JPS61247244A - Monitor controller for power system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention generally relates to a power system monitoring and control device, and
More specifically, the present invention relates to a power system monitoring and control device that extracts and displays data indicating an abnormality in the power system that is outside a preset allowable range.

[Conventional technology]

As a conventional power system monitoring and control device of this kind, there is one disclosed in, for example, Japanese Patent Laid-Open No. 57-91618. The device provides preset data even for system statuses that are not collected from the system status detection unit.
The system state detection data is provided with redundancy, and the system state detection data and the setting data are compared and calculated to detect abnormal data exceeding the allowable range and display the data.

FIG. 4 is a diagram showing the configuration of the power system monitoring and control device described above. In FIG. 4, the supervisory control unit 10 is composed of an arithmetic circuit 11, and a control circuit 12 and a memory circuit 13, which are connected to the arithmetic circuit 11, respectively. A system state detection unit 20&i, for example, a group of measuring instruments 21 provided on power transmission lines 41, 42, 43, 44 as shown in FIG.

and a transmission circuit group 22 that transmits data detected by the measuring device group 21 to the arithmetic circuit 11. The detected data monitoring unit 30 includes a monitoring circuit 31 and an input circuit 32 connected to the arithmetic circuit 11, and the monitoring circuit 3.
1 and a display circuit 33 connected to the display circuit 1.

Next, the operation of the power system monitoring and control device configured as described above will be explained. Power transmission line 41.42-.

43. Current flowing through 44 P 1 g P 2 * P
5 + P 4 is measured by a measuring device group 21 provided for each line, and transmitted to the arithmetic circuit 11 via a transmission circuit group 22. From the input circuit 32, the arithmetic circuit 1
1 is the setting data regarding the power system that has not yet been collected from the system state detection unit 20 (in FIG. 2, power flow P,
That is, the sum of P2 and P) is provided to the arithmetic circuit 11. The setting data is output from the arithmetic circuit 11 to the memory circuit 13 and stored in the memory circuit 13. The data stored in the memory circuit 13 is converted to P,=P2+ by the arithmetic circuit 11 according to the arithmetic command output from the control circuit 12.
P is calculated. From the input circuit 32.

Although not shown in FIG. 2, the tidal flow p1. p2゜p,
, p4. Setting data for monitoring p, is also input,
The data is stored in the memory circuit 13 via the arithmetic circuit 11. The arithmetic circuit 11 receives the data P□.

P2. A comparison operation is performed between P, , p, , p and the respective monitoring setting data, and the result of this operation is sent to the monitoring circuit 31.
Output to. Based on the comparison result, the monitoring circuit 31 detects abnormal data exceeding a preset tolerance range and outputs the detected abnormal data to the 1 display circuit 33.

[Problem that the invention seeks to solve]

The configuration is similar to that of the conventional electric power system monitoring and control device FIA, and redundancy is provided to the detection data output from the measuring device group 21, so that it is possible to prevent problems from occurring in, for example, the transmission circuit group 22, etc. If not, it is possible to accurately detect an abnormal state occurring in the power system based on the data. However, if there is an abnormality such as a bit shift in the data measured by the measuring device 2-1 group due to a malfunction occurring in the transmission circuit 22 group or a code bit error in the detected data, the supervisory control unit 1 However, there is a problem in that it is not possible to determine from the data whether or not an abnormality has occurred in the power system, making it impossible to accurately detect the abnormality.

This invention was made to solve the above-mentioned problems, and even if an abnormality occurs in the data regarding the system status of the power system, the abnormality in the detected data is corrected and then the abnormality occurs in the power system. It is an object of the present invention to provide a power system monitoring and control device that can continuously monitor the system status by determining whether or not the system status has been exceeded.

[Means for solving problems]

In the power system monitoring and control device according to the present invention, the data input to the supervisory control unit is actually detected by the system state detection means based on the normal data of the power system set in advance and the line constants in the power system. A determination means is provided for determining whether or not the detected value data matches the detected data, and when the determination means determines that the data does not match, the input detection value data is corrected to the actually detected data and the power system is adjusted. It is designed to perform monitoring.

[Effect]

The power system monitoring and control device according to the present invention provides data on power system status during normal operation (for example, active power).

The abnormal state of the data input to the monitoring control unit is corrected by simple arithmetic processing using reactive power, voltage) and known line constants of the power system, and the power system continues to be monitored.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a circuit configuration diagram of a power system monitoring and control device according to an embodiment of the present invention.

In FIG. 1, the monitoring control unit 10 is composed of an arithmetic circuit 11, a control circuit 12, a memory circuit 13, and a determining means, ie, a correction circuit 14, which are connected to the arithmetic circuit 11, respectively. For example, the system state detection unit 20 uses a group of measuring instruments 21 installed on the power transmission lines 41, 42, 43, and 44 as shown in FIG. and a group of transmission circuits 22 that transmit data to the arithmetic circuit 11 via a correction circuit 14. The detected data monitoring unit 30 includes a monitoring circuit 31 and an input circuit 32 connected to the arithmetic circuit 11, and a display circuit 33 connected to the monitoring circuit 31.

Next, the operation of the power system monitoring and control device having the above-mentioned configuration will be described below, mainly with reference to the equivalent circuit diagrams of the power system shown in FIGS. 2 and 3.

Tidal current P1 flowing through power transmission lines 41, 42, 43, 44
, P 2 t P 5 t P @ and mother 1145o
Voltage V.

is measured by a group of measuring instruments 21, and the measurement results are transmitted as data to a correction circuit 14 via a group of transmission circuits 22.

The correction circuit 14 determines whether or not the tidal flow data itself has been transmitted normally using a known and appropriate method as will be described later. If it is determined that there is, the data is corrected to the data that would be output from the measuring instruments 21 group when the transmission circuits 22 group etc. are normal, and then outputted to the arithmetic circuit 11. On the other hand, when the correction circuit 14 determines that there is no abnormality in the data itself, the data is output to the arithmetic circuit 11 without being corrected. Input circuit 3
Setting data for monitoring the tidal currents P, P2p, , p, , p are input from 2 and stored in the storage circuit 13 via the arithmetic circuit 11 . The arithmetic circuit 11 is a correction circuit 1
4 and monitoring setting data provided via the input circuit 32 are compared and calculated in accordance with the calculation command output from the control circuit 12, and the calculation result is output to the monitoring circuit 31. Then, the monitoring circuit 31 detects abnormal data exceeding a preset allowable width from the comparison calculation result and outputs the detected data to the 1 display circuit 33 for display.

Next, a specific correction method in the above-mentioned power flow data correction circuit 14 will be explained. The power system shown in FIG. 3 connects bus bars T and T2 and has an impedance of R+ j x. Further, it is assumed that the voltage applied to the bus T is V□, the voltage applied to the bus T2 is v2, and that the current is flowing from the bus T1 to the bus T2 via the power system. If the active power flowing into the power system from the bus T is Po, the reactive power is Q, the active power flowing from the power system to the bus T2 is P2, and the reactive power is Q2, then these %P.

Q 1 s V 1 s P 21 Q 2 r v2
is measured by a group of measuring instruments 21 and transmitted to a correction circuit 14 via a group of transmission circuits 22. When the data input to the correction circuit 14 via the transmission circuit group 22 is determined to have an abnormality based on a known method such as bit verification, the data abnormality is corrected by the process described below. Let's do it. Now, the active power P2 on the bus T2 side. It is assumed that there is an abnormality in the data regarding reactive power Q2 and voltage v2.g Active power P2 and reactive power Q2 are normal active power P1,
It is obtained from the reactive power Q□ as follows.

p2=px-pbos day Q2''Ql-QLOEI day PLOEIEI j QLO8 in the above two formulas
Ei Fi.

This is the loss of active power and reactive power generated in the power system, and each is expressed as follows.

PLoss -R-I" QLoss =
It has the following relationship with the voltage V on the T1 side, active power P1, and reactive power Q□.

If we square both sides of the above equation.

becomes. From now on, Pboss t QIJossti
It will look like this:

Then, if P2*Q2 is expressed using the above two equations, %P21Q2 becomes a modulus.

Based on the above two equations, data abnormalities in the data related to P2tQ2 are corrected among the detection data input to the correction circuit 14 via the transmission circuit group 22. Also, PLOBBsQ:bos day calculated from the bus line T□ side and PI, osd and QT, , 0813' calculated from the bus line T2 side are equal, therefore, PX, 0F3B = PLOBB
Because 'tQLoss = Qboss' or.

The following relational expressions are established.

When v2 is determined from the above equation, any data abnormalities in the data related to v2 among the detected data are corrected using the above equation.

By doing the above, abnormalities in the data itself can be corrected based on normal data.

〔Effect of the invention〕

As described above, according to the present invention, an abnormal state of data input to the supervisory control unit can be corrected by simple arithmetic processing using data on the power system state during normal operation and known line constants of the power system. Therefore, it is possible to obtain an electric power system monitoring and control device that can continuously monitor the system status.

[Brief explanation of drawings]

FIG. 1 is a circuit configuration diagram of a power system monitoring and control device according to an embodiment of the present invention, FIG. 2 is a power system diagram in which the device shown in FIG. 1 is used, and FIG. 3 is a power system diagram FIG. 4 is a circuit configuration diagram of a conventional power system monitoring and control device. In the figure, 10 is a monitoring control unit, 11. #"j calculation circuit, 12 #i control circuit, 13 storage circuit, 14t! correction circuit, 20 system status detection section, 21 measurement instrument group, 22 transmission circuit group, 30Fi detection data monitoring section, 31 32 is a monitoring circuit, 32 is an input circuit, and 33Fi display circuit. Note that the same reference numerals in each figure indicate the same or equivalent parts. Patent applicant Mitsubishi Electric Corporation (2 others)' ・ Procedural amendment (voluntary) ) July 26, 1985

Claims (1)

[Claims] It has a system state detection means for detecting the system state of the power system, and a monitoring control section that compares and calculates the detection value data output from the system state detection means and preset normal data of the power system. and in a power system monitoring and control device that extracts and displays data indicating an abnormality in the power system outside a preset tolerance range from the detected value data,
The detection value data input to the supervisory control unit based on the normal data set in advance and the line constant in the power system is actually detected by the system state detection means. A determining means is provided for determining whether or not the input detection value data matches the actually detected data. A power system monitoring and control device, characterized in that the detected value data is corrected to the actually detected data.