An emergency dispatching method for distribution network

Abstract

The invention relates to the technical field of emergency dispatching of distribution networks, and discloses an emergency dispatching method for distribution networks, comprising the following steps: step one: real-time acquisition of operation data, power load data and power supply fault data of all power supply devices; step two: analysis of the maximum current value allowed to pass through the circuit of each power supply device, and generation of corresponding safe current carrying capacity; step three: setting a monitoring period of fixed duration, analyzing the change trend of current load and voltage load of each power supply device during the monitoring period, and generating corresponding current index and voltage index; step four: evaluating the fault frequency of each power supply device, generating a dispatching data group in real time, deeply analyzing the supply and demand relationship, and making the distribution operation more stable; step five: setting a current index threshold and a voltage index threshold within a fixed range, comprehensively evaluating the balance relationship between the operation of each power supply device and the power load in the distribution network, and selecting the optimal power supply device for emergency dispatching, so that the intelligent dispatching efficiency is high.

Description

Technical Field

[0001] The present invention relates to the technical field of emergency dispatching of distribution networks, and in particular to an emergency dispatching method for distribution networks. Background Art

[0002] Emergency dispatch of distribution network refers to the process of quickly restoring power supply, minimizing the time and scope of power outages, and ensuring safe and stable operation of the power grid through a series of pre-established measures and procedures when an emergency or abnormal situation occurs in the distribution network. Factors such as natural disasters, equipment failures, and human operational errors may lead to emergencies in the distribution network and affect the stability of power supply. Emergency dispatch includes multiple steps such as fault detection, assessment, isolation, and power restoration. Fault detection uses advanced intelligent sensors, drone inspections, etc. to monitor the distribution network 24 hours a day to detect potential hidden dangers in a timely manner. Once an abnormal situation is found, the emergency plan is immediately activated and professionals are organized to rush to the scene. According to the type, scope and degree of the fault, the impact of the fault on the safety, economic operation and reliability of power supply to users is assessed, and then based on the assessment results, a scientific and reasonable emergency dispatch plan is formulated, including measures such as fault isolation, load transfer, and backup power activation. Automatic or semi-automatic methods are used to quickly isolate the fault area to prevent the spread of the fault, minimize the time and scope of power outages, and organize professional technicians to carry out on-site repairs. During the power restoration phase, power supply to the damaged areas was restored in stages and orderly according to the principle of "main line first, branch line later, high voltage first, low voltage later", ensuring the safe and stable operation of the power grid and the reliability of power supply quality.

[0003] At present, the traditional emergency dispatch method for distribution networks mainly relies on real-time monitoring of the fluctuation trend of power load to determine whether an emergency dispatch plan needs to be formulated. This method cannot guarantee that all power supply equipment can stably meet the power supply demand when connected to the grid. Once the power supply equipment fails, the intelligent dispatch capability is insufficient, the dispatch decision process is long, and the efficiency of resource optimization allocation needs to be improved. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the shortcomings of the prior art, the present invention provides an emergency dispatch method for distribution networks, which has the advantages of in-depth analysis of supply and demand relationships, more stable distribution operation, and high intelligent dispatching efficiency. It solves the problem that traditional emergency dispatching methods for distribution networks cannot stably meet power supply needs and have insufficient intelligent dispatching capabilities.

[0006] (II) Technical solution

[0007] To achieve the above object, the present invention provides the following technical solution: an emergency dispatch method for a distribution network, comprising the following steps:

[0008] Step 1: Connect to the distribution network through the network to obtain the operation data, power load data and power supply fault data of all power supply equipment in real time, and classify the obtained data into operation data set, load data set and fault data set;

[0009] Step 2: Analyze the maximum current value allowed to pass through each power supply circuit based on the operating data set and generate the corresponding safe current carrying capacity ;

[0010] Step 3: Set a fixed-duration monitoring cycle , combined with the load data set, analyze the monitoring cycle The changing trend of current load and voltage load of each power supply equipment during the period generates the corresponding current index and voltage index ;

[0011] Step 4: Evaluate the failure frequency of each power supply device based on the failure data set , real-time analysis of the scheduling space of each power supply equipment during operation, and generation of corresponding scheduling data groups ;

[0012] Step 5: Set the current index threshold in a fixed range and voltage index threshold , combined with the safe current carrying capacity , Current Index and voltage index , comprehensively evaluate the balance between the operation of each power supply equipment in the distribution network and the power load, and according to the fault frequency and scheduling data group , select the best power supply equipment for emergency dispatch.

[0013] Preferably, in the step 1, They are the first, second, third, and The operating data of each power supply device includes rated power, rated voltage, rated power factor, output current and output voltage. Indicates the time point at which the operating data of a single power supply device is obtained.

[0014] Preferably, in the step 1, are the first, second, third, and The power load data of each power supply device includes the current load value and the voltage load value. Indicates the time point for obtaining the power load data of a single power supply device.

[0015] Preferably, in the step 1, They are the first, second, third, and The power supply failure data includes the faulty equipment, fault cause and repair method. Indicates the time point when a power supply failure occurs in the distribution network.

[0016] Preferably, in step 2, the safe current carrying capacity is The calculation process is as follows:

[0017] Extract the running data set The operating data of the power supply equipment is marked as ;

[0018] Will The rated power is marked as ,Will The rated voltage is marked as ,Will The power factor in ;

[0019]

[0020] In the formula, Indicates safe current carrying capacity. It represents the fixed constant in the safe current carrying capacity calculation formula, that is, the current limiting ratio. Indicates the conversion factor between phase current and line current, Indicates that in a three-phase circuit, the rated power, rated voltage, rated power factor and conversion coefficient are calculated to obtain the The maximum line current value in the power supply circuit, It represents the product of the current limiting ratio and the maximum line current value, that is, The safe current carrying capacity in the circuit of a power supply device.

[0021] Preferably, in step 3, the current index The calculation process is as follows:

[0022] Extract the load data set The power load data of the power supply equipment is marked as ;

[0023] exist Filter out monitoring cycles During the period The current load value of the power supply equipment is marked as , Respectively Power supply equipment at 1 minute, 2 minutes, and Current load value at minute;

[0024]

[0025]

[0026] In the formula, represents the current index, Indicates monitoring cycle During the period The sum of the current loads of the power supply equipment is divided by the duration to obtain the average current load value per minute. Indicates Power supply equipment in Current load value at minute, Indicates that according to the variance formula, the variance value calculated is the monitoring period During the period The current index of a power supply device.

[0027] Preferably, in step 3, the voltage index The calculation process is as follows:

[0028] exist Filter out monitoring cycles During the period The voltage load value of the power supply equipment is marked as , Respectively Power supply equipment at 1 minute, 2 minutes, and Voltage load value at minute;

[0029]

[0030]

[0031] In the formula, represents the voltage index, Indicates monitoring cycle During the period The sum of the voltage loads of the power supply equipment is divided by the duration to obtain the average voltage load value per minute. Indicates Power supply equipment in Voltage load value at minute, Indicates that according to the variance formula, the variance value calculated is the monitoring period During the period Voltage index of a power supply device.

[0032] Preferably, in step 4, the fault frequency The calculation process is as follows:

[0033] According to the fault data set, statistics The total number of failures of the power supply equipment is marked as ;

[0034] like When The time point at which the power supply device fails is marked as , , , , , Respectively Power supply equipment 1st, 2nd, and The time when the failure occurred;

[0035]

[0036] In the formula, Indicates the fault frequency, Indicates The first and second power supply equipment The time difference between failures, Indicates that the The total number of failures of the power supply equipment is divided by the time difference to obtain The failure frequency of each power supply device.

[0037] Preferably, in step 4, the scheduling data group The calculation formula is as follows:

[0038] Will The output current in ,Will The output voltage in ;

[0039]

[0040] In the formula, represents a scheduling data group, express At that time, The difference between the output current of a power supply device and the current load value, express At that time, The difference between the output voltage of the power supply equipment and the voltage load value, the scheduling data group includes the The current difference and voltage difference of the power supply equipment.

[0041] Preferably, in step 5, if the current load value of a single power supply device exceeds the safe current carrying capacity , Current Index Current index threshold exceeded or voltage index Voltage index threshold exceeded When the power supply equipment is running at a high speed, it indicates that the balance between the power supply equipment and the power load is out of balance, and the risk of equipment failure is high. , select the power supply equipment with sufficient scheduling space, and then combine the fault frequency , among the power supply equipment with sufficient scheduling space, select the fault frequency The lowest equipment is used as the optimal power supply equipment for emergency dispatch.

[0042] Compared with the prior art, the present invention provides an emergency dispatch method for a distribution network, which has the following beneficial effects:

[0043] The present invention obtains the operation data, power load data and power supply fault data of all power supply equipment in real time through the network connection distribution network, and classifies the acquired data into operation data set, load data set and fault data set. According to the operation data set, the maximum current value allowed to pass through the circuit of each power supply equipment is analyzed to generate the corresponding safe current carrying capacity. , safe current carrying capacity It is one of the criteria for evaluating the balance between the operation of each power supply device in the distribution network and the power load, and then setting a fixed-time monitoring cycle , analysis and monitoring cycle The changing trend of current load and voltage load of each power supply equipment during the period generates the corresponding current index and voltage index , evaluate the failure frequency of each power supply device , real-time analysis of the scheduling space of each power supply equipment during operation, and generation of corresponding scheduling data groups , clearly understand the stability of each power supply equipment, deeply analyze the supply and demand relationship, and make power distribution operation more stable.

[0044] The present invention sets a current index threshold within a fixed range. and voltage index threshold , combined with the safe current carrying capacity , Current Index and voltage index , comprehensively evaluate the balance between the operation of each power supply device in the distribution network and the power load. If the current load value of a single power supply device exceeds the safe current carrying capacity , Current Index Current index threshold exceeded or voltage index Voltage index threshold exceeded When the power supply equipment is running at a high speed, it indicates that the balance between the power supply equipment and the power load is out of balance, and the risk of equipment failure is high. , select the power supply equipment with sufficient scheduling space, and then combine the fault frequency , among the power supply equipment with sufficient scheduling space, select the fault frequency The lowest equipment is used as the optimal power supply equipment for emergency dispatch, and the intelligent dispatch has high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a step diagram of the method of the present invention. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] Since the traditional emergency dispatch method for distribution network mainly relies on real-time monitoring of the fluctuation trend of power load to determine whether an emergency dispatch plan needs to be formulated, this method cannot guarantee that all power supply equipment can stably meet the power supply demand when connected to the grid. Once the power supply equipment fails, the intelligent dispatching capability is insufficient, the dispatching decision process is long, and the efficiency of resource optimization allocation needs to be improved. Therefore, an emergency dispatch method for distribution network is provided. Please refer to Figure 1 , the method comprises the following steps:

[0048] Step 1: Connect to the distribution network through the network to obtain the operation data, power load data and power supply fault data of all power supply equipment in real time, and classify the acquired data into operation data set, load data set and fault data set. They are the first, second, third, and The operating data of each power supply device includes rated power, rated voltage, rated power factor, output current and output voltage. Indicates the time point for obtaining the operating data of a single power supply device, real-time monitoring of the operating status of the distribution network, and timely detection of abnormal situations to improve response speed. are the first, second, third, and The power load data of each power supply device includes the current load value and the voltage load value. Indicates the time point for obtaining the power load data of a single power supply device, real-time monitoring of the fluctuation trend of the power load, and ensuring the stability and reliability of power supply. They are the first, second, third, and The power supply failure data includes the faulty equipment, fault cause and repair method. Indicates the time point when power supply failure occurs in the distribution network. Analysis of historical data can predict potential failure points and failure risks, so as to take preventive measures in advance and reduce the possibility of power supply accidents.

[0049] Step 2: Analyze the maximum current value allowed to pass through each power supply circuit based on the operating data set and generate the corresponding safe current carrying capacity , the calculation process is as follows:

[0050] Extract the running data set The operating data of the power supply equipment is marked as ;

[0051] Will The rated power is marked as ,Will The rated voltage is marked as ,Will The power factor in ;

[0052]

[0053] In the formula, Indicates safe current carrying capacity. It represents the fixed constant in the safe current carrying capacity calculation formula, that is, the current limiting ratio. Indicates the conversion factor between phase current and line current, Indicates that in a three-phase circuit, the rated power, rated voltage, rated power factor and conversion coefficient are calculated to obtain the The maximum line current value in the power supply circuit, It represents the product of the current limiting ratio and the maximum line current value, that is, The safe current carrying capacity of each power supply equipment circuit is calculated according to the above formula. It is one of the criteria for evaluating the balance between the operation of each power supply equipment in the distribution network and the power load;

[0054] Step 3: Set a fixed-duration monitoring cycle , combined with the load data set, analyze the monitoring cycle The changing trend of current load and voltage load of each power supply equipment during the period generates the corresponding current index and voltage index , the calculation process is as follows:

[0055] Extract the load data set The power load data of the power supply equipment is marked as ;

[0056] exist Filter out monitoring cycles During the period The current load value of the power supply equipment is marked as , Respectively Power supply equipment at 1 minute, 2 minutes, and Current load value at minute;

[0057]

[0058]

[0059] In the formula, represents the current index, Indicates monitoring cycle During the period The sum of the current loads of the power supply equipment is divided by the duration to obtain the average current load value per minute. Indicates Power supply equipment in Current load value at minute, Indicates that according to the variance formula, the variance value calculated is the monitoring period During the period Current index of each power supply device;

[0060] exist Filter out monitoring cycles During the period The voltage load value of the power supply equipment is marked as , Respectively Power supply equipment at 1 minute, 2 minutes, and Voltage load value at minute;

[0061]

[0062]

[0063] In the formula, represents the voltage index, Indicates monitoring cycle During the period The sum of the voltage loads of the power supply equipment is divided by the duration to obtain the average voltage load value per minute. Indicates Power supply equipment in Voltage load value at minute, Indicates that according to the variance formula, the variance value calculated is the monitoring period During the period The voltage index of each power supply device. The change trend of the current load and voltage load of all power supply devices is calculated according to the above formula. The current index and voltage index It is helpful for the subsequent in-depth analysis of the supply and demand relationship between power supply equipment operation and power load;

[0064] Step 4: Evaluate the failure frequency of each power supply device based on the failure data set , the calculation process is as follows:

[0065] According to the fault data set, statistics The total number of failures of the power supply equipment is marked as ;

[0066] like When The time point at which the power supply device fails is marked as , , , , , Respectively Power supply equipment 1st, 2nd, and The time when the failure occurred;

[0067]

[0068] In the formula, Indicates the fault frequency, Indicates The first and second power supply equipment The time difference between failures, Indicates that the The total number of failures of the power supply equipment is divided by the time difference to obtain The fault frequency of the power supply equipment is , can clearly understand the stability of each power supply equipment;

[0069] Real-time analysis of the scheduling space of each power supply equipment during operation, generating corresponding scheduling data groups , and its calculation formula is as follows:

[0070] Will The output current in ,Will The output voltage in ;

[0071]

[0072] In the formula, represents a scheduling data group, express At that time, The difference between the output current of a power supply device and the current load value, express At that time, The difference between the output voltage of the power supply equipment and the voltage load value, the scheduling data group includes the The current difference and voltage difference of each power supply device. The larger the current difference, the larger the dispatching space and the more stable the power distribution operation.

[0073] Step 5: If the current load value of a single power supply device exceeds the safe current carrying capacity , Current Index Current index threshold exceeded or voltage index Voltage index threshold exceeded When the power supply equipment is running at a high speed, it indicates that the balance between the power supply equipment and the power load is out of balance, and the risk of equipment failure is high. , select the power supply equipment with sufficient scheduling space, and then combine the fault frequency , among the power supply equipment with sufficient scheduling space, select the fault frequency The lowest equipment is used as the optimal power supply equipment for emergency dispatch, and the intelligent dispatch has high efficiency.

[0074] Example 1: In this experiment, a generator with a rated power of 10000kW is selected as the experimental object. According to statistics, when the generator works at a rated voltage of 380V, the power factor is 0.8, the current limiting ratio of the distribution network for the generator is 0.9, and the safe current carrying capacity of the generator is The calculation formula is as follows:

[0075]

[0076] In the formula, Indicates safe current carrying capacity. It means that in a three-phase circuit, the maximum line current value in the generator circuit is calculated based on the rated power, rated voltage, rated power factor and conversion coefficient. It represents the product of the current limiting ratio and the maximum line current value, that is, the safe current carrying capacity in the generator circuit.

[0077] Example 2: In this experiment, a circuit breaker is selected as the experimental object. According to statistics, the current load values ​​of the circuit breaker within 5 minutes are 10kA, 14kA, 24kA, 21kA and 18kA respectively. The current index of the circuit breaker is The calculation formula is as follows:

[0078]

[0079]

[0080] In the formula, represents the current index, It means the sum of the current load of the circuit breaker within 5 minutes divided by the duration to get the average current load value per minute. According to the variance formula, the variance value is calculated. That is the current index of the circuit breaker within 5 minutes.

[0081] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An emergency dispatch method for a distribution network, characterized in that: The following steps are involved: Step 1: Connect to the distribution network through the network to obtain the operation data, power load data and power supply fault data of all power supply equipment in real time, and classify the obtained data into operation data set, load data set and fault data set; Step 2: Analyze the maximum current value allowed to pass through each power supply circuit based on the operating data set and generate the corresponding safe current carrying capacity ; Step 3: Set a fixed monitoring period , combined with the load data set, analyze the monitoring cycle The changing trend of current load and voltage load of each power supply equipment during the period generates the corresponding current index and voltage index ; Step 4: Evaluate the failure frequency of each power supply device based on the failure data set , real-time analysis of the scheduling space of each power supply equipment during operation, and generation of corresponding scheduling data groups ; Step 5: Set the current index threshold in a fixed range and voltage index threshold , combined with the safe current carrying capacity , Current Index and voltage index , comprehensively evaluate the balance between the operation of each power supply equipment in the distribution network and the power load, and according to the fault frequency and scheduling data group , select the best power supply equipment for emergency dispatch; If the current load value of a single power supply device exceeds the safe current carrying capacity , Current Index Current index threshold exceeded or voltage index Voltage index threshold exceeded When the power supply equipment is running at a high speed, it indicates that the balance between the power supply equipment and the power load is out of balance, and the risk of equipment failure is high. , select the power supply equipment with sufficient scheduling space, and then combine the fault frequency , among the power supply equipment with sufficient scheduling space, select the fault frequency The lowest equipment is used as the optimal power supply equipment for emergency dispatch.

2. The emergency dispatch method for distribution network according to claim 1, characterized in that: In the step 1, They are the first, second, third, and The operating data of each power supply device includes rated power, rated voltage, rated power factor, output current and output voltage. Indicates the time point at which the operating data of a single power supply device is obtained.

3. The emergency dispatch method for distribution network according to claim 2, characterized in that: In the step 1, are the first, second, third, and The power load data of each power supply device includes the current load value and the voltage load value. Indicates the time point for obtaining the power load data of a single power supply device.

4. The emergency dispatch method for distribution network according to claim 3, characterized in that: In the step 1, They are the first, second, third, and The power supply failure data includes the faulty equipment, fault cause and repair method. Indicates the time point when a power supply failure occurs in the distribution network.

5. The method for emergency dispatching of a distribution network according to claim 4, characterized in that: In step 2, the safe current carrying capacity The calculation process is as follows: Extract the running data set The operating data of the power supply equipment is marked as ; Will The rated power is marked as ,Will The rated voltage is marked as ,Will The power factor in ; ， In the formula, Indicates safe current carrying capacity. It represents the fixed constant in the safe current carrying capacity calculation formula, that is, the current limiting ratio. Indicates the conversion factor between phase current and line current, Indicates that in a three-phase circuit, the rated power, rated voltage, rated power factor and conversion coefficient are calculated to obtain the The maximum line current value in the power supply circuit, It represents the product of the current limiting ratio and the maximum line current value, that is, The safe current carrying capacity in the circuit of a power supply device.

6. The method for emergency dispatching of a distribution network according to claim 5, characterized in that: In step 3, the current index The calculation process is as follows: Extract the load data set The power load data of the power supply equipment is marked as ; exist Filter out monitoring cycles During the period The current load value of the power supply equipment is marked as , Respectively Power supply equipment at 1 minute, 2 minutes, and Current load value at minute; ， ， In the formula, represents the current index, Indicates monitoring cycle During the period The sum of the current loads of the power supply equipment is divided by the duration to obtain the average current load value per minute. Indicates Power supply equipment in Current load value at minute, Indicates that according to the variance formula, the variance value calculated is the monitoring period During the period The current index of a power supply device.

7. The method for emergency dispatching of a distribution network according to claim 6, characterized in that: In step 3, the voltage index The calculation process is as follows: exist Filter out monitoring cycles During the period The voltage load value of the power supply equipment is marked as , Respectively Power supply equipment at 1 minute, 2 minutes, and Voltage load value at minute; ， ， In the formula, represents the voltage index, Indicates monitoring cycle During the period The sum of the voltage loads of the power supply equipment is divided by the duration to obtain the average voltage load value per minute. Indicates Power supply equipment in Voltage load value at minute, Indicates that according to the variance formula, the variance value calculated is the monitoring period During the period Voltage index of a power supply device.

8. The method for emergency dispatching of a distribution network according to claim 7, characterized in that: In step 4, the fault frequency The calculation process is as follows: According to the fault data set, statistics The total number of failures of the power supply equipment is marked as ; like When The time point at which the power supply device fails is marked as , , , , , Respectively Power supply equipment 1st, 2nd, and The time when the failure occurred; ， In the formula, Indicates the fault frequency, Indicates The first and second power supply equipment The time difference between failures, Indicates that the The total number of failures of the power supply equipment is divided by the time difference to obtain The failure frequency of each power supply device.

9. The method for emergency dispatching of a distribution network according to claim 8, characterized in that: In step 4, the scheduling data group The calculation formula is as follows: Will The output current in ,Will The output voltage in ; ， In the formula, represents a scheduling data group, express At that time, The difference between the output current of a power supply device and the current load value, express At that time, The difference between the output voltage of the power supply equipment and the voltage load value, the scheduling data group includes the The current difference and voltage difference of the power supply equipment.

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