CN111525609A - Method for supplying power to thermal power plant by directly connecting wind and solar energy storage power supply to thermal power plant - Google Patents
Method for supplying power to thermal power plant by directly connecting wind and solar energy storage power supply to thermal power plant Download PDFInfo
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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
- H02J11/00—Circuit arrangements for providing service supply to auxiliaries of stations in which electric power is generated, distributed or converted
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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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- 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
- H02J3/381—Dispersed generators
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/20—Climate change mitigation technologies for sector-wide applications using renewable energy
Abstract
The invention discloses a method for supplying power to a thermal power plant by directly accessing a wind-solar energy storage power supply to the thermal power plant, which comprises the steps of establishing an overall operation scheduling strategy of the thermal power plant after accessing the wind-solar energy storage power supply; making a switching mechanism between scheduling strategies; setting an optimization method aiming at a scheduling strategy; a technical method suitable for building a wind-solar energy storage power supply-thermal power plant system is provided; an evaluation method for the technical method combination is set. The invention provides a scheduling control strategy and a technical transformation method suitable for a new environment based on a construction idea that a wind-solar energy storage power supply is directly connected to a thermal power plant through a special line, aims at the stable supply requirement of the thermal power plant on the service power, and is matched with the original operation mode of supplying the service power of the thermal power plant, so that the supply of the wind-solar energy storage power supply to the service power of the thermal power plant is realized. The local wind power and photoelectric consumption capability of wind power and photoelectric resource enrichment areas is effectively improved, and multi-energy complementation is fully realized.
Description
Technical Field
The invention relates to a method for directly accessing a wind and light power storage source to a thermal power plant to supply power to the thermal power plant, belonging to the field of multi-energy complementation of power systems.
Background
In order to solve the problem of wind abandoning and light abandoning in wind power and photoelectric resource enrichment areas, in recent years, a multi-energy complementary mode that a wind-light power storage source is directly connected to a thermal power plant to supply power to the thermal power plant is provided in the related technology, but a matching scheduling method of the thermal power plant after the wind-light power storage source is connected and the research on self transformation of the thermal power plant are lacked.
After the wind-solar energy storage power supply is directly connected to the thermal power plant through a special line, a scheduling control strategy in a new mode is provided by matching with the original operation mode of supplying the auxiliary power of the thermal power plant, so that the supply of the wind-solar energy storage power supply to the auxiliary power of the thermal power plant is realized. The local consumption capacity of wind power and photoelectric resources in wind power and photoelectric resource enrichment areas is effectively improved, and multi-energy complementation is fully realized. Meanwhile, aiming at the high reliability requirement of the power plant power of the thermal power plant, after the low-reliability wind and light storage power supply equipment is introduced, the invention provides a technical strategy for reconstruction and an evaluation method thereof, and ensures the reliable operation of the wind and light storage power supply after the access. The actual online electric quantity of the thermal power plant is effectively guaranteed, the self consumption of the thermal power plant is reduced, and a green low-carbon development call is responded.
Disclosure of Invention
The invention aims to solve the technical problem of making up the defects of the prior art and provides a method for directly connecting a wind and light power storage source into a thermal power plant to supply power to the thermal power plant.
In order to solve the technical problem, the invention provides a method for directly accessing a wind and light power storage source to a thermal power plant to supply power to the thermal power plant, which comprises the following steps:
establishing operation scheduling strategies of the thermal power plant after the wind-solar power storage power supply is accessed, and establishing a switching method among the scheduling strategies; setting an optimization method aiming at a scheduling strategy;
the technical method suitable for the construction of the wind-solar energy storage power supply-thermal power plant system is evaluated and determined.
Further, the operation scheduling strategy of the thermal power plant after the wind-solar power storage power supply is accessed comprises the following steps: an aggressive scheduling mode and a conservative scheduling mode; when the supply of the service power of the thermal power plant completely depends on the wind-solar power storage source, the aggressive scheduling mode is adopted, and when the supply of the service power of the thermal power plant by providing electric energy by the thermal power plant is adopted, the conservative scheduling mode is adopted.
Further, a method for switching between scheduling policies specifically includes:
when the wind-solar energy storage power supply supplies power for the thermal power plant, the system operates in an aggressive dispatching mode, and at the moment, if wind power is lower than Vcm/s or load power consumption exceeding WcIn the kilowatt-hour state, the system is switched from an aggressive scheduling mode to a conservative scheduling mode; when the system is in the wind below Vcm/s and the load power consumption exceeds WcIn kilowatt-hour state, the system keeps a conservative scheduling mode, and at the moment, if wind power exceeds Vcm/s or load power consumption less than WcIn the kilowatt-hour state, the system is still switched to a conservative scheduling mode; when the system is changed from other operation states to wind power exceeding Vcm/s and the load power consumption is less than WcWhen the kilowatt-hour state is operated, the system is correspondingly switched from a conservative scheduling mode to an aggressive scheduling mode; the threshold value of the predicted wind power is Vcm/s, limit value of load electricity consumption is WcKilowatt-hour.
Further, the method for setting and optimizing the scheduling policy specifically comprises the following steps:
in an aggressive scheduling mode, the power plant of the thermal power plant completely depends on energy storage, only the rotating reserve capacity of a wind-light energy storage power supply-thermal power plant system needs to be adjusted under abnormal conditions, the adjustment is not needed under a steady state, and optimization conditions with minimum wind power and minimum photoelectric power as targets are set:
in the formula, Pw(t) wind power, MW, for a period of t; pPV(t) photovoltaic power, MW, for a period of t; ph(t) is the power generation power, MW of the thermal power plant in the period t;
is the average value of wind power, MW;
the photovoltaic power average value is MW, β is a weight coefficient, β is 0-1, and T is a total time period.
Defining the comprehensive climbing rate as P(tsd)The system consists of wind power, photoelectricity and thermal power ramp rates:
P(tsd)＝αPw(tsd)+θPPV(tsd)+μPh(tsd)(1-2)
in the formula, Pw(tsd)Wind power climbing rate, MW/h; pPV(tsd)Is photoelectric climbing rate, MW/h, Ph(tsd)For the thermal power ramp rate, MW/h and α are weight coefficients, α is 0-1, theta is the weight coefficient, theta is 0-1, mu is the weight coefficient, mu is 0-1, α + theta + mu is 1.
Comprehensive climbing constraint conditions:
Pmin(tsd)＜P(tsd)＜Pmax(tsd)(1-3)
in the formula, Pmin(tsd)The maximum value of the comprehensive climbing rate is MW/h; pmax(tsd)The minimum value of the comprehensive climbing rate is MW/h;
power P of thermal power planthAnd (3) constraint:
Phmin≤Ph≤Phmax(1-4)
in the formula, PhminThe minimum value of active power output, MW, of the thermal power plant; phmaxThe maximum active power output value, MW, of the thermal power plant;
actual output P of wind powerwAnd the actual photoelectric output PPVAnd (3) constraint:
in the formula, PwminThe minimum value of the output power of the wind turbine generator is MW; pwrRated power, MW, of the fan; pPVminMinimum photovoltaic array output, MW; pPVrRated power, MW, of the photovoltaic array;
in a conservative scheduling mode, the power plant power depends on thermal power, and an optimization condition with the minimum power generation cost as a target function is set:
in the formula, f (P)h) Ten thousand yuan for the total power generation cost in the scheduling process; phThe output power is the output power of a generating set of a thermal power plant, MW; f (P)h) The fuel cost of the generator set is ten thousand yuan;
the active power balance constraint is:
in the formula, Pn,hThe output power of a generator set n of a thermal power plant, MW; n is 1,2, …, and N is the total number of generating sets of the power plant;
for the total load of the system, MW;
power P of thermal power planthAnd (3) constraint:
Phmin≤Ph≤Phmax(2-3)
in the formula (I), the compound is shown in the specification,Phminthe minimum value of active power output, MW, of the thermal power plant; phmaxThe maximum value of active power output, MW, of the thermal power plant.
Further, three technical methods suitable for building a wind-solar energy storage power supply-thermal power plant system are provided, which specifically comprise the following steps:
(1) thermal power reserve is added into a thermal power plant, a thermal power part is stored in a thermal power reserve mode, and under the condition that a wind-solar energy storage power supply is lost, the thermal power plant supplies power by self-generation of the thermal power plant, so that safe and stable operation is ensured;
(2) the energy storage equipment is arranged in sections, so that the reliable power supply of the wind and light energy storage power supply is ensured;
(3) and the standby alternate mechanism is used for respectively connecting the energy storage equipment to each section of bus after the wind-solar energy storage power supply is supplied, and switching to the rest sections to continue supplying power after the power supply of the daily working section reaches t hours.
Further, aiming at the technical method for adapting to the construction of the wind-solar energy storage power supply-thermal power plant system, according to different equipment categories, the time scale distribution of the partition and different engineering requirements is carried out, an evaluation method of comprehensive distribution partition is provided for evaluation, and a specific practicable technical method suitable for the transformation of the wind-solar energy storage power supply-thermal power plant system under different actual measurement environments is determined, and specifically comprises the following steps:
after the power electronic equipment, the electrical circuit equipment and the asynchronous motor equipment related to the three technical methods are distinguished, the three technical methods are divided into three independent evaluation ranges of the power electronic equipment, the electrical circuit equipment and the asynchronous motor equipment; dividing the layout into three independent evaluation ranges of short term, medium term and long term according to different overhaul period of the equipment in the three technical methods;
determining weight indexes corresponding to the three technical methods in different subareas and different overhaul period layout ranges respectively;
and (3) integrating the weight values of the three methods in different areas and layouts to determine a technical method suitable for concrete implementation of the wind, light and energy storage power supply-thermal power plant system.
The invention achieves the following beneficial effects: the wind power and the photoelectric energy are directly accessed to the thermal power plant after being stored for supplying power to the thermal power plant, a new way for wind power and photoelectric resource enrichment areas to consume the wind power and the photoelectric energy on site is created, the multi-energy complementary dynamic balance of a power system is realized, the problems of resource waste and environmental pollution are relieved, and a green low-carbon development call is responded. Meanwhile, the flexibility of each part of the power grid is mobilized, and the development of the power grid is promoted.
Drawings
FIG. 1 is a diagram of an overall strategy mode for operation scheduling of a thermal power plant after a wind-solar power storage power supply is connected in the invention;
fig. 2 is a diagram of the switching mechanism of the overall strategy of the operation scheduling of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
A method for supplying power to a thermal power plant by directly accessing a wind and light power storage source to the thermal power plant comprises the following steps:
1) establishing operation scheduling strategies of the thermal power plant after the wind-solar power storage power supply is accessed, and establishing a switching method among the scheduling strategies; setting an optimization method aiming at a scheduling strategy;
2) the technical method suitable for the construction of the wind-solar energy storage power supply-thermal power plant system is evaluated and determined.
Due to the material characteristics of the photovoltaic cell, the daily power generation curve of the photovoltaic cell is approximately similar to the daily load curve, so that an aggressive scheduling mode and a conservative scheduling mode are provided by matching the wind-solar power storage power supply equipment with the original operation scheduling mode of supplying the self auxiliary power of the thermal power plant according to the load power consumption and the wind power generation amount in the power supply area of the thermal power plant with the wind-solar power storage power supply. The scheduling policy is further explained in connection with fig. 1. When the load power consumption is in a low-ebb state and the wind power is large, the supply of the service power of the thermal power plant completely depends on the wind-light power storage source, the rotating standby capacity of the thermal power plant is sufficient, and even if the supply of the wind-light power storage source is in a problem, the stable supply of the service power of the thermal power plant cannot be influenced, so that the method can be called as an 'aggressive dispatching mode'. When the wind power is small or the load power consumption is in a peak state and the wind power is large, the thermal power plant provides electric energy to supply the plant power, so that the condition that the supply and the demand of the low wind power and the high load power consumption are unbalanced is avoided, the safe and stable operation of the plant power of the thermal power plant is fully ensured, and the method can be called as a conservative dispatching mode.
In the face of the stable power supply requirement of the thermal power plant, when the wind and light power storage power supply supplies power to the thermal power plant, the wind and light power storage power supply-thermal power plant system operates in an aggressive scheduling mode, and once abnormality occurs, the wind and light power storage power supply-thermal power plant system needs to be switched to a conservative scheduling mode. The switching of the two dispatching modes is determined by the power consumption of the load and the wind power value, the switching standard between the dispatching strategies is established according to the standard guideline of the power industry, and the threshold value of the predicted wind power is Vcm/s, limit value of load electricity consumption is WcKilowatt-hour, the scheduling policy is further explained in conjunction with fig. 2. When the wind-solar energy storage power supply supplies power for the thermal power plant, the system operates in an aggressive dispatching mode, and at the moment, if wind power is lower than Vcm/s or load power consumption exceeding WcIn kilowatt-hour state, the system is switched from an aggressive scheduling mode to a conservative scheduling mode, as shown by arrows (1) and (2) in fig. 2; when the system is in the wind below Vcm/s and the load power consumption exceeds WcIn kilowatt-hour state, the system keeps a conservative scheduling mode, and at the moment, if wind power exceeds Vcm/s or load power consumption less than WcIn kilowatt-hour, the system still switches to conservative scheduling, as shown by arrows (3) and (4) in fig. 2; because the wind power fluctuates frequently, when the system is changed from other operation states to wind power exceeding Vcm/s and the load power consumption is less than WcWhen the system is operated in kilowatt-hour state, the system is correspondingly switched from the conservative scheduling mode to the aggressive scheduling mode, as shown by an arrow (5) in fig. 2, so that the function of the established scheduling mode switching mechanism is realized.
And aiming at the two scheduling strategies and the scheduling method switching mode adapting to the actual environment, setting optimization methods of the two scheduling methods. Wind power and photoelectricity are greatly influenced by weather, wind power is greatly changed suddenly within a short time interval, and the wind power and the photoelectricity are similar to each other. In order to ensure that the climbing event does not influence the supply of the wind-solar energy storage power supply to the auxiliary power of the thermal power plant, the wind-solar energy storage power supply is set as the constraint condition in the optimization method. The method is different from the self-climbing rate of the thermal power generating unit in the traditional mode, wind power and photoelectric climbing events are added, the wind power and photoelectric climbing events are combined with the original climbing event of the thermal power generating unit, and the comprehensive climbing rate is obtained by considering the switching mode of the scheduling mode. Different from the conventional method for establishing optimization in all-day time, the scheduling strategy provided by the invention has a switching state, so that the optimization method aiming at the scheduling strategy is segmented.
Under an aggressive scheduling mode, boiler parameter matching is not needed to be considered, power utilization of a thermal power plant completely depends on energy storage, only the rotating standby capacity of a wind-light energy storage power supply-thermal power plant system needs to be adjusted under an abnormal condition, and the adjustment is not needed under a steady state. In the mode, the wind power and the irradiation are required to be strong and the fluctuation of the wind power and the photoelectric power is small when the mode is operated in a steady state as much as possible, so that the optimization condition with the minimum wind power and the minimum photoelectric power as a target is set:
in the formula, Pw(t) wind power, MW, for a period of t; pPV(t) photovoltaic power, MW, for a period of t; ph(t) is the power generation power, MW of the thermal power plant in the period t;
is the average value of wind power, MW;
the average value of the photovoltaic power is MW, β is a weight coefficient, β is 0-1, and T is the total time period.
Defining the comprehensive climbing rate as P(tsd)The device consists of wind power, photoelectric and thermal power ramp rates.
P(tsd)＝αPw(tsd)+θPPV(tsd)+μPh(tsd)(1-2)
In the formula, Pw(tsd)For wind power climbingRate, MW/h; pPV(tsd)Is photoelectric climbing rate, MW/h, Ph(tsd)The method is characterized in that the gradient rate of the thermal power plant is MW/h, α is a weight coefficient, α is 0-1, theta is a weight coefficient, theta is 0-1, mu is a weight coefficient, mu is 0-1, α + theta + mu is 1, and the weight coefficient is set according to the irradiation and wind power conditions on the same day of operation and the proportion of the thermal power plant in a new mode.
Comprehensive climbing constraint conditions:
Pmin(tsd)＜P(tsd)＜Pmax(tsd)(1-3)
in the formula, Pmin(tsd)The maximum value of the comprehensive climbing rate is MW/h; pmax(tsd)The minimum value of the comprehensive climbing rate is MW/h.
Power P of thermal power planthAnd (3) constraint:
Phmin≤Ph≤Phmax(1-4)
in the formula, PhminThe minimum value of active power output, MW, of the thermal power plant; phmaxThe maximum value of active power output, MW, of the thermal power plant.
Actual output P of wind powerwAnd the actual photoelectric output PPVAnd (3) constraint:
Pwmin≤Pw≤Pwr
PPVmin≤PPV≤PPVr(1-5)
in the formula, PwminThe minimum value of the output power of the wind turbine generator is MW; pwrRated power, MW, of the fan; pPVminMinimum photovoltaic array output, MW; pPVrRated power, MW, of the photovoltaic array.
On the contrary, under the conservation scheduling mode, the power plant of the thermal power plant depends on the thermal power, higher parameters are kept in the boiler, at the moment, although the thermal efficiency of the thermal power plant is reduced, the wind-solar energy storage power supply can be stored for an aggressive scheduling mode, and therefore the optimization condition taking the minimum power generation cost as a target function is set:
in the formula, f (P)h) Ten thousand yuan for the total power generation cost in the scheduling process; phThe output power is the output power of a generating set of a thermal power plant, MW; f (P)h) The fuel cost of the generator set is ten thousand yuan.
The active power balance constraint is:
in the formula, Pn,hThe output power of a generator set n of a thermal power plant, MW; n is 1,2, …, and N is the total number of generating sets of the power plant;
the total load of the system, MW.
Power P of thermal power planthAnd (3) constraint:
Phmin≤Ph≤Phmax(2-3)
in the formula, PhminThe minimum value of active power output, MW, of the thermal power plant; phmaxThe maximum value of active power output, MW, of the thermal power plant.
In the original mode of the thermal power plant, in order to guarantee high-reliability power supply of station service power, the thermal power plant is provided with a segmented power supply guarantee redundancy, a standby segment and a security power supply to prevent abnormal conditions, however, the method is not suitable for accessing of the wind-solar energy storage power supply. The wind-solar energy storage power supply equipment is greatly influenced by external factors, so that the wind-solar energy storage power supply equipment has low reliability and volatility. Aiming at the high reliability requirement of the service power of the thermal power plant, the wind and light power storage power supply is introduced into the thermal power plant, and a technical method for improving and constructing a wind and light power storage power supply-thermal power plant system is required. (1) Thermal power reserves are added to thermal power plants. The thermal power part is stored in a thermal power storage mode, the operation efficiency of the thermal power plant can be reduced, the operation cost is increased, the reliability of daily operation can be guaranteed, and under the condition that the wind and light storage power supply is lost, the thermal power plant can supply power for the thermal power plant by means of self-generation of the thermal power plant, so that safe and stable operation is guaranteed. (2) The energy storage device is arranged in sections. The energy storage realizes the supply of the service power and can smooth the fluctuation of wind power and photoelectricity. The segmented arrangement can cause the efficiency to be reduced, but the reliable power supply of the wind and light storage power supply is ensured. (3) A backup rotation mechanism. The conventional power plant is provided with sectional wiring to ensure reliable and stable power supply of service power. After t hours of continuous operation of the energy storage device, the reliability may decrease. Therefore, by using the method, after the wind-solar energy storage power supply is adopted, in order to ensure high-reliability and stable power supply, the energy storage equipment is respectively connected to each section of bus, and when the power supply of the daily working section reaches t hours, the power supply is switched to the rest sections to continue power supply, namely, the power supply of different sections is switched every time the power supply reaches t hours.
Because the three technical methods provided by the above methods are not of the same type and have obvious space-time characteristic differences, if the technical methods are directly evaluated, the technical methods have great difficulty because comprehensive weight indexes cannot be obtained. Different from the traditional evaluation method, the invention provides an evaluation method of comprehensive distribution subareas for evaluation based on the technical method combination which has larger unit characteristic difference and is suitable for the construction of the wind-solar energy storage power supply-thermal power plant system, carries out subareas and time scale distribution with different engineering requirements according to different equipment types, determines a specific practicable technical method suitable for the reconstruction of the wind-solar energy storage power supply-thermal power plant system under different actual measurement environments, and specifically comprises the following steps: firstly, dividing power electronic equipment, electric line equipment and asynchronous motor equipment related to three technical methods into three independent evaluation ranges of the power electronic equipment, the electric line equipment and the asynchronous motor equipment after distinguishing; and dividing the layout into three independent evaluation ranges of short term, medium term and long term according to different overhaul periods of the equipment in the three technical methods. Secondly, weight indexes corresponding to the three technical methods are provided in different subareas and different overhaul period layout ranges respectively, and the specific weight values are determined by referring to the existing analytic hierarchy process in mathematics. And finally, combining the weight values of the three methods in different areas and layouts to determine a technical method suitable for the concrete implementation of the wind-solar energy storage power supply-thermal power plant system.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A method for directly accessing a wind and light power storage source to a thermal power plant to supply power to the thermal power plant is characterized by comprising the following steps:
establishing operation scheduling strategies of the thermal power plant after the wind-solar power storage power supply is accessed, and establishing a switching method among the scheduling strategies; setting an optimization method aiming at a scheduling strategy;
the technical method suitable for the reconstruction and implementation of the wind-solar energy storage power supply-thermal power plant system is determined by evaluating the technical method suitable for the construction of the wind-solar energy storage power supply-thermal power plant system.
2. The method for supplying power to the thermal power plant by directly accessing the wind-solar energy storage power supply to the thermal power plant according to claim 1, wherein the operation scheduling strategy of the thermal power plant after accessing the wind-solar energy storage power supply comprises: an aggressive scheduling mode and a conservative scheduling mode; when the supply of the service power of the thermal power plant completely depends on the wind-solar power storage source, the aggressive scheduling mode is adopted, and when the supply of the service power of the thermal power plant by providing electric energy by the thermal power plant is adopted, the conservative scheduling mode is adopted.
3. The method for supplying the power plant of the thermal power plant with the wind-solar energy storage power supply directly connected to the thermal power plant according to claim 2 is characterized in that a switching method among scheduling strategies specifically comprises the following steps:
when the wind-solar energy storage power supply supplies power for the thermal power plant, the system operates in an aggressive dispatching mode, and at the moment, if wind power is lower than Vcm/s or load power consumption exceeding WcIn the kilowatt-hour state, the system is switched from an aggressive scheduling mode to a conservative scheduling mode; when the system is in the wind below Vcm/s and the load power consumption exceeds WcIn kilowatt-hour state, the system keeps a conservative scheduling mode, and at the moment, if wind power exceeds Vcm/s or load power consumption less than WcIn the kilowatt-hour state, the system is still switched to a conservative scheduling mode; when the system is changed from other operation states to wind power exceeding Vcm/s and the load power consumption is less than WcKilowatt-hour shapeThe system is switched from a conservative scheduling mode to an aggressive scheduling mode correspondingly in the mode of dynamic operation; the threshold value of the predicted wind power is Vcm/s, limit value of load electricity consumption is WcKilowatt-hour.
4. The method for supplying the power plant of the thermal power plant with the wind-solar energy storage power supply directly connected to the thermal power plant according to claim 2 is characterized in that an optimization method is set aiming at a scheduling strategy, and specifically comprises the following steps:
in an aggressive scheduling mode, the power plant of the thermal power plant completely depends on energy storage, only the rotating reserve capacity of a wind-light energy storage power supply-thermal power plant system needs to be adjusted under abnormal conditions, the adjustment is not needed under a steady state, and optimization conditions with minimum wind power and minimum photoelectric power as targets are set:
in the formula, Pw(t) wind power, MW, for a period of t; pPV(t) photovoltaic power, MW, for a period of t; ph(t) is the power generation power, MW of the thermal power plant in the period t;
is the average value of wind power, MW;
the average value of photovoltaic power is MW, β is a weight coefficient, β is 0-1, and T is a total time period;
defining the comprehensive climbing rate as P(tsd)The system consists of wind power, photoelectricity and thermal power ramp rates:
P(tsd)＝αPw(tsd)+θPPV(tsd)+μPh(tsd)(1-2)
in the formula, Pw(tsd)Wind power climbing rate, MW/h; pPV(tsd)Is photoelectric climbing rate, MW/h, Ph(tsd)For the thermal power ramp rate, MW/h and α are weight coefficients, α is 0-1, theta is the weight coefficient, theta is 0-1, mu is the weight coefficient, mu is 0-1, α + theta + mu is 1;
comprehensive climbing constraint conditions:
Pmin(tsd)＜P(tsd)＜Pmax(tsd)(1-3)
in the formula, Pmin(tsd)The maximum value of the comprehensive climbing rate is MW/h; pmax(tsd)The minimum value of the comprehensive climbing rate is MW/h;
power P of thermal power planthAnd (3) constraint:
Phmin≤Ph≤Phmax(1-4)
in the formula, PhminThe minimum value of active power output, MW, of the thermal power plant; phmaxThe maximum active power output value, MW, of the thermal power plant;
actual output P of wind powerwAnd the actual photoelectric output PPVAnd (3) constraint:
in the formula, PwminThe minimum value of the output power of the wind turbine generator is MW; pwrRated power, MW, of the fan; pPVminMinimum photovoltaic array output, MW; pPVrRated power, MW, of the photovoltaic array;
in a conservative scheduling mode, the power plant power depends on thermal power, and an optimization condition with the minimum power generation cost as a target function is set:
in the formula, f (P)h) Ten thousand yuan for the total power generation cost in the scheduling process; phThe output power is the output power of a generating set of a thermal power plant, MW; f (P)h) The fuel cost of the generator set is ten thousand yuan;
the active power balance constraint is:
in the formula, Pn,hIs a fireThe output power of the power plant generator set n, MW; n is 1,2, …, and N is the total number of generating sets of the power plant;
for the total load of the system, MW;
power P of thermal power planthAnd (3) constraint:
Phmin≤Ph≤Phmax(2-3)
in the formula, PhminThe minimum value of active power output, MW, of the thermal power plant; phmaxThe maximum value of active power output, MW, of the thermal power plant.
5. The method for supplying power to the thermal power plant by directly connecting the wind-solar energy storage power supply to the thermal power plant according to claim 1 is characterized by providing three technical methods suitable for building a wind-solar energy storage power supply-thermal power plant system, and specifically comprises the following steps:
(1) thermal power reserve is added into a thermal power plant, a thermal power part is stored in a thermal power reserve mode, and under the condition that a wind-solar energy storage power supply is lost, the thermal power plant supplies power by self-generation of the thermal power plant, so that safe and stable operation is ensured;
(2) the energy storage equipment is arranged in sections, so that the reliable power supply of the wind and light energy storage power supply is ensured;
(3) and the standby alternate mechanism is used for respectively connecting the energy storage equipment to each section of bus after the wind-solar energy storage power supply is supplied, and switching to the rest sections to continue supplying power after the power supply of the daily working section reaches t hours.
6. The method for supplying power to a thermal power plant by directly accessing a wind-solar energy storage power supply to the thermal power plant according to claim 5, wherein for the technical method adapted to the construction of the wind-solar energy storage power supply-thermal power plant system, the time scale distribution of the subareas and different engineering requirements is performed according to different equipment categories, an evaluation method of comprehensive distribution subareas is provided for evaluation, and a specific implementable technical method suitable for the transformation of the wind-solar energy storage power supply-thermal power plant system under different actual measurement environments is determined, and specifically:
after the power electronic equipment, the electrical circuit equipment and the asynchronous motor equipment related to the three technical methods are distinguished, the three technical methods are divided into three independent evaluation ranges of the power electronic equipment, the electrical circuit equipment and the asynchronous motor equipment; dividing the layout into three independent evaluation ranges of short term, medium term and long term according to different overhaul period of the equipment in the three technical methods;
determining weight indexes corresponding to the three technical methods in different subareas and different overhaul period layout ranges respectively;
and (3) integrating the weight values of the three methods in different areas and layouts to determine a technical method suitable for concrete implementation of the wind, light and energy storage power supply-thermal power plant system.
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