JPH04275024A - Power system monitoring system - Google Patents

Abstract

PURPOSE:To facilitate control with a small scale electronic computer even if a number of functional programs are required for the control of the power system. CONSTITUTION:A plurality of independent subsystems are built in one electronic computer and software is provided for each subsystem and, further, change, delete and addition of data are also performed independently.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to power system monitoring systems.

0002

2. Description of the Related Art FIG. 9 is a block diagram showing a conventional power system monitoring system. A conventional power system monitoring system includes slave station devices 1a, 1b, and 1n of the transmission device, a master station device 2 of the transmission device, and a computer 10. Slave station devices 1a, 1b,
1n is placed at various locations in the power system, and momentarily sends information indicating the state of the power system, such as the state of switches, power flow values of power transmission lines, and generator output values, to the master station device 2. 2, such as a generator output increase signal, a decrease signal, a switch opening/closing signal, etc., to control the power system.

The master station device 2 receives information sent from the slave stations 1a, 1b, 1n and passes it to the computer 10, and also receives the control signal calculated by the computer 10 and transmits the information sent from the slave stations 1a, 1b, 1n. Send to 1b, 1n. The computer 10 has a function of monitoring the power system based on information received from the master station device 2, and also calculates a necessary control amount and passes it to the master station device 2 as a control signal.

[0004] The electronic computer 10 includes functional program sections 3a, 3b, and 3m, a data section 4, and a management section 5. The information that the computer 10 receives from the master station device 2 is actually used by the functional program units 3a, 3b, and 3m. In other words, the function program sections 3a, 3b, 3m are the master station device 2.
Using the information received from and the information in the data section 4, the power system is monitored and the control amount is calculated according to each of the functional program sections 3a, 3b, and 3m. The control amounts calculated by the programs in the function program units 3a, 3b, and 3m eventually become control signals passed from the computer 10 to the master station device 2. Here, the data section 4 includes power system data required by the programs in all the functional program sections 3a, 3b, and 3m. This data includes, for example, the upper limit value, lower limit value, and rate of change in output for each generator.
These include fuel cost characteristics and power flow upper limit values for power transmission lines.

[0005] Furthermore, the management section 5 maintains and manages the data in the data section 4, receives requests for changing, deleting, and adding data, and changes, deletes, or adds data in accordance with those requests. For example, based on a request to change the upper limit value of a specific generator, the content of the data can be changed, or based on a request to add a new generator, the upper limit value, lower limit value, output change rate, fuel, etc. of the added generator can be changed. Add expense characteristics. Furthermore, based on a request to delete an old generator, the upper limit value, lower limit value, output change rate, fuel cost characteristics, etc. of the generator to be deleted are deleted.

[0006]

[Problems to be Solved by the Invention] The conventional power system monitoring system described above has the following drawbacks. That is, the data in the data 4 needs to be designed to include just the right amount of information necessary for all functional programs. This means that when the number of functional programs exceeds several hundred, it becomes extremely difficult to design, and the data cannot be designed unless all functional programs are designed, and the functional programs cannot be tested until the data is completed. This was a strong constraint when manufacturing the entire system.

[0007] Also, since there are many programs, data 4
As the data in the computer becomes larger, a larger computer 10 is required to incorporate the data, and as a result, large-scale software must be constructed using the larger computer 10. In such cases, the cost of software production required increases exponentially rather than proportionally as the amount of software increases, and large-scale software production requires more sophisticated software production than small-scale software production. This has been a major drawback of conventional power system monitoring systems, such as the need for advanced technology. The present invention was made to solve the above problems, and is easy to manufacture.
Another object of the present invention is to provide a power system monitoring system in which manufacturing costs do not increase exponentially as the amount of software increases.

[0008]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a functional program unit for realizing a power system monitoring function and a data unit referenced by the functional program unit, as shown in FIG. In a power system monitoring system that has a transmission device that transmits information indicating the state of the power system and the state of the power system to a computer, the management units of two or more subsystems built into the computer change data and
A reception means for accepting deletion/addition requests, a data maintenance means for modifying, deleting, or adding to the data of the own subsystem based on the request, and a data maintenance means for changing, deleting, or adding data to the data of the own subsystem based on the request; It consists of communication means for communicating requests to subsystems.

[0009]

[Operation] Each functional program section monitors the power system using information indicating the state of the power system transmitted via the slave station device and master station device of the transmission device, and each data. A control amount is calculated, and the control amount is sent as a control signal to the power grid via the master station device and the slave station device to perform control. On the other hand, when it becomes necessary to change data due to equipment expansion or changes in the power system, a change request is input from the management department. The change request here refers to either a change, deletion, or addition of contents. The change request is accepted by the request receiving means in the management section, and then the data is changed, deleted, or added based on the request by the maintenance means. Here, the request may include things unrelated to the data, but the maintenance means changes, deletes, and adds data based only on things related to the data. Furthermore, requests from the communication means are communicated to other system management units.

[0010] The request receiving means of the other management section 5b receives the request, and the data 4 is processed by the maintenance means similarly to the management section 5a.
b is changed, deleted, or added, and the request is communicated to the management section 5m of the subsystem 11m by the communication means. Management department 5
In m, the request receiving means accepts this request, and the maintenance means changes, deletes, and adds data 4m. Management department 5m here
The contact means does not contact any other subsystems because there are no other subsystems that are not accepting requests.

[0011] The communication method between the management units 5a, 5b, and 5m is as follows:
As explained above, from the management section 5a to 5b, from 5b to 5
Various methods can be considered, such as a method of sequentially contacting the management section 5a such as "m", or a method of simultaneously contacting the management sections 5b and 5m from the management section 5a, but the point is that any method can be used within the scope of sending the request to the management section of another subsystem. Any method is fine. Also, it is possible to contact the management department 5a to 5b, 5b to 5m, and 5m to 5a to confirm that all subsystems have been contacted, but any method may be used. Needless to say.

In the explanation of FIG. 1, the subsystems 11a, 1
1b is incorporated into the computer 10a, and subsystem 1
1m is incorporated into another computer 10k, but when all subsystems are incorporated into one computer, or when one subsystem is incorporated into one computer and consists of multiple computers. However, any configuration may be used within the scope of the idea that two or more subsystems are incorporated in one or more computers.

[0013]

[Embodiment] An embodiment will be described below with reference to the drawings. FIG. 2 is a block diagram of an embodiment of a power system monitoring system according to the present invention. Figure 2 shows the automatic frequency control function (AF
This example shows an example having two functions: an economic load distribution function (hereinafter referred to as ELD) and an economic load distribution function (hereinafter referred to as ELD). The slave station devices 1a, 1b, 1n of the transmission device are connected to the system frequency F and the generator output Pi (
i = 1 to the number of generators) and the interconnection line power flow Ptie are transmitted to the master station device 2, and the reference output Ps of the generator is transmitted from the master station device
i and the generator raising/lowering signal ΔPi. The master station device 2 sends F, Ptie, and Pi to the computer 10a, and receives Psi and ΔPi from the computer 10a.

The computer 10a has an AFC subsystem 11a and an ELD subsystem 11b built in, and the AFC subsystem 11a consists of an AFC program section 3a, a data section 4a, and a management section 5a.
The subsystem 11b consists of an ELD program section 3b, a data section 4b, and a management section 5b. The data section 4a consists of the generator output upper and lower limits and the generator output change rate, and the data section 4b consists of the generator output upper and lower limits and fuel cost characteristics.

The management unit 5a also includes a request receiving means 6a that receives requests for changing, deleting, and adding the data portion 4a and/or the data portion 4b; - It has a maintenance means 7a for adding, and a communication means 8a for communicating this request to the management section 5b after receiving a request for change, deletion, or addition.

The management section 5b has a request receiving means 6b similar to the management section 5a, a maintenance means 7b, and a communication means 8b for communicating the request to the management section 5a after receiving a request for change, deletion, or addition.

Next, the operation will be explained. System frequency F
, the generator output Pi, and the interconnection line power flow Ptie are delivered to the computer 10a via the slave station devices 1a, 1b, 1n and the master station device 2 of the transmission device. The AFC program section 3a in the AFC subsystem 11a receives the grid frequency F (Hz) from the master station device 2 and the generator output Pi (MW).
and receives the interconnection line power flow Ptie (MW), and also receives the generator output change rate PMW (MW/min) from the data section 4a.
and the upper and lower limit values PUP (MW) and PLM (MW), and from these the generator up signal or down signal ΔPi
is calculated and passed to the master station device 2.

For example, the AFC program section 3a has AR=k.
The regional request amount AR is calculated by ×(F-F0)+Ptie. Next, ΔPi = PMWi × PMWi /Σ
A generator raising/lowering signal ΔPi is calculated using PMWi. At this time, ΔPi of the generator whose output value has reached the upper limit or lower limit is set to 0. Here, k is a constant, F0 is a reference frequency, and i is a suffix indicating a generator.

The ELD program section 3b receives the output Pi of each generator from the master station device 2, reads the upper and lower limits and fuel cost characteristics PA, PB, PC from the data section 4b,
The reference output Psi of each generator is calculated and determined according to the law of equal incremental fuel cost, that is, as follows, and the Psi is transferred to the master station device 2. Note that Psi is set to a value between the upper limit value and the lower limit value. Here, λ is the incremental fuel cost, F is the fuel cost, and F=P
A×P2 +PB×P+Pc, PL is transmission loss, Σ
Ps = ΣP.

In this way, the ELD program section 3b calculates the standard output value Psi of each generator every 5 minutes, and the AFC program section 3a calculates the generator output increase/decrease signal ΔPi every 2 seconds. The values calculated by both programs are sent to the generator via the master station device 2 and slave station devices 1a, 1b, 1n, and the frequency of the power system is kept constant.
In addition, the generator is operated so that the output of the generator becomes economical.

[0021] If the upper and lower limits of the generator, the output change rate,
When it becomes necessary to change, delete, or add fuel cost characteristics, and the generator name and the details of the changes, deletions, and additions are input to the management section 5a, the request receiving means 6a of the management section 5a accepts this, and the maintenance means 7a changes the corresponding part of the data part 4a. FIG. 3 shows the contents of the data section 4a in detail. For example, if the requested content is to change the upper limit value of the generator 3G, the content of PUP(3) in FIG. 3 will be changed by the maintenance means 7a.

Further, for example, if the content of the change is a change in the fuel cost characteristics of the generator 3G, the maintenance means 7a does not change the data 4a because it is not related to the data section 4a. For example, if the change is to add a new generator, the maintenance method is to newly set the spare 1 (or spare 2) to 7G and PUP (
7), PLW (7), and PMW (7) are added. The result is as shown in FIG.

[0023] Also, for example, if the request is to delete generator 3G, 3G is reserved and PUP (3), PLW (3),
Delete PMW (3). The result is shown in FIG. As described above, when the request is for change, addition, or deletion, maintenance method 7
Although it has been explained that "a" changes, adds, and deletes the data section 4a, separately from this, the communication means 8a of FIG. 2 communicates a request to the management section 5b of the ELD subsystem 11b. In the management section 5b, the request receiving means 6b receives this. Subsequently, the maintenance means 7b of the management section 5b changes the data in the data section 4b. For example, if the request is to change the upper limit value of the generator 3G, the maintenance means 7b changes PUP(3) in FIG. Also, for example, if the request is the fuel cost characteristic PA of the generator 3G,
In the case of changing PB or PC, the maintenance method is PA (3) in Figure 7.
), PB(3), and PC(3).

For example, if the request is for the addition of a new generator, the maintenance means 7b updates the spare 1 (or spare 2) to 7G, and updates the PUP (7) and PLW (7) in FIG.
, PA(7), PB(7), PB(7), and PC(7) are added. As a result, FIG. 6 is changed as shown in FIG. 7. For example, if the request is to delete the generator 3G, the maintenance means 7b uses 3G in FIG.
(3), PLW (3), PA (3), PB (3), PC
Delete (3). As a result, FIG. 6 is changed as shown in FIG. 8. In this way, the maintenance means of the management section 5b in FIG. 2 changes the data 4b based on the request, but on the other hand,
Since there is no subsystem that has not already received a request, the communication means 7b does not communicate the request to other subsystems.

As explained above, according to the above embodiment, the AFC subsystem and the ELD subsystem are independent of each other, and in particular, the data section 4a and the data section 4b have the advantage that they can be designed completely separately. . That is, since only information used only by the AFC program section 3a needs to be included in the data section 4a, the AFC subsystem 11a can be used without considering the ELD subsystem 11b.
can be designed. This means that the ELD subsystem 11b
This feature also applies when designing. As a result, there are fewer restrictions when manufacturing the system, and cost increases due to the volume of software can be prevented. Furthermore, when changing or deleting the data section 4a or 4b,
If either the management section 5a or 5b accepts the request, all the subsystem data, that is, the data section 4
Each data in a and 4b is changed based on a request, which is extremely advantageous in the case of a system that monitors something that is frequently expanded, such as an electric power system.

According to the above embodiment, two subsystems were incorporated into one computer. However, the effect of the present invention increases significantly as the number of subsystems increases. It goes without saying that it is also possible to construct a system in which several subsystems are incorporated into a plurality of computers. In either case, the feature is that software can be manufactured independently for each small, independent subsystem, and that data can be changed, deleted, and added to each subsystem in a systematic manner.

In the above embodiment, control signals are transmitted from the electronic computer 10a to the master station device 2, slave station devices 1a, 1b,
1n, the control signal is not sent to the power system, and the slave station devices 1a, 1b, 1
This also applies to a power system monitoring system in which each subsystem built into the computer only performs monitoring based on information indicating the state of the power system passed to the computer 10a via the master station device 2. It is clear that the invention is applicable.

[0028]

[Effects of the Invention] As explained above, according to the present invention,
Since a power system monitoring system can be realized by a small-scale collection of software, it is much easier to create than conventional systems. That is, the manufacturing cost does not increase exponentially as the amount of software increases, and it can be manufactured using a technology that is easier than large-scale software manufacturing technology. In addition, the manufacturing constraints of conventional power system monitoring systems, such as completing all program design as a constraint for data design or completing all data as a condition for testing functional programs, have been removed. The power system monitoring system according to the present invention is also extremely advantageous in this respect. Furthermore, when the system is divided into many subsystems, maintenance such as changing, deleting, and adding data is likely to become a problem, especially when monitoring targets that are constantly being changed, deleted, and added as the economy of the electric power system develops. Data maintenance can be a fatal problem for power system monitoring systems. Also from this point of view, the power system monitoring system according to the present invention is easy to maintain and is extremely excellent.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a power system monitoring system of the present invention.

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

[Figure 3],

[Figure 4],

FIG. 5 is a diagram showing the contents of data of AF and subsystems.

[Figure 6],

[Figure 7],

FIG. 8 is a diagram showing the contents of data of the ELD subsystem.

FIG. 9 is a block diagram of a conventional power system monitoring system.

[Explanation of symbols]

1a, 1b~1n Slave station device 2 Master station device 3a, 3b to 3n Function program section 4 Data section 5 Management Department 10 Electronic computer

Claims (1)

[Claims] [Claim 1] A subsystem incorporating two or more subsystems consisting of a functional program for realizing a power system monitoring function, a data section referenced by the functional program, and a management section that monitors the contents of the data section. In a power system monitoring system that includes a computer and a transmission device that transmits information indicating the status of the power system and passes it to the computer, the management units of two or more subsystems built into the computer change data.・A reception means that accepts deletion/addition requests, a data maintenance means that changes, deletes, or adds to the data of its own subsystem based on the request, and a data maintenance means that accepts the data request but does not accept the request. A power system monitoring system characterized by having a communication means for communicating requests to other subsystems.