CN112165118A - A multi-fault power supply recovery method for distribution network - Google Patents

A multi-fault power supply recovery method for distribution network Download PDF

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CN112165118A
CN112165118A CN202011052099.1A CN202011052099A CN112165118A CN 112165118 A CN112165118 A CN 112165118A CN 202011052099 A CN202011052099 A CN 202011052099A CN 112165118 A CN112165118 A CN 112165118A
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power
fault
power supply
load
recovery
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Inventor
陆昱
乐弘习
朱洪成
滕莹冰
龚越明
谢婧
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State Grid Shanghai Electric Power Co Ltd
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State Grid Shanghai Electric Power Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/388—Islanding, i.e. disconnection of local power supply from the network
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/12—Circuit arrangements for AC mains or AC distribution networks for adjusting voltage in AC networks by changing a characteristic of the network load
    • H02J3/14—Circuit arrangements for AC mains or AC distribution networks for adjusting voltage in AC networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
    • H02J3/144—Demand-response operation of the power transmission or distribution network
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/222—Demand response systems, e.g. load shedding, peak shaving

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a multi-fault power supply recovery method for a power distribution network, which comprises the following steps: step 1, positioning the accurate position of a fault and isolating a fault area; step 2, tripping the fault feeder DGs off respective grid-connected circuit breakers, and converting the DGs with black start capability into an island operation mode to supply power to local loads; step 3, after fault isolation, searching the number of interruptible loads, disjunction switches and primary interconnection switches in the power loss area, judging whether the sum of the transfer capacity and the black start DG capacity of the primary interconnection switch meets the load requirement of the power loss area, and if so, implementing a complete recovery power supply scheme; step 4, searching a power supply recovery feasible solution set according to the power supply recovery model if the power supply recovery requirement is not met; and 5, comparing the feasible solutions, analyzing the objective functions to obtain a comprehensive optimal solution, and obtaining an optimal scheme for system fault recovery. The method can realize rapid power supply recovery after multiple faults of the power distribution network.

Description

Multi-fault power supply recovery method for power distribution network
Technical Field
The invention relates to a multi-fault power supply recovery method for a power distribution network, which is used in the field of smart power grids.
Background
When the power distribution network suffers from a large-scale power failure caused by a huge man-made or natural disaster, the power supply of the power distribution network needs to be recovered in time. Because the fault points are very many, the power supply recovery of all the lost load points cannot be met through the switch operation at the moment, which fault points must be preferentially recovered, then the remaining fault points are recovered after the first-aid repair, in the first-aid repair process, because the fault points are more and the first-aid repair resources are limited, which fault points need to be preferentially repaired, and other fault points are first-aid repaired after the first-aid repair of the fault points is finished. The above complications make power restoration strategies that are often used by power companies in the event of small-scale line or equipment failures unsuitable.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a power supply recovery method for multiple faults of a power distribution network, which can realize rapid power supply recovery after multiple faults of the power distribution network.
One technical scheme for achieving the above purpose is as follows: a multi-fault power supply recovery method for a power distribution network comprises the following steps:
step 1, after a fault occurs, positioning the accurate position of the fault, tripping off a power supply side circuit breaker closest to the fault position, and effectively isolating a fault area;
step 2, tripping the fault feeder DGs off respective grid-connected breakers, converting the DGs with black start capability into an island operation mode to supply power to a local load, reducing the load if the capacity is insufficient, and keeping the non-fault feeder DGs in a grid-connected operation state;
step 3, after fault isolation, searching the number of interruptible loads, disjunction switches and primary interconnection switches in the power loss area, judging whether the sum of the transfer capacity and the black start DG capacity of the primary interconnection switch meets the load requirement of the power loss area, and if so, implementing a complete recovery power supply scheme;
step 4, searching a power supply recovery feasible solution set according to the power supply recovery model if the power supply recovery requirement is not met;
and 5, comparing the feasible solutions, analyzing the objective functions to obtain a comprehensive optimal solution, and obtaining an optimal scheme for system fault recovery.
Further, in step 2, the model for converting the DG with the black start capability into the islanding operation mode to supply power to the local load is
Figure BDA0002709895360000021
Wherein e represents a proportionality coefficient; lLiWhether the ith load is put into use or not is represented, and values are 0 and 1; h isLiAlso represents the corresponding load weight, PLiRepresenting the ith load power; w is ajRepresenting the weight of the jth path.
The multi-fault power supply recovery method for the power distribution network aims at minimizing the power failure time of an important load point and the power failure time of a total power loss load point, globally considers an emergency measure scheme after a large-scale fault of the power distribution network, is beneficial to shortening the multi-fault power supply recovery time of the power distribution network and improving the power supply quality of a power department interface
Detailed Description
In order to better understand the technical solution of the present invention, the following detailed description is made by specific examples:
the invention discloses a multi-fault power supply recovery method for a power distribution network, which comprises the following steps of:
step 1, after a fault occurs, positioning the accurate position of the fault, tripping off a power supply side circuit breaker closest to the fault position, and effectively isolating a fault area;
step 2, tripping the fault feeder DGs off respective grid-connected breakers, converting the DGs with black start capability into an island operation mode to supply power to a local load, reducing the load if the capacity is insufficient, and keeping the non-fault feeder DGs in a grid-connected operation state;
step 3, after fault isolation, searching the number of interruptible loads, disjunction switches and primary interconnection switches in the power loss area, judging whether the sum of the transfer capacity and the black start DG capacity of the primary interconnection switch meets the load requirement of the power loss area, and if so, implementing a complete recovery power supply scheme;
step 4, searching a power supply recovery feasible solution set according to the power supply recovery model if the power supply recovery requirement is not met;
and 5, comparing the feasible solutions, analyzing the objective functions to obtain a comprehensive optimal solution, and obtaining an optimal scheme for system fault recovery.
And reasonably arranging the optimal sequence and the recovery path of the DGs in the black start by taking the maximum important load recovery and the shortest path as targets. The method for establishing the power supply recovery optimization model comprises the following steps:
Figure BDA0002709895360000031
wherein e represents a proportionality coefficient; lLiWhether the ith load is put into use or not is represented, and values are 0 and 1; h isLiAlso represents the corresponding load weight, PLiRepresenting the ith load power; w is ajRepresenting the weight of the jth path.
And solving the problem of large-area power failure and power supply recovery by using a mathematical model of an Agent Environment Rule (AER). Considering island operation, various influencing factors in power supply recovery of a power distribution network with small power supplies are expressed as intelligent bodies, environments and environment updating rules in a model in combination with intelligent environment rules (AER). The established model is as follows:
Figure BDA0002709895360000032
in the formula, kBThe total outage load in the outage region of the meter; gamma represents a power failure area set obtained after fault isolation; k is a radical ofiA load amount representing the recovered ith load; a represents whether all the power failure loads can be completely recovered or not, the value 1 represents energy, and the value 0 represents incapability; ploss.sysRepresenting power distribution system network losses that do not include islanding operation; ploss.islandjRepresenting the active loss of the jth island.
Considering the existing recovery method of comprehensive optimization target weighting, combining multi-target optimization and multi-Agent (AER) cooperative control technology, and the application of DG and microgrid in the intelligent power distribution network, the power distribution network can quickly and efficiently recover power supply on the premise of ensuring safety and reliability through a series of steps of generation, safety check, optimization, execution and the like of a power supply recovery scheme. The power supply recovery model is as follows:
f＝max∑i∈NλiLi
n＝min Nj
Figure BDA0002709895360000033
in the formula, λiIndicating the importance of the ith load; l isiRepresenting the load amount of the ith load recovery; n is a radical ofjThe number of switches which are required to be operated for restoring the normal power supply of the power-loss load is represented; s1Representing the actual load apparent power of the feeder; slimRepresenting the ultimate load apparent power of the feeder.
In the fault recovery process, a local power supply is used as much as possible, and the contribution rate of a local unit is ensured. A corresponding power supply recovery model is established:
Figure BDA0002709895360000041
Figure BDA0002709895360000042
Figure BDA0002709895360000043
in the formula, M represents an important load node set in a power loss area; a represents the set of all load nodes in a power-off area; c represents a renewable energy source unit set;
Figure BDA0002709895360000044
represents the load of node i; b isiRepresenting the state of node i;
Figure BDA0002709895360000045
and the actual output and the maximum output of the unit i are shown.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.

Claims (2)

1.一种配电网多故障供电恢复方法，其特征在于，包括如下步骤：1. a power distribution network multi-fault power supply recovery method, is characterized in that, comprises the steps: 步骤1，故障发生后，定位故障准确位置，跳开故障位置最近的电源侧断路器，有效隔离故障区域；Step 1. After the fault occurs, locate the exact location of the fault, and trip the circuit breaker on the power side closest to the fault location to effectively isolate the fault area; 步骤2，使故障馈线DG跳开各自并网断路器，具备黑启动能力的DG转为孤岛运行方式给本地负荷供电，如果容量不足则削减负荷，非故障馈线DG继续保持并网运行状态；Step 2: Make the faulty feeder DG trip off its grid-connected circuit breaker, and the DG with black start capability will switch to the island operation mode to supply power to the local load. If the capacity is insufficient, the load will be reduced, and the non-faulted feeder DG will continue to maintain the grid-connected operation state; 步骤3，故障隔离后，搜索失电区的可中断负荷、分断开关与一级联络开关的数量，判断一级联络开关的转供容量和黑启动DG容量之和是否满足失电区域负荷需要，若满足，则施行完全恢复供电方案；Step 3: After the fault is isolated, search for the number of interruptible loads, disconnecting switches and primary tie switches in the power outage area, and determine whether the sum of the transfer capacity of the primary tie switch and the black-start DG capacity meets the load requirements in the outage area. If satisfied, implement a complete power recovery plan; 步骤4，如不满足完全恢复供电需求，根据供电恢复模型，搜索供电恢复可行解集；Step 4: If the demand for complete power restoration is not met, search for a feasible solution set for power restoration according to the power restoration model; 步骤5，比较各可行解，分析各目标函数，得出综合最优解，即得出系统故障恢复的最优方案。Step 5: Compare each feasible solution, analyze each objective function, and obtain a comprehensive optimal solution, that is, obtain an optimal plan for system fault recovery. 2.根据权利要求1所述的一种配电网多故障供电恢复方法，其特征在于，步骤2中，具备黑启动能力的DG转为孤岛运行方式给本地负荷供电的模型为2. A method for restoring power supply from multiple faults in a distribution network according to claim 1, wherein in step 2, the DG with black start capability is converted into an islanded operation mode to supply power to the local load as follows:
Figure FDA0002709895350000011
Figure FDA0002709895350000011
 式中，e表示比例系数；lLi表示第i个负荷是否投入使用，取值为0和1；hLi也表示相应的负荷权重，PLi表示第i个负荷功率；wj表示第j条路径的权重。In the formula, e represents the proportionality coefficient; l Li represents whether the ith load is put into use, and its values are 0 and 1; h Li also represents the corresponding load weight, P Li represents the power of the ith load; w j represents the jth load The weight of the path.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113111476A (en) * 2021-04-29 2021-07-13 华北电力大学 Human-vehicle-object emergency resource optimal scheduling method for improving toughness of power grid

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
周忠平: "配电网多故障抢修与恢复协同策略研究", 《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113111476A (en) * 2021-04-29 2021-07-13 华北电力大学 Human-vehicle-object emergency resource optimal scheduling method for improving toughness of power grid

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