阅读说明：本技术 一种配电自动化主站和就地保护联合自愈方法 (Power distribution automation master station and in-situ protection combined self-healing method ) 是由 何洪流 付宇 吴鹏 李前敏 陈宇 肖小兵 蔡永翔 王卓月 张恒荣 黄如云 郑友卓 于 2021-09-16 设计创作，主要内容包括：本发明公开了一种配电自动化主站/就地联合自愈方法,当线路发生故障时首先由变电站出口开关保护动作,当发生瞬时性故障时,重合闸成功则恢复送电；当发生永久性故障时,线路停电,由配电自动化主站收集线路停电前配电终端故障信号,配电自动化主站依据配电网的网架结构和设备运行的当时信息,结合配电自动化终端故障信号、开关状态信息进行网络拓扑分析,进行故障的定位、隔离和恢复非故障区域的供电；解决了配电自动化实施中配网自动化成套开关有断路器和负荷开关两类,产品品牌种类繁多,同一线路存在多品牌、电流型和电压型自动化成套开关,不利于就地馈线自动化自愈功能投运等技术问题。(The invention discloses a power distribution automation master station/local joint self-healing method, when a line fails, a substation outlet switch is used for protecting action, and when a transient fault occurs, power transmission is recovered after reclosing is successful; when a permanent fault occurs, the line is powered off, a distribution automation master station collects distribution terminal fault signals before the line is powered off, and the distribution automation master station performs network topology analysis according to the grid structure of the power distribution network and the current information of equipment operation by combining the distribution automation terminal fault signals and the switch state information to perform fault positioning, isolation and recovery of power supply of a non-fault area; the automatic complete switch of distribution network has circuit breaker and load switch two types in having solved distribution automation and implementing, and the product brand is various, and there are the automatic complete switch of many brands, current type and voltage type in same circuit, is unfavorable for technical problem such as the automatic self-healing function of feeder line in situ operation.)

1. A distribution automation master station/on-site joint self-healing method is characterized in that: it includes: when a line fails, firstly, a transformer substation outlet switch protects the action, and when transient failure occurs, power transmission is recovered after reclosing is successful; when a permanent fault occurs, the line is powered off, the distribution automation master station collects distribution terminal fault signals before the line is powered off, and the distribution automation master station performs network topology analysis by combining the distribution automation terminal fault signals and the switch state information according to the grid structure of the power distribution network and the current information of equipment operation, so as to perform fault positioning, isolation and recovery of power supply of a non-fault area.

2. The power distribution automation master station/on-site combined self-healing method according to claim 1, wherein: the transient fault processing method comprises the following steps: when a line is in short circuit or has a ground fault, a first switch of the line or an outlet switch of a transformer substation performs protection action, the line is powered off, reclosing action is performed for a period of time, the line is electrified, and if the fault disappears, the line is recovered to be normal.

3. The power distribution automation master station/on-site combined self-healing method according to claim 1, wherein: the permanent fault processing method comprises the following steps: when a line is short-circuited or has an earth fault, a primary reclosing action of a line head switch or a substation outlet switch fails, the line is powered off, the fault is a permanent fault, line automation switches are controlled by a master station in a centralized mode, a master station system starts a fault processing process after information is collected, fault positioning, isolation and power supply conversion analysis are carried out according to fault action signals and field equipment action conditions by combining power distribution network topology information, real-time operation mode information and real-time load data, power supply conversion remote control is carried out according to analysis results, and primary fault processing of a power distribution network is completed.

4. The power distribution automation master station/on-site combined self-healing method according to claim 1, wherein: the substation outlet switch has a pole difference mode and a primary reclosing function.

5. The power distribution automation master station/on-site combined self-healing method according to claim 1, wherein: the method for collecting the fault signals of the power distribution terminal before the line power failure by the power distribution automation main station comprises the following steps: the distribution automation main station communicates with the distribution terminal in an optical fiber communication mode, a carrier communication mode or a wireless communication mode to acquire fault signals.

6. The power distribution automation master station/on-site combined self-healing method according to claim 1, wherein: the power distribution automation complete equipment has three remote functions and is connected to the main station.

7. The power distribution automation master station/on-site combined self-healing method according to claim 1, wherein: the line switch power distribution terminal has current and voltage, and comprises a zero sequence current and voltage acquisition function and a clock time synchronization function.

8. The power distribution automation master station/on-site combined self-healing method according to claim 1, wherein: the distribution automation system meets the main station self-healing admission technical condition and the line self-healing admission technical principle.

Technical Field

The invention relates to a distribution automation main station and in-situ protection combined self-healing method, and belongs to the technical field of distribution network line fault processing.

Background

The distribution network automation technology is focused on solving the problems of fault location, isolation and recovery of non-fault area power supply of a distribution network, and plays a vital role in reducing the power failure time of users and improving the power supply reliability and the user satisfaction. Distribution network automation has been popularized in distribution networks of various regions as an important technical means for improving production operation and maintenance level and power supply reliability; however, in many years of distribution network automation construction and application, some distribution network automation practicability is still low, the configuration and layout of stock distribution automation switch equipment have certain problems, and part of local municipalities generate technical confusion in local feeder automation function application control strategies. In order to comprehensively improve the practical level of the distribution network, the self-healing construction of the distribution network needs to be expanded urgently, and the self-healing strategy of the distribution automation needs to be innovated.

The problem that exists in the automatic implementation of distribution, some regional distribution network automation complete sets switch have circuit breaker and load switch two kinds, and the product brand is various, and there are the automatic complete sets switch of many brands, current type and voltage type in same circuit, is unfavorable for automatic self-healing function of feeder in place to be put into operation, has influenced the automatic operation work of feeder in place of distribution station operation and maintenance personnel.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the utility model provides a distribution automation master station/joint self-healing method in place to solve some regional distribution network automation complete sets switch has circuit breaker and load switch two kinds in distribution automation implementation, and the product brand is various, and there are many brands, electric current type and voltage type automation complete sets switch in the same circuit, is unfavorable for automatic self-healing function of feeder automation in place to be put into operation, has influenced distribution station automation operation and maintenance personnel's automatic operation work of feeder automation in place etc. technical problem.

The technical scheme adopted by the invention is as follows:

a distribution automation master station/local joint self-healing method comprises the following steps: when a line fails, firstly, a transformer substation outlet switch protects the action, and when transient failure occurs, power transmission is recovered after reclosing is successful; when a permanent fault occurs, the line is powered off, the distribution automation master station collects distribution terminal fault signals before the line is powered off, and the distribution automation master station performs network topology analysis by combining the distribution automation terminal fault signals and the switch state information according to the grid structure of the power distribution network and the current information of equipment operation, so as to perform fault positioning, isolation and recovery of power supply of a non-fault area.

The transient fault processing method comprises the following steps: when a line is in short circuit or has a ground fault, a first switch of the line or an outlet switch of a transformer substation performs protection action, the line is powered off, reclosing action is performed for a period of time, the line is electrified, and if the fault disappears, the line is recovered to be normal.

The permanent fault processing method comprises the following steps: when a line is short-circuited or has an earth fault, a primary reclosing action of a line head switch or a substation outlet switch fails, the line is powered off, the fault is a permanent fault, line automation switches are controlled by a master station in a centralized mode, a master station system starts a fault processing process after information is collected, fault positioning, isolation and power supply conversion analysis are carried out according to fault action signals and field equipment action conditions by combining power distribution network topology information, real-time operation mode information and real-time load data, power supply conversion remote control is carried out according to analysis results, and primary fault processing of a power distribution network is completed.

The substation outlet switch has a pole difference mode and a primary reclosing function.

The method for collecting the fault signals of the power distribution terminal before the line power failure by the power distribution automation main station comprises the following steps: the distribution automation main station communicates with the distribution terminal in an optical fiber communication mode, a carrier communication mode or a wireless communication mode to acquire fault signals.

The power distribution automation complete equipment has three remote functions and is connected to the main station.

The line switch power distribution terminal has current and voltage, and comprises a zero sequence current and voltage acquisition function and a clock time synchronization function.

The distribution automation system meets the main station self-healing admission technical condition and the line self-healing admission technical principle.

The invention has the beneficial effects that:

the invention provides a distribution automation main station and local combined self-healing control mode, under the condition that the type of the existing equipment is not changed, the functions of the distribution automation main station and the local automation terminal are utilized, the combined self-healing of the main station/local distribution automation function is realized on a 10kV feeder line, and the positioning, the isolation and the power supply recovery of a non-fault area of a fault are completed.

When a line fails, firstly, a substation outlet switch (with an extreme difference mode and a primary reclosing function) protects actions, and when an instantaneous failure occurs, a reclosing result restores power transmission; when a permanent fault occurs, the line is powered off, the distribution automation master station collects distribution terminal fault signals (generally, overcurrent and zero sequence alarm) before the line is powered off by utilizing various communication modes (optical fiber communication, carrier communication, wireless communication and the like), and the distribution automation master station performs network topology analysis according to the grid structure of the distribution network and the current information of equipment operation in combination with the distribution automation terminal fault signals, the switching state and other information to perform fault positioning, isolation and power supply recovery in a non-fault area.

The invention is suitable for various scenes of the same line distribution automation product brand. The existing power distribution automation equipment resources are utilized, and the line fault self-healing is realized according to the terminal configuration and the line topology structure.

The automatic distribution network complete switch solves the technical problems that in the automatic distribution network implementation, some areas are provided with two types of circuit breakers and load switches, product brands are various, the same circuit is provided with multiple brands, current type and voltage type automatic complete switches, the operation of the automatic self-healing function of the local feeder is not facilitated, the operation work of the automatic operation and maintenance personnel of a distribution substation on the local feeder is influenced, and the like.

Drawings

Fig. 1 is a fault processing flow chart of a distribution automation master station and an in-situ joint self-healing control strategy;

fig. 2 is a topology diagram of two contact zone branch lines of a distribution network.

Detailed Description

The technical scheme of the invention is as follows: when a line fails, firstly, a substation outlet switch (with an extreme difference mode and a primary reclosing function) protects actions, and when an instantaneous failure occurs, a reclosing result restores power transmission; when a permanent fault occurs, the line is powered off, the distribution automation master station collects distribution terminal fault signals (generally, overcurrent and zero sequence alarm) before the line is powered off by utilizing various communication modes (optical fiber communication, carrier communication, wireless communication and the like), and the distribution automation master station performs network topology analysis according to the grid structure of the distribution network and the current information of equipment operation in combination with the distribution automation terminal fault signals, the switching state and other information to perform fault positioning, isolation and power supply recovery in a non-fault area.

The method for processing the transient fault comprises the following steps: when a line is in a short circuit or a ground fault, a first switch (or a substation outlet switch) of the line performs protection action, the line is powered off, reclosing action is performed after a certain time (1 s) is delayed, the line is electrified, and if the fault disappears, the line is recovered to be normal.

The permanent fault processing method comprises the following steps: when a line is short-circuited or has a ground fault, a primary reclosing action of a line head switch (or a substation outlet switch) fails, the line is powered off, the fault is a permanent fault, a line automation switch is centrally controlled by a master station, a master station system starts a fault processing process after information is collected, fault positioning, isolation and power transfer analysis are carried out according to fault action signals and field equipment action conditions by combining power distribution network topology information, real-time operation mode information, real-time load data and the like, power transfer remote control is carried out according to analysis results, and primary fault processing of a power distribution network is completed.

The method requires that the power distribution automation complete equipment has three remote functions and is connected to the master station.

The method needs the distribution automation system to meet the main station self-healing admission technical condition and the line self-healing admission technical principle.

The method requires that a line switch power distribution terminal has a current and voltage (including zero sequence current and voltage) acquisition function and a clock time synchronization function.

The method requires that a line head switch (or a substation outlet switch) has current range protection and one-time reclosing functions.

The invention is further described with reference to the accompanying drawings and specific embodiments.

Example 1: the application of the distribution automation master station/local joint self-healing control method needs to be provided with a complete distribution automation system, and is implemented by combining a distribution automation master station and a local distribution automation terminal according to the fault processing flow shown in fig. 1.

Now, the two connection zones branch lines in fig. 2 are taken as an example to realize the self-healing of the line fault by using the method of the present invention.

In fig. 2, CB is an outgoing line breaker with time limit protection and reclosing functions; FS 1-FS 6 different types of intelligent switches; LSW1, LSW 2: different types of intelligent interconnection switches; YS 1-YS 2 are user boundary switches.

The circuit substation outlet switch CB (or FS1 first switch) has the functions of short-circuit fault and ground fault protection, and simultaneously has the function of reclosing, and the fault self-healing is completed by one-time reclosing on the transient fault of the circuit; for a permanent fault, after one-time reclosing failure, the power distribution automation system judges a fault region by means of a communication means through the cooperation of a power distribution terminal and a power distribution main station and by means of the power distribution main station when the fault occurs, isolates the fault region through automatic remote control or manual mode, and recovers power supply in a non-fault region.

Correctly setting the outlet switch (or the first switch of the line) of the line substation has the protection function parameters of short-circuit fault and earth fault, and finishing the self-healing function programming of the automatic main station of power distribution.

The method is implemented to deploy the self-healing function of the feeder line, and the distribution automation system achieves correct graph model topology, correct terminal information, correct terminal data, correct line operation mode, correct association between a protection state and a switch and correct equipment listing.

The switch node roles include: the switch can be a load switch and a breaker, and has three remote functions.

The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention, and therefore, the scope of the present invention should be determined by the scope of the claims.