CN113098071A - Method and device for establishing operation model of wind power photovoltaic system - Google Patents

Method and device for establishing operation model of wind power photovoltaic system Download PDF

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CN113098071A
CN113098071A CN202110286929.5A CN202110286929A CN113098071A CN 113098071 A CN113098071 A CN 113098071A CN 202110286929 A CN202110286929 A CN 202110286929A CN 113098071 A CN113098071 A CN 113098071A
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cogeneration unit
photovoltaic system
wind power
output
operation model
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CN113098071B (en
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陈新宇
金天昱
陈霞
文劲宇
聂志聪
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Huazhong University of Science and Technology
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D17/00—Monitoring or testing of wind motors, e.g. diagnostics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
    • F03D9/007—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations the wind motor being combined with means for converting solar radiation into useful energy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
    • F03D9/10—Combinations of wind motors with apparatus storing energy
    • F03D9/18—Combinations of wind motors with apparatus storing energy storing heat
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • 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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2113/00—Details relating to the application field
    • G06F2113/06—Wind turbines or wind farms
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
    • 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
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • 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
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    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction
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    • 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
    • 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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Abstract

The invention discloses a method and a device for establishing a wind power photovoltaic system operation model, belonging to the field of electrical engineering, wherein the method comprises the following steps: s1: analyzing a feasible region of the cogeneration unit to obtain the reserve capacity of the cogeneration unit; s2: the heat storage device is used for carrying out heat supply compensation to adjust the current thermal output of the cogeneration unit; s3: when the current power output of the cogeneration unit is fixed, analyzing the mapping relation between the current thermal output and the standby capacity of the cogeneration unit to establish a wind power photovoltaic system operation model. According to the method, the standby capacity expression which can be provided by the cogeneration unit is deduced based on the feasible region of the cogeneration unit, the thermal output of the unit is changed by means of heat supply compensation of the heat storage device, and then the wind power photovoltaic system operation model considering the cooperation of the heat storage device is obtained. The invention can improve the spare capacity value and the operation flexibility of the cogeneration unit and the capacity of the system for absorbing wind power and photovoltaic power.

Description

Method and device for establishing operation model of wind power photovoltaic system
Technical Field
The invention belongs to the field of electrical engineering, and particularly relates to a method and a device for establishing an operation model of a wind power photovoltaic system.
Background
In recent years, renewable energy sources mainly comprising wind power and photovoltaic power are vigorously developed in China, and great progress is made. By the end of 2019, the installed capacities of wind power and photovoltaic power in China exceed 200GW, but the problems of wind abandonment and light abandonment are still serious. Wind-powered electricity generation photovoltaic system includes: cogeneration units and heat storage devices. The cogeneration units can simultaneously generate heat energy and electric energy, each unit averagely works for 120 to 210 days every year and occupies an important position in cold regions, but the operation flexibility is poor due to the operation mode of 'fixing power by heat', and most of the phenomena of wind and light abandonment of the system are caused by the cogeneration units.
The poor operation flexibility of the existing wind power photovoltaic system also causes that the cogeneration unit hardly participates in the auxiliary service market to provide frequency modulation, reserve capacity and other services, and the operation benefit is lost.
Therefore, in order to improve the operation mode of the cogeneration unit for fixing the power by heat, improve the capacity of the system for absorbing wind power and photovoltaic power, and improve the participation degree of the auxiliary service market of the cogeneration unit, it is urgently needed to establish a wind power photovoltaic system operation model to improve the operation flexibility.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a method and a device for establishing a running model of a wind power photovoltaic system, and aims to solve the technical problems that a cogeneration unit is difficult to participate in an auxiliary service market due to a limited running mode of 'fixing power with heat', a wind power photovoltaic system generates a large amount of abandoned wind and abandoned light, and the running flexibility of the system is poor.
In order to achieve the above object, according to an aspect of the present invention, there is provided a method for establishing an operation model of a wind power photovoltaic system, including:
s1: analyzing a feasible region of a cogeneration unit to obtain the reserve capacity of the cogeneration unit;
s2: adjusting the current thermal output of the cogeneration unit by heat supply compensation through a heat storage device;
s3: when the current power output of the cogeneration unit is fixed, analyzing the mapping relation between the current thermal output of the cogeneration unit and the reserve capacity to establish the wind power photovoltaic system operation model.
In one embodiment, the feasible region includes four boundaries: AB. BC, CD and DA; AB represents the maximum power output limit, BC represents the maximum coal consumption limit, CD represents the maximum heating ratio limit, and DA represents the minimum steam consumption limit;
wherein the slope of AB is negative identifying a maximum power output boost of the cogeneration unit when the current thermal output of the cogeneration unit decreases.
In one embodiment, the S1 includes:
using the boundary AB expression of the feasible region and the minimum heat output of the cogeneration unit
Figure BDA0002980853150000021
Calculating a maximum power output of the cogeneration unit
Figure BDA0002980853150000022
And
Figure BDA0002980853150000023
are two constants in the boundary AB expression;
outputting the maximum power
Figure BDA0002980853150000024
And the current power output
Figure BDA0002980853150000025
Is used as the reserve capacity rs of the cogeneration unitt，
Figure BDA0002980853150000026
In one embodiment, the S2 includes:
when the total heat demand is fixed and a heat balance equation is satisfied, obtaining a corresponding relation between the heat output reduction of the cogeneration unit and the heat supply compensation of the heat storage device;
and utilizing the heat storage device to perform heat supply compensation based on the corresponding relation so as to adjust the current thermal output of the cogeneration unit.
In one embodiment, the thermodynamic equilibrium equation is
Figure BDA0002980853150000027
Figure BDA0002980853150000028
And
Figure BDA0002980853150000031
representing a maximum thermal output of the energy storage device and a current thermal output of the energy storage device, respectively;
Figure BDA0002980853150000032
for a minimum thermal output of the cogeneration unit,
Figure BDA0002980853150000033
is the current thermal output of the cogeneration unit.
In one embodiment, the S3 includes:
analyzing to obtain the maximum power output when the current power output of the cogeneration unit remains fixed
Figure BDA0002980853150000034
Increase and the spare capacity rstThe increment is the same;
according to
Figure BDA0002980853150000035
And
Figure BDA0002980853150000036
deducing the current thermal output of the cogeneration unit
Figure BDA0002980853150000037
And the reserve capacity rstAnd obtaining the wind power photovoltaic system operation model through the mapping relation between the wind power photovoltaic system and the photovoltaic system.
According to another aspect of the present invention, there is provided an apparatus for establishing an operation model of a wind power photovoltaic system, including:
the acquisition module is used for analyzing the feasible region of the cogeneration unit to acquire the reserve capacity of the cogeneration unit;
the adjusting module is used for adjusting the current thermal output of the cogeneration unit by performing heat supply compensation through the heat storage device;
and the establishing module is used for analyzing the mapping relation between the current thermal output of the cogeneration unit and the reserve capacity to establish the wind power photovoltaic system operation model when the current power output of the cogeneration unit is fixed.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
the invention discloses a method and a device for establishing a wind power photovoltaic system operation model. The invention improves the size of the available reserve capacity of the cogeneration unit, is beneficial to participating in the auxiliary service market, is beneficial to the system to absorb wind power and photovoltaic power, and improves the operation flexibility of the system.
Drawings
Fig. 1 is a flowchart of a method for establishing an operation model of a wind power photovoltaic system according to an embodiment of the present invention;
FIG. 2a is a schematic diagram of a feasible domain of a cogeneration unit provided by an embodiment of the present invention;
fig. 2b is a schematic diagram of the adjustment of the operating point of the cogeneration unit to provide the reserve capacity according to an embodiment of the present invention;
fig. 3 is a graph comparing backup capacity provided by a cogeneration unit under a traditional wind power photovoltaic system operation model and backup capacity provided by a wind power photovoltaic system operation model according to an embodiment of the present invention;
FIG. 4 is a graph comparing the amount of curtailment of wind and light in a system according to an embodiment of the present invention;
fig. 5 is an internal structural diagram of an apparatus for establishing an operation model of a wind power photovoltaic system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention provides a method for establishing a wind power photovoltaic system operation model, which comprises the following steps of: s1: analyzing a feasible region of the cogeneration unit to obtain the reserve capacity of the cogeneration unit; s2: the heat storage device is used for carrying out heat supply compensation to adjust the current thermal output of the cogeneration unit; s3: when the current power output of the cogeneration unit is fixed, analyzing the mapping relation between the current thermal output and the standby capacity of the cogeneration unit to establish a wind power photovoltaic system operation model.
Specifically, the wind power photovoltaic system comprises a cogeneration unit and a heat storage device, and by analyzing the feasible region of the cogeneration unit, the slope of the boundary AB can be found to be negative, so that it can be thought that by reducing part of the heat supply amount of the cogeneration unit, more power output can be improved, the difference between the maximum available power output and the currently running power output is the spare capacity available for the cogeneration unit, and the heat compensation part is provided by the heat storage device, so that the mapping relationship between the current thermal output and the spare capacity of the cogeneration unit is obtained by analysis, and an operation model of the wind power photovoltaic system is established.
In one embodiment, the feasible region includes four boundaries: AB. BC, CD and DA; AB represents the maximum power output limit, BC represents the maximum coal consumption limit, CD represents the maximum heating ratio limit, and DA represents the minimum steam consumption limit; wherein the slope of AB is negative, identifying a maximum power output boost of the cogeneration unit when the current thermal output of the cogeneration unit decreases.
In particular, a feasible domain of a cogeneration unit is shown in fig. 2 a. The feasible region consists of four boundaries, AB, BC, CD and DA, respectively, where AB represents the maximum power output limit, BC represents the maximum coal consumption limit, CD represents the maximum heat supply ratio limit, and DA represents the minimum steam consumption limit.
Because of the limitation of the operation mode of 'using heat to fix electricity', the movable range of the operation point of the cogeneration unit is only a line segment which passes through the actual operation point, is vertical to the Q axis and is limited by the upper boundary and the lower boundary, and because the operation point of the unit is often positioned near the upper boundary in the actual operation process, the available spare capacity is very small or even can be ignored.
In one embodiment, S1 includes: minimum heat output of cogeneration unit using boundary AB expression of feasible region
Figure BDA0002980853150000051
Calculating maximum power output of cogeneration unit
Figure BDA0002980853150000052
Figure BDA0002980853150000053
Figure BDA0002980853150000054
And
Figure BDA0002980853150000055
are two constants in the boundary AB expression; outputting the maximum power
Figure BDA0002980853150000056
And the current power output
Figure BDA0002980853150000057
The difference value of (a) is used as the reserve capacity rs of the cogeneration unitt，
Figure BDA0002980853150000058
Specifically, fig. 2b shows the movement of the operating point of the cogeneration unit in cooperation with the heat storage device and the corresponding amount of available reserve capacity. Wherein:
Figure BDA0002980853150000059
the actual power output at time t for the ith cogeneration unit,
Figure BDA00029808531500000510
the maximum available power output for the ith cogeneration unit at time t.
Assuming that the line segment AB in fig. 2b is known to have a definite linear expression, at time t in the ith cogeneration unit,
Figure BDA0002980853150000061
the thermal output to be provided by the minimum
Figure BDA0002980853150000062
It was decided that they will satisfy the following expression:
Figure BDA0002980853150000063
in the formula:
Figure BDA0002980853150000064
and
Figure BDA0002980853150000065
is two constants in the expression of the line segment AB, and is determined by the feasible domain shape of the cogeneration unit itself.
When a cogeneration unit reduces its thermal output, it can provide more electrical output as the backup capacity it can provide.
As shown in fig. 2b, the dotted line segment is the spare capacity that can be provided by the cogeneration unit without modifying the model, and the solid line segment is the spare capacity that can be provided additionally when the model is modified. Under the condition that the operating point of the unit is generally at the upper boundary during operation, the length of the broken line segment is short, and the available spare capacity is small, so that the extra available spare capacity represented by the solid line segment is particularly important.
Assuming that the thermal demand is given at time t and sufficient thermal power is still stored in the heat storage device, the available reserve capacity of the cogeneration unit and the heat storage device can be expressed as:
Figure BDA0002980853150000066
in the formula: rstIndicating the amount of spare capacity that the cogeneration unit can provide at time t.
In one embodiment, S2 includes: when the total heat demand is fixed and the heat balance equation is satisfied, obtaining the corresponding relation between the heat output reduction of the cogeneration unit and the heat supply compensation of the heat storage device; and performing heat supply compensation by using the heat storage device based on the corresponding relation so as to adjust the current thermal output of the cogeneration unit.
In one embodiment, the thermodynamic equilibrium equation is
Figure BDA0002980853150000067
Figure BDA0002980853150000068
And
Figure BDA0002980853150000069
respectively representing the maximum thermal output of the energy storage device and the current thermal output of the energy storage device;
Figure BDA00029808531500000610
for the minimum heat output of the cogeneration unit,
Figure BDA00029808531500000611
is the current heat output of the cogeneration unit.
In particular, considering that the total thermal demand of the region is fixed, the following thermal equilibrium equation
Figure BDA00029808531500000612
Will have to be satisfied. In the formula:
Figure BDA00029808531500000613
and
Figure BDA00029808531500000614
representing the maximum available thermal output and the current thermal output of the thermal storage unit at time t, respectively.
In one embodiment, S3 includes: when the current power output of the cogeneration unit is kept fixed, analyzing to obtain the maximum power output
Figure BDA00029808531500000615
Increase and spare capacity rstThe increment is the same; according to
Figure BDA0002980853150000071
And
Figure BDA0002980853150000072
deducing the current thermal output of the cogeneration unit
Figure BDA0002980853150000073
And spare capacity rstAnd obtaining the operation model of the wind power photovoltaic system through the mapping relation between the wind power photovoltaic system and the photovoltaic system.
In order to verify the establishment method of the wind power photovoltaic system operation model provided by the invention, the following examples are listed for explanation:
based on the IEEE-6 node wind power photovoltaic system, example analysis is carried out, and the wind power and photovoltaic capacities of the wind power photovoltaic system before and after the standby capacity model of the cogeneration unit is improved are compared.
6 traditional thermal power generating units (G) are included in node wind power photovoltaic system1、G2And G3) Two cogeneration units (CHP)1And CHP2) A wind farm (W)1) And a photovoltaic electric field (PV)1). The power demand of the wind power photovoltaic system is set to be evenly distributed by the nodes 3 and the nodes 6, and two heat supply areas in the wind power photovoltaic system are respectively arranged behind the nodes 3 (the heat supply area 1) and the nodes 6 (the heat supply area 2). The combined heat and power generation unit 1 is used for independently supplying heat to the region 1, the combined heat and power generation unit 2 is used for independently supplying heat to the region 2, a 120MW coal-fired heat supply boiler is arranged in the region 1, a 50MW heat storage device and a 50MW electric boiler are arranged in the region 2, and the coal-fired heat supply boiler and the 50MW electric boiler are matched with the combined heat and power generation unit to operate, so that the heat balance of each heat supply region is realized.
The method comprises the steps that the wind power photovoltaic system needs electricity and heat in 24 time periods a day and the maximum output data of the wind power photovoltaic system and the photovoltaic system are set, and the size of the standby capacity required in each time period is set to be 5% of the load.
In order to compare the effects before and after the improvement of the spare capacity model of the cogeneration unit, a control variable method is adopted to set two simulation scenes. In scenario one, a traditional standby model of the cogeneration unit is used, i.e. the quantity indicated by the dashed line segment in fig. 2 b; in scenario two, a wind power photovoltaic system operation model is adopted, that is, the quantity represented by the dotted line segment plus the solid line segment in fig. 2 b. The load, wind-solar output and other constraints are the same in scenario one and scenario two.
The start-stop conditions of the three thermal power generating units are obtained through simulation analysis, and as shown in the following table, the start-stop state quantity represents the running state when being 1, and the stop state quantity represents the shutdown state when being 0.
Thermal power generating unit start-stop state (1/0)
Situation one 111
Situation two 110
TABLE 1
It can be seen from table 1 that after the wind power photovoltaic system operation model is applied, three thermal power generating units in the wind power photovoltaic system can meet various operation constraint conditions including the wind power photovoltaic system standby capacity constraint only by starting two thermal power generating units.
Two curves in fig. 3 represent the total spare capacity that can be provided by two cogeneration units in the application-modified wind power photovoltaic system operation model (the invention) in the scenario two and the total spare capacity that can be provided by the units if the conventional wind power photovoltaic system operation model is adopted, which is calculated according to the actual operation point.
Because the demand for electricity is high during the afternoon hours and the wind power available is low, the cogeneration unit must provide more power output to meet the demand for electricity from the wind photovoltaic system, thus resulting in less spare capacity available to the cogeneration unit. If the traditional spare capacity model is adopted according to the actual operating point, the spare capacity provided by the cogeneration unit is gradually reduced to 0MW and lasts for about 7 hours. After the improved spare capacity model is applied, the improved spare capacity model is matched with the heat storage device, the spare capacity of about 10MW can be provided all the time even if the cogeneration unit keeps higher power output, and compared with the spare capacity of 0MW provided by the traditional spare capacity model, the improved spare capacity model is a great improvement and plays a great role in stabilizing the wind power photovoltaic system.
Fig. 4 shows a wind curtailment comparison diagram of each time interval of the scene one and the scene two. Obviously, the total amount of the abandoned wind and abandoned light in the scene two is far less than that of the abandoned wind and abandoned light in the scene one. The two scenes adopt different standby capacity models of the cogeneration units, so that the three thermal power units in the two scenes have different starting and stopping states and different wind power and photovoltaic consumption levels under the condition of standby capacity constraint of a wind power photovoltaic system. In scenario one, the operation of the third thermal power generating unit occupies the electric power capacity of the wind power and the photovoltaic power, and a large wind abandoning and light abandoning phenomenon from 1 to 8 in the morning is caused. Especially at 2 a.m., the capacity factor of the wind farm is very high and the power demand is low, the wind curtailment quantity reaches 84.54MW, which is more than 9 times of the simultaneous wind curtailment quantity (9.05MW) in the scenario two, which is enough to indicate that a large amount of wind power resources are wasted.
According to another aspect of the present invention, as shown in fig. 5, there is provided an apparatus for establishing an operation model of a wind power photovoltaic system, including: an acquisition module 501, an adjustment module 502, and a setup module 503. The acquiring module 501 is configured to analyze a feasible region of the cogeneration unit to acquire a reserve capacity of the cogeneration unit; the adjusting module 502 is used for adjusting the current thermal output of the cogeneration unit by performing heat supply compensation through the heat storage device; the establishing module 503 is configured to analyze a mapping relationship between the current thermal output and the standby capacity of the cogeneration unit to establish a wind power photovoltaic system operation model when the current power output of the cogeneration unit is fixed.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (7)

1. A method for establishing a wind power photovoltaic system operation model is characterized by comprising the following steps:
s1: analyzing a feasible region of a cogeneration unit to obtain the reserve capacity of the cogeneration unit;
s2: adjusting the current thermal output of the cogeneration unit by heat supply compensation through a heat storage device;
s3: when the current power output of the cogeneration unit is fixed, analyzing the mapping relation between the current thermal output of the cogeneration unit and the reserve capacity to establish the wind power photovoltaic system operation model.
2. The method for establishing the wind power photovoltaic system operation model according to claim 1, wherein the feasible region comprises four boundaries: AB. BC, CD and DA; AB represents the maximum power output limit, BC represents the maximum coal consumption limit, CD represents the maximum heating ratio limit, and DA represents the minimum steam consumption limit;
wherein the slope of AB is negative identifying a maximum power output boost of the cogeneration unit when the current thermal output of the cogeneration unit decreases.
3. The method for establishing the wind power photovoltaic system operation model according to claim 2, wherein the step S1 includes:
using the boundary AB expression of the feasible region and the minimum heat output of the cogeneration unit
Figure FDA0002980853140000011
Calculating a maximum power output of the cogeneration unit
Figure FDA0002980853140000012
And
Figure FDA0002980853140000013
are two constants in the boundary AB expression;
outputting the maximum power
Figure FDA0002980853140000014
And the current power output
Figure FDA0002980853140000015
Is used as the reserve capacity rs of the cogeneration unitt，
Figure FDA0002980853140000016
4. The method for establishing the wind power photovoltaic system operation model according to claim 3, wherein the step S2 includes:
when the total heat demand is fixed and a heat balance equation is satisfied, obtaining a corresponding relation between the heat output reduction of the cogeneration unit and the heat supply compensation of the heat storage device;
and utilizing the heat storage device to perform heat supply compensation based on the corresponding relation so as to adjust the current thermal output of the cogeneration unit.
5. The method for establishing the wind power photovoltaic system operation model according to claim 4, wherein the thermodynamic equilibrium equation is
Figure FDA0002980853140000021
Figure FDA0002980853140000022
And
Figure FDA0002980853140000023
representing a maximum thermal output of the energy storage device and a current thermal output of the energy storage device, respectively;
Figure FDA0002980853140000024
for a minimum thermal output of the cogeneration unit,
Figure FDA0002980853140000025
is the current thermal output of the cogeneration unit.
6. The method for establishing the wind power photovoltaic system operation model according to claim 5, wherein the step S3 includes:
analyzing to obtain the maximum power output when the current power output of the cogeneration unit remains fixed
Figure FDA0002980853140000026
Increase and the spare capacity rstThe increment is the same;
according to
Figure FDA0002980853140000027
And
Figure FDA0002980853140000028
deducing the current thermal output of the cogeneration unit
Figure FDA0002980853140000029
And the reserve capacity rstAnd obtaining the wind power photovoltaic system operation model through the mapping relation between the wind power photovoltaic system and the photovoltaic system.
7. The utility model provides an establishing device of wind-powered electricity generation photovoltaic system operation model which characterized in that includes:
the acquisition module is used for analyzing the feasible region of the cogeneration unit to acquire the reserve capacity of the cogeneration unit;
the adjusting module is used for adjusting the current thermal output of the cogeneration unit by performing heat supply compensation through the heat storage device;
and the establishing module is used for analyzing the mapping relation between the current thermal output of the cogeneration unit and the reserve capacity to establish the wind power photovoltaic system operation model when the current power output of the cogeneration unit is fixed.
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