CN105137337B - A kind of method for judging scheduling system line power-off telegram in reply in time - Google Patents

Abstract

The invention discloses a method for timely judging power failure and power recovery of a dispatching system line, which comprises the following steps: preset power-on threshold and drift interval; monitor the remote signal value of the circuit breaker on the line; monitor the electrical parameter pair of the line; If the remote signaling value of the device jumps, it is judged whether there is at least one electrical parameter pair before the remote signaling value jump corresponds to the level value before the remote signaling value jump, and there is at least one electrical parameter pair after the remote signaling value jumps. The parameter pair corresponds to the level value after the jump of the remote signal value, and judges whether the line is powered off or restored according to the judgment result. The present invention synchronously judges the jump information of the remote signal value of the circuit breaker on the line and the change of the electrical parameters on the target line before and after the jump of the remote signal value. The electrical parameters verify the judgment of the change, which can ensure the accuracy of the judgment of the power failure and power restoration of the target line.

Description

A method for timely judging power failure and power restoration of dispatching system lines

technical field

The invention relates to the technical field of power grid monitoring, in particular to a method for timely judging power failure and power restoration of dispatching system lines.

Background technique

Timely determination of line outages in the dispatching system can reflect the operating status of the power grid in a certain area, and provide sufficient support for timely fault finding, fault analysis, and fault isolation, which can further improve the quality of power grid data. At present, the provinces, cities and local dispatchers have directly connected the status of 220kV voltage lines to the monitoring platform of the State Grid Corporation of China. However, there is no direct access to the status of 110kV voltage lines. Actively upload to the State Grid.

At present, before the ground dispatching system will automatically report the power outage and power recovery information of the 110kV voltage level line, the dispatcher needs to check the dispatch data or contact the power repair department on site to confirm whether the line power outage or power recovery actually occurs. If it actually occurs, After the dispatcher confirms, the dispatching system saves the status information and then sends it to the State Grid Corporation of China. If there is no line power failure or power recovery information, this information is a false report information of the dispatching system, and the dispatching reason will ignore this information. During this process, if the dispatcher fails to confirm in time, it will cause a delay in uploading, the timeliness of the data will be affected, and it will not be possible to conduct real-time analysis on the status of the regional power grid at a certain moment. The integrity of the data is affected by the power failure or power recovery information, and the power failure or power recovery information cannot be sent to the State Grid Corporation of China.

Contents of the invention

Based on the technical problems existing in the background technology, the present invention proposes a method for timely judging the power failure and restoration of the line in the dispatching system.

A kind of method that the present invention proposes in time judges the dispatching system line power failure restoration, comprises the following steps:

Preset power-on threshold and drift interval;

Monitor the remote signaling value of the circuit breaker on the line;

Monitoring electrical parameter pairs of the line, each electrical parameter pair is composed of an electrical parameter at the first end of the line and an electrical parameter at the second end of the line;

When the remote signal value of the circuit breaker jumps, the electrical parameter pair before the remote signal value jump and the electrical parameter pair after the remote signal value jump are compared with the power-on threshold and the drifting interval to determine whether there is at least one remote signal value. The electrical parameter pair before the value jump corresponds to the level value before the remote signaling value jump, and at least one electrical parameter pair after the remote signaling value jump corresponds to the level value after the remote signaling value jump, And according to the judgment result, it is judged that the line is powered off or resumed.

Preferably, the electrical parameter can be one or more of voltage, current, active power and reactive power at both ends of the line.

Preferably, each pair of electrical parameters consists of the same type of electrical parameters at both ends of the line.

Preferably, the pair of electrical parameters includes current, active power and reactive power at both ends of the line.

Preferably, when the remote signaling value of the circuit breaker jumps from a high level to a low level, it is judged whether at least one electrical parameter is greater than the corresponding power-on threshold before the remote signaling value jumps, and at least one electrical parameter is greater than the corresponding power-on threshold. After the remote signal value jumps, it is located in the corresponding drifting range. If it is, it is judged that the line is powered off; if not, the remote signal value and the electrical parameter pair of the line are re-monitored;

When the remote signal value of the circuit breaker jumps from low level to high level, it is judged whether at least one electrical parameter pair is in the corresponding drifting range before the remote signal value jumps, and at least one electrical parameter After the signal value jumps and is greater than the corresponding power-on threshold, if it is, it is judged that the line is restored; if not, the remote signal value and the electrical parameter pair of the line are re-monitored.

Preferably, circuit breakers are respectively provided at both ends of the line. When the remote signaling value of not less than one circuit breaker jumps, the current level value of the remote signaling value of the two circuit breakers is judged. If not less than one circuit breaker is currently in low level, it is judged that the remote signaling value of the circuit breaker jumps from high level to low level; transition to a high level.

Preferably, the power-on thresholds corresponding to the voltage, current, active power and reactive power at both ends of the line are ekV, eA, eMW and eMVar respectively, 3≤e≤7.

Preferably, the drift intervals corresponding to the voltage, current, active power and reactive power at both ends of the line are all [-a, a], 0≤a≤1, and a is the standard unit corresponding to voltage, current, active power and reactive power They are 1kV, 1A, 1MW and 1MVar respectively.

The present invention judges the power-off and power-off status of the line by synchronously judging the circuit breaker remote signal value jump information on the line and the electrical parameter change situation on the target line before and after the remote signal value jump. First, judge the jump information of the remote signal value of the circuit breaker, estimate the power failure and restoration of the line, and then verify the judgment through the change of the electrical parameters of the line, so as to ensure the accuracy of the judgment of the power failure and restoration of the target line .

Through the method for timely judging power outage and power recovery of dispatching system lines provided by the present invention, timely judgment of power outage and power restoration information of lines in the dispatching system can be realized automatically, and data files automatically generated by the determined power outage or power restoration information program are first uploaded to The provincial survey is uploaded to the national survey, which avoids human intervention, helps to ensure the timeliness, correctness and integrity of data uploading, provides a strong guarantee for the establishment of a strong power grid, and is conducive to improving the efficiency of power grid operation. And the present invention is applicable to dispatching systems of different manufacturers.

Description of drawings

Fig. 1 is a flow chart of a method for timely judging the power failure and restoration of the dispatching system line proposed by the present invention.

detailed description

With reference to Fig. 1, a kind of method that the present invention proposes in time judges the dispatching system line power failure recovery, comprises the following steps:

The first step is to preset the power-on threshold and drift interval.

The second step is to monitor the remote signaling value of the circuit breaker on the line.

The third step is to monitor the electrical parameter pairs of the line, each electrical parameter pair is composed of an electrical parameter at the first end of the line and an electrical parameter at the second end of the line. The electrical parameter can be one or more of voltage, current, active power and reactive power at both ends of the line, and each electrical parameter has a corresponding power-on threshold and drifting interval. During specific implementation, in order to improve the accuracy of judging power failure and power recovery of the line, it may be further defined that each pair of electrical parameters is composed of similar electrical parameters at both ends of the line. For example, in this embodiment, the electrical parameter pair includes the voltage, current, active power and reactive power at both ends of the line, and the power-on thresholds corresponding to the voltage, current, active power and reactive power at both ends of the line are 5kV, 5A, 5MW and 5MVar respectively , it can be seen that the value of the power-on threshold corresponding to voltage, current, active power and reactive power is 5, but the corresponding standard units are different according to the data type. During specific implementation, the power-on thresholds corresponding to the voltage, current, active power and reactive power at both ends of the line are ekV, eA, eMW and eMVar respectively, 3≤e≤7. Similarly, the drift intervals corresponding to the voltage, current, active power and reactive power at both ends of the line are [-a, a], 0≤a≤1, and a is the standard unit corresponding to voltage, current, active power and reactive power They are 1kV, 1A, 1MW and 1MVar respectively; the value of a is not greater than 1, which can avoid misjudgment of the drifting value of the electrical parameters due to the large value of a.

In this embodiment, voltage, current, active power and reactive power all refer to absolute values, so the drifting range is actually [0, a].

Step 4. When the remote signal value of the circuit breaker jumps, compare the electrical parameter pair before the remote signal value jump and the electrical parameter pair after the remote signal value jump with the power-on threshold and the drifting range to determine whether it is at least There is one electrical parameter pair before the remote signaling value jump corresponds to the level value before the remote signaling value jump, and at least one electrical parameter pair after the remote signaling value jump corresponds to the level value after the remote signaling value jump Corresponds to the corresponding value, and judges whether the line is powered off or restored according to the judgment result.

The setting of the circuit breaker on the line is to detect the power failure and restoration of the line, but it is difficult to ensure that the circuit breaker will not fail all the time. Therefore, while monitoring the remote signal value of the circuit breaker, the electrical parameters at both ends of the line are also monitored. Further inferring the power failure and restoration of the line according to the electrical parameters is beneficial to ensure the accuracy of the judgment of the power failure and restoration of the line. In order to improve the accuracy of line monitoring, a circuit breaker is usually installed at opposite ends of the line. It is greater than the power-on threshold; in the case of power failure of the line, the remote signal value of at least one circuit breaker is at a low level, and the electrical parameters on the line should be within the zero range.

In this embodiment, first judge the jumping direction of the remote signal value of the circuit breaker according to the remote signal value of the two circuit breakers, and predict the power-off and power-off state of the line, so as to predict the electrical parameters on the line according to the pre-judgment result. Select the power-on threshold or the drifting interval as the reference standard, and judge whether the direction of the change of the electrical parameters is consistent with the jump direction of the remote signal value. When the jump information of the remote signaling value of the circuit breaker is obtained, the current level value of the remote signaling value of the two circuit breakers is judged. The level jumps to a low level; if the remote signaling values of the two circuit breakers are both at a high level, it is determined that the remote signaling value of the circuit breaker jumps from a low level to a high level.

Specifically, when the remote signaling value of the circuit breaker jumps from a high level to a low level, it is judged whether there is at least one electrical parameter pair greater than the corresponding power-on threshold before the remote signaling value jumps, and at least one electrical parameter pair After the remote signal value jumps, it is located in the corresponding drifting interval.

In this embodiment, the voltage, current, active power and reactive power at the first end of the line are denoted as Ui, Ii, Pi and Qi respectively, and the voltage, current, active power and reactive power at the second end of the line are denoted as Uj, Ij, Pj respectively and Qj. Then at least one electrical parameter pair is greater than the corresponding power-on threshold before the remote signal value jumps, and at least one electrical parameter pair is located in the corresponding drifting range after the remote signal value jumps. The above conditions can be expressed by the following mathematical formula:

Before the remote signaling value jumps: (Ii＞5&Ij＞5)||(Pi＞5&Pj＞5)||(Qi＞5&Qj＞5)

After the remote signaling value jumps: (|Ii|＜a&|Ij|＜a)||(|Pi|＜a&|Pj|＜a)

When the remote signaling value jumps from high level to low level, if the current, active power, and reactive power on the line satisfy the above two formulas before and after the remote signaling value jumps, it is judged that the line is powered off; Two formulas, re-monitor the remote signal value and the electrical parameter pair of the line.

In this embodiment, each electrical parameter pair is limited to be composed of similar electrical parameters at both ends of the line, in order to improve the accuracy of the judgment of power failure and power recovery of the line. During specific implementation, the above two parameters can also be replaced by:

Before remote signaling value jump: (Ii＞5||Pi＞5||Qi＞5)&(Ij＞5||Pj＞5||Qj＞5)

After the remote signaling value jumps: (|Ii|＜a&|Pi|＜a)||(|Ij|＜a&|Pj|＜a)

Since the voltage and the current value are correlated, in this embodiment, the voltage is not judged to avoid redundant operations and reduce the judgment efficiency. In the same way, since the reactive power data is meaningless when the line is powered off, when the remote signal value is low, the reactive power on the line is not judged.

When the remote signal value of the circuit breaker jumps from low level to high level, it is judged whether at least one electrical parameter pair is in the corresponding drifting range before the remote signal value jumps, and at least one electrical parameter After the signal value jumps, it is greater than the corresponding power-on threshold. The above conditions can be expressed in the following mathematical formula:

Before the remote signaling value jumps: (|Ii|＜a&|Ij|＜a)||(|Pi|＜a&|Pj|＜a)

After the remote signaling value jumps: (Ii＞5&Ij＞5)||(Pi＞5&Pj＞5)||(Qi＞5&Qj＞5)

When the remote signal value jumps from a low level to a high level, if the current, active power and reactive power on the line satisfy the above two formulas before and after the remote signal value jumps, it is judged that the line is restored; if not, Then re-monitor the remote signal value and the electrical parameter pair of the line. In specific implementation, the above two parameters can also be replaced by:

Before the remote signaling value jumps: (|Ii|＜a&|Pi|＜a)||(|Ij|＜a&|Pj|＜a)

After the remote signaling value jumps: (Ii＞5||Pi＞5||Qi＞5)&(Ij＞5||Pj＞5||Qj＞5)

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, any person familiar with the technical field within the technical scope disclosed in the present invention, according to the technical solution of the present invention Any equivalent replacement or change of the inventive concepts thereof shall fall within the protection scope of the present invention.

Claims (6)

1. A method for timely judging dispatching system circuit power outage recovery, is characterized in that, comprises the following steps: Preset power-on threshold and drift interval; Monitor the remote signaling value of the circuit breaker on the line; Monitoring electrical parameter pairs of the line, each electrical parameter pair is composed of an electrical parameter at the first end of the line and an electrical parameter at the second end of the line; When the remote signal value of the circuit breaker jumps, the electrical parameter pair before the remote signal value jump and the electrical parameter pair after the remote signal value jump are compared with the power-on threshold and the drifting range to determine whether there is at least one The electrical parameter pair before the remote signal value jump corresponds to the level value before the remote signal value jump, and at least one electrical parameter pair after the remote signal value jump corresponds to the level value after the remote signal value jump Corresponding, and according to the judgment result, it is judged that the line is powered off or restored; Specifically, when the remote signaling value of the circuit breaker jumps from high level to low level, it is judged whether at least one electrical parameter pair is greater than the corresponding power-on threshold before the remote signaling value jumps, and at least one electrical parameter After the remote signal value jumps, it is located in the corresponding drifting interval. If yes, it is judged that the line is powered off; if not, the remote signal value and the electrical parameter pair of the line are re-monitored; When the remote signal value of the circuit breaker jumps from low level to high level, it is judged whether at least one electrical parameter pair is in the corresponding drifting range before the remote signal value jumps, and at least one electrical parameter After the signal value jumps and is greater than the corresponding power-on threshold, if it is, it is judged that the line is powered on; if not, the remote signal value and the electrical parameter pair of the line are re-monitored; Among them, for the judgment that the remote signaling value of the circuit breaker jumps from high level to low level or the remote signaling value of the circuit breaker jumps from low level to high level, by setting circuit breakers at both ends of the line, When the remote signaling value of not less than one circuit breaker jumps, the current level value of the remote signaling value of the two circuit breakers is judged; if not less than one circuit breaker is currently at a low level, the remote signaling value of the circuit breaker is judged Jump from high level to low level; if the remote signaling values of the two circuit breakers are both at high level, it is determined that the remote signaling value of the circuit breaker has jumped from low level to high level. 2. The method for timely judging the power failure and restoration of the dispatching system line as claimed in claim 1, wherein the electrical parameter can be one or more of voltage, current, active power and reactive power at both ends of the line. 3. The method for timely judging power failure and power recovery of dispatching system lines as claimed in claim 2, characterized in that each pair of electrical parameters is composed of similar electrical parameters at both ends of the line. 4. The method for timely judging the power failure and power restoration of the dispatching system line as claimed in claim 3, wherein the electrical parameter pair includes current, active power and reactive power at both ends of the line. 5. The method for timely judging the power-off and power-off of dispatching system lines as claimed in claim 1, wherein the power-on thresholds corresponding to the voltage at both ends of the line, current, active power and reactive power are respectively ekV, eA, eMW and eMVar, 3≤e≤7. 6. The method for timely judging the power failure and power recovery of the dispatching system line as claimed in claim 1, wherein the drift intervals corresponding to the voltage, current, active power and reactive power at both ends of the line are [-a, a] , 0≤a≤1, and the standard units corresponding to a and voltage, current, active power and reactive power are 1kV, 1A, 1MW and 1MVar respectively.