CN118091330A - Fault positioning method and system for power distribution network with distributed power supply - Google Patents
Fault positioning method and system for power distribution network with distributed power supply Download PDFInfo
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Abstract
The invention discloses a fault positioning method and a system for a power distribution network with a distributed power supply, wherein the fault positioning method comprises the following steps: step one: dividing the total area of the power distribution network into areas, calculating and obtaining the total value of load power in the area of the power distribution network, and calculating and obtaining the main circuit voltage fluctuation value in the main circuit power grid in the area of the power distribution network; comparing the main circuit voltage fluctuation value with a preset main circuit voltage fluctuation threshold value; obtaining a main circuit voltage abnormal signal; acquiring a main circuit resistance value in a power distribution network area, and calculating to obtain a main circuit current deviation ratio of a branch circuit current total value and a main circuit current value in a main circuit power grid; obtaining a branch power grid abnormal signal; based on the branch grid anomaly signal; judging whether the branch current value is in the branch current value range or not; the stable signal of the branch power grid is obtained or the fault signal of the branch power grid is generated, so that the coordinates of the branch power grid can be accurately obtained; to perform quick inspection repair; and the normal operation of the whole power distribution network area is better ensured.
Description
Technical Field
The invention relates to the technical field of power distribution automation of power systems, in particular to a fault positioning method and system for a power distribution network with a distributed power supply.
Background
In the process of building intelligent power grids in China, the application scale of distributed power supplies (micro-grids) is continuously expanded, the power distribution network is being converted from a vertical radiation type network to a horizontal network distributed over the power supplies, the traditional feeder automation technology cannot accurately locate fault areas in fault processing of the distributed power supplies, and accurate location is provided for subsequent operations such as fault isolation, power supply restoration in non-fault areas and the like.
The invention patent with the publication number of CN103048587A discloses a fault locating method, device and system of a power distribution network with a distributed power supply, wherein the fault locating method comprises the following steps: the power distribution automation master station system establishes the memory topology of primary equipment of a power distribution network through a power distribution network topology model; when the distribution network feeder line fails, the terminal equipment judges the fault current direction on site and sends the fault current direction to the main station system, and the main station system determines a fault area and boundary equipment according to the fault signal and the fault current direction so as to achieve the effect of quickly positioning the fault area of the distribution network;
However, in the above method, the fault location is still only to perform fault determination of the regional power grid, and a more accurate position cannot be obtained, for example, in fault location of a trunk and a branch in a power distribution network, a more accurate position cannot be realized, and in the process of fault occurrence, maintenance personnel still need to perform re-determination, so that maintenance efficiency cannot be effectively improved.
Disclosure of Invention
The invention aims to provide a fault locating method and system for a power distribution network with a distributed power supply, so as to solve the problems in the background.
The aim of the invention can be achieved by the following technical scheme:
a fault locating method and system for a power distribution network with distributed power supplies comprises the following steps:
dividing the total area of the power distribution network into areas and marking each power distribution network area as i; obtaining the number of distributed power sources in a power distribution network area i, summing rated powers of the distributed power sources in the power distribution network area i, obtaining rated total power of the distributed power sources in the power distribution network area i, and marking the total power as Pi; calculating and obtaining a total load power value in a power distribution network area i, and marking the total load power value as FPi; and comparing the total load power FPi with the rated total power Pi; obtaining a verification load signal;
Based on the load stabilization signal; acquiring working information in a shunt power grid in a power distribution network area i; calculating to obtain a main circuit voltage fluctuation value in a main circuit power grid in a power distribution network area i; comparing the main circuit voltage fluctuation value with a preset main circuit voltage fluctuation threshold value; obtaining a main circuit voltage abnormal signal; acquiring a branch current value in a trunk power grid in a power distribution network area i; judging whether the branch current value is 0; obtaining a branch power grid detection signal or a branch power grid fault signal;
Based on the branch power grid detection signals, calculating and obtaining a main circuit current value in a power distribution network area i;
summing the branch current values in the main circuit power grid to obtain a branch current total value; calculating to obtain a main circuit current deviation rate of a main circuit current total value and a main circuit current value in a main circuit power grid; comparing the main circuit current deviation rate with a main circuit current deviation rate threshold value to obtain a branch circuit power grid abnormal signal;
Based on the branch grid anomaly signal; acquiring a branch resistance value in a branch power grid and a branch temperature value in the branch power grid, and acquiring a main circuit voltage value in a main circuit power grid; calculating and obtaining a branch current theoretical value in the branch power grid based on a temperature resistance linear model in the branch power grid;
Judging whether the branch current value is in the branch current value range or not; and obtaining a branch power grid stable signal or a branch power grid fault signal.
As a further scheme of the invention: comparing the total load power FPi with the nominal total power Pi;
if the total load power FPi is greater than the rated total power Pi, generating an overload risk signal;
And if the total load power value FPi is smaller than or equal to the rated total power Pi, generating a verification load signal.
As a further scheme of the invention: the acquisition mode of the main circuit voltage fluctuation value is as follows:
Acquiring working information in a shunt power grid in a power distribution network area i; wherein, branching power grid includes: a main circuit power grid and a branch circuit power grid; and marking the main grid as (i, m), and the branch grid as (i, m, n);
the working information includes: a main circuit voltage value GU, a main circuit current value GL and a branch circuit current value ZL;
Marking a main circuit voltage value in a main circuit power grid in a power distribution network area i as GU （i,m）;
Acquiring rated voltage of a distributed power supply in a power distribution network area i and marking the rated voltage as FUi;
By passing through And calculating to obtain a main circuit voltage fluctuation value BUV （i,m） in a main circuit power grid in the power distribution network area i.
As a further scheme of the invention: comparing the main circuit voltage fluctuation value with a preset main circuit voltage fluctuation threshold value;
A plurality of road voltage fluctuation values are smaller than or equal to a preset main road voltage fluctuation threshold value; generating a main voltage stabilizing signal;
the voltage fluctuation values of a plurality of paths are larger than a preset trunk voltage fluctuation threshold; a main voltage anomaly signal is generated.
As a further scheme of the invention: if the branch current value is 0; generating a branch power grid fault signal;
if the branch current value is 0; a branch grid detection signal is generated.
As a further scheme of the invention: the acquisition mode of the main circuit current deviation rate is as follows:
Acquiring a trunk circuit resistance value GR （i,m） in a power distribution network area i, calculating and acquiring a trunk circuit current value in the power distribution network area i through the relation between voltage, resistance and current, and marking the trunk circuit current value as GL （i,m）;
Summing the branch current values ZL （i,m,n） in the main power grid m to obtain a branch current total value ZLz （i,m） in the main power grid m;
By passing through And calculating to obtain a main circuit current deviation rate IPC （i,m） of the main circuit current total value ZLz （i,m） and the main circuit current value GL （i,m） in the main circuit power grid m.
As a further scheme of the invention: comparing the main circuit current deviation rate with a main circuit current deviation rate threshold value;
The deviation rate of the current in a plurality of paths is smaller than or equal to the deviation rate threshold value of the current in a main path; generating a branch power grid stabilizing signal;
The current deviation rate of a plurality of paths is larger than the current deviation rate threshold value of a plurality of paths; a branch grid anomaly signal is generated.
As a further scheme of the invention: judging whether the branch current value is in the branch current value range or not;
if the branch current value is in the branch current value range, generating a branch power grid stabilizing signal;
And if the branch current value is not in the branch current value range, generating a branch power grid fault signal.
As a further scheme of the invention: the temperature resistance linear model is constructed in the following manner:
Acquiring historical data or experimental data in a branch power grid; the method comprises the steps of including data information in a plurality of groups of historical working states; the method comprises a historical current value SL, a rated resistance value SR of a branch power grid, a historical temperature value ST and a historical voltage value SU in the working process of the branch power grid;
By passing through Calculating and obtaining an influence coefficient gamma and a correction factor theta of a temperature value on a resistance value in a branch power grid;
The temperature resistance linear model of the branch power grid can be obtained: ；
Wherein U is the voltage value of the branch power grid; r is a rated resistance value in the branch power grid; t is a temperature value in the working process of the branch power grid; l is the current value of the branch power grid in the working process.
As a further scheme of the invention: a fault location system for a power distribution network having distributed power sources:
comprising the following steps:
region allocation module: the method comprises the steps of dividing a total area of a power distribution network into areas and marking each power distribution network area as i; obtaining the number of distributed power sources in a power distribution network area i, summing rated powers of the distributed power sources in the power distribution network area i, obtaining rated total power of the distributed power sources in the power distribution network area i, and marking the total power as Pi;
Load pre-checking module: the method is used for calculating and acquiring the total value of load power in the power distribution network area i and is marked as FPi; and comparing the total load power FPi with the rated total power Pi; obtaining a verification load signal;
the power grid detection module: the system comprises a trunk detection unit and a branch detection unit;
A main road detection unit: the method comprises the steps of acquiring working information in a shunt power grid in a power distribution network area i; calculating to obtain a main circuit voltage fluctuation value in a main circuit power grid in a power distribution network area i;
comparing the main circuit voltage fluctuation value with a preset main circuit voltage fluctuation threshold value; obtaining a main circuit voltage abnormal signal;
A branch detection unit: the method comprises the steps of acquiring a branch current value in a trunk power grid in a power distribution network area i; judging whether the branch current value is 0; obtaining a branch power grid fault signal or a branch power grid detection signal;
Based on the branch power grid detection signals, calculating and obtaining a main circuit current value in a power distribution network area i;
summing the branch current values in the main circuit power grid to obtain a branch current total value; calculating to obtain a main circuit current deviation rate of a main circuit current total value and a main circuit current value in a main circuit power grid; comparing the main circuit current deviation rate with a main circuit current deviation rate threshold value to obtain a branch circuit power grid abnormal signal;
And a fault positioning module: based on the branch grid anomaly signal; acquiring a branch resistance value in a branch power grid and a branch temperature value in the branch power grid, and acquiring a main circuit voltage value in a main circuit power grid; calculating and obtaining a branch current theoretical value in the branch power grid based on a temperature resistance linear model in the branch power grid;
Judging whether the branch current value is in the branch current value range or not; and obtaining a branch power grid stable signal or a branch power grid fault signal.
The invention has the beneficial effects that:
In the invention, the load of the distributed power supply in the power distribution network area is pre-detected, and the whole power distribution network area is detected from the source so as to ensure the normal operation of the whole power distribution network area; then, by carrying out fluctuation detection on the voltage values in the main power grid, whether the voltage of each main power grid in a single power distribution network area is stable or not is further judged;
Then, calculating the branch current in each main circuit, monitoring the self working temperature of each branch circuit based on the branch circuit resistance data at the temperature, calculating the deviation of the branch circuit current, judging whether the actual current has larger deviation under the influence of the self temperature, and indicating that the branch circuit power grid has faults when the actual current has larger deviation, so that the coordinates of the branch circuit power grid can be accurately obtained; to perform quick inspection repair; the fault overhaul efficiency of the maintainer is improved, and the normal operation of the whole power distribution network area is better ensured.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic flow chart of the method of the present invention;
FIG. 2 is a system block diagram of the present invention;
Fig. 3 is a schematic diagram of a power grid detection module according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a fault locating method for a power distribution network with a distributed power source includes:
Step one: dividing the total area of the power distribution network into areas and marking each power distribution network area as i; obtaining the number of distributed power sources in a power distribution network area i, summing rated powers of the distributed power sources in the power distribution network area i, obtaining rated total power of the distributed power sources in the power distribution network area i, and marking the total power as Pi;
Step two: calculating and obtaining a total load power value in a power distribution network area i, and marking the total load power value as FPi; and comparing the total load power FPi with the rated total power Pi;
if the total load power FPi is greater than the rated total power Pi, generating an overload risk signal;
If the total load power value FPi is smaller than or equal to the rated total power Pi, generating a verification load signal;
The method comprises the steps that the load of a distributed power supply in a power distribution network area is pre-detected, and the whole power distribution network area is detected from a source so as to ensure the normal operation of the whole power distribution network area;
Step three: based on the load stabilization signal; acquiring working information in a shunt power grid in a power distribution network area i; calculating to obtain a main circuit voltage fluctuation value in a main circuit power grid in a power distribution network area i;
comparing the main circuit voltage fluctuation value with a preset main circuit voltage fluctuation threshold value; obtaining a main circuit voltage abnormal signal;
step four: based on the main voltage anomaly signal; acquiring a branch current value in a trunk power grid in a power distribution network area i; judging whether the branch current value is 0;
if the branch current value is 0; generating a branch power grid fault signal;
if the branch current value is 0; generating a branch power grid detection signal;
The voltage value in the main power grid is subjected to fluctuation detection, so that whether the voltage of each main power grid in a single power distribution network area is stable or not is further judged;
Step five: acquiring a trunk circuit resistance value in a power distribution network area i based on the branch power grid detection signal, and calculating and acquiring the trunk circuit current value in the power distribution network area i;
summing the branch current values in the main power grid to obtain a branch current total value in the main power grid; calculating to obtain a main circuit current deviation rate of a main circuit current total value and a main circuit current value in a main circuit power grid;
Comparing the main circuit current deviation rate with a main circuit current deviation rate threshold value to obtain a branch circuit power grid abnormal signal;
Step six: based on the branch grid anomaly signal; acquiring a branch resistance value in a branch power grid and a branch temperature value in the branch power grid, and acquiring a main circuit voltage value in a main circuit power grid; calculating and obtaining a branch current theoretical value in the branch power grid based on a temperature resistance linear model in the branch power grid;
judging whether the branch current value is in the branch current value range or not;
if the branch current value is in the branch current value range, generating a branch power grid stabilizing signal;
And if the branch current value is not in the branch current value range, generating a branch power grid fault signal.
Based on the foregoing embodiment, the present invention is specifically a fault locating method for a power distribution network with a distributed power source, including:
Step 001: dividing the total area of the power distribution network into areas and marking each power distribution network area as i; wherein i is 1, 2, 3 …;
step 002: obtaining the number of distributed power sources in a power distribution network area i, summing rated powers of the distributed power sources in the power distribution network area i, obtaining rated total power of the distributed power sources in the power distribution network area i, and marking the total power as Pi;
Step 003: calculating and obtaining a total load power value in a power distribution network area i, and marking the total load power value as FPi; and comparing the total load power FPi with the rated total power Pi;
If the total load power FPi is greater than the rated total power Pi, generating an overload risk signal; the total power of the loads required by the distributed power supplies in the power distribution network area of the distributed power network exceeds the rated total power of the distributed power supplies, and at the moment, the power distribution network of the loads required by the distributed power supplies needs to be redistributed so as to ensure that the distributed power supplies can supply power to the power distribution network area more stably;
If the total load power value FPi is smaller than or equal to the rated total power Pi, generating a verification load signal; at this point, step 004 is executed;
step 004: based on the load stabilization signal; acquiring working information in a shunt power grid in a power distribution network area i; wherein, branching power grid includes: a main circuit power grid and a branch circuit power grid; and marking the main grid as (i, m), and the branch grid as (i, m, n);
the working information includes: a main circuit voltage value GU, a main circuit current value GL and a branch circuit current value ZL;
The method comprises the steps of marking a main circuit voltage value in a main circuit power grid in a power distribution network area i as GU （i,m）;
Step 005: acquiring rated voltage of a distributed power supply in a power distribution network area i and marking the rated voltage as FUi;
By passing through Calculating to obtain a main circuit voltage fluctuation value BUV （i,m） in a main circuit power grid in a power distribution network area i;
Comparing the main circuit voltage fluctuation value BUV （i,m） with a preset main circuit voltage fluctuation threshold BUVy;
The plurality of road voltage fluctuation values BUV （i,m） are smaller than or equal to a preset road voltage fluctuation threshold BUVy; generating a main voltage stabilizing signal; the main circuit voltage is normal, and no abnormal fluctuation occurs;
The plurality of road voltage fluctuation values BUV （i,m） are greater than a preset plurality of road voltage fluctuation threshold BUVy; generating a main circuit voltage abnormal signal; indicating that the main circuit voltage has larger fluctuation in the working process, at this time, executing step 006;
The voltage value in the main power grid is subjected to fluctuation detection, so that whether the voltage of each main power grid in a single power distribution network area is stable or not is further judged;
step 006: based on the main voltage anomaly signal; obtaining a branch current value in a trunk power grid in a power distribution network area i, and marking the branch current value as ZL （i,m,n）;
judging whether the branch current value ZL （i,m,n） is 0 or not;
If the branch current value ZL （i,m,n） is 0; generating a branch power grid fault signal; the situation that the current value of the branch circuit is 0 shows that the branch circuit has abnormal faults, namely the positioning fault point is (i, m, n), namely the nth branch circuit under the mth main circuit in the ith power distribution network area has faults;
If the branch current value ZL （i,m,n） is 0; generating a branch power grid detection signal; step 007 is performed;
Step 007: based on the branch power grid detection signal, acquiring a trunk circuit resistance value GR （i,m） in a power distribution network area i, and acquiring a trunk circuit current value in the power distribution network area i through the calculation of a relation between voltage, resistance and current, and marking the trunk circuit current value as GL （i,m）;
Summing the branch current values ZL （i,m,n） in the main power grid m to obtain a branch current total value ZLz （i,m） in the main power grid m;
Calculating to obtain a main circuit current deviation rate IPC （i,m） of a main circuit current total value ZLz （i,m） and a main circuit current value GL （i,m） in the main circuit power grid m;
Wherein by means of Calculating to obtain a main current deviation rate IPC （i,m）;
Step 008: comparing the main current deviation rate IPC （i,m） with a main current deviation rate threshold IPCy;
The multiple path current deviation rate IPC （i,m） is smaller than or equal to the multiple path current deviation rate threshold IPCy; generating a branch power grid stabilizing signal; indicating that the branch power grid is stable;
The multiple path current deviation rate IPC （i,m） is greater than the multiple path current deviation rate threshold IPCy; generating a branch power grid abnormal signal; at this time, each branch in the branch power grid is detected; step 009 is performed;
Step 009: based on the branch grid anomaly signal; acquiring a branch resistance value ZR （i,m,n） in a branch power grid and a branch temperature value ZT （i,m,n） in the branch power grid, and acquiring a main circuit voltage value GU （i,m） in a main circuit power grid; calculating to obtain a branch current theoretical value ZLL （i,m,n） in the branch power grid based on a temperature resistance linear model in the branch power grid;
Judging whether the branch current value ZL （i,m,n） is in a branch current value range [ ZLx （i,m,n）,ZLy（i,m,n） ];
If the branch current value ZL （i,m,n） is in the branch current value range [ ZLx （i,m,n）,ZLy（i,m,n） ], generating a branch power grid stabilizing signal; indicating that the branch power grid is stable;
If the branch current value ZL （i,m,n） is not in the branch current value range [ ZLx （i,m,n）,ZLy（i,m,n） ], a branch power grid fault signal is generated, and the abnormal fault of the branch circuit is indicated, namely the locating fault point is (i, m, n), namely the nth branch under the mth main road in the ith power distribution network area is generated.
Wherein, in the branch current value field [ ZLx （i,m,n）,ZLy（i,m,n） ];； ; alpha and beta are both branch current fluctuation coefficient values; and alpha is less than 1 and less than beta.
The method comprises the steps of firstly, detecting the whole power distribution network area from a source by pre-detecting loads of distributed power sources in the power distribution network area so as to ensure normal operation of the whole power distribution network area; then, by carrying out fluctuation detection on the voltage values in the main power grid, whether the voltage of each main power grid in a single power distribution network area is stable or not is further judged;
Then, calculating the branch current in each main circuit, monitoring the self working temperature of each branch circuit based on the branch circuit resistance data at the temperature, calculating the deviation of the branch circuit current, judging whether the actual current has larger deviation under the influence of the self temperature, and indicating that the branch circuit power grid has faults when the actual current has larger deviation, so that the coordinates of the branch circuit power grid can be accurately obtained; to perform quick inspection repair; and the normal operation of the whole power distribution network area is better ensured.
In the third embodiment, based on the above embodiment, in the step of calculating the branch current theoretical value ZLL （i,m,n） based on the temperature resistance linear model, the following technical scheme is provided in this embodiment;
Firstly, constructing a temperature resistance linear model; the method comprises the following steps:
Acquiring historical data or experimental data in a branch power grid; the method comprises the steps of including data information in a plurality of groups of historical working states; the method comprises a historical current value SL, a rated resistance value SR of a branch power grid, a historical temperature value ST and a historical voltage value SU in the working process of the branch power grid;
By passing through Calculating and obtaining an influence coefficient gamma and a correction factor theta of a temperature value on a resistance value in a branch power grid;
Further obtaining a temperature resistance linear model of the branch power grid: ；
wherein U is the voltage value of the branch power grid; r is a rated resistance value in the branch power grid; t is a temperature value in the working process of the branch power grid;
L is the current value of the branch power grid in the working process, and the current value of the branch power grid changes along with the voltage value of the branch power grid, the rated resistance value of the branch power grid and the temperature value of the branch power grid;
Based on the method, a branch current theoretical value ZLL （i,m,n） in the branch power grid can be obtained through calculation of a temperature resistance linear model in the branch power grid; namely, the calculation mode of the theoretical value of the branch current is as follows: 。
in a fourth embodiment, referring to fig. 2, the present invention provides a fault location system of a power distribution network with a distributed power source, including:
region allocation module: the method comprises the steps of dividing a total area of a power distribution network into areas and marking each power distribution network area as i; obtaining the number of distributed power sources in a power distribution network area i, summing rated powers of the distributed power sources in the power distribution network area i, obtaining rated total power of the distributed power sources in the power distribution network area i, and marking the total power as Pi;
Load pre-checking module: the method is used for calculating and acquiring the total value of load power in the power distribution network area i and is marked as FPi; and comparing the total load power FPi with the rated total power Pi;
if the total load power FPi is greater than the rated total power Pi, generating an overload risk signal;
If the total load power value FPi is smaller than or equal to the rated total power Pi, generating a verification load signal;
Referring to fig. 3, the grid detection module: the system comprises a trunk detection unit and a branch detection unit;
A main road detection unit: the method comprises the steps of acquiring working information in a shunt power grid in a power distribution network area i; calculating to obtain a main circuit voltage fluctuation value in a main circuit power grid in a power distribution network area i;
comparing the main circuit voltage fluctuation value with a preset main circuit voltage fluctuation threshold value; obtaining a main circuit voltage abnormal signal;
A branch detection unit: the method comprises the steps of acquiring a branch current value in a trunk power grid in a power distribution network area i; judging whether the branch current value is 0;
if the branch current value is 0; generating a branch power grid fault signal;
if the branch current value is 0; generating a branch power grid detection signal;
Acquiring a trunk circuit resistance value in a power distribution network area i based on the branch power grid detection signal, and calculating and acquiring the trunk circuit current value in the power distribution network area i;
summing the branch current values in the main power grid to obtain a branch current total value in the main power grid; calculating to obtain a main circuit current deviation rate of a main circuit current total value and a main circuit current value in a main circuit power grid;
Comparing the main circuit current deviation rate with a main circuit current deviation rate threshold value to obtain a branch circuit power grid abnormal signal;
And a fault positioning module: based on the branch grid anomaly signal; acquiring a branch resistance value in a branch power grid and a branch temperature value in the branch power grid, and acquiring a main circuit voltage value in a main circuit power grid; calculating and obtaining a branch current theoretical value in the branch power grid based on a temperature resistance linear model in the branch power grid;
judging whether the branch current value is in the branch current value range or not;
if the branch current value is in the branch current value range, generating a branch power grid stabilizing signal;
And if the branch current value is not in the branch current value range, generating a branch power grid fault signal.
The method comprises the steps that the load of a distributed power supply in a power distribution network area is pre-detected, and the whole power distribution network area is detected from a source so as to ensure the normal operation of the whole power distribution network area; then, by carrying out fluctuation detection on the voltage values in the main power grid, whether the voltage of each main power grid in a single power distribution network area is stable or not is further judged; the branch current in each main circuit is calculated, the self working temperature of each branch in the branch power grid is monitored on the basis of the branch resistance data at the temperature, the deviation of the branch current is calculated, whether the actual current of the branch current has larger deviation under the influence of the self temperature can be further judged, and when the actual current has larger deviation, the fault of the branch power grid can be illustrated, and then the coordinates of the branch power grid can be accurately obtained; to perform quick inspection repair; the fault overhaul efficiency of the maintainer is improved, and the normal operation of the whole power distribution network area is better ensured.
The foregoing describes one embodiment of the present invention in detail, but the description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.
Claims (10)
1. The fault positioning method for the power distribution network with the distributed power supply is characterized by comprising the following steps of:
dividing the total area of the power distribution network into areas and marking each power distribution network area as i; obtaining the number of distributed power sources in a power distribution network area i, summing rated powers of the distributed power sources in the power distribution network area i, obtaining rated total power of the distributed power sources in the power distribution network area i, and marking the total power as Pi; calculating and obtaining a total load power value in a power distribution network area i, and marking the total load power value as FPi; and comparing the total load power FPi with the rated total power Pi; obtaining a verification load signal;
Based on the load stabilization signal; acquiring working information in a shunt power grid in a power distribution network area i; calculating to obtain a main circuit voltage fluctuation value in a main circuit power grid in a power distribution network area i; comparing the main circuit voltage fluctuation value with a preset main circuit voltage fluctuation threshold value; obtaining a main circuit voltage abnormal signal; acquiring a branch current value in a trunk power grid in a power distribution network area i; judging whether the branch current value is 0; obtaining a branch power grid detection signal or a branch power grid fault signal;
Based on the branch power grid detection signals, calculating and obtaining a main circuit current value in a power distribution network area i;
summing the branch current values in the main circuit power grid to obtain a branch current total value; calculating to obtain a main circuit current deviation rate of a main circuit current total value and a main circuit current value in a main circuit power grid; comparing the main circuit current deviation rate with a main circuit current deviation rate threshold value to obtain a branch circuit power grid abnormal signal;
Based on the branch grid anomaly signal; acquiring a branch resistance value in a branch power grid and a branch temperature value in the branch power grid, and acquiring a main circuit voltage value in a main circuit power grid; calculating and obtaining a branch current theoretical value in the branch power grid based on a temperature resistance linear model in the branch power grid;
Judging whether the branch current value is in the branch current value range or not; and obtaining a branch power grid stable signal or a branch power grid fault signal.
2. A method of fault localization of a power distribution network with distributed power supply according to claim 1, characterized in that the total load power value FPi is compared with the nominal total power Pi;
if the total load power FPi is greater than the rated total power Pi, generating an overload risk signal;
And if the total load power value FPi is smaller than or equal to the rated total power Pi, generating a verification load signal.
3. The fault location method for a power distribution network with a distributed power supply according to claim 1, wherein the obtaining mode of the trunk voltage fluctuation value is as follows:
Acquiring working information in a shunt power grid in a power distribution network area i; wherein, branching power grid includes: a main circuit power grid and a branch circuit power grid; and marking the main grid as (i, m), and the branch grid as (i, m, n);
the working information includes: a main circuit voltage value GU, a main circuit current value GL and a branch circuit current value ZL;
Marking a main circuit voltage value in a main circuit power grid in a power distribution network area i as GU （i,m）;
Acquiring rated voltage of a distributed power supply in a power distribution network area i and marking the rated voltage as FUi;
By passing through And calculating to obtain a main circuit voltage fluctuation value BUV （i,m） in a main circuit power grid in the power distribution network area i.
4. The fault location method of a power distribution network having a distributed power source according to claim 1, wherein the main voltage fluctuation value is compared with a preset main voltage fluctuation threshold;
A plurality of road voltage fluctuation values are smaller than or equal to a preset main road voltage fluctuation threshold value; generating a main voltage stabilizing signal;
the voltage fluctuation values of a plurality of paths are larger than a preset trunk voltage fluctuation threshold; a main voltage anomaly signal is generated.
5. The fault location method for a power distribution network having a distributed power source according to claim 1, wherein if the branch current value is 0; generating a branch power grid fault signal;
if the branch current value is 0; a branch grid detection signal is generated.
6. The fault location method for a power distribution network with distributed power supply according to claim 1, wherein the main current deviation rate is obtained by the following steps:
Acquiring a trunk circuit resistance value GR （i,m） in a power distribution network area i, calculating and acquiring a trunk circuit current value in the power distribution network area i through the relation between voltage, resistance and current, and marking the trunk circuit current value as GL （i,m）;
Summing the branch current values ZL （i,m,n） in the main power grid m to obtain a branch current total value ZLz （i,m） in the main power grid m;
By passing through And calculating to obtain a main circuit current deviation rate IPC （i,m） of the main circuit current total value ZLz （i,m） and the main circuit current value GL （i,m） in the main circuit power grid m.
7. A method of fault location for a power distribution network having a distributed power supply as claimed in claim 1 wherein the mains current bias rate is compared with a mains current bias rate threshold;
The deviation rate of the current in a plurality of paths is smaller than or equal to the deviation rate threshold value of the current in a main path; generating a branch power grid stabilizing signal;
The current deviation rate of a plurality of paths is larger than the current deviation rate threshold value of a plurality of paths; a branch grid anomaly signal is generated.
8. The fault location method of a power distribution network having a distributed power source of claim 1, wherein determining whether the branch current value is within the branch current value range;
if the branch current value is in the branch current value range, generating a branch power grid stabilizing signal;
And if the branch current value is not in the branch current value range, generating a branch power grid fault signal.
9. The fault locating method for a power distribution network with a distributed power supply according to claim 1, wherein the temperature resistance linear model is constructed in the following manner:
Acquiring historical data or experimental data in a branch power grid; the method comprises the steps of including data information in a plurality of groups of historical working states; the method comprises a historical current value SL, a rated resistance value SR of a branch power grid, a historical temperature value ST and a historical voltage value SU in the working process of the branch power grid;
By passing through Calculating and obtaining an influence coefficient gamma and a correction factor theta of a temperature value on a resistance value in a branch power grid;
The temperature resistance linear model of the branch power grid can be obtained: ；
Wherein U is the voltage value of the branch power grid; r is a rated resistance value in the branch power grid; t is a temperature value in the working process of the branch power grid; l is the current value of the branch power grid in the working process.
10. A fault location system for a power distribution network having a distributed power source, comprising:
region allocation module: the method comprises the steps of dividing a total area of a power distribution network into areas and marking each power distribution network area as i; obtaining the number of distributed power sources in a power distribution network area i, summing rated powers of the distributed power sources in the power distribution network area i, obtaining rated total power of the distributed power sources in the power distribution network area i, and marking the total power as Pi;
Load pre-checking module: the method is used for calculating and acquiring the total value of load power in the power distribution network area i and is marked as FPi; and comparing the total load power FPi with the rated total power Pi; obtaining a verification load signal;
the power grid detection module: the system comprises a trunk detection unit and a branch detection unit;
A main road detection unit: the method comprises the steps of acquiring working information in a shunt power grid in a power distribution network area i; calculating to obtain a main circuit voltage fluctuation value in a main circuit power grid in a power distribution network area i;
comparing the main circuit voltage fluctuation value with a preset main circuit voltage fluctuation threshold value; obtaining a main circuit voltage abnormal signal;
A branch detection unit: the method comprises the steps of acquiring a branch current value in a trunk power grid in a power distribution network area i; judging whether the branch current value is 0; obtaining a branch power grid fault signal or a branch power grid detection signal;
Based on the branch power grid detection signals, calculating and obtaining a main circuit current value in a power distribution network area i;
summing the branch current values in the main circuit power grid to obtain a branch current total value; calculating to obtain a main circuit current deviation rate of a main circuit current total value and a main circuit current value in a main circuit power grid; comparing the main circuit current deviation rate with a main circuit current deviation rate threshold value to obtain a branch circuit power grid abnormal signal;
And a fault positioning module: based on the branch grid anomaly signal; acquiring a branch resistance value in a branch power grid and a branch temperature value in the branch power grid, and acquiring a main circuit voltage value in a main circuit power grid; calculating and obtaining a branch current theoretical value in the branch power grid based on a temperature resistance linear model in the branch power grid;
Judging whether the branch current value is in the branch current value range or not; and obtaining a branch power grid stable signal or a branch power grid fault signal.
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