A method, device and equipment for analyzing the obstructed electricity quantity of a photovoltaic power station

Abstract

The present invention provides a method, device and equipment for analyzing the blocked power of a photovoltaic power station. By constructing a target relationship between the instantaneous power and irradiation intensity of a model inverter of a photovoltaic power station during a non-power-limited period and the available power of the inverter in the photovoltaic power station, after obtaining the instantaneous power and irradiation intensity of the model inverter during the power-limited period, the available power of each inverter of the photovoltaic power station at each moment during the power-limited period can be calculated based on the target relationship, and then based on the available power and the active power of the inverter of the photovoltaic power station during the power-limited period, the abandoned photovoltaic power of the photovoltaic power station during the power-limited period is calculated. This calculation method is not affected by the simultaneous rate of the actual output of the photovoltaic power station, and improves the accuracy of the calculation result of the abandoned photovoltaic power.

Description

Technical Field

[0001] The present invention relates to the technical field of equipment monitoring, and in particular to a method and device for analyzing the obstructed electricity quantity of a photovoltaic power station. Background Art

[0002] At present, since the domestic photovoltaic power generation industry has not yet formed a standard for the evaluation algorithm of abandoned photovoltaic power (the amount of electricity that photovoltaic power stations can generate but cannot generate due to factors such as system peak regulation and grid safety), the existing method for calculating abandoned photovoltaic power is generally to calculate the difference between the output of the photovoltaic power station and the installed capacity, and then integrate it to obtain the abandoned photovoltaic power. However, for a million-kilowatt photovoltaic power generation base, the actual simultaneous output rate of each photovoltaic power station is generally low, so using this method to calculate generally results in inaccurate evaluation of blocked electricity and calculation of abandoned photovoltaic status. Summary of the invention

[0003] In view of this, an embodiment of the present invention provides a method, device and equipment for analyzing the blocked electricity of a photovoltaic power station, so as to achieve accurate calculation of the abandoned electricity amount of the photovoltaic power station.

[0004] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0005] A method for analyzing the obstructed electricity quantity of a photovoltaic power station, comprising:

[0006] Acquire a target relationship, where the target relationship is used to characterize at least a mapping relationship between the instantaneous power and irradiation intensity of a sample inverter in a photovoltaic power station during a non-power-cutoff period and the available power of the inverter of the photovoltaic power station;

[0007] Obtain the instantaneous power and irradiance of the sample inverter during the power-limited period;

[0008] Based on the instantaneous power and irradiation intensity of the sample inverter during the power-limited period and the target relationship, the available power of the inverter of the photovoltaic power station at each moment during the power-limited period is calculated;

[0009] Based on the available power of the inverter of the photovoltaic power station at each moment during the power-limited period and the active power of the inverter of the photovoltaic power station at each moment during the power-limited period, the amount of abandoned photovoltaic power in the photovoltaic power station during the power-limited period is calculated.

[0010] Optionally, in the above-mentioned photovoltaic power station obstructed electricity analysis method, obtaining the target relationship includes:

[0011] Obtain the irradiance intensity of the sample inverter in the photovoltaic power station at each time during the non-power-limited period;

[0012] Calculate the instantaneous power of the sample inverter in the photovoltaic power station at each moment during the non-power-limited period;

[0013] Calculate the average available power of each inverter of the photovoltaic power station at each time during the non-power-limited period;

[0014] Taking the instantaneous power at each moment and the irradiation intensity at each moment as features, taking the average available power at each moment as a target value, linear fitting is performed on the instantaneous power, irradiation intensity and average available power to obtain a target relationship.

[0015] Optionally, in the above-mentioned photovoltaic power station blocked power analysis method, calculating the instantaneous power of the sample inverter in the photovoltaic power station at each moment during the non-power-limited period includes:

[0016] Calculate the instantaneous power of N sample inverters in the photovoltaic power station at each moment during the non-power-limited period, where N is a positive integer not less than 2;

[0017] The instantaneous powers of N sample inverters at the same time are averaged to obtain the average instantaneous power of the sample inverter at each time, and the average instantaneous power is used as the instantaneous power of the sample inverter at each time.

[0018] Optionally, in the above-mentioned photovoltaic power station blocked power analysis method, based on the instantaneous power, irradiation intensity and the target relationship of the sample inverter during the power-limited period, the available power of the inverter of the photovoltaic power station at each moment during the power-limited period is calculated; based on the available power of the photovoltaic power station at each moment during the power-limited period and the active power of the photovoltaic power station at each moment during the power-limited period, the abandoned photovoltaic power of the photovoltaic power station during the power-limited period is calculated, including:

[0019] Substituting the instantaneous power and irradiation intensity of each model inverter during the power-limited period into the target relationship, and calculating the active power of each model inverter during each power-limited period;

[0020] The calculated active powers of the various model inverters at the same time are averaged to obtain the average active powers of the model inverters at various times during the power-limited period;

[0021] Obtain the actual power generated by each inverter at each time during the power-limited period;

[0022] The actual power generated at each moment is averaged to obtain the average actual power generated by the inverter at each moment during the power-limited period;

[0023] Based on the average active power, the average actual power and the total number of inverters, the amount of abandoned photovoltaic power in the photovoltaic power station during the power-limited period is calculated.

[0024] Optionally, in the above-mentioned photovoltaic power station blocked electricity analysis method, before obtaining the active power of the photovoltaic power station during the power-limited period and the irradiation intensity during the power-limited period, the method further includes:

[0025] Based on the ratio of the active power of the photovoltaic power station at each moment to the given power, the start moment and the end moment of the power-restriction period are marked, and the time period formed by the start moment and the end moment is used as the power-restriction period.

[0026] Optionally, in the above-mentioned photovoltaic power station blocked power analysis method, based on the preset ratio of available power to active power of the photovoltaic power station at each moment, marking the start and end times of the power restriction period includes:

[0027] Calculate the ratio of the active power of the photovoltaic power station at the current moment to the given power;

[0028] Determining whether the ratio is greater than a preset ratio;

[0029] If the ratio corresponding to the current moment is greater than the preset ratio, determine whether the ratio corresponding to the previous moment is less than the preset ratio;

[0030] If the ratio corresponding to the previous moment is not greater than the preset ratio, marking the current moment as the starting moment of the power-limited period;

[0031] If the ratio corresponding to the current moment is not greater than the preset ratio, determine whether the ratio corresponding to the previous moment is greater than the preset ratio;

[0032] If the ratio corresponding to the previous moment is greater than the preset ratio, the current moment is marked as the end moment of the power-limited period.

[0033] Optionally, the above-mentioned photovoltaic power station obstruction power analysis method further includes:

[0034] Determining whether a target condition occurs in the photovoltaic power station, wherein the target condition refers to a condition that affects a change in output power of the photovoltaic power station;

[0035] If the target situation occurs, the target relationship is updated based on the instantaneous power of the model inverter in the photovoltaic power plant, the irradiation intensity, and the available power of the photovoltaic power plant during the non-blackout period after the target situation occurs.

[0036] Optionally, in the above-mentioned method for analyzing the blocked power of a photovoltaic power station, after calculating the abandoned photovoltaic power of the photovoltaic power station during the power-limited period, the method further includes:

[0037] It is determined whether the abandoned photovoltaic power quantity is greater than a pre-marked photovoltaic power quantity threshold, and if so, an alarm signal is generated.

[0038] A photovoltaic power station obstruction power analysis device, comprising:

[0039] An association relationship acquisition unit, used to acquire a target relationship, wherein the target relationship is used to characterize at least a mapping relationship between the instantaneous power and irradiation intensity of a sample inverter in a photovoltaic power station during a non-power-cutoff period and the available power of the inverter of the photovoltaic power station;

[0040] A power-limiting parameter acquisition unit is used to obtain the instantaneous power and radiation intensity of the sample inverter during the power-limiting period;

[0041] An available power calculation unit, configured to calculate the available power of the inverter of the photovoltaic power station at each moment during the power-limited period based on the instantaneous power of the model inverter during the power-limited period, the irradiation intensity and the target relationship;

[0042] The abandoned photovoltaic power calculation unit is used to calculate the abandoned photovoltaic power of the photovoltaic power station during the power-limited period based on the available power of the inverter of the photovoltaic power station at each time during the power-limited period and the active power of the inverter of the photovoltaic power station at each time during the power-limited period.

[0043] A photovoltaic power station obstructed electricity quantity analysis device, comprising: a memory and a processor;

[0044] The memory stores a program suitable for execution by the processor, wherein the program is used to:

[0045] Acquire a target relationship, where the target relationship is used to characterize at least a mapping relationship between the instantaneous power and irradiation intensity of a sample inverter in a photovoltaic power station during a non-power-cutoff period and the available power of the inverter of the photovoltaic power station;

[0046] Obtain the instantaneous power and irradiance of the sample inverter during the power-limited period;

[0047] Based on the instantaneous power and irradiation intensity of the sample inverter during the power-limited period and the target relationship, the available power of the inverter of the photovoltaic power station at each moment during the power-limited period is calculated;

[0048] Based on the available power of the inverter of the photovoltaic power station at each moment during the power-limited period and the active power of the inverter of the photovoltaic power station at each moment during the power-limited period, the amount of abandoned photovoltaic power in the photovoltaic power station during the power-limited period is calculated.

[0049] Based on the above technical scheme, the above scheme provided by the embodiment of the present invention constructs a target relationship between the instantaneous power and irradiation intensity of the model inverter of the photovoltaic power station during the non-power-limited period and the available power of the inverter in the photovoltaic power station. After obtaining the instantaneous power and irradiation intensity of the model inverter during the power-limited period, the available power of each inverter of the photovoltaic power station at each moment during the power-limited period can be calculated based on the target relationship, and then the amount of abandoned photovoltaic power of the photovoltaic power station during the power-limited period is calculated based on the available power and the active power of the inverter of the photovoltaic power station during the power-limited period. This calculation method is not affected by the simultaneity rate of the actual output of the photovoltaic power station, thereby improving the accuracy of the calculation result of the abandoned photovoltaic power. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0051] Figure 1 A schematic diagram of the flow chart of the method for analyzing the obstructed electricity quantity of a photovoltaic power station disclosed in an embodiment of the present application;

[0052] Figure 2 This is a flow chart of a method for analyzing the obstructed electricity quantity in a photovoltaic power station disclosed in this application in another embodiment of this application;

[0053] Figure 3 A schematic diagram of a flow chart of a method for analyzing blocked electricity in a photovoltaic power station disclosed in another embodiment of the present application;

[0054] Figure 4 A schematic diagram of a flow chart of a method for analyzing blocked electricity in a photovoltaic power station disclosed in another embodiment of the present application;

[0055] Figure 5 A schematic diagram of a flow chart of a method for analyzing blocked electricity in a photovoltaic power station disclosed in another embodiment of the present application;

[0056] Figure 6 A schematic diagram of the structure of a photovoltaic power station obstruction power analysis device disclosed in an embodiment of the present application;

[0057] Figure 7 This is a schematic structural diagram of a photovoltaic power station obstruction power analysis device disclosed in an embodiment of the present application. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] An embodiment of the present application discloses a method for analyzing the blocked power of a photovoltaic power station. By constructing a relationship between the available power and the irradiation intensity of the photovoltaic power station, after obtaining the irradiation intensity of the photovoltaic power station during the power-limited period, the available power of the photovoltaic power station at each moment during the power-limited period is calculated based on the relationship, and then the amount of abandoned photovoltaic power of the photovoltaic power station during the power-limited period is calculated based on the available power and the active power of the photovoltaic power station during the power-limited period.

[0060] See also Figure 1 The method for analyzing the obstructed electricity quantity of a photovoltaic power station disclosed in the embodiment of the present application may include:

[0061] Step S101: obtaining a target relationship, wherein the target relationship is used to characterize at least a mapping relationship between the instantaneous power and irradiation intensity of a sample inverter in a photovoltaic power station during a non-blackout period and the available power of the inverter of the photovoltaic power station.

[0062] There will be multiple inverters in a photovoltaic power station, each inverter will be connected to multiple photovoltaic panels, convert the DC power output by these photovoltaic panels into AC power, and perform grid-connected operation. In this solution, the sample method can be used to use one or some representative inverters among these inverters as sample inverters. In this solution, all the inverters mentioned are inverters of the same model, and the configuration parameters of the inverter and the number of photovoltaic panels connected are the same.

[0063] The instantaneous power of the model inverter refers to the power value that the model inverter can output per unit time when it is in theoretical working conditions under the current irradiation intensity;

[0064] The irradiance intensity may refer to the intensity of the light resource received by the sample inverter;

[0065] During the non-power-limited period, the available power of the inverter of the photovoltaic power station refers to the actual output power of each inverter per unit time in the photovoltaic power station.

[0066] The applicant found through correlation analysis that during the non-power-limited period, the correlation coefficient between the available power of each inverter in the photovoltaic power station and the irradiation intensity and instantaneous power of the model inverter reached more than 90%. Therefore, linear regression can be used to fit the available power of the inverter during the non-power-limited period with the irradiation intensity and instantaneous power of the model inverter as characteristics to obtain the target relationship.

[0067] Step S102: Obtain the instantaneous power and radiation intensity of the sample inverter during the power-cutoff period.

[0068] In this step, the irradiance intensity of each sample inverter is detected to obtain the irradiance intensity of the sample inverter during the power-limited period;

[0069] The instantaneous power of each model inverter is calculated based on the radiation intensity during the power-limited period and the relevant configuration parameters of the model inverter.

[0070] Step S103: Based on the instantaneous power and irradiation intensity of the model inverter during the power-limited period and the target relationship, the available power of the inverter of the photovoltaic power station at each moment during the power-limited period is calculated.

[0071] By substituting the instantaneous power and irradiation intensity of the model inverter during the power-limited period into the target relationship, the available power of the inverter of the photovoltaic power station at each moment during the power-limited period can be calculated. Here, the available power is used to characterize the predicted average available power of the inverter of the photovoltaic power station at each moment during the power-limited period.

[0072] Step S104: based on the available power of the inverter of the photovoltaic power station at each moment during the power-cut period and the active power of the inverter of the photovoltaic power station at each moment during the power-cut period, the amount of abandoned photovoltaic power in the photovoltaic power station during the power-cut period is calculated.

[0073] The active power of the inverter of the photovoltaic power station at each moment during the power-limited period may refer to the average output power of all inverters of the photovoltaic power station at each moment during the power-limited period, and the average output power may be obtained by measuring the inverter output and performing average calculation.

[0074] In this step, after calculating the available power of the inverter of the photovoltaic power station at each moment and the active power of the inverter of the photovoltaic power station at each moment during the power-limited period, based on the total number of inverters in the photovoltaic power station, the amount of abandoned photovoltaic power of the photovoltaic power station at each moment during the power-limited period and the total amount of abandoned photovoltaic power of the photovoltaic power station during the power-limited period can be calculated.

[0075] The method for analyzing the blocked power of a photovoltaic power station disclosed in the embodiment of the present application constructs a target relationship between the instantaneous power and irradiation intensity of a model inverter of a photovoltaic power station during a non-power-limited period and the available power of the inverter in the photovoltaic power station. After obtaining the instantaneous power and irradiation intensity of the model inverter during the power-limited period, the available power of each inverter of the photovoltaic power station at each moment during the power-limited period can be calculated based on the target relationship. Then, based on the available power and the active power of the inverter of the photovoltaic power station during the power-limited period, the abandoned photovoltaic power of the photovoltaic power station during the power-limited period is calculated. This calculation method is not affected by the simultaneity rate of the actual output of the photovoltaic power station, thereby improving the accuracy of the calculation result of the abandoned photovoltaic power.

[0076] In this embodiment, see Figure 2 In the above solution disclosed in this embodiment, obtaining the target relationship may include:

[0077] Step S201: obtaining the irradiance intensity of a sample inverter in a photovoltaic power station at each time during a non-power-cutoff period;

[0078] In this step, by monitoring the light intensity information of the sample inverter of the photovoltaic power station, the irradiation intensity of the sample inverter at each moment during the non-power-restricted period can be obtained. Among them, whether the photovoltaic power station is in the power-restricted period can be extracted from the control information of the control system of the photovoltaic power station. For example, in this solution, when judging whether the photovoltaic power station is in the power-restricted period, it can be judged by the data instructions in the control system of the photovoltaic power station. For example, by monitoring a certain control instruction in the control system of the photovoltaic power station, when the control instruction appears or enters a certain calibration state or meets a certain preset condition, it can be indicated that the photovoltaic power station has entered the power-restricted period. Otherwise, it indicates that the photovoltaic power station is in the non-power-restricted period. At this time, the power-restricted period of the photovoltaic power station can be determined.

[0079] Step S202: Calculate the instantaneous power of the sample inverter in the photovoltaic power station at each moment during the non-power-cutoff period.

[0080] In this scheme, after obtaining the irradiation intensity of the model inverter at each moment during the non-power-limited period, based on the irradiation intensity of the model inverter at each moment and the relevant configuration parameters of the model inverter, the instantaneous power of the model inverter in the photovoltaic power station at each moment during the non-power-limited period can be calculated.

[0081] Step S203: Calculate the average available power of each inverter of the photovoltaic power station at each time during the non-power-cutoff period.

[0082] In this step, the available power of each inverter can be measured by directly measuring the output of the inverter, and then the average available power of each inverter of the photovoltaic power station at each moment during the non-power-limited period can be calculated by averaging the output power of each inverter of the photovoltaic power station during the non-power-limited period. It should be noted again that the inverters of the photovoltaic power station still refer to the inverters of the same model as the sample inverter in the photovoltaic power station.

[0083] Step S204: taking the instantaneous power at each moment and the irradiation intensity at each moment as features, taking the average available power at each moment as a target value, linearly fitting the instantaneous power, irradiation intensity and average available power to obtain a target relationship.

[0084] When performing linear fitting, a linear regression model may be used to perform linear fitting on the instantaneous power, irradiation intensity and average available power. For the specific fitting process, reference may be made to the prior art.

[0085] In the technical solution disclosed in the embodiment of the present application, the number and distribution of the model inverters can be selected according to the design requirements. For example, in the present solution, the number of the model inverters is N, and N can be a positive integer greater than 1. At this time, the instantaneous power of the model inverter and the irradiation intensity of the model inverter in the aforementioned solution can refer to the average instantaneous power and average irradiation intensity of these model inverters. That is, in the above solution, calculating the instantaneous power of the model inverters in the photovoltaic power station at each moment during the non-power-restricted period can specifically include: based on the irradiation intensity and related parameters of the N model inverters in the photovoltaic power station at each moment during the non-power-restricted period, calculating the instantaneous power of the N model inverters in the photovoltaic power station at each moment during the non-power-restricted period, wherein N is a positive integer not less than 2; performing mean calculation on the instantaneous powers of the N model inverters at the same moment to obtain the average instantaneous power of the model inverter at each moment, and using the average instantaneous power as the instantaneous power of the model inverter at each moment. Similarly, the irradiance intensity of the model inverter in the photovoltaic power station during the non-power-limited period at each moment is obtained, specifically, the irradiance intensity of N model inverters in the photovoltaic power station during the non-power-limited period at each moment is obtained, and the average irradiance intensity of the N model inverters at the same moment is calculated to obtain the irradiance intensity of the model inverter of the photovoltaic power station during the non-power-limited period at each moment.

[0086] When the number of the model inverters is N, the instantaneous power and irradiation intensity of all the model inverters during the power-limited period can be substituted into the target relationship. At this time, the available power of the inverters of the N photovoltaic power stations at each moment can be calculated. At this time, the average of the N available powers at the same moment can be calculated to obtain the average active power of the model inverters at each moment during the power-limited period. The abandoned photovoltaic power is calculated based on the average active power. For details, see Figure 3 In the above scheme, based on the instantaneous power, irradiation intensity and target relationship of the model inverter during the power-limited period, the available power of the inverter of the photovoltaic power station at each moment during the power-limited period is calculated; based on the available power of the photovoltaic power station at each moment during the power-limited period and the active power of the photovoltaic power station at each moment during the power-limited period, the amount of abandoned photovoltaic power in the photovoltaic power station during the power-limited period is calculated, including:

[0087] Step S301: Substitute the instantaneous power and irradiation intensity of each model inverter in the power-limited period into the target relationship to calculate the active power of each model inverter in each power-limited period.

[0088] For example, during the power-limited period, the instantaneous power and irradiation intensity of the model inverter A1 are substituted into the target relationship to calculate the active power a1; the instantaneous power and irradiation intensity of the model inverter A2 are substituted into the target relationship to calculate the active power a2; and so on; the instantaneous power and irradiation intensity of the model inverter AN are substituted into the target relationship to calculate the active power aN.

[0089] Step S302: performing mean calculation on the calculated active powers of the various model inverters at the same time, to obtain the average active powers of the model inverters at various times during the power-limited period.

[0090] By calculating the mean of a1, a2, ..., aN at the same moment, the average active power at the same moment can be calculated.

[0091] Step S303: obtaining the actual power generated by each inverter at each time during the power-limited period.

[0092] In this step, the actual power of each inverter of the photovoltaic power station during the power-limited period can be directly obtained through the photovoltaic system. The actual power refers to the actual output power of the inverter. For example, if there are X inverters in the photovoltaic power station, X actual powers will be obtained at this time.

[0093] Step S304: Calculate the average of the actual power generated at each moment to obtain the average actual power generated by the inverter at each moment during the power-limited period.

[0094] In this step, after obtaining the X actual power outputs, the average value of the X actual power outputs is calculated, and the average actual power output of the inverter at each moment in the photovoltaic power station during the power restriction period can be obtained.

[0095] Step S305: Based on the average active power, the average actual power and the total number of inverters, the amount of abandoned photovoltaic power in the photovoltaic power station during the power-limited period is calculated.

[0096] After determining the average active power and the average actual power, the difference between the average active power corresponding to each moment and the average actual power is used, which is the abandoned light power corresponding to each inverter at each moment in the power-limited period. The abandoned light power corresponding to each moment in the power-limited period is accumulated to calculate the total abandoned light power of an inverter in the power-limited period. Then, the abandoned light power is multiplied by the total number of inverters to calculate the total abandoned light power of this type of inverter in the photovoltaic power station. Then, the above scheme is used to calculate the total abandoned light power of each type of inverter in the photovoltaic power station. The total abandoned light power of each type of inverter is counted to obtain the total abandoned light power of the photovoltaic power station in the power-limited period. After the abandoned light power is calculated, a report can be constructed based on the abandoned light power and other data (such as the available power of the inverter, the actual power, the available power of the photovoltaic power station, the actual power, etc.) so that the user can understand the working condition of the photovoltaic power station more clearly.

[0097] Furthermore, after determining the amount of abandoned photovoltaic power of the photovoltaic power station, the abandoned photovoltaic power can be further judged to determine whether there is any abnormality in the photovoltaic power station. For example, it can be determined whether the abandoned photovoltaic power is greater than a pre-marked photovoltaic power threshold. If it is greater than the threshold, it indicates that there is an abnormality in the photovoltaic power station system. At this time, the photovoltaic power station control system can generate an alarm signal to notify the operation and maintenance personnel to troubleshoot the photovoltaic power station.

[0098] In the technical solution disclosed in this embodiment, considering that it is difficult for some photovoltaic power station systems to mark whether the photovoltaic power station has entered the power-limited period, the present application can also mark the start and end times of the power-limited period by the ratio of the active power of the photovoltaic power station to the given power, and use the time period composed of the start and end times as the power-limited period. Specifically, the process may include:

[0099] Step S401: Calculate the ratio of the active power of the photovoltaic power station at the current moment to the given power.

[0100] The given power may be a pre-marked power, and the active power may refer to the total output power of the photovoltaic power station (including any type of inverter), which may be calculated by the AGC system (automatic active power control system) of the photovoltaic power station.

[0101] Step S402: Determine whether the ratio is greater than a preset ratio.

[0102] The preset ratio can be a pre-marked ratio. When the ratio of the active power to the given power is greater than the ratio, it indicates that the photovoltaic power station is in a power-limited period at the current moment; when the ratio of the active power to the given power is not greater than the ratio, it indicates that the photovoltaic power station is in a non-power-limited period at the current moment.

[0103] Step S403: If the ratio corresponding to the current moment is greater than the preset ratio, determine whether the ratio corresponding to the previous moment is less than the preset ratio.

[0104] In this step, if the ratio corresponding to the current moment is greater than the preset ratio, it can be determined that the photovoltaic power station is in a power-limited period, but whether this moment is the starting moment of the power-limited period is uncertain, so further judgment is required.

[0105] Step S404: if the ratio corresponding to the previous moment is not greater than the preset ratio, the current moment is marked as the starting moment of the power-limited period.

[0106] If the ratio corresponding to the current moment is greater than the preset ratio, but the ratio corresponding to the previous moment is not greater than the preset ratio, the current moment is marked as the starting moment of the power-limited period. If the ratio corresponding to the previous moment is also greater than the preset ratio, it indicates that the current moment is a moment in the middle of the power-limited period.

[0107] Step S405: If the ratio corresponding to the current moment is not greater than the preset ratio, determine whether the ratio corresponding to the previous moment is greater than the preset ratio.

[0108] If the ratio corresponding to the current moment is not greater than the preset ratio, it indicates that the photovoltaic power station is in a non-power-limited period, but whether this moment is the end time of the power-limited period is uncertain, so further judgment is required.

[0109] Step S406: If the ratio corresponding to the previous moment is greater than the preset ratio, the current moment is marked as the end moment of the power-limited period.

[0110] If the ratio corresponding to the current moment is not greater than the preset ratio, but the ratio corresponding to the previous moment is greater than the preset ratio, the current moment is marked as the end moment of the power-limited period. If the ratio corresponding to the previous moment is also not greater than the preset ratio, it indicates that the current moment is a moment in the middle of the non-power-limited period.

[0111] In actual scenarios, if the ratio does not exceed the preset ratio in a certain time period (a day), it indicates that the photovoltaic power station has not implemented power rationing during this period, and the amount of abandoned photovoltaic power in this period is zero.

[0112] Before obtaining the active power of the photovoltaic power station during the power-cutting period and the irradiation intensity during the power-cutting period, it also includes:

[0113] Based on the preset ratio of available power to active power of the photovoltaic power station at each moment, the start moment and the end moment of the power-restriction period are marked, and the time period formed by the start moment and the end moment is used as the power-restriction period.

[0114] In actual scenarios, there are many devices in a photovoltaic power station. Sometimes, the photovoltaic power station enters the equipment maintenance stage, or the equipment that has been maintained is reconnected to the photovoltaic power station system. If the target relationship is established before some inverters or photovoltaic panels in the photovoltaic power station enter the equipment maintenance stage or are reconnected to the photovoltaic power station system, then the target relationship will not be applicable to the current photovoltaic power station. Therefore, the target system needs to be rebuilt. Therefore, see Figure 5 , the above scheme may also include:

[0115] Step S501: determining whether the photovoltaic power station has a target condition;

[0116] The target condition refers to a situation that affects the change in the output power of the photovoltaic power station, for example, it may include a failure of an inverter or a photovoltaic panel or a successful repair and reconnection to the photovoltaic power station.

[0117] Step S502: if the target situation occurs, the target relationship is updated based on the instantaneous power of the model inverter in the photovoltaic power plant, the irradiation intensity and the available power of the photovoltaic power plant in the non-blackout period after the target situation occurs.

[0118] If the target situation occurs, it is necessary to reconstruct the target relationship based on the instantaneous power and irradiation intensity of the sample inverter in the photovoltaic power station and the available power of the photovoltaic power station collected during the non-power-cutoff period after the target situation occurs.

[0119] This embodiment discloses a photovoltaic power station obstruction electricity analysis device. For the specific working contents of each unit in the device, please refer to the contents of the above method embodiment.

[0120] The following describes a photovoltaic power station obstructed electricity analysis device provided by an embodiment of the present invention. The photovoltaic power station obstructed electricity analysis device described below and the photovoltaic power station obstructed electricity analysis method described above can be referred to each other.

[0121] See also Figure 6The photovoltaic power station obstructed electricity quantity analysis device may include:

[0122] The association relationship acquisition unit 10 is used to acquire a target relationship, wherein the target relationship is used to characterize at least a mapping relationship between the instantaneous power and irradiation intensity of the sample inverter in the photovoltaic power station during the non-power-cutoff period and the available power of the inverter of the photovoltaic power station;

[0123] The power-limiting parameter acquisition unit 20 is used to obtain the instantaneous power and irradiation intensity of the sample inverter during the power-limiting period;

[0124] The available power calculation unit 30 is used to calculate the available power of the inverter of the photovoltaic power station at each moment during the power-limited period based on the instantaneous power of the model inverter during the power-limited period, the irradiation intensity and the target relationship;

[0125] The abandoned photovoltaic power calculation unit 40 is used to calculate the abandoned photovoltaic power of the photovoltaic power station during the power-limited period based on the available power of the inverter of the photovoltaic power station at each time during the power-limited period and the active power of the inverter of the photovoltaic power station at each time during the power-limited period.

[0126] The specific implementation of the association relationship acquisition unit 10, the power restriction parameter acquisition unit 20, the available power calculation unit 30, and the abandoned photovoltaic power calculation unit 40 can be found in the above method embodiment, which will not be described again here.

[0127] Figure 7 The hardware structure diagram of the photovoltaic power station obstruction power analysis device provided by the embodiment of the present invention can be applied to the photovoltaic power station control system. Figure 7 As shown, the device may include: at least one processor 100, at least one communication interface 200, at least one memory 300 and at least one communication bus 400;

[0128] In the embodiment of the present invention, the number of the processor 100, the communication interface 200, the memory 300, and the communication bus 400 is at least one, and the processor 100, the communication interface 200, and the memory 300 communicate with each other through the communication bus 400; obviously, Figure 7 The communication connections shown for the processor 100, the communication interface 200, the memory 300, and the communication bus 400 are merely optional;

[0129] Optionally, the communication interface 200 may be an interface of a communication module, such as an interface of a GSM module;

[0130] The processor 100 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention.

[0131] The memory 300 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0132] The processor 100 is specifically configured to:

[0133] Acquire a target relationship, where the target relationship is used to characterize at least a mapping relationship between the instantaneous power and irradiation intensity of a sample inverter in a photovoltaic power station during a non-power-cutoff period and the available power of the inverter of the photovoltaic power station;

[0134] Obtain the instantaneous power and irradiance of the sample inverter during the power-limited period;

[0135] Based on the instantaneous power and irradiation intensity of the sample inverter during the power-limited period and the target relationship, the available power of the inverter of the photovoltaic power station at each moment during the power-limited period is calculated;

[0136] Based on the available power of the inverter of the photovoltaic power station at each moment during the power-limited period and the active power of the inverter of the photovoltaic power station at each moment during the power-limited period, the amount of abandoned photovoltaic power in the photovoltaic power station during the power-limited period is calculated.

[0137] The processor is also used to implement various steps of other embodiments of the above-mentioned photovoltaic power station blocked electricity analysis method, which will not be repeated here.

[0138] For the convenience of description, the above system is described as being divided into various modules according to their functions. Of course, when implementing the present invention, the functions of each module can be implemented in the same or multiple software and / or hardware.

[0139] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can refer to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. The system and system embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without creative work.

[0140] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0141] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0142] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0143] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for analyzing the obstructed electricity of a photovoltaic power station, characterized in that: include: Acquire a target relationship, where the target relationship is used to characterize at least a mapping relationship between the instantaneous power and irradiation intensity of a sample inverter in a photovoltaic power station during a non-power-cutoff period and the available power of the inverter of the photovoltaic power station; Obtain the instantaneous power and irradiance of the sample inverter during the power-limited period; Based on the instantaneous power and irradiation intensity of the sample inverter during the power-limited period and the target relationship, the available power of the inverter of the photovoltaic power station at each moment during the power-limited period is calculated; Based on the available power of the inverter of the photovoltaic power station at each time during the power-limited period and the active power of the inverter of the photovoltaic power station at each time during the power-limited period, the amount of abandoned photovoltaic power in the photovoltaic power station during the power-limited period is calculated; Among them, obtaining the target relationship includes: Obtain the irradiance intensity of the sample inverter in the photovoltaic power station at each time during the non-power-limited period; Calculate the instantaneous power of the sample inverter in the photovoltaic power station at each moment during the non-power-limited period; Calculate the average available power of each inverter of the photovoltaic power station at each time during the non-power-limited period; Taking the instantaneous power at each moment and the irradiation intensity at each moment as features, taking the average available power at each moment as a target value, performing linear fitting on the instantaneous power, irradiation intensity and average available power to obtain a target relationship; Wherein, based on the instantaneous power, irradiation intensity and the target relationship of the model inverter during the power-limited period, the available power of the inverter of the photovoltaic power station at each moment during the power-limited period is calculated; based on the available power of the inverter of the photovoltaic power station at each moment during the power-limited period and the active power of the inverter of the photovoltaic power station at each moment during the power-limited period, the amount of abandoned photovoltaic power in the photovoltaic power station during the power-limited period is calculated, including: Substituting the instantaneous power and irradiation intensity of each model inverter during the power-limited period into the target relationship, and calculating the active power of each model inverter during each power-limited period; The calculated active powers of the various model inverters at the same time are averaged to obtain the average active powers of the model inverters at various times during the power-limited period; Obtain the actual power generated by each inverter at each time during the power-limited period; The actual power generated at each moment is averaged to obtain the average actual power generated by the inverter at each moment during the power-limited period; Based on the average active power, the average actual power and the total number of inverters, the amount of abandoned photovoltaic power in the photovoltaic power station during the power-limited period is calculated.

2. The method for analyzing the obstructed electricity quantity of a photovoltaic power station according to claim 1, characterized in that: Calculate the instantaneous power of the sample inverter in the photovoltaic power station at each moment during the non-power-cutoff period, including: Calculate the instantaneous power of N sample inverters in the photovoltaic power station at each moment during the non-power-limited period, where N is a positive integer not less than 2; The instantaneous powers of N sample inverters at the same time are averaged to obtain the average instantaneous power of the sample inverter at each time, and the average instantaneous power is used as the instantaneous power of the sample inverter at each time.

3. The method for analyzing the obstructed electricity of a photovoltaic power station according to claim 1, characterized in that: Before obtaining the active power of the photovoltaic power station during the power-cutting period and the irradiation intensity during the power-cutting period, it also includes: Based on the ratio of the active power of the photovoltaic power station at each moment to the given power, the start moment and the end moment of the power-restriction period are marked, and the time period formed by the start moment and the end moment is used as the power-restriction period.

4. The method for analyzing the obstructed electricity quantity of a photovoltaic power station according to claim 3, characterized in that: Based on the ratio of the active power of the photovoltaic power station at each time to the given power, the start and end times of the power restriction period are marked, including: Calculate the ratio of the active power of the photovoltaic power station at the current moment to the given power; Determining whether the ratio is greater than a preset ratio; If the ratio corresponding to the current moment is greater than the preset ratio, determine whether the ratio corresponding to the previous moment is less than the preset ratio; If the ratio corresponding to the previous moment is not greater than the preset ratio, marking the current moment as the starting moment of the power-limited period; If the ratio corresponding to the current moment is not greater than the preset ratio, determine whether the ratio corresponding to the previous moment is greater than the preset ratio; If the ratio corresponding to the previous moment is greater than the preset ratio, the current moment is marked as the end moment of the power-limited period.

5. The method for analyzing the obstructed electricity quantity of a photovoltaic power station according to claim 1, characterized in that: Also includes: Determining whether a target condition occurs in the photovoltaic power station, wherein the target condition refers to a condition that affects a change in output power of the photovoltaic power station; If the target situation occurs, the target relationship is updated based on the instantaneous power of the model inverter in the photovoltaic power plant, the irradiation intensity, and the available power of the photovoltaic power plant during the non-blackout period after the target situation occurs.

6. The method for analyzing the obstructed electricity quantity of a photovoltaic power station according to claim 1, characterized in that: After calculating the amount of abandoned photovoltaic power in the power-limited period, it also includes: It is determined whether the amount of abandoned photovoltaic power is greater than a pre-marked threshold for the amount of abandoned photovoltaic power. If the amount of abandoned photovoltaic power is greater than the threshold for the amount of abandoned photovoltaic power, an alarm signal is generated.

7. A photovoltaic power station obstruction power analysis device, characterized in that: include: An association relationship acquisition unit, used to acquire a target relationship, wherein the target relationship is used to characterize at least a mapping relationship between the instantaneous power and irradiation intensity of a sample inverter in a photovoltaic power station during a non-power-cutoff period and the available power of the inverter of the photovoltaic power station; A power-limiting parameter acquisition unit is used to obtain the instantaneous power and radiation intensity of the sample inverter during the power-limiting period; An available power calculation unit, configured to calculate the available power of the inverter of the photovoltaic power station at each moment during the power-limited period based on the instantaneous power of the model inverter during the power-limited period, the irradiation intensity and the target relationship; A photovoltaic power abandonment calculation unit, used to calculate the photovoltaic power abandonment of the photovoltaic power station during the power-limited period based on the available power of the inverter of the photovoltaic power station at each time during the power-limited period and the active power of the inverter of the photovoltaic power station at each time during the power-limited period; The association relationship acquisition unit acquires the target relationship specifically for: Obtain the irradiance intensity of the sample inverter in the photovoltaic power station at each time during the non-power-limited period; Calculate the instantaneous power of the sample inverter in the photovoltaic power station at each moment during the non-power-limited period; Calculate the average available power of each inverter of the photovoltaic power station at each time during the non-power-limited period; Taking the instantaneous power at each moment and the irradiation intensity at each moment as features, taking the average available power at each moment as a target value, performing linear fitting on the instantaneous power, irradiation intensity and average available power to obtain a target relationship; Wherein, based on the instantaneous power, irradiation intensity and the target relationship of the model inverter during the power-limited period, the available power of the inverter of the photovoltaic power station at each moment during the power-limited period is calculated; based on the available power of the inverter of the photovoltaic power station at each moment during the power-limited period and the active power of the inverter of the photovoltaic power station at each moment during the power-limited period, the amount of abandoned photovoltaic power in the photovoltaic power station during the power-limited period is calculated, including: Substituting the instantaneous power and irradiation intensity of each model inverter during the power-limited period into the target relationship, and calculating the active power of each model inverter during each power-limited period; The calculated active powers of the various model inverters at the same time are averaged to obtain the average active powers of the model inverters at various times during the power-limited period; Obtain the actual power generated by each inverter at each time during the power-limited period; The actual power generated at each moment is averaged to obtain the average actual power generated by the inverter at each moment during the power-limited period; Based on the average active power, the average actual power and the total number of inverters, the amount of abandoned photovoltaic power in the photovoltaic power station during the power-limited period is calculated.

8. A photovoltaic power station obstruction power analysis device, characterized in that: include: Memory and processor; The memory stores a program suitable for execution by the processor, wherein the program is used to: Obtain a target relationship, wherein the target relationship is at least used to characterize a mapping relationship between the instantaneous power and irradiation intensity of a model inverter in a photovoltaic power station during a non-power-limited period and the available power of the inverter of the photovoltaic power station; wherein obtaining the target relationship comprises: obtaining the irradiation intensity of the model inverter in the photovoltaic power station at each moment during the non-power-limited period; calculating the instantaneous power of the model inverter in the photovoltaic power station at each moment during the non-power-limited period; calculating the average available power of each inverter of the photovoltaic power station at each moment during the non-power-limited period; using the instantaneous power at each moment and the irradiation intensity at each moment as features, and using the average available power at each moment as a target value, linearly fitting the instantaneous power, irradiation intensity and average available power to obtain the target relationship; Obtain the instantaneous power and irradiance of the sample inverter during the power-limited period; Based on the instantaneous power and irradiation intensity of the sample inverter during the power-limited period and the target relationship, the available power of the inverter of the photovoltaic power station at each moment during the power-limited period is calculated; Based on the available power of the inverter of the photovoltaic power station at each time during the power-limited period and the active power of the inverter of the photovoltaic power station at each time during the power-limited period, the amount of abandoned photovoltaic power in the photovoltaic power station during the power-limited period is calculated; Wherein, based on the instantaneous power, irradiation intensity and the target relationship of the model inverter during the power-limited period, the available power of the inverter of the photovoltaic power station at each moment during the power-limited period is calculated; based on the available power of the inverter of the photovoltaic power station at each moment during the power-limited period and the active power of the inverter of the photovoltaic power station at each moment during the power-limited period, the amount of abandoned photovoltaic power in the photovoltaic power station during the power-limited period is calculated, including: Substituting the instantaneous power and irradiation intensity of each model inverter during the power-limited period into the target relationship, and calculating the active power of each model inverter during each power-limited period; The calculated active powers of the various model inverters at the same time are averaged to obtain the average active powers of the model inverters at various times during the power-limited period; Obtain the actual power generated by each inverter at each time during the power-limited period; The actual power generated at each moment is averaged to obtain the average actual power generated by the inverter at each moment during the power-limited period; Based on the average active power, the average actual power and the total number of inverters, the amount of abandoned photovoltaic power in the photovoltaic power station during the power-limited period is calculated.

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