CN114285161B - Distributed power distribution protection fault self-healing overload processing method - Google Patents
Distributed power distribution protection fault self-healing overload processing method Download PDFInfo
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Abstract
The invention discloses a distributed power distribution protection fault self-healing overload processing method, which comprises the following steps: inputting basic information of the power distribution network before and after the fault; calculating the load of a distribution room before the fault of the distribution network according to the basic information of the distribution network; calculating the maximum power supply load recovery capacity of a normal operation feeder line after the power distribution network fails according to the power distribution network basic information; carrying out overload judgment and fault self-healing processing on the distribution network according to the distribution room load before the distribution network faults and the maximum power supply restoration load capacity of the normal operation feeder line after the distribution network faults; and outputting the power distribution network updating information after the fault self-healing processing. The invention can rapidly and accurately self-heal the distribution faults and effectively improve the load rate of the feeder line, and can provide theoretical guidance and reference for rapidly recovering power supply in non-fault areas after the distribution network faults.
Description
Technical Field
The invention relates to a distributed power distribution protection fault self-healing overload processing method, and belongs to the technical field of power distribution network fault self-healing.
Background
With a large number of small power supplies connected into the power distribution network, a large number of potential fault threats are brought to the power distribution network, and the fault recovery difficulty is increased. The larger the scale of the distribution network, the larger the number of small power supplies connected, the more complex the topology network architecture, and generally, the more electrical equipment variables to be considered are required to be considered for fault self-healing, the more complex the operation state of the distribution network to be considered is, and the challenges are increased for fault self-healing power supply recovery. The traditional power restoration solution after the distribution network fault usually has the characteristics of high working strength, tedious procedures, poor aging and the like, the engineering application site needs to find out the fault point through repeated superposition trial-and-error operation, the power restoration time is longer, the risk of power failure is enlarged, the power failure range is large even if the transformer substation outlet switch is required to trip, in addition, the traditional power restoration solution after the fault has higher requirements on a background main station and a communication network, and the traditional scheme cannot meet the fault processing requirement of the current power distribution network.
The distributed protection fault self-healing method is characterized in that the distributed protection fault self-healing method is adopted, namely distributed fault positioning, isolation and fault recovery strategies have larger and more obvious technical advantages, and the distributed protection fault self-healing method meets the construction requirements of a novel power system. The distributed protection self-healing terminal can automatically identify a network topological structure and a contact switch, and information is exchanged between adjacent terminals to realize fault positioning and isolation. The power distribution protection fault self-healing does not need or only needs a small amount of human intervention, and by utilizing advanced protection and control means, the power distribution system can timely detect the system fault, early warn unsafe states of the system and perform corresponding operation, and after the fault occurs, the power distribution system can realize rapid fault isolation and self-recovery power supply, and normal power supply of non-fault users is not influenced or the influence of the normal power supply is minimized.
At present, the self-healing of the distribution faults is generally embodied in the aspects of automatically isolating faults and automatically recovering power supply after system faults, in actual operation, the self-healing function of the distribution network is realized, a plurality of key technical problems such as distribution network load problems, quick fault positioning, isolation and recovery power supply optimizing strategies and the like are required to be researched and solved, and the effect of the self-healing of the distribution faults can be ensured only by solving the key technical problems.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a self-healing overload processing method for distributed power distribution protection faults, which is used for judging overload problems before self-healing of the distributed power distribution protection faults according to a safety margin principle, so that the self-healing of the distributed power distribution faults is performed rapidly and accurately, the load rate of a feeder line is effectively improved, and the self-healing performance of the distributed power distribution protection faults is further optimized.
In order to solve the technical problems, the invention adopts the following technical means:
the invention provides a distributed power distribution protection fault self-healing overload processing method, which comprises the following steps:
inputting basic information of the power distribution network before and after the fault;
calculating the load of a distribution room before the fault of the distribution network according to the basic information of the distribution network;
calculating the maximum power supply load recovery capacity of a normal operation feeder line after the power distribution network fails according to the power distribution network basic information;
carrying out overload judgment and fault self-healing processing on the distribution network according to the distribution room load before the distribution network faults and the maximum power supply restoration load capacity of the normal operation feeder line after the distribution network faults;
and outputting the power distribution network updating information after the fault self-healing processing.
Further, the basic information of the power distribution network comprises a power distribution network topology structure, node voltage threshold values, line impedance values, open loop point positions and small power supply positions.
Further, the calculation formula of the load of the distribution room before the fault of the distribution network is as follows:
wherein,representing the instantaneous load current before fault of the r-th distribution room in the distribution network, < >>Representing the instantaneous load current of the main line before the fault of the r-th distribution room,/and the power distribution room>Representing instantaneous load current of main line outgoing line before fault of the r-th distribution room,/and the like>The instantaneous load current of the small power supply before the fault of the R-th distribution room is represented, and r=1, 2, …, and R are the number of distribution rooms in the distribution network.
Further, the calculation formula of the maximum power supply load recovery capability of the normal operation feeder line after the power distribution network faults is as follows:
wherein,maximum recovered power load value, indicative of normal operation of the feeder to the fault self-healing switch>Represents the maximum load current of the normal operation feeder L, < >>Indicating that normal operation of the feeder allows an increased maximum load current, +.>The open loop point tie-line after the fault self-healing switch-on allows increased maximum load current under the condition that the voltage safety requirement is met.
Further, the maximum load current of the normal operation feeder line LThe calculation formula of (2) is as follows:
wherein,representing the maximum load current of the branch line L under normal operation feeder L, I l Representing the instantaneous load current of the branch line L under normal operation feeder L before failure.
Further, normal operation of the feeder allows for increased maximum load current while meeting voltage safety requirementsThe calculation formula of (2) is as follows:
wherein V is low Voltage value representing lowest point of node voltage on normal operation feed line, V min Represents the lower limit of the safe threshold value of the normal operation feeder voltage, Z sw And the impedance value of the normal operation feeder line from the head end of the distribution network power supply to the lowest node voltage point is shown.
Further, the open loop point interconnecting line allows increased maximum load current after the fault self-healing closing under the condition of meeting the voltage safety requirementThe calculation formula of (2) is as follows:
wherein V is sf Representing voltage value, V, at open loop point tie-line on normal operation feeder line before power distribution network fault min Represents the lower limit of the safe threshold value of the normal operation feeder voltage, Z ss Representing the line impedance value from the head end of the distribution network power supply to the connecting line of the open loop point before failure, Z sf Representing the line impedance value of the open loop point tie line branch.
Further, the method for judging overload and self-healing fault of the power distribution network comprises the following steps:
when meeting the requirementsWhen the distributed power distribution protection self-healing device is used for conducting fault self-healing closing, and recovering power supply of a non-fault area, wherein +_ is adopted>Maximum recovered power load value, indicative of normal operation of the feeder to the fault self-healing switch>Representing pre-fault transient load current, lambda, of the r-th distribution room in a distribution network r The method comprises the steps of providing a safe and stable power supply capacity coefficient for an r-th power distribution room in a power distribution network;
when not meetingAnd when the device is powered on automatically by using the standby power supply, the power supply of the non-fault area is recovered.
Further, the method comprises the following steps:
and after the power supply of the non-fault area is recovered, judging whether the open loop point topological structure is adjusted, and if so, re-identifying the network topological structure of the power distribution network to obtain an updated power distribution network topological structure.
Furthermore, the updated information of the power distribution network comprises a fault isolation state, an open-loop point switch state, an automatic standby power supply switching device state, a small power supply working state, a power loss range and an updated power distribution network topological structure.
The following advantages can be obtained by adopting the technical means:
the invention provides a distributed power distribution protection fault self-healing overload processing method, which is characterized in that overload judgment is carried out on power distribution fault self-healing closing money through analyzing power distribution network information, then fault self-healing processing is carried out, the effect of power distribution fault self-healing is ensured, and overload judgment problems before the distributed power distribution protection fault self-healing closing are processed from the safety margin principle. According to the method, the global voltage and current safety constraint of the power distribution network is comprehensively considered, the calculation process of the load capacity of the power distribution network is fine and practical, the rapid calculation can be realized through engineering application, the overload judgment result is accurate, and the efficiency is high; the fault self-healing judging logic of the method is simple, and can quickly recover the power supply of a non-fault line area, reduce the fault power failure range and accelerate the fault repairing speed. The method can effectively improve the load rate of the feeder line, provides theoretical guidance and reference for the rapid recovery of the power supply of the non-fault area after the power distribution network faults, is beneficial to the popularization and application of the distributed power distribution protection self-healing technology, and is beneficial to the realization of the rapid recovery of the power supply of the non-fault area in the second level or even in the millisecond level.
Drawings
FIG. 1 is a flow chart of steps of a distributed power distribution protection fault self-healing overload processing method of the present invention;
fig. 2 is a flow chart of the implementation of the method of the present invention.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings:
the invention provides a distributed power distribution protection fault self-healing overload processing method, which is shown in figures 1 and 2 and specifically comprises the following steps:
and step A, inputting basic information of the power distribution network before and after the fault, wherein the basic information of the power distribution network comprises a power distribution network topology structure, a node voltage threshold value, a line impedance value, an open loop point position and a small power supply position. Etc.
And B, calculating the load of the distribution room before the fault of the distribution network according to the basic information of the distribution network.
The distribution room load calculation model is established, and the expression is as follows:
wherein,representing the instantaneous load current before fault of the r-th distribution room in the distribution network, < >>Representing the instantaneous load current of the main line before the fault of the r-th distribution room,/and the power distribution room>Representing instantaneous load current of main line outgoing line before fault of the r-th distribution room,/and the like>The instantaneous load current of the small power supply before the fault of the R-th distribution room is represented, and r=1, 2, …, and R are the number of distribution rooms in the distribution network. Sigma is a summary symbol representing statistics of the incoming and outgoing main line load currents and the small power supply load currents belonging to the nth distribution room.
And C, calculating the maximum power supply load recovery capacity of the normal operation feeder line after the power distribution network faults according to the basic information of the power distribution network.
And step C01, establishing a normal operation feeder line safety margin model, wherein the normal operation feeder line safety margin model comprises a normal operation feeder line current safety constraint model and a normal operation feeder line voltage safety constraint model.
(1) The expression of the normal operation feeder current safety constraint model is as follows:
wherein,indicating the maximum load current that can be provided by the normal operation feeder L，/>Representing the maximum load current I that can be supplied by the branch line L under normal operation of the feeder L l Representing the instantaneous load current of the branch line L under normal operation feeder L before failure.
(2) The expression of the normal operation feeder voltage safety constraint model is as follows:
wherein,representing the maximum load current allowed to increase by the normal operation feeder under the condition of meeting the voltage safety requirement, namely the maximum allowable load current with the voltage not lower than the lower limit of the voltage safety threshold of the normal operation feeder, V low Voltage value representing lowest point of node voltage on normal operation feed line, V min Represents the lower limit of the safe threshold value of the normal operation feeder voltage, Z sw And the impedance value of the normal operation feeder line from the head end of the distribution network power supply to the lowest node voltage point is shown.
Step C02, establishing an open loop point tie line safety margin model, wherein the expression is as follows:
wherein,the maximum load current which is allowed to be increased by the open loop point connecting line after the self-healing of the fault under the condition of meeting the voltage safety requirement, namely the maximum load current which can be increased by the voltage after the self-healing of the fault and is not lower than the lower limit of the normal operation feeder line voltage safety threshold value from the head end of the distribution network power supply to the open loop point, V sf Representing open loop point connection on normal operation feeder line before power distribution network faultVoltage value at line, Z ss Representing the line impedance value from the head end of the distribution network power supply to the connecting line of the open loop point before failure, Z sf Representing the line impedance value of the open loop point tie line branch.
Step C03, constructing a normal operation feeder maximum power restoration load capacity model according to a normal operation feeder safety margin model and an open loop point tie line safety margin model, wherein the expression is as follows:
wherein,and the maximum recovered power supply load value provided by the normal operation feeder to the fault self-healing switch is represented.
And C, calculating the maximum load which can be provided by the power distribution network for recovering power supply and providing support for subsequent overload processing.
And D, judging overload of the power distribution network and performing fault self-healing processing according to the load of the power distribution room before the fault of the power distribution network and the maximum power supply load recovery capacity of the normal operation feeder line after the fault of the power distribution network, wherein the specific operation is as follows:
step D01, the invention provides a fault self-healing overload processing strategy:
wherein lambda is r The system is a safe and stable power supply capacity coefficient of an r-th power distribution room in the power distribution network.
Step D02, when meetingAnd when the distributed power distribution protection self-healing device is used for performing fault self-healing closing, and recovering power supply of a non-fault area.
Step D03, when not meetingAnd when the distributed power distribution protection self-healing device is in a fault self-healing state, the automatic switching-on device of the standby power supply is used for recovering the power supply of the non-fault area.
And E, after the power supply of the non-fault area is recovered, judging whether the open loop point topological structure is adjusted, and if so, re-identifying the network topological structure of the power distribution network to obtain an updated power distribution network topological structure.
And F, outputting the power distribution network updating information after the fault self-healing processing, wherein the power distribution network updating information comprises information such as a fault isolation state, an open-loop point switch state, a standby power automatic switching device state, a small power supply working state, a power loss range, an updated power distribution network topological structure and the like.
Compared with the prior art, the invention provides a self-healing overload processing method for distributed power distribution protection faults, which is used for processing the overload problem before self-healing closing of the distributed power distribution protection faults from the safety margin principle, and has the following advantages: (1) The global voltage and current safety constraint of the power distribution network is comprehensively considered, and the provided safety margin model is finer, is more convenient for engineering application to calculate quickly, and has higher practicability and popularization value; (2) The fault self-healing discrimination logic is simple, and can quickly recover the power supply of a non-fault line area, reduce the fault power failure range and accelerate the fault repair speed; (3) The load rate of the feeder line can be effectively improved, theoretical guidance and reference are provided for the rapid recovery of power supply in the non-fault area after the power distribution network faults, the popularization and application of the distributed power distribution protection self-healing technology are facilitated, and the rapid recovery of power supply in the non-fault area in the second level or even in the millisecond level is facilitated.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (9)
1. The distributed power distribution protection fault self-healing overload processing method is characterized by comprising the following steps of:
inputting basic information of the power distribution network before and after the fault;
calculating the load of a distribution room before the fault of the distribution network according to the basic information of the distribution network;
calculating the maximum power supply load recovery capacity of a normal operation feeder line after the power distribution network fails according to the power distribution network basic information;
carrying out overload judgment and fault self-healing processing on the distribution network according to the distribution room load before the distribution network faults and the maximum power supply restoration load capacity of the normal operation feeder line after the distribution network faults;
outputting the power distribution network updating information after the fault self-healing processing;
the method for judging overload and performing fault self-healing processing on the power distribution network comprises the following steps:
when meeting the requirementsWhen the distributed power distribution protection self-healing device is used for conducting fault self-healing closing, and recovering power supply of a non-fault area, wherein +_ is adopted>Representing the maximum recovered power load value provided by the normal operating feeder to the fault self-healing switch,representing pre-fault transient load current, lambda, of the r-th distribution room in a distribution network r The method comprises the steps of providing a safe and stable power supply capacity coefficient for an r-th power distribution room in a power distribution network;
when not meetingAnd when the device is powered on automatically by using the standby power supply, the power supply of the non-fault area is recovered.
2. The method for processing the self-healing overload of the distributed power distribution protection fault according to claim 1, wherein the basic information of the power distribution network comprises a power distribution network topology structure, a node voltage threshold, a line impedance value, an open loop point position and a small power supply position.
3. The method for processing self-healing overload of a distributed power distribution protection fault according to claim 1, wherein a calculation formula of a load of a power distribution room before the power distribution network fault is as follows:
wherein,representing the instantaneous load current before fault of the r-th distribution room in the distribution network, < >>Representing the instantaneous load current of the main line before the fault of the r-th distribution room,/and the power distribution room>Representing instantaneous load current of main line outgoing line before fault of the r-th distribution room,/and the like>The instantaneous load current of the small power supply before the fault of the R-th distribution room is represented, and r=1, 2, …, and R are the number of distribution rooms in the distribution network.
4. The method for processing the self-healing overload of the distributed power distribution protection fault according to claim 1, wherein the calculation formula of the maximum power supply load recovery capacity of the normal operation feeder after the power distribution network fault is as follows:
wherein,maximum recovered power load value, indicative of normal operation of the feeder to the fault self-healing switch>Represents the maximum load current of the normal operation feeder L, < >>Indicating that normal operation of the feeder allows an increased maximum load current, +.>The open loop point tie-line after the fault self-healing switch-on allows increased maximum load current under the condition that the voltage safety requirement is met.
5. A distributed power distribution protection fault self-healing overload processing method as claimed in claim 4 wherein the maximum load current of the normal operation feeder LThe calculation formula of (2) is as follows:
wherein,representing the maximum load current of the branch line L under normal operation feeder L, I l Representing the instantaneous load current of the branch line L under normal operation feeder L before failure.
6. According toA distributed power distribution protection fault self-healing overload processing method as claimed in claim 4 wherein the normal operation feeder allows increased maximum load current if voltage safety requirements are metThe calculation formula of (2) is as follows:
wherein V is low Voltage value representing lowest point of node voltage on normal operation feed line, V min Represents the lower limit of the safe threshold value of the normal operation feeder voltage, Z sw And the impedance value of the normal operation feeder line from the head end of the distribution network power supply to the lowest node voltage point is shown.
7. A distributed power distribution protection fault self-healing overload processing method as claimed in claim 4, wherein the fault self-healing post-closing open loop point tie allows increased maximum load current if voltage safety requirements are metThe calculation formula of (2) is as follows:
wherein V is sf Representing voltage value, V, at open loop point tie-line on normal operation feeder line before power distribution network fault min Represents the lower limit of the safe threshold value of the normal operation feeder voltage, Z ss Representing the line impedance value from the head end of the distribution network power supply to the connecting line of the open loop point before failure, Z sf Representing the line impedance value of the open loop point tie line branch.
8. A distributed power distribution protection fault self-healing overload processing method according to claim 1, further comprising the steps of:
and after the power supply of the non-fault area is recovered, judging whether the open loop point topological structure is adjusted, and if so, re-identifying the network topological structure of the power distribution network to obtain an updated power distribution network topological structure.
9. The method for processing the self-healing overload of the distributed power distribution protection fault according to claim 1 or 8, wherein the updated information of the power distribution network comprises a fault isolation state, an open-loop point switch state, a standby power automatic input device state, a small power working state, a power loss range and an updated power distribution network topology structure.
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