CN111369172A - Power system load power protection control method, system, equipment and storage medium - Google Patents

Power system load power protection control method, system, equipment and storage medium Download PDF

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Publication number
CN111369172A
CN111369172A CN202010200737.3A CN202010200737A CN111369172A CN 111369172 A CN111369172 A CN 111369172A CN 202010200737 A CN202010200737 A CN 202010200737A CN 111369172 A CN111369172 A CN 111369172A
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power
power system
load
power supply
determining
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邱灿树
林新宇
陈健新
舒坚
杨凯
梁小强
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Guangdong Power Grid Co Ltd
Chaozhou Power Supply Bureau of Guangdong Power Grid Co Ltd
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Guangdong Power Grid Co Ltd
Chaozhou Power Supply Bureau of Guangdong Power Grid Co Ltd
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Priority to CN202010200737.3A priority Critical patent/CN111369172A/en
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q10/00—Administration; Management
    • G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
    • G06Q10/063—Operations research, analysis or management
    • G06Q10/0637—Strategic management or analysis, e.g. setting a goal or target of an organisation; Planning actions based on goals; Analysis or evaluation of effectiveness of goals
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q10/00—Administration; Management
    • G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
    • G06Q10/063—Operations research, analysis or management
    • G06Q10/0635—Risk analysis of enterprise or organisation activities
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q10/00—Administration; Management
    • G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
    • G06Q10/063—Operations research, analysis or management
    • G06Q10/0639—Performance analysis of employees; Performance analysis of enterprise or organisation operations
    • G06Q10/06393—Score-carding, benchmarking or key performance indicator [KPI] analysis
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
    • G06Q50/06—Electricity, gas or water supply
    • 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

Abstract

The invention discloses a load power protection control method, a system, equipment and a storage medium for a power system. The power system load power protection control method comprises the following steps: establishing an element model of the power system; determining risk indexes of various fault states in the power system according to the element models and the operation reliability indexes; and determining a load power protection control strategy of the power system by combining the operation reliability index, the risk index and the risk degree of the cascading failure. The technical scheme of the embodiment of the invention relieves the technical problems that the technical support means cannot meet the service requirement and the adaptability of the solution scheme is not strong and the like caused by the fact that most power distribution network scheduling depends on experience scheduling or blind scheduling in the prior art, improves the reliability and lowers the economic cost brought by comprehensively considering various factors, is beneficial to establishing an optimal control decision scheme and forms a whole set of real-time monitoring, evaluation, early warning and control system.

Description

Power system load power protection control method, system, equipment and storage medium
Technical Field
The embodiment of the invention relates to the technical field of smart power grids, in particular to a method, a system, equipment and a storage medium for controlling load power protection of a power system.
Background
The safety and reliability of a large power grid are always the key points of power grid operation attention, a regional power grid is also an important factor influencing the quality of electric energy and the reliability of power supply, and most faults in the power grid occur in the regional power grid. Only if the safe and stable operation of the regional power grid is ensured, the safe and reliable operation of the whole power grid can be ensured. Therefore, it is very necessary to develop security defense work for more regional power grids and research on security assessment methods. Through regional power grid safety analysis, the vulnerability and weak area of the system can be found timely and comprehensively, defense and improvement measures are further provided, and accidents are effectively inhibited from happening and expanding.
At present, due to the fact that the measurement information of the power distribution network is few and the information quality is not high, the power distribution network scheduling is mostly performed by means of experience or is in a blind tuning state. Although the construction of distribution automation has made great progress, there are still many aspects to be improved, such as: the supporting means in the prior art cannot meet the business requirements; the system standardization degree and the consistency and normalization of information interaction need to be refined and perfected; the level of practical use of the basic application functions needs to be improved; the adaptability of the power distribution network application analysis scheme is not strong; the system needs to be enhanced in adaptability to new energy access, and the technical problems in power distribution network scheduling need to be improved urgently.
Disclosure of Invention
The invention provides a load power conservation control method, a load power conservation control system, load power conservation equipment and a storage medium of a power system, and an optimal control decision scheme is established by comprehensively considering the reliability improvement and economic cost brought by various factors.
In a first aspect, an embodiment of the present invention provides a power system load power protection control method, including:
establishing an element model of the power system;
determining risk indexes of various fault states in the power system according to the element models and the operation reliability indexes;
and determining a load power protection control strategy of the power system by combining the operation reliability index, the risk index and the risk degree of the cascading failure.
Optionally, modeling the components of the power system comprises:
acquiring real-time operation information of the power system, and calculating operation reliability parameters;
and establishing an element model of the power system according to the real-time operation information and the operation reliability parameters.
Optionally, determining risk indicators of various fault states in the power system according to the element models and the operational reliability indicators, including:
determining probabilities and risk consequences of various instantaneous fault states in the power system;
and calculating the risk index according to the risk consequence of the fault state, and sequencing the fault state according to the probability of the fault state.
Optionally, determining the probability and risk consequences of various transient fault conditions in the power system includes:
determining various instantaneous fault states in the power system by adopting a minimum path and/or minimum cut algorithm based on an element model of the power system, and calculating the probability of the fault states;
assessing risk consequences of the fault condition.
Optionally, the operational reliability index includes a power supply capacity of a main line in the power system, and the cascading failure includes a branch line failure in the power system;
and determining a power protection control strategy of the load of the power system by combining the operation reliability index, the risk index and the risk degree of the cascading failure, wherein the power protection control strategy comprises the following steps:
when a branch line in the power system fails, determining the power supply capacity of a main line in the power system;
determining electricity limiting electric quantity and electricity limiting load according to the total power supply load of the power system and the power supply capacity of the main line;
and limiting the electricity based on the electricity limiting electric quantity and the electricity limiting load, and recovering power supply for the failed branch line.
Optionally, when a branch line in the power system fails, determining the power supply capacity of a main line in the power system includes:
when the failed branch line supplies power to the single-side power supply, judging whether the failed branch line is out of loop or not according to the positive power supply direction of the main line in the power system;
if the failed branch line is not looped or the failed branch line is connected with a power supply, determining the power supply capacity of the main line in the power system according to the tide data;
and if the failed branch line is out of loop and is not connected with the power supply, searching the main line and determining the power supply capacity of the main line.
Optionally, determining the electricity-limiting electric quantity and the electricity-limiting load according to the total supply load of the power system and the supply capacity of the main line, includes:
judging whether the total power supply load of the power system is larger than the power supply capacity of the main line or not;
and if the total power supply load is greater than the power supply capacity of the main line, determining the power limiting electric quantity according to the total power supply load and the power supply capacity of the main line, and determining the power limiting load according to the structure of the power system and according to at least one of a nearby principle, a maximum power supply conversion principle, a highest reliability principle and a manual designation principle.
In a second aspect, an embodiment of the present invention further provides a power system load power protection control system, including:
the component model establishing module is used for establishing a component model of the power system;
the risk index determining module is used for determining risk indexes of various fault states in the power system according to the element models and the operation reliability indexes;
and the control strategy determination module is used for determining a load power protection control strategy of the power system by combining the operation reliability index, the risk index and the risk degree of the cascading failure.
In a third aspect, an embodiment of the present invention further provides an apparatus, where the apparatus includes:
one or more processors;
storage means for storing one or more programs;
when the one or more programs are executed by the one or more processors, the one or more processors are caused to implement the power system load guarantee control method according to the first aspect.
In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the power system load protection control method according to the first aspect.
The embodiment provides a power system load power protection control method, a system, equipment and a storage medium, wherein the power system load power protection control method determines risk indexes of various fault states in a power system based on an element model and an operation reliability index of the power system, comprehensively considers the operation reliability index, the risk index and the risk degree of cascading faults of a regional power grid, determines a power system load power protection control strategy and controls the power system. The technical problems that in the prior art, the technical support means cannot meet the service requirements and the adaptability of the solution is not strong due to the fact that most of distribution network scheduling is scheduled by experience or blind scheduling are solved. According to the fault state of the power system and the risk degree of cascading faults, the operation risk visualization index of the power system is given, the key influence factors of the operation reliability of the power system are determined based on the risk analysis result, the method is beneficial to quickly searching weak elements and weak links in the system, reliability improvement and economic cost brought by various factors are comprehensively considered, an optimal control decision scheme is beneficial to being established, and a whole set of real-time monitoring, evaluation, early warning and control system is formed.
Drawings
Fig. 1 is a schematic flow chart of a power system load power protection control method according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of another power system load protection control method according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of another power system load protection control method according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of another power system load protection control method according to an embodiment of the present invention;
fig. 5 is a schematic block diagram of a power system load protection control system according to an embodiment of the present invention;
fig. 6 is a schematic block diagram of another power system load protection control system according to an embodiment of the present invention;
fig. 7 is a schematic block diagram of another power system load protection control system according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an apparatus provided in an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a schematic flow chart of a power system load power protection control method according to an embodiment of the present invention. The present embodiment is applicable to the case of making an assistant decision on the important load power protection of the power system, and the method may be executed by a power system load power protection control system, where the system may be implemented in a software and/or hardware manner, and the apparatus may be configured in an electronic device, such as a server or a terminal device, where a typical terminal device includes a mobile terminal, specifically includes a computer and the like. As shown in fig. 1, the power system load power protection control method specifically includes the following steps:
and S110, establishing an element model of the power system.
The elements of the power system may be various components constituting the power system, including various primary equipment elements, secondary equipment elements, various control elements, and the like. Primary equipment refers to equipment that directly produces, delivers and distributes high voltage electrical energy, such as generators, transformers, circuit breakers, and busbars. The secondary equipment is low-voltage electrical equipment which is used for detecting, controlling, adjusting and protecting the primary equipment and providing patrol conditions or signals for operation and maintenance personnel. Such as measuring instruments, relays, operating switches, buttons, automatic control equipment, computers, signal controls, control cables and their power supplies, etc.
Specifically, a large amount of real-time operation Data of the power System may be acquired from a Remote Terminal Unit (RTU), a Data Acquisition And monitoring Control System (SCADA), And an Energy Management System (EMS) of the power System, And an element model of the power System may be established in consideration of real-time changes of operation conditions such as a line power flow, a bus voltage, a System frequency, And the like, in combination with a Unit operation mode, a load level, a network structure, And the like.
And S120, determining risk indexes of various fault states in the power system according to the element models and the operation reliability indexes.
Specifically, the power system operational reliability includes operational adequacy and operational safety. The former is that the power system has enough generating capacity and enough transmission capacity, can satisfy the peak load requirement of the user at any time, and represents the steady state performance of the power grid, and the latter is that the power system is safe in the accident state and can avoid chain reaction without causing out-of-control and large-area power failure, and represents the dynamic performance of the power system. The power system is large in scale, reliability of the power system can be evaluated according to the functional characteristics of regional power grids, and the power grids in different regions can have special operation reliability indexes, such as power supply capacity, power supply voltage range, current range, temperature, power factor and the like of the power system. In the operation process of the power system, various faults occur, such as power failure or branch circuit breaking, and the risk index refers to the risk degree of various fault states in the power system, namely the degree exceeding the operation reliability index. Various fault states in the power system can be enumerated based on the component models, and risk indexes of the various fault states are determined by combining the operation reliability indexes.
And S130, determining a load power protection control strategy of the power system by combining the operation reliability index, the risk index and the risk degree of the cascading failure.
Specifically, cascading failures are due to the correlation between electrical quantities of the power system, with other failures occurring when a failure occurs. Cascading failures can affect the operational reliability of the power system, and have corresponding risk degrees, namely the degree of the cascading failures exceeding the operational reliability index. Illustratively, various cascading failures in the power system can be enumerated based on the component models, and the risk degree of the various cascading failures can be determined by combining the operation reliability indexes. The method can comprehensively consider the probability and the risk index of various fault states in the power system and the probability and the risk degree of various cascading faults in the power system on the basis of the operation reliability index of the regional power grid of the power system, determine the control direction of a load power-protection control strategy of the power system, and control the power system so as to avoid or solve the fault state and the cascading faults with the highest probability or the highest risk degree on the basis that the power system meets the operation reliability index.
According to the technical scheme, risk indexes of various fault states in the power system are determined based on an element model and an operation reliability index of the power system, the operation reliability index, the risk indexes and the risk degree of cascading faults of a regional power grid are comprehensively considered, a load power-protection control strategy of the power system is determined, and the power system is controlled. The technical problems that in the prior art, the technical support means cannot meet the service requirements and the adaptability of the solution is not strong due to the fact that most of distribution network scheduling is scheduled by experience or blind scheduling are solved. According to the fault state of the power system and the risk degree of cascading faults, the operation risk visualization index of the power system is given, the key influence factors of the operation reliability of the power system are determined based on the risk analysis result, the method is beneficial to quickly searching weak elements and weak links in the system, reliability improvement and economic cost brought by various factors are comprehensively considered, an optimal control decision scheme is beneficial to being established, and a whole set of real-time monitoring, evaluation, early warning and control system is formed.
Example two
Fig. 2 is a schematic flow chart of another power system load power protection control method according to an embodiment of the present invention. On the basis of the technical scheme, the load power-protection control method of the power system is further optimized. As shown in fig. 2, the power system load power protection control method specifically includes:
s210, acquiring real-time operation information of the power system, and calculating operation reliability parameters.
Specifically, real-time operation information of the power system, such as various element parameters, voltage, current, and the like of the power system, may be acquired through systems such as the RTU, the SCADA, and the EMS, and the real-time operation information may be counted and analyzed to obtain operation reliability parameters of the power system, for example, operation reliability parameters such as power supply capability, power supply power, and power factor of a regional power grid main line may be determined through calculation.
And S220, establishing an element model of the power system according to the real-time operation information and the operation reliability parameters.
Specifically, the real-time operation information and the operation reliability parameters are combined, the influence of real-time changes of operation conditions such as line tide, bus voltage and system frequency on an element reliability model is considered, and the element model of the power system is established according to the unit operation mode, the load level, the network structure and the like.
And S230, determining the probability and risk consequences of various instantaneous fault states in the power system.
Specifically, various transient fault states that may occur in the power system may be enumerated based on the component model of the power system, and since various fault states have uncertainties and severity of different fault states are different, the probability that each fault state may occur and corresponding risk consequences need to be determined according to the component model.
Illustratively, there are a large number of operational equipment components in the power system, such as generators, transmission lines, transformers, etc., each with its own different probabilistic model, which can be modeled using markov chains, only to the extent that the models are complex. The probability of each instantaneous fault state in the power system can be analyzed by experience on the basis of statistics of the fault state and the repair historical data of the element, the probability of each fault state of the system is obtained by calculation, and then the reliability of the system is objectively evaluated. For example, a state space method may be used to determine the probability of various transient fault states, a multi-state outage model of a single element in the power system is used to form a state space diagram of the system by a markov method, and a frequency-duration method is used to calculate the system state probability and transition frequency, so as to obtain a desired power distribution system probability and other indicators. Optionally, determining the probability and risk consequences of various transient fault conditions in the power system includes: determining various instantaneous fault states in the power system by adopting a minimum path and/or minimum cut algorithm based on an element model of the power system, and calculating the probability of the fault states; assessing the risk consequences of the fault condition. Specifically, according to an element model of the power system and a structure of the power system, various states in the power system can be established based on a minimum path and/or a minimum cut algorithm, and a fault state and a probability thereof are determined, so that a risk assessment method facing a regional power grid operation mode is established.
S240, calculating a risk index according to the risk consequence of the fault state, and sequencing the fault state according to the probability of the fault state.
Specifically, the risk index of the fault state is determined according to the risk consequences brought by the fault state, that is, the degree of exceeding the operational reliability index of the system after various fault states occur. Based on the probability of each fault state possibly occurring, the fault states are sorted according to the probability of occurrence from large to small. So as to guide the control direction of the power system load protection control strategy by combining the probability of the possible occurrence of the fault state and the risk index thereof. Alternatively, the operation reliability index may be a predetermined index or an index improved in combination with the regional power grid structure.
And S250, determining a load power protection control strategy of the power system by combining the operation reliability index, the risk index and the risk degree of the cascading failure.
According to the technical scheme of the embodiment, the fault state in the power system is analyzed, and the fault risk assessment method facing the regional power grid operation mode is established based on the element model and the network topology structure of the power grid. According to the fault state of the power system and the risk degree of the cascading faults, the operation risk visualization index of the power system is given, a necessary information basis is provided for operation mode risk assessment, and the operation safety of the power system is favorably improved.
EXAMPLE III
Fig. 3 is a schematic flow chart of another power system load power protection control method according to an embodiment of the present invention. On the basis of the technical scheme, the load power-protection control method of the power system is further optimized.
Optionally, the operational reliability indicator includes a power supply capability of a main line in the power system, and the cascading failure includes a branch line failure in the power system. Specifically, the power supply capacity of the main line in the power system may include power supply capacity, a cascading failure including a branch line failure in the power system means that the branch line is powered off, and a risk caused by the branch line failure in the power system to reliable operation of the power system is high.
Correspondingly, as shown in fig. 3, the power system load power protection control method specifically includes:
and S310, establishing an element model of the power system.
And S320, determining risk indexes of various fault states in the power system according to the element models and the operation reliability indexes.
S330, when the branch line in the power system fails, determining the power supply capacity of the main line in the power system.
Specifically, when a power failure fault occurs in a branch line in the power system, the main line of the power network in which the branch line is located may be traced, and the power supply capability of the main line may be determined to determine whether the main line has the capability of restoring power to the failed branch line.
And S340, determining electricity limiting electric quantity and electricity limiting load according to the total load of the power system and the power supply capacity of the main line.
For example, if the power supply capacity of the main line is smaller than the total power supply load of the current power system, the power supply of a part of branch lines needs to be suspended, and the load needing to be limited and the limited power amount are determined according to the difference between the total power supply load and the power supply capacity of the main line and the component model of the power system.
And S350, limiting the power based on the power limiting electric quantity and the power limiting load, and recovering the power supply for the failed branch line.
Specifically, after power limitation is performed based on the power-limited electric quantity and the power-limited load, the current power supply capacity of the power system meets the total load supply requirement, and the failed branch line can be connected to the main line to recover power supply for the failed branch line.
According to the technical scheme, when the power system has a cascading failure of branch lines, the power system load power protection control strategy can be determined based on the operational reliability index of the power supply capacity of the main line of the power system, power supply can be recovered for the branch lines in failure in time, loss of the power system is avoided, the self-healing capacity of the power system is improved, and the power supply quality and the safety performance of the power system are improved.
Example four
Fig. 4 is a schematic flow chart of another power system load power protection control method according to an embodiment of the present invention. On the basis of the technical scheme, the method for determining the power supply capacity, the electricity limiting capacity and the electricity limiting load of the main line in the power system is further optimized. As shown in fig. 4, the power system load power protection control method specifically includes:
s401, establishing an element model of the power system.
S402, determining risk indexes of various fault states in the power system according to the element models and the operation reliability indexes.
And S403, judging whether the failure branch line supplies power for the single-side power supply.
Specifically, it is determined whether the dead branch line has only one side power supply to supply power to it. If the failure branch line supplies power for the single-side power supply, S404 is executed; if the failed branch line is not powered by the single-side power supply, S410 is executed.
And S404, judging whether the failed branch line is looped according to the positive power supply direction of the main line in the power system.
In particular, the open loop refers to an operation of breaking a closed network of lines, transformers or breaker strings from operation in the electrical operation of the power system. Whether the failed branch line is out of loop can be judged according to the positive power supply direction of the main line in the power system. If the failed branch line is looped off, executing S405; if the failed branch line is not looped, S407 is executed.
S405, judging whether the failed branch line is connected with a power supply.
Specifically, the power source judgment can be performed on the power receiving test of the dead branch line. If the failed branch line is not connected with the power supply, executing S406; if the failed branch line is connected to the power source, S407 is executed.
And S406, searching a main line, and determining the power supply capacity of the main line.
Specifically, if the failed branch line is not connected to the power supply, the power supply main line search may be performed by excluding the line from the power receiving side node as a starting point to determine the main line of the power system, and after the main line is determined, the power supply capacity of the main line is determined.
And S407, determining the power supply capacity of the main line in the power system according to the power flow data.
Illustratively, if the failed branch line is not looped off, or if the failed branch line is connected with a power supply, the power supply capacity of the main line in the power system is traced based on the power flow data.
And S408, judging whether the total power supply load of the power system is larger than the power supply capacity of the main line.
Specifically, the total supply load of the power system may be an overall load of all branch lines in the power system, and the power supply capacity of the main line may be a power supply capacity of the main line. Judging whether the total supply load is greater than the power supply capacity of the main line, and if the total supply load is greater than the power supply capacity of the main line, executing S409; if the total power supply load is less than the power supply capacity of the main line, S410 is performed.
And S409, determining the electricity limiting electric quantity according to the total supply load and the power supply capacity of the main line, and determining the electricity limiting load according to the structure of the power system and according to at least one of a nearby principle, a maximum energy supply conversion principle, a highest reliability principle and a manual designation principle.
For example, if the total power supply capacity is greater than the power supply capacity of the main line, the power limiting capacity may be determined according to a difference between the total power supply capacity and the power supply capacity of the main line, and the power amount in the power system may be limited, so that the power supply capacity of the main line may meet the total power supply capacity after power limiting. The specific power limitation of which part, or which area, of the load is to be determined is determined in accordance with the structure of the power system and at least one of the principles of the proximity, the maximum rotational power, the maximum reliability and the manual specification. The nearby principle can be that a branch line is selected nearby to limit the electric quantity of the branch line, so that the labor cost is reduced, and the power supply is recovered for the failed branch line as soon as possible; the maximum energy conversion capacity refers to the capacity of a power system for transferring loads when branch circuits in a local area power grid fail, can be generally quantized into the proportion of the transferable loads occupying the area power grid, and can select the electricity limiting load according to the principle so as to limit the electricity within the maximum energy conversion capacity; the highest reliability principle can be that after part of the load is limited, the power system can be maintained to operate reliably; the manual specification principle may be manually and empirically established, the electricity limiting load is selected, and the electricity limiting load may be determined by combining at least one of the above principles to maintain the stability of the power system. Optionally, the electricity-limiting load may also be a branch line with other power supplies besides the main line, so that the electricity-limiting branch line is not failed, and power can be restored to the failed branch line, thereby effectively ensuring the reliable operation of the power system.
And S410, restoring power supply for the failed branch line.
Specifically, if the failure branch line supplies power to the single-side power supply, the failure branch line can be connected to a main line of the power system through a switch, and power supply is restored for the failure branch line through the main line; if the failure branch line is not supplied with power by the single-side power supply, the failure branch line can be connected to other side power supplies through the switch, and power is restored to the failure branch line through the other side power supplies.
According to the technical scheme, when the power system has a cascading failure of branch lines, the power system load power protection control strategy can be determined based on the operational reliability index of the power supply capacity of the main line of the power system, power supply can be recovered for the branch lines in failure in time, loss of the power system is avoided, the self-healing capacity of the power system is improved, and the power supply quality and the safety performance of the power system are improved.
Example four
Fig. 5 is a schematic block diagram of a power protection control system for a load of an electrical power system according to an embodiment of the present invention. The embodiment can be applied to the condition of carrying out auxiliary decision on the power protection of the important load of the power system. As shown in fig. 5, the power system load power protection control system specifically includes:
an element model building module 510 for building an element model of the power system;
a risk indicator determination module 520, configured to determine risk indicators of various fault states in the power system according to the element models and the operational reliability indicators;
and the control strategy determination module 530 is configured to determine a power protection control strategy for the load of the power system according to the operational reliability index, the risk index, and the risk degree of the cascading failure.
The power system load power protection control system provided by the embodiment of the invention can execute the power system load power protection control method provided by any embodiment of the invention, has corresponding functional modules and beneficial effects of the execution method, and is not repeated here.
Fig. 6 is a schematic block diagram of another power system load protection control system according to an embodiment of the present invention. The power system load power protection control system provided by the embodiment of the invention can execute the power system load power protection control method provided by the above embodiment of the invention. As shown in fig. 6, the power system load power protection control system includes: infrastructure layer 1, operating system layer 2, data bus layer 3 and public service layer, the public service layer includes: the system comprises an application service 4, a man-machine service 7, a data service 9, a management service 10 and a special security isolation device 11, wherein the application service 4 comprises a risk assessment application 5, the man-machine service 7 comprises a man-machine application 6, and the data service 9 comprises a data application 8.
Specifically, as shown in fig. 6, the infrastructure layer 1 may include various elements in the power system, and the operating system layer 2 can collect data of the infrastructure layer 1, control the infrastructure layer 1, and transmit various types of data in the infrastructure layer 1 to the public service layer through the data bus layer 3. The staff can risk-assess various fault conditions in the power system through the risk assessment application 5 in the application service 4 and manage the power system through the management service 10. The dedicated security isolation device 11 may be a firewall or security isolation device as needed to protect the system. Illustratively, in conjunction with fig. 5 and 6, the element model building module 510, the risk indicator determining module 520, and the control strategy determining module 530 may all be disposed at the operating system layer 2.
The staff, the power grid or the user can acquire power grid data through the data application 8 in the data service 9, human-computer interaction is realized through the human-computer service 7 including the human-computer application 6, for example, the data of the intelligent electric meter is acquired through the human-computer application 6, time-of-use electricity price and dynamic real-time electricity price are realized, the user can select electricity utilization time periods through the human-computer application 6, and the contribution is made to reducing peak load of the power grid while electricity charges are saved; and for example, allow and create conditions for users with distributed power sources (including electric vehicles) to deliver power to the grid during peak demand. The technical scheme of this embodiment is favorable to carrying out visual management to distribution network and equipment to can support the electric wire netting and user's interdynamic, help realizing the informationization of distribution management and power consumption management.
Fig. 7 is a schematic block diagram of another power system load protection control system according to an embodiment of the present invention. The power system load power protection control system provided by the embodiment of the invention can execute the power system load power protection control method provided by the above embodiment of the invention. As shown in fig. 7, the power system load protection control system includes: the system comprises a communication workstation 12, a SCADA system main station 13, a first switch 14, a second switch 15, an installation isolation device 16, a first firewall 17, a maintenance workstation 18, an online risk assessment data server 19, an online risk assessment calculation server 20, a first calculation workstation 21, a second calculation workstation 22, an online risk assessment network server 23, a second firewall 24 and a third switch 25. Specifically, the SCADA system master 13 may perform data acquisition and monitoring on the power system, and the communication workstation 12 and the SCADA system master 13 of the power system may send data to the maintenance workstation through the first switch 14 and the second switch 15. The installation isolation device 16 and the first firewall 17 can perform the functions of isolating the communication workstation side from the maintenance workstation side and protecting the network. The maintenance workstation 18 can maintain the power system based on various received data of the power system, the first computing workstation 21 and the second computing workstation 22 can calculate and evaluate various reliability parameters and risk indexes based on various received data of the power system, and different online risk data are respectively stored in three different servers, namely an online risk assessment data server 19, an online risk assessment computing server 20 and an online risk assessment network server 23, so as to improve the service performance of the maintenance workstation. The maintenance workstation 18, the first computing workstation 21 and the second computing workstation 22 can transmit data to the communication workstation side through the third switch 25, and the second firewall 24 can isolate the external network to protect the maintenance workstation side. The technical scheme of this embodiment is favorable to carrying out visual management to distribution network and equipment thereof, helps realizing the informationization of distribution management and power consumption management.
EXAMPLE five
Fig. 8 is a schematic structural diagram of an apparatus provided in an embodiment of the present invention. FIG. 8 illustrates a block diagram of an exemplary device 812 suitable for use in implementing embodiments of the present invention. The device 812 shown in fig. 8 is only an example and should not bring any limitations to the functionality or scope of use of embodiments of the present invention.
As shown in fig. 8, device 812 is in the form of a general purpose device. Components of device 812 may include, but are not limited to: one or more processors 816, a memory device 828, and a bus 818 that couples various system components including the memory device 828 and the processors 816.
Bus 818 represents one or more of any of several types of bus structures, including a memory device bus or memory device controller, a peripheral bus, an accelerated graphics port, and a processor or local bus using any of a variety of bus architectures. By way of example, such architectures include, but are not limited to, Industry Standard Architecture (ISA) bus, Micro Channel Architecture (MAC) bus, enhanced ISA bus, Video Electronics Standards Association (VESA) local bus, and Peripheral Component Interconnect (PCI) bus.
Device 812 typically includes a variety of computer system readable media. Such media can be any available media that is accessible by device 812 and includes both volatile and nonvolatile media, removable and non-removable media.
Storage 828 may include computer system readable media in the form of volatile Memory, such as Random Access Memory (RAM) 830 and/or cache Memory 832. Device 812 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 838 may be used to read from and write to non-removable, nonvolatile magnetic media (not shown in FIG. 8 and commonly referred to as a "hard drive"). Although not shown in FIG. 8, a magnetic disk drive for reading from and writing to a removable, nonvolatile magnetic disk (e.g., a "floppy disk") and an optical disk drive for reading from or writing to a removable, nonvolatile optical disk such as a Compact disk Read-Only Memory (CD-ROM), Digital Video disk Read-Only Memory (DVD-ROM) or other optical media may be provided. In these cases, each drive may be connected to the bus 818 by one or more data media interfaces. Storage 828 may include at least one program product having a set (e.g., at least one) of program modules that are configured to carry out the functions of embodiments of the invention.
A program/utility 880 having a set (at least one) of program modules 882, which may include but is not limited to an operating system, one or more application programs, other program modules, and program data, each of which or some combination of which may include an implementation of a network environment, may be stored in, for example, the storage 828. Program modules 882 generally perform the functions and/or methodologies of the described embodiments of the invention.
Device 812 may also communicate with one or more external devices 811 (e.g., keyboard, pointing terminal, display 810, etc.), with one or more terminals that enable a user to interact with device 812, and/or with any terminals (e.g., network card, modem, etc.) that enable device 812 to communicate with one or more other computing terminals. Such communication may occur via input/output (I/O) interfaces 822. Further, the device 812 may also communicate with one or more networks (e.g., a Local Area Network (LAN), Wide Area Network (WAN), and/or a public Network, such as the internet) via the Network adapter 820. As shown in FIG. 8, the network adapter 820 communicates with the other modules of the device 812 over the bus 818. It should be appreciated that although not shown, other hardware and/or software modules may be used in conjunction with device 812, including but not limited to: microcode, end drives, Redundant processors, external disk drive Arrays, RAID (Redundant Arrays of Independent Disks) systems, tape drives, and data backup storage systems, among others.
The processor 816 executes various functional applications and data processing by executing programs stored in the storage device 828, for example, implementing a power system load protection control method provided by an embodiment of the present invention, the method including:
establishing an element model of the power system;
determining risk indexes of various fault states in the power system according to the element models and the operation reliability indexes;
and determining a load power protection control strategy of the power system by combining the operation reliability index, the risk index and the risk degree of the cascading failure.
EXAMPLE six
An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements a power system load protection control method provided in an embodiment of the present invention, where the method includes:
establishing an element model of the power system;
determining risk indexes of various fault states in the power system according to the element models and the operation reliability indexes;
and determining a load power protection control strategy of the power system by combining the operation reliability index, the risk index and the risk degree of the cascading failure.
Computer storage media for embodiments of the invention may employ any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or terminal. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. A power system load power protection control method is characterized by comprising the following steps:
establishing an element model of the power system;
determining risk indexes of various fault states in the power system according to the element models and the operation reliability indexes;
and determining a load power protection control strategy of the power system by combining the operation reliability index, the risk index and the risk degree of the cascading failure.
2. The power system load power protection control method according to claim 1, wherein establishing a model of an element of the power system comprises:
acquiring real-time operation information of the power system, and calculating operation reliability parameters;
and establishing an element model of the power system according to the real-time operation information and the operation reliability parameters.
3. The power system load power protection control method according to claim 2, wherein determining risk indicators of various fault states in the power system according to the component models and the operational reliability indicators comprises:
determining probabilities and risk consequences of various instantaneous fault states in the power system;
and calculating the risk index according to the risk consequence of the fault state, and sequencing the fault state according to the probability of the fault state.
4. The power system load power conservation control method of claim 3 wherein determining the probability and risk consequences of various transient fault conditions in the power system comprises:
determining various instantaneous fault states in the power system by adopting a minimum path and/or minimum cut algorithm based on an element model of the power system, and calculating the probability of the fault states;
assessing risk consequences of the fault condition.
5. The power system load power protection control method according to claim 1, wherein the operational reliability index includes a power supply capacity of a main line in the power system, and the cascading failure includes a branch line failure in the power system;
and determining a power protection control strategy of the load of the power system by combining the operation reliability index, the risk index and the risk degree of the cascading failure, wherein the power protection control strategy comprises the following steps:
when a branch line in the power system fails, determining the power supply capacity of a main line in the power system;
determining electricity limiting electric quantity and electricity limiting load according to the total power supply load of the power system and the power supply capacity of the main line;
and limiting the electricity based on the electricity limiting electric quantity and the electricity limiting load, and recovering power supply for the failed branch line.
6. The power system load power protection control method according to claim 5, wherein determining the power supply capacity of the main line in the power system when the branch line in the power system fails comprises:
when the failed branch line supplies power to the single-side power supply, judging whether the failed branch line is out of loop or not according to the positive power supply direction of the main line in the power system;
if the failed branch line is not looped or the failed branch line is connected with a power supply, determining the power supply capacity of the main line in the power system according to the tide data;
and if the failed branch line is out of loop and is not connected with the power supply, searching the main line and determining the power supply capacity of the main line.
7. The power system load power conservation control method according to claim 6, wherein determining the power limiting capacity and the power limiting load according to a total power supply load of the power system and a power supply capacity of the main line comprises:
judging whether the total power supply load of the power system is larger than the power supply capacity of the main line or not;
and if the total power supply load is greater than the power supply capacity of the main line, determining the power limiting electric quantity according to the total power supply load and the power supply capacity of the main line, and determining the power limiting load according to the structure of the power system and according to at least one of a nearby principle, a maximum power supply conversion principle, a highest reliability principle and a manual designation principle.
8. A power system load power protection control system, comprising:
the component model establishing module is used for establishing a component model of the power system;
the risk index determining module is used for determining risk indexes of various fault states in the power system according to the element models and the operation reliability indexes;
and the control strategy determination module is used for determining a load power protection control strategy of the power system by combining the operation reliability index, the risk index and the risk degree of the cascading failure.
9. An apparatus, characterized in that the apparatus comprises:
one or more processors;
storage means for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the power system load conserving control method of any of claims 1-7.
10. A computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements the power system load protection control method according to any one of claims 1 to 7.
CN202010200737.3A 2020-03-20 2020-03-20 Power system load power protection control method, system, equipment and storage medium Pending CN111369172A (en)

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