CN112510683A - Incremental power distribution network flexible resource allocation method considering source load uncertainty - Google Patents

Incremental power distribution network flexible resource allocation method considering source load uncertainty Download PDF

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CN112510683A
CN112510683A CN202011268515.1A CN202011268515A CN112510683A CN 112510683 A CN112510683 A CN 112510683A CN 202011268515 A CN202011268515 A CN 202011268515A CN 112510683 A CN112510683 A CN 112510683A
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distribution network
incremental
load
energy storage
power distribution
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CN112510683B (en
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汤涤非
董晨景
李晶
林哲敏
季超
何川
王恺
张伟时
李雅婷
唐家俊
李金城
张智
林振智
杨莉
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Anhui Electric Power Trading Center Co ltd
Zhejiang University ZJU
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Anhui Electric Power Trading Center Co ltd
Zhejiang University ZJU
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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
    • 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
    • H02J3/002—Flicker reduction, e.g. compensation of flicker introduced by non-linear load
    • 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
    • H02J3/008—Circuit arrangements for ac mains or ac distribution networks involving trading of energy or energy transmission rights
    • 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
    • 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
    • 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
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • 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]

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Abstract

The invention discloses a method for allocating flexible resources of an incremental power distribution network by considering source load uncertainty, and belongs to the technical field of power systems. The method comprises the following steps: constructing an interruptible load compensation model of the incremental power distribution network by considering a user interrupt load response curve; an incremental power distribution network energy storage configuration model is established by considering energy storage safe operation constraints; representing uncertainty of distributed power sources and loads in the incremental power distribution network in a multi-scenario manner, constructing a flexible resource joint configuration model of the incremental power distribution network, and solving the model. The invention models the demand side response and the energy storage configuration of the incremental power distribution network and provides a method for jointly configuring interruptible load and energy storage in the incremental power distribution network.

Description

Incremental power distribution network flexible resource allocation method considering source load uncertainty
Technical Field
The invention relates to the technical field of power systems, in particular to a method for allocating flexible resources of an incremental power distribution network by considering source load uncertainty.
Background
Releasing incremental power distribution and electricity selling side services is an important task for a new cycle of power system reform in China, and is also an important measure for constructing an orderly competitive electricity selling side market and improving the investment and operation efficiency of a power distribution network. In 2016, 10 months, the management method for orderly releasing the power distribution network business and the management method for admitting and releasing the power selling companies are issued by the national development and improvement committee and the energy source bureau, and the investment business of the power distribution network is released to the social capital for the first time. By the end of 2019, 4 batches of 404 incremental power distribution service reform test points are started successively all over the country.
A large number of distributed power supplies exist in an incremental distribution network area, and due to double uncertainties of DG and loads, certain pressure exists in stable operation of the incremental distribution network. With the large application of intelligent control and bidirectional communication technology on the user side, energy storage and demand side response become effective modes for stabilizing source load fluctuation and improving operation stability of the incremental power distribution network. How to reasonably configure energy storage and demand side response resources and improve the operation stability of the incremental power distribution network as much as possible under the condition of ensuring the lowest cost is a problem to be researched urgently.
Disclosure of Invention
The invention provides a method for allocating flexible resources of an incremental power distribution network by considering source load uncertainty. The method comprises the steps that an interruptible load compensation model of the incremental power distribution network is established by considering a user interrupt load response curve; an incremental power distribution network energy storage configuration model is established by considering energy storage safe operation constraints; and representing uncertainty of distributed power sources and loads in the incremental power distribution network in a multi-scenario manner, and constructing a flexible resource joint configuration model of the incremental power distribution network. And solving the planning model to obtain a configuration and scheduling scheme of interruptible load and energy storage of the incremental power distribution network, and providing technical guidance for planning and scheduling the incremental power distribution network.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an incremental power distribution network flexibility resource allocation method considering source load uncertainty comprises the following steps:
step 1: constructing an interruptible load compensation model of the incremental power distribution network by considering a user interrupt load response curve;
step 2: an incremental power distribution network energy storage configuration model is established by considering energy storage safe operation constraints;
and step 3: representing uncertainty of distributed power sources and loads in the incremental power distribution network in a multi-scenario manner, constructing a flexible resource joint configuration model of the incremental power distribution network, and solving the model.
In the above technical solution, further, step 1, in consideration of a user interruption load response curve, constructs an incremental distribution network interruptible load compensation model, and the specific implementation method is as follows:
the interruptible load is an effective mode for stabilizing the random fluctuation of the source load and improving the operation stability of the incremental power distribution network. The incremental distribution network needs to be configured with interruptible loads with certain capacity in advance, and communication equipment and control equipment are arranged on a user side so as to realize real-time control of the interruptible loads and directly interrupt the loads in the case of power shortage. The cost of configuring the interruptible load by the incremental distribution network comprises capacity cost and electric quantity cost, wherein the capacity cost is used for purchasing the interruptible load capacity in one year, and the electric quantity cost refers to compensation paid to a user after the interruptible load is called in operation. Total cost C of interruptible loads for incremental distribution network configurationILIs composed of
Figure BDA0002776874320000021
In the formula (I), the compound is shown in the specification,
Figure BDA0002776874320000022
purchase price for capacity that can interrupt load;
Figure BDA0002776874320000023
an interruptible load capacity configured for the incremental distribution network;
Figure BDA0002776874320000024
compensating unit price for the electric quantity of the interruptible load in the time t;
Figure BDA0002776874320000025
is the amount of load interrupted in the time period t under the scene s. OmegasIs the probability of scene s; s is the total number of scenes; t is the total number of the scheduling time sections; Δ t is the duration of the scheduling period;
generally, the charge compensation unit price affects the load amount of the user response interruption. As shown in fig. 2, the response curve of the user is divided into a dead zone, a linear zone, and a saturation zone. When the compensation unit price is lower than the dead zone threshold, the user does not want to interrupt the load; when the threshold value is exceeded, the user starts to respond to the interruption, and in a certain range, the interrupted load quantity of the user linearly rises along with the increase of the compensation unit price; beyond a certain upper limit, the user's ability to interrupt the load tends to saturate and there is no more interruptible capacity.
Based on this, the capacity coefficient lambda can be reducedILTo describe the extent to which an interruptible load responds to the outage compensation price, in the sense that the amount of load interrupted during a period of time is a proportion of the interruptible load capacity, λILIs expressed as
Figure BDA0002776874320000026
In the formula (I), the compound is shown in the specification,
Figure BDA0002776874320000027
and
Figure BDA0002776874320000028
respectively setting a response curve dead zone threshold and a saturation zone threshold of an interruptible load user; etaILIs the slope of the linear region of the interruptible load.
Furthermore, the step 2 is to construct an incremental distribution network energy storage configuration model in consideration of the constraint of energy storage safe operation, and the specific implementation method is as follows:
the energy storage response speed is fast, and charge-discharge conversion is rapid, can effectively stabilize the fluctuation of distributed power source and load, and in addition, the increment distribution network can control the energy storage to charge when the electric quantity is abundant, and control the energy storage to discharge when the electric quantity is in short supply, realizes the transfer of energy on the time axis. Several important parameters of the energy storage device are respectively the rated power PessRated capacity EessAnd a state of charge S. The rated power refers to the maximum power of charging and discharging of the energy storage equipment, the rated capacity refers to the maximum electric quantity which can be stored by the energy storage equipment, and the charge state refers to the proportion of the electric quantity of the energy storage equipment at the current moment in the rated capacity. State of charge S of stored energy at time ttAnd charge and discharge power at the momentState of charge S at a momentt-1Is related to the expression
Figure BDA0002776874320000031
In the formula etachaAnd ηdisRespectively representing the charge and discharge efficiency of stored energy. Pt chaAnd Pt disRespectively charging and discharging power at the moment of energy storage t;
considering the service life and the safety of the energy storage equipment, the following constraints are required to be met during the operation of energy storage:
0≤Pt cha≤Pess
0≤Pt dis≤Pess
Smin≤St≤Smax
in the formula, SminAnd SmaxRespectively the upper and lower limits of the energy storage state of charge.
Compared with interruptible loads, the energy storage investment cost is higher than the interruptible load capacity cost, but the electricity loss cost in operation is lower than the electricity cost. Cost C of incremental distribution network configuration energy storageessIs composed of
Figure BDA0002776874320000032
In the formula, cess、
Figure BDA0002776874320000033
Respectively the fixed investment cost, unit capacity investment cost and unit power investment cost of energy storage; a. theessIs the annual equivalent coefficient of the investment cost of energy storage.
Furthermore, in the step 3, the uncertainty of the distributed power source and the load in the incremental power distribution network is represented in multiple scenes, a flexible resource joint configuration model of the incremental power distribution network is constructed, and the model is solved, wherein the specific implementation method comprises the following steps:
first of all, electricity is constructedThe incremental distribution network power purchasing model in the market environment develops a new cycle of power system reform by oneself, and medium and long-term power markets are established in most provinces to develop marketized transactions. In order to promote the transition from the medium-long-term market to the spot market, a market trading mode taking an electric power curve as a trading target is provided, and three common curves are involved: peak-to-valley-average curve, all-day-average curve, and peak-to-peak-period curve, as shown in fig. 3. Dividing a day into a peak section, a flat section and a valley section by using a peak-valley-flat curve, and setting the electric quantity proportion in different time periods; the electricity quantity of the whole day average curve in each time interval is the same; the electric quantity is equal in the peak time curve from 9:00 to 17:00, and the electric quantity is zero in other time. The purchasing proportion of the three types of curves is reasonably arranged according to the regional load characteristics of the incremental distribution network, so that the power purchasing curve can be fitted with the load curve as much as possible. Electricity purchase cost C of incremental distribution networkconIs composed of
Figure BDA0002776874320000041
In the formula, I is the curve type number purchased by the incremental distribution network; t is the number of scheduling time periods of one day; c. Ci,tThe price is the ith curve at the time period t; beta is ai,tThe ratio of the electric quantity of the ith curve in the t period to the total electric quantity of the ith curve is obtained;
Figure BDA0002776874320000042
and purchasing the total electric quantity of the ith curve for the incremental power distribution network.
Due to uncertainty of distributed power sources and loads, deviation exists between a power purchase curve and a load curve of an incremental power distribution network inevitably, when the incremental power distribution network is in electric quantity shortage/surplus, a positive/negative standby power grid is needed, and the power grid company is paid with the following expenses:
Figure BDA0002776874320000043
in the formula, CnonA fee paid to the grid company for the incremental distribution grid; c. CuAnd cvPositive/negative respectively for the gridThe unit price of the use;
Figure BDA0002776874320000044
and (5) increasing the deviation electric quantity of the power distribution network within a time period t under a scene s.
f (x) is a segmentation function satisfying
Figure BDA0002776874320000045
For convenient handling of f (x), 2 non-negative relaxation variables u are introduceds,t、vs,tLet us order
Figure BDA0002776874320000046
It is obvious that us,t/vs,tThe essence is that the shortage/surplus electric quantity of the incremental power distribution network in the time period t under the scene s is converted into CnonIs expressed as
Figure BDA0002776874320000047
How to improve the operation stability of the power distribution network as far as possible with the minimum cost is the key for planning the incremental power distribution network. The decision variables of the incremental distribution network flexible resource configuration model comprise
Figure BDA0002776874320000048
EessAnd PessAn objective function of
min Ccon+CIL+Cess+Cnon
Besides the constraints of safe operation of the stored energy, the constraints of the model further include:
1) power balance constraint
Figure BDA0002776874320000051
Figure BDA0002776874320000052
In the formula, Pt buyThe method comprises the steps of obtaining the electricity purchasing power in an incremental power distribution network time period t;
Figure BDA0002776874320000053
and
Figure BDA0002776874320000054
the output of wind and light in a time period t under a scene s is obtained;
Figure BDA0002776874320000055
and
Figure BDA0002776874320000056
respectively representing the charge and discharge power of energy stored in a time period t under a scene s;
Figure BDA0002776874320000057
is the load in the scene s over a time period t.
2) Interruptible load constraints, i.e., the amount of load per interruption does not exceed the purchased interruptible load capacity.
Figure BDA0002776874320000058
The invention has the beneficial effects that:
firstly, the method considers a user interrupt load response curve and constructs an interruptible load compensation model of the incremental distribution network;
secondly, the method fully utilizes interruptible loads and stored energy to stabilize the fluctuation of the distributed power supply and the loads, and improves the operation stability of the incremental power distribution network;
thirdly, the method is easy to operate, provides a scheme for realizing regional power and electric quantity balance by using flexible resources for the incremental power distribution network, and has certain practical significance.
Drawings
FIG. 1 is a schematic overall flow chart of the present invention.
Fig. 2 is an interruptible load user response curve.
Fig. 3 is a schematic diagram of three types of curves.
Fig. 4 shows the operation of the incremental distribution network in a certain scenario.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
Fig. 1 is a schematic overall flow chart of the present invention. The invention relates to a method for allocating flexible resources of an incremental power distribution network by considering source load uncertainty, which comprises the following steps of:
step 1: and (4) constructing an interruptible load compensation model of the incremental power distribution network by considering the user interrupt load response curve. The specific implementation method of the step is as follows:
the interruptible load is an effective mode for stabilizing the random fluctuation of the source load and improving the operation stability of the incremental power distribution network. The incremental distribution network needs to be configured with interruptible loads with certain capacity in advance, and communication equipment and control equipment are arranged on a user side so as to realize real-time control of the interruptible loads and directly interrupt the loads in the case of power shortage. The cost of configuring the interruptible load by the incremental distribution network comprises capacity cost and electric quantity cost, wherein the capacity cost is used for purchasing the interruptible load capacity in one year, and the electric quantity cost refers to compensation paid to a user after the interruptible load is called in operation. Total cost C of interruptible loads for incremental distribution network configurationILIs composed of
Figure BDA0002776874320000061
In the formula (I), the compound is shown in the specification,
Figure BDA0002776874320000062
purchase price for capacity that can interrupt load;
Figure BDA0002776874320000063
an interruptible load capacity configured for the incremental distribution network;
Figure BDA0002776874320000064
compensating unit price for the electric quantity of the interruptible load in the time t;
Figure BDA0002776874320000065
is the amount of load interrupted in the time period t under the scene s.
Generally, the charge compensation unit price affects the load amount of the user response interruption. As shown in fig. 2, the response curve of the user is divided into a dead zone, a linear zone, and a saturation zone. When the compensation unit price is lower than the dead zone threshold, the user does not want to interrupt the load; when the threshold value is exceeded, the user starts to respond to the interruption, and in a certain range, the interrupted load quantity of the user linearly rises along with the increase of the compensation unit price; beyond a certain upper limit, the user's ability to interrupt the load tends to saturate and there is no more interruptible capacity.
To reduce the capacity coefficient lambdaILThe response degree of the interruptible load to the power outage compensation price is described, and the interruptible load capacity is the proportion of the interruptible load capacity in a certain period of time. Lambda [ alpha ]ILIs expressed as
Figure BDA0002776874320000066
In the formula (I), the compound is shown in the specification,
Figure BDA0002776874320000067
and
Figure BDA0002776874320000068
respectively setting a response curve dead zone threshold and a saturation zone threshold of an interruptible load user; etaILIs the slope of the linear region of the interruptible load.
Step 2: and (4) constructing an incremental distribution network energy storage configuration model by considering the constraint of safe energy storage operation. The specific implementation method of the step is as follows:
the energy storage response speed is high, the charge-discharge conversion is rapid, and the energy storage system can haveThe fluctuation of the distributed power supply and the load is effectively stabilized. In addition, the incremental power distribution network can control energy storage charging when the electric quantity is sufficient, and control energy storage discharging when the electric quantity is in short supply, so that energy transfer on a time axis is realized. Several important parameters of the energy storage device are respectively the rated power PessRated capacity EessAnd a state of charge S. The rated power refers to the maximum power of charging and discharging of the energy storage equipment, the rated capacity refers to the maximum electric quantity which can be stored by the energy storage equipment, and the charge state refers to the proportion of the electric quantity of the energy storage equipment at the current moment in the rated capacity. State of charge S of stored energy at time ttThe charging and discharging power at the moment and the state of charge S at the previous momentt-1Is related to the expression
Figure BDA0002776874320000071
In the formula etachaAnd ηdisRespectively representing the charge and discharge efficiency of stored energy.
Considering the service life and the safety of the energy storage equipment, the following constraints are required to be met during the operation of energy storage:
0≤Pt cha≤Pess
0≤Pt dis≤Pess
Smin≤St≤Smax
in the formula, SminAnd SmaxRespectively the upper and lower limits of the energy storage state of charge.
Compared with interruptible loads, the energy storage investment cost is higher than the interruptible load capacity cost, but the electricity loss cost in operation is lower than the electricity cost. Cost C of incremental distribution network configuration energy storageessIs composed of
Figure BDA0002776874320000072
In the formula, cess、
Figure BDA0002776874320000073
Respectively the fixed investment cost, unit capacity investment cost and unit power investment cost of energy storage; a. theessIs the annual equivalent coefficient of the investment cost of energy storage.
And step 3: and describing uncertainty of distributed power sources and loads in the incremental power distribution network by adopting multiple scenes, constructing a flexible resource joint configuration model of the incremental power distribution network, and solving the model. The specific implementation method of the step is as follows:
firstly, an incremental distribution network power purchasing model in the power market environment is constructed, a new round of power system reform is developed by the country, a medium-term and long-term power market is established in most provinces, and marketization trading is developed. In order to promote the transition from the medium-long-term market to the spot market, a market trading mode taking an electric power curve as a trading target is provided, and three common curves are involved: peak-to-valley-average curve, all-day-average curve, and peak-to-peak-period curve, as shown in fig. 3. Dividing a day into a peak section, a flat section and a valley section by using a peak-valley-flat curve, and setting the electric quantity proportion in different time periods; the electricity quantity of the whole day average curve in each time interval is the same; the electric quantity is equal in the peak time curve from 9:00 to 17:00, and the electric quantity is zero in other time. The purchasing proportion of the three types of curves is reasonably arranged according to the regional load characteristics of the incremental distribution network, so that the power purchasing curve can be fitted with the load curve as much as possible. Electricity purchase cost C of incremental distribution networkconIs composed of
Figure BDA0002776874320000081
In the formula, I is the curve type number purchased by the incremental distribution network; t is the number of scheduling time periods of one day; beta is ai,tThe ratio of the electric quantity of the ith curve in the t period to the total electric quantity of the ith curve is obtained;
Figure BDA0002776874320000082
and purchasing the total electric quantity of the ith curve for the incremental power distribution network.
Due to uncertainty of distributed power sources and loads, deviation exists between a power purchase curve and a load curve of an incremental power distribution network inevitably, when the incremental power distribution network is in electric quantity shortage/surplus, a positive/negative standby power grid is needed, and the power grid company is paid with the following expenses:
Figure BDA0002776874320000083
in the formula, CnonA fee paid to the grid company for the incremental distribution grid; c. CuAnd cvRespectively serving as positive/negative standby unit prices of the power grid;
Figure BDA0002776874320000084
and (5) increasing the deviation electric quantity of the power distribution network within a time period t under a scene s.
f (x) is a segmentation function satisfying
Figure BDA0002776874320000085
For convenient handling of f (x), 2 non-negative relaxation variables u are introduceds,t、vs,tLet us order
Figure BDA0002776874320000086
It is obvious that us,t/vs,tThe essence is that the shortage/surplus electric quantity of the incremental power distribution network in the time period t under the scene s is converted into CnonIs expressed as
Figure BDA0002776874320000087
How to improve the operation stability of the power distribution network as far as possible with the minimum cost is the key for planning the incremental power distribution network. The decision variables of the incremental distribution network flexible resource configuration model comprise
Figure BDA0002776874320000088
EessAnd PessAn objective function of
min Ccon+CIL+Cess+Cnon
Besides the constraints of safe operation of the stored energy, the constraints of the model further include:
1) power balance constraint
Figure BDA0002776874320000089
Figure BDA0002776874320000091
In the formula, Pt buyThe method comprises the steps of obtaining the electricity purchasing power in an incremental power distribution network time period t;
Figure BDA0002776874320000092
and
Figure BDA0002776874320000093
the output of wind and light in a time period t under a scene s is obtained;
Figure BDA0002776874320000094
and
Figure BDA0002776874320000095
respectively representing the charge and discharge power of energy stored in a time period t under a scene s;
Figure BDA0002776874320000096
is the load in the scene s over a time period t.
2) Interruptible load constraints, i.e., the amount of load per interruption does not exceed the purchased interruptible load capacity.
Figure BDA0002776874320000097
The present invention will be further described with reference to the following specific examples.
Selecting relevant data such as wind power, photovoltaic and load of an incremental distribution network of a certain region to perform simulation analysis on the model, wherein the total load of the region is 60MW, the interruptible capacity is 5MW, the installed capacity of the wind power is 10MW, and the installed capacity of the photovoltaic is 10MW15MW, scheduling period T-24. Interruptible load capacity purchase unit price
Figure BDA0002776874320000098
The dead zone threshold and the saturation zone threshold of the user response curve are respectively 300 yuan/MWh and 800 yuan/MWh. The energy storage charge-discharge efficiency is 0.9, the upper and lower limits of the charge state are 0.1 and 0.9 respectively, and the annual equivalent coefficient Aess＝0.149。
And solving the incremental distribution network flexibility resource combined configuration model to obtain the interruptible load capacity of the incremental distribution network, the energy storage capacity of the incremental distribution network, and the energy storage power of the incremental distribution network, wherein the interruptible load capacity is 2.29MW, the energy storage capacity is 3.98MWh, and the energy storage power is 1.37 MW. The purchase amount of the incremental distribution network to the three curves in one year is 65807MWh, 99412MWh and 7845MWh respectively. Fig. 4 shows an operation condition of the incremental power distribution network in a certain scene, wherein the actual load is obtained after wind and light output is subtracted from the original load. The load is lower at night, the energy storage is always in a charging state from 1:00 to 4:00, and the energy storage reaches the upper limit of the capacity at 4: 00. The incremental distribution network with the increment of 5:00-7:00 cannot absorb redundant purchased electric quantity, and negative deviation is generated. The 8:00 and 18:00-19:00 load is high, although in flat periods, and the incremental distribution network invokes interruptible loads in these two periods. The fluctuation of the load from 9:00 to 17:00 is basically solved by charging and discharging the energy storage, and negative deviations are generated at 12:00 and 17: 00. The load is low between 21:00 and 24:00, the stored energy cannot absorb all negative deviations due to the limitation of the maximum charging power of 1.37MW, and the incremental distribution network uses the negative standby of the power grid. The incremental distribution network can interrupt load and energy storage through scheduling, so that the deviation of a power purchase curve and a load curve is reduced, and the running stability of the distribution network is improved.
It should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (4)

1. An incremental power distribution network flexibility resource allocation method considering source load uncertainty is characterized by comprising the following steps:
step 1: constructing an interruptible load compensation model of the incremental power distribution network by considering a user interrupt load response curve;
step 2: an incremental power distribution network energy storage configuration model is established by considering energy storage safe operation constraints;
and step 3: representing uncertainty of distributed power sources and loads in the incremental power distribution network in a multi-scenario manner, constructing a flexible resource joint configuration model of the incremental power distribution network, and solving the model.
2. The incremental power distribution network flexibility resource allocation method considering source load uncertainty according to claim 1, characterized in that: the specific method for constructing the interruptible load compensation model of the incremental distribution network by considering the user interrupt load response curve in the step 1 is as follows:
an interruptible load with a certain capacity needs to be configured in advance in an incremental power distribution network, and communication equipment and control equipment are arranged on a user side so as to realize real-time control over the interruptible load and directly interrupt the load in the case of power shortage; total cost C of interruptible loads for incremental distribution network configurationILIs composed of
Figure FDA0002776874310000011
In the formula (I), the compound is shown in the specification,
Figure FDA0002776874310000012
purchase price for capacity that can interrupt load;
Figure FDA0002776874310000013
an interruptible load capacity configured for the incremental distribution network;
Figure FDA0002776874310000014
for interruptible load within time period tThe electricity compensation unit price of (2);
Figure FDA0002776874310000015
the load quantity interrupted in the time period t under the scene s is shown; omegasIs the probability of scene s; s is the total number of scenes; t is the total number of the scheduling time sections; Δ t is the duration of the scheduling period;
according to the dead zone, linear zone and saturation zone of user interrupt load response curve to reduce capacity coefficient lambdaILThe response degree of the interruptible load to the power failure compensation price is represented, and the meaning of the response degree is the proportion of the load quantity interrupted in a certain period of time to the interruptible load capacity, lambdaILIs expressed as
Figure FDA0002776874310000016
In the formula (I), the compound is shown in the specification,
Figure FDA0002776874310000017
and
Figure FDA0002776874310000018
respectively setting a response curve dead zone threshold and a saturation zone threshold of an interruptible load user; etaILIs the slope of the linear region of the interruptible load.
3. The incremental power distribution network flexibility resource allocation method considering source load uncertainty according to claim 2, characterized in that: the specific method for constructing the incremental distribution network energy storage configuration model by considering the constraint of safe energy storage operation in the step 2 is as follows:
the energy storage response speed is high, the charge-discharge conversion is rapid, the fluctuation of a distributed power supply and a load can be effectively stabilized, the increment power distribution network controls energy storage charging when the electric quantity is sufficient, and controls energy storage discharging when the electric quantity is in short supply, so that the energy transfer on a time axis is realized; state of charge S of stored energy at time ttThe charging and discharging power at the moment and the state of charge S at the previous momentt-1Is related to the expression
Figure FDA0002776874310000021
In the formula etachaAnd ηdisRespectively representing the charge and discharge efficiency of stored energy; eessIs the rated capacity of the energy storage device; pt chaAnd Pt disRespectively charging and discharging power at the moment of energy storage t;
considering the service life and the safety of the energy storage equipment, the following constraints are required to be met during the operation of energy storage:
0≤Pt cha≤Pess
0≤Pt dis≤Pess
Smin≤St≤Smax
in the formula, SminAnd SmaxRespectively, upper and lower limits of the energy storage state of charge, PessThe energy storage device is rated for power.
Cost C of incremental distribution network configuration energy storageessIs composed of
Figure FDA0002776874310000022
In the formula, cess、
Figure FDA0002776874310000023
Respectively the fixed investment cost, unit capacity investment cost and unit power investment cost of energy storage; a. theessIs the annual equivalent coefficient of the investment cost of energy storage.
4. The method for incremental distribution network flexibility resource allocation considering source load uncertainty according to claim 3, wherein the method comprises the following steps: in the step 3, the uncertainty of the distributed power source and the load in the incremental power distribution network is represented in multiple scenes, a flexible resource joint configuration model of the incremental power distribution network is constructed, and the specific method for solving the model is as follows:
according to regional load characteristics, the purchase proportion of three types of curves, namely a peak-valley average curve, an all-day average curve and a peak period curve, is reasonably arranged in the incremental distribution network, so that a power purchase curve is fitted with a load curve as much as possible; electricity purchase cost C of incremental distribution networkconIs composed of
Figure FDA0002776874310000031
In the formula, I is the curve type number purchased by the incremental distribution network; t is the number of scheduling time periods of one day; c. Ci,tThe price is the ith curve at the time period t; beta is ai,tThe ratio of the electric quantity of the ith curve in the t period to the total electric quantity of the ith curve is obtained;
Figure FDA0002776874310000032
purchasing the total electric quantity of the ith curve for the incremental power distribution network;
when the incremental power distribution network is in electric quantity shortage/surplus, the positive/negative standby of the power grid is needed to be used, and the power grid company is paid with the following cost:
Figure FDA0002776874310000033
in the formula, CnonA fee paid to the grid company for the incremental distribution grid; c. CuAnd cvRespectively serving as positive/negative standby unit prices of the power grid;
Figure FDA0002776874310000034
increasing the deviation electric quantity of the power distribution network within a time period t under a scene s;
f (x) is a segmentation function satisfying
Figure FDA0002776874310000035
For convenient handling of f (x), 2 non-negative relaxation variables u are introduceds,t、vs,tLet us order
Figure FDA0002776874310000036
It is obvious that us,t/vs,tThe essence is that the shortage/surplus electric quantity of the incremental power distribution network in the time period t under the scene s is converted into CnonIs expressed as
Figure FDA0002776874310000037
The decision variables of the incremental distribution network flexible resource configuration model comprise
Figure FDA0002776874310000038
EessAnd PessAn objective function of
min Ccon+CIL+Cess+Cnon
Besides the constraints of safe operation of the stored energy, the constraints of the model further include:
1) power balance constraint
Figure FDA0002776874310000039
Figure FDA00027768743100000310
In the formula, Pt buyThe method comprises the steps of obtaining the electricity purchasing power in an incremental power distribution network time period t;
Figure FDA0002776874310000041
and
Figure FDA0002776874310000042
the output of wind and light in a time period t under a scene s is obtained;
Figure FDA0002776874310000043
and
Figure FDA0002776874310000044
respectively charging and discharging power of energy storage in a time period t under a scene s;
Figure FDA0002776874310000045
load in a time period t under a scene s;
2) interruptible load constraint, i.e. the amount of load per interruption does not exceed the purchased interruptible load capacity:
Figure FDA0002776874310000046
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