CN116305942A - Virtual reservoir water level stage-by-stage and stage-by-stage continuous rolling calculation method - Google Patents
Virtual reservoir water level stage-by-stage and stage-by-stage continuous rolling calculation method Download PDFInfo
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Abstract
The virtual reservoir model and the virtual reservoir water level calculating method are characterized in that reservoir resources are distributed based on electricity distribution proportion, the water storage quantity and the reservoir capacity are distributed according to the electricity distribution proportion, and a left and a right bank virtual reservoirs are respectively built corresponding to a left and a right shore power stations; if the operation mode of a certain side power station possibly breaks through the constraint condition, adjusting in real-time scheduling; however, in the calculation of the virtual reservoir model, the virtual water outlet quantity is generated for satisfying the constraint according to the constraint calculation, and is automatically abandoned according to a party and is removed from the distributed water quantity. The virtual water level obtained by calculation can intuitively reflect the conditions of power generation, scheduling operation and the like of the left and right shore power stations; the method has reference utilization value for the utilization of two-network water resources and the distribution of electric quantity.
Description
Technical Field
The invention relates to the technical field of water conservancy and hydropower, in particular to a virtual reservoir model and a virtual reservoir water level calculation method.
Background
The xi Luo du reservoir is positioned at the downstream of Jinsha river and at the junction of Sichuan and Yunnan, the left and right shore power dispatching belongs to home appliance network limited company and south China network limited liability company, and the two power stations operate independently without electric connection in the middle. The electricity distribution ratio dead water period (11 months-12 months, 1 month-5 months) of the left and right shore power stations is 42:58, and the water rich period (6 months-10 months) is 50:50. According to two agreements with the grid and the ferry plant: when the actual power generation amounts on the left and right banks are not balanced according to the specified proportion, the deviation electric quantity is required to be counted, and the deviation electric quantity is basically processed in a daily statistics, monthly accumulation, next month processing and full-scale respective balancing mode. In real-time operation, the two power grids are comprehensively considered from the angles of warehouse-in flow forecast, reservoir operation constraint, power grid electricity demand, line maintenance, power grid safety and the like, and the left and right bank output is not absolutely arranged according to the electricity dividing proportion.
The existing deviation electric quantity calculation method only reflects the deviation of the actual electric energy production of two power stations, and the right and left shore power stations and the obligations are not considered. The two sides distribute the generated energy in proportion and simultaneously need to bear the comprehensive tasks of the reservoir in proportion, and the comprehensive tasks born by the other side of one power station should be embodied in the distribution of the water for generating power. The actual operation reservoir has limited reservoir capacity and more operation constraint, no visual index is used for reflecting the historical power generation water conditions of two power stations at present, when resources are limited, for example, the maximum peak regulation amount of the reservoir is smaller than the peak regulation requirements of two power grids, the mode of distributing the peak regulation amount according to the power distribution proportion is adopted at present, and the fact that the two power stations have different contributions to the existing peak regulation amount for the reservoir in the early operation is not considered. The two independent power stations share one water reservoir, the two power grids all hope to use the reservoir fairly, the electric water diversion is taken as a principle, the independent left and right bank virtual reservoirs are constructed according to different operation periods, the operation process of the virtual reservoirs is simulated, the electricity generation water consumption condition of the left and right bank power stations is objectively reflected, and the electric water reservoir can be used as the basis for electricity generation planning production and the basis for evaluation (deviation electricity calculation) after operation.
Disclosure of Invention
The invention provides a virtual reservoir model and a virtual reservoir water level calculation method. The left bank and the right bank are completely independent and do not support each other, and the virtual reservoir operates to bear comprehensive tasks according to the electricity dividing proportion. The virtual water level obtained by calculation can intuitively reflect the conditions of power generation, scheduling operation and the like of the left and right shore power stations. The invention has reference utilization value for the water resource utilization and the electric quantity distribution of the two networks.
The technical scheme adopted by the invention is as follows:
the virtual reservoir model distributes reservoir resources based on electricity distribution proportion, distributes the water quantity and the reservoir capacity of the reservoir according to the electricity distribution proportion, and respectively establishes left and right bank virtual reservoirs corresponding to left and right shore power stations; if the operation mode of a certain side power station possibly breaks through the constraint condition, adjusting in real-time scheduling; however, in the calculation of the virtual reservoir model, the virtual water outlet quantity is generated for a plurality of times according to the constraint satisfaction calculation, and the virtual water outlet quantity is removed from the water quantity distributed by one party.
The constraint conditions comprise minimum flow constraint, maximum flow constraint, minimum water level constraint, maximum water level constraint and water level amplitude constraint; the real reservoir flow constraint is converted into a left bank and right bank virtual flow constraint by distribution of electricity distribution proportion; and (3) water level constraint, wherein the virtual water level is used as a basis for judging whether the constraint is met.
The calculation of the virtual water level is based on actual dispatching data of the reservoir, dispatching operation data of the previous day is generally utilized on the same day, and the virtual water level of the previous day is calculated.
Compared with the prior art, the virtual reservoir model and the virtual reservoir water level calculation method have the following advantages:
1): the invention provides a virtual reservoir model based on independent power stations on the left and right sides from the perspective of fairly and scientifically distributing reservoir resources, and fills the blank of the field of actual dispatching operation and evaluation after operation of hydropower stations with two stations and two dispatching stations in one plant.
2): the invention provides a method for continuously calculating virtual water level by stage-by-stage rolling, which not only considers the characteristics of reservoir operation scheduling, but also considers the relative independence of operation stages, and the virtual reservoir calculation based on the method can more objectively reflect the scheduling operation condition of the virtual reservoir.
3): according to the water level calculation method of the virtual reservoir, provided by the invention, the situation that two power stations bear comprehensive tasks is fully considered on the actual running situation of the left and right shore power stations, the power generation water processes of the two power stations are clearly and intuitively reflected by the virtual water level, the calculation of the virtual water level can be used as a basis for guiding the daily scheduling of the left and right shore power stations of the stream ferry 'one-plant two-tone' reservoir, a daily power generation plan is manufactured on the basis, and the situations that the two power stations contend for reservoir regulation space, such as contending for peak regulation and the like in a special period are effectively solved; and a deviation electric quantity calculation method can be established on the basis of the model, so that a post-operation evaluation system of the hydropower station with two stations and two regulations in one plant is perfected.
4): with the development of water and electricity industry in China, reservoirs at national borders and provinces are more and more, and virtual reservoirs have certain popularization value in actual reservoir scheduling of different interest bodies.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a flow chart of the virtual flow, water level calculation of the highest water level constraint of the present invention.
FIG. 2 is a graph of virtual water level at the left and right sides of a stream of Luo (1-5 months) in the post-consumer period 2015.
FIG. 3 is a graph showing the virtual water level process at the left and right sides of a stream of Luo in the period of falling (1-5 months) after 2016 years.
FIG. 4 is a graph showing the virtual water level process at the left and right sides of a stream of Luo's river in the post-consumer period (1-5 months) after 2017.
Detailed Description
And the virtual reservoir model distributes reservoir resources based on the electricity distribution proportion, distributes the water storage quantity and the reservoir capacity according to the electricity distribution proportion, and respectively establishes left and right bank virtual reservoirs corresponding to the left and right shore power stations. The left bank and the right bank of the reservoir based on the virtual reservoir model are completely independent and do not support each other, and the virtual reservoir model must bear comprehensive tasks according to the electricity distribution proportion. If the operation mode of a certain side power station possibly breaks through the constraint condition, adjusting in real-time scheduling; however, in the calculation of the virtual reservoir model, the virtual water outlet quantity is generated for a plurality of times according to the constraint satisfaction calculation, and the virtual water outlet quantity is removed from the water quantity distributed by one party.
The power distribution ratio of the shore power station at the left and right sides of the xi Luo cross: according to the scheme of electric energy consumption from the river ferry to the hydropower station of the domestic dam issued by the national energy agency, the electric energy of the left and right shore power stations of the river ferry is consumed in the withered water period (11 months to 5 months in the next year) according to the proportion of 42:58, and is consumed in the water-rich period (6 months to 10 months) according to the proportion of 50:50. The actual generating capacity of the xi Luo power station is balanced according to the proportion in the national power grid and the south power grid in the Feng period and the dry period.
The actual reservoir operation is constrained by shipping, water supply, construction, safe reservoir bank, downstream reservoir operation and the like, and a plurality of constraint conditions can be simplified into 5 constraint conditions, including minimum flow constraint, maximum flow constraint, minimum water level constraint, maximum water level constraint and water level amplitude constraint; the real reservoir flow constraint is converted into a left bank and right bank virtual flow constraint by distribution of electricity distribution proportion; and (3) water level constraint, wherein the virtual water level is used as a basis for judging whether the constraint is met.
The calculation of the virtual water level is based on actual dispatching data of the reservoir, dispatching operation data of the previous day is generally utilized on the same day, and the virtual water level of the previous day is calculated.
The basic framework of the virtual reservoir model is as follows:
1) Virtual reservoir parameters and indices:
parameters and indexes related to the water level of the virtual reservoir are consistent with those of the actual reservoir, and related parameter indexes related to the flow and the water quantity are distributed according to the distribution proportion in different periods. The water level characteristic value, the reservoir capacity curve and the energy storage curve are shown in tables 1, 2 and 3 respectively.
Table 1 table of characteristic values of water level in Linghu reservoir and virtual reservoir
Table 2 virtual reservoir level-reservoir capacity table for xi Luo du
Table 3 Xilodu virtual reservoir level-energy storage table
2) Virtual water level stage-by-stage continuous rolling calculation:
the power distribution ratio of the stream ferry power station is different, the reservoir operation is divided into a dead water period and a high water period, the electric quantity settlement takes natural years as a period, 6 months in the high water period are in a reservoir water-level period, 7 months and 8 months are in a flood period, 9 months are in a water storage period, 9 months are in a high water level operation period after water storage in the middle and late ten days, and the reservoir operation mode is converted quickly. According to the factors of the electricity dividing proportion, the operation characteristics, the electricity settlement period and the like, the reservoir operation is divided into a plurality of operation periods in natural years, the virtual reservoir water level can be continuously calculated in a rolling mode in the periods, the initial water level is the actual operation water level of the reservoir, and the specific stage is shown in a table 4.
TABLE 4 virtual Water level stage partition Table for Louis
3) The virtual reservoir water level calculating method comprises the following steps:
(1) And (3) calculating water balance:
V i,t ＝V i,t-1 +(Q i,t -q i,t )*△t (1)
in formula 1:
V i,t is the storage capacity of a virtual reservoir t at one side;
V i,t-1 is the storage capacity of a virtual reservoir t-1 at one side; i is a left bank virtual reservoir when 1, and 2 is a right bank virtual reservoir;
Q i,t virtual warehouse-in flow when the flow is at one side t;
q i,t and the virtual delivery flow is the virtual delivery flow at one side t.
(2) Virtual warehouse-in calculation:
Q i,t ＝Q t *p i,t (2)
in formula 2:
Q i,t virtual warehouse-in flow when the flow is at one side t;
Q t the actual warehousing flow is t;
p i,t the electricity distribution ratio of the virtual reservoir at one side is t.
(3) Virtual ex-warehouse calculation:
if Q t <Full hair flow or Q t >Full flow and practically no water discard:
q i,t ＝Eq i,t +△q i,t (3)
in formula 3:
Q t the flow is the warehousing flow at the actual time t;
q i,t virtual delivery flow at one side t;
Eq i,t the actual power generation flow is the actual power generation flow when a power station t is at one side;
Δq i,t and the system is the delivery flow virtually generated for avoiding violating the constraint when a power station t is at one side.
If Q t >Full flow and actual water discard:
q i,t ＝max(Eq i,t )+J i,t (4)
in formula 4:
Q t the flow is the warehousing flow at the actual time t;
q i,t virtual delivery flow at one side t;
max(Eq i,t ) The full-flow rate is generated when a power station t is at one side;
J i,t the maximum full-discharge flow is subtracted from the proportionally allocated actual reject flow at the one-sided power station t.
(4) Calculating the default virtual traffic:
only when the highest water level constraint and the minimum flow constraint are violated, the violated virtual flow needs to be calculated, and when other constraints are violated and the constraint is not violated, the violated virtual flow is zero.
Judging whether the highest water level constraint is met;
Δq i,t the calculation flow of (1) is shown in figure 1.
Judging whether the minimum flow constraint is met;
if Eq i,t <min Q i,t ，△q i,t ＝minq i,t -Eq i,t (5)
If Eq i,t >min Q i,t ，△q i,t ＝0 (6)
Other cases:
△q i,t ＝0 (7)。
4) Calculation example:
as can be seen from fig. 2, in the hydro-fluctuation period of the year 2015, the water level of the river is higher than the virtual reservoir water amount by Zuo An in the super-proportion generation, and the virtual reservoir water amount is used up by 15 days of 4 months, and the total water amount of the river is converted into 7.37 hundred million kw.h because the minimum flow constraint days are not met by the right bank of the river, so that the virtual water level is still closer to the actual water level before 1 day of 4 months under the condition of the under-proportion generation of the right bank of the river.
As can be seen from fig. 3, in 2016 years, the super-proportion power generation of the ferry Zuo An is performed, the proportion power generation of the ferry right bank is performed, the number of days of the least flow constraint is more, the accumulated and abandoned water quantity is reduced to 4.05 hundred million kw.h, and therefore, under the condition of the under-proportion power generation of the ferry right bank, the virtual water level is still relatively close to the actual water level before 4 months and 1 day.
As can be seen from fig. 4, in 2017, the over-proportion power generation of the xi-lu-du Zuo An is performed in the period, the less-proportion power generation is performed on the xi-lu-du right bank, the number of days for which the minimum flow constraint is not met is more on the right bank of the xi-lu-du, the accumulated and abandoned water amount is converted into 7.23 hundred million kw.h, so that under the condition of the under-proportion power generation on the right bank of the xi-lu-du, the virtual water level is still relatively close to the actual water level before 5 months for 1 day, and under the condition of the less-deviated power in the period of the left bank and the right bank of the xi-lu-du-use, the water levels of the left bank and the right bank of the xi-lov-use of the xi-du-use are both lower than the actual water level after 5 months for 1 day.
2-4, the virtual water level process of the bank around the post-year hydro-fluctuation period of 2015-2017 can be seen, and the condition that the right bank of the stream ferry does not meet the minimum flow constraint due to line maintenance and the like is more, and the power generation is always under proportional; the left bank of the Xiluo cross is always in super proportion to generate electricity, so that the electricity demand of the national grid Limited company in the period of fall before the year is larger, and the electricity demand of the national grid Limited company in the south China is smaller.
Claims (2)
1. The virtual reservoir water level stage-by-stage and segment continuous rolling calculation method is characterized by comprising the following steps of: according to different electricity dividing proportions, the reservoir operation is divided into a dead water period and a high water period, the electric quantity settlement takes natural years as a period, 6 months in the high water period are in a reservoir water-level period, 7 months and 8 months are in a flood period, 9 months are in a water storage period, 9 months are in a high water level operation period after water storage in the middle and the last ten days, and the reservoir operation mode is faster to convert;
according to the electricity dividing proportion, the operation characteristics and the electricity settlement period, the reservoir operation is divided into a plurality of operation periods in natural years, the virtual reservoir water level is continuously calculated in a rolling mode in the periods, and the initial water level is the actual operation water level of the reservoir.
2. The virtual reservoir water level staged and segmented continuous rolling calculation method as claimed in claim 1, wherein: the method is characterized by comprising the following steps:
(1) And (3) calculating water balance:
V i,t ＝V i,t-1 +(Q i,t -q i,t )*△t (1)
in formula 1:
V i,t is the storage capacity of a virtual reservoir t at one side;
V i,t-1 is the storage capacity of a virtual reservoir t-1 at one side; i is a left bank virtual reservoir when 1, and 2 is a right bank virtual reservoir;
Q i,t virtual warehouse-in flow when the flow is at one side t;
q i,t virtual delivery flow at one side t;
(2) Virtual warehouse-in calculation:
Q i,t ＝Q t *p i,t (2)
in formula 2:
Q i,t virtual warehouse-in flow when the flow is at one side t;
Q t the actual warehousing flow is t;
p i,t the electricity distribution ratio of the virtual reservoir at one side is t;
(3) Virtual ex-warehouse calculation:
if Q t <Full hair flow or Q t >Full flow and practically no water discard
q i,t ＝Eq i,t +△q i,t (3)
In formula 3:
Q t the flow is the warehousing flow at the actual time t;
q i,t virtual delivery flow at one side t;
Eq i,t the actual power generation flow is the actual power generation flow when a power station t is at one side;
Δq i,t the method is the delivery flow virtually generated for avoiding violating the constraint when a power station t on one side is used;
if Q t >Full flow and actual water discard:
q i,t ＝max(Eq i,t )+J i,t (4)
in formula 4:
Q t the flow is the warehousing flow at the actual time t;
q i,t virtual delivery flow at one side t;
max(Eq i,t ) The full-flow rate is generated when a power station t is at one side;
J i,t subtracting the maximum full-discharge flow from the actual waste water flow which is distributed in proportion when a power station t is at one side;
(4) Calculating the default virtual traffic:
only when the highest water level constraint and the minimum flow constraint are violated, calculating the violated virtual flow, wherein the violated virtual flow is zero when other constraints are violated and the constraint is not violated;
judging whether the highest water level constraint is met; calculating the flow;
judging whether the minimum flow constraint is met;
if Eq i,t <min Q i,t ，△q i,t ＝minq i,t -Eq i,t (5)
If Eq i,t >min Q i,t ，△q i,t ＝0 (6)
Other cases:
△q i,t ＝0 (7)。
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