CN109038623B - Valley filling method and device for pumped storage power station and storage medium - Google Patents
Valley filling method and device for pumped storage power station and storage medium Download PDFInfo
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Abstract
The invention discloses a valley filling method and device for a pumped storage power station and a storage medium. The method comprises the following steps: s1, acquiring a load valley curve and the energy to be pumped of the pumped storage power station; s2, obtaining a first intersection point and a second intersection point, wherein the first intersection point and the second intersection point are the water pumping starting time of the first unit and the water pumping stopping time of the last unit respectively; s3, calculating the water pumping energy of the single unit in the time period from the water pumping starting time of the first unit to the water pumping stopping time of the last unit, and calculating the first remaining energy to be pumped; taking the first residual energy to be pumped as new energy to be pumped; and repeating the steps of S2-S3 to obtain the water pumping starting time and the water pumping stopping time of all the units, and completing valley filling. The effect of accurate millet of filling of pumped storage power station has been realized. Further included are apparatus implementing the above method, and a storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method.
Description
Technical Field
The invention relates to the technical field of power dispatching production operation, in particular to a valley filling method, a valley filling device and a storage medium for a pumped storage power station.
Background
With the rapid growth of wind power installations, when clean energy cannot be fully consumed by a power grid, wind power is brought into the electricity abandoning category besides water abandoning. Analyzing the characteristics of the problem of consuming clean energy: 1) all are load low ebb and part of waist load time; 2) continuous rainfall or a large formula of peak valley in winter; 3) the basic load of the power grid is low; 4) the continuous rainfall causes that the regulated reservoir becomes a radial-flow power station, and the minimum technical output of thermal power runs even deep peak regulation; 5) the wind and the incoming water are basically superposed, the wind resource is particularly good when the hydroelectric power generation capacity is large, and the characteristic of reverse peak regulation is presented.
A large amount of operation data shows that the absorption problem is most serious in the load trough time, and the current means for effectively relieving the electricity abandonment of clean energy sources in the load trough is a pumped storage power station. The valley filling function of the pumped storage power station can lift the load valley bottom, so that more space is vacated, more clean energy is consumed, and the electricity abandonment quantity is reduced.
According to analysis and mining of actual power grid operation data, the effect of the starting and stopping time arrangement of the existing pumped storage power station on valley filling in a low-load period is not ideal, and the consumption space of clean energy in the valley needs to be optimized. The water pumping and energy storage at the time of the lowest daily load of the power grid (at the moment, the time is usually the time of the most intense negative standby), only the last two units are left in the water pumping state, and if wind/water is greatly generated at the moment, the situation of abandoning the wind/water is likely to happen. The method is characterized in that the maximum valley filling power of a pumped storage power station is paid attention to, but little attention is paid to the valley filling accuracy and the generated benefits of the pumped storage power station in a period of time, and a related method of accurate valley filling is adopted rarely when a power grid plan is made or the power grid is scheduled to run.
Disclosure of Invention
In order to solve the technical problem that valley filling of the pumped storage power station is not accurate in the load valley period, the invention provides a valley filling method, a device and a storage medium of the pumped storage power station.
The technical problem of the invention is solved by the following technical scheme:
a valley filling method of a pumped storage power station, wherein the pumped storage power station comprises a plurality of units, and sequencing is carried out according to the pumping starting time of the units, and the method comprises the following steps:
s1, acquiring a load valley curve and the energy to be pumped of the pumping and storage power station;
s2, forming an area which is equal to the energy to be pumped by the horizontal line and the load valley curve to obtain a first intersection point and a second intersection point, wherein the first intersection point and the second intersection point are respectively the pumping starting time of the first unit and the pumping stopping time of the last unit;
s3, calculating the water pumping energy of a single unit in the time period from the water pumping starting time of the first unit to the water pumping stopping time of the last unit, and calculating the first remaining energy to be pumped by combining the energy to be pumped; and taking the first remaining energy to be pumped as new energy to be pumped, and repeating the steps S2-S3 until the pumping start time and the pumping stop time of all the units are obtained, so as to complete valley filling.
Preferably, after step S3, the method further includes adjusting the pumping start time of a plurality of the units.
Further, adjusting the pumping start time of the plurality of units comprises the following steps:
t1, calculating the water pumping energy of the single unit in the time period according to the water pumping starting time of the last unit and the water pumping stopping time of the first unit, and calculating the final residual water pumping energy by combining the water pumping starting time of the last unit, the water pumping stopping time of the first unit, the area formed by the horizontal line and the load valley curve;
and T2, distributing the final remaining energy to be pumped to a plurality of the units to obtain the adjusted pumping starting time of each unit.
Preferably, the load trough curve comprises a next-day load prediction curve or a net load trough curve.
Preferably, the calculation formula of the pumping start time and the pumping stop time is as follows:
wherein S represents the first remaining energy to be pumped; t is tmIndicates the pumping start time, T, of the mth unitnThe pumping stop time of the nth unit from the last is represented, m is more than or equal to 1, and n is more than or equal to 1; p represents a power value corresponding to the pumping starting time of the load valley curve in the mth unit or the pumping stopping time of the nth unit from last; l (t) represents the power value corresponding to the load trough curve at time t.
Further, the formula of the first remaining energy to be pumped is as follows:
wherein S isPumping storage deviceRepresenting the energy to be pumped, and S representing the first remaining energy to be pumped; t is tm+1Indicates the pumping start time, T, of the (m + 1) th unitn-1Representing the pumping stop time of the (n-1) last unit; pSingle water pumpAnd the power value of pumping water of a single unit is shown.
The invention also includes a valley-fill apparatus for a pumped-storage power plant comprising a display, a processor and a computer program stored on a memory and executable on the processor, characterized in that the processor implements the steps of any of the methods described above when executing the computer program.
Furthermore, the invention also comprises a storage medium having stored thereon a computer program which, when being executed by a processor, carries out the steps of the method of any of the above.
Compared with the prior art, the invention has the advantages that: the load valley curve and the energy to be pumped of the pumping storage power station are known, two intersection points of the horizontal line and the load valley curve can be obtained by forming an area which is equal to the energy to be pumped by the load valley curve and the horizontal line, the two intersection points are respectively a first intersection point and a second intersection point, because the first intersection point is the earliest pumping starting time and the second intersection point is the latest pumping stopping time, the two intersection points are respectively the pumping starting time of the first unit and the pumping stopping time of the last unit, then the pumping energy which can be completed by the single unit in the period of time is calculated, the first residual energy to be pumped can be calculated by combining the energy to be pumped, the first residual energy to be pumped also needs to be completed by a plurality of other known units, so the first residual energy to be pumped can be used as the new energy to be pumped, the steps S2-S3 are repeated, the starting time of one unit and the corresponding pumping stopping time of the other units are obtained each time, and fitting the pumping curve of the pumped storage power station to the maximum extent by obtaining the pumping starting time and the pumping stopping time of all the units so as to realize the effect of accurate valley filling of the pumped storage power station.
Drawings
Fig. 1 is a flow chart of a method for filling a pumped storage power station in an embodiment 1 of the present invention.
Fig. 2 is a graph of next day load prediction in embodiment 2 of the present invention.
Fig. 3 is a graph of the originally planned pumping of the pumped storage power station in embodiment 2 of the present invention.
Fig. 4 is a schematic diagram of acquiring the pumping start time of the first unit and the pumping stop time of the last unit in embodiment 2 of the present invention.
Fig. 5 is a schematic diagram of acquiring the pumping start time of the second unit and the pumping stop time of the penultimate unit in embodiment 2 of the present invention.
Fig. 6 is a schematic diagram of obtaining the pumping start time and the pumping stop time of the third last unit in embodiment 2 of the present invention.
Fig. 7 is a schematic diagram of acquiring the pumping start time of the fourth unit and the pumping stop time of the first unit in embodiment 2 of the present invention.
Fig. 8 is a graph comparing the valley-fill load curves before and after optimization in example 2 of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Example 1
With reference to fig. 1, this embodiment provides a method for filling a pumped storage power station, where the pumped storage power station includes multiple units, and the pumped storage power station is sorted according to pumping start times of the units, and the method includes the following steps:
and S1, acquiring the load valley curve and the energy to be pumped of the pumping and storage power station. Wherein the load trough curve comprises a next-day load prediction curve or a net load trough curve.
And S2, forming an area which is equal to the energy to be pumped by the horizontal line and the load valley curve, and obtaining a first intersection point and a second intersection point, wherein the first intersection point and the second intersection point are respectively the pumping starting time of the first unit and the pumping stopping time of the last unit.
S3, calculating the water pumping energy of a single unit in the time period from the water pumping starting time of the first unit to the water pumping stopping time of the last unit, and calculating the first remaining energy to be pumped by combining the energy to be pumped; and taking the first remaining energy to be pumped as new energy to be pumped, and repeating the steps S2-S3 until the pumping start time and the pumping stop time of all the units are obtained, so as to complete valley filling.
And S4, adjusting the water pumping starting time of the multiple units.
Further, adjusting the pumping start time of the plurality of units comprises the following steps:
t1, calculating the water pumping energy of one unit in the time period according to the water pumping starting time of the last unit and the water pumping stopping time of the first unit, and calculating the final residual water pumping energy by combining the water pumping starting time of the last unit, the water pumping stopping time of the first unit, the horizontal line and the area formed by the load valley curve;
and T2, distributing the final remaining energy to be pumped to a plurality of the units to obtain the adjusted pumping starting time of each unit.
Based on the above embodiment, the calculation formulas of the pumping start time and the pumping stop time in this embodiment are as follows:
wherein S represents the first remaining energy to be pumped; t is tmIndicates the pumping start time, T, of the mth unitnThe pumping stop time of the nth unit from the last is represented, m is more than or equal to 1, and n is more than or equal to 1; p represents a power value corresponding to the pumping starting time of the load valley curve in the mth unit or the pumping stopping time of the nth unit from last; l (t) represents the power value corresponding to the load trough curve at time t.
Further, the formula of the first remaining energy to be pumped is as follows:
wherein S isPumping storage deviceRepresenting the energy to be pumped, and S representing the first remaining energy to be pumped; t is tm+1Indicates the pumping start time, T, of the (m + 1) th unitn-1Representing the pumping stop time of the (n-1) last unit; pSingle water pumpAnd the power value of pumping water of a single unit is shown.
The present embodiment also includes an apparatus for pumped-storage power station valley fill, comprising a display, a processor, and a computer program stored on a memory and executable on the processor, wherein the processor implements the steps of any of the methods described above when executing the computer program.
Furthermore, the present embodiment also includes a storage medium having a computer program stored thereon, wherein the computer program is configured to implement the steps of any of the above methods when executed by a processor.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
To further illustrate the pumped-storage power station valley filling method in the above embodiment, the following description is made with reference to a more specific case:
example 2
The embodiment provides a pumped storage power station valley filling method, wherein the pumped storage power station (pumped storage power station) comprises four units which are responsible for pumped storage, and the method comprises the following steps:
1. the next day load prediction curve shown in fig. 2 and the energy to be pumped for the pumped-storage power station obtained from fig. 3 were obtained at 379469 mw/min. It should be noted that the abscissa of the next-day load prediction graph shown in fig. 2 represents time, and the ordinate represents power, and the unit is Megawatt (MW); in the diagram of the arrangement of the energy to be pumped of the pumped storage power station shown in fig. 3, the abscissa represents time, the ordinate represents power in Megawatts (MW), and negative values represent pumping power; the pumping power of a single unit is 300 MW.
And the water pumping area of the power station is the energy to be pumped in the load trough period. Let f (t) be the pumped storage output at time t, then the energy to be pumped can be used for f (t) as integral S in the pumping time periodPumping storage deviceTo calculate.
2. Acquiring a first intersection point and a second intersection point: the pumped and stored energy to be pumped is compared with that of one cup of water and poured into a negative tankThe intersection point of the horizontal line and the load valley curve is the water pumping starting time T1 of the first unit and the water pumping stopping time T4 of the fourth unit, and the area S enclosed by the load valley curve and the horizontal ruler is calculated1. Specific values of T1 and T4 can be found by making the area equal to the pumped energy to be pumped. The energy to be pumped of the pumping power station is calculated in the previous step. l (t) is a power value corresponding to the load trough prediction curve of the next day at the time t, and the load trough curve in fig. 4 is a curve drawn by l (t) and is a known quantity.
As shown in fig. 4, the horizontal line is moved to the area equal to the pumped energy to be pumped:
the values of T1, T4 and P1 were obtained. At the moment, the water pumping starting time of the first unit and the water pumping stopping time of the fourth unit can be obtained. The pumping start time T1 of the first unit is 01:14, and the pumping stop time T4 of the last unit is 7: 18.
3. Acquiring the water pumping starting time T2 of the second unit and the water pumping stopping time T3 of the penultimate unit: calculating the area enclosed by the load valley curve and the horizontal line as S2:
the residual energy S' is equal to the total energy S to be pumpedPumping storage deviceThe first layer pumping energy is subtracted. The pumping capacity of each unit of the pumping power station is known, and the pumping energy of the first layer is equal to the integral of the capacity of each unit in time obtained in the previous step, then
The remaining energy can be determined as follows:
will S2Pouring into the load trough, as shown in FIG. 5, so that the area formed by the horizontal line and the load trough curve is equal to S2The obtained intersection points are the water pumping starting time T2 of the second unit and the last water pumping stopping time T3. The pumping start time T2 of the second unit is 01:45, and the pumping stop time T3 of the penultimate unit is 7: 15.
4. And (3) acquiring the water pumping starting time T3 of the third unit and the water pumping stopping time T2 of the last third unit by the same method as the step 3:
residual water pumping energy
Dumping the remaining energy into the load trough, as shown in fig. 6, such that the area formed by the horizontal line and the load trough curve is equal to S3172064MW min, the intersection of the horizontal line with the load trough curve is 02:26 for the start time T3 of pumping the third station and 7:11 for the end point T2 of the third last station.
5. Obtaining the starting time T4 of the fourth water pumping to be 02:56 and the terminal point T1 of the fourth last to be 7:07 by the same method in the step 3 or the step 4; in particular, the remaining water pumping energy
Dumping the remaining energy into the load trough, as shown in fig. 7, such that the area formed by the horizontal line and the load trough curve is equal to S487300MW min, the intersection of the horizontal plane with the load trough curve is the start time T4 for the pumping of the fourth station 02:56 and the end point T1 for the fourth to last station 02:567:07。
6. The water pumping starting time and the water pumping stopping time of each unit are finely adjusted, and the water pumping curve obtained through the steps is completely fitted with the load valley curve because of S4The area of the water pump is actually not equal to the pumping energy of the single unit in the time period, and a difference area S existsDifference amountOn the other hand, the pumping time of the unit is about several minutes for starting the pumping to reach the rated capacity, and the pumping is closed very quickly, so the starting time needs to be finely adjusted.
Considering that the load valley curve rapidly rises and the pumping units are rapidly closed in the early morning and later, the pumping termination time of each layer is advanced by the pumping termination time calculated in four steps, the pumping energy of each layer is pushed forward along the time axis, the total energy is ensured to be unchanged, and the matching of the four pumping units is completed. In this example, the water pumping power of the four units is 1200 megawatts, and the calculated result is 10 minutes, that is, the starting time of each unit is advanced by 10 minutes.
The calculation process is as follows:
tdifference amount＝SDifference amountThe power of pumping water simultaneously by each unit is 12000MW min/(300MW 4) 10 min;
in this embodiment, in a certain period of time 01:46-07:14 on a certain day, the negative backup of the thermal power is zero, if the load in the period of time is low, the clean energy is large in thermal power, the backup is not performed, and by checking the valley filling condition of the pumped storage power station (pumped storage power station) in the period of time, the electric quantity which needs to be reduced if the clean energy is large in thermal power can be calculated.
Original curve:
optimizing a curve:
the increased consumption electric quantity is pumped up in the time period that the negative standby is zero, namely the reduced abandoned electric quantity,
the reduced electricity loss was 373492.79-344170.62-29322 megawatts per minute-48.9 ten thousand kWh.
Another way to understand, if clean energy is generated in a low load valley and thermal power is not available for standby at the moment, power adjustment of a connecting line (namely emergency transaction and the like) is not considered, and the electric quantity of the electric quantity abandoned by about 49 kWh can be reduced by adopting optimized storage on the same day. If this continues for one month, the amount of electricity discarded can be reduced by about 1470 kWh.
The purpose of optimizing the operation of the pumping storage is achieved, and under the condition that no extra cost is added to scheduling operation, only the startup and shutdown time (the water pumping start time and the water pumping stop time) of each pumping storage needs to be adjusted, as shown in fig. 8, the optimized valley filling load valley curve is obviously lifted at the load valley around 7 points in the morning, the consumption space of the system in the negative standby tension period is increased, and the wind and water abandoning amount of the power grid is reduced.
The principle steps of the pumped storage power station valley filling method provided by the invention are as follows:
1. the secondary load curve and the pumpable energy of the pumped storage power station must be known.
2. And determining whether to adopt a load valley curve or a net load valley curve for energy filling according to whether other power generation resource output curves are known.
3. And calculating the starting and stopping time of each unit by adopting an energy layering filling method.
4. And finely adjusting the starting and stopping time of each unit according to the principle that the total energy area is unchanged.
The technical effects of the pumped storage power station valley filling method provided by the invention comprise that:
(1) and any cost for scheduling operation is not required to be increased, and no cost burden is caused.
(2) When the method is used for making the power generation plan of the energy storage power station such as the pumped storage station, the start-stop strategy of each unit can be quickly made, and the method is simple and efficient.
(3) After the precise valley filling, the consumption space of the power grid in the load valley period can be improved, the electricity abandoning loss of clean energy is reduced, and the pumping and storage benefits are fully exerted.
(4) By adopting the method, the evaluation after the operation of various energy storage power stations can be carried out according to historical actual operation data.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several equivalent substitutions or obvious modifications can be made without departing from the spirit of the invention, and all the properties or uses are considered to be within the scope of the invention.
Claims (6)
1. A valley filling method of a pumped storage power station, wherein the pumped storage power station comprises a plurality of units, and sequencing is carried out according to the pumping starting time of the units, and the method is characterized by comprising the following steps:
s1, acquiring a load valley curve and the energy to be pumped of the pumped storage power station;
s2, forming an area which is equal to the energy to be pumped by the horizontal line and the load valley curve to obtain a first intersection point and a second intersection point, wherein the first intersection point and the second intersection point are respectively the pumping starting time of the first unit and the pumping stopping time of the last unit;
s3, calculating the water pumping energy of a single unit in the time period from the water pumping starting time of the first unit to the water pumping stopping time of the last unit, and calculating the first remaining energy to be pumped by combining the energy to be pumped; taking the first remaining energy to be pumped as new energy to be pumped, repeating the steps S2-S3 until the pumping start time and the pumping stop time of all the units are obtained, and completing valley filling;
the calculation formula of the water pumping starting time and the water pumping stopping time is as follows:
wherein the content of the first and second substances,Srepresenting the first remaining energy to be pumped; t is tmIndicates the pumping start time, T, of the mth unitnThe pumping stop time of the nth unit from the last is represented, m is more than or equal to 1, and n is more than or equal to 1; p represents a power value corresponding to the pumping starting time of the load valley curve in the mth unit or the pumping stopping time of the nth unit from last; l (t) represents the power value corresponding to the load valley curve at the moment t;
the first remaining water energy to be pumped is calculated according to the following formula:
wherein the content of the first and second substances,S pumping storage deviceThe energy of the water to be pumped is shown,Srepresenting the first remaining energy to be pumped; t is tm+1Indicates the pumping start time, T, of the (m + 1) th unitn-1Representing the pumping stop time of the (n-1) last unit; pSingle water pumpAnd the power value of pumping water of a single unit is shown.
2. The method of claim 1, further comprising adjusting a pumping start time of a plurality of said units after step S3.
3. The method of claim 2, wherein adjusting the pump activation time for a plurality of said units comprises the steps of:
t1, calculating the water pumping energy of the single unit in the time period according to the water pumping starting time of the last unit and the water pumping stopping time of the first unit, and calculating the final residual water pumping energy by combining the water pumping starting time of the last unit, the water pumping stopping time of the first unit, the area formed by the horizontal line and the load valley curve;
and T2, distributing the final remaining energy to be pumped to a plurality of the units to obtain the adjusted pumping starting time of each unit.
4. The method of claim 1, wherein the load trough curve comprises a next-day load prediction curve or a net load trough curve.
5. A valley-fill apparatus for a pumped-storage power plant comprising a display, a processor and a computer program stored on a memory and run on said processor, characterized in that the steps of the method as claimed in any one of claims 1 to 4 are carried out by said processor when said computer program is executed.
6. A storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, performs the steps of the method according to any of claims 1 to 4.
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