CN108667013A - A multi-source heterogeneous distribution network switch position identification and analysis method - Google Patents

Abstract

The invention discloses a kind of multi-source heterogeneous power distribution network position of the switch to recognize analysis method.This method includes：Step 1：Respectively switch builds the netted topology controlment of radiation as artis using in power distribution network；Step 2：Acquire the power data and real time monitoring of each switch；Step 3：Calculating analysis is carried out to the power of each switch, and judges the position of each switch according to the result for calculating analysis.Using the method for the present invention when determining current topological structure, the search of the up and down branch of place node can be passed through, topological structure is determined according to the situation of change of this branch road interdependent node measurement, it eliminates influence of the mistake measurement to determining topological structure simultaneously in this way, new thinking is provided for the misidentification in line loss calculation system.

Description

A multi-source heterogeneous distribution network switch position identification and analysis method

technical field

The invention relates to the field of switch position detection in a distribution network, in particular to a method for identifying and analyzing switch positions in a multi-source heterogeneous distribution network.

Background technique

The grid side of the multi-source heterogeneous distribution network is equipped with a large number of controllable switches, which makes the network topology of the distribution network more flexible. In the process of distribution network topology analysis, the wrong switch operation state not only affects the admittance matrix, but also affects the topological fragmentation of the power grid and the node scale of each grid. After the topology analysis, it is necessary to convert the data such as the power of the switch into the measurement information required for state estimation. Analyzing the generation process of the measurement shows that when the specified positive direction of the switching power and the switching ratio are wrong, the wrong measurement data will be generated. It can be seen that the wrong information of the grid switch leads to most of the topological errors and bad data encountered in grid state estimation. Power network topology errors are generally divided into two types: the switch state is closed but actually open, and the switch state is open but actually closed.

The key to line loss calculation is to obtain the correct grid structure, parameters, and operating data. The calculation error caused by inaccurate original data is 82% to 84% of the total error. It can be seen that whether the original data is complete and accurate is the key to accurate line loss calculation results, and the grid topology, operation data, and maintenance data obtained by the line loss calculation system There are a large number of errors in information, etc., and it is difficult to identify them. In order to obtain more accurate line loss calculation results, error information must be eliminated, so the switch status information should be identified before network loss calculation.

Contents of the invention

The purpose of the present invention is to provide a multi-source heterogeneous distribution network switch position identification and analysis method for the deficiencies in the prior art.

In order to achieve the above purpose, the present invention provides a multi-source heterogeneous distribution network switch position identification and analysis method, including:

Step 1: Build a radial network topology model with each switch in the distribution network as the node;

Step 2: Collect the power data of each switch and monitor in real time;

Step 3: Calculate and analyze the power of each switch, and judge the position of each switch according to the result of the calculation and analysis.

Further, said step 3 includes:

Step 301: Count the total number N of switches that cause other power changes when each switch is turned off;

Step 302: Count the number N1 of the fulfillment conditions of switches whose actual power changes among the total number N;

Step 303: Calculate the probability f=N1/N of each switch being turned off.

Step 304: When the probability f>0.5 of a certain switch being off, it is considered as off; otherwise, it is considered as closed.

Further, when analyzing the state of a certain switch, the switch is used as the dividing point to judge the difference between the previous stage switch and the current stage switch and the subsequent stage switch;

The pre-stage switch uses abs[P-(P0-P')]<R as the judgment condition for whether it is established;

The current stage and subsequent stage switches use P<R as the judgment condition for whether it is established or not, wherein, P is the active power of each switch before the power changes, P0 is the active power of each switch after the power change, and P' is the previous The active power reduced by the stage switch, R is the set value.

Further, when calculating and analyzing the disconnection probability of two or more switches in the same main circuit, the calculation and analysis of the conditions for each switch to be disconnected separately and at the same time are combined, and the one with the largest comprehensive disconnection probability f of each switch is taken as the calculation and analysis result.

Beneficial effects: when using the method of the present invention to determine the current topology, the topology can be determined by searching the upward and downward branches of the node and according to the measurement changes of the relevant nodes on the branch, thus eliminating the wrong measurement at the same time The impact on determining the topology structure provides a new idea for the error identification in the line loss calculation system.

Description of drawings

Fig. 1 is a schematic structural diagram of a multi-source heterogeneous distribution network according to an embodiment of the present invention.

Detailed ways

The present invention will be further illustrated below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

An embodiment of the present invention provides a multi-source heterogeneous distribution network switch position identification and analysis method, the method includes:

Step 1: Use the switches in the distribution network as nodes to build a radial mesh topology model. The radial network refers to the dendritic network in which power is transmitted in a fixed direction, and the distribution network generally belongs to the radial network. When the topological structure of the radial network does not change, no matter how the operating state of the power grid changes, the power on the branch must flow to the load group composed of one or more load points, and the nodes in the network have a clear relationship between the power supply point and the power receiving point. point.

The radial network has two main features: first, when the topology changes in the radial network, the power distribution relationship can be determined in advance (without considering the network loss); second, when the topology changes in the radial network When changing, the injection power of each node can be determined.

Step 2: Collect the power data of each switch and monitor it in real time.

Step 3: Calculate and analyze the power of each switch, and judge the position of each switch according to the result of the calculation and analysis.

Among them, step 3 specifically includes:

Step 301: Count the total number N of switches that cause other power changes when each switch is turned off. When analyzing the status of a certain switch, the switch is used as the dividing point to judge the difference between the previous stage switch and the current stage and subsequent stage switches.

Step 302: Count the number N1 of switches whose actual power changes among the total number N of which the conditions are satisfied. The pre-stage switch uses abs[P-(P0-P')]<R as the judgment condition for whether it is established or not. The current stage and subsequent stage switches use P<R as the judgment condition for whether it is established or not, wherein, P is the active power of each switch before the power changes, P0 is the active power of each switch after the power change, and P' is the previous stage The active power reduced by the switch, R is the set value, generally set as a small positive number.

For example, as shown in Figure 1, the distribution network has 24 switches, the labels are respectively 1 to 24, now it is necessary to determine the state of the switch 8, after the switch 8 is broken, the power of the switches behind it (9, 10, 12, 13, 14) will become zero, the power (4, 3, 2, 1) of the switch in front of it will reduce P ', and the switch and follow-up switch (5, 6, 7, 11) and different The power of switches (15 and subsequent nodes) on the main branch remains unchanged. The node where the power changes can be taken as the condition for judging the position of the switch, as shown in Table 1:

Discrimination condition table for switch 8 disconnection

Table 1

Among them, P' is the power before the switch 8 is disconnected, here, N=10, when the disconnection probability of the switch 8 is f=N1/N>0.5, then the switch 8 is considered to be in the disconnected state, otherwise, the switch 8 is in the disconnected state. closed state.

Step 303: Calculate the probability f=N1/N of each switch being turned off.

Step 304: When the probability f>0.5 of a certain switch being off, it is considered as off; otherwise, it is considered as closed.

When calculating and analyzing the disconnection probability of two or more switches in the same main circuit, the calculation and analysis of the conditions of each switch being disconnected separately and at the same time are combined, and the one with the largest comprehensive disconnection probability f of each switch is taken as the calculation and analysis result. For example, switch 8 and switch 5, at this time, it is only necessary to judge the conditions for switch 5 to be turned off, the condition for switch 8 to be turned off, and the conditions for switches 8 and 5 to be turned off at the same time, as shown in Tables 1 to 3:

Table of judging conditions for the disconnection of switch 5

Table 2

Table of judging conditions for simultaneous disconnection of switch 8 and switch 5

table 3

Among them, P〞 is the power before the switch 5 is disconnected, respectively calculate the probability f1 of the switch 5 disconnection, the probability f2 of the switch 8 disconnection, and the probability f3 of the simultaneous disconnection of the switches 5 and 8, and take f1, f2 and f3 as the maximum as the conclusion of computational analysis.

In summary, when using the method of the present invention to determine the current topology, the topology can be determined by searching the upper and lower branches of the node, and according to the changes in the measurement of the relevant nodes on the branch, so that errors can be eliminated at the same time. The influence of measurement on determining the topology structure provides a new idea for error identification in the line loss calculation system.

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 principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (4)

1. a kind of multi-source heterogeneous power distribution network position of the switch recognizes analysis method, which is characterized in that including：

Step 1：Respectively switch builds the netted topology controlment of radiation as artis using in power distribution network；

Step 2：Acquire the power data and real time monitoring of each switch；

Step 3：Calculating analysis is carried out to the power of each switch, and judges the position of each switch according to the result for calculating analysis It sets.

2. the multi-source heterogeneous power distribution network position of the switch according to claim 1 recognizes analysis method, which is characterized in that the step Rapid 3 include：

Step 301：The total N that other power changed switch is caused when each switch disconnects is counted respectively；

Step 302：Count the establishment condition number N1 of the changed switch of actual power in sum N；

Step 303：Calculate the probability f=N1/N that each switch disconnects.

Step 304：As the probability f that certain switch disconnects>When 0.5, it is considered as disconnection, otherwise, is considered as closure.

3. the multi-source heterogeneous power distribution network position of the switch according to claim 2 recognizes analysis method, which is characterized in that analyze certain When the state of switch, using the switch as separation, by the judgement respectively of prime switch and this grade and rear class switch；

The prime switch is with abs [P- (P0-P ')]<R as whether true Rule of judgment；

Described grade and rear class switch are with P<R as whether true Rule of judgment, wherein P be power change before it is each The active power of switch, P0 are the active power respectively switched after changed power, and P ' is the active power that prime switch reduces, R For setting value.

4. the multi-source heterogeneous power distribution network position of the switch according to claim 2 recognizes analysis method, which is characterized in that calculating There are two analyzing in same major loop when the disconnection probability of above switch, synthesis is each to switch the condition meter respectively and simultaneously switched off Point counting is analysed, and takes the comprehensive probability f the maximum that disconnects of each switch as Calculation results.