JPH09182319A - Power flow supervisory system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a system for supervising the power flow depending on the operating conditions of a system and for supervising a plurality of power facilities collectively. SOLUTION: The power flow supervisory system comprises means 2 for taking in the power flow value of a power system through a remote supervisory controller 1, means 5 for calculating a plurality of allowable power flows based on the operating conditions of system, and means 6 for selecting the minimum allowable power flow. The power flow supervisory system further comprises means 3 for making a decision whether a power flow value being taken in through the means 2 exceeds the minimum allowable power flow selected by the means 6 or not and means 4 for delivering an alarm when the minimum allowable power flow is exceeded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power system power flow monitoring device for monitoring power flow in a power system.

[0002]

2. Description of the Related Art Generally, in a power system power flow monitoring device, the amount of power supplied to the power facility (tidal current) is a permissible value (tidal current limit value) so that the power equipment constituting the electric power system is not overloaded. ) Is monitored so as not to deviate from the above. This allowable value of power flow is determined based on the durability of the power equipment. For example, the power flow allowable value is a value obtained by multiplying the allowable value specific to the equipment, which is derived from the heat capacity of the power transmission line or the transformer, by a certain factor. In this case, the power flow allowable value is set by input from the man-machine interface device. Moreover, the power flow allowable value set is one for each electric power facility, and the power flow is monitored with respect to the one power flow allowable value.

FIG. 7 is a block diagram of such a conventional power system power flow monitoring device. The power flow of the electric power system is input to the measurement value capturing means 2 of the electric power system power flow monitoring device 16 via the remote monitoring control device 1. The tidal current value fetched by the measured value fetching means 2 is inputted to the tidal current deviation detecting means 3 and compared with the allowable tidal current value. The power flow allowable value is preset.

When the measured tidal current value deviates from the allowable tidal current value, the tidal current deviation detecting means 3 activates the alarm means 4, and the man-machine interface device 10 is used to notify the operator. Alarm is issued. The operator will be informed by the warning that the power flow has deviated from the allowable value, and appropriate action will be taken.

[0005]

However, in an actual electric power system, there are a plurality of allowable power flow values for electric power equipment constituting the electric power system. For example, when a separated system occurs due to the disconnection of the route of a power transmission line or the like, a system stabilizing device SSC (System Stabilizing Controller) operates. In such a case, it is appropriate to use a power flow allowable value that takes into account generator control and load control by the operation of the system stabilizer.

On the other hand, it is appropriate to use the power flow allowable value in consideration of the relay operation for the equipment to be protected by the relay. For example, when a failure of the power system is assumed and the operation of the protection device of various systems against the failure is considered, such as relay operation of a transmission line protection relay or a bus protection relay, there are multiple system operating conditions. However, there is a power flow allowable value corresponding to each. Therefore, the power system may not be operated smoothly with only one power flow allowable value.

[0007] Further, in the conventional system, since the facility has a fixed allowable value, the transmission line that normally operates two lines will have a one-line operation due to a system failure or the like. Even if the power flow allowable value is halved, the monitoring will be performed using the power flow allowable value when operating two lines. For this reason, the deviation of the tidal current could not be detected, which could adversely affect the power equipment. The same thing can be said for such a problem with a transformer.

As described above, the conventional system cannot follow the change in the power flow allowable value when the power system is changed due to the change of the system operation or the system failure, and the operation management must be performed by the human system. Therefore, in the worst case, there is a possibility that the operation of the power system may be adversely affected.

In addition to the recent trend of power system loop operation and heavy power flow, in addition to monitoring the power flow value of each electric power system, the total value of each electric power system is managed in order to collectively manage a plurality of electric power systems. The need for tidal current monitoring is emerging. That is, when the loop system operation is performed in the power system, the allowable values are satisfied for the individual facilities of the two transmission lines, but when this is changed to radial operation, one transmission line is overloaded. There is a case where the power flow causes an obstacle to the operation of the power system.

An object of the present invention is to provide a power system power flow monitoring device which enables power flow monitoring corresponding to system operating conditions and can collectively monitor a plurality of power facilities.

[0011]

According to a first aspect of the present invention, a measured value fetching means for fetching a power flow value of a power system via a remote monitoring and control device, and a plurality of allowable power flow values are calculated based on system operation conditions. Allowable flow value calculating means, minimum allowable value determining means for selecting the minimum value of the plurality of allowable power flow values calculated by the allowable power flow value calculating means, and minimum allowable value determining means for the power flow value captured by the measurement value capturing means The power flow deviation detecting means for determining whether or not the minimum power flow allowable value selected in (3) is exceeded, and the alarm output means for issuing an alarm when the measured power flow value deviates from the minimum power flow allowable value.

According to the first aspect of the present invention, the strictest (smallest) allowable value is selected from a plurality of allowable power flow values corresponding to the system operating conditions, and the allowable power flow value is used in the monitoring function.

According to a second aspect of the present invention, in the first aspect of the invention, use / non-use of the system operating condition for setting use / non-use of the minimum power flow allowable value selected by the minimum allowable value determining means for each system operating condition / It is provided with additional non-use setting means.

According to the second aspect of the invention, in addition to the operation of the first aspect of the invention, when the system operation condition use / non-use setting means is activated by the man-machine interface device, the power flow allowable value corresponding to the system operation condition is met. , Use / not use is set for each system operation condition. As a result, the power flow allowable value set as unused is not used.

According to a third aspect of the present invention, in the first aspect of the present invention, a condition change detecting means for detecting a change in the number of lines of the power system is provided, and when the change detecting means detects a change in the number of lines, the flow is allowed. The value calculation means is adapted to calculate a plurality of power flow allowable values corresponding to the number of lines.

According to the invention of claim 3, in addition to the operation of the invention of claim 1, the allowable power flow value is calculated when the number of lines is changed, and the calculated allowable power flow value is used.

According to a fourth aspect of the present invention, the measured value fetching means for fetching the power flow value of the power system via the remote monitoring and control device, and the power facility to be collectively monitored among a plurality of power facilities constituting the power system. And a collective monitoring target equipment setting means for setting the allowable power flow value and a tidal current deviation detection for determining whether or not the tidal current value captured by the measurement value capturing means exceeds the allowable power flow value set by the collective monitoring target equipment setting means. And means for outputting an alarm when the measured power flow value deviates from the minimum allowable power flow value.

According to the fourth aspect of the present invention, when the man-machine interface device activates the collective monitoring target facility setting means, a plurality of facility collective (group) monitoring is set for a plurality of electric power facilities. That is, the power system equipment to be included in the group is selected, and the power flow allowable value for the group is set. Thereby, it is monitored whether the total power flow value of the electric power equipment in the group exceeds the power flow allowable value.

[0019]

Embodiments of the present invention will be described below. FIG. 1 is a block diagram showing a first embodiment of the present invention. The first embodiment is different from the conventional example shown in FIG. 7 in that the power flow allowable value calculating means 5 calculates a plurality of power flow allowable values based on the system operating conditions, and the power flow allowable value calculating means 5 calculates the power flow allowable value. The minimum allowable value determining means 6 for selecting the minimum value of the plurality of allowable power flow values is additionally provided.

In FIG. 1, the power flow of the power system is input to the measured value fetching means 2 of the power system power flow monitoring device 16 via the remote monitoring control device 1. Measured value acquisition means 2
The power flow value taken in by is input to the power flow deviation detection means 3 and compared therewith with the power flow allowable value selected by the minimum allowable value determination means.

A plurality of allowable power flow values are calculated by the allowable power flow value calculating means 5 based on the system operating conditions input via the man-machine interface device 10, and among the calculated allowable power flow values. The smallest allowable value is selected by the minimum allowable value judging means 6 and input to the tidal current deviation detecting means 3. When the measured power flow value deviates from the power flow allowable value, the power flow deviation detection means 3 activates the alarm means 4 and issues an alarm to the operator via the man-machine interface device 10. Occur.

That is, in the power flow monitoring apparatus according to the first embodiment, the power flow allowable value calculating means 5 causes
As shown below, a plurality of (three) power flow allowable values are calculated for one electric power facility. (1) Allowable value when SSC is used Allowable value when SSC is used = Total target that can be controlled by electric power + Characteristic constant of rising side × Frequency fluctuation side of fluctuation × System capacity (A) Allowable value when using SSC calculated by this formula (A) Value is SS
C This is the power flow allowable value of the equipment to be protected. Assuming that a route disconnection will occur in the power system, considering the controllable amount by the SSC device, we show how much power can flow from the isolated system to this system. (2) Allowable value when SSC is excluded Allowable value when SSC is excluded = Characteristic constant of rising side × Frequency of frequency rising side × System capacity (B) The allowable value when excluding SSC calculated by the formula (B) is SS.
C This is a facility allowable value that is not subject to protection. When a route disconnection occurs in the electric power system, this electric power equipment is not controlled by the SSC device, so the total electric controllable target is deleted from the formula (A). (3) Relay constraint allowable value Relay constraint allowable value = Power flow value at which the transmission line overload protection relay operates (C) The relay constraint allowable value represented by the formula (C) is a protection target of the transmission line overload protection relay. The power flow value at which the relay operates is registered in the equipment as the equipment allowable value.

Next, the minimum allowable value determining means 6 inputs a plurality of allowable power flow values calculated by the allowable power flow value calculating means 5 in this manner, and the strictest allowable value is selected from the plurality of allowable power flow values. Select and use this as the comparison target tolerance. Then, the measured value fetched by the measured value fetching means 2 and the comparison target allowable value are compared by the tidal current deviation detecting means 3 to determine whether or not there is a deviation.

As described above, according to the first embodiment of the present invention, a power system failure is assumed for one power system facility, and various system stabilizers and relay protection devices against this failure are assumed. Since there are a plurality of power flow allowable values in consideration of the operation, it is possible to perform monitoring corresponding to various system operation conditions.

As described above, in the first embodiment, the power flow allowable value of the electric power equipment restricted by the plurality of system operating conditions is calculated, and the strictest (smallest) allowable value is selected from the plurality of power flow allowable values. Judge the deviation of the tidal current. This allows
It enables monitoring corresponding to various system operating conditions.

Next, FIG. 2 shows a second embodiment of the present invention. In the second embodiment, a system operation use / non-use setting means 7 is added to the first embodiment shown in FIG. Since other configurations are the same as those of the first embodiment shown in FIG. 1, the same elements are denoted by the same reference numerals and the description thereof will be omitted.

FIG. 3 shows a screen for setting use and non-use of the power flow allowable values calculated by the power flow allowable value calculating means 5. This screen is displayed on the display device of the man-machine interface device 10 by the system operation condition use / non-use setting means 7.

As shown in FIG. 3, the system operating condition use / non-use setting means 7 is for monitoring the equipment to be monitored, the calculation setting pattern,
Conditional killing specification and power flow allowable value are displayed on the screen,
The operator sets the use or non-use of the system operation condition by inputting the condition killing designation part.

For example, when the work of the relay protection device is stopped, the power flow allowable value according to the system operating condition shown by the above-mentioned formula (C) is not used. As a result, the minimum permissible value determining means 6 excludes the power flow allowable value represented by the formula (C) from the determination condition, and selects the strictest (smallest) allowable value from the remaining power flow allowable values. Thereby, the tidal current deviation detecting means 3 monitors the tidal current.

As described above, according to the second embodiment,
Since the use / non-use of the system operation condition is selected, the power flow can be monitored with the power flow allowable value that matches the system operation state at that time.

Next, FIG. 4 shows a third embodiment of the present invention. In the fourth embodiment, a condition change detecting means 8 for detecting a change in the number of lines in the power system is added to the first embodiment shown in FIG. 1, and the change detecting means 8 is connected to the line. When a change in the number is detected, the power flow allowable value calculation means 5 calculates a plurality of power flow allowable values corresponding to the number of lines. Other configurations are the same as those of the first embodiment shown in FIG. 1, and therefore, the same components are denoted by the same reference symbols and description thereof will be omitted.

The state change detecting means 8 detects the state of the switch of the electric power system through the remote monitoring and control device 1, and detects the change in the number of lines of the electric power system. Now, assuming that the state change detection means 8 detects a state change (state change) of the circuit breaker CB, the state change output means 8 activates the power flow allowable value calculation means 5. That is,
The power flow allowable value is calculated in the state of the power system at the time when the state change occurs. Then, the minimum allowable value determining means 6 selects the minimum value of the allowable power flow values calculated by the power flow four-leaf value calculating means 5 and determines the allowable power flow value. In this case, the electric power equipment related to the number of lines is the calculation target, and is applied, for example, when calculating the following allowable power flow value. (4) Permitting continuous operation of transmission line = Σ operating transmission line capacity × power factor × overload factor (D) (5) Allowing constant operation of transformer = Σ operating transformer capacity × power factor × overload factor (E) The Σ working transmission line capacity and the Σ working transformer capacity in the calculation formulas in the above formulas (4) and (5) indicate the facility capacity currently in operation. Therefore, when the number of operating facilities increases or decreases, the power flow allowable value is calculated each time.

As described above, according to the third embodiment, the power flow allowable value is calculated every time a change in the number of lines (change in the state of the transmission line or the breaker of the transformer) is detected. When the operation is changed or the system fails, the human system does not manage the system, and the power flow can be monitored according to the power system state at that time.

As described above, in the third embodiment, the change in the number of lines of the power system equipment (transmission line, transformer) is detected,
Since the power flow allowable value is calculated when the number of lines changes and the power flow monitoring corresponding to the state change of the power system is performed, the power flow allowable value corresponding to the state change of the power system can be recalculated.

Next, FIG. 5 shows a fourth embodiment of the present invention. The fourth embodiment is different from the conventional example shown in FIG. 7 in that, among a plurality of electric power equipments constituting an electric power system, the electric power equipments to be collectively monitored and a batch for setting a power flow allowable value thereof. The monitoring target equipment setting means 9 is additionally provided.

The power flow of the power system is input to the measured value fetching means 2 of the power system power flow monitoring device 16 via the remote monitoring control device 1. The tidal current value fetched by the measured value fetching means 2 is inputted to the tidal current deviation detecting means 3 and compared with the allowable tidal current value. The allowable power flow value is given from the collective monitoring target equipment setting means 9.

When the measured power flow value deviates from the power flow allowable value, the power flow deviation detecting means 3 activates the alarm means 4, and the operator is instructed via the man-machine interface device 10. Alarm is issued.

FIG. 6 shows a setting screen displayed on the display device of the man-machine interface device 10 by the collective monitoring target facility means 9. As shown in FIG. 6, the display device of the man-machine interface device 10 displays the calculation setting pattern, the power flow allowable value, the equipment to be monitored, and the code designation. By setting the equipment to be monitored and the power flow allowable value for the total power flow of those equipments, the power flow deviation detecting means 3 compares the total power flow value and the power flow allowable value to determine the deviation. The code designation portion is for identifying an inflowing tide and an outflowing tide when the power system becomes radial.

According to the fourth embodiment, it becomes possible to monitor the power flow in consideration of the heavy power flow when the loop system operation is changed to the radial operation. That is, the man-machine interface device 10 selects a power facility for collectively monitoring (group monitoring) a plurality of power system facilities (transmission lines, transformers), sets a power flow allowable value for the group, and It is possible to monitor the power flow for the total power flow value of the power system equipment.

[0040]

As described above, according to the present invention,
It is possible to realize the power flow monitoring corresponding to the system operation condition in consideration of the operations of various system stabilizers and relay protection devices set in the power system. In addition, power flow monitoring can be realized for the power system that matches the current system state when the state of the power system changes. Furthermore, it is possible to collectively monitor a plurality of electric power equipment with respect to an arbitrary electric power equipment.

That is, according to the first aspect of the invention, it is possible to monitor the power flow corresponding to various system operating conditions in the power system.

According to the second aspect of the invention, it is possible to select use / non-use by the man-machine interface device for the power flow allowable value corresponding to various system operation conditions.

According to the third aspect of the present invention, a change in the number of lines in the electric power system (a change in the state of the transmission line and the breaker of the transformer) is detected, and the allowable power flow value that matches the system state after the state change is detected. Can be calculated.

According to the fourth aspect of the present invention, the total power flow value can be monitored in order to collectively monitor a plurality of different power system facilities.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a block diagram showing a second embodiment of the present invention.

FIG. 3 is an explanatory diagram of a setting screen of use / non-use of system operation conditions according to the present invention.

FIG. 4 is a block diagram showing a third embodiment of the present invention.

FIG. 5 is a block configuration diagram showing a fourth embodiment of the present invention.

FIG. 6 is an explanatory diagram of a setting screen for collective monitoring target equipment according to the present invention.

FIG. 7 is a block diagram of a conventional example.

[Explanation of symbols]

 1 Remote monitoring and control device 2 Measured value acquisition means 3 Tidal current deviation detection means 4 Alarm output means 5 Tidal current allowable value calculation means 6 Minimum allowable value determination means 7 System operating condition use / non-use setting means 8 Condition change detection means 9 Collective monitoring target Equipment setting means 10 Man-machine interface device 16 Power system power flow monitoring device

Claims (4)

[Claims] 1. A measured value fetching means for fetching a power flow value of a power system via a remote monitoring and control device, a power flow allowance value calculating means for calculating a plurality of power flow allowance values based on a system operating condition, and the power flow allowance. A minimum allowable value determining means for selecting the minimum value of the plurality of allowable power flow values calculated by the value calculating means, and a minimum allowable power flow allowable value selected by the minimum allowable value determining means for the power flow value captured by the measured value importing means. A power system comprising: a power flow deviation detection means for determining whether or not the value exceeds a value; and an alarm output means for generating an alarm when the measured power flow value deviates from the minimum allowable power flow value. Tidal current monitoring device. 2. A system operating condition use / non-use setting unit for setting use / non-use of the minimum power flow allowable value selected by the minimum allowable value determining unit for each system operating condition. The power system power flow monitoring device according to claim 1. 3. A condition change detecting means for detecting a change in the number of lines of the power system is provided, and when the change detecting means detects the change in the number of lines, the allowable power flow value calculating means determines the number of lines. The power system power flow monitoring device according to claim 1, wherein the plurality of allowable power flow values are calculated correspondingly. 4. A measurement value fetching means for fetching a power flow value of a power system via a remote monitoring control device, a power facility to be collectively monitored among a plurality of power facilities constituting the power system, and a power flow allowance thereof. A collective monitoring target equipment setting means for setting a value, and a tidal current deviation detecting means for judging whether or not the tidal current value fetched by the measurement value fetching means exceeds the allowable tidal current value set by the collective monitoring subject equipment setting means. ,
An electric power system power flow monitoring device comprising: an alarm output unit that issues an alarm when the measured power flow value deviates from the minimum allowable power flow value.