850 model file format, and forwards the first goose message to the data collector through the switch, the data collector extracts subscribed data, that is, the total required power, in the first goose message according to the model file format of the model 61850 issued by the fast frequency modulation device, that is, the fast frequency modulation device issues an adjustment instruction, the data collector processes the adjustment instruction at the first time after receiving the adjustment instruction, and displays an unprocessed instruction value on an operation and maintenance tool, so that a site debugging engineer performs a peer-to-peer operation, compared with a case that most of data collectors in the prior art adopt a iec communication protocol to access the fast frequency modulation device, the fast frequency modulation device of the application forwards the total required power to the data collector in a goose message form through the switch, that the data collector adopts a 3262 zxft Communication protocol to access the fast frequency modulation device, and the fast frequency modulation device of the photovoltaic power generation system meet the requirement of the fast frequency modulation device.
It should be noted that, when the communication between the fast frequency modulation device and the data collector is realized according to the goose transmission protocol, the data collector needs to parse a large number of first goose messages in the 61850 model file format, the data collector of the present application uses a fast parsing method in the linux system, the parsing method analyzes the first goose messages in the whole 61850 model file format at one time when analyzing the first goose messages in the 61850 model file format, and forms a corresponding tree structure in the memory, so that the content of the first goose messages in the whole 61850 model file format is arbitrarily accessed and parsed through a specific access interface, the parsing method adopts a lightweight parsing process, the correctness of the XML file is verified by using the DTD file, the parsing can be performed as long as the format of the XML file is correct, and the parsing method has a small code volume, is particularly suitable for fast parsing the goose messages in the 61850 model file format, has excellent parsing capability and portability, and can play a strong role in parsing the goose messages in the 61850 model file format.
In an optional embodiment of the present application, the receiving unit includes a receiving module and a determining module, where the receiving module is configured to receive an original goose packet sent by the fast frequency modulation apparatus, where the original goose packet is a packet transmitted by using a physical layer protocol or a data link layer protocol; the determining module is configured to determine that the original goose packet is the first goose packet when the original goose packet is a packet transmitted by using the physical layer protocol. In this embodiment, according to the standard specification of a goose transmission protocol, the application uses a physical layer transmission fast frequency modulation device to send a first goose message to a data collector, the data collector uses a network packet capturing tool based on a linux system to innovatively use a network packet capturing interface, and uses a network packet capturing interface and a BPF filter to quickly receive the first goose message from a physical layer, specifically, the network packet capturing interface collects an original goose message from a network device, the original goose message may be from a data link layer or a physical layer, then the data collector copies the received original goose message to the BPF filter, a filtering rule of the BPF filter is to only retain the original goose message from the physical layer, the BPF filter judges whether the original goose message is from the physical layer to determine whether to receive the original goose message, in the case that the original goose message is determined to be from the physical layer, the original goose message is determined to be the first goose message, the BPF filter puts the first goose message to an application layer of the first goose application layer, and the application program of the first goose message is determined to be a fast transmission data packet, and the first goose message is not transmitted to the fast frequency modulation data collector in the case that the original goose message is a good transmission data is not capable of being transferred to the fast transmission device.
In an optional embodiment of the present application, the device for adjusting the frequency of the photovoltaic power generation system further includes a first obtaining unit and a determining unit, where the first obtaining unit is configured to obtain operation states of all the inverters, and the operation states of the inverters include the normal operation state and the fault state; the determination unit is configured to determine the number of the inverters in the normal operation state according to the operation states of all the inverters. In the embodiment, the photovoltaic power generation system is divided into a plurality of areas, the areas are divided according to the planning construction of the photovoltaic power generation system, one data collector collects data of one area, the data collector in the current area collects the operation state of each inverter in the current area and various power generation data parameter information in real time, then, the operation state of each inverter in the current area is calculated, the operation number of the inverters in the current area of the photovoltaic power generation system is calculated, namely, the number of the inverters in the normal operation state in the current area of the photovoltaic power generation system is determined, then, the number of the inverters in the normal operation state is stored in a database, the real-time output power of each inverter in the current area is calculated in real time, the real-time total output power of the current area of the photovoltaic power generation system is calculated, the installed capacity of the current area, the current operation number of the inverters in the current area and the real-time total output power of the current area are displayed on an operation and maintenance tool, and debugging engineers can conveniently conduct on-site investigation and point alignment.
In an optional embodiment of the application, the device for adjusting the frequency of the photovoltaic power generation system further includes a trigger unit, and the trigger unit is configured to trigger an internal interrupt instruction to stop an ongoing operation inside the data collector. In the embodiment, after a data acquisition unit receives a first goose message of a fast frequency modulation device and extracts total required power in the first goose message, namely a control instruction of the fast frequency modulation device is received by the data acquisition unit, a protocol command forwarding unit arranged in the data acquisition unit triggers an internal interrupt instruction to control other ongoing work interrupts in the data acquisition unit, the number of inverters in a normal operation state, the total number of the inverters and the total installed capacity are immediately acquired from a database, a power thousandth ratio needing to be issued to the inverters is calculated according to the total required power, the number of the inverters in a normal operation state, the total number of the inverters and the total installed capacity, a forwarding value forwarded to the inverters is calculated in real time, and then the forwarding value is assembled into a message according to a modbus communication protocol and forwarded to the inverters.
In an optional embodiment of the present application, the calculating unit includes a first calculating module, a second calculating module, a third calculating module and a fourth calculating module, and the first calculating module is configured to calculate the number of the inverters in the normal operating stateObtaining the operation proportion of the ratio of the total number of the inverters to the total number of the inverters; the second calculating module is used for calculating the product of the total installed capacity and the operation proportion to obtain the maximum output power; the third calculating module is used for calculating the ratio of the total required power to the maximum output power to obtain a power ratio; the fourth calculation module is configured to calculate a product of the power ratio and 1000, and obtain the power thousandth ratio. In this embodiment, most of inverters applied in the current photovoltaic power generation system can only receive total required power in the form of a thousandth, that is, receive a power instruction in the form of a thousandth, when the total required power issued to the data collector by the fast frequency modulation device is in the form of a named value, the data collector calculates the power thousandth according to the current total installed capacity, the number of operating stations of the inverters, and the received total required power, that is, the total required power in the form of the named value is converted into the total required power in the form of a thousandth, and a calculation formula of the power thousandth is as follows,
Figure BDA0003855470260000111
the total required power is the total required power of the current area, the total installed capacity is the total installed capacity of the current area, the number of running inverters is the number of inverters in normal running states of the current area, the total number of inverters is the total number of inverters of the current area, the total required power issued by the rapid frequency modulation device in the current area is 500kW, the total installed capacity of the current area is 1000kW, the number of running inverters of the current area is 10, the total number of inverters of the current area is 15, the power thousandths of the current area can be calculated and obtained through the power thousandths formula, namely, when the total output power of the photovoltaic power generation system in the current area reaches 750 thousandths of the maximum output power of the current area, the frequency modulation requirement of the photovoltaic power generation system in the current area can be met, the power thousandths sent to the inverters are calculated and then displayed on a operation and maintenance tool, analysis and debugging engineers can conveniently conduct analysis and debugging, and engineering can directly issue the total required power in the form of thousandths to the inverters when the total required power of the frequency modulation device in the data collector is in the form of thousandths.
In an optional embodiment of the present application, in consideration that the form of the total required power that can be issued to the data collector by the fast frequency modulation devices of different manufacturers may be a named value form or a thousandth form, and the form of the total required power that can be received by the inverters of different manufacturers may be a named value form or a thousandth form, the data collector of the present application designs a plurality of algorithms in an adjustment instruction forwarding link, and can receive the total required power in the named value form and the total required power in the thousandth form of the fast frequency modulation devices, and can also transmit the total required power in the named value form and the total required power in the thousandth form to the inverters as follows, so that the total required power issued by the fast frequency modulation devices is converted into a form that can be received by the inverters to adapt to the inverters of different manufacturers.
In an optional embodiment of the application, the adjusting device for the frequency of the photovoltaic power generation system further includes a first sending unit, and the first sending unit is configured to send the power thousandth ratio to the inverter in a serial communication manner. After the data collector in the current area calculates the power thousandths which need to be issued to the inverters, the data collector in the current area immediately assembles the power thousandths into broadcast messages according to a modbus communication protocol, the broadcast messages are sent to each inverter in the current area through a serial port 485 bus or power carrier equipment, and after each inverter in the current area receives the broadcast messages, power response is rapidly carried out, namely, each inverter in the current area rapidly outputs required power according to an adjusting instruction, so that the requirement of rapid frequency modulation of the photovoltaic power generation system is met.
In an optional embodiment of the present application, the device for adjusting the frequency of the photovoltaic power generation system further includes a second obtaining unit, an assembling unit, and a second sending unit, where the second obtaining unit is configured to obtain the operating state and the output power of the inverter; the assembling unit is configured to assemble the operating state and the output power of the inverter into a second goose message, where the second goose message is in the 61850 model file format; the second sending unit is configured to send the second goose message to the fast frequency modulation apparatus. In the embodiment, the data collector in the current zone sends a broadcast message to each inverter according to a modbus communication protocol and then quickly returns to a polling mode, inquires the operating state and the real-time power of each inverter in the current zone, calculates the real-time total output power of the current zone and displays the real-time total output power on an operation and maintenance tool, assembles the operating state and the real-time power of each inverter in the current zone, which are acquired by the modbus polling, into a second goose message in a 61850 model file format through a switch and forwards the second goose message to the fast frequency modulation device, so that the fast frequency modulation device can acquire the operating state and the real-time output power of each inverter in the current zone in real time, and determines whether the operating state and the real-time output power of each inverter in the current zone meet the frequency adjustment requirement of the current zone.
In an optional embodiment of the application, the data collector of the application can also be connected to an AGVC system of a photovoltaic power generation system, and the data collector of the application is matched with the AGVC system to adjust the power of the photovoltaic power generation system.
In an optional embodiment of the application, in a process of performing data communication and command transmission among a data collector, a fast frequency modulation device and a plurality of group string inverters based on iec, iec and a modbus communication protocol in a photovoltaic power generation system in the prior art, a large number of calculation processes are generally performed in a process of forwarding a message, and a time loss of the whole photovoltaic power generation system in regulation and control speed is affected if the calculation process is too long.
The device for adjusting the frequency of the photovoltaic power generation system comprises a processor and a memory, wherein the acquisition unit, the calculation unit, the control unit and the like are stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions.
The processor comprises a kernel, and the kernel calls the corresponding program unit from the memory. The kernel can be set to be one or more than one, and the problem that a data acquisition unit cannot convert the form of power transmitted by the rapid frequency modulation device into the form of power which can be received by the inverter when the frequency of the photovoltaic power generation system is adjusted in the prior art is solved by adjusting the kernel parameters.
The memory may include volatile memory in a computer readable medium, random Access Memory (RAM) and/or nonvolatile memory such as Read Only Memory (ROM) or flash memory (flash RAM), and the memory includes at least one memory chip.
The embodiment of the application provides a storage medium, wherein a program is stored on the storage medium, and the program is executed by a processor to realize the frequency adjusting method of the photovoltaic power generation system.
The embodiment of the application provides a processor, wherein the processor is used for running a program, and when the program runs, the method for adjusting the frequency of the photovoltaic power generation system is executed.
The embodiment of the application provides a photovoltaic power generation system frequency's governing system, includes: a photovoltaic power generation system, one or more processors, a memory, and one or more programs, wherein the photovoltaic power generation system comprises a data collector, a fast frequency modulation device, and an inverter, the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs include instructions for performing any one of the methods described above, and the processors execute the programs to implement at least the following steps:
step S101, acquiring total required power, the number of the inverters in a normal operation state and total installed capacity, wherein the total required power is output power of the photovoltaic power generation system meeting the frequency regulation requirement of the photovoltaic power generation system;
step S102, under the condition that the total required power is a famous value, calculating to obtain a power thousandth ratio according to the total required power, the number of the inverters in a normal operation state and the total installed capacity, wherein the power thousandth ratio is in a thousandth form of the ratio of the total required power to the maximum output power of the photovoltaic power generation system;
and step S103, controlling the inverter to output required power so as to adjust the frequency of the photovoltaic power generation system, wherein the required power is the product of the rated power of the inverter and the power thousandth ratio.
The present application further provides a computer program product adapted to perform a program of initializing at least the following method steps when executed on a data processing device:
step S101, acquiring total required power, the number of the inverters in a normal operation state and total installed capacity, wherein the total required power is output power of the photovoltaic power generation system meeting the frequency regulation requirement of the photovoltaic power generation system;
step S102, under the condition that the total required power is a famous value, calculating to obtain a power thousandth ratio according to the total required power, the number of the inverters in a normal operation state and the total installed capacity, wherein the power thousandth ratio is in a thousandth form of the ratio of the total required power to the maximum output power of the photovoltaic power generation system;
and step S103, controlling the inverter to output required power so as to adjust the frequency of the photovoltaic power generation system, wherein the required power is the product of the rated power of the inverter and the power thousandth ratio.
In the above embodiments of the present application, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technical content can be implemented in other manners. The above-described embodiments of the apparatus are merely illustrative, and for example, the above-described division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit may be stored in a computer-readable storage medium if it is implemented in the form of a software functional unit and sold or used as a separate product. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
From the above description, it can be seen that the above-described embodiments of the present application achieve the following technical effects:
1) According to the method for adjusting the frequency of the photovoltaic power generation system, firstly, total required power, the number of the inverters in a normal operation state and total installed capacity are obtained, wherein the total required power is output power of the photovoltaic power generation system meeting the frequency adjusting requirement of the photovoltaic power generation system; then, under the condition that the total required power is a famous value, calculating to obtain a power thousandth ratio according to the total required power, the number of the inverters in a normal operation state and the total installed capacity, wherein the power thousandth ratio is a thousandth form of a ratio of the total required power to the maximum output power of the photovoltaic power generation system; and finally, controlling the inverter to output required power so as to adjust the frequency of the photovoltaic power generation system, wherein the required power is the product of the rated power of the inverter and the power thousandth ratio. According to the method, the ratio of the output power of the photovoltaic power generation system meeting the frequency regulation requirement of the photovoltaic power generation system to the maximum output power of the photovoltaic power generation system is obtained by converting the famous value of the total required power into the power thousandths, then, the output power of each inverter is regulated according to the power thousandths, the output power of each inverter is the product of the power thousandths and the rated power of the inverter, the actual output power of the whole photovoltaic power generation system is ensured to be the total required power, and the purpose of regulating the frequency of the photovoltaic power generation system is achieved. The method solves the problem that the data acquisition unit cannot convert the form of the power transmitted by the rapid frequency modulation device into the form of the power which can be received by the inverter when the frequency of the photovoltaic power generation system is adjusted in the prior art.
2) In the frequency adjusting device for the photovoltaic power generation system, an obtaining unit obtains total required power, the number of the inverters in a normal operation state and total installed capacity, wherein the total required power is output power of the photovoltaic power generation system meeting the frequency adjusting requirement of the photovoltaic power generation system; the calculating unit is used for calculating a power thousandth ratio according to the total required power, the number of the inverters in a normal operation state and the total installed capacity under the condition that the total required power is a famous value, wherein the power thousandth ratio is a thousandth form of a ratio of the total required power to the maximum output power of the photovoltaic power generation system; and the control unit is used for controlling the inverter to output required power so as to adjust the frequency of the photovoltaic power generation system, wherein the required power is the product of the rated power of the inverter and the power thousandth ratio. The device converts the famous value of the total required power into the power thousandth ratio to obtain the ratio of the output power of the photovoltaic power generation system meeting the frequency regulation requirement of the photovoltaic power generation system to the maximum output power of the photovoltaic power generation system, then adjusts the output power of each inverter according to the power thousandth ratio, wherein the output power of each inverter is the product of the power thousandth ratio and the rated power of each inverter, and ensures that the actual output power of the whole photovoltaic power generation system is the total required power so as to achieve the purpose of adjusting the frequency of the photovoltaic power generation system. The device solves the problem that the data acquisition unit cannot convert the form of the power transmitted by the rapid frequency modulation device into the form of the power which can be received by the inverter when the frequency of the photovoltaic power generation system is adjusted in the prior art.
3) The utility model provides a governing system of photovoltaic power generation system frequency includes: the system comprises a photovoltaic power generation system, one or more processors, a memory, and one or more programs, wherein the photovoltaic power generation system comprises a data collector, a fast frequency modulation device, and an inverter, the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs comprise instructions for performing any of the methods described above. The system obtains the ratio of the output power of the photovoltaic power generation system meeting the frequency regulation requirement of the photovoltaic power generation system to the maximum output power of the photovoltaic power generation system by converting the famous value of the total required power into the power thousandth ratio, then adjusts the output power of each inverter according to the power thousandth ratio, wherein the output power of each inverter is the product of the power thousandth ratio and the rated power of each inverter, and ensures that the actual output power of the whole photovoltaic power generation system is the total required power so as to achieve the purpose of adjusting the frequency of the photovoltaic power generation system. The system solves the problem that the data acquisition unit cannot convert the form of the power transmitted by the rapid frequency modulation device into the form of the power which can be received by the inverter when the frequency of the photovoltaic power generation system is adjusted in the prior art.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (12)

1. A method for adjusting the frequency of a photovoltaic power generation system is characterized in that the photovoltaic power generation system comprises a data acquisition unit, a fast frequency modulation device and an inverter, the method is applied to the data acquisition unit, the fast frequency modulation device and the inverter are both in communication connection with the data acquisition unit, and the method comprises the following steps:
acquiring total required power, the number of the inverters in a normal operation state and total installed capacity, wherein the total required power is output power of the photovoltaic power generation system meeting the frequency regulation requirement of the photovoltaic power generation system;
under the condition that the total required power is a named value, calculating to obtain a power thousandth ratio according to the total required power, the number of the inverters in a normal operation state and the total installed capacity, wherein the power thousandth ratio is in a thousandth form of the ratio of the total required power to the maximum output power of the photovoltaic power generation system;
and controlling the inverter to output required power so as to adjust the frequency of the photovoltaic power generation system, wherein the required power is the product of the rated power of the inverter and the power thousandth ratio.
2. The method of regulating according to claim 1, wherein before obtaining total required power, the number of inverters in normal operation state, and total installed capacity, the method further comprises:
receiving a first goose message sent by the fast frequency modulation device, wherein the first goose message comprises the total required power, and the format of the first goose message is 61850 model file format;
and analyzing the first goose message to obtain the total required power.
3. The method according to claim 2, wherein receiving the first goose message sent by the fast frequency modulation apparatus comprises:
receiving an original goose message sent by the rapid frequency modulation device, wherein the original goose message is a message transmitted by adopting a physical layer protocol or a data link layer protocol;
and determining that the original goose message is the first goose message under the condition that the original goose message is the message transmitted by adopting the physical layer protocol.
4. The method of regulating according to claim 1, wherein before obtaining total required power, the number of inverters in normal operation state, and total installed capacity, the method further comprises:
acquiring the running states of all the inverters, wherein the running states of the inverters comprise the normal running state and the fault state;
determining the number of the inverters in the normal operation state according to the operation states of all the inverters.
5. The regulation method according to claim 1, wherein before calculating a power thousandth ratio from the total required power, the number of inverters in a normal operation state, and the total installed capacity, the method further comprises:
triggering an internal interrupt instruction to stop the internal ongoing work of the data collector.
6. The regulation method according to claim 1, wherein calculating a power ratio according to the total required power, the number of the inverters in a normal operation state, and the total installed capacity includes:
calculating the ratio of the number of the inverters in the normal operation state to the total number of the inverters to obtain an operation proportion;
calculating the product of the total installed capacity and the operation proportion to obtain the maximum output power;
calculating the ratio of the total required power to the maximum output power to obtain a power ratio;
and calculating the product of the power proportion and 1000 to obtain the power thousandth ratio.
7. The method of conditioning of claim 1, wherein prior to controlling the inverter to output a demanded power to adjust the frequency of the photovoltaic power generation system, the method further comprises:
and sending the power thousandths to the inverter in a serial communication mode.
8. The method of conditioning of claim 2, wherein after controlling the inverter to output a demanded power to adjust the frequency of the photovoltaic power generation system, the method further comprises:
acquiring the running state and output power of the inverter;
assembling the operating state and the output power of the inverter into a second goose message, wherein the second goose message is in the 61850 model file format;
and sending the second goose message to the fast frequency modulation device.
9. The utility model provides an adjusting device of photovoltaic power generation system frequency, its characterized in that, photovoltaic power generation system includes data collection station, quick frequency modulation device and dc-to-ac converter, adjusting device is applied to data collection station, quick frequency modulation device with the dc-to-ac converter all with data collection station communication connection, the device includes:
the acquiring unit is used for acquiring total required power, the number of the inverters in a normal operation state and total installed capacity, wherein the total required power is output power of the photovoltaic power generation system meeting the frequency regulation requirement of the photovoltaic power generation system;
the calculating unit is used for calculating a power thousandth ratio according to the total required power, the number of the inverters in a normal operation state and the total installed capacity under the condition that the total required power is a named value, wherein the power thousandth ratio is a thousandth form of a ratio of the total required power to the maximum output power of the photovoltaic power generation system;
and the control unit is used for controlling the inverter to output required power so as to adjust the frequency of the photovoltaic power generation system, wherein the required power is the product of the rated power of the inverter and the power thousandth ratio.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium comprises a stored program, wherein the program performs the method of any one of claims 1 to 8.
11. A processor, characterized in that the processor is configured to run a program, wherein the program when running performs the method of any of claims 1 to 8.
12. A system for regulating the frequency of a photovoltaic power generation system, comprising: a photovoltaic power generation system comprising a data collector, a fast frequency modulation device, and an inverter, one or more processors, memory, and one or more programs stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising instructions for performing the method of any of claims 1-8.
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