CN111900719A - Power grid adequacy evaluation method, device and system considering flexible controllable load - Google Patents

Power grid adequacy evaluation method, device and system considering flexible controllable load Download PDF

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CN111900719A
CN111900719A CN202010571067.6A CN202010571067A CN111900719A CN 111900719 A CN111900719 A CN 111900719A CN 202010571067 A CN202010571067 A CN 202010571067A CN 111900719 A CN111900719 A CN 111900719A
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power
flexible controllable
adequacy
model
power grid
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CN111900719B (en
Inventor
陆娟娟
闪鑫
江叶峰
熊浩
付伟
罗建裕
张振华
王毅
查国强
杨科
顾雪楠
王晨
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State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
NARI Group Corp
Nari Technology Co Ltd
NARI Nanjing Control System Co Ltd
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State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
NARI Group Corp
Nari Technology Co Ltd
NARI Nanjing Control System Co Ltd
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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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
    • H02J3/144—Demand-response operation of the power transmission or distribution network
    • 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
    • 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
    • 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]
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/222—Demand response systems, e.g. load shedding, peak shaving

Abstract

The invention discloses a power grid adequacy evaluation method, device and system considering flexible controllable load, wherein the method comprises the following steps: obtaining a 220kV operation partition model by adopting a topology searching method based on the obtained power grid operation model, section data and operation partition boundary definition data; obtaining an operation subarea to which the flexible controllable load belongs based on the flexible controllable load grid-connected point information and the 220kV operation subarea model, tracing a power supply path in the operation subarea, finding out a 220kV bus to which the flexible controllable load belongs, and obtaining a virtual equivalent flexible controllable load model corresponding to the 220kV bus and the adjustability thereof; and calculating the power grid adequacy based on the virtual equivalent flexible controllable load model and the adjustable capacity thereof, and finishing the power grid adequacy evaluation considering the flexible controllable load. According to the invention, the power grid and the subarea power supply adequacy in the current and future periods are evaluated by considering the flexible controllable load regulation capacity, so that the power grid subarea power generation situation perception is realized.

Description

Power grid adequacy evaluation method, device and system considering flexible controllable load
Technical Field
The invention belongs to the technical field of improvement of load dispatching capacity of a power system, and particularly relates to a power grid adequacy evaluation method, device and system considering flexible controllable loads.
Background
Under the condition of adjusting the operation mode of the power grid, the capacity of the system for continuously supplying power and electric quantity to users is mainly considered, and the adequacy of the power grid is one of important indexes for measuring the reliability and the economy of the power system. With the continuous expansion of the scale of the power system and the gradual increase of the running characteristics, certain abundant indexes which are simple and easy to calculate without considering network blockage of the existing provincial power grid are increasingly difficult to meet the demand of sensing the distribution balance situation of the modern power system. On the other hand, the energy transformation revolution and the future 'clean low-carbon, safe and efficient' energy system put forward the comprehensive requirements for constructing 'source-network-load-storage' coordinated development on the power grid, enhancing the response capability of the demand side and improving the negative control capability of the power grid. Currently, the controllable means of the power grid in the traditional power generation tracking load mode are almost exhausted. With the access of a large number of novel energy utilization devices such as distributed power supplies, micro-grids, energy storage devices and electric vehicles, the abundant regulation and control resources of the power grid electricity generation and utilization balance are effectively expanded. Under the background, the resources on the load side are fully considered, the elasticity of the power grid is enhanced, and the analysis and calculation of the partition adequacy of the power grid are improved.
Disclosure of Invention
Aiming at the problems, the invention provides a power grid adequacy evaluation method considering flexible controllable loads, which evaluates the power grid and the subarea power supply adequacy in the current and future periods by considering the flexible controllable load regulation capacity, and realizes the power grid subarea power generation situation perception.
In order to achieve the technical purpose and achieve the technical effects, the invention is realized by the following technical scheme:
in a first aspect, the invention provides a method for evaluating the adequacy of a power grid in consideration of a flexible controllable load, which comprises the following steps:
obtaining a 220kV operation partition model by adopting a topology searching method based on the obtained power grid operation model, section data and operation partition boundary definition data;
obtaining an operation subarea to which the flexible controllable load belongs based on the flexible controllable load grid-connected point information and the 220kV operation subarea model, tracing a power supply path in the operation subarea, finding out a 220kV bus to which the flexible controllable load belongs, and obtaining a virtual equivalent flexible controllable load model corresponding to the 220kV bus and the adjustability thereof;
and calculating the power grid adequacy based on the virtual equivalent flexible controllable load model and the adjustable capacity thereof, and finishing the power grid adequacy evaluation considering the flexible controllable load.
Optionally, the obtaining method of the 220kV running partition model includes:
acquiring a power grid operation model, section data and operation partition boundary definition data;
and based on the relation between the equipment model and the physical topology in the power grid operation model, the section data and the operation partition boundary definition data, automatically identifying the partition range by adopting a topology searching method, and separating a 220kV operation partition model from the power grid operation model.
Optionally, the method for obtaining the virtual equivalent flexible controllable load model corresponding to the 220kV bus comprises:
based on the flexible controllable load grid-connected point information and the partition equipment information in the 220kV operation partition model, a topology searching method is adopted to trace back the power supply path, and 220kV buses to which the flexible controllable loads belong are found out;
and performing equivalent aggregation on all the flexible controllable loads supplied with power by the found 220kV bus respectively to obtain virtual equivalent flexible controllable loads corresponding to the 220kV bus.
Optionally, the method for calculating the adjustability of the virtual equivalent flexible controllable load model includes:
and (3) counting and analyzing reported data of the flexible controllable load adjusting capacity based on the requirement of the adjusting and controlling service on the flexible controllable load control response capacity, carrying out equivalent aggregation on the controllable flexible loads according to different response times to obtain the adjustable capacity of the virtual equivalent flexible controllable loads at different time scales, and using the adjustable capacity as the value of the virtual equivalent flexible controllable loads of the 220kV buses, namely the adjustable capacity of the virtual equivalent flexible controllable load model.
Optionally, the method for calculating the grid adequacy includes:
obtaining an optimization model, the optimization model comprising: an objective function and a constraint;
the objective function is:
Figure BDA0002549528350000021
wherein the content of the first and second substances,
Figure BDA0002549528350000022
the power adjustment quantity of the unit m in the 220kV operation subarea,
Figure BDA0002549528350000023
adjusting the received power of a key main transformer k of 500kV in a subarea;
Figure BDA0002549528350000024
adjusting power for the virtual equivalent controllable flexible load l;
the constraint conditions are as follows:
Figure BDA0002549528350000025
wherein the content of the first and second substances,
Figure BDA0002549528350000026
the method comprises the steps that M active power operation upper limit, minimum technical output, power adjustment amount and current initial power of units in a 220kV operation subarea are set, and M is the number of the units in the subarea;
Figure BDA0002549528350000027
the received power adjustment amount of a key main transformer K of 500kV in a subarea is defined, wherein K is a key of 500kVA principal variable;
Figure BDA0002549528350000028
adjusting the adjustment amount and the second-level down-regulation capacity of a virtual equivalent flexible controllable load L in a 220kV operation zone, wherein L is the total number of the virtual equivalent flexible controllable loads in the 220kV operation zone;
Figure BDA0002549528350000031
the current active and active adjustment quantity, the current reactive and reactive adjustment quantity of all the generators on the bus node i are calculated;
Figure BDA0002549528350000032
current active and active adjustment quantity, current reactive and reactive adjustment quantity of all loads of a bus node i are calculated;
Figure BDA0002549528350000033
the active adjustment quantity and the reactive adjustment quantity of all flexible controllable loads of a bus node i are obtained;
Figure BDA0002549528350000034
the initial active power, the active power variable quantity, the active power upper limit and the active power lower limit of the branch with the head end and the tail end being i and j respectively;
Figure BDA0002549528350000035
ΔPTrespectively setting the upper limit and the lower limit of active power, the initial active power and the active power adjustment quantity of the stable section; vi、VjIs the voltage amplitude, G, of the bus node i, jij、Bij、θijMutual admittance and phase angle difference of bus nodes i and j are respectively;
combining a sensitivity reverse equivalent pairing method, the load adjustment quantity delta P of the bus node i is adjustedlidAnd (3) adjusting, solving the optimization model by adopting a continuous power flow algorithm under the condition of meeting the safety constraint condition of the power grid, obtaining the adequacy of the power grid, and realizing the maximization of the adequacy.
Optionally, the method for solving the power grid adequacy includes the following steps:
setting a power adjustment step length lambda;
repeatedly executing the following steps:
make the load power in 220kV operation subarea
Figure BDA0002549528350000036
Synchronous increase of output
Figure BDA0002549528350000037
Generating power by the inner and outer sets according to regions
Figure BDA0002549528350000038
And the received power
Figure BDA0002549528350000039
Carrying out calibration analysis on alternating current power flow when the power shortage is borne in proportion;
after the tide check, if the out-of-limit equipment exists, the load adjustment amount is carried out by adopting an equivalent pairing principle based on adjusting the sensitivity S of the bus node branch
Figure BDA00025495283500000310
And adjusting until the solution of the optimization model is completed, and obtaining the power grid adequacy.
Optionally, the method for solving the power grid adequacy further includes:
if the load adjustment quantity based on the equivalent pairing principle of the node branch sensitivity S is adopted
Figure BDA00025495283500000311
If the adjustment cannot eliminate the equipment out-of-limit, the power grid adequacy of the flexible controllable load which is not considered in the current state can be obtained, and meanwhile, based on the adjustment of the bus node branch sensitivity S, a load shedding strategy is executed on the flexible controllable load
Figure BDA00025495283500000312
And is
Figure BDA00025495283500000313
And summing the generator, the 500kV main transformer and the virtual equivalent flexible adjustment quantity to obtain the power grid adequacy considering the flexible controllable load.
In a second aspect, the present invention provides a device for evaluating the adequacy of a power grid considering flexible controllable loads, comprising:
the first computing unit is used for obtaining a 220kV operation partition model by adopting a topology searching method based on the obtained power grid operation model, section data and operation partition boundary definition data;
the second computing unit is used for obtaining an operation subarea to which the flexible controllable load belongs based on the flexible controllable load grid-connected point information and the 220kV operation subarea model, tracing a power supply path in the operation subarea, finding out a 220kV bus to which the flexible controllable load belongs, and obtaining a virtual equivalent flexible controllable load model corresponding to the 220kV bus and the adjustability thereof;
and the third calculating unit is used for calculating the power grid adequacy based on the virtual equivalent flexible controllable load model and the adjustable capacity thereof, and finishing the power grid adequacy evaluation considering the flexible controllable load.
Optionally, the obtaining method of the 220kV running partition model includes:
acquiring a power grid operation model, section data and operation partition boundary definition data;
and based on the relation between the equipment model and the physical topology in the power grid operation model, the section data and the operation partition boundary definition data, automatically identifying the partition range by adopting a topology searching method, and separating a 220kV operation partition model from the power grid operation model.
Optionally, the method for obtaining the virtual equivalent flexible controllable load model corresponding to the 220kV bus comprises:
based on the flexible controllable load grid-connected point information and the partition equipment information in the 220kV operation partition model, a topology searching method is adopted to trace back the power supply path, and 220kV buses to which the flexible controllable loads belong are found out;
and performing equivalent aggregation on all the flexible controllable loads supplied with power by the found 220kV bus respectively to obtain virtual equivalent flexible controllable loads corresponding to the 220kV bus.
Optionally, the method for calculating the adjustability of the virtual equivalent flexible controllable load model includes:
and (3) counting and analyzing reported data of the flexible controllable load adjusting capacity based on the requirement of the adjusting and controlling service on the flexible controllable load control response capacity, carrying out equivalent aggregation on the controllable flexible loads according to different response times to obtain the adjustable capacity of the virtual equivalent flexible controllable loads at different time scales, and using the adjustable capacity as the value of the virtual equivalent flexible controllable loads of the 220kV buses, namely the adjustable capacity of the virtual equivalent flexible controllable load model.
Optionally, the method for calculating the grid adequacy includes:
obtaining an optimization model, the optimization model comprising: an objective function and a constraint;
the objective function is:
Figure BDA0002549528350000041
wherein the content of the first and second substances,
Figure BDA0002549528350000042
the power adjustment quantity of the unit m in the 220kV operation subarea,
Figure BDA0002549528350000043
adjusting the received power of a key main transformer k of 500kV in a subarea;
Figure BDA0002549528350000044
adjusting power for the virtual equivalent controllable flexible load l;
the constraint conditions are as follows:
Figure BDA0002549528350000051
wherein the content of the first and second substances,
Figure BDA0002549528350000052
for m active operation of the unit in the 220kV operation subareaThe upper limit, the minimum technical output, the power adjustment amount and the current initial power, wherein M is the number of the sets in the subarea;
Figure BDA0002549528350000053
the adjustment quantity of the power receiving power of a key main transformer K of 500kV in a subarea is K, and K is a key main variable of 500 kV;
Figure BDA0002549528350000054
adjusting the adjustment amount and the second-level down-regulation capacity of a virtual equivalent flexible controllable load L in a 220kV operation zone, wherein L is the total number of the virtual equivalent flexible controllable loads in the 220kV operation zone;
Figure BDA0002549528350000055
the current active and active adjustment quantity, the current reactive and reactive adjustment quantity of all the generators on the bus node i are calculated;
Figure BDA0002549528350000056
current active and active adjustment quantity, current reactive and reactive adjustment quantity of all loads of a bus node i are calculated;
Figure BDA0002549528350000057
the active adjustment quantity and the reactive adjustment quantity of all flexible controllable loads of a bus node i are obtained;
Figure BDA0002549528350000058
the initial active power, the active power variable quantity, the active power upper limit and the active power lower limit of the branch with the head end and the tail end being i and j respectively;
Figure BDA0002549528350000059
ΔPTrespectively setting the upper limit and the lower limit of active power, the initial active power and the active power adjustment quantity of the stable section; vi、VjIs the voltage amplitude, G, of the bus node i, jij、Bij、θijMutual admittance and phase angle difference of bus nodes i and j are respectively;
by combining the sensitivity reverse equivalent pairing method, the load adjustment amount of the bus node i is adjusted
Figure BDA00025495283500000510
And (3) adjusting, solving the optimization model by adopting a continuous power flow algorithm under the condition of meeting the safety constraint condition of the power grid, obtaining the adequacy of the power grid, and realizing the maximization of the adequacy of the power grid.
Optionally, the method for solving the power grid adequacy includes the following steps:
setting a power adjustment step length lambda;
repeatedly executing the following steps:
make the load power in 220kV operation subarea
Figure BDA00025495283500000511
Synchronous increase of output
Figure BDA00025495283500000512
Generating power by the inner and outer sets according to regions
Figure BDA00025495283500000513
And the received power
Figure BDA00025495283500000514
Carrying out calibration analysis on alternating current power flow when the power shortage is borne in proportion;
after the tide check, if the out-of-limit equipment exists, the load adjustment amount is carried out by adopting an equivalent pairing principle based on adjusting the sensitivity S of the bus node branch
Figure BDA0002549528350000061
And (4) performing integration until the solution of the optimization model is completed, and obtaining the power grid adequacy.
Optionally, the method for solving the power grid adequacy further includes:
if the load adjustment quantity based on the equivalent pairing principle of the node branch sensitivity S is adopted
Figure BDA0002549528350000062
If the adjustment cannot eliminate the equipment out-of-limit, the power grid adequacy under the current state without considering the flexible controllable load can be obtained, and simultaneously,load shedding strategy for flexible controllable load based on adjustment of bus node branch sensitivity S
Figure BDA0002549528350000063
And is
Figure BDA0002549528350000064
And summing the generator, the 500kV main transformer and the virtual equivalent flexible adjustment quantity to obtain the power grid adequacy considering the flexible controllable load.
In a third aspect, the invention provides a power grid adequacy assessment system considering flexible controllable loads, which comprises a storage medium and a processor;
the storage medium is used for storing instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method according to any one of the first aspects.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a power grid adequacy evaluation method, a device and a system considering flexible controllable loads, wherein grid-connected information and regulation capacity of the flexible controllable loads in a regulation and control system are combined, a topology search technology is utilized to realize operation partition dynamic topology and flexible load power supply path tracing, an equivalent aggregation method is adopted to calculate flexible load partition regulation capacity, a virtual equivalent flexible controllable load model corresponding to a 220kV bus is constructed, finally, a power grid adequacy evaluation index is calculated by utilizing the virtual equivalent flexible controllable load model, the method, the device and the system are easy to realize, the operation analysis requirements of large-scale source network charge storage power grid partition adequacy application scenes are closely combined, and the method, the device and the system have certain popularization and application values.
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In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic flow chart of a specific embodiment of a power grid adequacy evaluation method considering a flexible controllable load according to 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 further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of the invention.
The following detailed description of the principles of the invention is provided in connection with the accompanying drawings.
Example 1
The embodiment of the invention provides a power grid adequacy evaluation method considering flexible controllable loads, which comprises the following steps of:
(1) obtaining a 220kV operation partition model by adopting a topology searching method based on the obtained power grid operation model, section data and operation partition boundary definition data;
(2) obtaining an operation subarea to which the flexible controllable load belongs based on the flexible controllable load grid-connected point information and the 220kV operation subarea model, tracing a power supply path in the operation subarea, finding out a 220kV bus to which the flexible controllable load belongs, and obtaining a virtual equivalent flexible controllable load model corresponding to the 220kV bus and the adjustability thereof;
(3) and calculating the power grid adequacy based on the virtual equivalent flexible controllable load model and the adjustable capacity thereof, and finishing the power grid adequacy evaluation considering the flexible controllable load.
In a specific implementation manner of the embodiment of the invention, the power grid operation model may select a provincial and regional integrated model, which specifically includes a grid structure of 10kV and above voltage class, a detailed equipment model and a physical topological relation; the flexible controllable load specifically comprises: the method comprises the steps that load equipment such as mass electric vehicles, non-industrial air conditioners, energy storage equipment and intelligent buildings in the society enters a dispatching master station after bottom layer aggregation of load energy suppliers to become a novel regulating resource of a power grid, model information of the load equipment specifically comprises controllable load up-down regulation rated capacity and 10kV feeder grid-connected point information in a province-local integrated model, when a multi-circuit grid-connected line is available and grid-connected change occurs, a load operator submits a grid-connected updating alarm, the grid-connected 10kV feeder is updated in real time through a main distribution system, and refined modeling of the controllable load is achieved.
In a specific implementation manner of the embodiment of the present invention, the method for obtaining the 220kV running partition model includes:
acquiring a power grid operation model, section data and operation partition boundary definition data;
and based on the relation between the equipment model and the physical topology in the power grid operation model, the section data and the operation partition boundary definition data, automatically identifying the partition range by adopting a topology searching method, and separating a 220kV operation partition model from the power grid operation model.
In a specific implementation manner of the embodiment of the present invention, the method for obtaining the virtual equivalent flexible controllable load model corresponding to all 220kV buses includes:
based on the flexible controllable load grid-connected point information and the partition equipment information in the 220kV operation partition model, a topology searching method is adopted to trace back the power supply path, and 220kV buses to which the flexible controllable loads belong are found out;
performing equivalent aggregation on each flexible controllable load supplied with power by each 220kv bus to obtain a virtual equivalent flexible controllable load corresponding to each 220kv bus; in specific implementations, the equivalent polymerization can be achieved by simply summing the individual adjustment capabilities.
In a specific implementation manner of the embodiment of the present invention, the method for calculating the adjustability of each virtual equivalent flexible controllable load in the virtual equivalent flexible controllable load model includes:
on the basis of the requirement of the regulation and control service on the control response capability of the flexible controllable load, the reported data of the regulation capability of the flexible controllable load is statistically analyzed, the controllable flexible load is equivalently aggregated according to different response time scales such as a second level, a minute level, an hour level and the like, the adjustable capability of the virtual equivalent flexible controllable load with different response times is obtained and is used as the value of the virtual equivalent flexible controllable load of each 220kV bus, namely the adjustable capability of the virtual equivalent flexible controllable load model.
The method for calculating the power grid adequacy comprises the following steps:
obtaining an optimization model, the optimization model comprising: an objective function and a constraint;
the objective function is:
Figure BDA0002549528350000081
wherein the content of the first and second substances,
Figure BDA0002549528350000082
the power adjustment quantity of the unit m in the 220kV operation subarea,
Figure BDA0002549528350000083
adjusting the received power of a key main transformer k of 500kV in a subarea;
Figure BDA0002549528350000084
adjusting power for the virtual equivalent controllable flexible load l;
the constraint conditions are as follows:
Figure BDA0002549528350000085
wherein the content of the first and second substances,
Figure BDA0002549528350000086
the method comprises the steps that M active power operation upper limit, minimum technical output, power adjustment amount and current initial power of units in a 220kV operation subarea are set, and M is the number of the units in the subarea;
Figure BDA0002549528350000087
the adjustment quantity of the power receiving power of a key main transformer K of 500kV in a subarea is K, and K is a key main variable of 500 kV;
Figure BDA0002549528350000088
adjusting the adjustment amount and the second-level down-regulation capacity of a virtual equivalent flexible controllable load L in a 220kV operation zone, wherein L is the total number of the virtual equivalent flexible controllable loads in the 220kV operation zone;
Figure BDA0002549528350000089
the current active and active adjustment quantity, the current reactive and reactive adjustment quantity of all the generators on the bus node i are calculated;
Figure BDA00025495283500000810
current active and active adjustment quantity, current reactive and reactive adjustment quantity of all loads of a bus node i are calculated;
Figure BDA00025495283500000811
the active adjustment quantity and the reactive adjustment quantity of all flexible controllable loads of a bus node i are obtained;
Figure BDA00025495283500000812
ΔPij、
Figure BDA00025495283500000813
the initial active power, the active power variable quantity, the active power upper limit and the active power lower limit of the branch with the head end and the tail end being i and j respectively;
Figure BDA00025495283500000814
ΔPTrespectively setting the upper limit and the lower limit of active power, the initial active power and the active power adjustment quantity of the stable section; vi、VjIs the voltage amplitude, G, of the bus node i, jij、Bij、θijMutual admittance and phase angle difference of bus nodes i and j are respectively; by combining the sensitivity reverse equivalent pairing method, the load adjustment amount of the bus node i is adjusted
Figure BDA0002549528350000091
And (3) adjusting, solving the optimization model by adopting a continuous power flow algorithm under the condition of meeting the safety constraint condition of the power grid, obtaining the adequacy of the power grid, and realizing the maximization of the subarea adequacy.
Specifically, the method for solving the power grid adequacy comprises the following steps:
setting a power adjustment step length lambda;
repeatedly executing the following steps:
make 2Load power in 20kV operation subarea
Figure BDA0002549528350000092
Synchronous increase of output
Figure BDA0002549528350000093
Generating power by the inner and outer sets according to regions
Figure BDA0002549528350000094
And the received power
Figure BDA0002549528350000095
Carrying out calibration analysis on alternating current power flow when the power shortage is borne in proportion;
after the tide check, if the out-of-limit equipment exists, the load adjustment amount is carried out by adopting an equivalent pairing principle based on adjusting the sensitivity S of the bus node branch
Figure BDA0002549528350000096
Adjusting until the solution of the optimization model is completed to obtain the power grid adequacy;
taking branch out of limits as an example, the out of limit amount
Figure BDA0002549528350000097
By modifying the bus node with high sensitivity of the branch according to the delta P/S load adjustment amount and locking the load power of the node, i.e.
Figure BDA0002549528350000098
The bus node with low sensitivity to the branch is added to correct the load according to delta P/S, so that the integral power balance in the subarea is ensured.
The method for solving the power grid adequacy further comprises the following steps:
if the load adjustment quantity based on the equivalent pairing principle of the node branch sensitivity S is adopted
Figure BDA0002549528350000099
If the adjustment cannot eliminate the equipment out-of-limit, the unaccounted flexibility in the current state can be obtainedThe power grid adequacy of the controllable load is adjusted, and meanwhile, based on adjustment of the sensitivity S of the branch circuit of the bus node, a load shedding strategy is executed on the flexible controllable load
Figure BDA00025495283500000910
And is
Figure BDA00025495283500000911
According to
Figure BDA00025495283500000912
The generator, the main transformer and the virtual equivalent flexible adjustment quantity are summed to obtain a power grid adequacy considering the flexible controllable load;
based on future section data, virtual equivalent flexible controllable load minute-level and hour-level down-regulation capacity are respectively used for replacing the capacity in the optimization model
Figure BDA00025495283500000913
And constructing a future time period adequacy evaluation optimization model, and solving the power grid adequacy of each future time period.
Example 2
Based on example 1, the inventive example differs from example 1 in that:
the method for obtaining the virtual equivalent flexible controllable load model corresponding to all 220kV buses further comprises the following steps: and integrating the virtual equivalent flexible controllable loads corresponding to all 220kv buses to form a partitioned virtual equivalent flexible controllable load model.
The calculation formula of the power grid adequacy is as follows:
the power grid adequacy is the maximum power supply capacity of the power grid, namely the dispatching power consumption and the virtual equivalent flexible controllable load down-regulation capacity;
the maximum power supply capacity of the power grid is the sum of the maximum output of the unit in the subarea and the maximum power receiving capacity of the 500kV main transformer in the subarea, the dispatching power utilization is the actual power utilization load of the subarea, and the grading power reduction capacity of the flexible controllable load is obtained through the flexible controllable load reduction capacity.
The partition adequacy index which does not consider the power grid safety constraint in the real-time state and the partition adequacy index which does not consider the power grid safety constraint in the future state can be calculated and obtained based on the calculation formula of the power grid adequacy.
Example 3
Based on the same inventive concept as embodiment 1, an embodiment of the present invention provides a power grid adequacy evaluation apparatus considering flexible controllable load, including:
the first computing unit is used for obtaining a 220kV operation partition model by adopting a topology searching method based on the obtained power grid operation model, section data and operation partition boundary definition data;
the second calculating unit is used for obtaining an operation subarea to which the flexible controllable load belongs based on the flexible controllable load grid-connected point information and the 220kV operation subarea model, tracing a power supply path in the operation subarea, finding out a 220kV bus to which the flexible controllable load belongs, and further obtaining virtual equivalent flexible controllable load models corresponding to all 220kV buses;
and the third calculating unit is used for calculating the power grid adequacy based on the virtual equivalent flexible controllable load model and finishing the power grid adequacy evaluation considering the flexible controllable load.
In a specific implementation manner of the embodiment of the present invention, the method for obtaining the 220kV running partition model includes:
acquiring a power grid operation model, section data and operation partition boundary definition data;
and based on the relation between the equipment model and the physical topology in the power grid operation model, the section data and the operation partition boundary definition data, automatically identifying the partition range by adopting a topology searching method, and separating a 220kV operation partition model from the power grid operation model.
In a specific implementation manner of the embodiment of the present invention, the method for obtaining the virtual equivalent flexible controllable load model corresponding to all 220kV buses includes:
based on the flexible controllable load grid-connected point information and the partition equipment information in the 220kV operation partition model, a topology searching method is adopted to trace back the power supply path, and 220kV buses to which the flexible controllable loads belong are found out;
performing equivalent aggregation on each flexible controllable load supplied with power by each 220kv bus to obtain a virtual equivalent flexible controllable load corresponding to each 220kv bus;
and integrating the virtual equivalent flexible controllable loads corresponding to all 220kv buses to form a virtual equivalent flexible controllable load model.
In a specific implementation manner of the embodiment of the present invention, the method for calculating the value of each virtual equivalent flexible controllable load in the virtual equivalent flexible controllable load model includes:
and counting and analyzing reported data of the flexible controllable load adjusting capacity based on the requirement of the regulation and control service on the flexible controllable load control response capacity, carrying out equivalent aggregation on the controllable flexible loads according to different time scales, and obtaining the adjustable capacity of the virtual equivalent flexible controllable loads at different time scales as the value of each virtual equivalent flexible controllable load.
Example 4
Based on the same inventive concept as embodiment 1, the embodiment of the invention provides a power grid adequacy evaluation system considering flexible controllable load, which comprises a storage medium and a processor;
the storage medium is used for storing instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method according to any of embodiment 1.
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.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (15)

1. A power grid adequacy assessment method considering flexible controllable loads is characterized by comprising the following steps:
obtaining a 220kV operation partition model by adopting a topology searching method based on the obtained power grid operation model, section data and operation partition boundary definition data;
obtaining an operation subarea to which the flexible controllable load belongs based on the flexible controllable load grid-connected point information and the 220kV operation subarea model, tracing a power supply path in the operation subarea, finding out a 220kV bus to which the flexible controllable load belongs, and obtaining a virtual equivalent flexible controllable load model corresponding to the 220kV bus and the adjustability thereof;
and calculating the power grid adequacy based on the virtual equivalent flexible controllable load model and the adjustable capacity thereof, and finishing the power grid adequacy evaluation considering the flexible controllable load.
2. The method for evaluating the adequacy of the power grid in consideration of the flexible controllable load as claimed in claim 1, wherein: the method for obtaining the 220kV operation partition model comprises the following steps:
acquiring a power grid operation model, section data and operation partition boundary definition data;
and based on the relation between the equipment model and the physical topology in the power grid operation model, the section data and the operation partition boundary definition data, automatically identifying the partition range by adopting a topology searching method, and separating a 220kV operation partition model from the power grid operation model.
3. The method for evaluating the adequacy of the power grid in consideration of the flexible controllable load as claimed in claim 1, wherein: the method for obtaining the virtual equivalent flexible controllable load model corresponding to the 220kV bus comprises the following steps:
based on the flexible controllable load grid-connected point information and the partition equipment information in the 220kV operation partition model, a topology searching method is adopted to trace back the power supply path, and 220kV buses to which the flexible controllable loads belong are found out;
and performing equivalent aggregation on all the flexible controllable loads supplied with power by the found 220kV bus respectively to obtain virtual equivalent flexible controllable loads corresponding to the 220kV bus.
4. The method for evaluating the adequacy of the power grid in consideration of the flexible controllable load according to claim 3, wherein: the method for calculating the adjustability of the virtual equivalent flexible controllable load model comprises the following steps:
and (3) counting and analyzing reported data of the flexible controllable load adjusting capacity based on the requirement of the adjusting and controlling service on the flexible controllable load control response capacity, carrying out equivalent aggregation on the controllable flexible loads according to different response times to obtain the adjustable capacity of the virtual equivalent flexible controllable loads at different time scales, and using the adjustable capacity as the value of the virtual equivalent flexible controllable loads of the 220kV buses, namely the adjustable capacity of the virtual equivalent flexible controllable load model.
5. The method for evaluating the adequacy of the power grid in consideration of the flexible controllable load as claimed in claim 1, wherein: the method for calculating the power grid adequacy comprises the following steps:
obtaining an optimization model, the optimization model comprising: an objective function and a constraint;
the objective function is:
Figure FDA0002549528340000021
wherein the content of the first and second substances,
Figure FDA0002549528340000022
the power adjustment quantity of the unit m in the 220kV operation subarea,
Figure FDA0002549528340000023
adjusting the received power of a key main transformer k of 500kV in a subarea;
Figure FDA0002549528340000024
adjusting power for the virtual equivalent controllable flexible load l;
the constraint conditions are as follows:
Figure FDA0002549528340000025
wherein the content of the first and second substances,
Figure FDA0002549528340000026
the active power operation upper limit, the minimum technical output, the power adjustment amount and the current initial power of the unit M in the 220kV operation subarea are obtained, and M is the number of the units in the subarea;
Figure FDA0002549528340000027
the adjustment quantity of the power receiving power of a key main transformer K of 500kV in a subarea is K, and K is a key main variable of 500 kV;
Figure FDA0002549528340000028
adjusting the adjustment amount and the second-level down-regulation capacity of a virtual equivalent flexible controllable load L in a 220kV operation zone, wherein L is the total number of the virtual equivalent flexible controllable loads in the 220kV operation zone;
Figure FDA0002549528340000029
the current active and active adjustment quantity, the current reactive and reactive adjustment quantity of all the generators on the bus node i are calculated;
Figure FDA00025495283400000210
current active and active adjustment quantity, current reactive and reactive adjustment quantity of all loads of a bus node i are calculated;
Figure FDA00025495283400000211
the active adjustment quantity and the reactive adjustment quantity of all flexible controllable loads of a bus node i are obtained;
Figure FDA00025495283400000212
ΔPij、
Figure FDA00025495283400000213
the initial active power, the active power variable quantity, the active power upper limit and the active power lower limit of the branch with the head end and the tail end being i and j respectively;
Figure FDA00025495283400000214
ΔPTrespectively setting the upper limit and the lower limit of active power, the initial active power and the active power adjustment quantity of the stable section; vi、VjIs the voltage amplitude, G, of the bus node i, jij、Bij、θijMutual admittance and phase angle difference of bus nodes i and j are respectively;
by combining the sensitivity reverse equivalent pairing method, the load adjustment amount of the bus node i is adjusted
Figure FDA00025495283400000215
And (3) adjusting, solving the optimization model by adopting a continuous power flow algorithm under the condition of meeting the safety constraint condition of the power grid, obtaining the adequacy of the power grid, and realizing the maximization of the adequacy.
6. The method for evaluating the adequacy of the power grid in consideration of the flexible controllable load according to claim 5, wherein: the method for solving the power grid adequacy comprises the following steps:
setting a power adjustment step length lambda;
repeatedly executing the following steps:
make the load power in 220kV operation subarea
Figure FDA0002549528340000031
Synchronous increase of output
Figure FDA0002549528340000032
Generating power by the inner and outer sets according to regions
Figure FDA0002549528340000033
And the received power
Figure FDA0002549528340000034
Carrying out calibration analysis on alternating current power flow when the power shortage is borne in proportion;
after the tide check, if the out-of-limit equipment exists, the load adjustment amount is carried out by adopting an equivalent pairing principle based on adjusting the sensitivity S of the bus node branch
Figure FDA0002549528340000035
And adjusting until the solution of the optimization model is completed, and obtaining the power grid adequacy.
7. The method for evaluating the adequacy of the power grid in consideration of the flexible controllable load according to claim 6, wherein: the method for solving the power grid adequacy further comprises the following steps:
if the equal-quantity pairing principle based on the node branch sensitivity S is adopted to carry out load adjustment
Figure FDA0002549528340000036
If the adjustment cannot eliminate the equipment out-of-limit, the power grid adequacy of the flexible controllable load which is not considered in the current state can be obtained, and meanwhile, based on the bus node branch sensitivity S, a load shedding strategy is executed on the flexible controllable load
Figure FDA0002549528340000037
And is
Figure FDA0002549528340000038
And summing the generator, the 500kV main transformer and the virtual equivalent flexible adjustment quantity to obtain the power grid adequacy considering the flexible controllable load.
8. An apparatus for evaluating a power grid adequacy in consideration of a flexible controllable load, comprising:
the first computing unit is used for obtaining a 220kV operation partition model by adopting a topology searching method based on the obtained power grid operation model, section data and operation partition boundary definition data;
the second computing unit is used for obtaining an operation subarea to which the flexible controllable load belongs based on the flexible controllable load grid-connected point information and the 220kV operation subarea model, tracing a power supply path in the operation subarea, finding out a 220kV bus to which the flexible controllable load belongs, and obtaining a virtual equivalent flexible controllable load model corresponding to the 220kV bus and the adjustability thereof;
and the third calculating unit is used for calculating the power grid adequacy based on the virtual equivalent flexible controllable load model and the adjustable capacity thereof, and finishing the power grid adequacy evaluation considering the flexible controllable load.
9. The utility model relates to a take flexible controllable load's electric wire netting adequacy evaluation device of claim 8 into account, characterized by: the method for obtaining the 220kV operation partition model comprises the following steps:
acquiring a power grid operation model, section data and operation partition boundary definition data;
and based on the relation between the equipment model and the physical topology in the power grid operation model, the section data and the operation partition boundary definition data, automatically identifying the partition range by adopting a topology searching method, and separating a 220kV operation partition model from the power grid operation model.
10. The utility model relates to a take flexible controllable load's electric wire netting adequacy evaluation device of claim 8 into account, characterized by: the method for obtaining the virtual equivalent flexible controllable load model corresponding to the 220kV bus comprises the following steps:
based on the flexible controllable load grid-connected point information and the partition equipment information in the 220kV operation partition model, a topology searching method is adopted to trace back the power supply path, and 220kV buses to which the flexible controllable loads belong are found out;
and performing equivalent aggregation on all the flexible controllable loads supplied with power by the found 220kV bus respectively to obtain virtual equivalent flexible controllable loads corresponding to the 220kV bus.
11. The utility grid adequacy assessment device considering flexible controllable load as claimed in claim 10, wherein: the method for calculating the adjustability of the virtual equivalent flexible controllable load model comprises the following steps:
and (3) counting and analyzing reported data of the flexible controllable load adjusting capacity based on the requirement of the adjusting and controlling service on the flexible controllable load control response capacity, carrying out equivalent aggregation on the controllable flexible loads according to different response times to obtain the adjustable capacity of the virtual equivalent flexible controllable loads at different time scales, and using the adjustable capacity as the value of the virtual equivalent flexible controllable loads of the 220kV buses, namely the adjustable capacity of the virtual equivalent flexible controllable load model.
12. The utility model relates to a take flexible controllable load's electric wire netting adequacy evaluation device of claim 8 into account, characterized by: the method for calculating the power grid adequacy comprises the following steps:
obtaining an optimization model, the optimization model comprising: an objective function and a constraint;
the objective function is:
Figure FDA0002549528340000041
wherein the content of the first and second substances,
Figure FDA0002549528340000042
the power adjustment quantity of the unit m in the 220kV operation subarea,
Figure FDA0002549528340000043
adjusting the received power of a key main transformer k of 500kV in a subarea;
Figure FDA0002549528340000044
adjusting power for the virtual equivalent controllable flexible load l;
the constraint conditions are as follows:
Figure FDA0002549528340000045
wherein the content of the first and second substances,
Figure FDA0002549528340000046
the method comprises the steps that M active power operation upper limit, minimum technical output, power adjustment amount and current initial power of units in a 220kV operation subarea are set, and M is the number of the units in the subarea;
Figure FDA0002549528340000047
the adjustment quantity of the power receiving power of a key main transformer K of 500kV in a subarea is K, and K is a key main variable of 500 kV;
Figure FDA0002549528340000048
adjusting the adjustment amount and the second-level down-regulation capacity of a virtual equivalent flexible controllable load L in a 220kV operation zone, wherein L is the total number of the virtual equivalent flexible controllable loads in the 220kV operation zone;
Figure FDA0002549528340000051
the current active and active adjustment quantity, the current reactive and reactive adjustment quantity of all the generators on the bus node i are calculated;
Figure FDA0002549528340000052
current active and active adjustment quantity, current reactive and reactive adjustment quantity of all loads of a bus node i are calculated;
Figure FDA0002549528340000053
the active adjustment quantity and the reactive adjustment quantity of all flexible controllable loads of a bus node i are obtained;
Figure FDA0002549528340000054
ΔPij、
Figure FDA0002549528340000055
the initial active power, the active power variable quantity, the active power upper limit and the active power lower limit of the branch with the head end and the tail end being i and j respectively;
Figure FDA0002549528340000056
ΔPTrespectively setting the upper limit and the lower limit of active power, the initial active power and the active power adjustment quantity of the stable section; vi、VjIs the voltage amplitude, G, of the bus node i, jij、Bij、θijMutual admittance and phase angle difference of bus nodes i and j are respectively;
by combining the sensitivity reverse equivalent pairing method, the load adjustment amount of the bus node i is adjusted
Figure FDA00025495283400000515
And (3) adjusting, solving the optimization model by adopting a continuous power flow algorithm under the condition of meeting the safety constraint condition of the power grid, obtaining the adequacy of the power grid, and realizing the maximization of the adequacy of the power grid.
13. The utility grid adequacy assessment device considering flexible controllable load as claimed in claim 12, wherein: the method for solving the power grid adequacy comprises the following steps:
setting a power adjustment step length lambda;
repeatedly executing the following steps:
make the load power in 220kV operation subarea
Figure FDA00025495283400000514
Synchronous increase of output
Figure FDA0002549528340000057
Generating power by the inner and outer sets according to regions
Figure FDA0002549528340000058
And the received power
Figure FDA0002549528340000059
Carrying out calibration analysis on alternating current power flow when the power shortage is borne in proportion;
after the tide check, if the out-of-limit equipment exists, the load adjustment amount is carried out by adopting an equivalent pairing principle based on adjusting the sensitivity S of the bus node branch
Figure FDA00025495283400000510
And adjusting until the solution of the optimization model is completed, and obtaining the power grid adequacy.
14. The utility grid adequacy assessment device considering flexible controllable load as claimed in claim 13, wherein: the method for solving the power grid adequacy further comprises the following steps:
if the load adjustment quantity based on the equivalent pairing principle of the node branch sensitivity S is adopted
Figure FDA00025495283400000511
If the adjustment cannot eliminate the equipment out-of-limit, the power grid adequacy of the flexible controllable load which is not considered in the current state can be obtained, and meanwhile, based on the adjustment of the bus node branch sensitivity S, a load shedding strategy is executed on the flexible controllable load
Figure FDA00025495283400000512
And is
Figure FDA00025495283400000513
And summing the generator, the 500kV main transformer and the virtual equivalent flexible adjustment quantity to obtain the power grid adequacy considering the flexible controllable load.
15. A power grid adequacy assessment system considering flexible controllable loads is characterized by comprising a storage medium and a processor;
the storage medium is used for storing instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method according to any one of claims 1 to 7.
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