CN117791744B - Power supply capacity configuration method of multi-energy complementary power generation system based on hydroelectric energy storage factory - Google Patents
Power supply capacity configuration method of multi-energy complementary power generation system based on hydroelectric energy storage factory Download PDFInfo
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Abstract
The invention belongs to the technical field of multi-energy complementary power generation, and discloses a power capacity configuration method of a multi-energy complementary power generation system based on a hydroelectric power storage factory, which comprises the steps of determining a plurality of construction forms of the hydroelectric power storage factory in the existing multi-energy complementary power generation system according to the power consumption and/or the operation characteristics of the existing multi-energy complementary power generation system; acquiring various capacity allocation schemes of the multi-energy complementary power generation system corresponding to each construction form; and simulating the scheduling operation process of each capacity configuration scheme by utilizing the joint scheduling model, and determining the capacity configuration scheme meeting the preset condition according to the scheduling operation process. The invention realizes the time shift and the utilization of the residual electric energy of the electric power system by the cascade cyclic utilization of the water quantity, and provides method support for river and mixed pumped storage power stations for implementing cascade hydroelectric development in the planning of construction forms and engineering scales; the method can be further applied to developing potential river basin analysis of the hydropower energy storage factory and constructing power supply configuration of the clean energy integrated base.
Description
Technical Field
The invention belongs to the technical field of multi-energy complementary power generation, and particularly discloses a power capacity configuration method of a multi-energy complementary power generation system based on a hydroelectric energy storage factory.
Background
In the novel power generation system, various energy sources such as water power, wind power, photovoltaic, thermal power, pumped storage, energy storage and the like are complementary, so that the contradiction between energy supply and demand is relieved, natural resources are reasonably protected, and the virtuous circle of ecological environment is promoted.
In order to construct a novel power generation system, the prior art can reform an established hydropower station to form a hybrid pumped storage power station, and then the hybrid pumped storage power station is combined with other energy sources to construct the novel power generation system. Under the background of a novel power system accessed by large-scale wind-light energy, the power system needs more flexible energy storage capacity, and the energy storage of the existing novel power generation system is realized by a built hybrid pumped storage power station, mainly based on the optimized scheduling of independent operation of the built hybrid pumped storage power station, and the problem of poor flexibility exists.
Disclosure of Invention
The invention aims to provide a power capacity configuration method of a multi-energy complementary power generation system based on a hydropower energy storage factory, which aims to solve the technical problem of poor energy storage flexibility of the existing novel power generation system.
The first aspect of the invention provides a power capacity configuration method of a multi-energy complementary power generation system based on a hydroelectric energy storage factory, which comprises the following steps:
step 1, determining a plurality of construction forms of a hydro-electric energy storage factory in an existing multi-energy complementary power generation system according to the surplus and/or running characteristics of electric power and electricity of the existing multi-energy complementary power generation system;
step 2, acquiring various capacity allocation schemes of the multi-energy complementary power generation system corresponding to each construction form;
And step 3, simulating a dispatching operation process of each capacity configuration scheme by utilizing a joint dispatching model, and determining the capacity configuration scheme meeting preset conditions according to the dispatching operation process.
Preferably, the existing multi-energy complementary power generation system comprises a cascade hydropower station and at least one of a thermal power station, a new energy power station, a pure pumped storage power station and an electrochemical power station.
Preferably, the operating characteristics include at least one of load characteristics of an existing multi-energy complementary power generation system, new energy output characteristics, and typical daily residual load characteristics.
Preferably, the method for determining the multiple construction forms of the hydroelectric energy storage factory in the existing multi-energy complementary power generation system according to the load characteristics of the existing multi-energy complementary power generation system specifically comprises the following steps:
Determining the peak shaving requirement and the energy storage power supply requirement of the existing multi-energy complementary power generation system according to the residual load characteristic of the existing multi-energy complementary power generation system;
and determining various construction forms of the hydroelectric energy storage factory in the existing multi-energy complementary power generation system according to the peak shaving requirement and the energy storage power supply requirement of the existing multi-energy complementary power generation system.
Preferably, after the step 1, the method further comprises:
According to the engineering construction conditions of the hydropower and energy storage factory under each construction form, the construction form capable of constructing the hydropower and energy storage factory is selected from a plurality of construction forms, and an alternative form set is obtained;
the step 2 specifically includes:
and acquiring various capacity allocation schemes of the multi-energy complementary power generation system corresponding to each construction form in the alternative form set.
Preferably, the step 2 specifically includes:
Acquiring the power supply type of the multi-energy complementary power generation system corresponding to each construction form;
And respectively drawing up the variation range and the step length of each power supply capacity to obtain a plurality of capacity allocation schemes corresponding to each construction form.
Preferably, the optimization objective of the joint scheduling model is to minimize both the water discard amount and the electricity shortage amount of each capacity allocation scheme.
Preferably, the optimization target of the joint scheduling model further comprises the minimum new energy waste amount and/or the minimum thermal power fuel cost.
Preferably, the constraint conditions of the joint scheduling model include power and electricity balance of each capacity allocation scheme, output constraint of the power station and water system constraint.
Preferably, the hydroelectric energy storage factory is obtained by adding at least one of an energy storage pump station, a reversible unit and a conventional hydroelectric expander on a cascade hydropower station in an existing multifunctional complementary power generation system.
Preferably, the preset condition is at least one of a power source utilization hour, an investment cost, an operation economy, safety and a new energy power rejection rate.
Compared with the prior art, the power capacity configuration method of the multi-energy complementary power generation system based on the hydroelectric energy storage factory has the following beneficial effects:
the invention firstly provides a concept of a hydropower station energy storage factory, and then optimizes the construction form and capacity configuration of the hydropower station energy storage factory in a multi-energy complementary power system, thereby providing basis for planning construction and operation of the hydropower station energy storage factory.
The invention realizes the time shift and the utilization of the residual electric energy of the electric power system by the cascade cyclic utilization of the water quantity, and provides method support for river and mixed pumped storage power stations for implementing cascade hydroelectric development in the planning of construction forms and engineering scales; the method can be further applied to potential river basin analysis of a hydropower energy storage factory and power supply configuration of a clean energy integrated base.
Drawings
FIG. 1 is a flow chart of a method for configuring the power capacity of a multi-energy complementary power generation system based on a hydroelectric energy storage plant according to an embodiment of the invention;
FIG. 2 is a detailed flow chart of a method for configuring the power capacity of a multi-energy complementary power generation system based on a hydroelectric energy storage plant according to an embodiment of the present invention;
FIG. 3 is a schematic view of a construction of a hydroelectric energy storage plant according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a process of energy storage and peak shaving implemented by an energy storage pump station according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a reversible unit for storing energy and regulating peak in an embodiment of the present invention;
FIG. 6 is a schematic diagram of a conventional hydro-electric expander implementing energy storage and peak shaving in an embodiment of the present invention;
FIG. 7 is a schematic diagram of a possible scenario of power market space analysis in an embodiment of the present invention;
FIG. 8 is a schematic diagram of a possible scenario of residual loads of a conventional multi-energy complementary power generation system according to an embodiment of the present invention;
FIG. 9 is a graph of residual load of a typical power system according to an embodiment of the present invention, where (a) is a graph of residual load of a typical power system with large peak shaver capacity, long time period, large energy storage capacity, medium time period, etc.; (b) The residual load diagram is a residual load diagram with large peak regulation capacity, short duration, large energy storage capacity and long duration in a typical power system; (c) The residual load diagram is a residual load diagram with large peak regulation capacity, long time length, small energy storage capacity and short time length in a typical power system; (d) The method is a residual load diagram with small peak regulation capacity, short duration, large energy storage capacity, medium duration and the like in a typical power system.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
The first aspect of the present invention provides a method for configuring power capacity of a multi-energy complementary power generation system based on a hydroelectric power storage plant, and in particular relates to a method for selecting a construction form and configuring power capacity of a multi-energy complementary power generation system based on a hydroelectric power storage plant, as shown in fig. 1 and 2, including:
and step 1, determining various construction forms of the hydro-electric energy storage factory in the existing multi-energy complementary power generation system according to the electric power and electricity surplus and/or operation characteristics of the existing multi-energy complementary power generation system.
The hydroelectric energy storage factory in the embodiment of the invention is obtained by adding at least one of an energy storage pump station, a reversible unit and a conventional hydroelectric expander on a cascade hydropower station in an existing multifunctional complementary power generation system.
Illustratively, the structure of a hydroelectric energy storage plant is shown in fig. 3.
The energy storage factory based on the hydropower station (for short, the hydropower energy storage factory) is a large-scale or large-scale water energy storage facility aggregate constructed by depending on a cascade hydropower station, the construction form comprises an energy storage pump station, a reversible unit, a conventional hydroelectric expander or a combination of more than two modes, wherein the hydropower station, the conventional unit and the reversible unit have a generating function and can convert water into electric energy, the energy storage pump station and the reversible unit can receive electric power to pump the water from a lower reservoir to an upper reservoir and convert the electric energy into potential energy of the water; the water and electricity energy storage factory realizes time shift and deep utilization of residual electric energy in a water quantity cascade cyclic utilization mode.
The functions undertaken by the hydroelectric energy storage factory in the power system are mainly as follows: (1) The energy storage pump station can pump water when the system load is low and new energy is greatly generated, and converts electric energy into potential energy of water for storage; the water drawn during peak system load is generated by the reservoir generator set as shown in fig. 4. The energy storage pump station mainly has the functions of long period, flexible energy storage and pumping phase modulation, and can also provide certain electric quantity for the system, and the power generation function is completed by a conventional generator set sharing a reservoir. (2) The reversible unit can pump water in the period of low system load and large new energy generation and rejection, and converts redundant electric energy into potential energy of water for storage; generating power at peak system load increases peak shaving capacity as shown in fig. 5. The reversible unit has the functions of long period, flexible energy storage, peak regulation, valley filling, frequency modulation, phase modulation and emergency standby. (3) The conventional hydroelectric expander increases the installed capacity of the original hydropower station, can generate electricity and increase peak regulation capacity at the time of system load peak, and mainly has a peak regulation function; the hydroelectric power output of the new energy source in the period of large emission and low load valley can be reduced, so that the occupation of the hydroelectric power station output on the new energy source output is reduced, and the effect of promoting the new energy source to be consumed is realized, as shown in fig. 6.
The surplus and the deficiency of the electric power and the electric quantity are determined according to analysis of the planned horizontal annual electric power market space of the multi-energy complementary power generation system to be served by the hydroelectric power storage factory.
By way of example, fig. 7 shows a possible scenario for planning a horizontal annual power market space analysis of a multi-energy complementary power generation system to be served by a hydroelectric power storage plant, in practice, the construction form of the hydroelectric power storage plant should be selected appropriately according to the power generation system requirements, according to the functional roles of the power storage plants of the different construction forms.
The existing multi-energy complementary power generation system comprises a cascade hydropower station and at least one of a thermal power station, a new energy power station, a pure pumped storage power station and an electrochemical power station.
Wherein the new energy power station comprises a wind power station and/or a photovoltaic power station.
The operating characteristics include at least one of load characteristics of the existing multi-energy complementary power generation system, new energy output characteristics and typical daily residual load characteristics.
According to the embodiment of the invention, the construction form and the approximate selection range of the energy storage duration of the hydroelectric energy storage factory required by the existing multi-energy complementary power generation system are obtained by analyzing the system load characteristic, the output characteristic of new energy sources such as wind power, photovoltaic and the like and the residual load characteristic of a typical solar system.
The method for determining the multiple construction forms of the hydroelectric energy storage factory in the existing multi-energy complementary power generation system according to the load characteristics of the existing multi-energy complementary power generation system specifically comprises the following steps:
s1, determining the peak shaving requirement and the energy storage power supply requirement of the existing multi-energy complementary power generation system according to the residual load characteristic of the existing multi-energy complementary power generation system.
S2, determining various construction forms of the hydroelectric energy storage factory in the existing multi-energy complementary power generation system according to the peak shaving requirement and the energy storage power supply requirement of the existing multi-energy complementary power generation system.
In the embodiment of the invention, the residual load characteristic analysis method of the existing multi-energy complementary power generation system is adopted to determine the peak shaving requirement and the energy storage power supply requirement of the existing multi-energy complementary power generation system, and then various construction forms of the hydro-electric energy storage factory in the existing multi-energy complementary power generation system are determined according to the peak shaving requirement and the energy storage power supply requirement of the existing multi-energy complementary power generation system.
Illustratively, the residual load characteristic analysis is specifically: firstly, selecting typical days for planning horizontal annual load and new energy output of an existing multi-energy complementary power generation system, obtaining the conditions of system power shortage and new energy power abandonment according to the annual load and the necessary output of a power supply with a determined scale in the existing multi-energy complementary power generation system, and finally drawing a residual load curve. FIG. 8 shows a possible scenario of system residual load analysis, FIG. 9 shows several typical power system residual load patterns, the systems shown in FIG. 9 (a) and FIG. 9 (b) have larger capacity requirements for peak shaving and energy storage, and it is recommended to build energy storage factories in the form of reversible units, pumped storage and other power sources; the power system of fig. 9 (c) has an effective large peak shaving demand, a short-time small energy storage demand, and recommends construction of energy storage factories and electrochemical energy storage power supplies in the form of conventional hydro-electric expanders; in fig. 9 (d), the power system has a large energy storage requirement and a small peak shaving requirement, and it is recommended to construct an energy storage pump station, a reversible unit or a combination of a conventional hydro-electric expander and pumped storage.
The invention combines the space analysis of the electric power market and the analysis of the typical daily residual load of the system, can judge the requirements of the existing multi-energy complementary power generation system on peak shaving, energy storage duration and power capacity, and accordingly selects reasonable peak shaving, energy storage power supply type and capacity range to draw the power supply configuration alternative scheme in the subsequent step 2.
In order to reduce the data size and increase the operation speed, the embodiment of the invention further includes, after step 1 and before step 2:
and screening out the construction forms capable of constructing the hydroelectric energy storage factory from a plurality of construction forms according to engineering construction conditions of the hydroelectric energy storage factory under each construction form to obtain an alternative form set.
According to the embodiment of the invention, the construction conditions of the hydroelectric energy storage factory project are analyzed, the construction forms capable of constructing the hydroelectric energy storage factory are screened out from a plurality of construction forms according to the characteristics of the hydroelectric engineering such as reservoir regulation performance, the topographic and geological conditions of the build-up and build-out projects, and the alternative capacity range of the energy storage factory is drawn out to obtain an alternative form set.
Step 2, obtaining various capacity allocation schemes of the multi-energy complementary power generation system corresponding to each construction form, wherein the method specifically comprises the following steps:
and 2.1, obtaining the power supply type of the multi-energy complementary power generation system corresponding to each construction form.
Illustratively, one form of construction corresponds to a viable configuration in a multi-energy complementary power generation system including hydroelectric energy storage plants (reversible units or energy storage pump stations), purely pumped storage power stations, and electrochemical energy storage power stations.
And 2.2, respectively drawing up the variation range and the step length of each power supply capacity to obtain a plurality of capacity allocation schemes corresponding to each construction form.
When the alternative form set is provided, step 2 specifically includes: and acquiring various capacity allocation schemes of the multi-energy complementary power generation system corresponding to each construction form in the alternative form set.
Step 3, simulating a scheduling operation process of each capacity configuration scheme by using a joint scheduling model, and determining the capacity configuration scheme meeting preset conditions according to the scheduling operation process, wherein the method specifically comprises the following steps:
and 3.1, simulating the scheduling operation process of each capacity configuration scheme by using a joint scheduling model.
Illustratively, the present invention may utilize a joint scheduling model to simulate the annual scheduling operation of each capacity allocation scheme, specifically: scheduled runs for each capacity configuration scheme were simulated based on a 8760 hour annual time schedule run.
The optimization goal of the joint scheduling model is that the water discarding amount and the electricity shortage amount of each capacity allocation scheme are minimum.
When the capacity allocation scheme relates to a new energy power station and/or a thermal power station, the optimization target of the joint scheduling model further comprises the minimum new energy waste amount and/or the minimum thermal power fuel cost.
Constraint conditions of the joint scheduling model in the embodiment of the invention comprise electric power and electricity balance of each capacity allocation scheme, output constraint of a power station and water system constraint.
Illustratively, the power-charge balance constraint is as in equation (1):
（1）
In the method, in the process of the invention, For thermal power station/>At/>The output of the time period; /(I)For hydropower station/>At/>The output of the time period; /(I)For wind power station/>At/>Grid-connected output in a period; /(I)For photovoltaic power station/>At/>Grid-connected output in a period; /(I)And/>Respectively pumped storage power station/>At/>Generating electricity and pumping out force in a period; /(I)For system/>Load demand for the time period.
Illustratively, the hydropower station's output constraints and water system constraints are shown in equations (2) through (6).
Hydropower station output description and water balance:
（2）
（3）
Hydropower station flow and reservoir capacity boundary conditions:
（4）
（5）
In the method, in the process of the invention, For hydropower station/>Is a coefficient of force; /(I)，/>，/>，/>And/>Hydropower station/>, respectivelyAt the position ofNatural incoming flow, power generation flow, waste water flow, power generation head and reservoir capacity in a period; /(I)，/>，/>，/>Hydropower station/>, respectivelyUpper and lower bounds of the storage capacity and the excess flow.
Controlling the water yield of a hydropower station:
（6）
In the method, in the process of the invention, For hydropower station/>The water yield control period of the water tank; /(I)For hydropower station/>In/>And controlling the output flow of the period. For a daily-adjustment hydropower station, the water level control period is one day; for both quaternary and annual regulated hydropower stations, monthly water output control is performed according to the long term scheduling rules therein.
Illustratively, the force constraints and water system constraints of the pumped-hydro power station are as in equations (7) through (14).
The following constraint conditions are applicable to construction forms such as pure pumped storage, mixed pumped storage, energy storage pump stations and the like.
Water balance of the upper reservoir and the lower reservoir:
（7）
（8）
Pumping/generating power description of a pumped storage unit:
（9）
（10）
the pumped storage unit cannot pump water and generate electricity at the same time:
（11）
（12）
（13）
the pumping water quantity and the power generation water quantity in the adjustment period of the pumped storage power station are balanced:
（14）
In the method, in the process of the invention, And/>Is 0, 1 variable,/>Time pumped storage power station/>At/>Pumping out force in period,/>Time pumped storage power station/>At/>Generating power in a period of time; /(I)And/>Respectively pumping and generating working condition coefficients; /(I)，/>，/>And/>Respectively pumped storage power station/>At/>Pumping flow, generating flow, pumping output and generating output in the period; /(I)And/>Respectively pumped storage power station/>At/>Natural flow of reservoirs up and down in time period; /(I)AndThe power generation flow rates of the hydropower stations of the upper reservoir and the lower reservoir are respectively; for pure pumped storage, the upper reservoir and the lower reservoir do not utilize the existing hydropower station reservoir, so that/>, is not consideredAnd/>。/>And/>The water disposal amounts of the upper reservoir and the lower reservoir are respectively; /(I)And/>The reservoir capacities of the upper reservoir and the lower reservoir of the pumped storage power station are respectively; /(I)And/>Respectively pumped storage power station/>At/>Pumping lift and generating head in time period; For pumped storage power station/> Is provided. In addition, the reservoir capacity constraint of the pumped storage power station, the pumping/power generation output constraint, the flow constraint and the like are required to be met.
For the hydroelectric energy storage factory in the form of an energy storage pump station/a reversible unit, the upper reservoir and the lower reservoir are established reservoirs, the pumped storage pump station/a water pumping pump station and a conventional hydroelectric unit have a hydraulic coupling relationship, and the hydroelectric energy storage factory is characterized in that,And/>Respectively correspond to/>And/>；/>And/>Respectively correspond to/>And/>；/>And/>Respectively correspond to/>And/>；/>And/>Respectively correspond to/>And/>; Wherein/>And/>Index numbers of hydropower stations of the upper reservoir and the lower reservoir respectively. In addition, the water pumping and power generation water quantity of the energy storage factory unit should be considered when the lower drainage flow of the upper reservoir and the lower reservoir is controlled.
Illustratively, the output constraints of the electrochemical energy storage power station are as in equations (15) through (20):
（15）
（16）
（17）
（18）
（19）
（20）
In the method, in the process of the invention, And/>Is 0, 1 variable,/>Time electrochemical energy storage/>At/>The time period is charged up,Time electrochemical energy storage/>At/>Discharging in a time period; /(I)And/>Electrochemical energy storage/>, respectivelyCharge and discharge efficiency; /(I)For electrochemical energy-storage power station/>At/>The amount of electricity in the time period; /(I)And/>Chemical energy storage/>, respectivelyAt/>Charging and discharging power of the period; /(I)For electrochemical energy-storage power station/>Is set to the maximum power of (a).
Illustratively, the thermal power plant's output constraints are as in equations (21) through (24).
And (5) limit of climbing speed of the thermal power generating unit:
（21）
Thermal power output boundary condition:
（22）
（23）
（24）
In the method, in the process of the invention, And/>Respectively is a thermal power station/>The output climbing and load shedding rate of the hydraulic pump; /(I)And/>Respectively, thermal power stationsAt/>Minimum and maximum output force at time; /(I)For thermal power station/>At/>Starting up quantity at moment; /(I)For thermal power station/>Is a single machine capacity; /(I)And indexing the start-stop period of the thermal power generating unit, wherein the thermal power is used for controlling the number of the start-up units according to the start-stop period.
Wind power and photovoltaic power source power boundary conditions such as formula (25) and formula (26):
（25）
（26）
In the method, in the process of the invention, For wind farm/>At/>Actual output of the time period; /(I)For photovoltaic power station/>At/>Actual force of the time period.
And 3.2, determining a capacity configuration scheme meeting preset conditions according to the scheduling operation process.
The preset condition is at least one of the number of power utilization hours, investment cost, operation economy, safety and new energy power rejection rate.
For example, 8760h time sequence operation simulation is carried out on various power supply combinations, and under various construction forms and capacity allocation schemes of the energy storage factory according to simulation operation results, the electricity shortage risk and economic benefit of the multi-energy complementary power generation system and the influence of the construction of the hydroelectric energy storage factory on the operation of the cascade reservoir, such as caused water level fluctuation, reservoir power generation amount change and the like, are evaluated.
And comprehensively comparing indexes such as power construction investment cost, operation economy, safety, power utilization hours, new energy electricity rejection rate and the like of each scheme to obtain a recommended power configuration scheme, including a recommended construction form and a capacity configuration scheme of the hydro-electric energy storage factory.
The existing multi-energy complementary power generation system still takes the independent operation of the built hybrid pumped storage power station as the main of medium-long term optimization scheduling, the construction form of the hydroelectric energy storage factory is not clearly defined or defined under the construction background of a novel power system with multiple energy complementation, and a systematic method for the construction form selection and capacity allocation of the hydroelectric energy storage factory is not proposed. The invention provides the definition of the hydroelectric energy storage factory clearly, and simultaneously provides a method for selecting the construction form and configuring the capacity of the hydroelectric energy storage factory in a 'water, fire and wind energy storage' multi-energy complementary system from the aspects of power system demand analysis, construction conditions, economic benefit evaluation and the like, and provides method support for river and mixed pumped storage power stations for implementing cascade hydroelectric development in the construction form and engineering scale planning of the river and mixed pumped storage power stations; the method can be further applied to potential river basin analysis of a hydropower energy storage factory and power supply configuration of a clean energy integrated base.
Under the background of a novel power system accessed by large-scale wind-light energy, the power generation system is more required to have flexible energy storage capacity with multiple time scales, the energy storage transformation of a conventional hydropower station is needed to be researched, the problems of construction form and capacity configuration selection of a hydropower station energy storage factory are solved, and the flexible adjustment capacity of the hydropower station energy storage factory on different time scales is excavated. In the novel electric power system, various energy sources such as water power, wind power, photovoltaic, thermal power, pumped storage, energy storage and the like are complementary, an energy storage factory of the hydropower station and the cascade hydropower station are in mutual coupling hydraulic connection, the operation of the energy storage factory is influenced by factors such as storage capacity, regulation characteristics and comprehensive utilization requirements of the cascade hydropower station, and the construction form selection and the operation mode of the energy storage factory are still to be studied deeply. The invention firstly provides a concept of a hydropower station energy storage factory, and then optimizes the construction form and capacity configuration of the hydropower station energy storage factory in a multi-energy complementary power system, thereby providing basis for planning construction and operation of the hydropower station energy storage factory.
The method of the present invention will be described in more specific examples.
Taking a construction of a hydroelectric energy storage factory (hereinafter referred to as a Dragon-sheep isthmus energy storage factory) by taking a yellow river upstream Dragon Yang Xia-Lasiwa cascade hydroelectric power station as an example, under the condition of different power system load characteristics and power supply structures, the form selection and capacity configuration of the hydroelectric energy storage factory are subjected to case analysis.
TABLE 1 Main parameters of Longyangxia, lasiwa hydropower station
(A) Service Qinghai power grid and delivery
(1) Basic data
According to prediction, the maximum load 1630 kW of Qinghai province in 2030 is generated in 12 months, the electricity demand is 1150 hundred million kWh, three outgoing channels are considered, the maximum outgoing power is 2400 kW, and the total load curve of the system is drawn.
The expected installed capacity 393 ten thousand kW for Qinghai province power in 2030; 1765 kW of hydroelectric installation (144 kW of radial hydropower contained); considering a Longxian hydroelectric energy storage factory and a pumped storage power station, the estimated scale in 2030 reaches 1200 ten thousand kW at the highest; the electrochemical energy storage construction scale is 758 ten thousands kW, and the energy storage time is 2 hours; the wind power installation scale reaches 3000 ten thousand kW, and the photovoltaic installation scale reaches 7000 ten thousand kW. Considering the exchange of electric power and electric quantity with the regional power grid, the maximum exchange capacity is 1000 ten thousand kW.
(2) Power market space analysis
The space analysis of the electric power market is carried out on Qinghai, the system power deficiency is 1821 ten thousand kW, but large-scale new energy source is realized for grid-connected power generation, the surplus 266 hundred million kWh electric quantity of the system electric quantity is generated at the moment, a large amount of new energy source is abandoned, the electric quantity cannot be reasonably utilized, and an energy storage power source is urgently needed. In combination with the Qinghai energy conservation resource profile and the power supply planning, the electric power gap is mainly solved by accelerating the construction of a pumped storage power supply, fully excavating the benefit of the water and electricity capacity of the stock, moderately supplementing an emergency standby power supply (such as a gas power station) or through power grid exchange.
(3) Hydropower energy storage factory and pumped storage capacity configuration scheme
The capacity proportioning scheme of the system pumped storage and the LongShS energy storage factory is shown in Table 2, the construction scale of the LongShS energy storage factory is obtained by researching a feasibility analysis report of the LongShS energy storage factory to a reasonable range, and unit kilowatt investment and operation rate are obtained by referring to feasibility research reports of pumped storage and new energy construction projects in Qinghai region.
Table 2 capacity allocation scheme for serving Qinghai power grid, and delivering pumped storage and Longyang isthmus energy storage factory
(4) Evaluation of protocol economy
According to the power capacity allocation scheme, three energy storage factories in the construction forms of an energy storage pump station, a reversible unit and a conventional hydro-electric expander are respectively formulated, and 150 power combination schemes of the water storage factory and the hydro-electric energy storage factory are formulated in total. And carrying out 8760h production simulation on the power system according to the multi-scale joint scheduling model of the multi-energy complementary system for each power supply configuration scheme, and calculating the current value of the total cost, wherein the optimal power supply configuration schemes of three construction forms of the hydropower energy storage factory are shown in table 3. Therefore, compared with an energy storage pump station and a conventional hydro-electric expander, the energy storage system can reduce the system electricity shortage to a greater extent, and the energy storage factory in the form of the reversible unit is recommended to have the capacity of 120 ten thousand kW from the comparison of the engineering construction conditions and the current value of the total cost of the system operation.
Table 3 service Qinghai power grid and capacity allocation economical optimization scheme of outgoing pumped storage Longxia energy storage factory
(B) Service Qinghai power grid internal demand
(1) Basic data
The maximum load 1630 kW in Qinghai province in 2030 occurs in 12 months with electricity demand of 1150 hundred million kWh. In terms of power supply composition, the service Qinghai power grid hydroelectric installation is 1303 kilokW. The wind power installation scale is 960 ten thousand kW, and the photovoltaic installation scale is 3000 ten thousand kW. Other data are the same as those sent out by the service Qinghai power grid.
(2) Power market space analysis
The space analysis of the electric power market is carried out on the Qinghai electric network, the electric power deficiency of the system is 106 kilowatts, the surplus electric quantity is 154.2 hundred million kWh, the Qinghai electric network has a small amount of electric power deficiency, and meanwhile, a large amount of new energy is abandoned, so that the system needs to be supplemented with an energy storage and peak shaving power supply. The power capacity allocation scheme alternative set is formulated according to the supplement mainly through pumped storage power supply and an energy storage factory.
(3) Hydropower energy storage factory and pumped storage capacity configuration scheme
The capacity proportioning scheme of the system pumped storage and the Longyang isthmus hydroelectric energy storage factory is shown in table 4.
Table 4 service Qinghai electric network pumped storage and Longyang isthmus energy storage factory capacity allocation scheme
(4) Evaluation of protocol economy
And (3) carrying out 8760h time sequence production simulation of the power system for each power supply configuration scheme according to the power supply capacity configuration scheme, and calculating the total cost present value, wherein the optimal power supply configuration schemes of the three construction forms of the energy storage factory are shown in table 5. The recommended construction schemes are that the system power shortage occurs, the new energy power rejection rate is equivalent, and the energy storage factory in the form of an energy storage pump station is recommended to have the capacity of 100 ten thousand kW from the current value comparison of the total cost of system construction and operation.
Table 5 optimization scheme for capacity allocation economy of Qinghai power grid pumped storage Longsheep isthmus energy storage factory
(C) Servicing other power systems
(1) Basic data
The maximum load 5453 kW of the selected power grid 2030 is predicted to occur in 7 months with a power requirement of 2901 hundred million kWh. The installed capacity of the thermal power of the power grid is 3960 kilokW; the hydroelectric installation is 692 ten thousand kW; the electrochemical energy storage construction scale is 396 ten thousand kW, and the energy storage time is 2 hours; the wind power installation scale is 800 ten thousand kW, and the photovoltaic installation scale is 3000 ten thousand kW.
(2) Power market space analysis
And the power market space analysis is carried out on the power grid, the power deficiency of the system is 1538 kilowatts, the surplus electric quantity is 22 hundred million kWh, and meanwhile, the peak-valley difference of the load of the power grid is large, so that the system needs to supplement peak regulation capacity. The power gap is considered to be mainly supplemented through a pumped storage power supply and an energy storage factory, and meanwhile, temporary power shortage is established through emergency thermal power supplement, so that a power capacity allocation scheme alternative set is formulated.
(3) Energy storage factory and pumped storage capacity configuration scheme
The capacity proportioning scheme of the system pumped storage and the LongShS energy storage factory is shown in Table 6, the construction scale of the LongShS energy storage factory is obtained by researching a feasibility analysis report of the LongShS energy storage factory to a reasonable range, and unit kilowatt investment and operation rate are obtained by referring to feasibility research reports of pumped storage and new energy construction projects in Qinghai region.
Table 6 service capacity allocation scheme of other power grid pumped storage and Longyang isthmus energy storage factory
(4) Evaluation of protocol economy
And carrying out 8760h production simulation of the power system according to the power capacity allocation schemes, and calculating the total cost present value, wherein the optimal power allocation schemes of three construction forms of the hydropower energy storage factory are shown in table 7. Therefore, compared with an energy storage pump station, the energy storage factory in the form of the conventional hydroelectric generating set is recommended to have the capacity of 140 ten thousand kW from the current value comparison of the total cost of system construction and operation.
Table 7 service other electric network pumped storage Longxia energy storage factory capacity allocation economical optimization scheme
The form and capacity configuration of different power systems served by the Longsheep isthmus energy storage factory are researched by adopting a form selection and capacity configuration method framework of the hydroelectric energy storage factory. The main conclusion is as follows:
(1) Service Qinghai electric wire netting and delivery system: the peak-valley difference of the system load is smaller, the power deficiency is 1821 kilokW, the surplus 266 hundred million kWh electric quantity of electric quantity exists a large amount of power deficiency and surplus electric quantity, and the peak regulation and energy storage power supply needs to be supplemented. Through power scheme comparison selection, it is recommended that the dragon Yang Xia-Lashiwa step is used for constructing a 120-kilowatt reversible unit and simultaneously a 440-kilowatt pumped storage unit.
(2) Service green sea electric wire netting: the system has 106 kW of power deficiency, the surplus electric quantity is 154.2 hundred million kWh, a small amount of power deficiency exists, a large amount of new energy is discharged, and an energy storage power supply is mainly needed to be supplemented. Through power scheme comparison selection, it is recommended that a dragon Yang Xia-Lashiwa step is built for a 100-kilowatt energy storage pump station, and a 200-kilowatt pumped storage pump station is built.
(3) Serving other grids: the peak-valley difference of the system load is larger, the power deficiency of the system is 1538 ten thousand kW, the power deficiency of the system is 129 hundred million kWh, and the system needs to supplement the power supply capacity to provide power and power. Through power scheme comparison selection, it is recommended that a dragon Yang Xia-Lashiwa step is constructed to 140 ten thousand kW conventional hydro-electric expanders, and simultaneously 860 ten thousand kW pumped storage is constructed.
The energy storage factory based on the hydropower station is a specific category of energy storage facilities, and the energy storage facilities such as an energy storage pump station, a reversible unit or a conventional hydroelectric expander are built by using the river basin cascade hydropower station as an upper warehouse and a lower warehouse to form an aggregate similar to the factory, wherein the upper cascade reservoir and the lower cascade reservoir of each energy storage facility are equivalent to a workshop of the factory, so that the purposes of large-scale long-time energy storage and cascade recycling of water energy are achieved. It is now defined as follows: the energy storage factory based on the hydropower station is a large-scale or large-scale water energy storage facility aggregate built by means of a cascade hydropower station, the building form comprises an energy storage pump station built by up-and-down stairs or multiple stairs, a reversible unit, a conventional hydro-electric expander or a combination of more than two modes, and the time shifting and deep utilization of residual electric energy are realized in a mode of cascade cyclic utilization of energy storage water quantity. Compared with a pumped storage power station, the energy storage factory has the advantages of large capacity, long regulation period (can achieve quaternary regulation and annual regulation), short construction period and the like, can be used as a good peak regulation and energy storage power supply to participate in multi-energy complementary power generation, and provides important support for the collaborative development of clean energy.
According to the thought of combining hydraulic connection and electric connection, the invention carries out system analysis on the connotation of a hydropower energy storage factory based on the nature of 'water energy storage' and the regulation function of hydropower per se, and is a large-scale or large-scale water energy storage facility aggregate built by a hydropower station, the building form relates to a power station building energy storage pump station, a reversible unit and a conventional hydroelectric expander of which are built up and down or a plurality of steps, or the combination of two or more modes, and the time shifting and the utilization of the residual electric energy of an electric power system are realized in a water quantity step recycling mode.
The invention provides a construction form selection and capacity allocation method based on a hydropower station construction energy storage factory, which comprises the steps of determining the requirements of a system on energy storage and peak regulation capacity and time length and the construction conditions of the energy storage factory according to space analysis and residual load analysis of a system electric power market, determining capacity allocation schemes of various energy storage factories, and constructing a water, fire, wind and light energy storage multi-energy complementary system; aiming at each energy storage factory construction form and capacity allocation scheme, constructing a multi-scale joint scheduling model of a water, fire, wind and light storage complementary system facing the regional complex power grid, and simulating a annual 8760h scheduling operation process of the multi-energy complementary system after cascade hydroelectric is added with the energy storage factory; and evaluating risks and benefits of complementary systems in the aspects of system safety, economy, reservoir operation and the like under the capacity allocation schemes of the energy storage factories in different construction forms, and selecting the construction form and the capacity allocation scheme of the water, fire, wind, light and energy storage complementary energy storage factories with feasible technology and optimal benefits. The invention can be applied to rivers and hybrid pumped storage power stations which are subjected to cascade hydropower development in China, and provides method support in planning and research of construction forms and engineering scales of the rivers and hybrid pumped storage power stations; the method can be further applied to potential river basin analysis of a hydropower energy storage factory and power supply configuration of a clean energy integrated base.
While the invention has been described in terms of preferred embodiments, it will be understood by those skilled in the art that various changes and modifications can be made without departing from the scope of the invention, and it is intended that the invention is not limited to the specific embodiments disclosed.
Claims (3)
1. A power capacity configuration method of a multi-energy complementary power generation system based on a hydropower energy storage factory is characterized by comprising the following steps:
step 1, determining a plurality of construction forms of a hydro-electric energy storage factory in an existing multi-energy complementary power generation system according to the surplus and/or running characteristics of electric power and electricity of the existing multi-energy complementary power generation system;
The operation characteristics comprise at least one of load characteristics, new energy output characteristics and typical daily residual load characteristics of the existing multi-energy complementary power generation system;
The hydroelectric energy storage factory is obtained by adding at least one of an energy storage pump station, a reversible unit and a conventional hydroelectric expander on a cascade hydropower station in an existing multi-energy complementary power generation system;
The construction form is as follows: when the peak shaving and energy storage are required to have larger capacity, an energy storage factory and a pumped storage power supply in the form of a reversible unit are built; when the power system has larger demand on peak regulation and the energy storage demand is short-time small capacity, an energy storage factory and an electrochemical energy storage power supply in the form of a conventional hydro-electric expander are built; when the power system has a large energy storage requirement and a small amount of peak shaving requirement, an energy storage pump station, a reversible unit or a combination of a conventional hydroelectric expander and pumped storage is built;
step 2, acquiring various capacity allocation schemes of the multi-energy complementary power generation system corresponding to each construction form;
step 3, simulating a scheduling operation process of each capacity configuration scheme by utilizing a joint scheduling model, and determining the capacity configuration scheme meeting preset conditions according to the scheduling operation process;
the optimization objective of the joint scheduling model is that the water discarding amount and the electricity shortage amount of each capacity allocation scheme are minimum, the new energy electricity discarding amount is minimum and/or the thermal power fuel cost is minimum; constraint conditions of the joint scheduling model comprise electric power and electricity balance of each capacity allocation scheme, output constraint of a power station and water system constraint;
The existing multi-energy complementary power generation system comprises a cascade hydropower station and at least one of a thermal power station, a new energy power station, a pure pumped storage power station and an electrochemical power station;
According to the load characteristics of the existing multi-energy complementary power generation system, determining a plurality of construction forms of a hydro-electric energy storage factory in the existing multi-energy complementary power generation system specifically comprises the following steps:
Determining the peak shaving requirement and the energy storage power supply requirement of the existing multi-energy complementary power generation system according to the residual load characteristic of the existing multi-energy complementary power generation system;
according to the peak shaving requirement and the energy storage power supply requirement of the existing multi-energy complementary power generation system, determining a plurality of construction forms of a hydroelectric energy storage factory in the existing multi-energy complementary power generation system;
The residual load characteristic is determined in the following manner: firstly, selecting typical days for planning horizontal annual load and new energy output of an existing multi-energy complementary power generation system, obtaining the conditions of system power shortage and new energy power abandonment according to the annual load and the necessary output of a power supply with a determined scale in the existing multi-energy complementary power generation system, and finally drawing a residual load curve.
2. The method for configuring the power capacity of a hydroelectric energy storage plant based on a multi-energy complementary power generation system according to claim 1, further comprising, after the step 1:
According to the engineering construction conditions of the hydropower and energy storage factory under each construction form, the construction form capable of constructing the hydropower and energy storage factory is selected from a plurality of construction forms, and an alternative form set is obtained;
the step 2 specifically includes:
and acquiring various capacity allocation schemes of the multi-energy complementary power generation system corresponding to each construction form in the alternative form set.
3. The method for configuring the power capacity of the multi-energy complementary power generation system based on the hydroelectric energy storage plant according to claim 1, wherein the step 2 specifically comprises:
Acquiring the power supply type of the multi-energy complementary power generation system corresponding to each construction form;
And respectively drawing up the variation range and the step length of each power supply capacity to obtain a plurality of capacity allocation schemes corresponding to each construction form.
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