A method and system for analyzing the time sequence matching degree of a photovoltaic power station and an electric power load

Abstract

The application discloses a photovoltaic power station and power load time sequence matching degree analysis method and system, comprising: based on the same time interval, obtaining photovoltaic data and load data in the calculation area in time sequence; based on the photovoltaic data and load data, obtaining the annual cumulative power generation of the photovoltaic power station, the annual cumulative power consumption of the power load, and the annual matching power generation and power consumption of the photovoltaic power station output and the power load; based on the annual cumulative power generation of all photovoltaic power stations, the annual cumulative power consumption of the power load, and the annual matching power generation and power consumption, the time sequence matching degree of the photovoltaic power station output and the power load is calculated. The application provides a basis for the site selection and capacity determination of the photovoltaic power station, measures the matching degree of the power generation output of the photovoltaic power station and the power load in time sequence through long-time statistical data analysis, and provides basic support for the site selection, capacity determination and other planning scheme formulation of the distributed photovoltaic.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic power generation, and in particular to a method and system for analyzing the timing matching between a photovoltaic power station and an electric load. Background Art

[0002] With the global energy crisis, countries are increasingly prioritizing photovoltaic power generation. This has led to the rapid development of distributed photovoltaic power generation and a rapid increase in installed capacity. In some countries, photovoltaic power generation has become a key source of power. For example, according to statistics from the National Energy Administration, by the end of 2017, China's installed photovoltaic power generation capacity reached 130 million kilowatts, including 100.59 million kilowatts of photovoltaic power stations and 29.66 million kilowatts of distributed photovoltaic power generation.

[0003] Distributed photovoltaic power stations are characterized by their low voltage levels of 220V-10kV, distributed across a wide area and with small individual power supply capacity. The large-scale integration of distributed photovoltaic power will alter the traditional radial nature of the distribution network, transforming the flow of energy in the regional grid from a single direction to a bidirectional one, resulting in reverse power flow during periods of low load. When a high proportion of distributed photovoltaic power is connected to the grid, the grid will experience fluctuations, randomness, and other uncertainties, as photovoltaic power stations are subject to weather factors. Severe power fluctuations can lead to voltage fluctuations, reduced power quality, and frequent power flow fluctuations, posing challenges to the local consumption of photovoltaic power.

[0004] In order to analyze the power and electricity balance characteristics of the regional power grid and improve the absorption level of distributed photovoltaics, it is urgent to study the matching degree between photovoltaic power stations and loads. Summary of the Invention

[0005] To address the aforementioned shortcomings of the existing technology, the present invention provides a method and system for analyzing the temporal matching between photovoltaic power plants and power loads. Since both photovoltaic power plant output and power load are time-series data, temporal matching analysis can be used to understand the characteristics of power generation and consumption, providing fundamental support for planning solutions such as site selection and capacity determination for distributed photovoltaic systems.

[0006] The present invention provides a method for analyzing the timing matching degree between a photovoltaic power station and an electric load, comprising:

[0007] Acquire photovoltaic data and load data within the calculation area in a time series based on the same time interval;

[0008] Based on the photovoltaic data and load data, obtain the cumulative power generation of the photovoltaic power station throughout the year, the cumulative power consumption of the power load throughout the year, and the matching power generation and matching power consumption of the photovoltaic power station output and power load throughout the year;

[0009] The timing matching degree between the output of the photovoltaic power station and the power load is calculated based on the cumulative power generation of all the photovoltaic power stations throughout the year, the cumulative power consumption of the power load throughout the year, and the matching power generation and power consumption throughout the year.

[0010] Preferably, the step of obtaining the annual cumulative power generation of the photovoltaic power station, the annual cumulative power consumption of the power load, and the annual matching power generation and matching power consumption of the photovoltaic power station output and the power load based on the photovoltaic data and load data includes:

[0011] Based on the photovoltaic data, obtaining a daily power generation range of the photovoltaic power station and an annual active power output curve of the photovoltaic power station;

[0012] Calculating the cumulative power generation of the photovoltaic power station throughout the year based on the daily power generation interval of the photovoltaic power station and the annual active power output curve of the photovoltaic power station;

[0013] Calculating the annual cumulative power consumption of the power load based on the load data;

[0014] Based on the daily power generation range of the photovoltaic power station, the annual active power output curve of the photovoltaic power station and the set daily matching threshold coefficient between the photovoltaic power station output and the power load, the annual matching power generation and matching power consumption of the photovoltaic power station output and the power load are calculated.

[0015] Preferably, obtaining the daily power generation interval of the photovoltaic power station and the annual active power output curve of the photovoltaic power station based on the photovoltaic data includes:

[0016] Convert the power output value of each sample photovoltaic power station in the calculation area into per-unit value;

[0017] Based on the per-unit power output of each sample PV power station, the average active power output of the PV power station at the same time is calculated to obtain the estimated active power output of all PV power stations in the per-unit system.

[0018] Draw the annual active output curve of the photovoltaic power stations in the calculation area based on the estimated active output values ​​of all sample photovoltaic power stations;

[0019] Based on the daily power generation start time and power generation end time of the photovoltaic power station, obtaining the daily power generation interval of the photovoltaic power station;

[0020] The power generation start time is the time when the active output of the photovoltaic power station exceeds the threshold value for the first time; the power generation end time is the time when the active output of the photovoltaic power station exceeds the threshold value for the last time.

[0021] Preferably, the calculating of the annual cumulative power generation of the photovoltaic power station based on the daily power generation interval of the photovoltaic power station and the annual active power output curve of the photovoltaic power station includes:

[0022] Calculate the daily cumulative power generation of all photovoltaic power stations in the region within the daily power generation interval of the photovoltaic power station based on the annual active power output curve of the photovoltaic power station;

[0023] The cumulative power generation of all photovoltaic power stations in the region throughout the year is calculated based on the cumulative power generation of all photovoltaic power stations in the region every day.

[0024] Preferably, the calculating of the annual cumulative power consumption of the power load based on the load data includes:

[0025] Calculate the daily cumulative power consumption of the power load in the region based on the daily active power value of the power load in the region during the daily power generation interval of the photovoltaic power station;

[0026] Based on the daily cumulative power consumption of the power load in the region, the annual cumulative power consumption of the power load in the region is calculated.

[0027] Preferably, the calculation of the annual matching power generation and power consumption of the photovoltaic power station output and the power load based on the daily power generation interval of the photovoltaic power station, the annual active power output curve of the photovoltaic power station, and the set daily matching threshold coefficient between the photovoltaic power station output and the power load includes:

[0028] Calculate, within the daily power generation interval of the photovoltaic power station, the daily matching power generation power and the matching power consumption of the photovoltaic power station output and the power load in the region at each moment based on the annual active power output curve of the photovoltaic power station and the daily matching threshold coefficient between the photovoltaic power station output and the power load;

[0029] Based on the daily matching power generation and power consumption of the PV power station output and power load in the region at each moment, calculate the daily matching power generation and power consumption of the PV power station output and power load in the region;

[0030] Based on the daily matching power generation and matching power consumption of the photovoltaic power station output and the power load in the region, the annual matching power generation and matching power consumption of the photovoltaic power station output and the power load in the region are calculated.

[0031] Preferably, the matching power generation between the output of the photovoltaic power station and the power load in the region at each moment is calculated as follows:

[0032]

[0033] Where: P matchPV,d,t : The matching power generation of the photovoltaic power station output and the power load in the region at time t on day d; P PVN : total installed capacity of all photovoltaic power stations in the region; P PV,d,t* : estimated active power output of the PV power station in the region under the per-unit system; PL,d,t : active power load value in the region at time t on the dth day; ε match : The daily matching threshold coefficient between the output of the photovoltaic power station and the power load; S N : Rated capacity of the lines or substations in the area;

[0034] The matching power consumption of the photovoltaic power station output and the power load in the area at each moment is calculated as follows:

[0035]

[0036] Where: P matchL,d,t : The power consumption matching the output of the photovoltaic power station and the power load in the region at time t on day d.

[0037] Preferably, the timing matching degree between the output of the photovoltaic power station and the power load is calculated as follows:

[0038]

[0039] Where: K match : The timing matching degree between the output of photovoltaic power station and power load; E matchPV : The annual matching power generation of the photovoltaic power station output and power load in the region; E matchL : The annual matching power consumption of the photovoltaic power station output and power load in the region; E PV : The cumulative power generation of all photovoltaic power stations in the region throughout the year; E L : The cumulative electricity consumption of the power load in the region throughout the year.

[0040] Preferably, the step of acquiring photovoltaic data and load data within the calculation area in a time series based on the same time interval includes:

[0041] Based on the calculation area, multiple photovoltaic power stations in the calculation area are selected as sample photovoltaic power stations, and historical power output data of the sample photovoltaic power stations for a full year and historical power load data of the calculation area for a full year are collected;

[0042] Abnormal data that exceeds a set range is eliminated from the historical power generation output data and the historical power load data.

[0043] Based on the same inventive concept, the present invention also provides a system for analyzing the timing matching between a photovoltaic power station and a power load, comprising:

[0044] An acquisition module is used to acquire photovoltaic data and load data within the calculation area in a time series based on the same time interval;

[0045] An intermediate calculation module is used to obtain the annual cumulative power generation of the photovoltaic power station, the annual cumulative power consumption of the power load, and the annual matching power generation and matching power consumption of the photovoltaic power station output and the power load based on the photovoltaic data and load data;

[0046] The timing matching calculation module is used to calculate the timing matching between the photovoltaic power station output and the power load based on the cumulative power generation of all photovoltaic power stations throughout the year, the cumulative power consumption of the power load throughout the year, and the matching power generation and power consumption throughout the year.

[0047] Preferably, the intermediate calculation module includes:

[0048] A photovoltaic data processing unit, configured to obtain a daily power generation interval of the photovoltaic power station and an annual active power output curve of the photovoltaic power station based on the photovoltaic data;

[0049] a photovoltaic power generation calculation unit, configured to calculate the cumulative power generation of the photovoltaic power station throughout the year based on the daily power generation interval of the photovoltaic power station and the annual active power output curve of the photovoltaic power station;

[0050] A load power consumption calculation unit, configured to calculate the annual cumulative power consumption of the power load based on the load data;

[0051] The matching power consumption calculation unit is used to calculate the annual matching power generation and matching power consumption of the photovoltaic power station output and the power load based on the daily power generation range of the photovoltaic power station, the annual active power output curve of the photovoltaic power station and the set daily matching threshold coefficient between the photovoltaic power station output and the power load.

[0052] Compared with the prior art, the present invention has the following beneficial effects:

[0053] The technical solution provided by the present invention obtains photovoltaic data and load data in a calculation area in a time series based on the same time interval; based on the photovoltaic data and load data, obtains the annual cumulative power generation of the photovoltaic power station, the annual cumulative power consumption of the power load, and the annual matching power generation and matching power consumption of the photovoltaic power station output and the power load; based on the annual cumulative power generation of all photovoltaic power stations, the annual cumulative power consumption of the power load, and the annual matching power generation and power consumption, calculates the time series matching degree of the photovoltaic power station output and the power load. The concept of the present invention provides a basis for the site selection and sizing of photovoltaic power stations. Through long-term statistical data analysis, the characteristic indicator of time series matching is used to measure the degree of time series matching between the power output of the photovoltaic power station and the power load, providing basic support for the formulation of planning schemes such as site selection and sizing of distributed photovoltaics.

[0054] The technical solution provided by the present invention has the advantages of clear process, easy data source and convenient calculation, and is suitable for distributed photovoltaic access to distribution networks with many points and wide coverage. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 Flowchart of the method for analyzing the timing matching degree between a photovoltaic power station and power loads in an embodiment.

[0056] Figure 2 Detailed flow chart of the method for analyzing the timing matching degree between a photovoltaic power station and power loads in the embodiment.

[0057] Figure 3 : is the per-unit active power output curve of the photovoltaic power station throughout the year in the embodiment.

[0058] Figure 4 It is the historical curve of the power load throughout the year in the embodiment. DETAILED DESCRIPTION

[0059] In order to better understand the present invention, the present invention is further described below with reference to the accompanying drawings and examples.

[0060] Example 1

[0061] like Figure 1 As shown, the present invention provides a method for analyzing the timing matching degree between a photovoltaic power station and a power load, comprising:

[0062] Step S1, acquiring photovoltaic data and load data within the calculation area in a time series based on the same time interval;

[0063] Step S2: Based on the photovoltaic data and load data, obtain the annual cumulative power generation of the photovoltaic power station, the annual cumulative power consumption of the power load, and the annual matching power generation and matching power consumption of the photovoltaic power station output and the power load;

[0064] Step S3: Calculate the timing matching degree between the output of the photovoltaic power station and the power load based on the cumulative power generation of all photovoltaic power stations throughout the year, the cumulative power consumption of the power load throughout the year, and the matching power generation and power consumption throughout the year.

[0065] Step S1, acquiring photovoltaic data and load data within the calculation area in a time series based on the same time interval, includes the following steps:

[0066] Calculate the per-unit value of historical power generation output data for sample PV plants in the region. Select n PV plants within the access area as sample plants. Collect historical power generation output data for a full year (365 days) for each sample plant, and remove any abnormal data.

[0067] Collect historical power load data for the region. Select the historical power load for a full 365-day period in the region and remove any abnormal data.

[0068] The time interval of power load data must be consistent with the time interval of PV power station power generation data.

[0069] In this embodiment, there may be 10 photovoltaic power stations in an area, but the workload of collecting data from all 10 power stations is too large, so only data from 1-2 sample power stations need to be collected, and the data from the sample power stations are converted into per-unit values, which are multiplied by the total capacity of the 10 power stations as the estimated output value of all power stations.

[0070] Abnormal data refers to data that exceeds common knowledge in the field. For example, for a power station with an installed capacity of 10MW, if the output reaches 20MW, it is abnormal data, or if the output is a positive value, it is also abnormal data.

[0071] Step S2: Based on the photovoltaic data and load data, obtaining the annual cumulative power generation of the photovoltaic power station, the annual cumulative power consumption of the power load, and the annual matching power generation and matching power consumption of the photovoltaic power station output and the power load, including the following steps:

[0072] Step 1: The typical value range of the time interval dt of the power output data is 1 to 15 minutes. Take the rated installed capacity as the reference value and convert the nominal value of the power output of the photovoltaic power station into the per-unit value. The calculation formula is:

[0073]

[0074] Among them, P PVi,d,t is the nominal active output value of the i-th sample photovoltaic power station at time t on the d-th day, P PVi,d,t* is the per-unit active output value of the i-th sample photovoltaic power station at time t on the d-th day under the per-unit system, P PVNi is the rated installed capacity of the i-th sample PV power station, i = 1, 2, 3, …, n, d = 1, 2, 3, …, 365.

[0075] Step 2: Calculate the annual active power output curve of the PV power stations in the region. Calculate the average active power output of n PV power stations at the same time to obtain the estimated active power output of the PV power stations in the region in the per-unit system. The calculation formula is:

[0076]

[0077] Where n is the number of sample photovoltaic power stations, P PV,d,t* It is the estimated active power output of the PV power station in the region under the per-unit system.

[0078] Step 3: Calculate the starting time t of the photovoltaic power station every day start and the end time of power generation t end , get the daily power generation time interval t of the photovoltaic power station PVAccording to the estimated output data of the photovoltaic power station, the active output of the power station P PV,d,t* The moment when the active output of the power station is greater than ε1 for the first time is the start time of power generation, and the moment when the active output of the power station is greater than ε1 for the last time is the end time of power generation. ε1 is determined based on the original data of the power station, and the typical value range of ε1 is 0~0.05pu. The power generation time interval of the photovoltaic power station is t PV The time interval from the start of power generation to the end of power generation [t start ,t end ].

[0079] Step 4: In the photovoltaic power station power generation interval t PV The daily cumulative power generation of all photovoltaic power stations in the area is calculated using the following formula:

[0080]

[0081] Among them, E PV,d is the cumulative power generation of the photovoltaic power station on day d, t d,start is the time when the photovoltaic power station starts generating electricity on the dth day, t d,end is the time when the photovoltaic power station ends power generation on the dth day, P PVN It is the total installed capacity of all photovoltaic power stations in the region.

[0082] Step 5: In the photovoltaic power station power generation interval t PV The cumulative power generation of all photovoltaic power stations in the region for 365 days a year is calculated using the following formula:

[0083]

[0084] Among them, E PV It is the cumulative power generation of all photovoltaic power stations in the region for 365 days a year.

[0085] Step 6: In the photovoltaic power station power generation interval t PV The daily cumulative power consumption of the power load in the area is calculated using the following formula:

[0086]

[0087] Among them, E L,d P is the cumulative power consumption of the power load in the region on the dth day. L,d,t is the active power load value in the region at time t on the dth day.

[0088] Step 7: In the photovoltaic power station power generation interval t PV The annual cumulative power consumption of the power load in the area is calculated using the following formula:

[0089]

[0090] Among them, E L It is the annual cumulative electricity consumption of the power load in the region.

[0091] Step 8: In the photovoltaic power station power generation interval t PV The matching power generation and power consumption of the photovoltaic power station output and power load in the region at each moment are calculated. The calculation formula is:

[0092]

[0093]

[0094] Among them, P matchPV,d,t P is the matching power generation power of the photovoltaic power station output and power load in the region at time t on day d, matchL,d,t is the power consumption of the photovoltaic power station output and power load in the region at time t on day d, S N is the rated capacity of the line or substation in the area. match It is the daily matching threshold coefficient between the output of the photovoltaic power station and the power load, with a typical value range of 10% to 30%.

[0095] When the absolute value of the deviation between the output of the photovoltaic power station in the region and the power load is less than or equal to ε match S N When the output of the photovoltaic power station matches the power load, the matching power generation power is equal to the output of the photovoltaic power station, and the matching power consumption power is equal to the power load power; when the absolute value of the deviation between the output of the photovoltaic power station and the power load in the region is greater than ε match S N When , it is considered that the output of the photovoltaic power station does not match the power load, and the matching power generation power and the matching power consumption power are both equal to 0.

[0096] Step 9: In the photovoltaic power station power generation interval t PV The daily matching power generation and power consumption of the photovoltaic power station output and power load in the area are calculated using the following formula:

[0097]

[0098]

[0099] Among them, E matchPV,d is the power generation of the photovoltaic power station in the region on day d, which matches the power load throughout the day. matchL,d It is the electricity consumption of the whole day matching the output of the photovoltaic power station and the power load in the region on day d.

[0100] Step 10: In the photovoltaic power station power generation interval t PVThe annual matching power generation and power consumption of the photovoltaic power station output and power load in the region are calculated using the following formula:

[0101]

[0102]

[0103] Among them, E matchPV,d The annual matching power generation of the photovoltaic power station output and power load in the region, E matchL,d To match the output of photovoltaic power stations in the region with the power load throughout the year.

[0104] Step S3: Based on the cumulative power generation of all photovoltaic power stations throughout the year, the cumulative power consumption of the power load throughout the year, and the matching power generation and power consumption throughout the year, the timing matching degree between the output of the photovoltaic power station and the power load is calculated as follows:

[0105]

[0106] Example 2

[0107] like Figure 2 As shown, this embodiment takes a full year of 365 days as an example, and performs analysis based on a timing matching analysis method for a photovoltaic power station and a power load provided by the present invention, including the following steps:

[0108] Step 1: Calculate the per-unit value of the historical power output data of the sample PV power stations in the region. Select two PV power stations connected to the regional power grid as sample power stations. Collect the historical power output data of the sample power stations for a full year of 365 days and remove abnormal data. The time interval dt of the power output data is set to 5 minutes. Take the rated installed capacity as the benchmark value and convert the nominal power output value of the PV power station into the per-unit value. The calculation formula is:

[0109]

[0110] Among them, P PVi,d,t is the nominal active output value of the i-th sample photovoltaic power station at time t on the d-th day, P PVi,d,t* is the per-unit active output value of the i-th sample photovoltaic power station at time t on the d-th day under the per-unit system, P PVNi is the rated installed capacity of the i-th sample PV power station, i = 1, 2, d = 1, 2, 3, …, 365.

[0111] Step 2: Calculate the annual active power output curve of the PV power stations in the region. Calculate the average active power output of the two PV power stations at the same time to obtain the estimated active power output of the PV power stations in the region in the per-unit system. The calculation formula is:

[0112]

[0113] Among them, P PV,d,t* It is the estimated active power output of the PV power station in the region under the per-unit system.

[0114] like Figure 3 As shown in the figure, the per-unit active output curve of the photovoltaic power station throughout the year is drawn.

[0115] Step 3: Calculate the starting time t of the photovoltaic power station every day start and the end time of power generation t end , get the daily power generation time interval t of the photovoltaic power station PV According to the estimated output data of the photovoltaic power station, the active output of the power station P PV,d,t* The first time ε1 exceeds ε1 is the start time of power generation, and the last time the plant's active output exceeds ε1 is the end time of power generation. Based on the plant's raw data, ε1 is set to 0pu. We can calculate that the PV plant starts power generation at 7:25 and ends at 17:05 on the first day, with the power generation time interval being [7:25, 17:05]. Similarly, the power generation time intervals for the other days can be calculated.

[0116] Step 4: In the photovoltaic power station power generation interval t PV The daily cumulative power generation of all photovoltaic power stations in the area is calculated using the following formula:

[0117]

[0118] Among them, E PV,d is the cumulative power generation of the photovoltaic power station on day d, t d,start is the time when the photovoltaic power station starts generating electricity on the dth day, t d,end is the time when the photovoltaic power station ends power generation on the dth day, P PVN It is the total installed capacity of all photovoltaic power stations in the region.

[0119] It can be obtained that the cumulative power generation of all photovoltaic power stations in the area on a certain day is 4.96MWh.

[0120] Step 5: In the photovoltaic power station power generation interval t PV The cumulative power generation of all photovoltaic power stations in the region for 365 days a year is calculated using the following formula:

[0121]

[0122] Among them, E PV It is the cumulative power generation of all photovoltaic power stations in the region for 365 days a year.

[0123] It can be obtained that the cumulative power generation of all photovoltaic power stations in the region for 365 days a year is 2971.86MWh.

[0124] Step 6: Collect historical power load data for the region. Select the historical power load data for a full 365-day year in the region and remove any abnormal data. The time interval for the power load data must be consistent with the time interval for the PV plant's power generation data. Figure 4 The historical curve of power load for the whole year is given.

[0125] Step 7: In the photovoltaic power station power generation interval t PV The daily cumulative power consumption of the power load in the area is calculated using the following formula:

[0126]

[0127] Among them, E L,d P is the cumulative power consumption of the power load in the region on the dth day. L,d,t is the active power load value in the region at time t on the dth day.

[0128] It can be obtained that the total daily electricity consumption of the power load in the area on a certain day is 14.49MWh.

[0129] Step 8: In the photovoltaic power station power generation interval t PV The annual cumulative power consumption of the power load in the area is calculated using the following formula:

[0130]

[0131] Among them, E L It is the annual cumulative electricity consumption of the power load in the region.

[0132] It can be obtained that the annual cumulative electricity consumption of the power load in the region is 6303.9MWh.

[0133] Step 9: In the photovoltaic power station power generation interval t PV The matching power generation and power consumption of the photovoltaic power station output and power load in the region at each moment are calculated. The calculation formula is:

[0134]

[0135]

[0136] Among them, P matchPV,d,t P is the matching power generation power of the photovoltaic power station output and power load in the region at time t on day d, matchL,d,t is the power consumption of the photovoltaic power station output and power load in the region at time t on day d, S N is the rated capacity of the line or substation in the area. match It is the daily matching threshold coefficient between the output of the photovoltaic power station and the power load, with a typical value range of 10% to 30%.

[0137] The rated capacity is 6MW, and the matching threshold coefficient ε match Take 20%. When the absolute value of the deviation between the output of the photovoltaic power station in the region and the power load is less than or equal to 1.2MW, the matching power generation power is equal to the output of the photovoltaic power station, and the matching power consumption is equal to the power load power. When the absolute value of the deviation between the output of the photovoltaic power station in the region and the power load is greater than 1.2MW, it is considered that the output of the photovoltaic power station does not match the power load, and the matching power generation power and the matching power consumption are both equal to 0.

[0138] Step 10: In the photovoltaic power station power generation interval t PV The daily matching power generation and power consumption of the photovoltaic power station output and power load in the area are calculated using the following formula:

[0139]

[0140]

[0141] Among them, E matchPV,d is the power generated by the photovoltaic power station output and power load in the region on day d, E matchL,d It is the electricity consumption of the whole day matching the output of the photovoltaic power station and the power load in the region on day d.

[0142] It can be obtained that the all-day matching electricity generation of the photovoltaic power station output and power load in the region on a certain day is 4.22MWh, and the all-day matching electricity consumption is 9.02MWh.

[0143] Step 11: In the photovoltaic power station power generation interval t PV The annual matching power generation and power consumption of the photovoltaic power station output and power load in the region are calculated using the following formula:

[0144]

[0145]

[0146] Among them E matchPV,d The annual matching power generation of the photovoltaic power station output and power load in the region, E matchL,d To match the output of photovoltaic power stations in the region with the power load throughout the year.

[0147] It can be obtained that the annual matching power generation of the photovoltaic power station output and power load in the region is 2496.11MWh, and the annual matching power consumption is 3976.1MWh.

[0148] Step 12: In the photovoltaic power station power generation interval t PVThe timing matching degree between the output of the photovoltaic power station and the power load in the area is calculated using the following formula:

[0149]

[0150] It can be obtained that the timing matching degree between the output of the photovoltaic power station and the power load in the region is 0.53. match is a coefficient between 0 and 1, K match The higher it is, the better the timing matching between the power station output and the power load.

[0151] Example 3

[0152] Based on the same inventive concept, an embodiment of the present invention further provides a system for analyzing the timing matching between a photovoltaic power station and a power load, comprising:

[0153] An acquisition module is used to acquire photovoltaic data and load data within the calculation area in a time series based on the same time interval;

[0154] An intermediate calculation module is used to obtain the annual cumulative power generation of the photovoltaic power station, the annual cumulative power consumption of the power load, and the annual matching power generation and matching power consumption of the photovoltaic power station output and the power load based on the photovoltaic data and load data;

[0155] The timing matching calculation module is used to calculate the timing matching between the photovoltaic power station output and the power load based on the cumulative power generation of all photovoltaic power stations throughout the year, the cumulative power consumption of the power load throughout the year, and the matching power generation and power consumption throughout the year.

[0156] Preferably, the intermediate calculation module includes:

[0157] A photovoltaic data processing unit, configured to obtain a daily power generation interval of the photovoltaic power station and an annual active power output curve of the photovoltaic power station based on the photovoltaic data;

[0158] a photovoltaic power generation calculation unit, configured to calculate the cumulative power generation of the photovoltaic power station throughout the year based on the daily power generation interval of the photovoltaic power station and the annual active power output curve of the photovoltaic power station;

[0159] A load power consumption calculation unit, configured to calculate the annual cumulative power consumption of the power load based on the load data;

[0160] The matching power consumption calculation unit is used to calculate the annual matching power generation and matching power consumption of the photovoltaic power station output and the power load based on the daily power generation range of the photovoltaic power station, the annual active power output curve of the photovoltaic power station and the set daily matching threshold coefficient between the photovoltaic power station output and the power load.

[0161] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0162] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0163] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0164] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0165] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. A method for analyzing the timing matching degree between a photovoltaic power station and power load, characterized in that: include: Acquire photovoltaic data and load data within the calculation area in a time series based on the same time interval; Based on the photovoltaic data and load data, obtain the cumulative power generation of the photovoltaic power station throughout the year, the cumulative power consumption of the power load throughout the year, and the matching power generation and matching power consumption of the photovoltaic power station output and power load throughout the year; Calculate the temporal matching degree between the output of the photovoltaic power station and the power load based on the cumulative power generation of all the photovoltaic power stations throughout the year, the cumulative power consumption of the power load throughout the year, and the matching power generation and power consumption throughout the year; The method of obtaining the annual cumulative power generation of the photovoltaic power station, the annual cumulative power consumption of the power load, and the annual matching power generation and matching power consumption of the photovoltaic power station output and the power load based on the photovoltaic data and load data includes: Based on the photovoltaic data, obtaining a daily power generation range of the photovoltaic power station and an annual active power output curve of the photovoltaic power station; Calculating the cumulative power generation of the photovoltaic power station throughout the year based on the daily power generation interval of the photovoltaic power station and the annual active power output curve of the photovoltaic power station; Calculating the annual cumulative power consumption of the power load based on the load data; Calculate the annual matching power generation and power consumption of the photovoltaic power station output and power load based on the daily power generation range of the photovoltaic power station, the annual active power output curve of the photovoltaic power station, and the set daily matching threshold coefficient between the photovoltaic power station output and the power load; The timing matching degree between the output of the photovoltaic power station and the power load is calculated as follows: Where: K match : The timing matching degree between the output of photovoltaic power station and power load; E matchPV : The annual matching power generation of the photovoltaic power station output and power load in the region; E matchL : The annual matching power consumption of the photovoltaic power station output and power load in the region; E PV : The cumulative power generation of all photovoltaic power stations in the region throughout the year; E L : The cumulative electricity consumption of the power load in the region throughout the year.

2. The method according to claim 1, wherein The step of obtaining the daily power generation range of the photovoltaic power station and the annual active power output curve of the photovoltaic power station based on the photovoltaic data includes: Convert the power output value of each sample photovoltaic power station in the calculation area into per-unit value; Based on the per-unit power output of each sample PV power station, the average active power output of the PV power station at the same time is calculated to obtain the estimated active power output of all sample PV power stations in the per-unit system; Draw the annual active power output curve of the photovoltaic power stations in the calculation area based on the estimated active power output of all sample photovoltaic power stations; Based on the daily power generation start time and power generation end time of the photovoltaic power station, obtaining the daily power generation interval of the photovoltaic power station; The power generation start time is the time when the active output of the photovoltaic power station exceeds the threshold value for the first time; the power generation end time is the time when the active output of the photovoltaic power station exceeds the threshold value for the last time.

3. The method according to claim 1, wherein The calculation of the annual cumulative power generation of the photovoltaic power station based on the daily power generation interval of the photovoltaic power station and the annual active power output curve of the photovoltaic power station includes: Calculate the daily cumulative power generation of all photovoltaic power stations in the region within the daily power generation interval of the photovoltaic power station based on the annual active power output curve of the photovoltaic power station; The cumulative power generation of all photovoltaic power stations in the region throughout the year is calculated based on the cumulative power generation of all photovoltaic power stations in the region every day.

4. The method according to claim 1, wherein The calculating of the annual cumulative power consumption of the power load based on the load data includes: Calculate the daily cumulative power consumption of the power load in the region based on the daily active power value of the power load in the region during the daily power generation interval of the photovoltaic power station; Based on the daily cumulative power consumption of the power load in the region, the annual cumulative power consumption of the power load in the region is calculated.

5. The method according to claim 1, wherein The calculation of the annual matching power generation and power consumption of the photovoltaic power station output and the power load based on the daily power generation interval of the photovoltaic power station, the annual active power output curve of the photovoltaic power station, and the set daily matching threshold coefficient between the photovoltaic power station output and the power load includes: Calculate, within the daily power generation interval of the photovoltaic power station, the daily matching power generation power and the matching power consumption of the photovoltaic power station output and the power load in the region at each moment based on the annual active power output curve of the photovoltaic power station and the daily matching threshold coefficient between the photovoltaic power station output and the power load; Based on the daily matching power generation and power consumption of the PV power station output and power load in the region at each moment, calculate the daily matching power generation and power consumption of the PV power station output and power load in the region; Based on the daily matching power generation and matching power consumption of the photovoltaic power station output and the power load in the region, the annual matching power generation and matching power consumption of the photovoltaic power station output and the power load in the region are calculated.

6. The method according to claim 5, wherein The matching power generation of the photovoltaic power station output and the power load in the area at each moment is calculated as follows: Where: P matchPV,d,t : The matching power generation of the photovoltaic power station output and the power load in the region at time t on day d; P PVN : total installed capacity of all photovoltaic power stations in the region; P PV,d,t* : estimated active power output of the PV power station in the region under the per-unit system; P L,d,t : active power load value in the region at time t on the dth day; ε match : The daily matching threshold coefficient between the output of the photovoltaic power station and the power load; S N : Rated capacity of the lines or substations in the area; The matching power consumption of the photovoltaic power station output and the power load in the area at each moment is calculated as follows: Where: P matchL,d,t : The power consumption matching the output of the photovoltaic power station and the power load in the region at time t on day d.

7. The method according to claim 1, wherein The step of obtaining photovoltaic data and load data within the calculation area in a time series based on the same time interval includes: Based on a calculation area, multiple photovoltaic power stations within the calculation area are selected as sample photovoltaic power stations, and historical power generation output data of the sample photovoltaic power stations for a full year and historical power load data of the calculation area for a full year are collected; Abnormal data that exceeds a set range is eliminated from the historical power generation output data and the historical power load data.

8. A system for analyzing the timing matching between a photovoltaic power station and power load, characterized in that: include: An acquisition module is used to acquire photovoltaic data and load data within the calculation area in a time series based on the same time interval; An intermediate calculation module is used to obtain the annual cumulative power generation of the photovoltaic power station, the annual cumulative power consumption of the power load, and the annual matching power generation and matching power consumption of the photovoltaic power station output and the power load based on the photovoltaic data and load data; A timing matching calculation module is used to calculate the timing matching degree between the output of the photovoltaic power station and the power load based on the cumulative power generation of all the photovoltaic power stations throughout the year, the cumulative power consumption of the power load throughout the year, and the matching power generation and power consumption throughout the year; The intermediate calculation module includes: A photovoltaic data processing unit, configured to obtain a daily power generation interval of the photovoltaic power station and an annual active power output curve of the photovoltaic power station based on the photovoltaic data; a photovoltaic power generation calculation unit, configured to calculate the cumulative power generation of the photovoltaic power station throughout the year based on the daily power generation interval of the photovoltaic power station and the annual active power output curve of the photovoltaic power station; A load power consumption calculation unit, configured to calculate the annual cumulative power consumption of the power load based on the load data; a matching power consumption calculation unit, configured to calculate the annual matching power generation and matching power consumption of the photovoltaic power station output and the power load based on the daily power generation interval of the photovoltaic power station, the annual active power output curve of the photovoltaic power station, and the set daily matching threshold coefficient between the photovoltaic power station output and the power load; The timing matching degree between the output of the photovoltaic power station and the power load is calculated as follows: Where: K match : The timing matching degree between the output of photovoltaic power station and power load; E matchPV : The annual matching power generation of the photovoltaic power station output and power load in the region; E matchL : The annual matching power consumption of the photovoltaic power station output and power load in the region; E PV : The cumulative power generation of all photovoltaic power stations in the region throughout the year; E L : The cumulative electricity consumption of the power load in the region throughout the year.

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