JPH06269138A - Monitoring and control system for voltage regulating device - Google Patents

Abstract

PURPOSE:To stably control a voltage, to make the life of a voltage regulating device long an to enhance the quality of electric power by a method wherein individual voltage regulating device for a wiring line are provided with monitoring and control means coupled by a communication circuit and a voltage regulating operation and its operating timing are controlled so as to give priority to the voltage regulating device close to a power supply. CONSTITUTION:Voltage regulating and control means 8 for individual voltage regulating devices 5 in a distribution line perform the tap changeover operation of voltage transformation part 7 at a time delay by the portion of the communication response processing time of monitoring and control means 9 when voltages on the primary side and the secondary side of the voltage transformation parts 7 deviate from a permissible error range. A remote monitoring sensor 11 transmits a temporary standby instruction to the other voltage regulating devices 5 so as to give priority to the operation of the voltage regulating device 5 close to a power supply 1 when information on all the voltage regulating devices 5 have been operated and processed and a sudden change is caused in a load 12. The monitoring and control means 9 for the voltage regulating devicess 5 which have received the temporary standby instruction perform a standby processing operation, they perform an operation and a processing operation so as to suppress an inessential voltage adjusting operation, and they instruct a tap changeover operation to the voltage regulating and control means 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voltage control system for a voltage regulator of a distribution line, and more particularly to a mutual regulation of a plurality of voltage regulators existing in the same power distribution system.

[0002]

2. Description of the Related Art In a conventional voltage regulator, taps are switched on the basis of voltage / current information collected by each voltage regulator to control the secondary voltage to be constant. For example, in Japanese Patent Laid-Open No. 57-20819, when a common line voltage regulator is used to adjust a power supply circuit in which the voltage changes slowly and a power supply circuit in which the voltage temporarily changes suddenly, the detected current value of the voltage change circuit is changed. When a predetermined value is reached, a switching command signal is output, and when the detector output side detected voltage value reaches a predetermined value, control signals issued at two different delay times are switched and used for voltage adjustment. Further, in Japanese Patent Application Laid-Open No. 58-62712, the effective values of the voltage and current detected from the line are AD-converted, the calculation is performed in the calculation storage device, and the tap operation command of the voltage regulator is generated according to the calculation output.

[0003]

As described above, conventionally, each of the voltage adjusting devices individually adjusts the voltage to control the secondary side voltage to be constant. For example, the first, second, and third voltage regulators are arranged in series from the power source side at a distance, and there are many parallel power supply paths between the respective devices.
It is assumed that a sudden load increase occurs in the parallel power supply path between the second and third voltage regulators and the secondary voltages of the first, second, and third voltage regulators all suddenly decrease. Then, since each of these voltage regulators simultaneously adjusts the secondary voltage rise, the required adjustment time is several minutes, which is quite long. Therefore, the secondary voltage of the second voltage regulator is compensated for by the first voltage regulator. As a result, the voltage is increased by the amount corresponding to the voltage, and the secondary voltage of the third voltage adjusting device is increased by the total amount of the compensation voltages of the first and second voltage adjusting devices. And the second and third voltage regulators are 2
Although the secondary voltage drop adjustment is performed, the secondary voltage of the third voltage regulator is reduced further by the compensation voltage of the second voltage regulator. Third by detecting this
The voltage regulator of 1 must perform the secondary voltage rise regulation again. As described above, the voltage adjusting device arranged farther from the power source side has a larger number of times of voltage adjusting operations, and the voltage management of the power distribution system becomes complicated, and the voltage adjusting device is severely deteriorated and the quality of electric power is significantly deteriorated.

An object of the present invention is to provide a supervisory control system for a voltage regulator, which enables stable voltage management of a distribution system, a long life of the voltage regulator, and an improvement in the quality of electric power. is there.

[0005]

In order to achieve the above-mentioned object, each of the voltage adjusting devices, which are arranged in a distributed manner on a power distribution line and have a voltage adjusting control means for independently controlling the device itself, is further connected by a communication circuit. The monitoring control means is provided, and the voltage adjustment operation of each device and the timing of the operation are adjusted according to the monitor control command of the other device. in this case,
A system including a remote monitoring center device that collects information from each monitoring control unit, performs arithmetic processing, sends a monitoring control command to each monitoring control unit, and controls the voltage adjustment operation and the timing of the operation, and each monitoring method. There is a method in which the control unit issues a monitoring control command to another device based on the information collected by the own device and controls both the voltage adjustment operation and the timing of the operation. In any case, the voltage adjusting operation of the voltage adjusting device close to the power supply is prioritized to control the voltage adjusting operation and the timing of the operation.

[0006]

The voltage regulators dispersedly arranged on the power distribution line are controlled by the voltage regulation control means for independently controlling the device itself to compensate for the voltage drop on the power distribution line. In this case, a large number of branch paths may be provided on the way, but when a plurality of voltage regulators are connected in series, the result of voltage regulation of the voltage regulator close to the power source will be at a position far from the power source. It affects the primary voltage of the arranged voltage regulator and thus its secondary voltage. Therefore, when the series voltage regulator performs the simultaneous voltage regulation work, the voltage pulsation frequency becomes higher as the voltage regulator is located farther from the power source. By adding monitoring control means connected to each voltage adjusting device by a communication circuit, the voltage adjusting work that requires several minutes to complete the voltage adjusting operation of the device itself is performed by adjusting the voltage further from the power supply. It becomes possible for the device to issue information or a command to suspend the process for a while, and at the same time, when the command is received, it is possible to control so as to suspend the voltage adjustment work of the device itself. This suppresses voltage pulsation. The system that collects the device status monitoring information from each voltage regulator in the remote monitoring center device and performs arithmetic processing and issues a temporary waiting command to each voltage regulator by name is one of the voltage regulator monitoring and control systems. There is another method of the supervisory control system of the voltage regulator, in which each voltage regulator directly issues a temporary suspension command only to the voltage regulator located farther from the power source than the voltage regulator itself. . The condition range of the distribution system to which either method is applied is almost the same.

[0007]

EXAMPLE A first example will be described with reference to FIGS. FIG. 1 is a configuration diagram of a distribution system to which the present invention of a system including a remote monitoring center device is applied. A power transformer (TR) 1 installed in a substation is connected to a distribution line 3 via a distribution bus 2 arranged on the secondary side thereof. On the distribution line 3, a pole switch (DM ₁ , DM ₂ , DM ₃ , DM ₄ ) 4 and a voltage regulator (VR ₁ , VR ₂ , VR ₃ ) 5 are installed in series, but for distribution A large number of branch distribution lines 6 may be connected between the bus bar 2 and each voltage regulator 5. The pole switch 4 is arranged in order to change the distribution path, and in this embodiment, the first to third pole switches (DM ₁ , DM ₂ , D).
Since M ₃ ) 4 is the normally closed point and the fourth pole switch (DM ₄ ) 4 is the normally open point, the current distribution system is the fourth pole switch DM.
₄ is the end. The voltage regulator 5 is a transformer (TR
F) 7, voltage adjustment control means (VC) 8 and monitor control means (RC) 9. Supervisory control means (RC) 9
Through the communication circuit 10 the remote monitoring center device (RM) 1
Connected to 1. A load (LD) is placed at the end of the branch distribution line 6.
12 are connected. The communication circuit 10 is the distribution line 3
It does not matter whether it is formed by superimposing it on top or by laying another line.

FIG. 2 is a block diagram of the voltage regulator (VR) 5. 1 of the transformer section (TRF) 7 whose primary side is the side of the power transformer (TR) 1 shown by a virtual line and whose opposite side is the secondary side
From the secondary side and the secondary side line section to the instrument transformer 1 respectively
A voltage adjustment control unit (VC) 8 for reading a voltage value via 3 and 14 and performing voltage adjustment control, and an adjacent voltage adjustment device (VR) connected to the voltage adjustment control unit (VC) 8 via a communication line 10. 5 or remote monitoring center equipment (RM)
The monitoring control means (RC) 9 connected to 11 is surrounded by a dotted line. The voltage adjustment control means (VC) 8 includes the instrument transformers 13 and 14, an A / D converter 15 that AD-converts the taken-in voltage value, and a reference voltage setter (which sets a predetermined reference voltage value). VSR) 16, digital signal of A / D converter 15 and reference voltage setting device (VSR) 1
The value of 6 is compared to select the position of the tap, and the voltage regulator controller (VRC) 17 that generates the command signal and the tap switching instruction signal of the voltage regulator controller (VRC) 17 are transmitted via the switch 18. It comprises a tap changer (TCR) 19 which receives and executes the tap change of the transformer unit (TRF) 7. The monitoring control means (RC) 9 receives information from the voltage adjustment control means (VC) 8 and receives the remote monitoring center device (R).
M) 11 to generate report data or to generate and transmit a control signal of the voltage adjustment control means (VC) 8 based on a monitor control command signal from the remote monitoring center device (RM) 11 and send the monitor command control unit. The communication circuit 1 receives the report information from the (CTR) 20 and the monitor command controller (CTR) 20.
A transmitter (TMR) 21 for transmitting information to 0 and a receiver (RVR) 22 for receiving a monitoring control command from the remote monitoring center device (RM) 11 and transmitting the command to the monitoring command control unit (CTR) 20. Composed of.

The operation of the supervisory control system of the voltage regulator in this embodiment will be described. FIG. 3 is a line voltage characteristic diagram for explaining a distribution line voltage fluctuation at the time of a sudden load change in a distribution system in which three voltage regulators (VR) 5 are arranged in series. “CASE 1. Normal” indicates that each voltage regulator (VR) 5 is performing voltage adjustment so as to maintain a constant voltage during normal times. “CASE 2. When load rapidly increases” means that each voltage regulator (VR) 5 immediately after the load (LD) 12 connected to the branch distribution line 6 intermediate between the second and third voltage regulators VR ₂ and VR ₃ suddenly increases. Shows the state of the line voltage before the voltage adjustment operation is started. “CASE3. In individual compensation operation” means that the line voltage immediately after completion of the secondary voltage increase adjustments performed by the individual voltage regulators (VR) 5 at the same time without the monitor control means (RC) 9 operating. , Which is the case when encountered in the prior art. "C
ASE4. During the monitor control operation, the monitor control system of the voltage regulator according to the present invention is operated to perform the secondary voltage rise adjustment only in the first voltage regulator VR ₁ , and the other voltage regulators VR ₂ and VR ₃ are The line voltage state immediately after the completion of the adjustment operation of the first voltage regulator VR ₁ when the voltage adjustment work is temporarily suspended on the basis of the temporary control command of the supervisory control command is shown. The secondary voltages of the second and _third voltage regulators VR ₂ and VR ₃ are out of the reference voltage set value, and the second voltage regulation operation is required. flowchart showing a time change of each voltage regulator (VR) 5 of the secondary voltage. the first voltage regulator VR ₁ is once, second
Voltage regulator VR ₂ of the two, and the third voltage regulator VR ₃ of shows that have to be made secondary voltage adjustment operation 3 times. In the case of CASE4, the first
The voltage regulator VR ₁ of the second voltage regulator V 1
R ₂ is one time offset with respect to the first voltage regulator VR ₁ , and three times with the third voltage regulator VR ₃ is 0 times.
Secondary voltage adjustment work is required.

The control operation of the supervisory control system of the voltage regulator for realizing "CASE 4. State during supervisory control operation" will be described. With reference to FIGS. 1 and 2, the voltage adjustment control means (VC) 8 of each voltage adjustment device (VR) 5 converts the voltage on the primary side and the secondary side of the transformer unit (TRF) 7 into a transformer 13 for an instrument. , 14 and read it through the A / D converter 15 to convert it to digital data, and the voltage regulator controller (VRC)
17 and the monitoring command control unit (CTR) 20 in the monitoring control means (RC) 9. Voltage regulator controller (VR
C) 17 is a preset reference voltage setting device (VS
R) 16 reference voltage value and the digital data received from the A / D converter 15 are compared, and a predetermined allowable error (deviation from the reference voltage setting value for judging that the tolerance is equal to the reference voltage setting value) In the case of deviation from the range of (limit value of), after a time delay (usually several ms) corresponding to the communication time of the necessary monitoring control means (RC) 9, the tap changer (TCR).
A tap switching command is issued to 19. The tap changer (TCR) 19 immediately executes the tap change operation of the transformer unit (TRF) 7, but is protected so that the next tap change command does not arrive during the tap change operation. Supervisory control means (RC)
The monitoring command control unit (CTR) 20 of 9 edits the device status monitoring information according to the timing of transmitting the device status monitoring information of its own device, and delivers it to the transmitter (TMR) 21. Transmitter (T
The MR) 21 sends a signal to the remote monitoring center device (RM) 11. The distant monitoring center device (RM) 11 receives the information of all the voltage regulators (VR) 5 and performs arithmetic processing on the voltage regulators (VR) 5 that require temporary processing for the voltage regulation work. The temporary order command is transmitted with an address. The receiver (RVR) 22 of the voltage regulator (VR) 5 that has received the temporary wait command with the address specified transmits the temporary wait command signal to the monitoring command controller (CTR) 20. The monitoring command control unit (CTR) 20 sends a control signal to the voltage adjustment control unit (VC) 8, and the voltage adjustment control unit (VR)
C) 17 and the tap changer (TCR) 19 are turned off for a predetermined time, and the voltage adjustment controller (VRC) 17 sends the tap changeover signal to the tap changer (TC).
R) to prevent transmission to 19.

The operation of the supervisory control system of the voltage regulator is performed by the voltage regulator (VR) 5 which is far from the power source, that is, the second,
The case where only the temporary adjustment process of the third voltage regulators VR ₂ and VR ₃ is executed has been described.
As can be seen with reference to time monitoring control operation ", briefly postponed treatment only with the second, would be a third voltage regulator VR _1, VR ₂ becomes two-stage operation, be desirable from the standpoint of power quality In order to solve this problem, the monitor command controller (CTR) 20 receives the voltage information together with the temporary wait command, calculates the residual voltage deviation, and calculates the residual voltage deviation, and adjusts the tap change command for adjusting the corresponding value. 3 is directly transmitted to the tap changer (TCR) 19 of the voltage adjustment control means (VC) 8. As a result, one tap changeover operation of the plurality of voltage adjustment devices (VR) 5 simultaneously causes the operation shown in FIG. C
ASE1. It is possible to recover the “normal state”.

FIG. 5 shows a processing flow of the monitoring command control unit (CTR) 20, and FIG. 6 shows a processing flow of the remote monitoring center device (RM) 11. The monitoring command control unit (CTR) 20 of the monitoring control means (RC) 9 that has received the monitoring control command from the remote monitoring center device (RM) 11 immediately executes the processing according to the type of the monitoring control command. In the case of the device state monitoring command, the power supply direction at that time, the primary voltage, the secondary voltage, the reference voltage setting value, the allowable error setting value, the switch 18
ON / OFF state, tap switching method (automatic or manual?), Tap switching operating state (is tap switching operating?),
Also, the data of the tap position is collected, the reporter data is edited by adding the transmitter address, and the edited report data is transmitted to the transmitter (TMR) 21. In the case of a temporary suspension command, the device status report data at the time when the command of the voltage regulator (VR) 5 on the power supply side is issued from the own device and the device status report data at the time immediately before that are used. Then, it is necessary to issue a tap switching command at this point in time, and which tap position should be switched if necessary, is calculated, and the switch 18 is instructed to be turned off to temporarily suspend the operation. It outputs a switching instruction and waits for a predetermined time to elapse. After a lapse of a predetermined time, the switch 18 is instructed to be turned on to end the temporary discontinuation state, the timer is reset, and the report data of the temporary waiting period process end is edited and transmitted to the transmitter (TMR) 21. In the case of a setting change command, the switch 18 is turned off to prevent erroneous processing during the setting value change process, and then the setting values, that is, the power supply direction, the reference voltage setting value, the allowable error setting value, and the tap switching method are set. Correct based on change order. When the set value changing process is completed, the switch 18 is turned on to edit the set value changing process completion report data and transmit it to the transmitter (TMR) 21. If there is neither a temporary suspension command nor a setting change command, only the data of the immediately preceding power supply side voltage regulator (VR) 5 is stored. The processing of the remote monitoring center device (RM) 11 will be described. While the remote monitoring center device (RM) 11 continues the monitoring operation, a device status monitoring command is periodically issued to report the current status of each device. A pole switch (DM) 4 is included in each device in this case.
Can be included. When at least all information from each voltage regulator (VR) 5 is collected, arithmetic processing is performed to determine whether a temporary waiting period command is necessary or a setting change command is necessary. If a temporary waiting period command is required, the voltage regulator (VR) 5 in which the voltage drop has occurred is defined as the device subject to the temporary waiting period command transmission except for the one voltage regulator (VR) closest to the power supply Send the term command. If the setting value change process is required, a setting change command is issued and the process returns to the device state monitoring process in the next cycle.

The operation description based on FIGS. 5 and 6 is 1
By way of example only, various variations may exist within the principles and scope of the present invention. For example, a remote monitoring center device (R
Although the device status monitoring report has been described based on the monitoring control command of M) 11, it does not matter if each device automatically sends the report data at a predetermined timing. Alternatively, there may be a method in which each device constantly monitors its own device and reports when a temporary waiting period command is required. In addition, the normally open point of the pole switch (DM) is, for example, the fourth pole switch (DM).
₄ ) In the case of moving from 4 to the 3rd pole switch (DM ₃ ) 4, the power supply direction of the 3rd voltage regulator (VR ₃ ) 5 changes from left to right. Is automatically reported to the distant monitoring center device (RM) 11 by the operation of the pole switch (DM) 4, and it is reported to each voltage adjusting device (VR).
It is also possible to automatically contact 5 (which may be unnecessary). Alternatively, the result of the state change of the pole switch (DM) 4 can be used as a remote monitoring center device (R
There may be a method of manually inputting into M) 11 and each voltage regulator (VR) 5. Furthermore, the switch 18 is used to temporarily suspend the process.
However, instead of this, a method of temporarily changing the allowable error setting value to a large value or a method of temporarily changing the tap switching method to manual is possible. Strictly speaking, the types of collected data and setting values are not limited to those listed here, and it is not necessary to process all of the items listed here. There can be various variations in the processing steps.

By taking such measures, unnecessary voltage adjustment operation of the voltage adjustment device (VR) 5 is suppressed, stable voltage control of the power distribution system becomes possible, and unnecessary increase in the number of operations is prevented. As a result, it is possible to prolong the life of the voltage regulator and improve the quality of power by preventing the voltage regulator from deteriorating as the number of operations increases.

Next, a second embodiment will be described with reference to FIG. As can be seen by comparing with FIG. 1, in appearance, the remote monitoring center unit (RM) is simply omitted. For this reason, each voltage regulator (VR) 5 has a remote monitoring center unit (R).
It is necessary for the entire voltage regulator (VR) 5 to share the function processed by M). The voltage regulator (V
Although the configuration diagram of R) 5 is not changed as long as it is shown, a difference occurs in the processing content of the monitoring command control unit (CTR) 20. The processing flow is shown in FIG. Basically, the processing function of the distant monitoring center device (RM) and the monitoring command control unit (CTR) 20 of the voltage adjustment control means (RC) 9 in the monitoring control system of the voltage adjustment device including the distant monitoring center device (RM). Both of the processing functions, that is, the functions obtained by combining the functions of the processing flows of FIGS. 6 and 5 are provided in the processing functions of the monitor command control unit (CTR) 20. Instead of issuing the device status monitoring command of the remote monitoring center device (RM), the monitoring command control unit (CTR) 20 voluntarily matches the monitoring data transmission cycle with the device status monitoring data (power supply direction, The primary / secondary voltage, the reference voltage setting value, the allowable error setting value, the switch state, the tap switching method, the switching operation state, and the tap position) are collected and the arithmetic processing is performed. Then, it is determined whether or not it is necessary to transmit the temporary suspension command, and the transmission data to the voltage regulator (VR) 5 located farther from the power source than the own device, that is, the monitoring data of the own device, the temporary data. The necessary transmission data is edited in the waiting instruction and the setting change instruction, and the transmission procedure is adopted. The processing flow in the case of receiving the temporary waiting period command, in the case of receiving the setting change command, and in the case of receiving only the monitoring data is the same as in the case of FIG. However, the address of the transmission data of the processing completion is not the remote monitoring center device (RM) but the voltage adjusting device (VR) 5 arranged on the power source side up to the voltage adjusting device (VR) 5 which issued the command. The above description of the operation is only an example, and various variations may exist within the principle and scope of the present invention, and the effect thereof is that the monitoring control system of the voltage regulator including the remote monitoring center device (RM) is provided. Is the same as.

[0016]

According to the present invention, the voltage adjusting device provided with the voltage adjusting control means is further provided with the monitor controlling means connected by the communication circuit, so that the voltage adjusting apparatus is arranged at a position farther from the power supply. Temporary operation processing can be performed, unnecessary voltage adjustment operation can be suppressed, stable voltage management of the distribution system can be achieved, and long life of the voltage adjustment device and improvement of power quality can be achieved. .

[Brief description of drawings]

FIG. 1 is a configuration diagram of a distribution system to which the present invention of a remote monitoring center device installation system is applied.

FIG. 2 is a configuration diagram of a voltage regulator according to the present invention.

FIG. 3 is a line voltage characteristic diagram illustrating a change in a distribution line voltage when a load suddenly changes in a distribution system in which a voltage regulator is arranged in series.

FIG. 4 is a voltage regulator 2 arranged in series at the time of sudden load change when the supervisory control system of the voltage regulator is not operated.
It is a time characteristic diagram of the next voltage.

FIG. 5 is a process flow diagram of a monitoring command control unit in the monitoring control system of the voltage adjustment device of the remote monitoring center device installation method.

FIG. 6 is a processing flow chart of a remote monitoring center device.

FIG. 7 is a configuration diagram of a power distribution system to which the present invention of a remote monitoring center device non-installed system is applied.

FIG. 8 is a processing flow diagram of a monitoring command control unit in the monitoring control system of the voltage adjusting device without the remote monitoring center device installed.

[Explanation of symbols]

 1 Power Transformer (TR) 3 Distribution Line 5 Voltage Regulator (VR) 7 Transformer (TRF) 8 Voltage Adjustment Control Means (VC) 9 Monitoring Control Means (RC) 10 Communication Circuit 11 Remote Monitoring Center Equipment (RM) 13 Primary-side instrument transformer 14 Secondary-side instrument transformer 17 Voltage regulator control unit (VRC) 19 Tap changer (TCR) 20 Monitoring command control unit (CTR) 21 Transmitter (TMR) 22 Receiver (RVR) )

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuru Nakamura 1-1-1 Kokubun-cho, Hitachi-shi, Ibaraki Hitachi Kokubun Plant, Ltd.

Claims (4)

[Claims] 1. A voltage adjusting device, which is provided in a distributed manner on a power distribution line and has a voltage adjusting control device for independently controlling the device itself, further comprises a monitoring control device connected by a communication circuit, and another device. A supervisory control system for a voltage regulator, wherein the voltage regulator operation of each device and the timing of the operation are adjusted in accordance with the supervisory control command. 2. The voltage adjusting operation according to claim 1, wherein information is collected from the monitor control means provided in each of the voltage adjusting devices, arithmetic processing is performed, and a command is sent to each monitor control means. A monitoring control system for a voltage regulator, comprising a remote monitoring center device for controlling the timing of the operation. 3. The voltage control device according to claim 1, wherein the monitor control means provided in each of the voltage adjusting devices issues a monitor control command to another device based on the collected information in the device itself, and the voltage adjusting operation and the operation of the voltage adjusting operation. A supervisory control system for a voltage regulator, characterized by controlling timing and the like. 4. The voltage adjusting device according to claim 1, wherein the voltage adjusting operation of the voltage adjusting device close to the power supply is prioritized to control the voltage adjusting operation and the timing of the operation. Supervisory control system.