CN111934365B - Energy storage system of energy base and working method thereof - Google Patents
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
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Abstract
The invention discloses an energy storage system of an energy base and a working method thereof, and the energy storage system comprises a photovoltaic power generation system, a wind power generation system, a thermal power generation system, a hydraulic power generation system, an energy storage system, a thermal user, an electric network and a control system, wherein the wind power generation system, the thermal power generation system, the hydraulic power generation system and the energy storage system are all connected with the electric network through an outgoing line, the energy storage system is connected with the thermal user, the control system is connected with the photovoltaic power generation system, the hydraulic power generation system, the thermal power generation system, the wind power generation system and the energy storage system, and the energy storage system and the working method thereof can realize the coordinated operation of the energy storage system and each power supply of the energy base according to the power supply configuration and operation condition and the power network scheduling requirement.
Description
Technical Field
The invention belongs to the technical field of energy storage, and relates to an energy storage system of an energy base and a working method thereof.
Background
With the development of energy transformation in China, the energy production and consumption revolution is promoted, and a clean, low-carbon, safe and efficient energy system is constructed, so that the method is the direction of energy transformation development. Electric energy is an important component for constructing the energy system, is an important form for clean and efficient utilization of energy, and is a key path for constructing the energy system, so that the electric energy is a common consensus and a consistent action of countries in the world and first-class energy enterprises at home and abroad.
The concept of "re-electrification" includes two aspects, one of which is in the energy production link, mainly embodied by the large-scale development and utilization of clean and efficient energy. According to the prediction of the international renewable energy agency, the proportion of renewable energy power generation to global power generation is increased from 26% to 85% by 2050. By the end of 2019, the wind power and solar energy installation accounts for 20.6% of the total capacity of the power generation installation in China, and according to the forecast of the energy research institute of the State development and improvement Commission, the proportion of the wind power and solar energy installation in China in 2050 can reach 69%. The natural structure of the energy resources rich in coal, poor in oil and less in gas in China defines the difficulty degree of the China in the process of constructing a clean, low-carbon, safe and efficient energy system.
In order to accelerate the process of're-electrification', a clean low-carbon, safe and efficient energy system taking clean energy as a main body is constructed, the external environment for developing new energy in China is greatly changed at present, the market cultivation period driven by policy enters the development stage of technology and market 'double-wheel', and a large-scale and intensive construction of a large-scale energy base is realized, so that the method is one of the most important means for vigorously developing clean energy.
There are studies conducted by several scholars or units:
the chinese patent CN104300566A proposes an optimal configuration method for loosening the bottleneck of centralized wind power delivery and transmission by using a large-scale energy storage system, and aims to maximize the comprehensive benefits of the energy storage system, perform conventional economic analysis, and optimally configure the power measurement of the energy storage system. This patent protection is different from the method of this patent which involves multiple forms of power supply, targeting overall power quality and economic benefits of the energy base.
Chinese patent CN107171357A proposes a wind-solar energy storage optimal configuration composite control method, which determines and corrects the output power of a wind-solar energy storage electric field and reduces the fluctuation of the wind-solar energy storage power. The protection content of the patent is different from the configuration and working method which simultaneously considers various power supply inputs, various energy storage aids and various parameter controls (stability and economy).
Chinese patent CN106712064A proposes an economic configuration method for a battery energy storage system thermal power plant to participate in real-time deep peak shaving of a power grid, and the energy storage system is used for deep peak shaving of the thermal power plant to meet the requirement of power grid dispatching as far as possible. The patent protection content is different from the system structure and the working method of the patent which utilize various forms of energy storage to coordinate and optimize the operation of various power supply systems.
Chinese patent CN107492903A provides a capacity optimization configuration method of a hybrid energy storage system based on a statistical model, and the conservatism of the traditional deterministic algorithm can be improved by configuring the energy storage capacity of the wind-solar-energy storage combined power generation system by adopting the statistical method. The protection content of the patent is different from a configuration method of coordinating various power supply power generation working methods by various energy storage systems in the patent and performing optimal design by utilizing historical big data of power generation and transmission power operation.
Chinese patent CN106329579A proposes an optimal planning method for a wind, fire and electricity bundling power generation and transmission system based on direct current transmission, which can optimally plan the bundling of wind electricity and fire electricity. This patent protection is different from the method of coordinating the operation of multiple power sources using an energy storage system in this patent.
Chinese patent CN109378848A proposes an optimal configuration method for multiple types of battery energy storage systems, which can perform optimal capacity configuration and optimal operation scheme determination for different types of battery energy storage systems. The patent protection content is different from the configuration of cooperative operation of various energy storage forms in the patent and different from the working method of the energy storage system matched with various power supplies to optimize operation.
Chinese patent CN109193772A proposes an energy storage optimal configuration system and method based on a wind-solar micro-grid, and determines a wind-solar storage complementary configuration scheme according to load data aiming at an individual wind-solar micro-grid system. The protection content of the patent is different from the working method of the configuration of the diversified energy storage system and the diversified power supply in the patent for coordinating the safe and stable operation of the large clean energy base and the power grid.
Chinese patent CN104809531A proposes an energy storage system configuration method and system, which can utilize mixed integer linear programming and particle swarm optimization to calculate and optimize a scheduling objective function, so that the energy storage system is in an optimal scheduling state during operation. The protection content of the patent is different from the configuration and working method of the comprehensive energy storage body and the double operation mode of the comprehensive energy storage body and the power supply coordinated operation by synthesizing various energy storage technical forms, comprehensively considering technical and economic double standard parameters.
The energy base often includes multiple power forms, like wind-powered electricity generation, photovoltaic, clean thermoelectricity, water and electricity etc. because different power technology differences are great, the power collaborative operation degree of difficulty is very high in the energy base, and the total electric energy quality of base is difficult to guarantee, easily forms the impact to the electric wire netting, need be equipped with energy storage system, carries out the peak clipping to the electric energy and fills up the millet, and the energy fluctuation of energy base is stabilized, promotes electric energy quality, improves the electric wire netting friendship to improve the security and the economic nature of energy base.
The energy storage technologies are various in types, and different in technical maturity and characteristics, and it is necessary to select a corresponding and formed energy storage technology according to application scene requirements to perform system-level optimization design, and to provide a coordinated operation method of an energy storage system and each power supply of an energy base, so as to ensure clean, low-carbon, safe and efficient operation of the energy base, which is not mentioned in the existing patent achievements at present.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an energy storage system of an energy base and a working method thereof.
In order to achieve the purpose, the energy storage system of the energy base comprises a photovoltaic power generation system, a wind power generation system, a thermal power generation system, a hydraulic power generation system, an energy storage system, a thermal user, an electric network and a control system, wherein the wind power generation system, the thermal power generation system, the hydraulic power generation system and the energy storage system are all connected with the electric network through outgoing lines, the energy storage system is connected with the thermal user, and the control system is connected with the photovoltaic power generation system, the hydraulic power generation system, the thermal power generation system, the wind power generation system and the energy storage system.
The energy storage system comprises an energy type energy storage system and a power type energy storage system, wherein the energy type energy storage system comprises an electricity storage system and a heat storage system, the electricity storage system and the power type energy storage system are connected with an outgoing line, the heat storage system is connected with a heat user, and a control end of the power type energy storage system, a control end of the heat storage system and a control end of the electricity storage system are all connected with the control system.
The power type energy storage system is a direct current energy storage system.
The working method of the energy storage system of the energy base comprises the following steps:
1) predicting wind power resources and photovoltaic resources, dynamically predicting the output of a wind power generation system and the output of the photovoltaic power generation system in each future time period according to the predicted wind power resources, the predicted photovoltaic resources, the operating characteristics of the photovoltaic power generation system and the operating characteristics of the wind power generation system, and acquiring a load curve of a power grid in each future time period;
2) when the sum of the output of the wind power generation system and the output of the photovoltaic power generation system is smaller than the power scheduling load required by the power grid, determining the adjusting load of the current thermal power generation system and the current hydraulic power generation system, then determining the energy storage adjusting power according to the adjusting load of the current thermal power generation system and the current hydraulic power generation system, the power scheduling load required by the power grid, the corresponding adjusting time constant of the power grid and the adjusting difference value change curve in the time constant section, and feeding back the electric energy to an outgoing line by the energy storage system according to the energy storage adjusting power;
and when the sum of the output of the wind power generation system and the output of the photovoltaic power generation system is greater than or equal to the power scheduling load required by the power grid, calculating the average probability density of the abundant power, taking the average probability density as the power of the energy type energy storage system, and taking the power exceeding the average probability density and the power below the average probability density as the power of the power type energy storage system.
The method specifically comprises the following steps:
1) representing the output characteristics of different time scales of each power supply in an energy base
11) Wind power output depends on wind speed, output characteristics of different time scales in a typical year are calculated through a simulation method according to historical data, and the maximum value and the minimum value of the output of the wind power generation system and the occurrence time period of the output are determined;
Pwind＝Pwind(t) t∈(t0,tpre)
wherein, PwindTo be measured from the current time t0Starting, predicting a time point t in the futurepreThe wind power generation power of the inner wind power generation system changes;
12) the photovoltaic output depends on the irradiation condition, the output characteristics of different time scales in a typical year are calculated by a simulation method, and the maximum value, the minimum value and the occurrence time period of the output of the photovoltaic power generation system are determined;
Ppv＝Ppv(t) t∈(t0,tpre)
wherein, PpvTo be measured from the current time t0Starting, predicting a time point t in the futurepreThe photovoltaic power generation power of the inner photovoltaic power generation system 1 changes;
13) determining a load adjusting range of the thermal power generation system according to historical data, then determining that under different loads in the adjusting range, different loads are taken as adjusting targets, and calculating an adjusting time constant, a curve of the time variation of the thermal power load and a scheduling difference value in an adjusting time constant time period and a power variation range of the curve;
Tpower＝Tpower(lpower1,lpower2) lpower1,lpower2∈(Lpower1,Lpower2)
wherein the adjustment time constant is the minimum time required to adjust from one load to another, TpowerFor adjusting the time constant of a thermal power system under two loads,/power1And lpower2For regulating load of thermal power generation system, Lpower1And Lpower2The lower limit and the upper limit of the adjusting range of the thermal power generation system are set;
Twater＝Twater(lwater1,lwater2) lwater1,lwater2∈(Lwater1,Lwater2)
wherein, TwaterFor adjusting the time constant of a hydroelectric power system under two loads,/water1And lwater2For regulating the load of the hydroelectric power system, Lwater1And Lwater2The lower and upper limits of the regulation range for the hydro-power generation system.
Ppower＝Ppower(t) t∈(t0,Tpower)
Wherein, PpowerTo be measured from the current time t0Starting, adjusting the time constant by a time point TpowerThe thermal power of the internal thermal power generation system changes;
Pwater＝Pwater(t) t∈(t0,Twater)
wherein, PwaterTo be measured from the current time t0Starting, adjusting the time constant by a time point TwaterHydroelectric power changes in the internal hydro-power generation system;
2) obtaining a future predicted time tpreInternal required regulated output characteristic
When the sum of the outputs of the wind power generation system and the photovoltaic power generation system is smaller than the power dispatching load of the power grid, determining the adjusting time constant of the thermal power generation system and the hydraulic power generation system at each moment according to the output characteristics required to be adjusted and the difference value between the sum of the thermal power generation load and the hydraulic power generation load and the required dispatching load in the adjusting time constant time period, and determining the required adjusting power P of the energy storage system according to the difference valuees；
Pes＝Pgrid-Pwind-Ppv-Ppower-Pwater (Pgrid>Pwind+Ppv)
Wherein, PgridScheduling power for power needed by a power grid;
wherein, Pes-energyThe energy storage power of the energy type energy storage system;
when the sum of the output of the wind power generation system and the output of the photovoltaic power generation system is greater than or equal to the power dispatching load of the power grid, determining the future time tpreThe average probability density is used as the power of the energy storage system, the power exceeding the average probability density and the power below the average probability density are used as the power of the power storage system, and the theoretical power P required to be adjusted by the energy storage system is obtainedes-theoretical；
Pes-theoretical＝Pwind+Ppv-Pgrid+Ppower-base+Pwater-base
Wherein, Ppower-baseAnd Pwater-baseThe basic loads of the thermal power generation system and the hydroelectric power generation system are respectively;
power P required to be regulated by energy type energy storage systemes-energyComprises the following steps:
Pes-energy＝Pes-theoretical/(tpre-t0)(Pgrid>Pwind+Ppv)
power P required to be regulated by power type energy storage systemes-powerComprises the following steps:
the invention has the following beneficial effects:
when the energy storage system of the energy base and the working method thereof are operated specifically, when the sum of the output of the wind power generation system and the output of the photovoltaic power generation system is less than the power dispatching load required by the power grid, the energy storage regulating power is determined, and the energy storage system feeds back the electric energy to an outgoing line according to the energy storage regulating power; when the sum of the output of the wind power generation system and the output of the photovoltaic power generation system is greater than or equal to the power dispatching load required by the power grid, the average probability density of abundant electric energy is used as the power of the energy storage system, the power exceeding the average probability density and the power below the average probability density are used as the power of the energy storage system, the energy storage system and each power supply of the energy base are coordinated to operate, the electric energy of the energy base is subjected to peak clipping and valley filling, the electric energy fluctuation is suppressed, the electric energy quality is improved, the friendliness of the power grid is improved, the safety and the economy of the energy base are improved, and the clean, low-carbon, safe and efficient operation of the energy base is ensured.
Drawings
Fig. 1 is a schematic structural diagram of an energy storage system of an energy base.
Wherein, 1 is a photovoltaic power generation system, 2 is a wind power generation system, 3 is a thermal power generation system, 4 is a hydraulic power generation system, 5 is an energy storage system, 501 is an energy type energy storage system, 5011 is an electricity storage system, 5012 is a heat storage system, 502 is a power type energy storage system, 6 is a heat consumer, 7 is a power grid 7, 8 is a control system.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the energy storage system of the energy base of the invention comprises a photovoltaic power generation system 1, a wind power generation system 2, a thermal power generation system 3, a hydraulic power generation system 4, an energy storage system 5, a thermal user 6, an electric network 7 and a control system 8, wherein the wind power generation system 2, the thermal power generation system 3, the hydraulic power generation system 4 and the energy storage system 5 are all connected with the electric network 7 through an outgoing line, the energy storage system 5 is connected with the thermal user 6, and the control system 8 is connected with the photovoltaic power generation system 1, the hydraulic power generation system 4, the thermal power generation system 3, the wind power generation system 2 and the energy storage system 5.
The energy storage system 5 comprises an energy storage system 501 and a power storage system 502, wherein the energy storage system 501 comprises an electricity storage system 5011 and a heat storage system 5012, the electricity storage system 5011 and the power storage system 502 are connected with an outgoing line, the heat storage system 5012 is connected with a hot user 6, a control end of the power storage system 502, a control end of the heat storage system 5012 and a control end of the electricity storage system 5011 are connected with a control system 8, and the power storage system 502 is a direct current energy storage system.
The working method of the energy storage system of the energy base comprises the following steps:
1) predicting wind power resources and photovoltaic resources, dynamically predicting the output of the wind power generation system 2 and the output of the photovoltaic power generation system 1 in each time period in the future according to the predicted wind power resources, the predicted photovoltaic resources, the operating characteristics of the photovoltaic power generation system 1 and the operating characteristics of the wind power generation system 2, and simultaneously acquiring a load curve of a power grid 7 in each time period in the future;
2) when the sum of the output of the wind power generation system 2 and the output of the photovoltaic power generation system 1 is smaller than the power scheduling load required by the power grid 7, determining the adjusting load of the current thermal power generation system 3 and the current hydraulic power generation system 4, then determining the energy storage adjusting power according to the adjusting load of the current thermal power generation system 3 and the current hydraulic power generation system 4, the power scheduling load required by the power grid 7, the corresponding adjusting time constant of the power scheduling load and the adjusting difference change curve in the time constant section, and feeding back the electric energy to an outgoing line by the energy storage system 5 according to the energy storage adjusting power;
when the sum of the output of the wind power generation system 2 and the output of the photovoltaic power generation system 1 is greater than or equal to the power scheduling load required by the power grid 7, calculating the average probability density of the abundant power, taking the average probability density as the power of the energy-type energy storage system 501, and taking the power exceeding the average probability density and the power below the average probability density as the power of the power-type energy storage system 502.
The method specifically comprises the following steps:
1) representing the output characteristics of different time scales of each power supply in an energy base
11) Wind power output depends on wind speed, output characteristics of different time scales in a typical year are calculated through a simulation method according to historical data, and the maximum value and the minimum value of the output of the wind power generation system 2 and the occurrence time period of the output are determined;
Pwind＝Pwind(t) t∈(t0,tpre)
wherein, PwindTo be measured from the current time t0Starting, predicting a time point t in the futurepreThe wind power generation power of the inner wind power generation system 2 changes;
12) the photovoltaic output depends on the irradiation condition, the output characteristics of different time scales in a typical year are calculated by a simulation method, and the maximum value, the minimum value and the occurrence time period of the output of the photovoltaic power generation system 1 are determined;
Ppv＝Ppv(t) t∈(t0,tpre)
wherein, PpvTo be measured from the current time t0Starting, predicting a time point t in the futurepreThe photovoltaic power generation power of the inner photovoltaic power generation system 1 changes;
13) determining the load adjusting range of the thermal power generation system 3 according to historical data, then determining that different loads are used as adjusting targets under different loads in the adjusting range, and calculating an adjusting time constant, a curve of the time variation of the thermal power load and a scheduling difference value in an adjusting time constant time period and a power variation range of the curve;
Tpower＝Tpower(lpower1,lpower2) lpower1,lpower2∈(Lpower1,Lpower2)
wherein the adjustment time constant is the minimum time required to adjust from one load to another, TpowerFor adjusting the time constant of the thermal power generation system 3 under two loads,/power1And lpower2Is the regulation load of the thermal power generation system 3, Lpower1And Lpower2The lower limit and the upper limit of the adjustment range for the thermal power generation system 3;
Twater＝Twater(lwater1,lwater2) lwater1,lwater2∈(Lwater1,Lwater2)
wherein, TwaterFor adjusting the time constant of the hydroelectric power system 4 under two loads,/water1And lwater2For regulating the load of the hydroelectric power system 4, Lwater1And Lwater2The lower and upper limits of the range are adjusted for the hydro-power generation system 4.
Ppower＝Ppower(t) t∈(t0,Tpower)
Wherein, PpowerTo be measured from the current time t0Starting, adjusting the time constant by a time point TpowerThe thermal power of the internal thermal power generation system 3 changes;
Pwater＝Pwater(t) t∈(t0,Twater)
wherein, PwaterTo be measured from the current time t0Starting, adjusting the time constant by a time point TwaterThe hydroelectric power of the internal hydroelectric power generation system 4 changes;
2) obtaining a future predicted time tpreInternal required regulated output characteristic
When the sum of the outputs of the wind power generation system 2 and the photovoltaic power generation system 1 is smaller than the power dispatching load of the power grid, determining the adjusting time constant of the thermal power generation system 3 and the hydraulic power generation system 4 at each moment according to the output characteristics required to be adjusted and the difference value between the sum of the thermal power generation load and the hydraulic power generation load and the required dispatching load in the adjusting time constant time period, and determining the required adjusting power P of the energy storage system 5 according to the difference valuees；
Pes＝Pgrid-Pwind-Ppv-Ppower-Pwater (Pgrid>Pwind+Ppv)
Wherein, PgridScheduling power for the power required by the grid 7;
wherein, Pes-energyThe energy storage power of the energy type energy storage system 501;
when the sum of the output of the wind power generation system 2 and the output of the photovoltaic power generation system 1 is greater than or equal to the power dispatching load of the power grid 7, determining the future time tpreThe average probability density is used as the power of the energy storage system 501, the power exceeding the average probability density and the power below the average probability density are used as the power of the power storage system 502, and the theoretical power P required to be adjusted by the energy storage system 5 is obtainedes-theoretical；
Pes-theoretical＝Pwind+Ppv-Pgrid+Ppower-base+Pwater-base
Wherein, Ppower-baseAnd Pwater-baseThe base loads of the thermal power generation system 3 and the hydroelectric power generation system 4 are respectively;
the power P that the energy storage system 501 needs to regulatees-energyComprises the following steps:
Pes-energy＝Pes-theoretical/(tpre-t0) (Pgrid>Pwind+Ppv)
the power P of the power type energy storage system 502 needs to be adjustedes-powerComprises the following steps:
for the energy type energy storage system 501, if the stored electric energy is fed back to the energy base in the form of electric energy, the wind power and photovoltaic output needs to be taken into account, and if the stored electric energy is not fed back to the energy base in the form of electric energy, the wind power and photovoltaic output is not taken into account.
For the power-type energy storage system 502, the characteristic that the power-type energy storage system 502 is rapidly adjusted is exerted, and the power of the power-type energy storage system 502 is the larger value of the power exceeding the average probability density and the power below the average probability density.
For the electricity storage system 5011 which feeds back to the energy base in the form of electric energy, the electric energy is stored in the electricity storage system 5011 during energy storage, and the electric energy is fed back to an outgoing line from the electricity storage system 5011 during energy release; for the electricity storage system 5011 which does not feed back to the energy base in the form of electric energy, the electric energy is stored in the electricity storage system 5011 during energy storage, and the energy is transmitted from the electricity storage system 5011 to the energy user in the form of a certain energy during energy release, for example, the electric energy is stored in the heat storage system 5012 during energy storage in the heat storage system 5012 and the heat energy is transmitted to the heat user 6 during energy release.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (2)
1. The working method of the energy storage system of the energy base is characterized in that the energy storage system of the energy base comprises a photovoltaic power generation system (1), a wind power generation system (2), a thermal power generation system (3), a hydraulic power generation system (4), an energy storage system (5), a thermal user (6), a power grid (7) and a control system (8), wherein the wind power generation system (2), the thermal power generation system (3), the hydraulic power generation system (4) and the energy storage system (5) are connected with the power grid (7) through an outgoing line, the energy storage system (5) is connected with the thermal user (6), and the control system (8) is connected with the photovoltaic power generation system (1), the hydraulic power generation system (4), the thermal power generation system (3), the wind power generation system (2) and the energy storage system (5);
the energy storage system (5) comprises an energy type energy storage system (501) and a power type energy storage system (502), wherein the energy type energy storage system (501) comprises an electricity storage system (5011) and a heat storage system (5012), the electricity storage system (5011) and the power type energy storage system (502) are connected with an outgoing line, the heat storage system (5012) is connected with a heat user (6), and a control end of the power type energy storage system (502), a control end of the heat storage system (5012) and a control end of the electricity storage system (5011) are connected with a control system (8);
the method comprises the following steps:
1) forecasting wind power resources and photovoltaic resources, dynamically forecasting the output of the wind power generation system (2) and the output of the photovoltaic power generation system (1) in each future time period according to the forecasted wind power resources, photovoltaic resources, the operating characteristics of the photovoltaic power generation system (1) and the operating characteristics of the wind power generation system (2), and meanwhile acquiring a load curve of a power grid (7) in each future time period;
2) when the sum of the output of the wind power generation system (2) and the output of the photovoltaic power generation system (1) is smaller than the power scheduling load required by the power grid (7), determining the adjusting load of the current thermal power generation system (3) and the current hydraulic power generation system (4), then determining the energy storage adjusting power according to the adjusting load of the current thermal power generation system (3) and the current hydraulic power generation system (4), the power scheduling load required by the power grid (7), the corresponding adjusting time constant of the power grid (7) and the adjusting difference change curve in the time constant section, and feeding back the electric energy to an external transmission line by the energy storage system (5) according to the energy storage adjusting power;
when the sum of the output of the wind power generation system (2) and the output of the photovoltaic power generation system (1) is larger than or equal to the power scheduling load required by the power grid (7), calculating the average probability density of abundant power, taking the average probability density as the power of the energy type energy storage system (501), and taking the power exceeding the average probability density and the power below the average probability density as the power of the power type energy storage system (502);
the method specifically comprises the following steps:
1) representing the output characteristics of different time scales of each power supply in an energy base
11) The wind power output depends on the wind speed, the output characteristics of different time scales in a typical year are calculated by a simulation method according to historical data, and the maximum value and the minimum value of the output of the wind power generation system (2) and the occurrence time period of the maximum value and the minimum value are determined;
Pwind＝Pwind(t) t∈(t0,tpre)
wherein, PwindTo be measured from the current time t0Starting, predicting a time point t in the futurepreThe wind power generation power of the inner wind power generation system (2) changes;
12) the photovoltaic output depends on the irradiation condition, the output characteristics of different time scales in a typical year are calculated by a simulation method, and the maximum value, the minimum value and the occurrence time period of the output of the photovoltaic power generation system (1) are determined;
Ppv＝Ppv(t) t∈(t0,tpre)
wherein, PpvTo be measured from the current time t0Starting, predicting a time point t in the futurepreThe photovoltaic power generation power of the inner photovoltaic power generation system (1) changes;
13) determining a load adjusting range of the thermal power generation system (3) according to historical data, then determining that different loads are used as adjusting targets under different loads in the adjusting range, and calculating an adjusting time constant, a curve of the time variation of the thermal load and the scheduling difference value in an adjusting time constant time period along with the time and a power variation range of the curve;
Tpower＝Tpower(lpower1,lpower2) lpower1,lpower2∈(Lpower1,Lpower2)
wherein the adjustment time constant is the minimum time required to adjust from one load to another, TpowerFor adjusting the time constant of the thermal power system (3) under two loads,/power1And lpower2Is the regulation load of the thermal power generation system (3), Lpower1And Lpower2The lower limit and the upper limit of the adjusting range of the thermal power generation system (3);
Twater＝Twater(lwater1,lwater2) lwater1,lwater2∈(Lwater1,Lwater2)
wherein, TwaterFor adjusting the time constant of the hydroelectric power generation system (4) under two loads,/water1And lwater2For regulating the load of the hydroelectric power system (4), Lwater1And Lwater2Lower and upper limits of the regulation range for the hydro-power generation system (4);
Ppower＝Ppower(t) t∈(t0,Tpower)
wherein, PpowerTo be measured from the current time t0Starting, adjusting the time constant by a time point TpowerThe thermal power of the internal thermal power generation system (3) is changed;
Pwater＝Pwater(t) t∈(t0,Twater)
wherein, PwaterTo be measured from the current time t0Starting, adjusting the time constant by a time point TwaterThe hydroelectric power of the internal hydroelectric power generation system (4) is changed;
2) obtaining a future predicted time tpreInternal required regulated output characteristic
When the sum of the outputs of the wind power generation system (2) and the photovoltaic power generation system (1) is smaller than the power dispatching load of the power grid, determining the adjusting time constant of the thermal power generation system (3) and the hydraulic power generation system (4) at each moment according to the output characteristics required to be adjusted, and the difference value between the sum of the thermal power generation load and the hydraulic power generation load and the required dispatching load in the adjusting time constant time period, and determining the required adjusting power P of the energy storage system (5) according to the difference valuees；
Pes＝Pgrid-Pwind-Ppv-Ppower-Pwater(Pgrid>Pwind+Ppv)
Wherein, PgridScheduling power for the power required by the power grid (7);
wherein, Pes-energyThe energy storage power of the energy type energy storage system (501);
when the sum of the output of the wind power generation system (2) and the output of the photovoltaic power generation system (1) is greater than or equal to the power dispatching load of the power grid (7), determining the future time tpreThe surplus power in the energy storage system is analyzed, the surplus power change curve is analyzed, the surplus power is integrated according to time to obtain the average probability density of the surplus power, the average probability density is used as the power of the energy storage system (501), and the excess of the average probability density is usedThe power of the degree and the power below the average probability density are taken as the power of the power type energy storage system (502) to obtain the theoretical power P required to be adjusted by the energy storage system (5)es-theoretical；
Pes-theoretical＝Pwind+Ppv-Pgrid+Ppower-base+Pwater-base
Wherein, Ppower-baseAnd Pwater-baseThe basic loads of the thermal power generation system (3) and the hydroelectric power generation system (4) are respectively;
the power P of the energy storage system 501 needs to be adjustedes-energyComprises the following steps:
Pes-energy＝Pes-theoretical/(tpre-t0)(Pgrid≤ Pwind+Ppv)
power P of power type energy storage system (502) needing to be adjustedes-powerComprises the following steps:
2. the method of operating an energy base energy storage system according to claim 1, characterized in that the power type energy storage system (502) is a direct current energy storage system.
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