CN111030592A - Photovoltaic group string loss warning method and device - Google Patents
Photovoltaic group string loss warning method and device Download PDFInfo
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Abstract
The application provides a photovoltaic string loss warning method and a device, the method identifies the string access state of a photovoltaic inverter after judging that the photovoltaic inverter meets the triggering condition of string access state identification, judges whether the photovoltaic inverter meets the triggering condition of string loss warning or not on the basis of finishing the identification of the string access state, if so, identifies the loss of the string of the photovoltaic inverter according to the acquired electrical performance parameters of the string and the string access state of the photovoltaic inverter by combining an inverter string loss identification algorithm, and if a single string or a plurality of strings are lost, the string loss warning is carried out, thereby, the method can rapidly and low-cost solve the problem of the loss warning of the photovoltaic string of a photovoltaic power station, has simple processing process and accurate result, improves the fault solution efficiency of the photovoltaic power station, and improves the operation and maintenance capacity of the photovoltaic power station, and for the scene of accessing a single string or multiple strings, the loss of the string group can be accurately and quickly alarmed, and the operation and maintenance of the client are simplified.
Description
Technical Field
The application relates to the technical field of photovoltaic power generation, in particular to a photovoltaic string loss warning method and device.
Background
With the rapid development of economy, the contradiction between economic growth and resource consumption and environmental pollution is more and more prominent, the sustainable utilization of natural resources becomes the key of the sustainable development of the economic society, and economic reproduction increasingly depends on the optimization and reproduction of natural ecological environment. The photovoltaic power generation technology unifies environmental protection, ecological optimization, efficiency improvement and economy development, improves the high efficiency of resource allocation, and promotes sustainable supply of resources. The photovoltaic power generation is a power generation system for converting solar energy into electric energy by utilizing a photovoltaic module, and comprises a photovoltaic group string, a storage battery, a controller and a photovoltaic inverter. The photovoltaic group string comprises a plurality of photovoltaic modules which are connected in series and/or in parallel, and the photovoltaic modules are photovoltaic cell combination devices which can independently provide direct current output and are minimally inseparable.
With the large-scale application of photovoltaic power generation technology, application scenes are increasingly diversified. Under most conditions, the photovoltaic power station is far away in position, scattered in stations, low in manual operation and maintenance efficiency, or unattended in stations, and the like, so that how to rapidly and accurately alarm whether the photovoltaic string is lost or not is particularly important. In the prior art, more than two groups of I-V data of a photovoltaic string are obtained, then a preset string physical model is adopted for fitting processing to obtain characteristic parameters of a battery string, and then the characteristic parameters are compared with a standard characteristic string to judge whether the string is lost or not.
However, the above-mentioned techniques need to obtain a large amount of I-V data, and can only perform fitting of a large amount of data offline, and finally determine whether the photovoltaic string is lost by comparing with the characteristic parameters, so that the calculation process is complicated.
Disclosure of Invention
The application provides a photovoltaic string loss warning method and device, the problem of photovoltaic power station photovoltaic string loss warning is solved, the processing process is simple, the processing result is accurate, and the photovoltaic power station fault solving efficiency is improved.
In a first aspect, an embodiment of the present application provides a method for warning of loss of a pv string, where the method may be performed by a pv inverter, and the method includes the following steps: firstly, whether a photovoltaic inverter meets a triggering condition for identifying a string access state is judged, if so, the string access state of the photovoltaic inverter is identified according to string electrical performance parameters of the photovoltaic inverter accessed string based on a string access state identification algorithm, wherein the string electrical performance parameters can include string current, string voltage and string power, and can also include other electrical performance parameters. The group string access state may include an unaccessed group string, an accessed single group string, an accessed two-string group string, an accessed three-string group string, and so on. Secondly, on the basis of completing identification of a string access state of the photovoltaic inverter, judging whether the photovoltaic inverter meets a triggering condition for string loss alarm, if so, acquiring string electrical performance parameters of the photovoltaic inverter, identifying the loss of the string of the photovoltaic inverter by combining an inverter string loss identification algorithm according to the acquired string electrical performance parameters and the string access state of the photovoltaic inverter, and if the identification result is that the photovoltaic inverter loses a single string or loses a plurality of strings, alarming the loss of the string.
The embodiment of the application identifies the string access state of the photovoltaic inverter after judging that the photovoltaic inverter meets the triggering condition of string access state identification, judges whether the photovoltaic inverter meets the triggering condition of string loss alarm or not on the basis of finishing the identification of the string access state of the photovoltaic inverter, if so, identifies the string loss of the photovoltaic inverter according to the acquired string electrical performance parameters and the string access state of the photovoltaic inverter by combining an inverter string loss identification algorithm, and if the photovoltaic inverter loses a single string or loses a plurality of strings, the string loss alarm is carried out, so that the problem of photovoltaic string loss alarm of the photovoltaic power station can be solved quickly and at low cost, the processing process is simple, the processing result is accurate, the failure solution efficiency of the photovoltaic power station is improved, and the operation and maintenance capacity of the photovoltaic power station is improved, and for the scene of accessing a single string or multiple strings, the loss of the string group can be accurately and quickly alarmed, and the operation and maintenance of the client are simplified.
In one possible design, the triggering condition for identifying the group string access state includes that a parameter of an environment where the photovoltaic inverter is located satisfies a first preset environment condition, and that a group string electrical performance parameter of the photovoltaic inverter satisfies at least one of the first preset group string parameter conditions.
The first preset environmental condition and the first preset group parameter condition may be set according to an actual situation, for example, the first preset environmental condition is determined according to a fluctuation situation of the environmental parameter, and the comparison in the embodiment of the present application is not particularly limited.
The photovoltaic inverter recognizes the string access state of the photovoltaic inverter when the triggering condition of the string access state recognition is met, so that the influence of external factors such as environmental parameter fluctuation on the recognition result is avoided, the accuracy of the string access state recognition result of the photovoltaic inverter is guaranteed, the recognition of the string access state of the photovoltaic inverter can be realized without external triggering, the processing process is simple, and the operation and maintenance of customers are simplified.
In one possible design, the triggering condition for the group string loss alarm includes that a parameter of an environment where the photovoltaic inverter is located satisfies a second preset environment condition, and that a group string electrical performance parameter of the photovoltaic inverter satisfies at least one of the second preset group string parameter conditions.
Similarly, the second preset environmental condition and the second preset group string parameter condition may be set according to an actual situation, and the comparison in the embodiment of the present application is not particularly limited.
The photovoltaic inverter recognizes the group string loss of the photovoltaic inverter when the triggering condition of the group string loss alarm is met, so that the influence of external factors, such as environmental parameter fluctuation, on the recognition result is avoided, the accuracy of the group string access state recognition result of the photovoltaic inverter is guaranteed, the group string loss can be recognized without external triggering, the processing process is simple, and the operation and maintenance of customers are simplified.
One possible design, before performing the group string loss alarm, further includes:
and based on the group string electrical performance parameters of all the group strings, carrying out group string loss judgment on the photovoltaic inverter under the condition of a preset judgment threshold value, wherein the preset judgment threshold value condition comprises a logical relation or a proportional relation between the group strings, or the absolute value, the relative ratio, the time dimension or the space dimension of the group string electrical performance parameters meet the preset condition.
Here, for the pv inverter connected to the string, there is a scene where the string is lost, and on the basis of identifying the string loss of the pv inverter according to the collected string electrical performance parameters and the string connection state of the pv inverter by combining the inverter string loss identification algorithm, the current/voltage/power parameters of all strings are selected as references, under the condition of a certain decision threshold: the logic relation or the proportional relation between the group strings, or the absolute value/the relative ratio/the time dimension or the space dimension (current/voltage/power) meets the preset condition, and further, the judgment of partial or full loss of the group strings is realized. The photovoltaic inverter is combined with the two steps of operation to judge whether the photovoltaic inverter loses the string, accuracy of a judgment result is further guaranteed, and the method is suitable for practical application.
One possible design, the collecting of the string electrical performance parameters of the photovoltaic inverter includes:
and collecting the electrical performance parameters of the photovoltaic group strings connected with the photovoltaic inverter according to a preset sampling frequency.
Illustratively, the photovoltaic inverter acquires electrical performance parameters such as current/voltage/power of a string connected to the photovoltaic inverter according to a certain sampling frequency. The sampling frequency may be set according to actual conditions, and the comparison in the embodiments of the present application is not particularly limited.
In a second aspect, an embodiment of the present application provides a photovoltaic string loss warning device, where the device includes:
the trigger judgment module for group string access state identification is used for judging whether the photovoltaic inverter meets the trigger condition of group string access state identification;
a string access state identification module, configured to identify a string access state of the pv inverter according to a string electrical performance parameter of a string accessed by the pv inverter based on a string access state identification algorithm if the pv inverter meets a trigger condition for identifying the string access state, where the string electrical performance parameter includes at least one of a string current, a string voltage, and a string power, and the string access state includes at least one of an accessed single string, an accessed multiple string, and an unaccessed string;
the triggering judgment module for the group string loss alarm is used for judging whether the photovoltaic inverter meets the triggering condition of the group string loss alarm or not on the basis of finishing the identification of the group string access state of the photovoltaic inverter;
a string loss identification module, configured to collect string electrical performance parameters of the photovoltaic inverter if the photovoltaic inverter meets the triggering condition of the string loss alarm, and identify, according to the collected string electrical performance parameters and the string access state of the photovoltaic inverter, a string loss of the photovoltaic inverter in combination with an inverter string loss identification algorithm;
and the string loss warning module is used for performing string loss warning if the identification result indicates that the photovoltaic inverter loses a single string or loses a plurality of strings.
In one possible design, the triggering condition for identifying the group string access state includes that a parameter of an environment where the photovoltaic inverter is located satisfies a first preset environment condition, and that a group string electrical performance parameter of the photovoltaic inverter satisfies at least one of the first preset group string parameter conditions.
In one possible design, the triggering condition for the group string loss alarm includes that a parameter of an environment where the photovoltaic inverter is located satisfies a second preset environment condition, and that a group string electrical performance parameter of the photovoltaic inverter satisfies at least one of the second preset group string parameter conditions.
In one possible design, before performing the group string loss alarm, the group string loss alarm module is further configured to:
and performing string loss judgment on the photovoltaic inverter under a preset judgment threshold condition based on the string electrical performance parameters of all the strings, wherein the preset judgment threshold condition comprises a logical relation or a proportional relation among the strings, or the absolute value, the relative ratio, the time dimension or the space dimension of the string electrical performance parameters meet the preset condition.
A possible design, wherein the string loss identification module collects string electrical performance parameters of the pv inverter, comprising:
and collecting the electrical performance parameters of the photovoltaic group strings connected with the photovoltaic inverter according to a preset sampling frequency.
In a third aspect, the present application provides a computing device comprising a processor and a memory. The memory stores computer instructions; the processor executes the computer instructions stored by the memory to cause the computing device to perform the method provided by the first aspect or the various possible designs of the first aspect, to cause the computing device to deploy the photovoltaic string loss warning apparatus provided by the second aspect or the various possible designs of the second aspect.
In a fourth aspect, the present application provides a computer-readable storage medium having stored therein computer instructions that instruct a computing device to perform the method provided by the first aspect or the various possible designs of the first aspect, or instruct the computing device to deploy the photovoltaic group string loss warning apparatus provided by the second aspect or the various possible designs of the second aspect.
In a fifth aspect, the present application provides a computer program product comprising computer instructions. Optionally, the computer instructions are stored in a computer readable storage medium. The processor of the computing device may read the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions to cause the computing device to perform the method provided by the first aspect or the various possible designs of the first aspect, so that the computing device deploys the photovoltaic string loss warning apparatus provided by the second aspect or the various possible designs of the second aspect.
In a sixth aspect, an embodiment of the present application provides a chip, which includes a memory and a processor, where the memory is used to store computer instructions, and the processor is used to call and execute the computer instructions from the memory, so as to perform the method in the first aspect and any possible implementation manner of the first aspect.
Drawings
Fig. 1 is a schematic view of a photovoltaic power generation system provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of a photovoltaic inverter provided in an embodiment of the present application;
fig. 3 is a schematic flowchart of a method for warning loss of a photovoltaic string according to an embodiment of the present application;
fig. 4 is a schematic flowchart of another photovoltaic string loss warning method according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a photovoltaic string loss warning device provided in the present application;
fig. 6 is a schematic diagram of a basic hardware architecture of a computing device provided in the present application.
Detailed Description
The main implementation principle, the specific implementation mode and the corresponding beneficial effects of the technical scheme of the embodiment of the present application are explained in detail below with reference to the drawings. In the following, the terms "first", "second" are used for descriptive purposes only and are not to be understood as implying or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature, and in the description of embodiments of the application, unless stated otherwise, "plurality" means two or more.
Aiming at the condition that a large amount of I-V data needs to be obtained in the prior art, fitting of a large amount of data can be carried out only offline, and finally whether the photovoltaic string is lost or not is judged by comparing with characteristic parameters, under the condition that the calculation process is relatively complex, the method can be executed by a photovoltaic inverter, after the photovoltaic inverter is judged to meet the triggering condition of string access state identification, the string access state of the photovoltaic inverter is identified, then on the basis of completing the identification of the string access state of the photovoltaic inverter, whether the photovoltaic inverter meets the triggering condition of string loss alarm or not is judged, if so, the string loss of the photovoltaic inverter is identified, and if the identification result is that the photovoltaic inverter loses a single string or loses a plurality of strings, the string loss alarm is carried out, furthermore, the problem of warning that photovoltaic power plant photovoltaic group cluster loses can be fast, low-cost be solved, and processing procedure is simple moreover, and the processing result is accurate, has improved photovoltaic power plant trouble solution efficiency to, having promoted photovoltaic power plant fortune dimension ability, and to the scene of inserting single cluster or many clusters, can accurately, report an emergency and ask for help or increased vigilance that the group cluster loses fast, retrench customer fortune dimension.
An embodiment of the present application provides a schematic diagram of a photovoltaic power generation system, as shown in fig. 1, including: n photovoltaic inverters, a photovoltaic string and a power grid. Each photovoltaic inverter is connected to at least two strings of photovoltaic strings, for example, n strings of photovoltaic strings, and each photovoltaic inverter is connected to the grid.
A photovoltaic inverter is a device that performs an inversion process of converting direct current electrical energy into alternating current electrical energy. The photovoltaic group string comprises a plurality of photovoltaic modules which are connected in series or/and in parallel. The photovoltaic module, also called a solar panel, is a core part in a photovoltaic power generation system, and converts solar energy into electric energy, provides direct current output, and transmits the electric energy to a storage battery for storage, or pushes a load to work. The single solar cell cannot be directly used as a power supply, a plurality of single cells need to be connected in series or/and in parallel, and are tightly packaged into a component, so that the photovoltaic cell combination device is the smallest indivisible photovoltaic cell combination device.
The power grid, also called as a power grid, includes a substation and a power transmission and distribution line of various voltages in a power system, i.e., three units of power transformation, power transmission and power distribution, and is used for transmitting and distributing electric energy and changing voltage.
As shown in fig. 2, the photovoltaic inverter in fig. 1 may be implemented in the structure in fig. 2.
Fig. 2 is a schematic structural diagram of a photovoltaic inverter provided in an embodiment of the present application. Photovoltaic inverter 100 includes a DC-to-DC/DC circuit 101, a DC-to-AC circuit 102, a sensor 103, an analog-to-digital converter 104, a processor 105, and a memory 106.
The functions of the DC/DC circuit 101, the DC/AC circuit 102, the sensor 103, the analog-to-digital converter 104, the processor 105, and the memory 106 may be implemented by an integrated circuit, and the DC-to-DC circuit 101, the DC-to-AC circuit 102, the sensor 103, the analog-to-digital converter 104, the processor 105, and the memory 106 are integrated on a Printed Circuit Board (PCB). The printed circuit board is also called as a printed circuit board, is an important electronic component, is a support body of an electronic component, and is a carrier for electrical connection of the electronic component.
The DC/DC circuit 101 is connected to the string of photovoltaic strings and may be used to control the input voltage of the string of photovoltaic strings.
The DC/AC circuit 102 is connected to a power grid and may be used to convert DC power to AC power for input to the power grid.
And the sensor 103 can be used for acquiring the electrical performance parameters of the photovoltaic string. Here, the electrical property parameter includes at least one of current, voltage, and power.
And the analog-to-digital converter 104 is configured to convert the analog signal of the electrical performance parameter of the photovoltaic string acquired by the sensor 103 into a digital signal, and transmit the digital signal to the processor 105.
A processor 105, configured to process the digital signal transmitted by the analog-to-digital converter 104, specifically, determine whether the pv inverter satisfies a triggering condition for identifying a string access state, if so, identify the string access state of the pv inverter according to a string electrical property parameter of the string accessed by the pv inverter based on a string access state identification algorithm, and determine whether the pv inverter satisfies the triggering condition for warning that the string is lost on the basis of completing the identification of the string access state of the pv inverter, if so, collect the string electrical property parameter of the pv inverter, identify the loss of the string of the pv inverter according to the collected string electrical property parameter and the string access state of the pv inverter in combination with an inverter string loss identification algorithm, and if the identification result is that the pv inverter loses a single string or loses multiple strings, a group string loss alarm is made.
The processor 105 may be a single processor or a combination of multiple processing elements. For example, the processor 105 may be a Central Processing Unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program according to the present disclosure, such as: one or more microprocessors (digital signal processors, DSP for short), or one or more Field Programmable gate arrays (FPGA for short).
In particular implementations, processor 105 may include one or more CPUs, such as CPU0 and CPU1 in fig. 2, as one embodiment.
In a particular implementation, as an example, photovoltaic inverter 100 may include multiple processors, such as processor 105 and processor 107 in fig. 2. Each of these processors may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).
The Memory 106 may be a Read-Only Memory (ROM) or other types of static storage devices that can store static information and instructions, a Random Access Memory (RAM) or other types of dynamic storage devices that can store information and instructions, an Electrically Erasable Programmable Read-Only Memory (EEPROM), a Compact Disc Read-Only Memory (CD-ROM) or other optical Disc storage, optical Disc storage (including Compact Disc, laser Disc, optical Disc, digital versatile Disc, blu-ray Disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such. The memory may be self-contained. The memory may also be integral to the processor. The method can be used for storing the electrical performance parameters corresponding to the string connection state of the photovoltaic inverter.
The memory 106 is used for storing application program codes for executing the scheme of the application, and the processor 105 controls the execution. The processor 105 is used to execute application program code stored in the memory 106.
It should be noted that, in the photovoltaic power generation system shown in fig. 1, each photovoltaic inverter in the n photovoltaic inverters is connected to at least two photovoltaic strings, each photovoltaic inverter can identify a string access state of the connected photovoltaic string, and during the detection process of a loss alarm of the photovoltaic string, a communication bus can be used for communication among the plurality of photovoltaic inverters. The communication bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (enhanced Industry Standard Architecture) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. Such as a 485 bus.
The n photovoltaic inverters can simultaneously identify the string access state of the photovoltaic inverters, and can also simultaneously perform string loss alarm and the like.
In order to better understand the method for warning loss of a photovoltaic string according to the embodiment of the present application, the technical solution of the present application is described below by taking several embodiments as examples, and the same or similar concepts or processes may not be described in detail in some embodiments.
Fig. 3 is a schematic flowchart of a method for warning loss of a pv string according to an embodiment of the present disclosure, where an execution subject of the embodiment may be the pv inverter in fig. 1 or fig. 2. As shown in fig. 3, the method may include the steps of:
s301: and judging whether the photovoltaic inverter meets the triggering condition of the string access state identification.
Here, the triggering condition for identifying the group string connection state includes at least one of that a parameter of an environment in which the photovoltaic inverter is located satisfies a first preset environment condition, and that a group string electrical property parameter of the photovoltaic inverter satisfies a first preset group string parameter condition.
The first preset environmental condition and the first preset group parameter condition may be set according to an actual situation, for example, the first preset environmental condition is determined according to a fluctuation situation of the environmental parameter, and the comparison in the embodiment of the present application is not particularly limited.
The parameters of the environment in which the photovoltaic inverter is located may include irradiation of the environment and the like. The group string electrical property parameters may include a group string current, a group string voltage, and a group string power, and may also include other electrical property parameters, which are not particularly limited in the embodiments of the present application.
The photovoltaic inverter recognizes the string access state of the photovoltaic inverter when the triggering condition of the string access state recognition is met, so that the influence of external factors such as environmental parameter fluctuation on the recognition result is avoided, the accuracy of the string access state recognition result of the photovoltaic inverter is guaranteed, the recognition of the string access state of the photovoltaic inverter can be realized without external triggering, the processing process is simple, and the operation and maintenance of customers are simplified.
In addition, the power station cloud or the local management system (or station control), or the near-end APP, can realize the management to the inverter, namely the power station cloud or the local management system (or station control), or the near-end APP, can carry out information interaction with the inverter. The power station cloud or the local management system (or station control), or the near-end APP can issue a photovoltaic string access state identification instruction, and the photovoltaic string access state identification granularity can be a string of a single or multiple inverters.
S302: and if the photovoltaic inverter meets the triggering condition of the group string access state identification, identifying the group string access state of the photovoltaic inverter according to group string electrical performance parameters of the photovoltaic inverter access group string based on a group string access state identification algorithm, wherein the group string electrical performance parameters comprise at least one of group string current, group string voltage and group string power, and the group string access state comprises at least one of access single-string group string, access multi-string group string and non-access group string.
Here, if the pv inverter satisfies the trigger condition for identifying the string access state, the pv inverter may collect, according to a certain sampling frequency, electrical performance parameters such as current/voltage/power of the string connected to the pv inverter. The sampling frequency may be set according to actual conditions, and the comparison in the embodiments of the present application is not particularly limited.
Further, the photovoltaic inverter completes automatic identification of the access state of the string according to the string access state identification algorithm and the current/voltage/power of the access string: and the identification of the access state of the group string accessed into the N strings is realized by analogy with three strings accessed into the serial group without accessing, one string accessed into and two strings accessed into. Illustratively, the inverter collects and obtains electrical performance parameters such as string current/voltage/power and the like as input, and based on a string access state identification algorithm, the string access state under the inverter is identified in a classified manner, and the access state of the string under the inverter can be presented at a management system (station control), an APP (application), and other terminals.
The group string access state identification algorithm may be set according to actual needs, for example, according to a logical relationship or a proportional relationship between the group strings, an absolute value, a relative ratio, a time dimension, or a space dimension of the electrical performance parameter of the group string is obtained to meet a preset condition, which is not particularly limited in this application.
In addition, if the photovoltaic inverter does not meet the triggering condition of the group string access state identification, the operation is stopped, and a corresponding prompt can be given, for example, the photovoltaic inverter does not meet the triggering condition of the group string access state identification, so that the relevant personnel can process the operation in time.
S303: and on the basis of identifying the string access state of the photovoltaic inverter, judging whether the photovoltaic inverter meets the triggering condition of string loss alarm.
The triggering condition of the group string loss alarm includes that parameters of the environment where the photovoltaic inverter is located meet at least one of second preset environment conditions and group string electrical performance parameters of the photovoltaic inverter meet second preset group string parameter conditions.
Here, both the second preset environmental condition and the second preset group parameter condition may be set according to actual situations, and the embodiment of the present application is not particularly limited.
The photovoltaic inverter recognizes the group string loss of the photovoltaic inverter when the triggering condition of the group string loss alarm is met, so that the influence of external factors, such as environmental parameter fluctuation, on the recognition result is avoided, the accuracy of the group string access state recognition result of the photovoltaic inverter is guaranteed, the group string loss can be recognized without external triggering, the processing process is simple, and the operation and maintenance of customers are simplified.
In addition, as described above, the power station cloud or the local management system (or station control), or the near-end APP, can implement management of the inverter. The power station cloud or a local management system (or station control), or the near-end APP can issue a group string loss identification instruction, and different application requirements of different application scenes are met.
S304: and if the photovoltaic inverter meets the triggering condition of the group string loss alarm, acquiring the group string electrical property parameters of the photovoltaic inverter, and identifying the group string loss of the photovoltaic inverter by combining an inverter group string loss identification algorithm according to the acquired group string electrical property parameters and the group string access state of the photovoltaic inverter.
Wherein, above-mentioned group's string electrical property parameter of gathering above-mentioned photovoltaic inverter includes:
and collecting the electrical performance parameters of the photovoltaic group strings connected with the photovoltaic inverter according to a preset sampling frequency.
Illustratively, the photovoltaic inverter acquires electrical performance parameters such as current/voltage/power of a string connected to the photovoltaic inverter according to a certain sampling frequency. The sampling frequency may be set according to actual conditions, and the comparison in the embodiments of the present application is not particularly limited.
Here, the photovoltaic inverter performs a string loss warning: after the learning of the string access state of the inverter is completed, the inverter collects electric performance data such as current/voltage/power and the like of the string according to a certain sampling frequency, and for a string loss scene, the loss judgment of the string can be quickly completed by combining an inverter string loss identification algorithm based on the string access state of the photovoltaic inverter through key parameters such as the current/voltage/power and the like of the string. On the basis of completing the learning of the access state of the inverter string, the inverter takes the acquired electrical performance parameters such as string current/voltage/power as input, takes the obtained string access state as a judgment basis, and combines an inverter string loss identification algorithm to complete the judgment of the string loss: such as a single string missing from a group string, two strings missing from a group string, or a full loss of a group string. The group string loss alarm can present the loss alarm of the inverter at the terminals of a management system (station control), APP and the like.
The inverter string loss identification algorithm may be set according to actual needs, for example, set according to a logical relationship or a proportional relationship between strings, or a condition that an absolute value, a relative ratio, a time dimension, or a space dimension of an electrical performance parameter of a string satisfies a preset condition, which is not particularly limited in this application.
In addition, if the photovoltaic inverter does not meet the triggering condition of the group string loss alarm, the operation is stopped, and corresponding prompt can be performed, for example, the photovoltaic inverter does not meet the triggering condition of the group string loss alarm, so that related personnel can process the group string loss alarm in time.
S305: and if the identification result is that the photovoltaic inverter loses a single string or loses a plurality of strings, performing string loss alarm.
Here, if above-mentioned photovoltaic inverter is in the group string and loses the state, photovoltaic inverter carries out the group string and loses and reports an emergency and asks for help or increased vigilance, and photovoltaic inverter can send warning message to above-mentioned power station high in the clouds or local management system (or station accuse), perhaps near-end APP, and then, the group string is lost and is reported an emergency and asks for help or increased vigilance that can present losing of inverter at terminals such as management system (station accuse), APP, and like this, power station fortune dimension personnel can lose by above-mentioned group string and report an emergency and ask for help or increased.
In the embodiment of the application, after the photovoltaic inverter is judged to meet the triggering condition of the string access state identification, the string access state of the photovoltaic inverter is identified, whether the photovoltaic inverter meets the triggering condition of the string loss alarm is judged on the basis of finishing the identification of the string access state of the photovoltaic inverter, if the string access state of the photovoltaic inverter is met, the string loss of the photovoltaic inverter is identified according to the collected string electrical performance parameters and the string access state of the photovoltaic inverter by combining an inverter string loss identification algorithm, and if the photovoltaic inverter loses a single string or loses a plurality of strings, the string loss alarm is carried out, so that the problem of the photovoltaic string loss alarm of the photovoltaic power station can be solved quickly and at low cost, the processing process is simple, the processing result is accurate, the failure solving efficiency of the photovoltaic power station is improved, and therefore, the operation and maintenance capacity of the photovoltaic power station is improved, and for a scene with single or multiple strings, the loss of the strings can be accurately and quickly alarmed, so that the operation and maintenance of customers are simplified.
In addition, according to the embodiment, before the group string loss alarm is performed, the group string loss judgment of the photovoltaic inverter can be performed on the basis of the group string electrical performance parameters of all the group strings under the condition of the preset judgment threshold value. Fig. 4 is a schematic flow chart of another method for warning of string loss of a photovoltaic group according to an embodiment of the present application, where an execution subject of the embodiment may be the photovoltaic inverter in fig. 1 or fig. 2. As shown in fig. 4, the method may include the steps of:
s401: and judging whether the photovoltaic inverter meets the triggering condition of the string access state identification.
S402: and if the photovoltaic inverter meets the triggering condition of the group string access state identification, identifying the group string access state of the photovoltaic inverter according to group string electrical performance parameters of the photovoltaic inverter access group string based on a group string access state identification algorithm, wherein the group string electrical performance parameters comprise at least one of group string current, group string voltage and group string power, and the group string access state comprises at least one of access single-string group string, access multi-string group string and non-access group string.
S403: and on the basis of identifying the string access state of the photovoltaic inverter, judging whether the photovoltaic inverter meets the triggering condition of string loss alarm.
S404: and if the photovoltaic inverter meets the triggering condition of the group string loss alarm, acquiring the group string electrical property parameters of the photovoltaic inverter, and identifying the group string loss of the photovoltaic inverter by combining an inverter group string loss identification algorithm according to the acquired group string electrical property parameters and the group string access state of the photovoltaic inverter.
The steps S401 to S404 are the same as the steps S301 to S304, and are not described herein again.
S405: and based on the group string electrical performance parameters of all the group strings, carrying out group string loss judgment on the photovoltaic inverter under the condition of a preset judgment threshold value, wherein the preset judgment threshold value condition comprises a logical relation or a proportional relation among the group strings, or the absolute value, the relative ratio, the time dimension or the space dimension of the group string electrical performance parameters meet the preset condition.
S406: and if the photovoltaic inverter loses a single string or loses a plurality of strings, performing string loss alarm.
Here, for the pv inverter connected to the string, there is a scene where the string is lost, and on the basis of identifying the string loss of the pv inverter according to the collected string electrical performance parameters and the string connection state of the pv inverter by combining the inverter string loss identification algorithm, the current/voltage/power parameters of the desired string are selected as references, under the condition of a certain determination threshold: the logic relation or the proportional relation between the group strings, or the absolute value/the relative ratio/the time dimension or the space dimension (current/voltage/power) meets the preset condition, and further, the judgment of partial or full loss of the group strings is realized. The photovoltaic inverter is combined with the two steps of operation to judge whether the photovoltaic inverter loses the string, accuracy of a judgment result is further guaranteed, and the method is suitable for practical application.
In the embodiment of the application, after the photovoltaic inverter is judged to meet the triggering condition of the string access state identification, the string access state of the photovoltaic inverter is identified, whether the photovoltaic inverter meets the triggering condition of the string loss alarm is judged on the basis of finishing the identification of the string access state of the photovoltaic inverter, if the string loss alarm is met, the string loss of the photovoltaic inverter is identified according to the collected string electrical performance parameters and the string access state of the photovoltaic inverter by combining an inverter string loss identification algorithm, and meanwhile, parameters such as current, voltage, power and the like of a normal string are selected as references, under a certain judgment threshold condition (current, voltage, power) absolute value/relative ratio, time dimension, space dimension and the like, so that the judgment of partial or total loss of the string is realized, and the string loss alarm is carried out, the identification of the access state of the access string (the string is not accessed, the string is accessed 1, the string is accessed two strings, the string is accessed three strings or the string is accessed N) under the inverter based on the hierarchy of the inverter or the whole power station is realized, and the alarm presentation based on the loss of the string of the inverter solves the problem of the loss alarm of the photovoltaic string of the photovoltaic power station.
Fig. 5 is a schematic structural diagram of a photovoltaic string loss warning device provided in the present application, where the device includes: a triggering judgment module 501 for group string access state identification, a group string access state identification module 502, a triggering judgment module 503 for group string loss alarm, a group string loss identification module 504 and a group string loss alarm module 505.
The triggering judgment module 501 for group string access state identification is configured to judge whether the photovoltaic inverter meets the triggering condition for group string access state identification.
A group string access state identification module 502, configured to identify, based on a group string access state identification algorithm, a group string access state of the pv inverter according to a group string electrical performance parameter of the pv inverter access group string, where the group string electrical performance parameter includes at least one of a group string current, a group string voltage, and a group string power, and the group string access state includes at least one of an access single-string group string, an access multiple-string group string, and a non-access group string.
A triggering and judging module 503 for group string loss alarm, configured to judge whether the photovoltaic inverter meets the triggering condition for group string loss alarm on the basis of completing the identification of the group string access state of the photovoltaic inverter.
A group string loss identification module 504, configured to collect the group string electrical performance parameter of the photovoltaic inverter if the photovoltaic inverter meets the triggering condition of the group string loss alarm, and identify the group string loss of the photovoltaic inverter by combining an inverter group string loss identification algorithm according to the collected group string electrical performance parameter and the group string access state of the photovoltaic inverter.
And a group string loss warning module 505, configured to perform a group string loss warning if the identification result indicates that the photovoltaic inverter loses a single group string or loses multiple group strings.
In one possible design, the triggering condition for identifying the group string access state includes that a parameter of an environment where the photovoltaic inverter is located satisfies a first preset environment condition, and that a group string electrical performance parameter of the photovoltaic inverter satisfies at least one of the first preset group string parameter conditions.
In one possible design, the triggering condition for the group string loss alarm includes that a parameter of an environment where the photovoltaic inverter is located satisfies a second preset environment condition, and that a group string electrical performance parameter of the photovoltaic inverter satisfies at least one of the second preset group string parameter conditions.
In one possible design, the group string loss alarm module 505 is further configured to, before performing the group string loss alarm:
and based on the group string electrical performance parameters of all the group strings, performing group string loss judgment on the photovoltaic inverter under a preset judgment threshold condition, wherein the preset judgment threshold condition comprises a logical relation or a proportional relation between the group strings, or the absolute value, the relative ratio, the time dimension or the space dimension of the group string electrical performance parameters meet the preset condition.
In one possible design, the string loss identification module 504 collects string electrical performance parameters of the pv inverter, and includes:
and collecting the electrical performance parameters of the photovoltaic group strings connected with the photovoltaic inverter according to a preset sampling frequency.
The apparatus of this embodiment may be correspondingly used to implement the technical solutions in the above-described embodiments, and the implementation principles, implementation details, and technical effects thereof are similar and will not be described herein again.
Optionally, fig. 6 schematically provides one possible basic hardware architecture of the computing device described herein.
Referring to fig. 6, computing device 600 includes a processor 601, memory 602, a communication interface 603, and a bus 604.
The computing device 600 may be a computer or a server, and the present application is not limited thereto. In the computing device 600, the number of the processors 601 may be one or more, and fig. 6 only illustrates one of the processors 601. Alternatively, the processor 601 may be a central processing unit. If the computing device 600 has multiple processors 601, the types of the multiple processors 601 may be different, or may be the same. Optionally, the plurality of processors 601 of the computing device 600 may also be integrated as a multi-core processor.
The communication interface 603 may be any one or any combination of the following devices: a network interface (e.g., an ethernet interface), a wireless network card, etc. having a network access function.
Fig. 6 shows the bus 604 by a thick line. The bus 604 may connect the processor 601 with the memory 602 and the communication interface 603. Thus, via bus 604, processor 601 may access memory 602 and may also interact with other computing devices or terminals using communication interface 603.
In the present application, the computing device 600 executes computer instructions in the memory 602, so that the computing device 600 implements the above-mentioned method for warning of photovoltaic string loss provided in the present application, or so that the computing device 600 deploys the above-mentioned device for warning of photovoltaic string loss, such as the above-mentioned device for warning of photovoltaic string loss of fig. 5.
In addition, the photovoltaic string loss warning device may be implemented by software as shown in fig. 6, or may be implemented by hardware as a hardware module or as a circuit unit.
The present application provides a computer-readable storage medium, the computer program product includes computer instructions that instruct a computing device to execute the above-mentioned photovoltaic string loss warning method provided in the present application.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or 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, devices or units, and may be in an electrical, mechanical 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 network 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, or in a form of hardware plus a software functional unit.
Claims (10)
1. A photovoltaic string loss alarm method is characterized by comprising the following steps:
judging whether the photovoltaic inverter meets the triggering condition of group string access state identification;
if the photovoltaic inverter meets the triggering condition of the string access state identification, identifying the string access state of the photovoltaic inverter according to string electrical performance parameters of a string accessed to the string of the photovoltaic inverter based on a string access state identification algorithm, wherein the string electrical performance parameters comprise at least one of string current, string voltage and string power, and the string access state comprises at least one of an accessed single string, an accessed multi-string and an unaccessed string;
on the basis of identifying the string access state of the photovoltaic inverter, judging whether the photovoltaic inverter meets the triggering condition of string loss alarm;
if the photovoltaic inverter meets the triggering condition of the string loss alarm, acquiring the string electrical property parameters of the photovoltaic inverter, and identifying the string loss of the photovoltaic inverter by combining an inverter string loss identification algorithm according to the acquired string electrical property parameters and the string access state of the photovoltaic inverter;
and if the identification result is that the photovoltaic inverter loses a single string or loses a plurality of strings, performing string loss alarm.
2. The method of claim 1, wherein the triggering condition for identifying the string connection state comprises at least one of a parameter of an environment in which the photovoltaic inverter is located satisfying a first preset environment condition and a string electrical property parameter of the photovoltaic inverter satisfying the first preset string parameter condition.
3. The method according to claim 1 or 2, wherein the triggering condition of the group string loss alarm comprises at least one of that a parameter of an environment in which the photovoltaic inverter is located satisfies a second preset environment condition, and that a group string electrical property parameter of the photovoltaic inverter satisfies the second preset group string parameter condition.
4. The method according to any one of claims 1 to 3, further comprising, prior to said performing a group string loss alarm:
and performing string loss judgment on the photovoltaic inverter under a preset judgment threshold condition based on the string electrical performance parameters of all the strings, wherein the preset judgment threshold condition comprises a logical relation or a proportional relation among the strings, or the absolute value, the relative ratio, the time dimension or the space dimension of the string electrical performance parameters meet the preset condition.
5. A photovoltaic string loss warning device, comprising:
the trigger judgment module for group string access state identification is used for judging whether the photovoltaic inverter meets the trigger condition of group string access state identification;
the string access state identification module is used for identifying the string access state of the photovoltaic inverter according to string electrical performance parameters of a string accessed by the photovoltaic inverter based on a string access state identification algorithm if the photovoltaic inverter meets the trigger condition of string access state identification, wherein the string electrical performance parameters comprise at least one of string current, string voltage and string power, and the string access state comprises at least one of a single string accessed string, a plurality of string accessed strings and a plurality of string not accessed strings;
the triggering judgment module is used for judging whether the photovoltaic inverter meets the triggering condition of the group string loss alarm or not on the basis of finishing the identification of the group string access state of the photovoltaic inverter;
the string loss identification module is used for acquiring the string electrical property parameters of the photovoltaic inverter if the photovoltaic inverter meets the triggering condition of the string loss alarm, and identifying the string loss of the photovoltaic inverter by combining an inverter string loss identification algorithm according to the acquired string electrical property parameters and the string access state of the photovoltaic inverter;
and the string loss warning module is used for performing string loss warning if the identification result indicates that the photovoltaic inverter loses a single string or loses a plurality of strings.
6. The apparatus of claim 5, wherein the triggering condition for the string connection status identification comprises at least one of a parameter of an environment in which the photovoltaic inverter is located satisfying a first preset environment condition and a string electrical property parameter of the photovoltaic inverter satisfying the first preset string parameter condition.
7. The apparatus according to claim 5 or 6, wherein the triggering condition of the group string loss alarm includes at least one of that the parameter of the environment in which the photovoltaic inverter is located satisfies a second preset environment condition, and that the group string electrical property parameter of the photovoltaic inverter satisfies the second preset group string parameter condition.
8. The apparatus according to any of claims 5 to 7, wherein the group string loss warning module, prior to the performing the group string loss warning, is further configured to:
and performing string loss judgment on the photovoltaic inverter under a preset judgment threshold condition based on the string electrical performance parameters of all the strings, wherein the preset judgment threshold condition comprises a logical relation or a proportional relation among the strings, or the absolute value, the relative ratio, the time dimension or the space dimension of the string electrical performance parameters meet the preset condition.
9. A computing device, comprising:
comprises a processor and a memory;
the memory to store computer instructions;
the processor, configured to execute the computer instructions stored by the memory, to cause the computing device to perform the method of any of claims 1 to 4.
10. A computer-readable storage medium, wherein the computer program product comprises computer instructions that direct a computing device to perform the method of any of claims 1 to 4.
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