CN117293927B - Extraction and storage working capacity determining method based on reliable electric quantity support - Google Patents
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Abstract
The invention provides a pumping and accumulating working capacity determining method based on reliable electric quantity support, and belongs to the technical field of power system planning. The invention is divided into four steps, the general content of each step is that the first step is mainly to calculate the boundary condition definitely, the second step is to definitely new energy output and hydropower adjustable average output, the third step is to presume and draw and hold, preliminary capacity balance of the working capacity of the thermal power, the fourth step is to draw and hold and can draw the electric quantity and calculate of the electric energy generation requirement. The invention comprehensively considers the factors such as reliable electric power support of electric power load, new energy absorption, reliable pumping electricity quantity of pumping electricity generation and the like, can reasonably determine pumping electricity working capacity, simultaneously determines thermal power working capacity and minimum starting capacity, provides a reasonable and accurate method for electric power quantity balance calculation, and further provides reliable data for electric power system planning design, reasonable scale demonstration of pumping electricity storage power stations, power station benefit analysis and the like.
Description
Technical Field
The invention belongs to the technical field of power system planning, and particularly relates to a pumping and accumulating working capacity determining method based on reliable electric quantity support.
Background
The pumped storage power station is a energy storage form which can be developed in a large scale, is green, low-carbon, safe and environment-friendly, can provide effective power for a system in a corresponding scale, can provide the capability of storing and flexibly adjusting for high-proportion and high-quality development new energy, reduces the wind-solar energy rejection rate of the system, improves the operation condition of thermal power, and is an objective requirement for development of a novel power system.
The operation mode of the pumped storage power station mainly pumps water when the power system is abandoned or in a valley period, and provides power for the system in a peak period of the system, and the provided power needs stable electric quantity support as a premise. Under the requirement of safe and stable operation of the power system, the capacity benefit of the pumped storage power station in the power system depends on whether the system electric quantity is enough and stable, and the intermittent, random and fluctuation characteristics of new energy indicate that the capacity of the pumped storage power station is not stable enough in a short period, and the capacity supporting function of the pumped storage power station needs stable power sources such as thermal power, hydropower and the like to provide the electric quantity. The working capacity of the pumped storage power station is the concrete embodiment of the capacity supporting function, the determination of the working capacity is important in the calculation of the electric power and electric quantity balance, the working capacity is a basic premise of the scale demonstration and benefit analysis of the pumped storage power station, and the rationality of the determination method has important significance for the planning and design of an electric power system. However, the current research rarely provides a method for determining the working capacity of a pumped storage power station in an electric power system, and particularly in the current calculation research of the electric power and electric quantity balance of a novel electric power system, a reasonable method for determining the working capacity of the pumped storage power station is lacking.
Based on the characteristics of the current novel power system, the invention provides a pumped storage power station working capacity determining method based on reliable electric quantity support by taking safe and stable operation of the power system as a requirement.
Disclosure of Invention
The invention aims to provide a pumping and accumulating working capacity determining method based on reliable electric quantity support, which comprehensively considers factors such as reliable electric quantity support of electric load, new energy absorption, reliable pumping and accumulating power generation and the like, can reasonably determine pumping and accumulating working capacity, simultaneously determines thermal power working capacity and minimum starting capacity, provides a reasonable and accurate method for electric quantity balance calculation, and further provides reliable data for electric system planning and design, reasonable scale demonstration of pumping and accumulating power stations, power station benefit analysis and the like.
The technical scheme of the invention is as follows: a pumping and accumulating working capacity determining method based on reliable electric quantity support comprises the following steps:
the first step: the electric power and electric quantity balance takes a month as a balance period, the capacity requirement of the month is analyzed by the maximum load day in the month, and the boundary condition is defined;
and a second step of: according to the output characteristics of new energy in a power system in a month, taking a typical daily output process of the new energy with a certain electric quantity guarantee rate in the month as a maximum load daily new energy output process, and calculating a maximum load daily hydropower adjustable average output;
and a third step of: the method comprises the steps of assuming that the pumping and accumulating working capacity and the thermal power working capacity are subjected to capacity preliminary balance, and determining the balance positions of various power supplies;
fourth step: according to the maximum load daily load process and the maximum load daily new energy output process, obtaining a maximum load daily residual load, calculating the extractable electric quantity of the extraction and the required electric quantity of the extraction and storage according to the balance positions of various power supplies and the maximum load daily residual load, judging whether the extractable electric quantity of the extraction and storage is equal to the required electric quantity of the extraction and storage after conversion according to the conversion efficiency, if so, determining that the assumed extraction and storage working capacity and the thermal power working capacity of the step three are reasonable, obtaining the minimum starting capacity of the thermal power, and if not, returning to the step three, and re-assuming the extraction and storage working capacity and the thermal power working capacity until the reasonable extraction and storage working capacity is determined.
Further, in the first step, in the electric power and electric quantity balance, taking a month as a balance period, and analyzing the capacity requirement of the month by using the day of maximum load in the month; the capacity requirement comprises maximum load, load reserve and accident reserve, the load reserve and the accident reserve are expressed by reserve rates, and the formula is as follows:
；
wherein: n (N) d Is the capacity requirement, kW; l (L) max Maximum load, kW; gamma ray 1 The load reserve rate is used; gamma ray e The accident reserve rate is the accident reserve rate;
the clear boundary condition is that the standby arrangement proportion of various power supplies is clear according to the standby bearing arrangement strategy of various power supplies in the power system, and the sum of the standby capacities of various power supplies is equal to the load standby capacity of the power system; wherein the spare capacity of the load born by the thermal power is N T,1 kW; the spare capacity of accident load borne by thermal power is N T,e kW; the water and electricity working capacity is N H，w kW; the hydropower working capacity is the hydropower installation capacity minus the hydropower overhaul capacity, the hydropower load reserve capacity, the accident reserve capacity and the hydropower blocking capacity.
Further, the average output force of the solar water power adjustable maximum load is calculated according to the following formula:
；
in the method, in the process of the invention,the average output power for maximum load day water power can be adjusted, kW; />Average power of water, electricity and month in runoff regulation results is kW; n (N) H,b The power is applied to the water-electricity base charge, and kW; n (N) H,b Is a single machine of a hydropower stationAnd (3) stably operating the minimum output and the maximum value in the ecological base load, and kW.
Further, the third step is to divide the hydropower working capacity into hydropower base charge output and hydropower adjustable capacity, and the formula is as follows:
；
wherein N is H,a The capacity is adjustable for hydropower, kW;
the sum of the thermal power working capacity and the pumping and accumulating working capacity is determined, and the formula is as follows:
；
wherein N is T,w The working capacity of the thermal power is kW; n (N) P,w The working capacity is pumping and accumulating, and kW;
the method comprises the steps of respectively assuming pumping and accumulating working capacity and thermal power working capacity, carrying out preliminary capacity balance on the load of the maximum load day in a month, utilizing the power supply working capacity to preferentially utilize hydropower and pumping and accumulating, and finally utilizing thermal power to determine that the capacity balance positions of various power supplies on the maximum load day are hydropower base load, thermal power working capacity, hydropower adjustable capacity and pumping and accumulating working capacity from bottom to top in sequence; and then respectively obtaining the lower limit and the upper limit positions of various power supplies in capacity balance, wherein the formulas are as follows:
；
；
；
；
；
；
wherein: p (P) T,d And P T,u Respectively the lower limit and the upper limit of the thermal power in the capacity balance, and kW; p (P) H,d And P H，u The lower limit and the upper limit of the water and electricity in the capacity balance are respectively kW; p (P) P,d And P P,u The lower limit and the upper limit of the drawing and accumulating in the capacity balance are respectively kW.
Further, the fourth step is to obtain the daily residual load of the maximum load according to the daily electric load of the maximum load and the daily new energy output of the maximum load, and the formula is as follows:
；
wherein L is i,r The residual load at the ith moment of the maximum load day, kW; l (L) i The power load at the ith moment of the maximum load day, kW; n (N) i,s&w The new energy output at the ith moment of the maximum load day is kW;
after the output of the new energy source with the maximum load day is considered, the required power generation amount in the hydropower adjustable capacity range is the power quantity of the residual load with the maximum load day in the hydropower adjustable capacity range, and the formula is as follows:
；
wherein: x is X i For the first conversion variable, E H,a,need The power generation amount is required in the hydropower capacity adjustable range, and kWh is calculated;
the water-electricity surplus and shortage electric quantity is obtained according to the water-electricity adjustable electric quantity and the required electric quantity in the water-electricity adjustable capacity range, and the formula is as follows:
；
wherein: e (E) H,y&k kWh is the surplus and deficient electric quantity of water and electricity;
if E H,y&k <0, indicating that the hydropower adjustable electric quantity is insufficient to fill the maximum daily residual load in the hydropower adjustable capacity range, and the electricity needs to be pumped and stored for power generation to supplement the shortage electric quantity-E H,y&k The formula is as follows:
；
wherein: e (E) P-H The water-electricity shortage electric quantity which needs to be pumped and stored is supplied, and kWh;
if E H,y&k >0, indicating that the hydropower adjustable electric quantity is in the hydropower adjustable capacity range, and the residual electric quantity is used for supplementing, storing and pumping after the residual load of the maximum load day is filled;
according to the maximum load solar thermal power available pumping and storing pumping power, the thermal power available pumping and storing pumping power is calculated, and the formula is as follows:
；
；
wherein: n (N) i,T-P The thermal power at the ith moment of the maximum load day can be used for pumping and storing pumping power, and the power consumption is kW; e (E) T-P Pumping electricity for the thermal power supply and storage and kWh;
the water power supply, the water storage and the water pumping electric quantity are calculated by two parts, wherein one part is calculated by L i，r >P H,d The formula is as follows:
；
another part, if L i，r ≤P H,d The formula is as follows:
；
wherein: y is Y i As a second conversion variable, Z i As a third conversion variable E H-P,1sp Supplying and storing water pumping electric quantity for the first part of water and electricity, and kWh; e (E) H-P,2sp Supplying and storing pumping electricity quantity for the second part of water and electricity, and kWh;
the water and electricity surplus and shortage electric quantity is combined to calculate the water and electricity available pumping and storing electric quantity, and the formula is as follows:
；
wherein: e (E) H-P The water power can be supplied to the hydropower station for storing and pumping water power, and kWh;
and calculating the power generation amount required by pumping and accumulating by combining the daily residual load of the maximum load, wherein the formula is as follows:
；
wherein: n (N) i For the fourth conversion variable, E P kWh is used for pumping and accumulating the required power generation;
judging whether the thermal power and hydroelectric power available pumping and storage pumping electricity quantity is equal to the pumping and storage required electricity generation quantity after considering the conversion efficiency according to the conversion efficiency beta, namely E P Whether or not equal to beta (E T-P +E H-P ) The method comprises the steps of carrying out a first treatment on the surface of the If the thermal power is equal to the minimum starting capacity, the working capacity of the pumping and accumulating and the working capacity of the thermal power which are assumed in the third step are determined to be reasonable, and the minimum starting capacity of the thermal power is obtained, and the formula is as follows:
；
wherein: n (N) T,o The minimum starting capacity is the thermal power, kW;
if not, returning to the third step to presume the pumping and storage working capacity and the thermal power working capacity again until the reasonable pumping and storage working capacity and the thermal power working capacity are determined.
Advantageous effects
The drawing and accumulating working capacity determining method based on the reliable electric quantity support is innovative in perspective, clear in method thought and clear in calculation formula, the drawing and accumulating working capacity is quite compatible with the operation of a drawing and accumulating power station from the perspective that the reliable electric quantity is used as the support, meanwhile, the calculation method determines the minimum starting capacity of the thermal power while determining the drawing and accumulating working capacity, accuracy, rationality and accuracy of electric power quantity balance calculation are improved, and guidance can be provided for determining the starting capacity of the thermal power for electric power dispatching of an electric power system. The method of the invention fills the blank of the method for determining the pumping and accumulating working capacity by taking the reliable electric quantity as the support in the electric power and electric quantity balance calculation of the current novel electric power system, can be applied to the fields of electric power system planning and design, power source scale demonstration, benefit analysis and the like, and has wide application prospect.
Drawings
FIG. 1 is a schematic representation of the general concepts and steps of the present invention;
FIG. 2 is a schematic diagram showing the capacity balance of each power supply during the balancing period for the maximum load day;
fig. 3 is a conceptual diagram of the amount of power that can be extracted and stored, and the amount of power that is required for extraction and storage.
Detailed Description
An embodiment is a pumping and accumulating working capacity determining method based on reliable electric quantity support.
The method starts from the safe and stable operation requirement of the electric power system, the electric power balance takes a month as a balance period, and under the premise of meeting the system capacity requirement and the water and electricity scale determination, the size of the available pumping electric power in the electric power system is analyzed under the premise of certain assumed pumping and storage working capacity and thermal power working capacity when the new energy is continuously smaller, namely the electric power is smaller, aiming at the maximum load day in the month, and the effective electric power support load can be supported by the available pumping and storage working capacity after the efficiency conversion of the pumping and storage power station.
According to the scheme, the method can be divided into four steps, namely the following steps:
the first step: the electric power and electric quantity balance takes a month as a balance period, the capacity requirement of the month is analyzed by the maximum load day in the month, and the boundary condition is defined;
and a second step of: according to the output characteristics of new energy in the power system in the month, taking a typical sunrise process of the new energy in the month as a maximum load day new energy output process according to the electric quantity guarantee rate, and calculating a maximum load day hydropower adjustable average output;
and a third step of: the method comprises the steps of assuming that the pumping and accumulating working capacity and the thermal power working capacity are subjected to capacity preliminary balance, and determining the balance positions of various power supplies;
fourth step: according to the maximum load daily load process and the maximum load daily new energy output process, obtaining a maximum load daily residual load, calculating the extractable electric quantity of the extraction and the required electric quantity of the extraction and storage according to the balance positions of various power supplies and the maximum load daily residual load, judging whether the extractable electric quantity of the extraction and storage is equal to the required electric quantity of the extraction and storage after conversion according to the conversion efficiency, if so, determining that the assumed extraction and storage working capacity and the thermal power working capacity of the step three are reasonable, obtaining the minimum starting capacity of the thermal power, and if not, returning to the step three, and re-assuming the extraction and storage working capacity and the thermal power working capacity until the reasonable extraction and storage working capacity is determined.
A brief flow chart of the above steps may be referred to in fig. 1.
The following is a specific embodiment with reference to fig. 2 and 3:
the first step is that in the electric power and electric quantity balance, taking a month as a balance period, analyzing the capacity requirement of the month by using the day of maximum load in the month; the capacity requirement comprises maximum load, load reserve and accident reserve, the load reserve and the accident reserve are expressed by reserve rates, and the formula is as follows:
；
wherein: n (N) d Is the capacity requirement, kW; l (L) max Maximum load, kW; gamma ray 1 Taking 3% for the load reserve rate; gamma ray e Taking 10% of the accident reserve rate;
the clear boundary condition is based on the backup bearing safety of various power supplies in the power systemThe arrangement strategy is used for defining the standby arrangement proportion of various power supplies, and the sum of the standby capacities of the various power supplies is equal to the load standby capacity of the power system; wherein the spare capacity of the load born by the thermal power is N T,1 kW; the spare capacity of accident load borne by thermal power is N T,e kW; the water and electricity working capacity is N H，w kW; the hydropower working capacity is the hydropower installation capacity minus the hydropower overhaul capacity, the hydropower load reserve capacity, the accident reserve capacity and the hydropower blocking capacity. Wherein, various power supplies are hydroelectric power, thermal power, pumping storage and other power supplies.
In the second step, the daily electricity guarantee rate in a month is 95%, and the daily new energy output with the maximum load is obtained. The new energy source refers to wind power, photovoltaic and the like in the electric power system.
The average power output of the solar water heater with the maximum load can be adjusted by calculating the formula as follows:
；
in the method, in the process of the invention,the average output power for maximum load day water power can be adjusted, kW; />Average power of water, electricity and month in runoff regulation results is kW; n (N) H,b The power is applied to the water-electricity base charge, and kW; n (N) H,b The method is the minimum output of the stable operation of a single machine of the hydropower station and the maximum value in ecological base load, and kW. Alpha is a coefficient according to the water and electricity regulation capability, alpha is 1 if water and electricity are daily regulation and below, and alpha is 1.0-1.3 if water and electricity are quaternary regulation and above. This step α takes 1.
The third step is to divide the hydropower working capacity into hydropower base charge output and hydropower adjustable capacity, and the formula is as follows:
；
wherein N is H,a The capacity is adjustable for hydropower, kW;
the sum of the thermal power working capacity and the pumping and accumulating working capacity is determined, and the formula is as follows:
；
wherein N is T,w The working capacity of the thermal power is kW; n (N) P,w The working capacity is pumping and accumulating, and kW;
the method comprises the steps of respectively assuming pumping and accumulating working capacity and thermal power working capacity, carrying out preliminary capacity balance on the load of the maximum load day in a month, utilizing the power supply working capacity to preferentially utilize hydropower and pumping and accumulating, and finally utilizing thermal power to determine that the capacity balance positions of various power supplies on the maximum load day are hydropower base load, thermal power working capacity, hydropower adjustable capacity and pumping and accumulating working capacity in sequence from bottom to top, wherein the hydropower base load, the thermal power working capacity, the hydropower adjustable capacity and the pumping and accumulating working capacity are shown in fig. 2; and then respectively obtaining the lower limit and the upper limit positions of various power supplies in capacity balance, wherein the formulas are as follows:
；
；
；
；
；
；
wherein: p (P) T,d And P T,u Respectively the lower limit and the upper limit of the thermal power in the capacity balance, and kW; p (P) H,d And P H，u Respectively are provided withThe lower limit and the upper limit of the water power in the capacity balance are kW; p (P) P,d And P P,u The lower limit and the upper limit of the drawing and accumulating in the capacity balance are respectively kW.
And step four, obtaining a maximum load day residual load according to the maximum load day electric load and the maximum load day new energy output, wherein the formula is as follows:
；
wherein L is i,r The residual load at the ith moment of the maximum load day, kW; l (L) i The power load at the ith moment of the maximum load day, kW; n (N) i,s&w The new energy output at the ith moment of the maximum load day is kW;
considering the power output of the new energy source in the maximum load day, the required power generation amount in the hydropower adjustment capacity range is the power of the residual load in the hydropower adjustment capacity range in the maximum load day, and as shown in (1) in fig. 3, the formula is as follows:
；
wherein: x is X i For the first conversion variable, E H,a,need The power generation amount is required in the hydropower capacity adjustable range, and kWh is calculated;
the water-electricity surplus and shortage electric quantity is obtained according to the water-electricity adjustable electric quantity and the required electric quantity in the water-electricity adjustable capacity range, and the formula is as follows:
；
wherein: e (E) H,y&k kWh is the surplus and deficient electric quantity of water and electricity;
if E H,y&k <0, indicating that the hydropower adjustable electric quantity is insufficient to fill the maximum daily residual load in the hydropower adjustable capacity range, and the electricity needs to be pumped and stored for power generation to supplement the shortage electric quantity-E H,y&k The formula is as follows:
；
wherein: e (E) P-H The water-electricity shortage electric quantity which needs to be pumped and stored is supplied, and kWh;
if E H,y&k >0, indicating that the hydropower adjustable electric quantity is in the hydropower adjustable capacity range, and the residual electric quantity is used for supplementing, storing and pumping after the residual load of the maximum load day is filled; the water and electricity supply, storage and water pumping electric quantity can be recorded;
combining the position of the maximum load day residual load and the working capacity of the thermal power, as part (2) in fig. 3 can supply and store the pumping electricity quantity, but the pumping electricity quantity for pumping and storing the thermal power is calculated according to the pumping electricity quantity for pumping and storing the thermal power for the maximum load day thermal power by combining the limit of the pumping and storing the working capacity, and the formula is as follows:
；
；
wherein: n (N) i,T-P The thermal power at the ith moment of the maximum load day can be used for pumping and storing pumping power, and the power consumption is kW; e (E) T-P Pumping electricity for the thermal power supply and storage and kWh;
the water power supply, the storage and the water pumping electric quantity are calculated according to two parts (3) and (4) in the figure 3,
(3) part, if L i，r >P H,d The formula is as follows:
；
(4) part, if L i，r ≤P H,d The formula is as follows:
；
wherein: y is Y i As a second conversion variable, Z i As a third conversion variable E H-P,1sp Supplying the first part of waterPumping and storing the pumping electricity quantity and kWh; e (E) H-P,2sp Supplying and storing pumping electricity quantity for the second part of water and electricity, and kWh;
the water and electricity surplus and shortage electric quantity is combined to calculate the water and electricity available pumping and storing electric quantity, and the formula is as follows:
；
wherein: e (E) H-P The water power can be supplied to the hydropower station for storing and pumping water power, and kWh;
and (3) calculating the energy generation required by pumping and accumulating by combining the maximum load daily residual load and the pumped storage working capacity position, wherein the formula is as follows, as shown in part (5) in fig. 3:
；
wherein: n (N) i For the fourth conversion variable, E P kWh is used for pumping and accumulating the required power generation;
judging whether the thermal power and hydroelectric power available for pumping and storing water pumping electricity is equal to the required power generation amount for pumping and storing after considering the conversion efficiency, namely E, according to the conversion efficiency beta of 0.75 P Whether or not equal to beta (E T-P +E H-P ) The method comprises the steps of carrying out a first treatment on the surface of the If the thermal power is equal to the minimum starting capacity, the working capacity of the pumping and accumulating and the working capacity of the thermal power which are assumed in the third step are determined to be reasonable, and the minimum starting capacity of the thermal power is obtained, and the formula is as follows:
；
wherein: n (N) T,o The minimum starting capacity is the thermal power, kW;
if not, returning to the third step to presume the pumping and accumulating working capacity and the thermal power working capacity again until the reasonable pumping and accumulating working capacity is determined.
By adopting the method for each month in the year, reasonable pumping and storage working capacity and reasonable minimum starting capacity of thermal power in each month can be obtained, and a foundation can be laid for simulating the electric power and electric quantity balance production of an electric power system.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (5)
1. The method for determining the pumping and accumulating working capacity based on the reliable electric quantity support is characterized by comprising the following steps of:
the first step: the electric power and electric quantity balance takes a month as a balance period, the capacity requirement of the month is analyzed by the maximum load day in the month, and the boundary condition is defined;
and a second step of: according to the output characteristics of new energy in the power system in the month, taking a typical sunrise process of the new energy in the month as a maximum load day new energy output process according to the electric quantity guarantee rate, and calculating a maximum load day hydropower adjustable average output;
and a third step of: the method comprises the steps of assuming that the pumping and accumulating working capacity and the thermal power working capacity are subjected to capacity preliminary balance, and determining the balance positions of various power supplies;
fourth step: according to the maximum load daily load process and the maximum load daily new energy output process, obtaining a maximum load daily residual load, calculating the extractable electric quantity of the extraction and the required electric quantity of the extraction and storage according to the balance positions of various power supplies and the maximum load daily residual load, judging whether the extractable electric quantity of the extraction and storage is equal to the required electric quantity of the extraction and storage after conversion according to the conversion efficiency, if so, determining that the assumed extraction and storage working capacity and the thermal power working capacity of the step three are reasonable, obtaining the minimum starting capacity of the thermal power, and if not, returning to the step three, and re-assuming the extraction and storage working capacity and the thermal power working capacity until the reasonable extraction and storage working capacity is determined.
2. The reliable electric quantity support-based pumping and accumulating working capacity determining method according to claim 1, wherein the method comprises the following steps of: the first step is to analyze the capacity requirement of the month with the month maximum load day in the balance period of the electric power and the electric quantity; the capacity requirement comprises maximum load, load reserve and accident reserve, the load reserve and the accident reserve are expressed by reserve rates, and the formula is as follows:
N d ＝L max ·(1+γ l +γ e ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein: n (N) d Is the capacity requirement, kW; l (L) max Maximum load, kW; gamma ray 1 The load reserve rate is used; gamma ray e The accident reserve rate is the accident reserve rate;
the clear boundary condition is that the standby arrangement proportion of various power supplies is clear according to the standby bearing arrangement strategy of various power supplies in the power system, and the sum of the standby capacities of various power supplies is equal to the load standby capacity of the power system; wherein the spare capacity of the load born by the thermal power is N T，1 kW; the spare capacity of accident load borne by thermal power is N T，e kW; the water and electricity working capacity is N H，w kW; the hydropower working capacity is the hydropower installation capacity minus the hydropower overhaul capacity, the hydropower load reserve capacity, the accident reserve capacity and the hydropower blocking capacity.
3. The reliable electric quantity support-based pumping and accumulating working capacity determining method according to claim 2, wherein the method comprises the following steps of: the average power output of the solar water heater with the maximum load can be adjusted by calculating the formula as follows:
in (1) the->The average output power for maximum load day water power can be adjusted, kW; />Average power of water, electricity and month in runoff regulation results is kW; n (N) H，b The power is applied to the water-electricity base charge, and kW; n (N) H，b The minimum output of the hydropower station single machine stable operation and the maximum value in the ecological base load are kW; alpha is a coefficient according to the water power regulation.
4. A reliable electric quantity support-based pumping and accumulating working capacity determining method according to claim 3, wherein: the third step is to divide the hydropower working capacity into hydropower base charge output and hydropower adjustable capacity, and the formula is as follows:
N H，a ＝N H，w -N H，b the method comprises the steps of carrying out a first treatment on the surface of the Wherein N is H，a The capacity is adjustable for hydropower, kW;
the sum of the thermal power working capacity and the pumping and accumulating working capacity is determined, and the formula is as follows:
N T，w +N P，w ＝L max -N H，w the method comprises the steps of carrying out a first treatment on the surface of the Wherein N is T，w The working capacity of the thermal power is kW; n (N) P，w The working capacity is pumping and accumulating, and kW;
the method comprises the steps of respectively assuming pumping and accumulating working capacity and thermal power working capacity, carrying out preliminary capacity balance on the load of the maximum load day in a month, utilizing the power supply working capacity to preferentially utilize hydropower and pumping and accumulating, and finally utilizing thermal power to determine that the capacity balance positions of various power supplies on the maximum load day are hydropower base load, thermal power working capacity, hydropower adjustable capacity and pumping and accumulating working capacity from bottom to top in sequence; and then respectively obtaining the lower limit and the upper limit positions of various power supplies in capacity balance, wherein the formulas are as follows:
P T，d ＝N H，b ；P T，u ＝P T，d +N T，w ；P H，d ＝P T，u ；P H，u ＝P H，d +N H，a ；P P，d ＝P H，u ；P P，u ＝P P，d +N P，w ；
wherein: p (P) T，d And P T，u Respectively the lower limit and the upper limit of the thermal power in the capacity balance, and kW; p (P) H，d And P H，u The lower limit and the upper limit of the water and electricity in the capacity balance are respectively kW; p (P) P，d And P P，u The lower limit and the upper limit of the drawing and accumulating in the capacity balance are respectively kW.
5. The reliable electric quantity support-based pumping and accumulating working capacity determining method according to claim 4, wherein the method comprises the following steps: and step four, obtaining a maximum load day residual load according to the maximum load day electric load and the maximum load day new energy output, wherein the formula is as follows:
L i，r ＝L i -N i，s&w the method comprises the steps of carrying out a first treatment on the surface of the Wherein L is i，r The residual load at the ith moment of the maximum load day, kW; l (L) i The power load at the ith moment of the maximum load day, kW; n (N) i，s&w The new energy output at the ith moment of the maximum load day is kW;
after the output of the new energy source with the maximum load day is considered, the required power generation amount in the hydropower adjustable capacity range is the power quantity of the residual load with the maximum load day in the hydropower adjustable capacity range, and the formula is as follows:
wherein: x is X i For the first conversion variable, E H，a，need The power generation amount is required in the hydropower capacity adjustable range, and kWh is calculated;
the water-electricity surplus and shortage electric quantity is obtained according to the water-electricity adjustable electric quantity and the required electric quantity in the water-electricity adjustable capacity range, and the formula is as follows:
wherein: e (E) H，y&k kWh is the surplus and deficient electric quantity of water and electricity;
if E H，y&k Less than 0, the maximum daily residual load in the hydropower adjustable capacity range is not filled by the hydropower adjustable electric quantity, and the electricity is pumped, stored and generated to supplement the shortage electric quantity-E H，y&k The formula is as follows:
E P-H ＝Max(0，-E H，y&k ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein: e (E) P-H The water-electricity shortage electric quantity which needs to be pumped and stored is supplied, and kWh;
if E H，y&k >0, indicating that the hydropower adjustable electric quantity is in the hydropower adjustable capacity range, and the residual electric quantity is used for supplementing, storing and pumping after the residual load of the maximum load day is filled;
according to the maximum load solar thermal power available pumping and storing pumping power, the thermal power available pumping and storing pumping power is calculated, and the formula is as follows:
N i，T-P ＝Min(N P，w ，Max(P T，u -L i，r ，0))；wherein: n (N) i，T-P The thermal power at the ith moment of the maximum load day can be used for pumping and storing pumping power, and the power consumption is kW; e (E) T-P Pumping electricity for the thermal power supply and storage and kWh;
the water power supply, the water storage and the water pumping electric quantity are calculated by two parts, wherein one part is calculated by L i，r >P H，d The formula is as follows:
another part, if L i，r ≤P H，d The formula is as follows:
wherein: y is Y i As a second conversion variable, Z i As a third conversion variable E H-P，1sp Supplying and storing water pumping electric quantity for the first part of water and electricity, and kWh; e (E) H-P，2sp Supplying and storing pumping electricity quantity for the second part of water and electricity, and kWh;
the water and electricity surplus and shortage electric quantity is combined to calculate the water and electricity available pumping and storing electric quantity, and the formula is as follows:
E H-P ＝Min(E H，y&k ，E H-P，1sp +E H-P，2sp ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein: e (E) H-P The water power can be supplied to the hydropower station for storing and pumping water power, and kWh;
and calculating the power generation amount required by pumping and accumulating by combining the daily residual load of the maximum load, wherein the formula is as follows:
wherein: n (N) i For the fourth conversion variable, E P To draw and store the required generated energy，kWh；
Judging whether the thermal power and hydroelectric power available pumping and storage pumping electricity quantity is equal to the pumping and storage required electricity generation quantity after considering the conversion efficiency according to the conversion efficiency beta, namely E P Whether or not equal to beta (E T-P +E H-P ) The method comprises the steps of carrying out a first treatment on the surface of the If the thermal power is equal to the minimum starting capacity, the working capacity of the pumping and accumulating and the working capacity of the thermal power which are assumed in the third step are determined to be reasonable, and the minimum starting capacity of the thermal power is obtained, and the formula is as follows:
N T，o ＝N T，w +N T，1 +0.5·N T，e the method comprises the steps of carrying out a first treatment on the surface of the Wherein: n (N) T，o The minimum starting capacity is the thermal power, kW;
if not, returning to the third step to presume the pumping and storage working capacity and the thermal power working capacity again until the reasonable pumping and storage working capacity and the thermal power working capacity are determined.
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