CN114784792A - Power grid planning method for grid connection of photovoltaic power station - Google Patents
Power grid planning method for grid connection of photovoltaic power station Download PDFInfo
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Abstract
The invention provides a power grid planning method for grid connection of a photovoltaic power station, belongs to the technical field of power grid operation and maintenance, and comprises the steps of historical estimation, preliminary planning, actual measurement and calculation, re-planning and the like. According to the invention, the target photovoltaic power station is actually measured and calculated in a short period, the relation curve of the illumination intensity and the actual power supply quantity of the target photovoltaic power station can be directly measured and calculated from the result after grid connection, the future all-day power supply quantity distribution of the target photovoltaic power station is estimated according to the relation curve and weather forecast data, and then the power supply quantity supplemented to the power grid by the photovoltaic power station is planned and adjusted in advance according to the requirement of the power grid, so that more response, regulation, correction and remediation time can be provided, thus the situation that each photovoltaic power station is provided with complicated electrical equipment for adjustment is avoided, the equipment cost of photovoltaic power generation and power grid operation and maintenance is reduced, the management of operation and maintenance personnel is facilitated, and the safety and stability of the power grid operation are improved.
Description
Technical Field
The invention belongs to the technical field of power grid operation and maintenance, and particularly relates to a power grid planning method for grid connection of a photovoltaic power station.
Background
The photovoltaic power generation grid connection is that direct current generated by a solar component is converted into alternating current meeting the requirements of a mains supply power grid through a grid connection inverter and then is directly connected to a public power grid. In recent years, with the development of photovoltaic technology and the encouragement of related policies, the construction of photovoltaic power stations is gradually increased, and in some areas, the electric energy supply can take a greater proportion.
Because the power supply quantity of the photovoltaic power station is greatly influenced by weather (especially illumination intensity), the characteristics of weak stability of power supply all day and difficult estimation of the power supply quantity exist, and therefore, in order to avoid influencing the operation stability of a power grid, some electrical equipment is required to be used for adjustment.
However, the method of adjusting by using electrical equipment is more suitable for large-scale photovoltaic power stations, but because large-scale photovoltaic power stations have large investment, long construction period and large occupied area, the speed and the quantity of construction and grid connection of the large-scale photovoltaic power stations are far lower than those of distributed small-scale photovoltaic power stations, especially photovoltaic power stations integrated with photovoltaic buildings. And miniature power station exists miniaturization, a large amount, dispersion degree is high, the little characteristics of single photovoltaic power station power supply volume, if all install these electrical equipment to all small-size photovoltaic power stations and adjust, can greatly increased cost, and the management is also very inconvenient. Meanwhile, in recent years, more and more photovoltaic power stations are newly connected to the grid, and the stability of the operation of the power grid can be influenced if a large amount of power stations are connected to the grid in a short period.
Disclosure of Invention
The invention aims to provide a power grid planning method for grid connection of a photovoltaic power station, and aims to solve the technical problems that the stability of power supply of the photovoltaic power station all day is not strong, and the power supply quantity is difficult to estimate, so that the stability of power grid operation is easily influenced in the prior art.
In order to realize the purpose, the invention adopts the technical scheme that: the utility model provides a power grid planning method for grid connection of photovoltaic power stations, which comprises the following steps:
s300, actual measurement and calculation, namely monitoring the illumination intensity of the area where the target photovoltaic power station is located and the actual power supply amount of the target photovoltaic power station within a preset time period after the target photovoltaic power station is connected to a power grid, and generating a second relation curve for the illumination intensity and the actual power supply amount of the target photovoltaic power station;
and S400, planning again, namely combining the weather forecast data of the area with the second relation curve to estimate the future all-day power supply distribution of the target photovoltaic power station, and planning the power supply of the target photovoltaic power station according to the future all-day power supply distribution and the all-day power supply requirement of the power grid of the area, wherein the weather forecast data of the area comprises the all-day illumination intensity distribution.
In a possible implementation manner, before step S300, the method further includes:
s100, historical estimation, namely combining historical data of the operation of the photovoltaic power station in the area with historical illumination intensity data of the area to generate a first relation curve of the illumination intensity and the power supply amount in unit area;
s200, primarily planning, namely combining the scale data of a target photovoltaic power station to be planned, the weather forecast data of the area and the first relation curve to estimate the future all-day power supply distribution of the target photovoltaic power station, and primarily planning the power supply of the target photovoltaic power station according to the future all-day power supply distribution and the all-day power supply requirement of the power grid of the area, wherein the scale data of the target photovoltaic power station comprises the installed capacity of the target photovoltaic power station, and the weather forecast data of the area comprises the all-day illumination intensity distribution.
In one possible implementation, step S100 includes:
s110, obtaining historical data and historical illumination intensity data of operation of the photovoltaic power station in the area, wherein the historical data of operation of the photovoltaic power station comprises average power supply quantity and average electric energy conversion rate of unit area in different time periods of the whole day, and the historical illumination intensity data comprises average illumination intensity in different time periods of the whole day, wherein the average power supply quantity of the unit area in different time periods of the whole day is the average value of the power supply quantity of the unit time in each time period after the whole day is divided into a plurality of time periods, and the average illumination intensity in different time periods of the whole day is the average value of the illumination intensity of the unit time in each time period after the whole day is divided into a plurality of time periods;
s120, establishing a planar rectangular coordinate system by taking the power supply quantity and the illumination intensity as an X axis and a Y axis respectively, and inputting the average power supply quantity and the average illumination intensity corresponding to the same time period into the planar rectangular coordinate system as a point to form a scatter diagram;
s130, fitting the first relation curve on the scatter diagram according to the density degree.
In one possible implementation, the areas of the area are divided according to the power grid management area or according to the climate condition, if the area has historical data of the operation of the photovoltaic power station in the area, the historical data of the operation of the photovoltaic power station in the area is adopted, and if the area has no historical data of the operation of the photovoltaic power station in the area adjacent to the area, the historical data of the operation of the photovoltaic power station in the area adjacent to the area is adopted.
In one possible implementation, step S200 includes:
s210, obtaining scale data of the target photovoltaic power station to be planned, wherein the scale data comprises installed capacity and theoretical electric energy conversion rate of the target photovoltaic power station to be planned;
s220, correcting the first relation curve by using the ratio of the theoretical electric energy conversion rate of the target photovoltaic power station to be planned to the average electric energy conversion rate in the historical data of the operation of the photovoltaic power station in the area to form a corrected first relation curve;
s230, obtaining the illumination intensity distribution of the future whole day through weather forecast data, importing the illumination intensity distribution of the future whole day into the corrected first relation curve, and generating the future whole day power supply distribution of the target photovoltaic power station, wherein the future whole day power supply distribution is the maximum power supply distribution which can be provided by the target photovoltaic power station in different time periods of the future whole day;
s240, predicting the future all-day power supply requirement of the regional power grid, preliminarily planning the future all-day grid-connected electric quantity of the target photovoltaic power station according to the future all-day power supply requirement of the regional power grid, supplying power to the target photovoltaic power station at full load when the power supply requirement of the power grid in a certain period of time is greater than or equal to the power supply quantity of the target photovoltaic power station in the period of time in the future, and supplying power to the target photovoltaic power station according to a power utilization gap part when the power supply requirement of the power grid in the certain period of time in the future is less than the power supply quantity of the target photovoltaic power station in the period of time;
s250, judging the power supply requirement of the regional power grid in real time when the regional power grid runs, and if the deviation between the power supply requirement of the regional power grid and the estimated power supply requirement of the time interval is in an allowable range, carrying out grid-connected power supply according to the original primary plan; if the deviation between the power supply demand of the regional power grid and the estimated power supply demand in the time interval exceeds the allowable range, correcting the original initial plan, namely increasing or reducing the grid-connected electric quantity of the target photovoltaic power station; wherein, the allowable range of the deviation is determined according to the allowable load of the power grid.
In one possible implementation manner, in step S220, the step of performing the correction includes: the average power supply amount to the first relation is multiplied by the ratio.
In one possible implementation, step S300 includes:
s310, after a target photovoltaic power station is connected to a power grid, obtaining average actual power supply quantity of a unit area in different time periods of a whole day of multiple days and average actual illumination intensity of an area where the target photovoltaic power station is located in different time periods of the whole day by monitoring, wherein the average actual power supply quantity of the unit area in different time periods of the whole day is an average value of the actual power supply quantity of the unit time in each time period after the whole day is divided into the multiple time periods, and the average actual illumination intensity in different time periods of the whole day is an average value of the actual illumination intensity of the unit time in each time period after the whole day is divided into the multiple time periods;
s320, establishing a plane rectangular coordinate system by respectively taking the actual power supply quantity and the actual illumination intensity as an X axis and a Y axis, taking the average actual power supply quantity and the average actual illumination intensity corresponding to the same time period as the coordinates of one point, generating the coordinates of all the points of the multi-day data in the step S310, and inputting the coordinates into the plane rectangular coordinate system to form a scatter diagram;
s330, fitting the second relation curve on the scatter diagram according to the density degree.
In one possible implementation, step S400 includes:
s410, obtaining the illumination intensity distribution of the future whole day through weather forecast data, importing the illumination intensity distribution of the future whole day into a second relation curve, and generating the future whole day power supply distribution of the target photovoltaic power station, wherein the future whole day power supply distribution is the maximum power supply distribution which can be provided by the target photovoltaic power station in different time periods of the future whole day;
s420, predicting the future all-day power supply requirement of the regional power grid, preliminarily planning the future all-day grid-connected electric quantity of the target photovoltaic power station according to the future all-day power supply requirement of the regional power grid, supplying power to the target photovoltaic power station at full load when the power supply requirement of the power grid in a certain period of time is greater than or equal to the power supply quantity of the target photovoltaic power station in the period of time in the future, and supplying power to the target photovoltaic power station according to a power utilization gap part when the power supply requirement of the power grid in the certain period of time in the future is less than the power supply quantity of the target photovoltaic power station in the period of time;
s430, judging the power supply requirement of the regional power grid in real time when the regional power grid runs, and if the deviation between the power supply requirement of the regional power grid and the estimated power supply requirement of the time interval is in an allowable range, carrying out grid-connected power supply according to an original primary plan; if the deviation between the power supply demand of the regional power grid and the estimated power supply demand in the time interval exceeds the allowable range, correcting the original initial plan, namely increasing or reducing the grid-connected electric quantity of the target photovoltaic power station; wherein, the allowable range of the deviation is determined according to the allowable load of the power grid.
In a possible implementation manner, the power grid planning method for grid connection of the photovoltaic power station further includes the following steps:
s500, intermittently correcting, namely repeating the step S300 and the step S400 after the target photovoltaic power station operates for a period of time, and correcting;
intermittent corrections are made at least once every season.
In a possible implementation manner, the power grid planning method for grid connection of the photovoltaic power station further includes the following steps:
s600, fault feedback, and in the operation process of the target photovoltaic power station, if the deviation between the grid-connected electric quantity of the target photovoltaic power station and the estimated numerical value exceeds a preset range in a short period, informing operation and maintenance personnel of the target photovoltaic power station, and checking the target photovoltaic power station.
The power grid planning method for grid connection of the photovoltaic power station has the advantages that: compared with the prior art, the method has the advantages that the unreliability of the parameters of the target photovoltaic power station can be ignored by actually measuring and calculating the target photovoltaic power station in a short term, the relation curve of the illumination intensity and the actual power supply quantity is directly measured and calculated from the result after grid connection, the illumination intensity distribution of the target photovoltaic power station in the future all day is firstly calculated according to the relation curve and weather forecast data, the power supply quantity distribution of the target photovoltaic power station in the future all day is estimated according to the illumination intensity distribution of the future all day, the power supply quantity supplemented to the power grid of the photovoltaic power station can be planned and adjusted in advance according to the requirement of the power grid after the power supply quantity distribution in the future all day, the future power supply condition is predicted, compared with the installation of electrical equipment, the method has more time for responding, regulating, correcting and remedying, and therefore, the complicated electrical equipment is prevented from being installed on each photovoltaic power station, the photovoltaic power generation and power grid operation and maintenance equipment cost is reduced, operation and maintenance personnel management is facilitated, and meanwhile, the safety and stability of power grid operation are improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the embodiments or the prior art description will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings may be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic diagram of a power grid planning method for grid connection of a photovoltaic power station according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
It should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more, and "several" means one or more unless specifically limited otherwise.
The power grid planning method for grid connection of photovoltaic power stations provided by the invention is explained.
The power grid planning method for grid connection of the photovoltaic power station provided by the first embodiment of the invention comprises the following steps:
s100, historical estimation, namely combining historical data of operation of the photovoltaic power station in the area with historical illumination intensity data of the area to generate a first relation curve of the illumination intensity and the power supply amount in unit area.
S200, primarily planning, namely combining the scale data of a target photovoltaic power station to be planned, the weather forecast data of the area and the first relation curve to estimate the future all-day power supply quantity distribution of the target photovoltaic power station, and primarily planning the power supply of the target photovoltaic power station according to the future all-day power supply quantity distribution and the all-day power supply requirement of the power grid of the area, wherein the scale data of the target photovoltaic power station comprises the installed capacity of the target photovoltaic power station, and the weather forecast data of the area comprises the all-day illumination intensity distribution.
S300, actual measurement and calculation, namely monitoring the illumination intensity of the area where the target photovoltaic power station is located and the actual power supply amount of the target photovoltaic power station within a preset time period after the target photovoltaic power station is connected to a power grid, and generating a second relation curve aiming at the illumination intensity and the actual power supply amount of the target photovoltaic power station.
In the actual measurement and calculation stage, under the condition that conditions allow, the target photovoltaic power station supplies power at full load as far as possible so as to monitor more real data; if the conditions are not allowed and must be adjusted to prevent full power, the adjusted time period can be ignored or corrected when the data is processed, and if the amount of data is insufficient, the monitoring time can be increased.
And S400, planning again, namely combining the weather forecast data of the area with the second relation curve to estimate the future all-day power supply distribution of the target photovoltaic power station, and planning the power supply of the target photovoltaic power station according to the future all-day power supply distribution and the all-day power supply requirement of the power grid of the area, wherein the weather forecast data of the area comprises the all-day illumination intensity distribution.
S500, intermittently correcting, namely repeating the step S300 and the step S400 after the target photovoltaic power station operates for a period of time, and correcting; intermittent corrections are made at least once every season.
S600, fault feedback, and in the operation process of the target photovoltaic power station, if the deviation between the grid-connected electric quantity of the target photovoltaic power station and the estimated numerical value exceeds a preset range in a short period, informing operation and maintenance personnel of the target photovoltaic power station, and checking the target photovoltaic power station.
Because the illumination in the same area is approximately consistent, in actual operation, the target photovoltaic power station can be a single photovoltaic power station or a collection of a plurality of same photovoltaic power stations.
The power grid planning method for grid connection of the photovoltaic power station provided by the embodiment comprises the steps of firstly estimating through historical data to generate a first relation curve of the general illumination intensity of the photovoltaic power station and the power supply quantity in unit area, then roughly estimating the future all-day power supply quantity distribution of the photovoltaic power station through the first relation curve generated by utilizing the historical data and combining weather forecast data, the new grid-connected target photovoltaic power station is planned in advance to guide the operation of the new grid-connected target photovoltaic power station, although the historical data can not completely accord with the new grid-connected target photovoltaic power station due to the influence of factors such as the change of the photoelectric conversion rate caused by the technical upgrade and the like, but also can roughly estimate in the trend and carry out peak clipping and valley filling in a targeted manner, thereby ensuring the safety and stability of the power grid to the maximum extent and greatly reducing the pressure of grid connection of large photovoltaic power stations and a large number of small photovoltaic power stations on the safe operation of the power grid; then, by carrying out short-term actual measurement and calculation on the target photovoltaic power station after grid connection, unreliability of parameters of the target photovoltaic power station can be ignored, a second relation curve of the illumination intensity and the actual power supply quantity is directly measured and calculated from results after grid connection, the illumination intensity distribution of the target photovoltaic power station in the future all day is firstly calculated according to weather forecast data by the relation curve, the power supply quantity distribution of the target photovoltaic power station in the future all day is estimated according to the illumination intensity distribution of the future all day, the power supply quantity supplemented to the power grid of the photovoltaic power station can be planned and adjusted in advance according to the requirements of the power grid after the power supply quantity distribution in the future all day, namely, the future power supply condition is predicted, compared with the installation of electrical equipment, the method has more time for response, regulation, correction and remediation, and adjustment, and thus avoiding the installation of complicated electrical equipment on each photovoltaic power station, the photovoltaic power generation and power grid operation and maintenance equipment cost is reduced, the operation and maintenance personnel can manage the photovoltaic power generation and power grid, and the safety and stability of the power grid operation are improved; and then, the influence caused by the reduction of the power supply quantity of the photovoltaic panel due to the reasons of dust accumulation, equipment aging and the like is compensated through intermittent correction, the regulation and control accuracy is ensured, if a target photovoltaic power station breaks down in the operation process, the daily operation data of the target photovoltaic power station can change in a short term, operation and maintenance personnel of the target photovoltaic power station can be informed through a fault feedback mode, the target photovoltaic power station is checked, the loss expansion of the target photovoltaic power station can be avoided, the planning strategy can be timely adjusted according to the feedback condition, and the safe and stable operation of a power grid is ensured.
The power grid planning method for grid connection of the photovoltaic power station provided by the second embodiment of the invention comprises the following steps:
s110, obtaining historical data and historical illumination intensity data of operation of the photovoltaic power station in the area, wherein the historical data of operation of the photovoltaic power station comprises average power supply quantity and average electric energy conversion rate of unit area in different time periods of the whole day, the historical illumination intensity data comprises average illumination intensity in different time periods of the whole day, the average power supply quantity of the unit area in different time periods of the whole day is the average value of the power supply quantity of the unit time in each time period after the whole day is divided into a plurality of time periods, and the average illumination intensity in different time periods of the whole day is the average value of the illumination intensity of the unit time in each time period after the whole day is divided into a plurality of time periods.
The areas of the area are divided according to the power grid management area or the climate condition, if the area has historical data of operation of the photovoltaic power station, the historical data of operation of the photovoltaic power station of the area is adopted, and if the area has no historical data of operation of the photovoltaic power station, the historical data of operation of the photovoltaic power station of the area adjacent to the area is adopted.
S120, establishing a planar rectangular coordinate system by taking the power supply quantity and the illumination intensity as an X axis and a Y axis respectively, and inputting the average power supply quantity and the average illumination intensity corresponding to the same time period into the planar rectangular coordinate system as a point to form a scatter diagram.
S130, fitting the first relation curve on the scatter diagram according to the density degree, so that measurement errors caused by some special reasons can be ignored, and the relation curve is more accurate.
S210, obtaining scale data of the target photovoltaic power station to be planned, wherein the scale data comprises installed capacity and theoretical electric energy conversion rate of the target photovoltaic power station to be planned;
s220, correcting the first relation curve by using the ratio of the theoretical electric energy conversion rate of the target photovoltaic power station to be planned to the average electric energy conversion rate in historical data of the operation of the photovoltaic power station in the area to form a corrected first relation curve; wherein the step of modifying comprises: the average power supply amount to the first relation is multiplied by the ratio.
S230, obtaining the illumination intensity distribution of the future whole day through weather forecast data, importing the illumination intensity distribution of the future whole day into the corrected first relation curve, and generating the future whole day power supply distribution of the target photovoltaic power station, wherein the future whole day power supply distribution is the maximum power supply distribution which can be provided by the target photovoltaic power station in different time periods of the future whole day;
s240, predicting the future all-day power supply requirement of the regional power grid, preliminarily planning the future all-day grid-connected electric quantity of the target photovoltaic power station according to the future all-day power supply requirement of the regional power grid, supplying power to the target photovoltaic power station at full load when the power supply requirement of the power grid in a certain period of time is greater than or equal to the power supply quantity of the target photovoltaic power station in the period of time in the future, and supplying power to the target photovoltaic power station according to a power utilization gap part when the power supply requirement of the power grid in the certain period of time in the future is less than the power supply quantity of the target photovoltaic power station in the period of time;
s250, judging the power supply requirement of the regional power grid in real time when the regional power grid runs, and if the deviation between the power supply requirement of the regional power grid and the estimated power supply requirement of the time period is within an allowable range, carrying out grid-connected power supply according to the original initial plan; if the deviation between the power supply demand of the regional power grid and the estimated power supply demand in the time interval exceeds the allowable range, correcting the original primary plan, namely increasing or reducing the grid-connected electric quantity of the target photovoltaic power station; wherein the allowable deviation range is determined according to the allowable load of the power grid.
S310, after a target photovoltaic power station is connected to a power grid, obtaining average actual power supply quantity of a unit area in different time periods of a whole day of multiple days and average actual illumination intensity of an area where the target photovoltaic power station is located in different time periods of the whole day by monitoring, wherein the average actual power supply quantity of the unit area in different time periods of the whole day is an average value of the actual power supply quantity of the unit time in each time period after the whole day is divided into the multiple time periods, and the average actual illumination intensity in different time periods of the whole day is an average value of the actual illumination intensity of the unit time in each time period after the whole day is divided into the multiple time periods;
s320, establishing a plane rectangular coordinate system by respectively taking the actual power supply quantity and the actual illumination intensity as an X axis and a Y axis, taking the average actual power supply quantity and the average actual illumination intensity corresponding to the same time period as the coordinates of one point, generating the coordinates of all the points of the multi-day data in the step S310, and inputting the coordinates into the plane rectangular coordinate system to form a scatter diagram;
s330, fitting the second relation curve on the scatter diagram according to the density degree.
S410, obtaining the illumination intensity distribution of the future whole day through weather forecast data, and leading the illumination intensity distribution of the future whole day into a second relation curve to generate the future whole day power supply distribution of the target photovoltaic power station, wherein the future whole day power supply distribution is the maximum power supply distribution which can be provided by the target photovoltaic power station in different time periods of the future whole day;
s420, predicting the future all-day power supply requirement of the regional power grid, preliminarily planning the future all-day grid-connected power quantity of the target photovoltaic power station according to the future all-day power supply requirement of the regional power grid, supplying power to the target photovoltaic power station at full load when the power supply requirement of the power grid in a future period is greater than or equal to the power supply quantity of the target photovoltaic power station in the future period, and supplying power to the target photovoltaic power station according to the power utilization gap part when the power supply requirement of the power grid in the future period is smaller than the power supply quantity of the target photovoltaic power station in the future period;
s430, judging the power supply requirement of the regional power grid in real time when the regional power grid runs, and if the deviation between the power supply requirement of the regional power grid and the estimated power supply requirement of the time interval is in an allowable range, carrying out grid-connected power supply according to an original primary plan; if the deviation between the power supply demand of the regional power grid and the estimated power supply demand in the time interval exceeds the allowable range, correcting the original initial plan, namely increasing or reducing the grid-connected electric quantity of the target photovoltaic power station; wherein, the allowable range of the deviation is determined according to the allowable load of the power grid.
S500, intermittently correcting, namely repeating the step S300 and the step S400 after the target photovoltaic power station operates for a period of time, and correcting; intermittent corrections are made at least once every season.
S600, fault feedback is carried out, and in the operation process of the target photovoltaic power station, if deviation between grid-connected electric quantity of the target photovoltaic power station and the estimated numerical value exceeds a preset range in a short period, operation and maintenance personnel of the target photovoltaic power station are notified, and the target photovoltaic power station is checked.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A power grid planning method for grid connection of photovoltaic power stations is characterized by comprising the following steps:
s300, actual measurement and calculation, namely monitoring the illumination intensity of the area where the target photovoltaic power station is located and the actual power supply amount of the target photovoltaic power station within a preset time period after the target photovoltaic power station is connected to a power grid, and generating a second relation curve for the illumination intensity and the actual power supply amount of the target photovoltaic power station;
and S400, planning again, namely combining the weather forecast data of the area with the second relation curve to estimate the future all-day power supply distribution of the target photovoltaic power station, and planning the power supply of the target photovoltaic power station according to the future all-day power supply distribution and the all-day power supply requirement of the power grid of the area, wherein the weather forecast data of the area comprises the all-day illumination intensity distribution.
2. The power grid planning method for grid connection of photovoltaic power plants according to claim 1, characterized in that before step S300, it further comprises:
s100, historical estimation, namely combining historical data of operation of the photovoltaic power station in the area with historical illumination intensity data of the area to generate a first relation curve of the illumination intensity and the power supply quantity per unit area;
s200, primarily planning, namely combining the scale data of a target photovoltaic power station to be planned, the weather forecast data of the area and the first relation curve to estimate the future all-day power supply distribution of the target photovoltaic power station, and primarily planning the power supply of the target photovoltaic power station according to the future all-day power supply distribution and the all-day power supply requirement of the power grid of the area, wherein the scale data of the target photovoltaic power station comprises the installed capacity of the target photovoltaic power station, and the weather forecast data of the area comprises the all-day illumination intensity distribution.
3. The power grid planning method for grid connection of photovoltaic power plants according to claim 2, wherein step S100 comprises:
s110, obtaining historical data and historical illumination intensity data of operation of the photovoltaic power station in the area, wherein the historical data of the operation of the photovoltaic power station comprises average power supply quantity and average electric energy conversion rate of a unit area in different time periods of the whole day, and the historical illumination intensity data comprises average illumination intensity in different time periods of the whole day, the average power supply quantity of the unit area in different time periods of the whole day refers to the average value of the power supply quantity of the unit time in each time period after the whole day is divided into a plurality of time periods, and the average illumination intensity in different time periods of the whole day refers to the average value of the illumination intensity of the unit time in each time period after the whole day is divided into a plurality of time periods;
s120, establishing a planar rectangular coordinate system by taking the power supply quantity and the illumination intensity as an X axis and a Y axis respectively, and inputting the average power supply quantity and the average illumination intensity corresponding to the same time period into the planar rectangular coordinate system as a point to form a scatter diagram;
s130, fitting the first relation curve on the scatter diagram according to the density degree.
4. A power grid planning method for grid connection of photovoltaic power plants according to claim 3, characterized in that: the area of the area is divided according to the power grid management area or according to the climate condition, if the area has historical data of the operation of the photovoltaic power station, the historical data of the operation of the photovoltaic power station of the area is adopted, and if the area has no historical data of the operation of the photovoltaic power station, the historical data of the operation of the photovoltaic power station of the area adjacent to the area is adopted.
5. A power grid planning method for grid connection of photovoltaic power plants according to claim 3, characterized in that step S200 comprises:
s210, obtaining scale data of the target photovoltaic power station to be planned, wherein the scale data comprises installed capacity and theoretical electric energy conversion rate of the target photovoltaic power station to be planned;
s220, correcting the first relation curve by using the ratio of the theoretical electric energy conversion rate of the target photovoltaic power station to be planned to the average electric energy conversion rate in historical data of the operation of the photovoltaic power station in the area to form a corrected first relation curve;
s230, obtaining the illumination intensity distribution of the future whole day through weather forecast data, importing the illumination intensity distribution of the future whole day into the corrected first relation curve, and generating the future whole day power supply distribution of the target photovoltaic power station, wherein the future whole day power supply distribution is the maximum power supply distribution which can be provided by the target photovoltaic power station in different time periods of the future whole day;
s240, predicting the future all-day power supply requirement of the regional power grid, preliminarily planning the future all-day grid-connected power quantity of the target photovoltaic power station according to the future all-day power supply requirement of the regional power grid, supplying power to the target photovoltaic power station at full load when the power supply requirement of the power grid in a future period is greater than or equal to the power supply quantity of the target photovoltaic power station in the future period, and supplying power to the target photovoltaic power station according to the power utilization gap part when the power supply requirement of the power grid in the future period is smaller than the power supply quantity of the target photovoltaic power station in the future period;
s250, judging the power supply requirement of the regional power grid in real time when the regional power grid runs, and if the deviation between the power supply requirement of the regional power grid and the estimated power supply requirement of the time interval is in an allowable range, carrying out grid-connected power supply according to the original primary plan; if the deviation between the power supply demand of the regional power grid and the estimated power supply demand in the time interval exceeds the allowable range, correcting the original primary plan, namely increasing or reducing the grid-connected electric quantity of the target photovoltaic power station; wherein, the allowable range of the deviation is determined according to the allowable load of the power grid.
6. The power grid planning method for grid connection of photovoltaic power plants according to claim 5, wherein in step S220, the step of modifying comprises: the average power supply amount to the first relation is multiplied by the ratio.
7. The method for grid-connection of photovoltaic power plants according to claim 1, characterized in that step S300 comprises:
s310, after a target photovoltaic power station is connected to a power grid, obtaining average actual power supply quantity of unit areas in different time periods of a whole day of multiple days and average actual illumination intensity of an area where the target photovoltaic power station is located in different time periods of the whole day by monitoring, wherein the average actual power supply quantity of the unit areas in the different time periods of the whole day is an average value of the actual power supply quantity of the unit time in each time period after the whole day is divided into the multiple time periods, and the average actual illumination intensity in the different time periods of the whole day is an average value of the actual illumination intensity of the unit time in each time period after the whole day is divided into the multiple time periods;
s320, respectively taking the actual power supply quantity and the actual illumination intensity as an X axis and a Y axis to establish a planar rectangular coordinate system, taking the average actual power supply quantity and the average actual illumination intensity corresponding to the same time period as the coordinates of one point, generating the coordinates of all the points of the multi-day data in the step S310, and inputting the coordinates into the planar rectangular coordinate system to form a scatter diagram;
s330, fitting the second relation curve on the scatter diagram according to the density degree.
8. The power grid planning method for grid connection of photovoltaic power plants according to claim 7, wherein step S400 comprises:
s410, obtaining the illumination intensity distribution of the future whole day through weather forecast data, importing the illumination intensity distribution of the future whole day into a second relation curve, and generating the future whole day power supply distribution of the target photovoltaic power station, wherein the future whole day power supply distribution is the maximum power supply distribution which can be provided by the target photovoltaic power station in different time periods of the future whole day;
s420, predicting the future all-day power supply requirement of the regional power grid, preliminarily planning the future all-day grid-connected power quantity of the target photovoltaic power station according to the future all-day power supply requirement of the regional power grid, supplying power to the target photovoltaic power station at full load when the power supply requirement of the power grid in a future period is greater than or equal to the power supply quantity of the target photovoltaic power station in the future period, and supplying power to the target photovoltaic power station according to the power utilization gap part when the power supply requirement of the power grid in the future period is smaller than the power supply quantity of the target photovoltaic power station in the future period;
s430, judging the power supply requirement of the regional power grid in real time when the regional power grid runs, and if the deviation between the power supply requirement of the regional power grid and the estimated power supply requirement of the time interval is in an allowable range, carrying out grid-connected power supply according to an original primary plan; if the deviation between the power supply demand of the regional power grid and the estimated power supply demand in the time interval exceeds the allowable range, correcting the original primary plan, namely increasing or reducing the grid-connected electric quantity of the target photovoltaic power station; wherein, the allowable range of the deviation is determined according to the allowable load of the power grid.
9. The power grid planning method for grid connection of photovoltaic power plants according to claim 1, characterized in that it further comprises the following steps:
s500, intermittently correcting, namely repeating the step S300 and the step S400 after the target photovoltaic power station operates for a period of time, and correcting;
intermittent corrections are made at least once every season.
10. The power grid planning method for grid connection of photovoltaic power plants according to claim 1, characterized in that it further comprises the following steps:
s600, fault feedback is carried out, and in the operation process of the target photovoltaic power station, if deviation between grid-connected electric quantity of the target photovoltaic power station and the estimated numerical value exceeds a preset range in a short period, operation and maintenance personnel of the target photovoltaic power station are notified, and the target photovoltaic power station is checked.
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| CN115276105B (en) * | 2022-09-26 | 2022-12-27 | 国网浙江省电力有限公司宁海县供电公司 | Photovoltaic access capacity planning and multi-energy complementary distributed energy management method |
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