JP3044640B2 - Monitoring and control system for voltage regulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates relates to a monitoring and control system of the voltage regulator in the power distribution line, and in particular the mutual adjustment of a plurality of voltage regulator that is present in the same distribution system.

[0002]

2. Description of the Related Art In a conventional voltage regulator, taps are switched based on voltage / current information collected by each of the voltage regulators, and control is performed so that a secondary voltage is constant. For example, in Japanese Patent Application Laid-Open No. 57-20819, when a power supply circuit in which the voltage changes slowly and a power supply circuit in which the voltage temporarily changes suddenly are adjusted by a common line voltage regulator, the detection current value of the voltage sudden change circuit is adjusted. When a predetermined value is reached, a switching command signal is output, and when the regulator output-side detected voltage value reaches a predetermined value, voltage control is performed by switching between two types of control signals generated with different delay times. In Japanese Patent Application Laid-Open No. 58-62712, the effective value of the voltage / current detected from the line is A / D-converted, the calculation is performed by a calculation storage device, and a tap operation command of the voltage regulator is generated according to the calculation output.

[0003]

As described above, conventionally, each voltage regulator individually controls the voltage to control the secondary voltage to be constant. For example, the first, second, and third voltage regulators are sequentially arranged in series from the power supply side at a distance, and there are many parallel power supply paths between the respective devices,
It is assumed that a sudden increase in the load occurs in the parallel power supply line between the second and third voltage regulators, and that the secondary voltages of the first, second, and third voltage regulators all suddenly decrease. Then, since these voltage regulators simultaneously perform the secondary voltage rise adjustment simultaneously, the time required for the adjustment is considerably long as several minutes, so that the secondary voltage of the second voltage regulator is compensated by the first voltage regulator. As a result, the secondary voltage of the third voltage regulator is raised by the sum of the compensation voltages of the first and second voltage regulators. And the second and third voltage regulators are 2
The secondary voltage drop adjustment is performed, but the secondary voltage of the third voltage regulator is further reduced by the compensation voltage of the second voltage regulator. When this is detected,
Must perform secondary voltage rise adjustment again. In this way, as the voltage regulator is located farther from the power supply, the number of times of voltage regulation increases, the voltage management of the distribution system becomes complicated, the voltage regulator is greatly deteriorated, and the quality of power is remarkably deteriorated.

[0004] It is an object of the present invention to provide a voltage regulator monitoring and control system that enables stable voltage management of a power distribution system, prolongs the life of the voltage regulator, and improves power quality. is there.

[0005]

In order to achieve the above object, the present invention is directed to a plurality of power supply units which are distributed in a distribution line connected to a power supply and which transforms the voltage of the distribution line by a transformer.
A voltage regulator, wherein the plurality of voltage regulators are
Voltage adjustment control means for adjusting the output voltage of the transformer,
Connected to the device via a communication circuit,
Outputting a command based on information to the voltage adjustment control means
Monitoring control means for monitoring and controlling each of the voltage regulators.
The means preferably belongs to a voltage regulator close to the power supply.
First, a finger to adjust the voltage at the specified timing
Monitoring of the voltage regulator characterized by outputting a command
This is a configuration of the control system.

[0006]

The voltage regulators distributed in the distribution line are controlled by voltage regulation control means for independently controlling the device, and compensate for the voltage drop in the distribution line. In this case, a number of branch paths may be provided in the middle, but if a plurality of voltage regulators are connected in series, the result of the voltage regulation of the voltage regulator close to the power supply will be located as it is far from the power supply. It will affect the primary voltage of the voltage regulator arranged, and thus its secondary voltage as well. Therefore, when the series voltage regulator performs the simultaneous voltage regulation operation, the voltage pulsation frequency increases as the voltage regulator is farther from the power supply. By adding monitoring and control means connected to each voltage regulator by a communication circuit, the voltage regulation operation, which requires several minutes for its own device to complete the voltage regulation operation, is farther away from the power supply. It is possible to transmit information or a command to temporarily suspend the device, and at the same time, it is possible to control to temporarily suspend the voltage adjustment work of the own device when the command is received. This suppresses voltage pulsation. The method of collecting the device state monitoring information issued from each voltage regulator at the remote monitoring center device and performing an arithmetic process, and issuing a temporary waiting command by name to each voltage regulator is a system of the voltage regulator monitoring and control system. A method in which each voltage regulator directly issues a temporary waiting command only to a voltage regulator located farther from the power supply than the own device is another method of monitoring and controlling the voltage regulator. . The condition range of the distribution system to which both systems are applied is almost the same.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment 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. A pole switch (DM1, DM2, DM3, DM4) 4 and a voltage regulator (VR1, VR2, VR3) 5 are installed in series on the distribution line 3, but the distribution bus 2 and each voltage regulator are installed. A large number of branch distribution lines 6 can be connected to the middle of the line 5. The pole switch 4 is arranged so that the distribution path can be changed. In this embodiment, the first to third pole switches (DM1, DM2, DM
3) Since 4 is a normally closed point and the fourth pole switch (DM4) 4 is a normally open point, the current distribution system is the fourth pole switch DM4.
Is at the end. The voltage regulator 5 is a transformer (TRF)
7, voltage adjustment control means (VC) 8, and monitoring control means (R
C) 9). The monitoring control means (RC) 9 is connected to a remote monitoring center device (RM) 11 through a communication circuit 10. A load (LD) 12 is provided at the end of the branch distribution line 6.
Is connected. The communication circuit 10 may be configured to be superimposed on the distribution line 3 or may be provided with another line.

FIG. 2 is a configuration diagram of the voltage regulator (VR) 5. One of the transformers (TRF) 7 having the primary side on the side of the power transformer (TR) 1 and the secondary side on the opposite side indicated by a virtual line.
Instrument transformers 1 from the primary and secondary line sections respectively
A voltage adjustment control means (VC) 8 for reading a voltage value through 3 and 14 and performing voltage adjustment control, and a voltage adjustment device (VR) connected to the voltage adjustment control means (VC) 8 and connected via a communication line 10 5 or remote monitoring center equipment (RM)
The monitoring control means (RC) 9 connected to 11 is shown surrounded by a dotted line. The voltage adjustment control means (VC) 8 comprises the above-mentioned instrument transformers 13 and 14, an A / D converter 15 for performing A / D conversion of the taken voltage value, and a reference voltage setting device (for setting a predetermined reference voltage value). VSR) 16, a digital signal of the A / D converter 15, and a reference voltage setting unit (VSR) 1.
6, a tap position is selected by selecting the tap position, and a voltage regulator control unit (VRC) 17 for generating a command signal, and a tap switching instruction signal of the voltage regulator control unit (VRC) 17 are transmitted via a switch 18. And a tap changer (TCR) 19 for receiving and changing the tap of the transformer 7. The monitoring control means (RC) 9 receives information from the voltage adjustment control means (VC) 8 and receives the information from the remote monitoring center device (R).
M) a monitoring command control unit that generates report data to 11 or generates and transmits a control signal of voltage adjustment control means (VC) 8 based on a monitoring control command signal from remote monitoring center device (RM) 11 (CTR) 20 and the report information from the monitoring command control unit (CTR) 20
And a receiver (RVR) 22 for receiving a monitoring control command from the remote monitoring center device (RM) 11 and transmitting the command to a monitoring command control unit (CTR) 20. Consists of

The operation of the monitoring and control system for the voltage regulator according to the present embodiment will be described. FIG. 3 is a line voltage characteristic diagram for explaining 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 the voltage regulator (VR) 5 is performing voltage adjustment so as to maintain a constant voltage in normal time. "CASE 2. When load suddenly increases" immediately after the load (LD) 12 connected to the branch distribution line 6 between the second and third voltage regulators VR2 and VR3 suddenly increases, each voltage regulator (VR) 5 is still in operation. This shows the state of the line voltage before the voltage adjustment operation is started. “CASE 3. At the time of individual compensation operation” means that the line voltage immediately after the completion of the individual voltage regulators (VR) 5 simultaneously performing the secondary voltage rise adjustments simultaneously without the monitoring and control means (RC) 9 operating. This is the situation encountered in the prior art. "C
ASE4. At the time of the supervisory control operation, the supervisory control system of the voltage regulator according to the present invention is operated, the secondary voltage rise regulation is performed only in the first voltage regulator VR1, and the other voltage regulators VR2 and VR3 perform supervisory control commands. 7 shows the line voltage state immediately after the completion of the adjusting operation of the first voltage adjusting device VR1 when the voltage adjusting operation is temporarily suspended based on the temporary waiting instruction of the second case and the third case. The secondary voltages of the voltage regulators VR2 and VR3 deviate from the reference voltage set value, and a second voltage regulation operation is required, as shown in FIG. 5) shows the time change of the secondary voltage of 5. The first voltage regulator VR1 performs one operation of the second voltage regulator VR1.
This indicates that the second voltage regulator VR2 has to perform the secondary voltage regulation operation twice, and the third voltage regulator VR3 has to perform the secondary voltage regulation operation three times. In the case of CASE4, the first
Of the second voltage regulator V1 is once.
R2 is one time shifted with respect to the first voltage regulator VR1, and the third voltage regulator VR3 is zero times two.
Next voltage adjustment work is required.

The control operation of the monitoring control system of the voltage regulator for realizing "CASE 4. State at the time of monitoring control operation" will be described. Referring to FIGS. 1 and 2, 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 transformer (TRF) 7 into a transformer 13 for an instrument. , 14 and converted into digital data by an A / D converter 15 to control a voltage regulator controller (VRC).
17 and a monitoring command control unit (CTR) 20 in the monitoring control means (RC) 9. Voltage regulator control unit (VR
C) 17 is a preset reference voltage setting device (VS)
R) 16 compares the reference voltage value with the digital data received from the A / D converter 15 and determines a predetermined allowable error (a deviation from the reference voltage set value for judging that it is equal to the reference voltage set value). In the case of deviating from the range of (limit value of), after a necessary time delay (usually several ms) corresponding to the communication time of the monitoring and control means (RC) 9, the tap switch (TCR)
19, a tap switching command is issued. The tap switch (TCR) 19 immediately executes the tap switching operation of the transformer (TRF) 7, but during the tap switching operation, the next tap switching command is protected from reaching. Monitoring and control means (RC)
The monitoring command control unit (CTR) 20 edits the device status monitoring information in accordance with the transmission timing of the device status monitoring information of the own device, and transfers it to the transmitter (TMR) 21. Transmitter (T
The MR 21 sends a signal to the remote monitoring center device (RM) 11. The remote monitoring center device (RM) 11 receives the information of all the voltage adjustment devices (VR) 5 and performs an arithmetic process, and the voltage adjustment device (VR) 5 that needs a temporary waiting process for the voltage adjustment work. The temporary waiting command is transmitted with an address. The receiver (RVR) 22 of the voltage regulator (VR) 5 having received the provisional waiting instruction with the address specified transmits the provisional waiting instruction signal to the monitoring command control unit (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) The switch 18 existing between the switch 17 and the tap changer (TCR) 19 is turned off for a predetermined time, and the voltage adjustment controller (VRC) 17 outputs the tap change signal to the tap changer (TC).
R) block transmission to 19;

As described above, the operation of the monitoring and control system of the voltage regulator is controlled by the voltage regulator (VR) 5 remote from the power supply, that is, the second,
Although the case has been described in which the third voltage regulators VR2 and VR3 execute only the temporary stop processing, the case of "CASE4.
As can be seen with reference to "At the time of monitoring control operation", the temporary and temporary matching processes alone cause the second and third voltage regulators VR1 and VR2 to operate in two stages, which is not desirable from the viewpoint of power quality. In order to solve this problem, the monitoring command control unit (CTR) 20 receives the voltage information together with the temporary waiting command, determines the residual voltage deviation by calculation, and issues a tap switching command for adjusting the corresponding value to the voltage. The signal is directly transmitted to the tap changer (TCR) 19 of the adjustment control means (VC) 8. Thereby, the single tap change operation of the plurality of voltage adjusters (VR) 5 at the same time causes the tap change operation of FIG.
ASE1. It is possible to recover the “normal state”.

FIG. 5 shows the processing flow of the monitoring command control unit (CTR) 20, and FIG. 6 shows the processing flow of the remote monitoring center device (RM) 11. The monitoring command control unit (CTR) 20 of the monitoring control unit (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 set value, the allowable error set value, the switch 18
ON / OFF state, tap switching method (automatic or manual?), Tap switching operation state (tap switching operation?),
Then, the data of the tap position is collected, the report data is edited by adding the transmission device address, and transmitted to the transmitter (TMR) 21. In the case of the temporary waiting instruction, the apparatus status report data of the voltage regulator (VR) 5 which is only one power supply side from the own apparatus at the time when the instruction is issued and the apparatus status report data at the time immediately before the instruction are used. Then, at the present time, it is necessary to issue a tap switching command, and if necessary, to which tap position to switch, it is calculated by an arithmetic process, the switch 18 is turned off to temporarily suspend the operation, the timer is started, and the tap is started. It outputs the switching instruction and waits for a predetermined time to elapse. After a lapse of a predetermined time, the switch 18 is turned on to end the temporary stop state, the timer is reset, the report data of the end of the temporary waiting process is edited, and transmitted to the transmitter (TMR) 21. In the case of a setting change command, an instruction to turn off the switch 18 is issued to prevent erroneous processing from occurring during the setting value change processing, 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. Modify based on the change order. When the setting value change processing is completed, an ON instruction of the switch 18 is issued, and the report data of the completion of the setting value change processing is edited and transmitted to the transmitter (TMR) 21. If there is neither the temporary waiting command nor the setting change command, only the data of the immediately preceding power supply 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, it periodically issues a device state monitoring command to report the current state of each device. In each device in this case, a pole switch (DM) 4
May be included. When at least all the information from each voltage regulator (VR) 5 has been collected, arithmetic processing is performed to determine whether a temporary waiting command is required and whether a setting change command is required. When the temporary waiting command is required, the voltage regulator (VR) 5 in which the voltage drop has occurred is determined as a temporary waiting command transmission target device except for one voltage regulator (VR) closest to the power supply, and the temporary waiting command is set. Send a term command. If the setting value change processing is required, a setting change command is issued, and the process returns to the apparatus state monitoring processing in the next cycle.

The operation described with reference to FIGS.
By way of example only, there may be many variations within the principles and scope of the present invention. For example, a remote monitoring center device (R
M) The device status monitoring report is described based on the monitoring control command of 11), but it is also possible for each device to automatically transmit 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 command is required. The normally open point of the pole switch (DM) is set to, for example, the fourth pole switch (DM).
4) In the case of moving from 4 to the third pole switch (DM3) 4, the power supply direction of the third voltage regulator (VR3) 5 changes from left to right. The operation of the upper switch (DM) 4 automatically reports to the remote monitoring center device (RM) 11 and reports it to each voltage regulator (VR).
A method of automatically contacting 5 (this automatic contact may be unnecessary) is also possible. Alternatively, the result of the status change of the pole switch (DM) 4 is transmitted to the remote monitoring center device (R
M) 11 and each voltage regulator (VR) 5 may be manually input. In addition, switch 18
However, a method of temporarily changing the allowable error set value to a large value or a method of temporarily switching the tap switching method to manual is also possible. To be more specific, the types of collected data and set values are not limited to those listed here, and it is not necessary to process all the listed items. Various variations may exist even in the processing steps.

By taking such a measure, unnecessary voltage adjustment operation of the voltage regulator (VR) 5 is suppressed, and stable voltage management of the distribution system becomes possible, and unnecessary increase in the number of operations is prevented. As a result, a longer life of the voltage regulator and an improvement in power quality can be achieved by preventing deterioration of the voltage regulator due to an increase in the number of operations.

Next, a second embodiment will be described with reference to FIG. As can be seen from comparison with FIG. 1, the remote monitoring center device (RM) is simply omitted in appearance. Therefore, each voltage regulator (VR) 5 is connected to the remote monitoring center device (R).
It is necessary to share the function of M) with the entire voltage regulator (VR) 5. The voltage regulator (V
Although the configuration diagram of R) 5 is the same as shown in the drawing, a difference occurs in the processing content of the monitoring command control unit (CTR) 20. FIG. 8 shows the processing flow. Basically, the processing function of the remote monitoring center device (RM) in the monitoring and control system of the voltage adjusting device including the remote monitoring center device (RM) and the monitoring command control unit (CTR) 20 of the voltage adjusting control means (RC) 9 The processing function of the monitoring command control unit (CTR) 20 has a combination of both processing functions, that is, the function of the processing flow of FIGS. 6 and 5. Instead of transmitting the device status monitoring command of the remote monitoring center device (RM), the monitoring command control unit (CTR) 20 voluntarily adjusts the device status monitoring data (power supply direction, Primary and secondary voltages, reference voltage set values, allowable error set values, switch states, tap switching methods, switching operation states, and tap positions) are collected and arithmetic processing is performed. Then, it is determined whether or not it is necessary to transmit a temporary waiting command, and transmission data to the voltage regulator (VR) 5 located farther from the power supply than the own device, that is, monitoring data of the own device, 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 where the temporary waiting command is received, the case in which the setting change command is received, and the case in which only the monitoring data is received are the same as those in FIG. However, the address of the transmission data of the completion of the processing is not the remote monitoring center device (RM) but the voltage regulator (VR) 5 arranged on the power supply side up to the voltage regulator (VR) 5 that issued the command. The above description of the operation is merely an example, and there are various variations within the principle and scope of the present invention, and the effects thereof are described in the monitoring control system of the voltage regulator provided with the remote monitoring center device (RM). Is the same as

[0016]

According to the present invention , a voltage regulator close to a power supply is provided.
Voltage adjustment devices
Since you to operate the unnecessary voltage adjustment operation is suppressed enables stable voltage management of the distribution system,
A longer life of the voltage regulator and an improvement in power quality are achieved.

[Brief description of the 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 distribution line voltage when a load suddenly changes in a distribution system in which voltage regulators are arranged in series.

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

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

FIG. 6 is a processing flowchart of the remote monitoring center device.

FIG. 7 is a configuration diagram of a power distribution system to which the present invention without a remote monitoring center device is applied.

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

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 power supply transformer (TR) 3 distribution line 5 voltage regulator (VR) 7 transformer (TRF) 8 voltage regulation controller (VC) 9 supervisory controller (RC) 10 communication circuit 11 remote monitoring center device (RM) 13 Primary-side instrument transformer 14 Secondary-side instrument transformer 17 Voltage regulator controller (VRC) 19 Tap switcher (TCR) 20 Monitoring command controller (CTR) 21 Transmitter (TMR) 22 Receiver (RVR) )

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Mitsuru Nakamura 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture Kokubu Plant, Hitachi, Ltd. (56) References JP-A-4-275026 (JP, A) JP-A-3-105407 (JP, A) JP-A-1-99435 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02J 3/00-5/00 H02J 13/00 -13/00 311

Claims (1)

(57) [Claims] 1. A plurality of power supply units, each of which is distributed in a distribution line connected to a power supply and is configured to transform a voltage of the distribution line by a transformer.
A voltage regulator, wherein the plurality of voltage regulators regulate an output voltage of the transformer.
Via a communication circuit with other devices.
Connected based on information from the communication circuit.
Monitoring control means for outputting to the voltage adjustment control means.
And the monitoring control means of each of the voltage regulators is connected to the power supply.
Those belonging to the closer voltage regulators have priority
A monitoring and control system for a voltage adjusting device, which outputs a command for adjusting a voltage in a timely manner.