CN102290811B - Method for evaluating accident prearranged plan and running way - Google Patents

Abstract

A method for evaluating the accident plan and operation mode, first draw the graph and topology of the grid equipment; through the grid topology and imported telemetry data, combined with the safety automatic device in the grid, simulate the failure of one or several equipment After load transfer, current limit, safety automatic device action, user power failure; in the case of dual power supply as far as possible, it can automatically judge whether the operation mode meets the requirements of power supply reliability and static stability; it can also target the specified The equipment intelligently generates accident plans corresponding to different maintenance methods. The invention can automatically generate the evaluation of the influence caused by the operation mode and equipment failure, and provide useful information for the decision-making of dispatching and formulating the operation mode and dispatching accident handling.

Description

Methods for evaluating accident plans and modes of operation

technical field

The invention relates to a method for evaluating accident plans and operation modes in the field of power grid equipment and the like.

Background technique

When the main equipment of the power grid is out of service and in a special operation mode, the dispatcher needs to arrange a reasonable operation mode according to the connection mode and load conditions, and make a corresponding accident plan, and analyze the possible impact and accident handling in advance of the accident. and judgment. Since the existing systems focus on real-time information, they cannot reflect the actions of related equipment safety automatic devices after a certain equipment is disconnected, and cannot display information such as power grid load transfer. SCADA (scheduling automation system) or PMS (power transmission and distribution production management system) system manually obtains the system topology and equipment load, and manually calculates the load of the corresponding equipment after load transfer to determine the best operation mode. The quality of this mode of operation depends entirely on the experience and sense of responsibility of the personnel operating the mode. When obtaining the equipment load, the dispatcher can also generate a series of equipment load tables according to certain conditions through the comprehensive query system of SCADA, but when inquiring about the specific equipment load, it needs to be searched manually. When important equipment is out of service, scheduling also needs to write an accident plan, which is traditionally written manually, which is slow and may contain errors and omissions.

In addition, the advanced applications in the current dispatching SCADA system, such as the PAS system, can perform power flow calculation and safety verification of the interconnected power grid for equipment with a voltage level of 220 kV and above; however, for terminal power grids with a voltage level below 220 kV The equipment is not applicable, and the influence of equipment such as safety automatic devices on power flow transfer is not considered, and at the same time, it does not have practical functions such as intelligent generation of accident plans, which has great limitations.

Contents of the invention

The purpose of the present invention is to provide a method for evaluating the accident plan and operation mode. By expanding the function of the automation system, the existing operation mode can be scientifically evaluated in terms of reliability, safety and stability analysis, etc., and the possible Assess the impact of load transfer, equipment overload, safety automatic device action, scope of influence, and users involved, and intelligently generate a dispatch accident plan.

In order to achieve the above object, the technical solution of the present invention is to provide a method for evaluating the accident plan and operation mode, which includes:

Step a. According to the imported equipment operation data and electrical quantity information, draw the graphics of each electrical equipment in the grid system, and generate the system topology according to the connection relationship of the graphics;

Step b. Simulate the action of the safety automatic device according to the action situation and action time of the equipment safety automatic device, and deduce the power flow distribution of the system after the load transfer;

Step c. Evaluate the operation mode of the system equipment in terms of reliability and static stability according to the equipment operation status set in the drawn graph by the scheduler and the given system topology;

Step d. For different fault tripping devices, according to the given power flow and load information of the device, and the imported electrical quantity information collected by other systems, generate accident plans corresponding to different maintenance methods.

In step a, the data information of the system equipment required for drawing graphics and topological structures is to schedule the operating parameters of the manually imported electrical equipment;

Or, through real-time interconnection with the external dispatching automation system SCADA or power transmission and distribution production management system PMS, to obtain the data information of the required system equipment; the dispatching automation system SCADA provides the electrical quantity and operating state quantity information of the equipment , the graph information and topology information of the system are provided by the power transmission and distribution production management system PMS.

In step b, the judgment logic for the device status is as follows:

Step b1. In the normal operation mode of the system, set the equipment to always be in the running state; regardless of whether the equipment has a self-cutting device, set the equipment to the power-off state when scheduling and setting the operation mode, and set it to faulty equipment;

Step b2. Set the highest-level power grid equipment to be in normal operation. In the terminal network, if the lower-level equipment does not have a self-cutting device, the operating status of the lower-level equipment is the same as that of the upper-level equipment. When the equipment is running, the lower-level equipment is running;

Step b3, in the terminal network, if a self-cutting device is set, then:

Step b3-1, when the upper-level equipment is running, then the lower-level equipment is running;

Step b3-2, if the upper level equipment is powered off, if the lower level equipment has a self-cutting device, and the tangential equipment is in the running state, then after a certain time delay, the self-cutting action will be applied, and the load carried by the lower level equipment will be added to the tangential equipment;

Step b3-3, if the upper-level equipment is powered off, if the lower-level equipment has a self-cutting device, and the tangential equipment is powered off, the self-cutting will not work;

Step b4, on the basis of the self-cutting action, if a coupling device is also provided, then judge the position of the lower-level equipment, and proceed further:

Step b4-1, if the lower-level equipment is on the second and third busbars, after a certain time delay, the load of the second and third busbars is superimposed on the first and fourth busbars to make the equipment run;

Step b4-2. If the lower-level equipment is on the first and fourth busbars, after a certain time delay, the load of the first and fourth busbars is superimposed on the second and third busbars, and after a certain time delay, The load of the second and third busbars is then connected to the first and fourth busbars to make the equipment run;

Step b5. When the self-cutting device of the upper and lower level equipment needs to have a fixed time value that cooperates with each other, use the program timer to simulate its self-cutting action time to make it consistent with the actual action; the scheduling can manually set the automatic switching time of the equipment. cut time.

In step c, the evaluation of the operation mode further includes:

Step c1, equipment power supply reliability assessment:

Retrieve the power supply paths of all equipment in the power grid. If any two or more equipment power supply paths overlap, it is considered that the two or more equipment are powered by a single power supply of electrical equipment at the overlapping position, which does not meet the reliability of power supply; Set the 220kV tie busbar as the highest level power point, if the top devices of different equipment power supply paths are different 220kV tie busbars, the equipment is considered to meet the reliability of power supply;

Step c2, equipment static stability assessment:

Retrieve the load and load rate of all equipment in the power grid. If the load rate of any equipment exceeds 80% and 100%, it will be listed in the list of heavy load equipment and overload equipment respectively; in the operation mode arrangement, the load rate of more than 80% will be Display the overloaded equipment; in the evaluation of the accident plan, that is, in the abnormal operation mode, only the overloaded equipment with a load rate exceeding 100% is listed;

Step c3. If the evaluation results of steps c1 and c2 do not meet the relevant requirements, after scheduling and adjusting the operation mode of the system, repeat the above steps c1 and c2 to conduct the evaluation again until the evaluation results meet the requirements of reliability and static stability, and the operation mode is completed setting.

In step d, according to the accident plans of different maintenance methods, the workflow for generating the accident plans is as follows:

Step d1, for the total shutdown accident plan, make statistics on the total shutdown equipment, load shedding and all possible reversed power paths;

Step d2. For the non-full shutdown accident plan, list the load and load rate comparison before and after the accident, the statistics of load removal, and the accident countermeasures, and classify the load of the main transformer in operation after the accident:

Step d2-1. If the main transformer is overloaded, search for the lines that can be dug out of the station, and list the loads that can be dug out of the lines; for the situation that the dugout of these lines will cause the overload of the lower substation, list the dug out loads Overload equipment and load rate are convenient for dispatching when the load is overturned, and the line to overturn the load is determined according to the actual situation;

Step d2-2. If the operating main transformer is not overloaded, retrieve the equipment name and load rate of the equipment overloaded by the self-cutting of the lower-level substation equipment, so as to facilitate dispatching to determine whether it is possible to return the load from the self-cutting out to the operating main transformer.

Compared with the prior art, the method for evaluating the accident plan and operation mode of the present invention has the advantages that: the present invention can draw the graph and topology of the power grid equipment, and automatically generate the impact on the operation mode and equipment failure. Evaluation, providing useful information for making decisions on operation mode and dispatching accident handling: through power grid topology and imported telemetry data, it can automatically judge whether the operation mode meets the requirements of power supply reliability and static stability; in the existing system topology Basically, combined with the safety automatic devices in the power grid, simulate the load transfer, current limit, safety automatic device action, and user power loss after one or several equipment failures, and in the case of dual power sources as much as possible, Provide reference opinions for load transfer, mode adjustment, etc., and intelligently generate accident plans for different maintenance methods, providing more concise, practical and effective means of handling dispatching accidents.

Description of drawings

Fig. 1 is a schematic diagram of the hardware structure of the method for evaluating accident plans and operating modes according to the present invention;

Fig. 2 is the working flowchart of equipment action deduction in the evaluation method of the present invention;

Fig. 3 is the working flow chart of operation mode evaluation in the evaluation method of the present invention;

Fig. 4 is a flowchart of the intelligent generation of accident plans in the evaluation method of the present invention.

Detailed ways

The specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.

The method for evaluating the accident plan and operation mode of the present invention can automatically judge whether the operation mode meets the requirements of power supply reliability and static stability through the topology structure of the power grid and imported telemetry data; Action situation and action time, simulate the action of safety automatic devices, and deduce the power flow distribution of the system after load transfer; in addition, intelligently generate accident plans for specified equipment, and can provide more information than manual accident plans, such as Load transfer direction, static stability evaluation of related equipment after load transfer, priority ranking, etc., the generation of accident plans is fast and accurate.

As shown in Figure 1, the hardware used in the evaluation method of the present invention adopts a server-client CS structure arrangement, and connects a server and multiple workstations included in the evaluation system through a local area network. The server mainly stores the system database, calls the database information through the workstation, and finally realizes the evaluation function on the computer installed with the client program. The workstation can also obtain relevant data information required for evaluation from a SCADA system (scheduling automation system) or a PMS system (power transmission and distribution production management system) connected to the local area network.

In the evaluation method of the present invention, step a is set, that is, the scheduling uses the preset electrical wiring graphic template to quickly draw and generate a large number of grid equipment graphics, and automatically generate the system topology according to the drawn graphic connection relationship. It can manually import external data, or realize real-time interconnection with PMS system and SCADA system through the reserved interface, and receive the topological structure and graphic information given by them.

The import of the external data requires scheduling to manually export the operating parameters of the selected electrical equipment from the scheduling automation system, such as equipment name, current, voltage, load, time, etc., and import them into the evaluation system in an EXCEL form. The evaluation system should be able to Automatically read time information and generate multiple time sections in the system for the dispatcher to select the required time point (such as peak time or trough time) when evaluating. For the SCADA system, the evaluation system needs to be able to receive various electrical quantities and operating state quantities of the equipment in the substation, and to realize the collection of equipment parameters in the Dongfang Electronics DF8002 SCADA system, such as current, load, voltage and other electrical quantity information. Realize data interconnection. For the PMS system, the evaluation system automatically generates the system topology and graphic interface by reading the CIM file of the PMS system (including the grid graphic information and topology information), and through the real-time transmission to achieve data interconnection.

Set up step b, which is to simulate the action of relay protection and safety automatic devices through the program timer according to the action conditions and time of different equipment relay protection and safety automatic devices. When any equipment fault in the power grid system is removed, it can be automatically deduced System operation mode and power flow distribution after equipment tripping and load transfer.

Compared with networks with a voltage level of 220 kV and above, the change of the power flow is more due to the power flow transfer of the multi-node network after a certain device is disconnected, which is generally calculated by the Newton-Raphson method or the PQ decomposition method; and the regional dispatching station In the face of the terminal power grid, the change of the power flow is mainly due to the transfer of loads between different devices due to the action of the safety automatic device, and the main calculation is arithmetic.

The load of the equipment mainly depends on the state of the equipment, that is, two states of operation or power failure. In the terminal network, the operating status of the equipment is related to the operating status of the superior power grid, the safety automatic devices (mainly self-cutting and coupled switching devices) installed on the equipment, and the operating status of the tangential equipment.

As shown in Figure 2, when the device action is deduced, the judgment logic for the device status is as follows:

In step b1, in the normal operation mode, the equipment state is always in the running state; when the equipment is artificially set to fail, no matter whether the equipment has a self-cutting device, the equipment is considered to be in a power failure state (equivalent to the equipment in the dispatching setting power outage in the specified operation mode, or set as faulty equipment when the accident plan is generated).

In step b2, set the highest-level power grid equipment to be in normal operation. In the terminal network, if self-cutting is not considered, the operating status of the lower-level equipment is the same as that of the upper-level equipment. , the lower-level equipment runs.

Step b3, in the terminal network, if self-cutting is considered, the operating status of the lower-level equipment is not only related to the operating status of the upper-level equipment, but also related to whether the device has self-cutting (or joint switching) and the running status of the tangential equipment :at this time,

Step b3-1, when the upper-level equipment is running, then the lower-level equipment is running;

Step b3-2, when the upper-level equipment is powered off, if the lower-level equipment has self-cutting, and the tangential equipment is in the running state, then after a certain period of time delay, the self-cutting action will be applied, and the load carried by the equipment is added to the tangential equipment;

Step b3-3, the upper-level equipment is powered off, if the lower-level equipment has self-cutting, and the tangential equipment is powered off, then the self-cutting does not work.

In step b4, on the basis of the self-cutting action, if the joint cutting is also considered, the equipment position is judged:

Step b4-1, if the lower-level equipment is on the second and third busbars, after a certain time delay, the load of the second and third busbars is superimposed on the first and fourth busbars to make the equipment run;

Step b4-2. If the lower-level equipment is on the first and fourth busbars, after a certain time delay, the load of the first and fourth busbars is superimposed on the second and third busbars, and after a certain time delay, The loads of the second and third section busbars are connected and cut to the first and fourth section busbars to make the equipment run.

Step b5. Since the upper and lower levels of self-cutting have different time settings, there is also a problem of coordination of different self-cutting. The evaluation system uses a program timer to simulate the self-cut action time, so that it can match the actual situation of the safety automatic device action. In addition, if the self-cutting time is changed, the scheduler can also manually set the device's self-cutting time.

Assuming step c, that is to automatically analyze the topology of the power grid system according to the operating status of the power grid system set in the graph by the dispatcher, evaluate the reliability of the system and the static stability of the equipment, etc., list all the equipment that does not meet the dual power supply requirements, and Classify and display the equipment with the equipment load rate exceeding 80% and 100%, which is convenient for dispatching to grasp the weak points of the power grid system under normal operation mode, and the equipment that still exists under the existing normal operation mode that does not meet the relevant requirements, so as to remind the dispatcher in time Improvements and tweaks.

When the scheduling does not change the system operation mode, that is, under the normal operation mode of the system, evaluate the equipment of the entire network; when the scheduling changes the system operation mode, that is, under the system maintenance mode or abnormal operation mode, the equipment that will change the power flow of the equipment Perform an assessment so that scheduling can focus on the impact of the changed part of the system. According to the evaluation results and adjustment methods of the system, after scheduling and adjusting the operation mode of the system, the system operation mode is evaluated again until the requirements of reliability and static stability can be met.

As shown in Figure 3, in step c, the following aspects are specifically evaluated:

Step c1, equipment power supply reliability: the system searches the power supply paths of all equipment in the grid, if any two or more equipment power supply paths overlap, it is considered that the two or more equipment are powered by a single power supply of electrical equipment at the overlapping position Power supply does not meet the reliability of power supply. Generally, the 220 kV tie bus is set as the uppermost power point. If the top equipment of different equipment power supply paths is a different 220 kV tie bus, the equipment is considered to meet the power supply reliability.

Step c2, equipment static stability assessment: the system searches the load and load rate of all equipment in the grid, and if the load rate of any equipment exceeds 80% and 100%, it will be listed in the list of heavy load equipment and overload equipment respectively. Generally, in the operation mode arrangement, it is necessary to display the heavy load, that is, the equipment with a load rate exceeding 80%, as a hot spot device under normal operation to remind the dispatcher to pay attention; but in the accident plan, due to the abnormal operation mode, Only overloaded equipment is listed, that is, electrical equipment with a load rate exceeding 100%.

In step c3, if the evaluation results of steps c1 and c2 do not meet the relevant requirements, the dispatcher can adjust the operation mode and then repeat the above steps c1 and c2 to perform the evaluation again until the evaluation results meet the relevant requirements, and the operation mode setting is completed.

Set up step d, that is, according to different fault tripping devices, different accident plans are generated based on the power flow and load information imported into the device or the electrical quantity information collected in real time from the SCADA or PMS system. For whether the equipment is overloaded due to equipment tripping, it can automatically analyze the path of the load turning over or turning back according to the topology, or the path of the substation power reverse transmission under the condition of the substation’s full stop, comprehensively considering the technical requirements such as static stability, and generating a targeted solution. Accident plan with high quality and practicability, and can dynamically modify the accident plan according to the imported load and different operation modes.

As shown in Figure 4, the accident plans for different maintenance methods are generally divided into non-full stop and full stop accident plans. The step d of the assessment of the accident plan specifically includes:

Step d1, for the total stop accident plan, the evaluation system makes statistics on the total stop equipment, load shedding and all possible reversed power paths.

Step d2, for the non-stop accident plan, the evaluation system can list the load and load rate comparison before and after the accident, the statistics of load removal, accident countermeasures, etc., and classify the load situation of the main transformer running after the accident.

Step d2-1, if the running main transformer is overloaded, the system can retrieve the lines outside the station and list the loads that can be dug out of the lines, and the system can also list the loads that can be dug out of the lines. The overloaded equipment and load ratio after being dug out are convenient for dispatching to weigh the pros and cons when the load is turned over, and to decide the line to be dug out of the load according to the actual situation.

Step d2-2, if the operating main transformer is not overloaded, the system can retrieve the equipment name and load rate of the equipment overloaded in the lower substation due to self-cutting, which is convenient for dispatching to determine whether it is possible to return the load from the self-cutting out to the operating main transformer .

To sum up, the present invention establishes a "dynamic" evaluation system to automatically generate evaluations on the impact of operating modes and equipment failures, providing useful information for making decisions about operating modes and dispatching accident handling. On the basis of the existing system topology, combined with the safety automatic devices in the power grid, simulate the load transfer, current limit, safety automatic device action, and user power loss after one or several equipment failures, and meet the requirements as much as possible In the case of dual power sources, it provides reference opinions for load transfer and mode adjustment, and intelligently generates accident plans for different maintenance methods, providing a more concise, practical and effective means of handling dispatching accidents. At the same time, the interface-based and modular graphic editing function of the invention is convenient for system definition and maintenance, and it is also a beneficial attempt for future intelligent scheduling.

Although the content of the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as limiting the present invention. Various modifications and alterations to the present invention will become apparent to those skilled in the art upon reading the above disclosure. Therefore, the protection scope of the present invention should be defined by the appended claims.

Claims (5)

1. A method for evaluating accident plans and operating modes, characterized in that it comprises: Step a. According to the imported equipment operation data and electrical quantity information, draw the graphics of each electrical equipment in the grid system, and generate the system topology according to the connection relationship of the graphics; Step b. Simulate the action of the safety automatic device according to the action situation and action time of the equipment safety automatic device, and deduce the power flow distribution of the system after the load transfer; Step c. Evaluate the operation mode of the system equipment in terms of reliability and static stability according to the equipment operation status set in the drawn graph by the scheduler and the system topology generated in step a; Step d. For different fault tripping devices, according to the given power flow and load information of the device, and the imported electrical quantity information collected by other systems, generate accident plans corresponding to different maintenance methods. 2. The method for assessing accident plans and operating modes as claimed in claim 1, characterized in that, In step a, the data information of the system equipment required for drawing graphics and topological structures is to schedule the operating parameters of the manually imported electrical equipment; Or, through real-time interconnection with the external dispatching automation system SCADA or power transmission and distribution production management system PMS, to obtain the data information of the required system equipment; the dispatching automation system SCADA provides the electrical quantity and operating state quantity information of the equipment , the graph information and topology information of the system are provided by the power transmission and distribution production management system PMS. 3. The method for assessing accident plans and operating modes as claimed in claim 2, characterized in that, In step b, the judgment logic for the device status is as follows: Step b1. In the normal operation mode of the system, set the equipment to always be in the running state; regardless of whether the equipment has a self-cutting device, set the equipment to the power-off state when scheduling and setting the operation mode, and set it to faulty equipment; Step b2. Set the highest-level power grid equipment to be in normal operation. In the terminal network, if the lower-level equipment does not have a self-cutting device, the operating status of the lower-level equipment is the same as that of the upper-level equipment. When the equipment is running, the lower-level equipment is running; Step b3, in the terminal network, if a self-cutting device is set, then: Step b3-1, when the upper-level equipment is running, then the lower-level equipment is running; Step b3-2, if the upper level equipment is powered off, if the lower level equipment has a self-cutting device, and the tangential equipment is in the running state, then after a certain time delay, the self-cutting action will be applied, and the load carried by the lower level equipment will be added to the tangential equipment; Step b3-3, if the upper-level equipment is powered off, if the lower-level equipment has a self-cutting device, and the tangential equipment is powered off, the self-cutting will not work; Step b4, on the basis of the self-cutting action, if a coupling device is also provided, then judge the position of the lower-level equipment, and proceed further: Step b4-1, if the lower-level equipment is on the second and third busbars, after a certain time delay, the load of the second and third busbars is superimposed on the first and fourth busbars to make the equipment run; Step b4-2. If the lower-level equipment is on the first and fourth busbars, after a certain time delay, the load of the first and fourth busbars is superimposed on the second and third busbars, and after a certain time delay, The load of the second and third busbars is then connected to the first and fourth busbars to make the equipment run; Step b5. When the self-cutting device of the upper and lower level equipment needs to have a fixed time value that cooperates with each other, use the program timer to simulate its self-cutting action time to make it consistent with the actual action; the scheduling can manually set the automatic switching time of the equipment. cut time. 4. The method for evaluating the accident plan and the mode of operation as claimed in claim 3, characterized in that, In step c, the evaluation of the operation mode further includes: Step c1, equipment power supply reliability assessment: Retrieve the power supply paths of all equipment in the power grid. If any two or more equipment power supply paths overlap, it is considered that the two or more equipment are powered by a single power supply of electrical equipment at the overlapping position, which does not meet the reliability of power supply; Set the 220kV tie busbar as the highest level power point, if the top devices of different equipment power supply paths are different 220kV tie busbars, the equipment is considered to meet the reliability of power supply; Step c2, equipment static stability assessment: Retrieve the load and load rate of all equipment in the power grid. If the load rate of any equipment exceeds 80% and 100%, it will be listed in the list of heavy load equipment and overload equipment respectively; in the operation mode arrangement, the load rate of more than 80% will be Display the overloaded equipment; in the evaluation of the accident plan, that is, in the abnormal operation mode, only the overloaded equipment with a load rate exceeding 100% is listed; Step c3. If the evaluation results of steps c1 and c2 do not meet the relevant requirements, after scheduling and adjusting the operation mode of the system, repeat the above steps c1 and c2 to conduct the evaluation again until the evaluation results meet the requirements of reliability and static stability, and the operation mode is completed setting. 5. The method for assessing accident plans and operating modes as claimed in claim 4, characterized in that, In step d, according to the accident plans of different maintenance methods, the workflow for generating the accident plans is as follows: Step d1, for the total shutdown accident plan, make statistics on the total shutdown equipment, load shedding and all possible reversed power paths; Step d2. For the non-full shutdown accident plan, list the load and load rate comparison before and after the accident, the statistics of load removal, and the accident countermeasures, and classify the load of the main transformer in operation after the accident: Step d2-1. If the main transformer is overloaded, search for the lines that can be dug out of the station, and list the loads that can be dug out of the lines; for the situation that the dugout of these lines will cause the overload of the lower substation, list the dug out loads Overload equipment and load rate are convenient for dispatching when the load is overturned, and the line to overturn the load is determined according to the actual situation; Step d2-2. If the operating main transformer is not overloaded, retrieve the equipment name and load rate of the equipment overloaded by the self-cutting of the lower-level substation equipment, so as to facilitate dispatching to determine whether it is possible to return the load from the self-cutting out to the operating main transformer.

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