CN110868153B - Inverter starting method, device, equipment and storage medium in photovoltaic system - Google Patents
Inverter starting method, device, equipment and storage medium in photovoltaic system Download PDFInfo
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Abstract
The application discloses a method for starting inverters in a photovoltaic system, which comprises the steps of collecting the current temperature value of each inverter in real time to determine the rated power value of the inverter; collecting the voltage value and the current value of each photovoltaic group string in real time to determine the power value of each photovoltaic group string; and adjusting and changing the access relation between each photovoltaic group string and each inverter according to the power value of each photovoltaic group string and the rated power value of the inverter on the principle of accessing the inverter with the minimum number. According to the photovoltaic power generation system and the photovoltaic power generation method, the access relation between the photovoltaic string and the inverter is adjusted according to the power value of the photovoltaic string and the rated power value of the inverter, the conversion efficiency of a single inverter is improved, the service life of the inverter is prolonged, the operation efficiency of a photovoltaic system is improved, and the operation cost is reduced. The application also provides a device and a system for starting the inverter of the photovoltaic string and a computer-readable storage medium, and the beneficial effects are achieved.
Description
Technical Field
The present disclosure relates to the field of solar cell technologies, and in particular, to a method, an apparatus, a device, and a computer-readable storage medium for starting an inverter in a photovoltaic system.
Background
When sunlight irradiates the photovoltaic string, the photovoltaic string can generate direct current. In daily life, alternating current is used, so that an inverter is required to convert photovoltaic direct current into alternating current meeting the requirements of a power grid. The inverter is generally applied to an inverter in a photovoltaic string, a direct current input end of the inverter is connected to the photovoltaic string, and the number of the connected photovoltaic strings is limited due to the limited rated power of the inverter.
However, in an actual photovoltaic power station, the irradiation of sunlight fluctuates with time during a day, and the electric energy generated by the photovoltaic string changes with time during continuous days, months or even years due to the influence of different weather such as rainy days, sunny days and the like. Accordingly, the electric power input to the inverter cannot be maintained at a constant value. When the electric power input to the inverter is low, the conversion efficiency of the inverter is very low, resulting in low power generation amount.
Disclosure of Invention
The application aims to provide a method, a device and equipment for starting an inverter in a photovoltaic system and a computer readable storage medium, so that the conversion rate of the inverter which is put into use in the photovoltaic system is improved, and the running cost of the photovoltaic system is reduced.
In order to solve the above technical problem, the present application provides a method for starting an inverter in a photovoltaic system, including:
collecting the current temperature value of each inverter;
determining a rated power value of the inverter according to the current temperature value;
collecting the voltage value and the current value of each photovoltaic group string;
determining a power value of each photovoltaic group string according to the voltage value and the current value;
and adjusting and changing the access relation between each photovoltaic string and each inverter according to the power value of each photovoltaic string and the rated power value of the inverter on the principle of accessing the inverter with the minimum number.
Optionally, determining the power value of each photovoltaic string according to the voltage value and the current value includes:
according to the voltage value and the current value, selecting the photovoltaic group string corresponding to the condition that the voltage value is larger than the starting voltage value of the inverter and smaller than the maximum input voltage value, and the current value is larger than the inversion starting current value and smaller than the maximum input current value in each photovoltaic group string;
determining a power value of the selected photovoltaic group string according to the voltage value and the current value of the selected photovoltaic group string;
correspondingly, according to the power value of each photovoltaic string and the rated power value of the inverter, the access strategy between each photovoltaic string and the inverter is determined on the basis of accessing the inverter with the minimum number, and the method comprises the following steps:
and determining the access relation between the selected photovoltaic string and the inverter according to the power value of the selected photovoltaic string and the rated power value of the inverter.
Optionally, after selecting, according to the voltage value and the current value, a photovoltaic group string corresponding to a situation that the voltage value is greater than the starting voltage value of the inverter and is less than the maximum input voltage value, and the current value is greater than the inversion starting current value and is less than the maximum input current value in each photovoltaic group string, the method further includes:
and if the photovoltaic string corresponding to the voltage value larger than the maximum input voltage value and/or the current value larger than the maximum input current value exists in each photovoltaic string, sending an alarm prompt.
Optionally, the adjusting and changing the connection relationship between each photovoltaic string and each inverter includes:
determining photovoltaic group strings which are allowed to be accessed and correspond to the inverters of each type in the inverters of different types according to the voltage value and the current value; the photovoltaic string which is allowed to be accessed by the inverters of the same type is the photovoltaic string of which the voltage value is in the range between the starting voltage value and the maximum input voltage value of the inverters of the same type, and the current value is in the range between the starting current value and the maximum input current value of the inverters of the same type;
preferentially distributing the accessed photovoltaic string according to the inverter with the largest number of the accessible photovoltaic string and the corresponding model; and the photovoltaic string with the least number of types of the corresponding accessible inverters can be accessed into the photovoltaic string of the same type by priority allocation.
Optionally, the adjusting and changing the connection relationship between each photovoltaic string and each inverter includes:
determining the access number of the inverter to be accessed according to the power value sum of each photovoltaic group string, wherein the access number is a positive integer not less than a multiple value of the power sum relative to a rated power value of the inverter;
and when the photovoltaic string is distributed and accessed to each inverter, selecting the photovoltaic string with the sum of a plurality of power values closest to and not greater than the rated power of the inverter to be distributed to the inverters in the photovoltaic string which is not distributed.
Optionally, the adjusting and changing, according to the power value of each photovoltaic string and the rated power value of the inverter, the access relationship between each photovoltaic string and each inverter on the basis of the inverter that is accessed the least includes:
and according to a preset period, updating and adjusting the access relation between the photovoltaic group string and the inverter according to the current power value of the photovoltaic group string and the current rated power of the inverter.
The present application further provides a device for starting an inverter in a photovoltaic system, including:
the first data acquisition module is used for acquiring the current temperature value of each inverter;
the first power operation module is used for determining a rated power value of the inverter according to the current temperature value;
the second data acquisition module is used for acquiring the voltage value and the current value of each photovoltaic group string;
the second power operation module is used for determining the power value of each photovoltaic group string according to the voltage value and the current value;
and the strategy determining module is used for adjusting and changing the access relation between each photovoltaic string and each inverter according to the power value of each photovoltaic string and the rated power value of the inverter and on the principle that the inverter with the minimum access is used.
The present application further provides an inverter commissioning device in a photovoltaic system, comprising:
the voltage sensor and the current sensor are respectively used for detecting the voltage value and the current value of each photovoltaic string;
temperature sensors respectively used for detecting temperature values of the inverters;
the access switching device is respectively connected with the photovoltaic string and the inverters and is used for switching the access relation between each photovoltaic string and each inverter;
and the controller is respectively connected with the voltage sensor, the current sensor, the inverter and the access switching device and is used for controlling the on and off of each inverter according to the voltage value, the current value and the temperature value and sending a command for switching the access relation to the access switching device so as to execute the operation steps of the inverter starting method in the photovoltaic system.
Optionally, the access switching device is a switch group including a plurality of control switches; wherein each photovoltaic string and the inverter can be switched on and off through one control switch.
The present application further provides a computer-readable storage medium having a computer program stored thereon, which, when being executed by a processor, performs the steps of the inverter commissioning method in a photovoltaic system according to any of the above.
The inverter starting method in the photovoltaic system comprises the steps of collecting the current temperature value of each inverter in real time; determining a rated power value of the inverter according to the current temperature value; collecting the voltage value and the current value of each photovoltaic group string in real time; determining the power value of each photovoltaic group string according to the voltage value and the current value; and adjusting and changing the access relation between each photovoltaic group string and each inverter according to the power value of each photovoltaic group string and the rated power value of the inverter on the principle of accessing the inverter with the minimum number.
The power value of the photovoltaic string and the rated power value of the inverter are detected in real time, and then the access strategy between each photovoltaic string and the inverter is adjusted in time, so that the number of the accessed inverters is reduced as much as possible, and the conversion efficiency of a single inverter is improved. Compared with the access mode that the access strategy between each photovoltaic group string and the inverter is fixed in the prior art, the number of the inverters which are put into use is reduced to the greatest extent, so that the time for putting most of the inverters into use is shortened, the service life of the inverters is prolonged, the operation efficiency of a photovoltaic system is improved, and the operation cost is reduced.
The application also provides a device and a system for starting the inverter of the photovoltaic string and a computer-readable storage medium, and the beneficial effects are achieved.
Drawings
For a clearer explanation of the embodiments or technical solutions of the prior art of the present application, the drawings needed for the description of the embodiments or prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic flowchart of a method for commissioning an inverter in a photovoltaic system according to an embodiment of the present disclosure;
fig. 2 is a schematic flowchart of a method for commissioning an inverter in a photovoltaic system according to an embodiment of the present disclosure;
fig. 3 is a block diagram illustrating a configuration of an inverter commissioning apparatus in a photovoltaic system according to an embodiment of the present disclosure;
fig. 4 is a schematic circuit structure diagram of an inverter commissioning apparatus in a photovoltaic system according to an embodiment of the present application.
Detailed Description
In order that those skilled in the art will better understand the disclosure, the following detailed description will be given with reference to the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As shown in fig. 1, fig. 1 is a schematic flowchart of a method for commissioning an inverter in a photovoltaic system according to an embodiment of the present application, where the method may include:
step S11: collecting the current temperature value of each inverter;
step S12: determining a rated power value of the inverter according to the current temperature value;
specifically, when the inverter normally operates, the total power value of the photovoltaic string connected to the inverter needs to be within a certain range, that is, not greater than the rated power value of the inverter.
However, in actual operation, the rated power of the inverter is affected by temperature variations. When the temperature of the inverter is smaller than the temperature threshold value, the rated power value of the inverter is relatively large; conversely, when the temperature of the inverter is greater than the temperature threshold, the rated power value of the inverter is relatively small.
The rated power value of the inverter at the current moment is determined by detecting the temperature of the inverter in real time, and then the adjustment and transformation of the follow-up access relation with the photovoltaic string are realized.
Step S13: collecting the voltage value and the current value of each photovoltaic group string;
step S14: determining the power value of each photovoltaic group string according to the voltage value and the current value;
step S15: and adjusting and changing the access relation between each photovoltaic group string and each inverter according to the power value of each photovoltaic group string and the rated power value of the inverter on the principle of accessing the inverter with the minimum number.
Specifically, the principle of the inverter with the minimum access refers to that the access relationship between each photovoltaic string and the inverter is adjusted, when the total power value of the accessed photovoltaic strings in the plurality of inverters is smaller, the plurality of photovoltaic strings can be accessed into one or a few inverters in a centralized manner, and when the power value of each photovoltaic string is increased, the number of enabled inverters is appropriately increased, so that each photovoltaic string is accessed into more inverters in a scattered manner.
In a photovoltaic system, each inverter needs to be connected with a plurality of photovoltaic string, and the connection relation is fixed and unchangeable. And because of the weather reason and the relation of illumination intensity change in one day, the power value of the photovoltaic string accessed in the inverter is also a corresponding variable value, and in order to ensure that the inverter can normally work, the access distribution can be carried out only according to the principle that the sum of the maximum power of each accessed photovoltaic string is not more than the rated power of the inverter. Because the access relation between the photovoltaic string and the inverter is fixed, when the power generation power of the photovoltaic string is low, the conversion rate of the inverter to the electric energy is reduced, and further the working efficiency of the inverter is low.
In the application, the access relation between each photovoltaic string and the inverter is adjusted according to the power value of each photovoltaic string and the current rated power of the inverter. That is to say, the access relation between the photovoltaic string and the inverter is not fixed but adjustable, and under the condition that the inverter works normally, the number of the inverters which are actually put into use is reduced to the maximum extent, so that the conversion rate of the inverters which are actually put into use is improved to a certain extent; meanwhile, the starting time of the inverter which is not put into use is reduced, the service life of the inverter is further prolonged, and the use cost of the inverter is reduced.
Based on any of the above embodiments, when adjusting the access relationship between each photovoltaic string and each inverter, the method may specifically include:
according to the voltage value and the current value, selecting the photovoltaic group string corresponding to the voltage value which is greater than the starting voltage value of the inverter and less than the maximum input voltage value and the current value which is greater than the inversion starting current value and less than the maximum input current value from each photovoltaic group string;
determining the power value of the selected photovoltaic string according to the voltage value and the current value of the selected photovoltaic string;
it should be noted that, for the inverter, if the voltage value or the current value of the photovoltaic string is too low, even if the photovoltaic string is connected to the inverter, the inverter may not obtain much electric energy, and the inverter may occupy the access port and output relatively low energy.
Therefore, when the photovoltaic string accessed to the inverter is determined, the accessible photovoltaic string is firstly screened, and the photovoltaic string meeting the condition that the voltage value is lower than the starting voltage value of the inverter or the current value is smaller than any one of the starting current values of the inverter is removed without accessing to the inverter.
Further, on the basis that the voltage value and the current value of the pv string both meet the standard for accessing the inverter, the voltage value or the current value of the pv string may be too high due to a fault or some reason, and even higher than the maximum input voltage value and the maximum input current value that the inverter can access, if the pv string with too high voltage value or current value is accessed to the inverter, the inverter may be damaged, and therefore, the pv string with the voltage value higher than the maximum input voltage value of the inverter or the pv string with the current value higher than the maximum input current value of the inverter needs to be further rejected.
Of course, generally speaking, if the voltage value of the pv string is greater than the maximum input voltage value of the inverter, or the current value is greater than the maximum input current value of the inverter, it indicates that the pv string is in an abnormal operating state. An alarm can be sent to a user so that a worker can perform maintenance treatment in time.
Correspondingly, after the photovoltaic string with the voltage value between the starting voltage value and the maximum input voltage value of the inverter and the current value between the starting current value and the maximum input current value of the inverter is selected, the access relation between the inverter and the photovoltaic string is adjusted subsequently, namely the connection between the selected photovoltaic string and the inverter. And the unselected photovoltaic string is directly disconnected with each inverter.
Based on the foregoing embodiment, in another specific embodiment of the present application, when adjusting the access relationship between each photovoltaic string and each inverter, the method may further include:
determining photovoltaic group strings which are allowed to be accessed and correspond to the inverters of each type in the inverters of different types according to the voltage value and the current value;
specifically, similar to the previous embodiment, the photovoltaic strings allowed to be connected by the inverters of the same model are photovoltaic strings of which the voltage values are within a range between the starting voltage value and the maximum input voltage value of the inverters of the same model, and the current values are within a range between the starting current value and the maximum input current value of the inverters of the same model;
preferentially distributing the accessed photovoltaic string according to the inverter with the largest number of the accessible photovoltaic string and the corresponding model; and the photovoltaic strings with the least number of types of the corresponding accessible inverters can be accessed into the inverters preferentially.
In this embodiment, it is further considered that a plurality of inverters of different models may exist in the whole photovoltaic system, and the starting voltage value, the starting current value, the maximum input voltage value, the maximum input current value, and the rated power value of different inverters are different from each other.
Therefore, the voltage value, the current value and the power value of each photovoltaic string can be compared with the starting voltage value, the starting current value, the maximum input voltage value, the maximum input current value and the rated power value of inverters of various types in the photovoltaic system, so as to determine which type of inverter each photovoltaic string can be correspondingly connected into.
Of course, for each photovoltaic string, the access conditions of the inverters of multiple models may be met simultaneously, the access conditions of the inverter of only one model may be met, and even the access conditions of the inverters of any model are not met, the photovoltaic string needs to be rejected.
In order to secure as much as possible that each pv string is more concentrated into one or a few inverters, the inverter with the largest number of accessible pv strings may be preferentially assigned to the pv string.
For example, the photovoltaic string needing to be accessed is a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11 and a12, and the inverter comprises three different models, namely b1, b2 and b 3. The photovoltaic string a1, a2, a3, a4, a5, a6 and a7 all meet the access condition of the inverter b1, the photovoltaic string a5, a6, a7, a8 and a9 all meet the access condition of the inverter b2, the photovoltaic string a6, a7, a8, a9, a10 and a11 all meet the access condition of the inverter b3, but the photovoltaic string a12 does not meet the access condition of any inverter, and therefore the photovoltaic string a12 needs to be directly rejected.
When the distribution of the photovoltaic string access inverters is performed, the photovoltaic string access inverters b1 can be preferentially distributed first because the number of photovoltaic strings accessible by the inverter b1 is the largest. Because the pv string a1, a2, a3 and a4 can only access the inverter b1, the pv string a1, a2, a3 and a4 need to be preferentially allocated to access the pv string b1, for example, for the same power value of the pv string a1 and the pv string a6, the pv string a1 is preferentially allocated to access the inverter b 1.
Based on any of the above embodiments, in another specific embodiment of the present application, when adjusting the access relationship between each photovoltaic string and each inverter, the method may further include:
determining the access number of the inverters to be accessed according to the power value sum of each photovoltaic group string, wherein the access number is a positive integer not less than a multiple value of the power sum relative to the rated power value of the inverter;
and when the photovoltaic string is distributed and accessed to each inverter, selecting the photovoltaic string corresponding to the photovoltaic string with the sum of a plurality of power values closest to and not more than the rated power of the inverter from the photovoltaic strings which are not distributed and distributing the photovoltaic strings to the inverters.
For example, for the sum of the power values of the photovoltaic string a1, a2, a3, a4, a5 and a6 to be 36kw, and the rated power of the inverter to be 20kw, two inverters need to be activated; in addition, the power values of the photovoltaic string a1, a2, a3, a4, a5 and a6 are 5kw, 6kw, 7kw and 7kw respectively, so that the photovoltaic string a4, a5 and a6 can be connected to the first inverter, and the remaining 3 photovoltaic strings are connected to the second inverter, so that the first inverter operates under full power, and the maximum conversion rate is realized.
Of course, in practical applications, there may not be a power value of some photovoltaic string whose sum is exactly equal to the rated power of the inverter, but it is only required to be as close as possible to and not exceed the rated power.
As previously mentioned, each inverter in a photovoltaic system may be of the same type or of a different type. The access allocation manner of the photovoltaic string provided in this embodiment mainly refers to a case where a plurality of photovoltaic strings need to be accessed to an inverter of the same model, or a plurality of accessed inverters of different models, but each photovoltaic string satisfies a condition of being accessed to an inverter of a different model; in summary, the photovoltaic strings may be distributed as in the present embodiment as long as the plurality of photovoltaic strings satisfy the access condition of any one of the plurality of inverters.
Based on any of the above embodiments, considering that in practical applications, the voltage value, the current value, the temperature value of the inverter, and the like of each photovoltaic string all change with time, in order to reduce the number of connected inverters as much as possible on the basis of ensuring the normal operation of the photovoltaic system, it is necessary to frequently adjust the connection relationship between each photovoltaic string and the inverter. Therefore, in practical application, the adjustment of the access relationship between the photovoltaic string and the inverter is performed according to a preset period, and at every preset period, the access relationship between the photovoltaic string and the inverter is adjusted and updated according to the manner described in any of the above embodiments, so as to adapt to the change of the generated power of the photovoltaic string with time.
Because the adjustment of the connection relationship between the photovoltaic string and the inverter is periodically updated, that is, the photovoltaic string and the inverter originally have a certain connection relationship. During actual adjustment, adjustment can be performed based on the original access relation between the photovoltaic string and the inverter.
As shown in table 1 below, table 1 is an adjustment table of the access relationship between the photovoltaic string and the inverter. Before the connection relation between the photovoltaic string and the inverters is not adjusted, the three inverters are connected into 4 photovoltaic strings respectively, wherein the rated power of each inverter is 20 kw. As can be seen from table 1, before the adjustment, the total power value of the photovoltaic string connected to each inverter does not reach the rated power value. The total power value of the photovoltaic string connected to the inverter-2 is the minimum, so that 4 inverters in the inverter-2 can be connected to the other two inverters respectively, the number of the photovoltaic string to be adjusted is reduced, the starting of one inverter is reduced, and the arrow in table 1 indicates the adjustment direction of the photovoltaic string.
Table 1:
of course, the present application may also perform redistribution adjustment completely according to the power value of the current photovoltaic string and the rated power of the inverter without performing adjustment according to the original access relationship, and thus, the present application is not particularly limited.
Based on any of the above embodiments, in another specific embodiment of the present application, as shown in fig. 2, fig. 2 is a schematic flowchart of a method for commissioning an inverter in a photovoltaic system provided in an embodiment of the present application, where the method may include:
step S21: and acquiring the current temperature value of each inverter in real time, and determining the rated power value of the inverter according to the current temperature value.
Step S22: and collecting the voltage value and the current value of each photovoltaic group string in real time, and determining the power value of each photovoltaic group string according to the voltage value and the current value.
Step S23: and rejecting the photovoltaic string which does not meet the access condition according to the voltage value and the current value of each photovoltaic string and the rated power value of each inverter.
Step S24: and determining the photovoltaic string which is allowed to be accessed and corresponds to the inverters of different models according to the voltage value and the current value of each photovoltaic string.
Step S25: and distributing the accessed photovoltaic strings one by one to the inverters of various models, and connecting the inverter of the model with the largest number of the photovoltaic strings to preferentially distribute the accessed photovoltaic strings.
Step S26: and determining the access number of the inverters to be accessed according to the sum of the power values of all the photovoltaic group strings which can be accessed to the inverters of the same type.
Step S27: when each inverter of the same model is distributed with an access photovoltaic string, in each unallocated accessible photovoltaic string, the photovoltaic string corresponding to the power value which is closest to and not greater than the rated power of the inverter is selected and distributed to the inverter.
Step S28: and judging whether all the photovoltaic string groups are distributed completely, if so, finishing the adjustment of the access relation, and if not, entering the step S26.
The inverter commissioning apparatus in the photovoltaic system provided in the embodiments of the present application is described below, and the inverter commissioning apparatus in the photovoltaic system described below and the inverter commissioning method in the photovoltaic system described above may be referred to correspondingly.
Fig. 3 is a block diagram illustrating a structure of an inverter commissioning apparatus in a photovoltaic system according to an embodiment of the present application, where the inverter commissioning apparatus in the photovoltaic system according to fig. 3 may include:
the first data acquisition module 100 is used for acquiring the current temperature value of each inverter in real time;
a first power operation module 200, configured to determine a rated power value of the inverter according to the current temperature value;
the second data acquisition module 300 is used for acquiring the voltage value and the current value of each photovoltaic group string in real time;
a second power operation module 400, configured to determine a power value of each photovoltaic string according to the voltage value and the current value;
and a policy determining module 500, configured to adjust and change an access relationship between each photovoltaic string and each inverter according to the power value of each photovoltaic string and the rated power value of the inverter, based on the inverter with the minimum access.
Optionally, in another specific embodiment of the present application, the second power operation module 400 is specifically configured to select, according to the voltage value and the current value, a photovoltaic string corresponding to the voltage value greater than the starting voltage value of the inverter and smaller than the maximum input voltage value, and the current value greater than the inversion starting current value and smaller than the maximum input current value in each photovoltaic string; determining a power value of the selected photovoltaic group string according to the voltage value and the current value of the selected photovoltaic group string.
The policy determining module 500 is specifically configured to determine an access relationship between the selected pv string and the inverter according to the power value of the selected pv string and the rated power value of the inverter.
Optionally, in another specific embodiment of the present application, the photovoltaic module further includes an alarm module, configured to send an alarm prompt if the voltage value is greater than the maximum input voltage value and/or the current value is greater than the photovoltaic string corresponding to the maximum input current value exists in each photovoltaic string.
Optionally, in another specific embodiment of the present application, the policy determining module 500 is specifically configured to determine, according to the voltage value and the current value, a photovoltaic string that is allowed to be accessed and corresponds to an inverter of each type in the inverters of different types; the photovoltaic string which is allowed to be accessed by the inverters of the same type is the photovoltaic string of which the voltage value is in the range between the starting voltage value and the maximum input voltage value of the inverters of the same type, and the current value is in the range between the starting current value and the maximum input current value of the inverters of the same type; preferentially distributing the accessed photovoltaic string according to the inverter with the largest number of the accessible photovoltaic string and the corresponding model; and the photovoltaic string with the least number of types of the corresponding accessible inverters can be accessed into the photovoltaic string of the same type by priority allocation.
Optionally, in another specific embodiment of the present application, the policy determining module 500 is specifically configured to determine, according to a sum of power values of the respective photovoltaic string, an access number of the inverters to be accessed, where the access number is a positive integer not less than a multiple value of the power sum relative to a rated power value of the inverter; and when the photovoltaic string is distributed and accessed to each inverter, selecting the photovoltaic string with the sum of a plurality of power values closest to and not greater than the rated power of the inverter to be distributed to the inverters in the photovoltaic string which is not distributed.
Optionally, in another specific embodiment of the present application, the policy determining module 500 is specifically configured to update and adjust the access relationship between the photovoltaic string and the inverter according to a preset period and according to a current power value of the photovoltaic string and a current rated power of the inverter.
The inverter commissioning apparatus in the photovoltaic system of this embodiment is used to implement the inverter commissioning method in the photovoltaic system, and therefore specific embodiments of the inverter commissioning apparatus in the photovoltaic system may be found in the foregoing embodiments of the inverter commissioning method in the photovoltaic system, for example, the first data acquisition module 100, the first power operation module 200, the second data acquisition module 300, the second power operation module 400, and the policy determination module 500 are respectively used to implement steps S11, S12, S13, S14, and S15 in the inverter commissioning method in the photovoltaic system, so that the specific embodiments thereof may refer to descriptions of corresponding embodiments of each part, and are not repeated herein.
The application further provides an embodiment of an inverter commissioning enabling device in a photovoltaic system, as shown in fig. 4, fig. 4 is a schematic circuit structure diagram of the inverter commissioning enabling device in the photovoltaic system provided by the embodiment of the application. The device may specifically include:
the voltage sensor 2 and the current sensor 3 are respectively used for detecting the voltage value and the current value of each photovoltaic string 1;
temperature sensors for detecting temperature values of the inverters respectively;
the access switching device 5 is respectively connected with the photovoltaic string 1 and the inverter 4 and is used for switching the access relation between each photovoltaic string 1 and each inverter 4;
and the controller 6 is respectively connected with the voltage sensor 2, the current sensor 3, the inverters 4 and the access switching device, and is used for controlling the on and off of each inverter 4 according to the voltage value, the current value and the temperature value, and sending a command for switching the access relation to the access switching device 5 so as to execute the operation steps of the inverter starting method in the photovoltaic system according to any embodiment.
In this embodiment, the voltage sensor 2 and the current sensor 3 are adopted to detect the voltage value and the current value of each photovoltaic string in real time respectively, and the temperature sensor is matched to detect the real-time temperature of the inverter 4, and meanwhile, the controller collects the detection data of the current sensor 3, the voltage sensor 2 and the temperature sensor to perform comprehensive judgment, determines the access relation between each photovoltaic string 1 and the inverter 4, and sends an instruction for adjusting the access relation to the access switching device 5, so that the adjustability between the photovoltaic strings 1 and the inverter 4 is realized, and on the basis of ensuring the normal operation of the photovoltaic system, the starting number of the inverters 4 is reduced as much as possible, and further the operation cost of the photovoltaic system is reduced.
In particular, the access switching device 5 may be a switch group including a plurality of control switches, and each of the photovoltaic string 1 and the inverter 4 may be turned on and off by one of the control switches.
As shown in fig. 4, the controller 6 can control the control switches at different positions to be turned on and off, so that the photovoltaic strings 1 and the inverters 4 can be turned on and off. And when one inverter is not connected to the photovoltaic string 1, the controller 6 can control the inverter 4 to be turned off.
The present application further provides a computer-readable storage medium having a computer program stored thereon, which, when being executed by a processor, performs the steps of the inverter commissioning method in a photovoltaic system according to any of the above.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of computer-readable storage medium known in the art.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
Claims (9)
1. A method for commissioning an inverter in a photovoltaic system, comprising:
collecting the current temperature value of each inverter;
determining a rated power value of the inverter according to the current temperature value;
collecting the voltage value and the current value of each photovoltaic group string;
determining a power value of each photovoltaic group string according to the voltage value and the current value;
according to the power value of each photovoltaic string and the rated power value of the inverter, the access relation between each photovoltaic string and each inverter is adjusted and changed on the principle that the inverter with the minimum access is used;
determining a power value for each of the strings of photovoltaic strings based on the voltage value and the current value comprises:
according to the voltage value and the current value, selecting the photovoltaic group string corresponding to the condition that the voltage value is larger than the starting voltage value of the inverter and smaller than the maximum input voltage value, and the current value is larger than the inversion starting current value and smaller than the maximum input current value in each photovoltaic group string; rejecting photovoltaic string with voltage value lower than the starting voltage value of the inverter or current value lower than any one of the starting current values of the inverter;
determining a power value of the selected photovoltaic group string according to the voltage value and the current value of the selected photovoltaic group string;
correspondingly, according to the power value of each photovoltaic string and the rated power value of the inverter, the access strategy between each photovoltaic string and the inverter is determined on the basis of accessing the inverter with the minimum number, and the method comprises the following steps:
and determining the access relation between the selected photovoltaic string and the inverter according to the power value of the selected photovoltaic string and the rated power value of the inverter.
2. The method for commissioning an inverter in a photovoltaic system according to claim 1, wherein after selecting a string of photovoltaic groups corresponding to the voltage value greater than the starting voltage value of the inverter and less than a maximum input voltage value and the current value greater than the inversion starting current value and less than a maximum input current value according to the voltage value and the current value, the method further comprises:
and if the photovoltaic string corresponding to the voltage value larger than the maximum input voltage value and/or the current value larger than the maximum input current value exists in each photovoltaic string, sending an alarm prompt.
3. The method of commissioning inverters in a photovoltaic system of claim 1, wherein said adjusting alters an access relationship between each said string of photovoltaic strings and each said inverter comprises:
determining photovoltaic group strings which are allowed to be accessed and correspond to the inverters of each type in the inverters of different types according to the voltage value and the current value; the photovoltaic string which is allowed to be accessed by the inverters of the same type is the photovoltaic string of which the voltage value is in the range between the starting voltage value and the maximum input voltage value of the inverters of the same type, and the current value is in the range between the starting current value and the maximum input current value of the inverters of the same type;
preferentially distributing the accessed photovoltaic string according to the inverter with the largest number of the accessible photovoltaic string and the corresponding model; and the photovoltaic string with the least number of types of the corresponding accessible inverters can be accessed into the photovoltaic string of the same type by priority allocation.
4. The method of commissioning inverters in a photovoltaic system of claim 1, wherein said adjusting alters an access relationship between each said string of photovoltaic strings and each said inverter comprises:
determining the access number of the inverter to be accessed according to the power value sum of each photovoltaic group string, wherein the access number is a positive integer not less than a multiple value of the power sum relative to a rated power value of the inverter;
and when the photovoltaic string is distributed and accessed to each inverter, selecting the photovoltaic string with the sum of a plurality of power values closest to and not greater than the rated power of the inverter to be distributed to the inverters in the photovoltaic string which is not distributed.
5. The method for commissioning inverters in a photovoltaic system according to any one of claims 1 to 4, wherein said adjusting and changing the connection relationship between each said pv string and each said inverter based on the power value of each said pv string and the rated power value of said inverter and based on the minimum number of said inverters comprises:
and according to a preset period, updating and adjusting the access relation between the photovoltaic group string and the inverter according to the current power value of the photovoltaic group string and the current rated power of the inverter.
6. An inverter commissioning apparatus for a photovoltaic system, comprising:
the first data acquisition module is used for acquiring the current temperature value of each inverter;
the first power operation module is used for determining a rated power value of the inverter according to the current temperature value;
the second data acquisition module is used for acquiring the voltage value and the current value of each photovoltaic group string;
the second power operation module is used for determining the power value of each photovoltaic group string according to the voltage value and the current value;
the strategy determining module is used for adjusting and changing the access relation between each photovoltaic string and each inverter according to the power value of each photovoltaic string and the rated power value of the inverter and on the principle that the inverter with the minimum access is used;
the second power operation module is used for selecting the photovoltaic string corresponding to the voltage value which is greater than the starting voltage value of the inverter and is less than the maximum input voltage value and the current value which is greater than the inversion starting current value and is less than the maximum input current value in each photovoltaic string according to the voltage value and the current value, and rejecting the photovoltaic string which can be accessed and has the voltage value which is less than the starting voltage value of the inverter or the photovoltaic string which has the current value which is less than any one of the starting current values of the inverter; determining a power value of the selected photovoltaic group string according to the voltage value and the current value of the selected photovoltaic group string;
and the strategy determining module is used for determining the access relation between the selected photovoltaic string and the inverter according to the power value of the selected photovoltaic string and the rated power value of the inverter.
7. An inverter commissioning apparatus for a photovoltaic system, comprising:
the voltage sensor and the current sensor are respectively used for detecting the voltage value and the current value of each photovoltaic string;
temperature sensors respectively used for detecting temperature values of the inverters;
the access switching device is respectively connected with the photovoltaic string and the inverters and is used for switching the access relation between each photovoltaic string and each inverter;
and the controller is respectively connected with the voltage sensor, the current sensor, the inverters and the access switching device and is used for controlling the on and off of each inverter according to the voltage value, the current value and the temperature value and sending a command for switching the access relation to the access switching device so as to execute the operation steps of the inverter starting method in the photovoltaic system according to any one of claims 1 to 5.
8. The photovoltaic system inverter commissioning apparatus of claim 7, wherein said access switching device is a switch bank comprising a plurality of control switches; wherein each photovoltaic string and the inverter can be switched on and off through one control switch.
9. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of a method for commissioning an inverter in a photovoltaic system according to any one of claims 1 to 5.
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| CN114156864B (en) * | 2021-10-27 | 2023-11-03 | 厦门科灿信息技术有限公司 | Photovoltaic inverter configuration method, device, terminal and storage medium |
| CN114884122A (en) * | 2022-05-10 | 2022-08-09 | 深圳市正浩创新科技股份有限公司 | Charging control method, device and equipment |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101800498A (en) * | 2010-04-01 | 2010-08-11 | 华为技术有限公司 | Solar energy power generation system, control device and control method |
| CN202634315U (en) * | 2012-05-09 | 2012-12-26 | 陕西长岭光伏电气有限公司 | Inverter automatic derating control system |
| CN103178544A (en) * | 2013-03-15 | 2013-06-26 | 特变电工新疆新能源股份有限公司 | Start and stop control method for parallelly-connected multi-unit photovoltaic grid-connected inverter system |
| CN107968433A (en) * | 2017-12-08 | 2018-04-27 | 燕山大学 | A kind of direct current topological structure and control method for improving photovoltaic DC-to-AC converter utilization ratio |
-
2019
- 2019-11-29 CN CN201911202730.9A patent/CN110868153B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101800498A (en) * | 2010-04-01 | 2010-08-11 | 华为技术有限公司 | Solar energy power generation system, control device and control method |
| CN202634315U (en) * | 2012-05-09 | 2012-12-26 | 陕西长岭光伏电气有限公司 | Inverter automatic derating control system |
| CN103178544A (en) * | 2013-03-15 | 2013-06-26 | 特变电工新疆新能源股份有限公司 | Start and stop control method for parallelly-connected multi-unit photovoltaic grid-connected inverter system |
| CN107968433A (en) * | 2017-12-08 | 2018-04-27 | 燕山大学 | A kind of direct current topological structure and control method for improving photovoltaic DC-to-AC converter utilization ratio |
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