CN108287294A - Distribution network failure region Fast Identification Method based on power failure distribution transforming and topological analysis - Google Patents

Abstract

The invention discloses a kind of distribution network failure region Fast Identification Method based on power failure distribution transforming and topological analysis, random substation feeder of finding are exported to next power failure distribution transforming；The upstream of circuit switchs recently where inversely finding the power failure distribution transforming；It is traversed downwards by the switch, searches the line outage and match control with changed scale；Judge line status with control with changed scale by the line outage, judge that substation feeder exports whether downward power failure distribution transforming is queried, if, then judge that switch to next stage switch room is fault zone recently for most upstream dead line upstream, if not, then continue random substation feeder of finding to export to next power failure distribution transforming, and the above steps are repeated, until substation feeder exports downward power failure distribution transforming and is queried.Wire topologies in the real time data and production management system that whether have a power failure the present invention is based on distribution transforming in power information acquisition system, Fast Identification go out power-off fault region in power distribution network, and providing aid decision for distribution scheduling, inspection and repairing supports.

Description

Fast identification method of distribution network fault area based on power outage distribution transformer and topology analysis

technical field

The invention relates to the field of network fault analysis of electric power systems, in particular to a fast identification method for distribution network fault areas based on power outage distribution transformers and topology analysis.

Background technique

As a power network directly facing users, the distribution network has a large scale, various equipment, and a complex power supply environment, which has become a hard-hit area with frequent faults. According to statistics, more than 80% of power outages are caused by distribution network faults. Due to the low automation coverage of the existing medium and low voltage distribution network, when a 10kV medium voltage line branch fails, it is difficult for the power supply department to quickly obtain power outage information, and it has to rely on user feedback to arrange maintenance work and restore power supply, which greatly affects users power supply reliability. At present, a small number of important user power supply lines rely on distribution secondary terminals, fault indicators, etc. to monitor the status of the distribution network to identify fault areas, but due to large investment and long construction period, the progress is slow.

With the continuous improvement of the informatization level of the distribution network, the production management system (PMS) and the power consumption information collection system have fully covered the medium and low voltage power distribution and power consumption parts. Therefore, how to reasonably use the topology and distribution transformer data in the existing system to quickly identify the fault area of the distribution network is of great significance.

Contents of the invention

In order to solve the deficiencies in the prior art, the present invention provides a method for quickly identifying fault areas in distribution networks based on power outage distribution transformers and topology analysis, which solves the problem that the power outage fault areas in distribution networks cannot be quickly identified in the prior art .

In order to achieve the above goals, the present invention adopts the following technical solution: a method for quickly identifying fault areas in distribution networks based on power outage distribution transformers and topology analysis, which is characterized in that it includes the following steps:

Step 1: Randomly find a power failure distribution transformer with the feeder outlet of the substation downward;

Step 2: Reverse search for the nearest upstream switch of the line where the outage transformer is located;

Step 3: Traverse downwards from the nearest upstream switch, take the switch to the nearest downstream switch as the line where the switch is located, and find the power failure distribution ratio T of the line;

Step 4: Determine line failure threshold X and line non-power failure threshold Y based on historical power failure and non-power failure distribution data; determine the line status by the power failure distribution ratio T of the line, and when X<T≤100%, determine the line power failure , when Y≤T≤X, it is determined that the line is suspected of having a power outage, and when 0%<T<Y, it is determined that the line is not powered off;

Step 5: Judging whether all distribution transformers are queried for power outages at the outlet of the substation feeder. If so, determine that the fault area is between the upstream nearest switch of the most upstream outage line and the next-level switch. If not, continue to randomly search for the substation feeder outlet direction. The next power outage distribution transformer, and repeat the above steps, until the substation feeder outlet downward power failure distribution transformer is queried.

The aforementioned fast identification method for distribution network fault areas based on power outage distribution transformer and topology analysis is characterized in that: the active value, three-phase voltage and three-phase current in the power consumption information collection system of the power outage distribution transformer are all zero distribution transformers.

The aforementioned fast identification method for distribution network fault areas based on power outage distribution transformers and topology analysis is characterized in that: the reverse direction is the opposite direction of the line flow direction in the information system.

The aforementioned fast identification method for distribution network fault areas based on power outage distribution transformers and topology analysis is characterized in that: the information system is a production management system PMS.

The aforementioned fast identification method for distribution network fault areas based on power outage distribution transformers and topology analysis is characterized in that: the power outage distribution transformer ratio of the line is: T=power outage distribution transformer number/total distribution transformer number.

The aforementioned fast identification method for distribution network fault areas based on power outage distribution transformers and topology analysis is characterized in that: the line outage fault threshold X is the average of the number of power outage distribution transformers/total distribution transformers in multiple power outage events value; line non-power outage fault threshold Y is the average number of line power outage distribution transformers/total distribution transformer number in multiple non-power outage events.

The beneficial effect achieved by the present invention: based on the real-time data of whether the distribution transformer is out of power in the power consumption information collection system and the line topology structure in the production management system, the present invention can effectively use the existing information to quickly identify the power outage fault area in the distribution network, Provide auxiliary decision support for distribution network scheduling, inspection and emergency repair, with low development cost and remarkable effect.

Description of drawings

Fig. 1 is a flow chart of the inventive method;

Fig. 2 is a schematic diagram of the circuit topology of an embodiment based on the method of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

As shown in Figure 1, a fast identification method for distribution network fault areas based on power outage distribution transformer and topology analysis, based on the real-time data of whether the distribution transformer is out of power in the power consumption information collection system and the line topology in the production management system, can be quickly identified The power outage fault area in the distribution network includes the following six steps:

Step 1: Randomly find the feeder outlet of the substation to the next power outage distribution transformer, mark the distribution transformer with zero active value, three-phase voltage, and three-phase current in the power consumption information collection system as the power outage distribution transformer, and use the feeder outlet of the substation Downward is an area, randomly looking for a power failure distribution transformer;

Step 2: Take the direction of the line flow in the production management system PMS as the positive direction, reversely search for the nearest upstream switch of the line where the power outage distribution transformer is located in step 1;

Step 3: Traversing down from the switch in step 2, taking the switch to the nearest downstream switch as the line where the switch is located, and finding the ratio T of power failure distribution transformers of the line, T=number of power failure distribution transformers/total number of distribution transformers;

Step 4: Determine line failure threshold X and line non-power failure threshold Y from historical power failure and non-power distribution data. In the event of a power outage, determine the fault threshold X of the line failure and the threshold Y of the non-power failure of the line; The average number of power outage distribution transformers/total number of distribution transformers in a non-power outage event; the line status is judged by the power outage distribution ratio T. When X<T≤100%, it is determined that the line is out of power. When Y≤T≤X, It is judged that the line is suspected of power outage, and when 0%<T<Y, it is judged that the line is not powered off;

Step 5: Determine whether all the distribution transformers at the feeder outlet of the substation described in step 1 have been queried. If so, then determine that the fault area is between the upstream switch of the most upstream power outage line and the next-level switch. If not, continue to search randomly In Step 1, a power-off distribution transformer whose feeder outlet of the substation goes downward has not been queried, and the above steps 1 to 5 are repeated until the power-failure distribution transformer of the feeder outlet of the substation described in Step 1 is queried.

Example:

Referring to Figure 2, a fast identification method for distribution network fault areas based on power outage distribution transformer and topology analysis, the specific steps are as follows:

Step 1: Randomly find the feeder outlet of the substation to the next power outage distribution transformer, as shown in Figure 2 at ①.

Step 2: Obtain the line topology and the positive direction of the line flow from the PMS, and reversely search for the nearest switch upstream of the line where the power outage distribution transformer is located in step 1, such as switch 2 in Figure 2.

Step 3: Traversing downwards from switch 2, taking switch 2 to the nearest downstream switch 4 as the line where switch 2 is located, that is, line 2, and finding the ratio of power failure distribution transformers in line 2 T = number of power failure distribution transformers / total number of distribution transformers = 80% .

Step 4: From the 500 power outage events and 500 non-power outage events confirmed by the power supply company, determine the line 2 power outage fault threshold X = 70%, and the line 2 non-power outage fault threshold Y = 10%; from the power outage distribution ratio T = 80% determines the state of the line, because X=70%, and when X<T≤100%, it is determined that line 2 is powered off.

Step 5: In Fig. 2, if all the distribution transformers with feeder outlet downwards of the substation have not been queried, then continue to randomly search for the power-failure distribution transformers with the feeder outlet of the substation described in step 1, as shown in ② in Fig. 2. Traverse line 3 downward from switch 3, and judge the line status by the power outage distribution ratio T=100% of line 3, because X=70%, and when X<T≤100%, it is determined that line 3 is out of power. Judging again that in Figure 2 the feeder outlet of the substation has not been queried for power outage distribution transformers, then continue to randomly search for power outage distribution transformers that have not been queried for the feeder outlet of the substation in step 1, as shown in Figure 2. Traverse line 4 downward from switch 4, and judge the line status by the power outage distribution ratio T=100% of line 4, because X=70%, and when X<T≤100%, it is determined that line 4 is out of power. If it is judged again that all the power outage distribution transformers at the feeder outlet of the substation in Fig. 2 have been queried, then it can be determined from the power outage lines 2, 3, and 4 in Fig. failure area.

Based on the real-time data of whether the distribution transformer is out of power in the power consumption information collection system and the line topology structure in the production management system, the present invention can effectively use the existing information to quickly identify the power outage fault area in the distribution network, and provide services for distribution network scheduling, inspection and inspection. Emergency repairs provide auxiliary decision support. The development cost is small and the effect is remarkable.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, some improvements and modifications can also be made. It should also be regarded as the protection scope of the present invention.

Claims (6)

1. A method for fast identification of distribution network fault areas based on power outage distribution transformer and topology analysis, characterized in that: comprising the following steps: Step 1: Randomly find a power failure distribution transformer with the feeder outlet of the substation downward; Step 2: Reverse search for the nearest upstream switch of the line where the outage transformer is located; Step 3: Traverse downwards from the nearest upstream switch, take the switch to the nearest downstream switch as the line where the switch is located, and find the power failure distribution ratio T of the line; Step 4: Determine line failure threshold X and line non-power failure threshold Y based on historical power failure and non-power failure distribution data; determine the line status by the power failure distribution ratio T of the line, and when X<T≤100%, determine the line power failure , when Y≤T≤X, it is determined that the line is suspected of having a power outage, and when 0%<T<Y, it is determined that the line is not powered off; Step 5: Judging whether all distribution transformers are queried for power outages at the outlet of the substation feeder. If so, determine that the fault area is between the upstream nearest switch of the most upstream outage line and the next-level switch. If not, continue to randomly search for the substation feeder outlet direction. The next power outage distribution transformer, and repeat the above steps, until the substation feeder outlet downward power failure distribution transformer is queried. 2. A method for quickly identifying fault areas in distribution networks based on power outage distribution transformers and topology analysis according to claim 1, characterized in that: said power outage distribution transformers have active power values and three-phase voltages in the power consumption information collection system , The distribution transformer with zero three-phase current. 3. A fast identification method for distribution network fault areas based on power outage distribution transformers and topology analysis according to claim 1, characterized in that: the reverse direction is the opposite direction of the line flow direction in the information system. 4. A fast identification method for distribution network fault areas based on outage distribution transformers and topology analysis according to claim 3, characterized in that: the information system is a production management system (PMS). 5. A fast identification method for distribution network fault areas based on power outage distribution transformers and topology analysis according to claim 1, characterized in that: the power outage distribution transformer ratio of the line is: T=power outage distribution transformer number/total distribution Change the number of units. 6. A fast identification method for distribution network fault areas based on power outage distribution transformers and topology analysis according to claim 1, characterized in that: the line outage fault threshold X is the number of power outage distribution transformers in multiple power outage events /Average of the total number of distribution transformers; line non-power failure threshold Y is the average number of line power failure distribution transformers/total distribution transformers in multiple non-power failure events.