JPS6268144A - Demand surveillance controller for substation for railroad - Google Patents

Abstract

PURPOSE:To prevent the electric power excess without generating the trouble in the fed to a train by judging te system constitution optimum for loading the load of a substation in which the generation of overoad state is forecasted to the contiguous substation and generating a control instruction. CONSTITUTION:The captioned demand surveillance controller processes 32 a set velue sent from a control station and memorizes the value into a memory means 34. When the demand start is set, the electric power input treatment 36 is executed, and the estimated electric power Qp is calculated from the electric power Pt at present after the lapse of Tmin from the demand start and the rest time by a calculation means 42, and the estimated excessive electric power Qd is calculated from the estimation electric power Qp and the aimed electric power Qo by a calculating means 44. When Qd exceeds a limit value, a control construction is generated by judging the system constitution optimum for the transmission of the estimated used electric power Qu obtained from Qd and Pt to a contiguous substation and for loading the load of the substation where the overload state is forecasted to the contiguous substation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a demand monitoring υj control device for electric railway substations.

[Technical background of the invention and its problems]

Demand monitoring and control devices have conventionally existed that monitor and predict the power consumption for a certain period of time and issue an alarm or load cutoff when it is predicted that the power consumption will exceed a predetermined amount. However, in the case of electric railway substations, there is a restriction that load shedding cannot be performed due to the public nature of the load being that of electric railways, so the demand monitoring and control device that performs load shedding as described above could not be applied.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a demand monitoring and control device that can continue the operation of an electric railway substation without cutting off the load when the load on the electric railway substation is predicted to become excessive.

(Summary of the Invention) The demand monitoring and control device of the present invention was developed in view of the above points, and is capable of providing predicted power usage information, etc. to substations for electric railways, to which conventional demand monitoring and control devices could not be applied.
By transmitting and receiving between adjacent substations, we determine the optimal system configuration to share the load of substations that are predicted to be overloaded, and control them including adjacent substations, Ki1 division stations, etc. This is to prevent excess power.

In general, the principle of a demand monitoring control device is to predict the power consumption Q within a certain period of time using the following formula (1), and calculate the predicted excess power Qd, which is the difference from the predetermined target power, using formula (2). Accordingly, a predetermined alarm or i-control command is selected and executed based on the relationship with the remaining time.

Q-P, + (ΔP/Δt)XST (1) However, Q,: Predicted power h1 P,: Current power from demand start to T minutes, ΔP: T
Average power Δ before minutes, ST: remaining time.

Q, -Ql) -Q.・・・・・・・・・・・・
...(2) However, Q: Exceeded predictions.

Qo = target power.

Also, the predicted power usage Q is as follows: Qu=Q, -Pt ・・・・・・・・・・・・・・・
(3) The demand monitoring and control device of the present invention has the following functions in addition to the conventional functions described above in an electric railway substation. The predicted power usage Q of the substation that issued the overload alarm, determined above, is transmitted to each adjacent substation, and the substation that receives it determines the stage at which additional burden can be applied based on the situation of the predicted excess power Qd of one location. demand. The method for finding it is as follows.

In general, assuming that the load is relatively averaged over the sections, and if the total length of one section is the length of the overloaded substation, then the adjacent substation to be relieved will be able to switch on and off the feeding division equipment. The total distance for one section where relief power can be supplied is determined by gl in descending order.

1...ρ (jl-0, j1=L). 2m and D・-(1・/L)×Q, (i=1~m)...
・・・・・・・・・(4) is the stage at which the relief substation can bear the burden due to the opening and closing of the feeding division equipment, D, and the predicted power consumption Qd of the relief substation are compared with the following ((4). The largest corner that satisfies 5) shall be the maximum chargeable power.

D, +Qd<δ ・・・・・・・・・・・・・
...(5) (δ: Constant for margin δ≦O) This maximum borne power is returned to the overloaded substation, and the overloaded substation that receives it calculates the D of each adjacent substation. Total, Q
, when D is smaller than D for each adjacent substation.
Of these, the total exceeds Q, and it is possible to construct a feeding system for all sections to be covered.

By selecting a combination of
fi is stopped to prevent excess power.

[Embodiments of the invention]

As an example of this device, an example suitable for an AC railway substation is shown below.

An example of the configuration of this book is shown in Figure 1.

This device includes an arithmetic processing section 10, a storage section 12, an operation/display section 14, an operation/display input/output section 16, an electric power section 18, a transmission device input/output section 20, and a control device input/output section 22.

The arithmetic processing unit 10 calculates 31! Power calculation, excess power calculation,
Performs various processing such as high-load processing, display processing, and control command processing.

The storage unit 12 stores data such as power values such as current power and predicted power, time, and alarm setting values.

The operation display unit 14 displays the target power Q. Settings and reservations such as
11 Power Q9, predicted excess power Qd1 remaining time ST, current power P0, time, alarm, etc. are displayed, and demand start designation is performed.

The operation display input/output section 16 is an interface section of the operation display section 14.

The power input unit 18 inputs the pulse input amount from the power amount calculation, multiplies it by n, and stores the current power P. The transmission device input/output section 20 is an interface section of a transmission device, etc.
Transmission of data and alarms, etc. to the control center via transmission equipment, reception of operation and setting commands, and predicted power usage Q between other substations, etc. and the controlled station.

It sends and receives messages, replies, and control commands.

It is preferable that the transmission device has a communication function between the controlled stations, but if it does not have this function, it is necessary to transmit the predicted power consumption Qu etc. via the control station.

Control S! The large input/output unit 2 is an interface unit that outputs a switch-off command to a switching control device such as a switchboard at one location, and inputs a response result.

An example of the functional configuration of the above device is shown in FIG. The processing up to the calculation of excess power π1 is similar to that of conventional devices, and the operation display unit memorizes the set value (32) given from the control center (34).
, performs power input processing by setting the demand start (3
6>, predicted power Q, prediction a1 by equations (1) and (2)
1I Excess power Q is calculated (40, 42>, and displayed/stored (44, 46>).

If it is necessary to cut power to one location, such as when the calculated excess power value of the zero location becomes positive at a predetermined time, the zero location high load processing (48) is performed, for example, as shown in FIG. 3. That is, when Q exceeds the limit value (102), the predicted power consumption Q. is transmitted to all adjacent substations via transmission equipment (5
0) L, seeking relief (10/I). In this embodiment, the number of adjacent substations is two, but the process is similar for three or more substations.

The same device at the adjacent substation that has received the predicted power usage performs the high load elsewhere process (52) in FIG. 4 to determine whether or not the overloaded substation can be rescued.

That is, first, each substation receives Q from other locations (
202>, compare with Qd of one place204), If Q, 10Qd<Q, reply (206) that Qu can be paid to the other place208), Q +Qd≧O, and Q, /2+Qd If <0 (210), reply that QU/2 can be paid to the other place (212), and if Q/2+Q, ≧O, reply that it cannot be paid to the other place (214).

In this example, there is a link between substations as shown in Figure 5.
This assumes that one sorting station is established, and for operational reasons, during normal times, ki 1
Assuming that the substation that supplies power to the division station supplies power to the overloaded substation for both the -L and downstream lines, or to one division station beyond that, m in equation (4) is 3. , and assuming that the distances between the overload substation and the neighboring Ki1 division stations are approximately equal, j/L=O, J12/L=1/2, LJ3
Since /L=1, it is difficult to compare Q, Q11/2 and Qd. In this example, δ in equation (5) is O.

The maximum loadable power determined in this process is returned to the overloaded substation.

The overloaded substation that receives replies from the substations on both sides continues the process shown in FIG. 3. That is, the following processing is performed depending on the maximum burdenable power level returned from each city center. First, if both bosses 1 on both sides can bear the burden of Q, /2 or more (108), output a command to power out the 0 location to the control Ut+ panel 54), and send an extension command to the posts on both sides (110). When one post is able to bear the burden of Q (112), output a command to control 15J to cut power to one location and take an extended configuration (54), and send an extension command to the one post (114). When one post can bear Q,/2 (116), output a command to the control panel to cut off the line on the one post side (54), and send an extension command to the one post (54). 118). If none of the above applies, a load sharing impossible alarm is output (120).

As mentioned above, depending on the maximum burdenable power returned from the substations on both sides:
A control command is issued by selecting a command to the main room (main room division), a line change command for 0 locations, etc., and the substations on both sides supply power within a range that does not exceed the maximum burdenable power of the adjacent substation, and the power is cut off in the blackout area. Either change the system to ensure that there is no electricity, and eliminate the section where electricity is supplied to one place, resulting in a power outage, or if that is not possible, pressurize only the minimum designated section.

Demand control is now complete, and depending on the time, commands, etc.
There is a restoration process (56, 122) to return to the original state.

Figure 5 shows the operation sequence in an AC electric railway system. During normal operation, the A substation (abbreviated as A3) is up to the B superimposed substation (abbreviated as B), and the C substation Css is the B superimposed substation P. BD and superposition branch office D, E'g!L power station Ess is s
Suppose that p' spD is superimposed and the current is applied to D. When it is determined that the Css demand monitoring control device is at its limit due to overload, A.
SE is predicted power usage Q.

Transmit ss ss. 8 received [Then, the first reservation is
ss Compared with measured overpower Qd, in this case △8. replies that Q can be borne and [5, cannot be borne. Received reply ()
The demand monitoring and control device of the Css, as shown in FIG. 13(b), controls the source circuit breaker 81 "off" and the disconnector 82 "person" and confirms the response at step 135. Noshiyada 483.
84 "enter" command (extension command) is issued. In other words, the system configuration is changed to one in which power is cut off at C, and power is generated at Δ, S and S, to prevent power from exceeding Css.

As described above, according to the present embodiment described in L, demand monitoring control is now possible even for electric railway substations, which could not be applied in the past.

The above embodiment is an example of an AC substation, but a DC substation can be implemented in the same way, although the control of the classification equipment is simplified.

In addition, in Koku's embodiment, the demand monitoring and control device of the adjacent substation receives the predicted power usage Q of the overloaded substation, calculates the maximum burdenable power, and sends it back. It is assumed that the adjacent substation transmits the predicted excess power Q, either constantly or at scheduled times, to the substation where overload is predicted, and the process for determining the maximum borne power shown in Figure 4 is concentrated at the overloaded substation. It is also possible to do so.

〔Effect of the invention〕

With this device, demand control is also possible for the ff1U substation, and by automatically adjusting the system configuration to appropriate load distribution at the railway substation, it is possible to prevent excess power usage.

[Brief explanation of drawings]

FIG. 1 is a block diagram that does not show an example of the configuration of the demand monitoring and control device of the present invention. FIG. 2 is a block diagram showing an example of the functional configuration of the device shown in FIG. 1. FIG. 3 shows a flowchart 11-1 showing an example of the source debt processing.
1~. FIG. 4 is a flowchart showing an example of high load processing elsewhere. Figures 5 (a) and (b) show that in an AC electric railway system,
It is a figure showing an example of operation of system composition. 1... Demand monitoring control device, 32... Operation/setting processing, 34... Setting value storage, 36... "Power input processing, 3B... Time management, 40... Current power storage, 4
0...Current power memory, 42...Predicted power instruction g'j,
471...Excess power calculation/memory/judgment, 46...Display processing, 48...Source high/negative? JI processing, 50... Communication processing with another location, 52... Other location high angle i', ? i processing,
54... Ruri Goban input/output, 56... Return processing, 60
...Transmission device, 70...Switchboard. ~; 1st Doctor, Figure 3, Funeral Diagram

Claims (1)

[Claims] At a railway substation, if we predict the power usage over a certain period of time and determine that it will exceed a set limit, we can predict overload by exchanging information such as predicted power usage with neighboring substations. A demand monitoring and control device for electric railway substations that determines the optimal system configuration for distributing the load of a substation to neighboring substations, issues control commands, and prevents excess power without disrupting the supply to trains.