CN116260392A - Method, device, equipment, storage medium and program product for obtaining direct current line loss of photovoltaic power station - Google Patents
Method, device, equipment, storage medium and program product for obtaining direct current line loss of photovoltaic power station Download PDFInfo
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Abstract
The invention discloses a method, a device, equipment, a storage medium and a program product for acquiring direct current line loss of a photovoltaic power station. The method comprises the following steps: acquiring parameter information of a corresponding direct current structure associated with a structure type according to the structure type of a photovoltaic power station; calculating the total resistance of the direct current cable according to the parameter information; acquiring the direct current cable resistance of each branch according to the total resistance; measuring the working current of each branch, and determining the loss power of the direct current cable of each branch according to the direct current cable resistance of the branch and the working current of the branch; and obtaining the direct current line loss rate of the photovoltaic power station according to the total lost electric quantity of the photovoltaic power station and the direct current cable lost power of each branch. The technical scheme provided by the invention can be applied to different types of photovoltaic power stations, does not need to additionally increase detection equipment, improves the detection accuracy of the direct current line loss rate, and is convenient for photovoltaic power station operation and management personnel to provide references when fault diagnosis and data analysis are carried out.
Description
Technical Field
The embodiment of the invention relates to the technical field of photovoltaics, in particular to a method, a device, equipment, a storage medium and a program product for acquiring direct current line loss of a photovoltaic power station.
Background
With the continuous expansion of the application range of photovoltaic power generation, the energy efficiency evaluation and loss analysis process in the power generation process become more important. The direct current line loss is an important factor influencing the power generation capacity of the photovoltaic power station.
At present, the direct current line loss rate is obtained, in the prior art, the fixed line loss rate in the STC (standard test condition) state is obtained after the actual measurement and evaluation of the cable voltage drop in the site by a professional detection unit, and the process is complex and the cost is high. In an actual operation state, the change amplitude of the operation working condition of the photovoltaic power station is large, and the power value lost by the direct current cable line is in direct proportion to the square of the current, so that the line loss rate of the STC (standard test condition) state is higher than the actual line loss rate under most working conditions, and the direct current line loss method is simply used for accurately calculating the electric quantity loss caused by the actual direct current line loss in a certain time period under all operation working conditions. In addition, because the voltage drop value of the direct current cable is very small, the accurate value is very difficult to obtain in daily production practice by considering the irregular characteristics of fluctuation amplitude and frequency of the photovoltaic power generation power, different precision of a measuring instrument, interference of communication synchronization and other factors, and therefore, the direct current cable loss scheme is difficult to calculate by monitoring the voltage drop of the direct current cable.
Disclosure of Invention
The invention provides a method, a device, equipment, a storage medium and a program product for acquiring direct current line loss of a photovoltaic power station, which are applicable to different types of photovoltaic power stations, do not need to additionally increase detection equipment, provide stable data by utilizing the existing known parameter information, improve the accuracy of direct current line loss rate detection and are convenient for photovoltaic power station operation and management personnel to provide references when fault diagnosis and data analysis are carried out.
In a first aspect, an embodiment of the present invention provides a method for obtaining a dc line loss of a photovoltaic power station, including:
acquiring parameter information of a corresponding direct current structure associated with a structure type according to the structure type of a photovoltaic power station;
calculating the total resistance of the direct current cable according to the parameter information;
acquiring the direct current cable resistance of each branch according to the total resistance; measuring the working current of each branch, and determining the loss power of the direct current cable of each branch according to the direct current cable resistance of the branch and the working current of the branch;
and obtaining the direct current line loss rate of the photovoltaic power station according to the total lost electric quantity of the photovoltaic power station and the direct current cable lost power of each branch.
Optionally, when the structure type is a photovoltaic power station of a string inverter, the branch includes a photovoltaic branch, and the photovoltaic branch includes a branch formed by connecting photovoltaic modules in series and then connecting to the string inverter; the parameter information comprises the total length of the direct current cable of the photovoltaic branch, the wire diameter of the direct current cable of the photovoltaic branch, the resistivity of the direct current cable of the photovoltaic branch and the number of photovoltaic components;
Calculating the total resistance of the direct current cable according to the parameter information, wherein the method comprises the following steps:
obtaining the direct current cable resistance of the photovoltaic branch according to the total length of the direct current cable of the photovoltaic branch, the wire diameter of the direct current cable of the photovoltaic branch and the resistivity of the direct current cable of the photovoltaic branch;
obtaining contact resistance of the photovoltaic modules and the photovoltaic wiring plugs according to the number of the photovoltaic modules;
and calculating the total resistance according to the direct current cable resistance and the contact resistance of the photovoltaic branch.
Optionally, obtaining the dc line loss rate of the photovoltaic power station according to the total lost power of the photovoltaic power station and the dc cable loss power of the branch includes:
calculating the loss electric quantity of each photovoltaic branch in a selected time period according to the loss power of the direct current cable of the photovoltaic branch;
acquiring the total lost electric quantity of the photovoltaic power station;
and determining the direct current line loss rate in the selected time period according to the sum of the loss electric quantity of the photovoltaic branch circuits and the total loss electric quantity.
Optionally, when the structure type is a photovoltaic power station of a centralized inverter, the branch circuit includes a photovoltaic branch circuit and a combiner box branch circuit; the photovoltaic branch comprises a branch formed by connecting photovoltaic modules in series and then connecting the photovoltaic modules to a direct current combiner box; the junction box branch circuit comprises a branch circuit formed by a direct current junction box to a centralized inverter; the parameter information comprises the total length of the direct current cable of the photovoltaic branch, the wire diameter of the direct current cable of the photovoltaic branch, the resistivity of the direct current cable of the photovoltaic branch, the length of the direct current cable of the combiner box branch, the wire diameter of the direct current cable of the combiner box branch, the resistivity of the direct current cable of the combiner box branch and the number of photovoltaic components;
Calculating the total resistance of the direct current cable according to the parameter information, wherein the method comprises the following steps:
obtaining the direct current cable resistance of the photovoltaic branch according to the total length of the direct current cable of the photovoltaic branch, the wire diameter of the direct current cable of the photovoltaic branch and the resistivity of the direct current cable of the photovoltaic branch;
obtaining contact resistance of the photovoltaic modules and the photovoltaic wiring plugs according to the number of the photovoltaic modules;
calculating the first wire resistance according to the direct current cable resistance and the contact resistance of the photovoltaic branch;
acquiring the second wire resistance according to the length of the direct current cable of the combiner box branch, the wire diameter of the direct current cable of the combiner box branch and the resistivity of the direct current cable of the combiner box branch; and determining the total resistance according to the first line resistance and the second line resistance.
Optionally, acquiring the direct current cable resistance of each branch according to the total resistance; measuring the working current of each branch, and determining the loss power of the direct current cable of each branch according to the direct current cable resistance of the branch and the working current of the branch, wherein the method comprises the following steps:
obtaining a direct current cable resistance corresponding to each photovoltaic branch according to the first resistor and the number of the photovoltaic branches;
Acquiring working current of each photovoltaic branch, and calculating the loss power of the direct current cable of each photovoltaic branch according to the direct current cable resistance of each photovoltaic branch and the working current;
obtaining direct current cable resistance corresponding to each combiner box branch according to the second cable resistance and the number of the combiner box branches;
and acquiring working current of each combiner box branch, and calculating the direct current cable loss power of each combiner box branch according to the direct current cable resistance of each combiner box branch and the working current.
Optionally, obtaining the direct current line loss rate of the photovoltaic power station according to the total lost electric quantity of the photovoltaic power station and the direct current cable loss power of the photovoltaic branch comprises:
calculating the loss electric quantity of each photovoltaic branch in a selected time period according to the loss power of the direct current cable of the photovoltaic branch;
calculating the loss electric quantity of each combiner box branch in a selected time period according to the loss power of the direct current cable of the combiner box branch;
acquiring the total lost electric quantity of the photovoltaic power station;
and determining the direct current line loss rate in the selected time period according to the loss electric quantity of each photovoltaic branch, the loss electric quantity of each combiner box branch and the total loss electric quantity.
In a second aspect, an embodiment of the present invention provides a device for obtaining a dc line loss, including:
the acquisition module is used for acquiring parameter information of a corresponding direct current structure associated with the structure type according to the structure type of the photovoltaic power station;
the first calculation module is used for calculating the total resistance of the direct current cable according to the parameter information;
the second calculation module is used for obtaining the direct current cable resistance of each branch according to the total resistance; measuring the working current of each branch, and determining the loss power of the direct current cable of each photovoltaic branch according to the direct current cable resistance of the branch and the working current of the branch;
and the third calculation module is used for obtaining the direct current line loss rate of the photovoltaic power station according to the total lost electric quantity of the photovoltaic power station and the direct current cable loss power of each branch.
In a third aspect, an embodiment of the present invention provides an electronic device, including: at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,,
the memory stores a computer program executable by the at least one processor, where the computer program is executed by the at least one processor, so that the at least one processor can execute the method for obtaining the dc line loss of the photovoltaic power station according to any of the embodiments of the present invention.
In a fourth aspect, an embodiment of the present invention provides a computer readable storage medium, where a computer instruction is stored, where the computer instruction is configured to cause a processor to execute a method for obtaining a dc line loss of a photovoltaic power plant according to any of the embodiments of the present invention.
In a fifth aspect, an embodiment of the present invention provides a computer program product, which comprises a computer program, which when executed by a processor implements the method for obtaining a dc link loss of a photovoltaic power plant according to any of the embodiments of the present invention.
According to the technical scheme provided by the embodiment of the invention, the parameter information of the corresponding direct current structure related to the structure type is obtained according to the structure type of the photovoltaic power station, the total resistance of the direct current cable can be calculated for the photovoltaic power stations with different structure types, the direct current cable resistance of the branch is obtained by utilizing the total resistance, the direct current cable loss power of the branch is determined according to the direct current cable resistance of the branch and the working current of the branch, and the direct current line loss rate of the photovoltaic power station is obtained according to the total loss electric quantity of the photovoltaic power station and the direct current cable loss power of the branch.
Drawings
Fig. 1 is a flowchart of a method for obtaining a dc line loss of a photovoltaic power station according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a photovoltaic power station with a string inverter according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a photovoltaic power station of a centralized inverter according to an embodiment of the present invention.
Fig. 4 is a flowchart of another method for obtaining a dc line loss of a photovoltaic power station according to an embodiment of the present invention.
Fig. 5 is a flowchart of another method for obtaining a dc line loss of a photovoltaic power station according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a device for obtaining a dc line loss according to an embodiment of the present invention.
Fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 is a flowchart of a method for obtaining a dc line loss of a photovoltaic power station according to an embodiment of the present invention, where the method may be performed by a device for obtaining a dc line loss of a photovoltaic power station, and the device may be implemented in a hardware and/or software manner. The method specifically comprises the following steps:
s110, acquiring parameter information of a corresponding direct current structure associated with the structure type according to the structure type of the photovoltaic power station;
specifically, the structure type of the photovoltaic power station includes a photovoltaic power station of a string inverter and a photovoltaic power station of a centralized inverter, and in different structure types, branches corresponding to the direct current cables are different, for example, in the structure of the photovoltaic power station of the string inverter, the branches include light Fu Zhilu, and the photovoltaic branches include branches formed by connecting photovoltaic modules in series and then connecting to the string inverter; in the structure of a photovoltaic power station of the centralized inverter, the branch circuit comprises a photovoltaic branch circuit and a combiner box branch circuit; the photovoltaic branch comprises a branch formed by connecting photovoltaic modules in series and then connecting the photovoltaic modules to a direct current junction box; the combiner box branch circuit comprises a branch circuit formed by direct current combiner boxes to the centralized inverter. Fig. 2 is a schematic structural diagram of a photovoltaic power station with a string inverter provided in an embodiment of the present invention, where a plurality of photovoltaic modules 110 are connected in series with a string inverter 120 to form a photovoltaic branch, and the string inverter 120 can be connected with a plurality of photovoltaic modules in series. The string inverter 120 output is grid connected to an ac grid 140 through an ac power distribution cabinet 130. The photovoltaic power station of the string type inverter utilizes the string type photovoltaic inverter to directly convert direct current generated by a photovoltaic module into alternating current for total boosting and grid connection. Fig. 3 is a schematic structural diagram of a photovoltaic power station of a centralized inverter according to an embodiment of the present invention, where a plurality of photovoltaic modules 110 are connected in series with a dc combiner box 210 to form a photovoltaic branch, the same dc combiner box 210 may be connected in parallel with a plurality of photovoltaic modules 110 connected in series, the dc combiner box 210 is connected with the centralized inverter 220 through a dc cable to form a combiner box branch, and the output of the centralized inverter 220 is converted into ac current to be boosted and connected to the ac power grid 140. Therefore, after the structural type of the photovoltaic power station is determined, the parameter information such as the total installation length, the wire diameter, the materials, the number of photovoltaic modules, the number of branches and the like of the direct current cable used by the photovoltaic power station can be correspondingly obtained.
S120, calculating the total resistance of the direct current cable according to the parameter information;
specifically, the photovoltaic power stations are different in structure type, and the total resistance of the direct current cables is different in composition, for example, the total resistance of the direct current cables of the photovoltaic power stations of the string inverter is composed of the direct current cable resistance of the photovoltaic branch and the contact resistance of the photovoltaic wiring plug between the photovoltaic modules. The total resistance of the direct current cables of the photovoltaic power station of the centralized inverter is composed of the direct current cable resistance of the photovoltaic branch formed by connecting a plurality of photovoltaic modules in series with the direct current combiner box 210, the direct current cable resistance of the combiner box branch and the contact resistance of the photovoltaic wiring plug between the photovoltaic modules, wherein parameter information can be obtained from installation data and operation parameters of the photovoltaic power station. The total resistance of the direct current cable can be obtained according to the parameter information of the structural type of the photovoltaic power station. It should be noted that it may be preferable to keep the cable length consistent during plant design and construction to avoid possible parallel loss. In practice, there are some unavoidable cases, so that the lengths of the photovoltaic branch cables are different. However, because the number of branches is large and the cable resistance value is small, the cable length of each branch can be set to be consistent for establishing a calculation model.
S130, acquiring the direct current cable resistance of each branch according to the total resistance; measuring the working current of each branch, and determining the loss power of the direct current cable of each branch according to the direct current cable resistance of the branch and the working current of the branch;
specifically, in different structural types, in order to reduce the installation mismatch loss of the photovoltaic power station, it is generally required that the installation capacity of each branch is consistent, that is, the number of photovoltaic modules contained in each branch is equal, and the number of connectors of the photovoltaic modules is consistent with the number of the photovoltaic modules. Therefore, after knowing the total resistance, the total resistance can be equally divided according to the number of the branches, so that the direct current cable resistance of each branch is obtained, and the direct current cable loss power of each branch can be determined by collecting the working current of each branch and utilizing the direct current cable resistance and the working current of the branch.
And S140, obtaining the direct current line loss rate of the photovoltaic power station according to the total loss electric quantity of the photovoltaic power station and the direct current line loss power of each branch.
Specifically, the loss electric quantity of the corresponding branch in the time period between the starting time and the ending time is calculated according to the loss power of the direct current cable of the branch, so that the loss electric quantity of all the branches can be obtained. The total loss electric quantity of the photovoltaic power station is the difference value between the theoretical electric quantity of the photovoltaic power station and the actual electric quantity of the photovoltaic power station, and the direct current line loss rate of the photovoltaic power station can be obtained by making the ratio of the loss electric quantity of all branches to the total loss electric quantity of the photovoltaic power station.
According to the technical scheme provided by the embodiment of the invention, the parameter information of the corresponding direct current structure related to the structure type is obtained according to the structure type of the photovoltaic power station, the total resistance of the direct current cable can be calculated for the photovoltaic power stations with different structure types, the direct current cable resistance of the branch is obtained by utilizing the total resistance, the direct current cable loss power of the branch is determined according to the direct current cable resistance of the branch and the working current of the branch, and the direct current line loss rate of the photovoltaic power station is obtained according to the total loss electric quantity of the photovoltaic power station and the direct current cable loss power of the branch.
Optionally, fig. 4 is a flowchart of another method for obtaining a dc line loss of a photovoltaic power station according to an embodiment of the present invention, and referring to fig. 4 in conjunction with fig. 2, the method includes:
s210, acquiring parameter information of a corresponding direct current structure associated with a structure type according to the structure type of the photovoltaic power station;
When the structure type is a photovoltaic power station of the string type inverter, the branch circuit comprises light Fu Zhilu, and the photovoltaic branch circuit comprises a branch circuit formed by connecting photovoltaic modules in series and then connecting the photovoltaic modules to the string type inverter; the parameter information comprises the total length of the direct current cables of the photovoltaic branches, the wire diameters of the direct current cables of the photovoltaic branches, the resistivity of the direct current cables of the photovoltaic branches, the number of photovoltaic modules and the number of the photovoltaic branches.
S220, obtaining the direct current cable resistance of the photovoltaic branch according to the total length of the direct current cable of the photovoltaic branch, the wire diameter of the direct current cable of the photovoltaic branch and the resistivity of the direct current cable of the photovoltaic branch;
specifically, the direct current cable resistance of the photovoltaic branch is
Wherein L is s The total installation length of the direct current cable of the photovoltaic power station is; ρ s The resistivity of the direct current cable; r is (r) s Is the wire diameter of the direct current cable.
S230, obtaining contact resistance of the photovoltaic modules and the photovoltaic wiring plugs according to the number of the photovoltaic modules;
specifically, the number of plug connectors of the photovoltaic module is consistent with the number of the photovoltaic module, the number of photovoltaic wiring plugs is obtained according to the number of the photovoltaic module, and the contact resistance of the photovoltaic module and the photovoltaic wiring plugs is obtained through the number of the photovoltaic wiring plugs and the contact resistance of the plugs. The contact resistance can be expressed as N s R mc4 ，N s The number of the photovoltaic modules; r is R mc4 The value of the contact resistance of the photovoltaic wiring plug can be obtained by referring to a product specification, and the fact that the contact resistance is affected by environment and external force in the actual application process has an increasing trend can be explained, and the resistance value of the contact resistance can be corrected through periodic measurement.
S240, calculating the total resistance according to the direct current cable resistance and the contact resistance of the photovoltaic branch.
Specifically, the sum of the direct current cable resistance and the contact resistance of the photovoltaic branch is the total resistance, and the total resistance of the direct current cable can be expressed as:
s250, acquiring the direct current cable resistance of each branch according to the total resistance, measuring the working current of the branch, and determining the loss power of the direct current cable of each branch according to the direct current cable resistance of the branch and the working current of the branch;
specifically, according to the operation parameters of the photovoltaic power station, the working current of the photovoltaic branch is collected, and then the loss power of the direct current cable of each photovoltaic branch is as follows:
wherein I is s，i An operating current for the ith photovoltaic branch; p (P) s，i The power is lost for the direct current cable of the ith photovoltaic branch; n is the number of photovoltaic branches.
And S260, obtaining the direct current line loss rate of the photovoltaic power station according to the total loss electric quantity of the photovoltaic power station and the direct current line loss power of each branch.
Based on the above embodiment, optionally, obtaining the dc line loss rate of the photovoltaic power station according to the total lost power of the photovoltaic power station and the dc line loss power of each branch includes:
calculating the loss electric quantity of each photovoltaic branch in a selected time period according to the loss power of the direct current cable of the photovoltaic branch;
obtaining the total lost electric quantity of a photovoltaic power station; and determining the direct current line loss rate in the selected time period according to the sum of the lost electric quantity of the photovoltaic branch circuits and the total lost electric quantity.
Specifically, the lost electric quantity of the lost electric quantity generated by the lost power of the direct current cable of the photovoltaic branch in the selected time period is calculated through integral operation in the starting time and the ending time respectively. The lost electricity of each photovoltaic branch is as follows:
wherein L is s，i At t for the ith photovoltaic branch 1 To t 2 Lost power during the time period; t is t 1 And t 2 The start time and the end time of the selected time period, respectively. The total lost electric quantity of the photovoltaic power station is as follows:
L E ＝E τ -E p
wherein L is E For total lost electric quantity of photovoltaic power station E τ Is a photovoltaic powerStation theoretical power generation; e (E) p The actual power generation amount of the photovoltaic power station. The direct current line loss rate is the ratio of the sum of the loss electric quantity of all the photovoltaic branches to the total loss electric quantity, namely:
LR DC the direct current line loss rate of the photovoltaic power station adopting the series-type inverter is the direct current line loss rate of the photovoltaic power station adopting the series-type inverter.
Optionally, fig. 5 is a flowchart of another method for obtaining a dc line loss of a photovoltaic power station according to an embodiment of the present invention, and referring to fig. 5 in conjunction with fig. 3, the method includes:
s310, acquiring parameter information of a corresponding direct current structure associated with the structure type according to the structure type of the photovoltaic power station;
when the structure type is a photovoltaic power station of the centralized inverter, the branch circuit comprises a photovoltaic branch circuit and a combiner box branch circuit; the photovoltaic branch comprises a branch formed by connecting photovoltaic modules in series and then connecting the photovoltaic modules to a direct current junction box; the junction box branch circuit comprises a branch circuit formed by a direct current junction box to a centralized inverter; the parameter information comprises the total length of the direct current cables of the photovoltaic branch, the wire diameter of the direct current cables of the photovoltaic branch, the resistivity of the direct current cables of the photovoltaic branch, the length of the direct current cables of the combiner box branch, the wire diameter of the direct current cables of the combiner box branch, the resistivity of the direct current cables of the combiner box branch, the number of photovoltaic components, the number of the photovoltaic branches and the number of the combiner box branches.
S320, obtaining the direct current cable resistance of the photovoltaic branch according to the direct current cable length of the photovoltaic branch, the wire diameter of the direct current cable of the photovoltaic branch and the direct current cable resistivity of the photovoltaic branch;
S330, obtaining contact resistance of the photovoltaic modules and the photovoltaic wiring plugs according to the number of the photovoltaic modules;
s340, calculating a first wire resistance according to the direct current cable resistance and the contact resistance of the photovoltaic branch;
specifically, the first line resistance from the photovoltaic module to the direct current combiner box is:
wherein R is DC，cb The first resistor is the first resistor from the photovoltaic module to the direct current combiner box; ρ cb The direct current cable resistivity of the photovoltaic branch; l (L) cb The direct current cable length of the photovoltaic branch is; r is (r) cb The wire diameter of the direct current cable of the photovoltaic branch is the wire diameter of the direct current cable of the photovoltaic branch; n (N) s The number of the photovoltaic modules; r is R mc4 The contact resistance of the photovoltaic wiring plug is obtained.
S350, acquiring a second wire resistance according to the length of the direct current cable of the combiner box branch, the wire diameter of the direct current cable of the combiner box branch and the direct current cable resistivity of the combiner box branch; the total resistance is determined from the first and second resistances.
Specifically, the second line resistance from the direct current combiner box to the centralized inverter is:
wherein R is DC，inv The second line resistance from the direct current combiner box to the centralized inverter; ρ inv The direct current cable resistivity of the combiner box branch; l (L) inv The length of the direct current cable is the length of the branch of the combiner box; r is (r) inv The wire diameter of the direct current cable of the combiner box branch is the wire diameter of the direct current cable of the combiner box branch.
S360, acquiring the direct current cable resistance of each branch according to the total resistance; measuring the working current of each branch, and determining the loss power of the direct current cable of each branch according to the direct current cable resistance of the branch and the working current of the branch;
And S370, obtaining the direct current line loss rate of the photovoltaic power station according to the total loss electric quantity of the photovoltaic power station and the direct current line loss power of each branch.
Based on the above embodiment, optionally, the direct current cable resistance of each branch is obtained according to the total resistance; measuring the working current of each branch, and determining the loss power of the direct current cable of each branch according to the direct current cable resistance of the branch and the working current of the branch, wherein the method comprises the following steps:
obtaining a direct current cable resistance corresponding to each photovoltaic branch according to the first resistor and the number of the photovoltaic branches;
acquiring working current of each photovoltaic branch, and calculating the loss power of the direct current cable of each photovoltaic branch according to the direct current cable resistance and the working current of each photovoltaic branch;
obtaining direct current cable resistance corresponding to each combiner box branch according to the second cable resistance and the number of the combiner box branches;
and acquiring the working current of each combiner box branch, and calculating the direct current cable loss power of each combiner box branch according to the direct current cable resistance and the working current of each combiner box branch.
Specifically, according to the operation parameters of the photovoltaic power station, the working current of the photovoltaic branch is collected, and then the loss power of the direct current cable of each photovoltaic branch is as follows: 
P′ s，i Power is lost to the dc cable of the ith photovoltaic branch.
According to the operation parameters of the photovoltaic power station, collecting the working current of the junction box branch circuits, and then the loss power of the direct current cable of each junction box branch circuit is as follows:
wherein P is cb，j Power is lost for the direct current cable of the j-th combiner box branch; i cb，j The working current of the j-th combiner box branch is the working current of the j-th combiner box branch; m is the total number of combiner boxes, wherein, because the combiner boxes are connected with the centralized inverter in a one-to-one correspondence, the number of the combiner box branches is equal to the total number of the combiner boxes, and therefore the total number of the combiner boxes is taken as the number of the combiner box branches.
Based on the above embodiment, optionally, obtaining the dc line loss rate of the photovoltaic power station according to the total lost power of the photovoltaic power station and the dc line loss power of each branch includes:
calculating the loss electric quantity of each photovoltaic branch in a selected time period according to the loss power of the direct current cable of the photovoltaic branch;
calculating the loss electric quantity of each combiner box branch in a selected time period according to the loss power of the direct-current cable of the combiner box branch;
obtaining the total lost electric quantity of a photovoltaic power station;
and determining the direct current line loss rate in the selected time period according to the loss electric quantity of each photovoltaic branch, the loss electric quantity of each combiner box branch and the total loss electric quantity.
Specifically, the lost electric quantity generated by the lost power of the direct current cable of the photovoltaic branch and the lost electric quantity generated by the lost power of the direct current cable of the combiner box branch in the starting time and the ending time are calculated through integral operation. The lost electricity of each photovoltaic branch is as follows:
the loss electric quantity of each combiner box branch circuit is as follows:
wherein L' s，i At t for the ith photovoltaic branch 1 To t 2 Lost power during the time period; l (L) cb，j At t for the jth combiner box branch 1 To t 2 Lost power during the time period.
The total lost electric quantity of the photovoltaic power station is as follows:
L E ＝E τ -E p
wherein L is E For total lost electric quantity of photovoltaic power station E τ The theoretical generating capacity of the photovoltaic power station is; e (E) p The actual power generation amount of the photovoltaic power station. The direct current line loss rate is the ratio of the total of the lost electric quantity of all photovoltaic branches and the lost electric quantity of all combiner box branches to the total lost electric quantity, namely:
LR DC the direct current line loss rate of the photovoltaic power station adopting the series-type inverter is the direct current line loss rate of the photovoltaic power station adopting the series-type inverter.
Fig. 6 is a schematic structural diagram of a device for obtaining a dc line loss according to an embodiment of the present invention, referring to fig. 6, including:
the obtaining module 610 is configured to obtain parameter information of a corresponding dc structure associated with a structure type according to the structure type of the photovoltaic power station;
a first calculation module 620, configured to calculate a total resistance of the dc cable according to the parameter information;
The second calculation module 630 is configured to obtain a dc cable resistance of each branch according to the total resistance; measuring the working current of each branch, and determining the loss power of the direct current cable of each branch according to the direct current cable resistance of the branch and the working current of the branch;
the third calculation module 640 is configured to obtain a dc line loss rate of the photovoltaic power station according to the total lost power of the photovoltaic power station and the dc line loss power of each branch.
Specifically, the structure type of the photovoltaic power station includes the photovoltaic power station of the string inverter and the photovoltaic power station of the centralized inverter, so after the structure type of the photovoltaic power station is determined, the obtaining module 610 can correspondingly obtain the parameter information such as the total installation length, the line diameter, the material, the number of photovoltaic components, the number of photovoltaic branches and the like of the direct current cable used by the photovoltaic power station from the installation data and the operation parameters of the photovoltaic power station. The first calculation module 620 may obtain the total resistance of the dc cable according to the parameter information of the structural type of the photovoltaic power station.
In different structural types, in order to reduce the installation mismatch loss of the photovoltaic power station, the installation capacity of each branch is generally required to be consistent, that is, the number of photovoltaic modules contained in each branch is equal, and the number of plug connectors of the photovoltaic modules is consistent with the number of the photovoltaic modules. Therefore, after knowing the total resistance, the second calculation module 630 may divide the total resistance equally according to the number of branches, so as to obtain the dc cable resistance of each branch, and by collecting the working current of each branch, the dc cable loss power of each branch may be determined by using the dc cable resistance and the working current of the branch.
The third calculation module 640 calculates the loss electric quantity of the corresponding branch in the time period between the starting time and the ending time according to the loss power of the direct current cable of the branch, so that the loss electric quantity of all branches can be obtained. The total loss electric quantity of the photovoltaic power station is the difference value between the theoretical electric quantity of the photovoltaic power station and the actual electric quantity of the photovoltaic power station, and the direct current line loss rate of the photovoltaic power station can be obtained by making the ratio of the loss electric quantity of all branches to the total loss electric quantity of the photovoltaic power station.
According to the technical scheme provided by the embodiment of the invention, the acquisition module acquires the parameter information of the corresponding direct current structure related to the structure type according to the structure type of the photovoltaic power station, the first calculation module can calculate the total resistance of the direct current cable aiming at the photovoltaic power stations with different structure types, the second calculation module further acquires the direct current cable resistance of the branch by utilizing the total resistance and determines the direct current cable loss power of the branch according to the direct current cable resistance of the branch and the working current of the branch, and the third calculation module acquires the direct current line loss rate of the photovoltaic power station according to the total loss electric quantity of the photovoltaic power station and the direct current cable loss power of the branch.
Fig. 7 is a schematic diagram of an electronic device provided in an embodiment of the present invention, and referring to fig. 7, an electronic device 10 may perform the above-described embodiment of the present invention, and the electronic device is intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other suitable computers. Electronic equipment may also represent various forms of mobile devices, such as personal digital processing, cellular telephones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed herein.
As shown in fig. 7, the electronic device 10 includes at least one processor 11, and a memory, such as a Read Only Memory (ROM) 12, a Random Access Memory (RAM) 13, etc., communicatively connected to the at least one processor 11, in which the memory stores a computer program executable by the at least one processor, and the processor 11 may perform various appropriate actions and processes according to the computer program stored in the Read Only Memory (ROM) 12 or the computer program loaded from the storage unit 18 into the Random Access Memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 may also be stored. The processor 11, the ROM 12 and the RAM 13 are connected to each other via a bus 14. An input/output (I/O) interface 15 is also connected to bus 14.
Various components in the electronic device 10 are connected to the I/O interface 15, including: an input unit 16 such as a keyboard, a mouse, etc.; an output unit 17 such as various types of displays, speakers, and the like; a storage unit 18 such as a magnetic disk, an optical disk, or the like; and a communication unit 19 such as a network card, modem, wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information/data with other devices via a computer network, such as the internet, and/or various telecommunication networks.
The processor 11 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various processors running machine learning model algorithms, digital Signal Processors (DSPs), and any suitable processor, controller, microcontroller, etc. The processor 11 performs the various methods and processes described above, such as the method of obtaining the dc link loss of a photovoltaic power plant.
In some embodiments, the method of obtaining the photovoltaic power plant direct current line loss may be implemented as a computer program tangibly embodied on a computer readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program may be loaded and/or installed onto the electronic device 10 via the ROM 12 and/or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the method of obtaining the direct current line losses of a photovoltaic power plant described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to perform the method of obtaining the direct current line losses of the photovoltaic power plant by any other suitable means (e.g. by means of firmware).
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuitry, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems On Chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs, the one or more computer programs may be executed and/or interpreted on a programmable system including at least one programmable processor, which may be a special purpose or general-purpose programmable processor, that may receive data and instructions from, and transmit data and instructions to, a storage system, at least one input device, and at least one output device.
A computer program for carrying out methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be implemented. The computer program may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) through which a user can provide input to the electronic device. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic input, speech input, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a background component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such background, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), blockchain networks, and the internet.
The computing system may include clients and servers. The client and server are typically remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical hosts and VPS service are overcome.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. The method for obtaining the direct current line loss of the photovoltaic power station is characterized by comprising the following steps of:
acquiring parameter information of a corresponding direct current structure associated with a structure type according to the structure type of a photovoltaic power station;
calculating the total resistance of the direct current cable according to the parameter information;
acquiring the direct current cable resistance of each branch according to the total resistance; measuring the working current of each branch, and determining the loss power of the direct current cable of each branch according to the direct current cable resistance of the branch and the working current of the branch;
And obtaining the direct current line loss rate of the photovoltaic power station according to the total lost electric quantity of the photovoltaic power station and the direct current cable lost power of each branch.
2. The method for obtaining direct current line loss of a photovoltaic power station according to claim 1, wherein when the structure type is a photovoltaic power station of a string inverter, the branch circuit comprises a photovoltaic branch circuit, and the photovoltaic branch circuit comprises a branch circuit formed by connecting photovoltaic modules in series and then connecting to the string inverter; the parameter information comprises the total length of the direct current cable of the photovoltaic branch, the wire diameter of the direct current cable of the photovoltaic branch, the resistivity of the direct current cable of the photovoltaic branch and the number of photovoltaic components;
calculating the total resistance of the direct current cable according to the parameter information, wherein the method comprises the following steps:
obtaining the direct current cable resistance of the photovoltaic branch according to the total length of the direct current cable of the photovoltaic branch, the wire diameter of the direct current cable of the photovoltaic branch and the resistivity of the direct current cable of the photovoltaic branch;
obtaining contact resistance of the photovoltaic modules and the photovoltaic wiring plugs according to the number of the photovoltaic modules;
and calculating the total resistance according to the direct current cable resistance and the contact resistance of the photovoltaic branch.
3. The method of obtaining a dc line loss of a photovoltaic power plant according to claim 2, wherein obtaining a dc line loss rate of the photovoltaic power plant from a total lost power of the photovoltaic power plant and a dc cable loss power of the branch comprises:
Calculating the loss electric quantity of each photovoltaic branch in a selected time period according to the loss power of the direct current cable of the photovoltaic branch;
acquiring the total lost electric quantity of the photovoltaic power station;
and determining the direct current line loss rate in the selected time period according to the sum of the loss electric quantity of the photovoltaic branch circuits and the total loss electric quantity.
4. The method for obtaining direct current line loss of a photovoltaic power plant according to claim 1, wherein when the structure type is a photovoltaic power plant of a centralized inverter, the branches comprise a photovoltaic branch and a combiner box branch; the photovoltaic branch comprises a branch formed by connecting photovoltaic modules in series and then connecting the photovoltaic modules to a direct current combiner box; the junction box branch circuit comprises a branch circuit formed by a direct current junction box to a centralized inverter; the parameter information comprises the total length of the direct current cable of the photovoltaic branch, the wire diameter of the direct current cable of the photovoltaic branch, the resistivity of the direct current cable of the photovoltaic branch, the length of the direct current cable of the combiner box branch, the wire diameter of the direct current cable of the combiner box branch, the resistivity of the direct current cable of the combiner box branch and the number of photovoltaic components;
calculating the total resistance of the direct current cable according to the parameter information, wherein the method comprises the following steps:
obtaining the direct current cable resistance of the photovoltaic branch according to the total length of the direct current cable of the photovoltaic branch, the wire diameter of the direct current cable of the photovoltaic branch and the resistivity of the direct current cable of the photovoltaic branch;
Obtaining contact resistance of the photovoltaic modules and the photovoltaic wiring plugs according to the number of the photovoltaic modules;
calculating a first wire resistance according to the direct current cable resistance and the contact resistance of the photovoltaic branch;
acquiring a second wire resistance according to the length of the direct current cable of the combiner box branch, the wire diameter of the direct current cable of the combiner box branch and the resistivity of the direct current cable of the combiner box branch; and determining the total resistance according to the first line resistance and the second line resistance.
5. The method for obtaining direct current line loss of a photovoltaic power station according to claim 4, wherein the direct current cable resistance of each branch is obtained according to the total resistance; measuring the working current of each branch, and determining the loss power of the direct current cable of each branch according to the direct current cable resistance of the branch and the working current of the branch, wherein the method comprises the following steps:
obtaining a direct current cable resistance corresponding to each photovoltaic branch according to the first resistor and the number of the photovoltaic branches;
acquiring working current of each photovoltaic branch, and calculating the loss power of the direct current cable of each photovoltaic branch according to the direct current cable resistance of each photovoltaic branch and the working current;
obtaining direct current cable resistance corresponding to each combiner box branch according to the second cable resistance and the number of the combiner box branches;
And acquiring working current of each combiner box branch, and calculating the direct current cable loss power of each combiner box branch according to the direct current cable resistance of each combiner box branch and the working current.
6. The method of obtaining a dc line loss of a photovoltaic power plant according to claim 5, wherein obtaining a dc line loss rate of the photovoltaic power plant from a total lost power of the photovoltaic power plant and a dc cable lost power of the photovoltaic branch comprises:
calculating the loss electric quantity of each photovoltaic branch in a selected time period according to the loss power of the direct current cable of the photovoltaic branch;
calculating the loss electric quantity of each combiner box branch in a selected time period according to the loss power of the direct current cable of the combiner box branch;
acquiring the total lost electric quantity of the photovoltaic power station;
and determining the direct current line loss rate in the selected time period according to the loss electric quantity of each photovoltaic branch, the loss electric quantity of each combiner box branch and the total loss electric quantity.
7. An apparatus for obtaining a direct current line loss, comprising:
the acquisition module is used for acquiring parameter information of a corresponding direct current structure associated with the structure type according to the structure type of the photovoltaic power station;
The first calculation module is used for calculating the total resistance of the direct current cable according to the parameter information;
the second calculation module is used for obtaining the direct current cable resistance of each branch according to the total resistance; measuring the working current of each branch, and determining the loss power of the direct current cable of each photovoltaic branch according to the direct current cable resistance of the branch and the working current of the branch;
and the third calculation module is used for obtaining the direct current line loss rate of the photovoltaic power station according to the total lost electric quantity of the photovoltaic power station and the direct current cable loss power of each branch.
8. An electronic device, the electronic device comprising:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the method of obtaining a direct current line loss of a photovoltaic power plant of any one of claims 1-6.
9. A computer readable storage medium, characterized in that the computer readable storage medium stores computer instructions for causing a processor to execute the method of obtaining a direct current line loss of a photovoltaic power plant according to any one of claims 1-6.
10. A computer program product, characterized in that the computer program product comprises a computer program which, when being executed by a processor, implements the method of obtaining direct current line losses of a photovoltaic power plant according to any one of claims 1-6.
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