CN116245680A - Photovoltaic absorption rate calculation method based on complementation in water, light and month of clean energy base - Google Patents
Photovoltaic absorption rate calculation method based on complementation in water, light and month of clean energy base Download PDFInfo
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Abstract
The invention discloses a method for calculating complementary photovoltaic absorption rate in water, light and month based on a clean energy base. The water-light complementary benefits are considered in the middle-long term scheduling, so that the optimized distribution of the water-light integrated clean energy base water quantity and the electric quantity in the middle-long term period is realized, the synergy between the water power and the photovoltaic is promoted, the overall benefits of the complementary system are optimal as much as possible, and the middle-long term scheduling problem of the water-light complementary system is solved. The method has practical guiding significance for planning and designing the scale of the cascade hydropower station and the photovoltaic installation of the water-light integrated clean energy base and for long-term dispatching operation of the water-light integrated clean energy base.
Description
Technical Field
The invention relates to a clean energy base hydropower and photovoltaic scale.
Background
In the comprehensive management of water resources of the river basin cascade hydropower station, the scheduling with a scheduling period of ten days, months or longer is commonly called medium-long term scheduling. The study object is usually a hydropower station reservoir with annual regulation and above. Compared with short-term scheduling, the medium-term scheduling has the advantage of fully utilizing seasonal information of runoffs, thereby ensuring relatively better benefits of the hydropower station reservoir in long-term operation. At present, less research on medium-long term scheduling of a water-light complementary system is mainly focused on the aspect of water-light-day complementary short-term scheduling, and according to a photovoltaic absorption rate calculation method based on clean energy base water-light-day complementary in patent application 202110712306.X, the photovoltaic absorption rate calculation is performed by calculating the photovoltaic output and the residual capacity of a power transmission channel in a period of time, calculating the hydropower adjustable output, and obtaining photovoltaic absorption 1 under the condition of no adjustment and photovoltaic absorption 2 under the condition of maximum hydropower adjustment. The invention uses the daily regulation capability of the hydropower station to keep the daily power generation amount of the hydropower station unchanged as a principle, and utilizes channels to absorb photovoltaic as much as possible by regulating the time-by-time output process within one day of the hydropower station. The method is characterized in that the daily hydro-optical complementation calculation is carried out by adopting the daily hydro-optical average output and the photovoltaic typical meteorological 365 days 8760 hours output process.
For a water-light complementary system with annual and superior regulation capability, the result of relatively better benefit of the complementary system during long-term operation cannot be obtained by only relying on short-term water-light complementary calculation day by day. According to the principle of annual adjustment hydropower station optimal scheduling, the optimal operation mode of the hydropower station is generally to gradually raise the power generation water head with lower output operation at the beginning of each year, and increase the output operation when the water supply in the period of high water is increased. However, this feature is not conducive to photovoltaic power consumption. Because the space of photovoltaic power generation can be occupied when the water and electricity output is high in the flood season, the photovoltaic power discarding is increased. It can be seen that there is a certain contradiction between hydroelectric power generation and photovoltaic power consumption.
Disclosure of Invention
The invention aims to solve the technical problems that: because of a certain contradiction between hydroelectric power generation and photovoltaic power consumption, the existing daily water-light complementary calculation cannot obtain a result with relatively good benefit of the complementary system in the long-term operation process, so that how to realize long-term scheduling in the water-light complementary system is a problem to be solved by the invention.
The photovoltaic output has the characteristics that the annual and monthly total electric quantity is smaller in difference between years, and the photovoltaic daily electric quantity is greatly changed due to the influence of weather such as sunny days, rainy days, cloudy days and the like. According to the statistics of related data, the maximum annual photovoltaic electric quantity is about 1.05 times of the average electric quantity of a plurality of years, the maximum monthly electric quantity is about 1.2 times of the average monthly electric quantity of a plurality of years, and the average output on sunny days is about 5 times of the average output on rainy days. It is stated that the total power is relatively stable over a time scale of more than month for photovoltaic cells, while the daily power varies greatly due to weather. The annual adjustment hydropower station can adjust the flow to generate electricity according to the equal output within one month, and can also adjust the capacity of the hydropower station for adapting to the change of the photovoltaic daily electric quantity to absorb the photovoltaic electric quantity to the maximum extent according to the characteristic that the photovoltaic daily output is greatly influenced by weather on the premise of keeping the average output of the month basically unchanged. Therefore, the water-light complementary system with the annual reservoir regulation can utilize seasonal information of runoff and photovoltaics to perform medium-long term scheduling on a month time scale.
Based on the analysis, in order to coordinate the relationship of hydroelectric power generation and photovoltaic power consumption of a water-light complementary system, the invention provides a method for calculating the photovoltaic power consumption rate of water-light-month complementary, which is used for carrying out water-light-month complementary calculation according to the water-light-day complementary principle by utilizing the capability of a water-light complementary system with annual adjustment and above performances of an annual adjustment reservoir for adjusting the water-light power to adapt to the change of photovoltaic power from day to day by day and adopting the processes of average power of water and electricity, average power of photovoltaic month and average power of solar date, and referring to the patent application No. 202110712306. X. The water-light complementary benefits are considered in the middle-long term scheduling, so that the optimized distribution of the water-light integrated clean energy base water quantity and the electric quantity in the middle-long term period is realized, the synergy between the water power and the photovoltaic is promoted, the overall benefits of the complementary system are optimal as much as possible, and the middle-long term scheduling problem of the water-light complementary system is solved. The method has practical guiding significance for planning and designing the scale of the cascade hydropower station and the photovoltaic installation of the water-light integrated clean energy base and for long-term dispatching operation of the water-light integrated clean energy base.
The technical scheme of the invention is as follows:
a complementary photovoltaic absorption rate calculation method in the water light month based on a clean energy base comprises the following steps:
step A, obtaining a typical weather-year photovoltaic time-by-time average output process, obtaining a step hydropower station month-by-month average output and a unit expected output, and obtaining the maximum transmission capacity of a transmission channel; obtaining the base load output of the cascade hydropower station; calculating the average daily output process of the photovoltaic month, averaging the output of the same period every day in the month to obtain the average daily output process of the photovoltaic month, and recording the average daily output of the photovoltaic month as AGN i The calculation formula is as follows:
GN ji output for the ith period of light Fu Di j days, m being the number of days of one month;
step B, calculating the residual capacity of the power transmission channel, wherein if the output of the current period of the average day of the photovoltaic month is smaller than the residual capacity of the power transmission channel, the photovoltaic absorption of the period is 1 equal to the output of the current period of the photovoltaic, if the output of the current period of the average day of the photovoltaic month is larger than the residual capacity of the power transmission channel, the difference is calculated to obtain the average daily demand adjustment output of the photovoltaic month, and when the output of the current period of the average day of the photovoltaic month is 1 equal to the residual capacity of the power transmission channel, the step C is entered;
step C, calculating average solar water power adjustable output force of the photovoltaic month, wherein the water power adjustable output force is a smaller value of the gradient water power capacity redundancy of the adjustable period and the power transmission channel capacity redundancy, if the average solar water power adjustable output force of the photovoltaic month is smaller than or equal to the water power adjustable output force, the average solar absorption 2 of the photovoltaic month is equal to the average solar water power adjustable output force of the photovoltaic month, and if the average solar water power adjustable output force of the photovoltaic month is larger than the water power adjustable output force, the average solar absorption 2 of the photovoltaic month is equal to the water power adjustable output force;
step D, calculate the light Fu Xiaona rate, light Fu Xiaona rate= (photovoltaic take-up 1+photovoltaic take-up 2)/photovoltaic output.
Adjustable step hydroelectric power KT of ith period i ＝min[N iy -N i ，TD-(AGN i +N i )]，N iy Expected output of step power station for adjustable time period, N i For the step hydroelectric power in the same period, TD is the maximum capacity of a power transmission channel, AGN i Is the photovoltaic output of the same period.
The adjustment capability of the annual adjustment reservoir is utilized to redistribute the power generation flow of the hydropower main flood season for 6-9 months, so that the power output of each month is as uniform as possible, and the generation of waste light caused by the concentrated increase of the power output of the hydropower is avoided.
Calculating photovoltaic daily power generation capacity, photovoltaic month power generation capacity and photovoltaic annual power generation capacity by adopting the photovoltaic average output per hour of typical 365 hours and 8760 hours of meteorological year,
wherein: GN (GN) i Average output in the ith hour of the photovoltaic day; g d The photovoltaic daily power generation amount is the average output summation from time to time within 24 hours in the photovoltaic day; g m The generated energy is light Fu Yue generated energy, and the generated energy is added up day by day in a photovoltaic month; g y The annual energy production is photovoltaic and the total energy production is 12 months.
In step B: residual capacity TDS of transmission channel in each period i ＝TD-N i TD is the maximum transmission capacity of an outgoing channel of a base station; n (N) i The step time average output of the ith period is taken as the step time average output.
The calculation formula of the average solar absorption 1 of photovoltaic month is as follows:
wherein: AGX (AGX) 1i Photovoltaic absorption 1, AGX, which is the ith period 1 The average solar photovoltaic absorption of the total photovoltaic month of the residual channels is 1.
The total value of the photovoltaic output of the photovoltaic month average daily adjustment is equal to the total of the rest photovoltaic in the period of time required to be adjusted:
wherein: AXT i The photovoltaic output to be regulated in the ith period is the photovoltaic output to be regulated, and Ti is the period to be regulated; AXT is the total output of the photovoltaic to be regulated, AGS i For the ith period of residual photovoltaic output AGS i ＝AGN i -AGX 1i NJ is the water-electricity base charge force,
m is the number of hydropower stations.
Average solar photovoltaic absorbed electric quantity GX in photovoltaic month d ＝AGX 1 +AGX 2 The average solar absorption 2 of photovoltaic month is marked as AGX 2 ，
Wherein: AGX (AGX) 2i Is photovoltaic absorption 2 for period i.
Calculating the solar photovoltaic absorbed electric quantity GX m And annual photovoltaic absorbed electric quantity GX y ，
GXm＝(AGX1+AGX2)·m，m＝28,30,31
Monthly photovoltaic absorption rate α=gx m /G m Annual Fu Xiaona rate β=gx y /G y 。
The beneficial effects of the invention are as follows: the invention provides a method for calculating the photovoltaic absorption rate of water-light-month complementation, which is a core innovation point of the invention, for a water-light integrated clean energy base with annual regulation and above performances, the annual regulation reservoir is utilized to have the capacity of regulating the water-electricity output to adapt to the change of photovoltaic output day by day, the water-electricity-month average output and the photovoltaic month average day output processes are adopted, the water-electricity-month electric quantity conservation principle is followed, and the water-light-month complementation calculation is carried out according to the water-light-day complementation calculation principle. By nesting the water-light-month complementary calculation and the medium-long term scheduling of hydropower, the water-light complementary benefit is considered in the medium-long term scheduling of hydropower, the optimized distribution of the water quantity and the electric quantity of the water-light integrated clean energy base in the medium-long term period can be realized, the synergy between hydropower and photovoltaics is promoted, the overall benefit of a complementary system is optimal as much as possible, and the medium-long term scheduling problem of the water-light complementary system is solved.
Drawings
FIG. 1 is a graph showing average water and electricity month output and light Fu Yue absorption rate (perennial) of water and electricity alone dispatch.
FIG. 2 is a graph showing average water and electricity month output and light Fu Yue absorption rate (perennial) of water and light combined dispatching.
Detailed Description
Example 1: fig. 1 shows that a certain water-light complementary clean energy base hydropower station operates according to self-optimized scheduling, and the average power output of the hydropower station is large in 7 months and 9 months, so that the hydropower station occupies a photovoltaic power generation space, and the 7 months and the 9 months have light rejection. The electricity quantity per year of water and electricity is 427.2 hundred million kWh, the annual photovoltaic absorption rate is 91.7%, the annual photovoltaic absorption quantity of electricity is 153.9 hundred million kWh, and the total electricity quantity per year of the base is 581.1 hundred million kWh.
In the embodiment, the water and electricity long-term scheduling operation and the water and light month complementation meter are nested, the water and light complementation benefit is considered in the water and electricity long-term scheduling, the maximum total electric quantity of the water and light complementation is taken as a target, the reservoir water level constraint, the power generation flow constraint, the installed capacity constraint and the water balance constraint of the step water and electricity scheduling are followed, the adjustment capacity of the annual adjustment reservoir is utilized, the water and electricity non-water abandonment principle is taken as a base water and electricity, the power generation flow and the electric energy generation capacity in the water and electricity flood period are redistributed, and the photovoltaic is absorbed as much as possible. FIG. 2 shows that in the year of water, the water power generation flow rate of the base water power is regulated by using a year regulating reservoir, the power generation output is reduced by 7 months and 9 months after the power generation output is properly increased by 6 months and 8 months, and the photovoltaic absorption rate can reach 100%. The annual electricity quantity of water and electricity is 425.3 hundred million kWh, the annual photovoltaic absorbed electricity quantity is 167.8 hundred million kWh, and the total network electricity quantity of the base is 593.1 hundred million kWh.
The calculation method comprises the following steps:
step A, obtaining a typical weather-year photovoltaic time-by-time average output process, obtaining a step hydropower station month-by-month average output and a unit expected output, and obtaining the maximum transmission capacity of a transmission channel; obtaining the base load output of the cascade hydropower station;
and carrying out hydro-optic complementary calculation according to the hydro-optic month average output and the photovoltaic month average day-by-day time-by-time output process, wherein the calculation period is 1h.
With the average water and electricity month output as the time average output N i 。
Calculating photovoltaic daily power generation capacity, photovoltaic month power generation capacity and photovoltaic annual power generation capacity by adopting typical 365-day 8760-hour photovoltaic average output of meteorological year:
wherein: GN (GN) i Average output in the ith hour of the photovoltaic day; g d The photovoltaic daily power generation amount is the average output summation from time to time within 24 hours in the photovoltaic day; g m The generated energy is light Fu Yue generated energy, and the generated energy is added up day by day in a photovoltaic month; g y The annual energy production is photovoltaic and the total energy production is 12 months.
And B, calculating the average daily output and the residual capacity of the power transmission channel. And (3) averaging the photovoltaic output within the same period every day in a month to obtain a photovoltaic month average day-by-day output process, and recording the photovoltaic month average day-by-day output as AGNi, AGNi= ΣGNji/m. Wherein GNji is the output of the j-th day and i-th period, m is the number of days in month, and m=28, 30 and 31.
And C, if the output of the current period of the average day of the photovoltaic month is smaller than the residual capacity of the power transmission channel, the photovoltaic absorption 1 is equal to the output of the current period of the time, and if the output of the current period of the average day of the photovoltaic month is larger than the residual capacity of the power transmission channel, calculating a difference value to obtain the average required regulating power of the photovoltaic month, and entering the step C.
Residual capacity TD of power transmission channel per time period si ＝TD-N i TD is the maximum transmission capacity of an outgoing channel of a base station; n (N) i The step time average output of the ith period is taken as the step time average output.
The average solar absorption 1 of the photovoltaic month is marked as AGX1,
wherein: AGX1 is photovoltaic absorption at period i and AGX1 is the average daily absorption of photovoltaic months using the remaining channels 1.
The total value of the photovoltaic output of the photovoltaic month average daily adjustment is equal to the total of the rest photovoltaic in the period of time required to be adjusted:
wherein: AXT i The output of the photovoltaic month average day period to be regulated in the ith period is the output of the photovoltaic month average day period to be regulated in the ith period, and Ti is the period to be regulated; AXT is the average daily total output of photovoltaic month, AGS, which needs to be regulated i For the i-th moment remaining photovoltaic output AGS i ＝AGN i -AGX 1i NJ is the water-electricity base charge force,
(M is the number of hydropower stations).
Step C, calculating a hydropower adjustable output, wherein the hydropower adjustable output is a smaller value of the gradient hydropower capacity redundancy of the adjustable period and the power transmission channel capacity redundancy, if the photovoltaic required output is smaller than or equal to the hydropower adjustable output, the average daily absorption of 2 in the photovoltaic month is equal to the photovoltaic required output, and if the photovoltaic required output is larger than the hydropower adjustable output, the average daily absorption of 2 in the photovoltaic month is equal to the hydropower adjustable output;
adjustable step hydroelectric power KT of ith period i ＝min[N iy -N i ，TD-(AGN i +N i )]，N iy Expected output of step power station for adjustable time period, N i Is the step hydroelectric power with the same period, TD is the maximum capacity of a power transmission channel, AGN i Is the photovoltaic output of the same period.
Wherein: AGX (AGX) 2i Is the photovoltaic consumption of the ith period of the average day of the photovoltaic month, and DGX2 is the total remaining photovoltaic consumption of the average day of the photovoltaic month 2.
Step D, calculating the lunar photovoltaic power consumption and the lunar photovoltaic absorption rate
The monthly photovoltaic power absorption capacity is GXm, and is the average daily power absorption capacity of the photovoltaic month multiplied by the number of days of the month. The calculation formula is as follows:
GXm＝(AGX1+AGX2)·m
where m is the number of days of one month, and m=28, 30, 31.
The monthly photovoltaic absorption rate is marked as alpha, and is the ratio of the current month photovoltaic absorption electric quantity to the current month photovoltaic power generation quantity. Alpha= GXm/Gm
Step F, calculating annual photovoltaic power consumption
The annual photovoltaic absorbed electricity quantity is recorded as GX, and is the sum of the photovoltaic absorbed electricity quantity in each month. The calculation formula is as follows:
step G, calculating the annual light Fu Xiaona rate
The annual photovoltaic power consumption rate is recorded as beta and is the ratio of annual photovoltaic power consumption quantity to annual photovoltaic power quantity.
The calculation formula is as follows: beta=gx y /G y 。
Example 2: for a further understanding of the present invention, its aspects, features and advantages, reference is now made to the following examples, which are described in detail below:
taking a certain water-light complementary clean energy base as an example, the invention takes a base cascade hydropower station as an example, and the top-down installed capacity and the adjustment performance of the base cascade hydropower station are respectively as follows: first stage 150 ten thousand kW, daily regulation; the second stage is 260 kW, and annual adjustment is carried out; third stage 72 kW, daily regulation; fourth stage 210 kW, daily regulation; fifth stage 40.5 kW, daily regulation; sixth grade 220 kW, quaternary regulation, base station hydropower cascade total assembly machine capacity 952.5 kW, and base station photovoltaic total scale 1000 kW. The maximum transmission capacity of the base transmission channel is 1000 ten thousand kW.
The specific implementation steps are as follows:
step one, obtaining an average output process of 1000 ten thousand kW photovoltaic typical meteorological year photovoltaic 365 days 8760 hours by time; and obtaining the month-by-month average output of the cascade hydropower station and the expected output of the unit, and the base load output of the cascade hydropower station.
And step two, calculating photovoltaic solar energy generation capacity, photovoltaic lunar energy generation capacity and photovoltaic annual energy generation capacity. Calculation of photovoltaic average out force from time to time was performed using a typical meteorological year 365 days 8760 hours.
The method specifically comprises the following steps:
wherein: GN (GN) i Average output for ith hour of photovoltaic dayThe method comprises the steps of carrying out a first treatment on the surface of the Gd is the photovoltaic daily power generation amount and is the average output summation from time to time within 24 hours in the photovoltaic day. G m The generated energy of the light Fu Yue is the total generated energy of the photovoltaic month day by day. G y The annual energy production is photovoltaic and the total energy production is 12 months. The results of the monthly power generation and annual power calculation are shown in Table 3.
Step three, calculating the average daily time-by-time output of photovoltaic month
And averaging the output of the same period every day in the month to obtain the average daily and time-by-time output process of the photovoltaic month. The method specifically comprises the following steps:
wherein: AGNi is output of photovoltaic month at the ith period and GN ji For the j-th day i-th period of photovoltaic output, m is the number of days of a month (28, 30, 31)
And step four, calculating the capacity of the residual power transmission channel.
The method specifically comprises the following steps:
the residual capacity of the power transmission channel of the base is equal to the maximum power transmission capacity of the power transmission channel of the base minus the step time average output, and the step month average output is taken as the step time average output, which comprises the following steps:
TD si ＝TD-N i
wherein: TD (time division) si Channel capacity remaining for the daily i-th period base; TD is the maximum transmission capacity of an outgoing channel of a base, and is 1000 ten thousand kW; n (N) i The step time average output of the ith period is taken as the step time average output.
And fifthly, calculating the average daily absorption 1 of the photovoltaic month.
The method specifically comprises the following steps:
when the output of the photovoltaic month in the current period is smaller than or equal to the capacity of the residual power transmission channel in the step four, the output of the current period can be completely absorbed by the residual channel, and when the output of the photovoltaic month is larger than the capacity of the residual channel in the step four, the absorbed photovoltaic output of the current period is equal to the capacity of the residual power transmission channel, and the method specifically comprises the following steps:
wherein: AGX (AGX) 1i Is photovoltaic absorption of the ith period of the current day, and AGX1 is average daily absorption of 1 of the total photovoltaic months of the remaining channels utilized on the current day.
And step six, calculating the average daily absorption of the photovoltaic month by 2.
The method specifically comprises the following steps:
(1) Calculation of force to be adjusted
The remaining photovoltaic month average time-by-time output can be utilized to adjust the water and electricity output process by utilizing the reservoir capacity of the cascade power station, the water and electricity output is reduced through reservoir water storage, the photovoltaic output is absorbed by the yielding channel, and the corresponding time period is called as a time period needing adjustment, and is called as a time period needing adjustment for short. The photovoltaic power output to be regulated is smaller than or equal to the difference value between the hydroelectric power output and the base power output in the current period.
The total value of the photovoltaic output force to be regulated is equal to the total of the rest photovoltaic in the period to be regulated, and the photovoltaic output force to be regulated is called for short;
wherein: AXT i The photovoltaic output to be regulated in the ith period is the photovoltaic output to be regulated, and Ti is the period to be regulated; AXT is the total output of the photovoltaic to be regulated, AGS i AGS for the remaining photovoltaic output at time i i ＝AGN i -AGX 1i NJ is the water-electricity base charge force,
(M is the number of hydropower stations).
(2) Adjustable output calculation
In order to increase the step hydroelectric power which is reduced in the period of time when the photovoltaic power is consumed, the power is increased in other periods of time so that the total of the one-day hydroelectric power is unchanged, and the balance of the step hydroelectric daily power is maintained. The period of increasing the step hydro-power output is referred to as an adjustable period, simply referred to as an adjustable period. The increased step force is referred to as a hydropower adjustable force.
The hydropower adjustable force is the sum of the gradient hydropower capacity redundancy of the adjustable time period and the transmission channel capacity redundancy taking a small value. The step hydropower station with the step hydropower capacity redundancy equal to the adjustable time interval is expected to output minus the step hydropower output in the same time interval, and the power transmission channel capacity redundancy is equal to the maximum capacity of the power transmission channel in the adjustable time interval minus the water light superposition output in the same time interval.
KT i ＝min[N iy -N i ，TD-(AGN i +N i )]
Wherein: KT is the adjustable step total hydroelectric power, KT i Is the adjustable step hydroelectric power of the ith period, T 2 For adjustable period of time N iy Is the expected output of the step power station in the i-th period.
(3) Photovoltaic absorption GX2 calculation
When the hydropower adjustable force is larger than the required adjustment, the photovoltaic absorption AGX 2 =need to regulate out force
When the hydropower adjustable force is smaller than the required adjustment, the photovoltaic absorption AGX 2 Water and electricity adjustable output
Wherein: AGX (AGX) 2i Is the photovoltaic absorption of the i-th period, AGX2 is the total remaining photovoltaic absorption of the day.
And seventhly, calculating the absorption quantity and the absorption rate of the lunar photovoltaic.
The method specifically comprises the following steps:
GXm＝(AGX1+AGX2)·m
wherein GXm is the solar photovoltaic power absorbed in the month, the average solar photovoltaic power absorbed in the month is multiplied by the number of days in the month, m is the number of days in one month, and m=28, 30 and 31.
α＝GXm/Gm
Wherein alpha is the absorption rate of the photovoltaic in the month, and is the ratio of the absorbed electricity quantity of the photovoltaic in the month to the electricity generation quantity of the photovoltaic in the month. Gm photovoltaic month generating capacity.
And step eight, annual photovoltaic power absorption and annual photovoltaic power absorption rate calculation.
The method specifically comprises the following steps:
wherein GXy is the annual photovoltaic power consumption, which is the total of 12 months of photovoltaic power consumption in the year
β＝GXy/Gy
Wherein, beta is the annual light Fu Xiaona rate and is the ratio of annual photovoltaic absorbed electricity quantity to photovoltaic annual energy production. Gy is the photovoltaic annual energy production.
Taking a plain year as an example, if the base hydropower station operates in a mode of maximum electric quantity of the base hydropower station alone, the electric quantity of the base hydropower station is 427.2 hundred million kWh, the water power output is large in 7 months and 9 months, the base hydropower station occupies a photovoltaic output channel, the light is abandoned in 7 months and 9 months, the electric quantity absorbed by the base hydropower station in the photovoltaic year is 153.9 hundred million kWh, and the photovoltaic absorption rate is 91.7%. The total electricity quantity of the base is 581.1 hundred million kWh. The calculation results are shown in Table 1.
TABLE 1 Water-light complementary calculation results Table for Water-electricity independent scheduling of certain clean energy base
The second step of the base has annual adjustment capability, and is a control engineering for the complementary scheduling operation of the base water and light. The second step year is utilized to adjust reservoir functions, the maximum total electric quantity of water-light complementation is used as a target, reservoir water level constraint, power generation flow constraint, installation capacity constraint and water balance constraint of step hydropower dispatching are followed, the base hydropower is used as a principle that water is not abandoned, power generation flow and power generation capacity in 6-9 months in the flood season are adjusted, power generation output in 6-8 months is properly increased, power generation output in 7-9 months is reduced, photovoltaic absorption is increased as much as possible, long-term dispatching and water-light complementation calculation nesting of hydropower are carried out, a water-light joint dispatching scheme in the step hydropower station with the maximum total electric quantity of the base is obtained, the corresponding photovoltaic absorption rate reaches 100%, the photovoltaic power supply capacity is 167.8 hundred million kWh, the hydropower supply capacity is 425.3 hundred million kWh, and the total electric quantity of the base is 593.12 hundred million kWh. The calculation results are shown in Table 2
TABLE 2 Water-light complementary calculation results Table of Joint scheduling of Water-light complementary systems of clean energy base
As can be seen from the comparison table of the calculation results of the table 3, compared with the independent water and electricity scheduling, the water and electricity complementary benefits are considered in the middle-long term scheduling by the water and light combined scheduling of the water and light complementary calculation and the middle-long term scheduling nesting of the water and electricity, the photovoltaic absorption rate is as high as 100% from 91.7%, the photovoltaic absorption capacity is increased by 13.9 hundred million kWh, the water and electricity combined scheduling of the water and light system is reduced by 1.9 hundred million kWh, the total on-line electric quantity of the base is increased by 12 hundred million kWh, the optimal distribution of the water and light integrated clean energy base water quantity and electric quantity in the middle-long term period is further realized, the overall benefit of the complementary system is as optimal as possible, and the middle-long term scheduling problem of the water and light complementary system is solved.
TABLE 3 comparison of results of the Water-light complementary calculations of the Water-Power independent dispatch and Water-light Joint dispatch of the base station
Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the appended claims, which are within the scope of the present invention.
Claims (9)
1. A complementary photovoltaic absorption rate calculation method based on clean energy base water light month is characterized by comprising the following steps:
step A, obtaining a typical weather-year photovoltaic time-by-time average output process, obtaining a step hydropower station month-by-month average output and a unit expected output, and obtaining the maximum transmission capacity of a transmission channel; obtaining the base load output of the cascade hydropower station; calculating the average daily output process of the photovoltaic month, averaging the output of the same period every day in the month to obtain the average daily output process of the photovoltaic month, and recording the average daily output of the photovoltaic month as AGN i The calculation formula is as follows:
GN ji output for the ith period of light Fu Di j days, m being the number of days of one month;
step B, calculating the residual capacity of the power transmission channel, wherein if the output of the current period of the average day of the photovoltaic month is smaller than the residual capacity of the power transmission channel, the photovoltaic absorption of the period is 1 equal to the output of the current period of the photovoltaic, if the output of the current period of the average day of the photovoltaic month is larger than the residual capacity of the power transmission channel, the difference is calculated to obtain the average daily demand adjustment output of the photovoltaic month, and when the output of the current period of the average day of the photovoltaic month is 1 equal to the residual capacity of the power transmission channel, the step C is entered;
step C, calculating average solar water power adjustable output force of the photovoltaic month, wherein the water power adjustable output force is a smaller value of the gradient water power capacity redundancy of the adjustable period and the power transmission channel capacity redundancy, if the average solar water power adjustable output force of the photovoltaic month is smaller than or equal to the water power adjustable output force, the average solar absorption 2 of the photovoltaic month is equal to the average solar water power adjustable output force of the photovoltaic month, and if the average solar water power adjustable output force of the photovoltaic month is larger than the water power adjustable output force, the average solar absorption 2 of the photovoltaic month is equal to the water power adjustable output force;
step D, calculate the light Fu Xiaona rate, light Fu Xiaona rate= (photovoltaic take-up 1+photovoltaic take-up 2)/photovoltaic output.
2. The clean energy base water light month complementary-based photovoltaic absorption rate calculation method according to claim 1, wherein the method comprises the following steps of: adjustable step hydroelectric power KT of ith period i ＝min[N iy -N i ，TD-(AGN i +N i )]，N iy Expected output of step power station for adjustable time period, N i For the step hydroelectric power in the same period, TD is the maximum capacity of a power transmission channel, AGN i Is the photovoltaic output of the same period.
3. The clean energy base water light month complementary-based photovoltaic absorption rate calculation method according to claim 2, wherein the method comprises the following steps of: the adjustment capability of the annual adjustment reservoir is utilized to redistribute the power generation flow of the hydropower main flood season for 6-9 months, so that the hydropower output process is as uniform as possible, and the generation of waste light caused by the concentrated increase of the hydropower output is avoided.
4. The method for calculating the complementary photovoltaic absorption rate in the water light month based on the clean energy base according to claim 3, wherein the method comprises the following steps of: calculating photovoltaic daily power generation capacity, photovoltaic month power generation capacity and photovoltaic annual power generation capacity by adopting the photovoltaic average output per hour of typical 365 hours and 8760 hours of meteorological year,
wherein: GN (GN) i Average output in the ith hour of the photovoltaic day; g d The photovoltaic daily power generation amount is the average output summation from time to time within 24 hours in the photovoltaic day; g m The generated energy is light Fu Yue generated energy, and the generated energy is added up day by day in a photovoltaic month; g y The annual energy production is photovoltaic and the total energy production is 12 months.
5. The method for calculating the complementary photovoltaic absorption rate in the water light month based on the clean energy base according to claim 4, wherein in the step B: residual capacity TDS of transmission channel in each period i ＝TD-N i TD is the maximum transmission capacity of an outgoing channel of a base station; n (N) i The step time average output of the ith period is taken as the step time average output.
6. The method for calculating the complementary photovoltaic absorption rate in the water light month based on the clean energy base according to claim 5, wherein the method comprises the following steps of: the calculation formula of the average solar absorption 1 of photovoltaic month is as follows:
wherein: AGS (AGS) 1i Photovoltaic absorption 1, AGX, which is the ith period 1 The average solar photovoltaic absorption of the total photovoltaic month of the residual channels is 1.
7. The method for calculating the complementary photovoltaic absorption rate in the water light month based on the clean energy base according to claim 6, wherein the total value of the photovoltaic output required to be regulated on average in the photovoltaic month is equal to the total of the rest photovoltaic in the required regulation period:
wherein: AXT i The photovoltaic output to be regulated in the ith period is the photovoltaic output to be regulated, and Ti is the period to be regulated; AXT is the total output of the photovoltaic to be regulated, AGS i For the ith period of residual photovoltaic output AGS i ＝AGN i -AGX 1i NJ is the water-electricity base charge force,
m is the number of hydropower stations.
8. The clean energy base water light month complementary-based photovoltaic absorption rate calculation method according to claim 7, wherein the method comprises the following steps of: average solar photovoltaic absorbed electric quantity GX in photovoltaic month d ＝AGX 1 +AGX 2 The average solar absorption 2 of photovoltaic month is marked as AGX 2 ，
Wherein: AGS (AGS) 2i Is photovoltaic absorption 2 for period i.
9. The clean energy base water light month complementary-based photovoltaic absorption rate calculation method according to claim 8, wherein the method comprises the following steps of: calculating the solar photovoltaic absorbed electric quantity GX m And annual photovoltaic absorbed electric quantity GX y ，
GXm＝(AGX1+AGX2)·m，m＝28,30,31
Monthly photovoltaic absorption rate α=gx m /G m Annual Fu Xiaona rate β=gx y /G y 。
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| CN117081175B (en) * | 2023-10-12 | 2023-12-29 | 中国电建集团贵阳勘测设计研究院有限公司 | Water, wind and light storage integrated foundation power production simulation method |
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