Power distribution automation system

Abstract

To provide a power distribution automation system that can prevent an apparatus from being damaged by opening or closing of an opening-closing device.SOLUTION: A power distribution automation system 1 includes: a system state storage device 21 for storing the state of a power distribution system including the state of automatic voltage adjusting devices 51 and 52; and a monitor control desk 4 for controlling an apparatus in the power distribution system. When an opening or closing operation of an opening-closing device is input from the monitor control desk, it is determined on the basis of the state of the power distribution system whether the operation is to be prohibited since the operation will damage the automatic voltage adjusting devices or a peripheral device thereof. If the operation is determined to be prohibited, an alert is issued.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a power distribution automation system that monitors and controls a power distribution system including an automatic voltage regulator. [Background technology]

[0002] Conventionally, distribution automation systems have been installed and operated to monitor distribution systems and control switches, identify power outage areas on the distribution system when a power outage occurs, and generate power outage information such as the occurrence of a power outage and the restoration of power supply based on the results of monitoring and control. In addition, as automatic voltage adjustment devices for maintaining the voltage of a distribution line at an appropriate level, for example, a static voltage regulator (SVR) on-load tap changing transformer device is installed midway along the distribution line, and a step switched reactor (SSR) is installed at the terminal side of the distribution line (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-41405 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, when switching between systems, it is necessary to take into consideration and pay attention (protection) to the state of the distribution system, etc., so that equipment such as automatic voltage regulators is not damaged and this does not lead to a distribution line accident. For example, it is necessary to check whether opening and closing a switch will damage the SVR or the switch before operating the switch, but such checks have traditionally been done by personnel / operators. For this reason, there is a risk that the personnel may make an incorrect check or judgment due to lack of experience or carelessness, which may result in damage to the equipment and lead to a distribution line accident.

[0005] SUMMARY OF THE PRESENT EMBODIMENTS Accordingly, an object of the present invention is to provide a power distribution automation system capable of preventing damage to equipment caused by opening and closing switches. [Means for solving the problem]

[0007] In order to solve the above problems, the invention of claim 1 comprises a system status storage device that stores the state of a power distribution system including the state of an automatic voltage regulator, and a monitoring and control device that can control equipment in the power distribution system, and when an opening and closing operation of a switch is input from the monitoring and control device, the device judges whether or not the automatic voltage regulator or its peripheral equipment is to be inoperable based on the state of the power distribution system when the operation would damage the automatic voltage regulator or its peripheral equipment, and issues an alarm when it is judged that the operation is inoperable. When a switch on the upstream side of the step-controlled reactor, which is the automatic voltage regulator, is turned on while the step-controlled reactor is turned on, the step-controlled reactor is determined to be inoperable when a switch on the upstream side of the step-controlled reactor is turned off by the monitoring and control device. It is an automated power distribution system.

[0008] Claim 2 The invention is The system includes a system status storage device that stores the state of a power distribution system including the state of an automatic voltage regulator, and a monitoring and control device that can control devices in the power distribution system. When an opening and closing operation of a switch is input from the monitoring and control device, the system determines whether or not the automatic voltage regulator or its peripheral devices are to be inoperable based on the state of the power distribution system when the operation is input and the automatic voltage regulator or its peripheral devices are to be damaged by the operation, and issues an alarm when it is determined that the operation is inoperable. and when a switch closing operation is input from the monitoring and control device while the load side is being stepped up or stepped down by the on-load tap changing transformer device, which is the automatic voltage adjustment device, and a closed circuit including the on-load tap changing transformer device is formed by the on-load tap changing transformer device, the device determines that the switch is inoperable. It is an automated power distribution system. Effect of the Invention

[0009] According to the invention described in claim 1, when a switch opening / closing operation is input from the monitoring control device, it is automatically determined whether or not the operation is impossible because there is a risk of damage to the automatic voltage regulator and its peripheral devices by this operation, and if it is determined that the operation is impossible, an alarm is issued. This makes it possible to prevent damage to devices due to the opening and closing of the switch, and further makes it possible to prevent distribution line accidents and improve the reliability and stability of the power supply. Moreover, because this distribution automation system automatically determines whether or not the operation is impossible, it is possible to make an appropriate determination regardless of the experience or attention of the person in charge or operator, and it is also possible to reduce the time and effort required for the determination and confirmation.

[0010] According to the invention described in claim 2, when a switch immediately upstream (before) of the step-controlled reactor device is turned off while there is a charge in the step-controlled reactor device, it is determined that the switch is inoperable and an alarm is issued. In other words, when such a switch is turned off, the switch is damaged, so by determining that the switch is inoperable and issuing an alarm, it is possible to prevent damage to the switch and even a distribution line accident.

[0011] According to the invention described in claim 3, when a switch-on operation is input to form a closed circuit including the on-load tap changing transformer device while the on-load tap changing transformer device is stepping up or stepping down the load side, it is determined that the operation is impossible and an alarm is issued. In other words, when such a closed circuit is formed, the on-load tap changing transformer device burns out, so by determining that the operation is impossible and issuing an alarm, it is possible to prevent damage to the on-load tap changing transformer device and even distribution line accidents. [Brief description of the drawings]

[0012] [Figure 1] 1 is a schematic configuration diagram showing a power distribution automation system according to an embodiment of the present invention. [Diagram 2] 3 is a conceptual diagram showing a first example of determining whether or not an operation is possible by the power distribution automation system of FIG. 1. FIG. [Diagram 3] 1. FIG. 4 is a conceptual diagram showing a second example of determining whether or not an operation is possible by the power distribution automation system of FIG. [Figure 4] 1. FIG. 4 is a conceptual diagram showing a third example of determining whether or not an operation is possible by the power distribution automation system of FIG. [Diagram 5] 1. FIG. 4 is a conceptual diagram showing a fourth example of determining whether or not an operation is possible by the power distribution automation system of FIG. [Figure 6] 1. FIG. 13 is a conceptual diagram showing a fifth example of determining whether or not an operation is possible by the power distribution automation system of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, the present invention will be described based on the illustrated embodiment.

[0014] 1 to 6 show an embodiment of the present invention, and Fig. 1 is a schematic diagram showing a power distribution automation system 1 according to this embodiment. This power distribution automation system 1 is a system that monitors and controls a power distribution system including an automatic voltage regulator, and has a configuration similar to that of the conventional system except that it automatically determines whether or not operation and control are possible, as will be described later. Although a detailed description of the configuration similar to that of the conventional system will be omitted, the system is generally configured as follows.

[0015] That is, the power distribution automation server 2 and the remote control master station (power distribution remote control device) 3 are communicatively connected, and the power distribution automation server 2 and the monitoring and control console (monitoring and control device) 4 are communicatively connected. In addition, remote control slave stations (not shown) attached to each utility pole are communicatively connected to the remote control master station 3, and the opening and closing of switches (remote control switches) 41 on the utility poles is controlled via the remote control slave stations.

[0016] The operating state (distribution system state) of the distribution line L is constantly monitored, and when a power outage occurs due to a distribution line accident, for example, the location of the accident that caused the power outage is identified while controlling the switches 41, etc., and power is distributed (automatic reverse transmission) to the distribution lines L other than the accident section by operation from the monitoring control desk 4 or automatically. In this way, the power outage area is determined by opening and closing the switches 41, etc., and the power outage area and the non-power outage area are separated by the switches 41, etc. In addition, when a power outage occurs due to a substation accident (extra-high voltage accident, momentary voltage drop, etc.), power is distributed (automatic reverse transmission) from the surrounding distribution lines L to the area where the power outage occurred by operation from the monitoring control desk 4 or automatically.

[0017] Here, a distribution automation server 2 is installed in an operation control center C, and a remote control master station 3 and a monitoring control console 4 are installed in each sales office, etc., but in this embodiment, it is assumed that the distribution automation server 2, the remote control master station 3, and the monitoring control console 4 are installed in the operation control center C. In addition, a plurality of loads are arranged to hang from the distribution line L, and a photovoltaic power generation device (distributed power source) 42 is arranged via a switch 41, and further, an SSR (stage control reactor device) 51 and an SVR (on-load tap changing transformer device) 52 are arranged as automatic voltage adjustment devices for properly maintaining and adjusting the voltage of the distribution line L. Specifically, in this embodiment, an SVR 52 is arranged on the upstream side of the photovoltaic power generation device 42, and an SSR 51 is arranged on the downstream side of the photovoltaic power generation device 42.

[0018] Next, the characteristic configuration and functions of the power distribution automation system 1 will be described.

[0019] First, the operation control center C is provided with a system status storage device (database) 21 that stores the distribution system status including the status of the automatic voltage regulator. That is, the current and latest distribution system status obtained by monitoring and the status of each device are written on a distribution system diagram and are stored sequentially in real time in the system status storage device 21. This system status storage device 21 is connected to the distribution automation server 2 so as to be freely accessible.

[0020] The monitoring and control console 4 is a device capable of monitoring the state of the power distribution system on a monitor and capable of controlling (capable of inputting operation commands) the devices and equipment in the power distribution system, and at least one monitoring and control console 4 is provided. For example, by inputting an on or off operation of a predetermined switch 41, the switch 41 can be remotely controlled to be opened or closed.

[0021] In response to this, the power distribution automation server 2 has an operation judgment function that judges whether or not the operation input from the monitoring control console 4 is appropriate. That is, when an operation to open / close (on / off) the switch 41 is input from the monitoring control console 4, the server judges whether or not the operation is to be made impossible because the automatic voltage regulator or its peripheral devices may be damaged by the operation, based on the power distribution system status in the system status storage device 21, and issues an alarm if it is judged that the operation is impossible.

[0022] Specifically, first, when there is a turn-on amount in the SSR 51, if a turn-off operation is input from the monitoring control console 4 to the switch 41 immediately upstream of the SSR 51, it is determined that the operation is not possible. That is, as shown in Fig. 2, when the SSR 51 is in the "automatic" or "manual, turn-on amount ≠ 0" state, the turn-off operation to the switch 41-1 installed immediately upstream of the SSR 51 on the distribution line L (immediately in front of the SSR 51) is determined to be inoperable, and an alarm is issued to the monitoring control console 4 etc. without executing the operation.

[0023] This is because when the SSR 51 is turned on, it is in a state where the reactor generates reactive power in the distribution line L to adjust the voltage, and if the switch 41-1 is turned off in this state, the delayed current caused by the reactive power of the SSR 51 is cut off, causing an abnormal voltage to be generated in the switch 41-1. In other words, a current chopping phenomenon occurs, and the switch 41-1 is broken or damaged by the abnormal voltage, and furthermore, a distribution line accident occurs, causing a power outage in the target distribution line L.

[0024] Here, the alarm may be any type of alarm, but may be a warning message displayed on a monitor such as the monitoring and control console 4, or an alarm sound generated from a speaker such as the monitoring and control console 4. Also, the switch 41-2 in Fig. 2 is a switch that is disposed on the distribution line L integrally with the SSR 51 (disposed so as to hang down) in order to connect / disconnect the SSR 51 to the distribution line L, and is not a switch immediately upstream of the SSR 51 on the distribution line L.

[0025] Secondly, when the load side is being stepped up or down by the SVR 52 and an ON (close) operation of the switch 41 is input from the monitoring and control console 4, and this ON operation forms a closed circuit including the SVR 52, it is determined that the operation is inoperable. That is, as shown in Fig. 3, when the load side is being stepped up or down by the SVR 52 (SVR 52 is in the automatic mode), and a closed circuit including the SVR 52 is formed by closing the switch 41-13, etc., it is determined that the ON operation of the switch 41-13, etc. is inoperable, and this operation is not executed and an alarm is issued to the monitoring and control console 4, etc.

[0026] This is because the load side voltage is increased or decreased by the SVR 52, and for example, when the switch 41-13 is closed while the switches 41-11 and 41-12 are in the on state, a voltage is induced across both ends of the SVR 52 (between the primary and secondary). Then, the induced voltage is applied to the closed circuit including the SVR 52 (because the impedance of the closed circuit is small), causing a large current I to flow. This causes the SVR 52 to burn out or become damaged, and further causes a distribution line accident, resulting in a power outage of the target distribution line L.

[0027] Therefore, such a judgment / check is performed for all switches 41 that can form a closed circuit including the SVR 52 when turned on. For example, in the case of a three-unit suspension as shown in Fig. 4, the check range / targets are three switches 41 that can form a closed circuit including the SVR 52 when turned on. In this case, one closed circuit can be formed by the switches 41-11, SVR 52, switch 41-12, and switch 41-13, and it is judged whether this closed circuit is formed.

[0028] 5, in the case of four-unit suspension, the check range and targets are four switches 41 that can form a closed circuit including the SVR 52 by being turned on. In this case, two closed circuits can be formed: a closed circuit of switch 41-11, SVR 52, and switch 41-13, and a closed circuit of switch 41-12, switch 41-14, and SVR 52, and it is determined whether these closed circuits are formed.

[0029] 6, in the case of a five-unit suspension, the check range and targets are five switches 41 that can be turned on to form a closed circuit including the SVR 52. In this case, three closed circuits can be formed: a closed circuit of the switch 41-11, SVR 52, and switch 41-13; a closed circuit of the switch 41-12, switch 41-14, and SVR 52; and a closed circuit of the switch 41-11, SVR 52, switch 41-12, and switch 41-15. It is determined whether these closed circuits are formed.

[0030] According to the power distribution automation system 1 configured as above, when an opening / closing operation of the switch 41 is input from the monitoring and control console 4, it is automatically determined whether or not the operation is impossible because the automatic voltage regulator and its peripheral devices may be damaged by the operation. If it is determined that the operation is impossible, the operation is not performed (the switch 41 is not opened or closed) and an alarm is issued to the monitoring and control console 4 or the like. This makes it possible to prevent equipment from being damaged by opening and closing the switch 41, and further to prevent distribution line accidents and improve the reliability and stability of the power supply. Moreover, since the power distribution automation system 1 automatically determines whether or not the operation is impossible, it is possible to make an appropriate determination regardless of the experience or attention of the person in charge or operator, and it is also possible to reduce the time and effort required for the determination and confirmation.

[0031] Specifically, when there is a charge in the SSR 51 and a cut operation is input to the switch 41 immediately upstream (before) the SSR 51, it is determined that the switch is inoperable and an alarm is issued. That is, when such a cut operation of the switch 41 is executed, the switch 41 is damaged, so by determining that the switch is inoperable and issuing an alarm, it is possible to prevent damage to the switch 41 and even a distribution line accident.

[0032] Furthermore, when the load side is being stepped up or down by the SVR 52, if an operation to turn on the switch 41 that forms a closed circuit including the SVR 52 is input, the switch is determined to be inoperable and an alarm is issued. In other words, if such a closed circuit is formed, the SVR 52 will burn out, so by determining that the switch is inoperable and issuing an alarm, it is possible to prevent damage to the SVR 52 and even accidents on the power distribution line.

[0033] Although the embodiment of the present invention has been described above, the specific configuration is not limited to the above embodiment, and even if the design is changed within the scope of the present invention, it is included in the present invention. For example, in the above embodiment, the case where the power distribution automation server 2 is provided with an operation determination function has been described, but the monitoring control console 4 or other devices may be provided with an operation determination function. Also, the case where only the on / off operation of a specific switch 41 is input from the monitoring control console 4 has been described, but when a series of operation procedures is input from the monitoring control console 4, it may be determined whether or not there is an operation that may cause equipment damage as described above among the series of operation procedures, and if there is, it may be determined that the operation is not possible and an alarm may be issued. [Explanation of symbols]

[0034] 1. Power distribution automation system 2. Power distribution automation server 21 System status memory device 3 Remote control master station (power distribution remote control device) 4. Monitoring and control console (monitoring and control device) 41 Switchgear 51 SSR (Step-Controlled Reactor, Automatic Voltage Regulator) 52 SVR (on-load tap changing transformer, automatic voltage regulator)

Claims

1. A system status storage device that stores a distribution system status including a status of an automatic voltage regulator; A monitoring and control device capable of controlling devices in a power distribution system; when an opening / closing operation of a switch is input from the monitoring control device, the automatic voltage regulator or its peripheral devices are damaged by the operation, and therefore it is determined whether the operation is impossible based on the state of the power distribution system, and an alarm is issued when it is determined that the operation is impossible, When a switch on the upstream side of the step-controlled reactor, which is the automatic voltage regulator, is turned off from the monitoring control device while there is an input amount in the step-controlled reactor, the step-controlled reactor is determined to be inoperable. A power distribution automation system comprising:

2. A system status storage device that stores a distribution system status including a status of an automatic voltage regulator; A monitoring and control device capable of controlling devices in a power distribution system; when an opening / closing operation of a switch is input from the monitoring control device, the automatic voltage regulator or its peripheral devices are damaged by the operation, and therefore it is determined whether the operation is impossible based on the state of the power distribution system, and an alarm is issued when it is determined that the operation is impossible, When the load side is stepped up or down by the on-load tap changing transformer device, which is the automatic voltage regulator, and a switch closing operation is input from the monitoring and control device, and a closed circuit including the on-load tap changing transformer device is formed by the on-load tap changing transformer device, the device is determined to be inoperable. A power distribution automation system comprising:

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