CN110728471A - Power grid dispatching operation safety accident grade determining method and risk index calculating method - Google Patents
Power grid dispatching operation safety accident grade determining method and risk index calculating method Download PDFInfo
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Abstract
The invention discloses a power grid dispatching operation safety accident grade determining method and a risk index calculating method, wherein the determining method comprises the following steps: collecting calculation data of each stage of power grid dispatching operation; performing safety and stability simulation calculation of each stage of power grid dispatching operation according to the calculation data; according to the simulation calculation result, the load loss amount, the corresponding loss load equipment and the plant station to which the equipment belongs are counted; calculating the power grid load reduction and supply proportion, the user power failure proportion and the number of stations of a voltage loss plant caused by power safety accidents in a preset power grid range; and determining the safety accident grade according to the load reduction and supply proportion of the power grid, the power failure proportion of users and the number of stations of the pressure loss plant. The invention realizes the online evaluation of the safety risk of the power grid dispatching operation, lays a technical foundation for the pre-warning and pre-control of the power grid dispatching operation, prevents the potential safety hazard possibly brought by the dispatching operation and ensures the safe and stable operation of the power grid.
Description
Technical Field
The invention relates to a power grid dispatching operation safety accident grade determining method and a risk index calculating method, and belongs to the technical field of power grid dispatching.
Background
The power system scheduling operation is a basic means for adjusting the operation mode of a power grid and handling power grid abnormity and accidents, and how to ensure the operation safety is a problem which must be dealt with in the daily work of power grid scheduling. Along with the continuous expansion of the scale of the power grid, the connection between the power grids is close, and the influence of improper scheduling operation on the safety and stability of the system can be expanded; meanwhile, higher requirements are provided for the operation capability of a dispatcher under various complex working conditions and the quick response capability of the dispatcher under an accident state. The existing operation ticket system generally takes switching operation anti-error check and trend analysis as main parts, the safe and stable state and influence of an operated power grid are mainly judged by subjective experience of operators, and the technical problems of high error rate, low working efficiency, untimely risk avoidance and the like exist.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a power grid dispatching operation safety accident grade determining method and a risk index calculating method, which can intuitively give a possibly caused safety operation risk grade so that a dispatcher can effectively avoid the influence of high-risk grade operation on a system.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
in a first aspect, the invention provides a method for determining a level of a safety accident in power grid dispatching operation, where the method includes the following steps:
collecting calculation data of each stage of power grid dispatching operation;
performing safety and stability simulation calculation of each stage of power grid dispatching operation according to the calculation data;
according to the simulation calculation result, the load loss amount, the corresponding loss load equipment and the plant station to which the equipment belongs are counted;
calculating the power grid load reduction and supply proportion, the user power failure proportion and the number of stations of a voltage loss plant caused by power safety accidents in a preset power grid range;
and determining the safety accident grade according to the load reduction and supply proportion of the power grid, the power failure proportion of users and the number of stations of the pressure loss plant.
With reference to the first aspect, further, the calculating data includes:
the method comprises the steps of obtaining the current operation mode of the power grid, the static dynamic model parameters of elements, the operation information of the power grid, the control strategies of a second defense line and a third defense line and the action condition of the safety control device after expected faults according to the control strategies.
With reference to the first aspect, further, the method for performing safety and stability simulation calculation on each stage of power grid dispatching operation includes the following steps:
performing time domain simulation calculation of expected faults according to the acquired calculation data of each stage of the power grid dispatching operation;
and in the time domain simulation calculation, the action of a second defensive line feedback type safety control device, the action of a third defensive line low-frequency low-voltage load shedding device and the action of a power grid disconnection device are taken into consideration, the system disconnection condition directly caused by the expected fault is obtained through a topology analysis method, and whether the power grid scheduling operation triggers the action of the safety control system or not and whether the safety and stability problem exists in the power grid after the power grid scheduling operation is judged.
With reference to the first aspect, further, the method for counting load loss, corresponding load loss devices, and plant stations to which the devices belong includes:
according to the system disconnection condition directly caused by the expected fault, the load loss amount directly caused by the fault, the corresponding load equipment and the plant station to which the equipment belongs are counted;
according to the action condition of the second line-defense feedback type safety control device, counting corresponding load loss, corresponding load equipment and a station to which the equipment belongs;
and according to the action conditions of the third line-of-defense low-frequency low-voltage load shedding device and the power grid splitting device, counting corresponding load loss, corresponding load equipment and a station to which the equipment belongs.
With reference to the first aspect, further, for a system disconnection condition directly caused by an expected fault and a system disconnection condition caused by a third wire-defense power grid disconnection device, statistics is performed on the power generation load before the sub-island fault: if any one of the conditions that no generator exists in the sub-island, the sub-island generates electricity and does not reach the total generation amount threshold and the sub-island loads do not reach the total load amount threshold exists, the sub-island is considered to not meet the operation condition, and the sub-island loads which do not meet the operation condition are counted into the total fault load loss amount.
With reference to the first aspect, further, the grid supply-reduction load ratio is calculated and obtained by using the following formula:
wherein p is the load reduction and supply proportion of the power grid, ltFor faults directly causing total loss of load,/cFor total load shedding after a fault, /)allThe load statistics is the total load of the system before the fault, and the load statistics is specific to the preset power grid range.
With reference to the first aspect, further, the method for determining the safety accident level includes the following steps:
obtaining threshold values according to power grid load levels and regionality specified in power safety accident emergency handling and investigation regulations and power accident incident investigation regulations of southern Power grid, China;
and comparing the power grid load reduction and supply proportion, the user power failure proportion and the number of stations of the voltage-loss plant with threshold values specified in power safety accident emergency handling and investigation treatment regulations and power accident investigation regulations of the power grid Limited liability company in southern China to determine the safety accident grade.
In a second aspect, an embodiment of the present invention provides a power grid scheduling operation risk indicator calculation method, where the calculation method includes the following steps:
if the power grid dispatching operation can trigger the action of the security control system, the risk index is-100;
if the power grid dispatching operation cannot trigger the action of the safety control system, but the power grid has the safety stability problem after the power grid dispatching operation, directly taking the minimum margin in quantitative evaluation of various safety stabilities as a risk index;
if the power grid dispatching operation cannot trigger the action of the safety control system, and the power grid does not have the safety stability problem after the power grid dispatching operation, determining the safety accident grade by adopting the method of any one of the above steps, and calculating the risk index according to the most serious safety accident grade, the total number of the safety accident grades and the minimum margin in quantitative evaluation of various safety stabilities.
In combination with the second aspect, further, for a situation that the power grid scheduling operation does not trigger the action of the safety control system, and the power grid does not have a safety and stability problem after the power grid scheduling operation, the risk indicator is calculated and obtained by using the following formula:
wherein the content of the first and second substances,
scheduling operation risk indexes for the power grid; etaminQuantifying a minimum margin in the evaluation for various safety stabilities; lambda [ alpha ]minThe most serious expected fault accident event under the condition that the minimum margin in quantitative evaluation of various safety stabilities is greater than 0Grade; and N is the total number of safety accident grades.
Compared with the prior art, the power grid dispatching operation safety accident grade determining method and the risk index calculating method provided by the embodiment of the invention have the following beneficial effects that:
the calculation data of each stage of the power grid dispatching operation judges whether the operation can trigger the action of a security control system, whether the power grid has the safety and stability problem after the operation and the safety accident level of the power grid under the expected fault, and gives the risk level of the operation, so that the online evaluation of the safety risk of the power grid dispatching operation is realized, a technical basis is laid for the early warning and pre-control of the power grid dispatching operation in advance, the potential safety hazard possibly brought by the dispatching operation is prevented, and the safe and stable operation of the power grid is ensured.
Drawings
Fig. 1 is a flowchart of a method for calculating a risk indicator of power grid scheduling operation according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, step 1 describes calculation data generation before and after the power grid dispatching operation: forming calculation data based on a current operation mode of a power grid, static and dynamic model parameters of elements, power grid operation information and control strategies of a second defense line and a third defense line, which are provided by EMS, taking a manually-specified fault set and an automatically-generated fault related to operation equipment as an expected fault set, and obtaining the action condition of the safety control device after the expected fault in the current operation mode according to the control strategies;
step 2 describes the operation of safety and stability simulation calculation at each stage: performing time domain simulation calculation of expected faults according to the acquired calculation data of each stage of operation, taking second defense line feedback type safety control device action, third defense line low-frequency low-voltage load shedding device action and power grid disconnection device action into account in the time domain simulation calculation, obtaining system disconnection conditions directly caused by faults through a topology analysis method, and judging whether the operation can trigger the safety control system action and whether the power grid has safety and stability problems after the operation;
step 3 describes the statistical analysis of the load loss results: on the basis of the simulation calculation result of the expected fault, the load loss amount and the corresponding load equipment which are directly caused by the fault are counted according to the system disconnection condition which is directly caused by the fault; according to the action condition of the safety control device, counting corresponding load loss and corresponding load equipment; according to the action conditions of the third defense line low-frequency low-voltage load shedding device and the power grid splitting device, corresponding load loss and corresponding load equipment are counted; according to the load loss, the loss load equipment and the station to which the equipment belongs, calculating the load reduction and supply proportion of the power grid, the power failure proportion of a power supply user and the number of voltage-loss stations of different voltage classes caused by power safety accidents in a preset power grid range;
the statistical method of the load loss amount when the system is disconnected caused by the failure directly and the third line-of-defense disconnection device is as follows: and counting the power generation load before the sub-island fails, if one of no power generator in the sub-island, the power generation total amount threshold of the sub-island and the load total amount threshold of the sub-island does not reach, considering that the sub-island does not meet the operation condition, and counting the load of the unsafe sub-island into the total amount of the fault and the load loss.
The calculation method of the load reduction and supply proportion is as follows:
wherein p is the reduction/supply load ratio, ltFor faults directly causing total loss of load,/cFor total load shedding after a fault, /)allThe load statistics is the total load of the system before the fault, and the load statistics is specific to the preset power grid range.
The statistical method of the power failure proportion and the number of the stations of the voltage loss plant of the power supply users is as follows:
and acquiring corresponding user information from the expected failure loss load equipment, counting the number of lost users, and calculating the power failure proportion of the power supply users. And if all the users of a certain station are loss load users, the station is a no-voltage station, and the station number of 500kV no-voltage stations, the station number of 220kV no-voltage stations, the station number of 110kV no-voltage stations and the station number of 35kV no-voltage stations under expected faults are respectively counted.
Step 4 in fig. 1 describes the scheduling operation risk indicator calculation method:
(1) if the operation triggers the action of the security control system, the risk index is-100;
(2) if the operation does not trigger the action of the safety control system, but the safety stability problem of the power grid exists after the operation, directly taking the minimum margin in quantitative evaluation of various safety stabilities as a risk degree index;
(3) and if the power grid does not have the safety stability problem after operation, judging the safety accident grade according to the loss load equipment under the fault and the station to which the equipment belongs, and taking the product of the event grade divided by the grade quantity and the minimum safety stability margin as a risk index.
The formula for correspondingly calculating the scheduling operation risk index is as follows:
wherein the content of the first and second substances,
for scheduling operational risk indicators, ηminFor checking the minimum margin, lambda, in quantitative evaluation of various safety stabilities after operationminAnd N is the total number of the accident event grades determined according to the regulations.
The safety accident grade is that according to loss load equipment and a station to which the equipment belongs, a threshold value is obtained according to a power grid load grade and regionality specified in power safety accident emergency handling and investigation regulations and power accident investigation regulations of southern China Power grid Limited liability company; comparing the load reduction and supply proportion, the power failure proportion of power supply users and the number of stations of a voltage loss plant with threshold values specified in power safety accident emergency handling and investigation treatment regulations and power accident investigation regulations of southern China Power grid Limited liability company, determining the safety accident grade, and determining the importance grade of the fault equipment according to the safety accident grade; and traversing all the expected faults, outputting the expected faults and fault equipment thereof with the accident risk level not meeting the requirements, giving an alarm, and dividing the most serious safety accident level by the level number for calculating the operation risk index.
The embodiment of the invention is based on the online data of the power grid before and after the dispatching operation and the control strategies of the second and third defense lines, and the risk level of the operation is given by judging whether the operation triggers the action of the security control system, whether the power grid has the safety and stability problems after the operation and the safety accident level of the power grid under the expected fault, thereby realizing the online evaluation of the safety risk of the dispatching operation of the power grid, laying a technical foundation for the early warning and the pre-control of the dispatching operation of the power grid, preventing the potential safety hazard possibly brought by the dispatching operation and ensuring the safe and stable operation of the power grid.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A power grid dispatching operation safety accident grade determining method is characterized by comprising the following steps:
collecting calculation data of each stage of power grid dispatching operation;
performing safety and stability simulation calculation of each stage of power grid dispatching operation according to the calculation data;
according to the simulation calculation result, the load loss amount, the corresponding loss load equipment and the plant station to which the equipment belongs are counted;
calculating the power grid load reduction and supply proportion, the user power failure proportion and the number of stations of a voltage loss plant caused by power safety accidents in a preset power grid range;
and determining the safety accident grade according to the load reduction and supply proportion of the power grid, the power failure proportion of users and the number of stations of the pressure loss plant.
2. The grid dispatching operation safety incident level determination method according to claim 1, wherein the calculating data comprises:
the method comprises the steps of obtaining the current operation mode of the power grid, the static dynamic model parameters of elements, the operation information of the power grid, the control strategies of a second defense line and a third defense line and the action condition of the safety control device after expected faults according to the control strategies.
3. The method for determining the safety accident level of the power grid dispatching operation according to claim 1, wherein the method for performing safety and stability simulation calculation on each stage of the power grid dispatching operation comprises the following steps:
performing time domain simulation calculation of expected faults according to the acquired calculation data of each stage of the power grid dispatching operation;
and in the time domain simulation calculation, the action of a second defensive line feedback type safety control device, the action of a third defensive line low-frequency low-voltage load shedding device and the action of a power grid disconnection device are taken into consideration, the system disconnection condition directly caused by the expected fault is obtained through a topology analysis method, and whether the power grid scheduling operation triggers the action of the safety control system or not and whether the safety and stability problem exists in the power grid after the power grid scheduling operation is judged.
4. The method for determining the safety accident level of the power grid dispatching operation according to claim 1, wherein the method for counting the load loss amount, the corresponding loss load equipment and the plant station to which the equipment belongs comprises the following steps:
according to the system disconnection condition directly caused by the expected fault, the load loss amount directly caused by the fault, the corresponding load equipment and the plant station to which the equipment belongs are counted;
according to the action condition of the second line-defense feedback type safety control device, counting corresponding load loss, corresponding load equipment and a station to which the equipment belongs;
and according to the action conditions of the third line-of-defense low-frequency low-voltage load shedding device and the power grid splitting device, counting corresponding load loss, corresponding load equipment and a station to which the equipment belongs.
5. The method for determining the safety accident level of the power grid dispatching operation according to claim 4, wherein for the system splitting condition directly caused by the expected fault and the system splitting condition caused by the third wire-defense power grid splitting device, the power generation load before the sub-island fault is counted: if any one of the conditions that no generator exists in the sub-island, the sub-island generates electricity and does not reach the total generation amount threshold and the sub-island loads do not reach the total load amount threshold exists, the sub-island is considered to not meet the operation condition, and the sub-island loads which do not meet the operation condition are counted into the total fault load loss amount.
6. The method for determining the safety accident level of the power grid dispatching operation according to claim 1, wherein the power grid load reduction and supply proportion is calculated and obtained by adopting the following formula:
wherein p is the load reduction and supply proportion of the power grid, ltFor faults directly causing total loss of load,/cFor total load shedding after a fault, /)allThe load statistics is the total load of the system before the fault, and the load statistics is specific to the preset power grid range.
7. The method for determining the safety accident level of the power grid dispatching operation according to claim 1, wherein the method for determining the safety accident level comprises the following steps:
obtaining threshold values according to power grid load levels and regionality specified in power safety accident emergency handling and investigation regulations and power accident incident investigation regulations of southern Power grid, China;
and comparing the power grid load reduction and supply proportion, the user power failure proportion and the number of stations of the voltage-loss plant with threshold values specified in power safety accident emergency handling and investigation treatment regulations and power accident investigation regulations of the power grid Limited liability company in southern China to determine the safety accident grade.
8. A power grid dispatching operation risk index calculation method is characterized by comprising the following steps:
if the power grid dispatching operation can trigger the action of the security control system, the risk index is-100;
if the power grid dispatching operation cannot trigger the action of the safety control system, but the power grid has the safety stability problem after the power grid dispatching operation, directly taking the minimum margin in quantitative evaluation of various safety stabilities as a risk index;
if the power grid dispatching operation cannot trigger the action of a safety control system, and the power grid has no safety stability problem after the power grid dispatching operation, determining the safety accident grade by adopting the method of any one of claims 1 to 7, and calculating the risk index according to the most serious safety accident grade, the total number of the safety accident grades and the minimum margin in quantitative evaluation of various safety stabilities.
9. The method for calculating the risk indicator of the power grid dispatching operation according to claim 8, wherein for the situation that the power grid dispatching operation does not trigger the action of a security control system and the power grid has no problem of safety and stability after the power grid dispatching operation, the risk indicator is calculated and obtained by adopting the following formula:
wherein the content of the first and second substances,
scheduling operation risk indexes for the power grid; etaminQuantifying a minimum margin in the evaluation for various safety stabilities; lambda [ alpha ]minThe level of the most serious expected fault accident event is determined when the minimum margin in quantitative evaluation of various safety stabilities is greater than 0; and N is the total number of safety accident grades.
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