JP4948432B2 - Voltage regulation system - Google Patents

Description

  In the power system, when voltage fluctuations occur in the upper power generation / substation, etc., the tap of the voltage adjustment circuit provided in the lower substation is moved up and down in advance to suppress the increase in the number of tap operations, and the electrical quality It relates to technology to improve.

  In the power system, the target voltage value is switched at a predetermined time in order to make the target voltage different between the peak time and the off-peak time (FIG. 20).

  Conventionally, the program controller (10T) is combined with the voltage adjustment relay (90Ry), the target voltage is changed according to the pattern set in the program controller (10T), and the target voltage is set within the dead zone of the voltage adjustment relay. The voltage was adjusted appropriately on the condition of operation time.

  However, in the voltage adjustment by the combination of the voltage adjustment relay (90Ry) and the program controller (10T), the voltage adjustment relay (90Ry) cannot be adjusted quickly when the voltage rises or falls due to the operation time limit of the voltage adjustment relay (90Ry). There has been a problem that useless tap switching is performed at a substation or the like.

  For this reason, there has been proposed a voltage regulator technology that reduces the fluctuation of the secondary side voltage in the lower substation and reduces the number of tap switching by correcting the operation judgment level of the voltage regulation relay using fuzzy inference. Yes. (For example, see Patent Document 1).

  In addition, when phase-adjusting equipment such as a shunt reactor (ShR), capacitor (SC), etc. is turned on / off by the program method, the voltage fluctuates and deviates from the dead zone of the voltage regulating relay (90Ry), and the voltage value is dead zone There is also a problem that it takes a long time to make adjustments.

For this reason, before the phase adjustment operation of the phase adjustment equipment, the bus voltage after the phase adjustment operation is predicted by the voltage adjustment relay, and when the prediction result deviates from the dead zone, the voltage is adjusted within the dead zone by tap switching. Techniques relating to a voltage adjustment method in a substation that outputs a compatible signal have been proposed. (For example, see Patent Document 2).
Japanese Patent Application Laid-Open No. 11-231949 JP-A-9-28037

  As described above, in the voltage adjustment by the combination of the voltage adjustment relay (90Ry) and the program controller (10T), due to the operation time limit of the voltage adjustment relay (90Ry), quick voltage adjustment at the time of rising or falling of the voltage cannot be performed. There has been a problem that useless tap switching is performed in subordinate substations and the like.

  In addition, when the capacitor (SC) and the shunt reactor (ShR) are turned on / off, there is a problem that the electrical quality may be deteriorated by deviating significantly from the target voltage.

  Furthermore, it is possible to improve the electrical quality by reducing the dead zone and shortening the operation time, but in this case, the number of tap operations increases and the life of the load tap changer is shortened. there were.

  The present invention has been made in view of such circumstances, and by reducing the dead zone and the operating time, which are the operating elements of the voltage regulating relay (90Ry), to the time zone required for device control, the number of tap operations can be reduced. An object of the present invention is to provide a voltage regulation system capable of performing quick voltage control without increasing the number.

  The voltage regulation system of the present invention is a voltage regulation system that regulates the system voltage using a voltage regulation circuit connected by communication means, and the voltage fluctuation by the communication means when controlling the voltage fluctuation at the power generation / substation. The voltage fluctuation information acquisition means for acquiring the control information of the voltage and the voltage adjustment circuit of the substation located below the power generation / substation that acquired the control information of the voltage fluctuation are provided with a shortening signal for shortening the operation time of the tap in advance. An operation time shortened by the shortening signal is set to be shorter than a time when voltage fluctuation control is completed at the power generation / substation located at the upper position and located at the lower order. After the completion of the control for changing the tap of the substation, the control of the voltage fluctuation is completed at the power generation / substation located at the upper level.

Specifically, a wide-area voltage control time changing device or the like is provided in the power system to adjust the system voltage.
Here, the “communication means” includes a remote monitoring control device (TC) via a dedicated communication line, and a transmission device via a general-purpose communication network such as the Internet. “Voltage adjustment circuit” means a circuit for adjusting voltage in a voltage regulator, a voltage regulation relay, or the like. “Voltage fluctuation information” means control information for generating voltage fluctuations at a power generation / substation obtained by communication means using, for example, a remote monitoring control device (TC). Further, the “shortening signal” means a control signal that shortens the tap operation time of the voltage adjustment circuit that originally requires a predetermined time. The “shortening signal” includes a signal that shortens the raising operation time and a signal that shortens the lowering operation time.

  “Substation located under the power generation / substation” means a substation located on the secondary side of the power generation / substation used as the standard in the power system, and refers to the monitoring control system, etc. provided in the control station, etc. By doing so, extraction becomes possible.

  According to the present invention, when there is a voltage fluctuation in the upper power generation / substation, the tap of the lower power substation can be quickly changed. However, there is an effect that the deviation of the allowable value does not occur due to the delay of the tap operation time in the lower substation.

  Further, in the voltage regulation system of the present invention, the shortened signal transmitted by the shortened signal transmission means includes a signal for changing a dead band range of the voltage regulation circuit, and is a substation located below the generating / substation. And a voltage determination means for determining whether or not the voltage of the voltage adjustment circuit in the range of the dead zone changed by the shortening signal.

  Here, “changing the dead band range of the voltage adjustment circuit” means performing control so that the tap moves quickly by, for example, reducing a predetermined dead band or shifting it up and down. .

  Advantageous Effects of Invention According to the present invention, there is an effect that voltage control can be quickly performed without increasing the number of tap operations by moving in advance a tap that operates due to voltage fluctuations in a higher power generation / substation.

  Furthermore, the voltage regulation system of the present invention comprises device operation information acquisition means for acquiring device operation information by communication means when there is operation of a device that generates voltage fluctuation at the power generation / substation. The voltage fluctuation information at the substation includes the device operation information.

  According to the present invention, in the upper substation / substation, even in the lower substation, the voltage variation generated when there is an operation of turning on / off the phase adjusting equipment not intended for the voltage variation itself. Since the tap can be changed quickly, the number of tap operations can be reduced.

  In the voltage regulation system of the present invention, the voltage fluctuation information at the higher power generation / substation includes control information for changing a target voltage according to time.

  Here, the “target voltage” of the power system is changed to a predetermined time even in one day, for example, and the arrival of time in the day is monitored and controlled by a program controller or the like. When the information on the change of the target voltage is acquired by the voltage fluctuation information acquisition unit, the shortening signal is transmitted by the shortening signal transmission unit, and the dead zone and the operation time of the tap are changed.

  According to the present invention, there is an effect of enabling safe voltage control in changing the target voltage that is performed when the time comes.

  Furthermore, in the voltage regulation system of the present invention, the device operation information includes a signal for turning on / off a phase adjusting facility including a capacitor and a shunt reactor.

  The voltage adjustment method of the present invention is a voltage adjustment method for adjusting a system voltage by using a voltage adjustment circuit, and the voltage at a substation located at a lower position in controlling voltage fluctuation at a higher power generation / substation. The operation time of the adjustment circuit is shortened to a time shorter than the time when the voltage fluctuation control is completed at the power generation / substation located at the upper level, and the dead zone range of the voltage adjustment circuit is changed, and Determining whether or not the voltage of the voltage adjustment circuit in the substation located at a lower position of the substation is within the range of the changed dead band, and when determining that the voltage is not within the changed dead band range, Completing the step of performing control to change the tap of the voltage adjustment circuit in the substation located below the power generation / substation and the control to change the tap in the substation located in the subordinate In, characterized in that it comprises the steps to complete the control voltage variation in originating-substations higher, the.

  According to the present invention, the system voltage is monitored by a wide-area voltage control time change device or the like, and the system voltage collapse is avoided by controlling the lower system voltage with priority given to the upper system in response to a rapid system voltage drop. There is an effect that can be.

  According to the voltage regulation system of the present invention, it is possible to increase the voltage quality without increasing the number of tap operations by reducing the dead zone of the voltage regulation relay (90Ry) and shortening the tap operation time.

  Further, the voltage fluctuates due to the operation of the phase adjusting equipment, and a large voltage deviation in the voltage adjusting relay (90Ry) can be avoided.

  In addition, by quickly optimizing the system voltage, the impact of the lower system is minimized by a quick tap change to the interconnection transformer for pump operation of the pumped storage power plant and voltage fluctuations of the upper system such as capacitors and shunt reactors. Therefore, the number of tap operations at various places can be reduced.

  As a result, the load on the on-load tap changer for which the number of lifetimes has been determined in advance is reduced, so that the inspection cycle and life of the on-load tap changer can be extended.

  The voltage regulation system of the present invention enables wide-area voltage control without requiring complicated calculation even in a distributed voltage control system. In other words, the voltage regulation system of the present invention can be easily introduced simply by incorporating software into a computer of the current system and modifying some of the devices. As a result, it is possible to carry out voltage management with good quality while being inexpensive, so that the economic merit is also great.

  Furthermore, since the current 90Ry is utilized, control within the set electrotechnical standard is possible, so that it is possible to avoid overcontrol without requiring special treatment.

  Hereinafter, a first embodiment according to the voltage regulation system 1 of the present invention will be described. FIG. 1 is a diagram showing an outline of the present embodiment.

  A substation A51 that performs voltage adjustment and the like of the distribution line 6 in the power system includes an operation mechanism unit 515, a voltage adjustment relay 511, a program controller (10T) 510, a one-shot circuit 512, and the like. The wide-area voltage control time changing device 82 of the control station controls the operation of the on-load tap changer (LR) 516 of the substation A51 and the like from the control station MP81 (not shown) via the remote monitoring control device (TC) A31.

  Specifically, the substation A51 measures the voltage on the primary side with the voltage adjustment relay 511, and adjusts to the appropriate voltage by changing the tap of the transformer based on the dead band and operation time set in advance. To send.

  Here, the voltage adjustment is performed based on a predetermined target voltage. The value of the target voltage varies depending on the peak time and the off-peak time (FIG. 20), and these target voltage values are changed by the program controller (10T) 510. It is controlled in the normal mode (M).

  In the present embodiment, the one-shot circuit 512 is transmitted by transmitting a shortening signal from the wide-area voltage control time changing device 82 via the remote monitoring control device (TC) A31 or the like in the tap change operation that requires 60 seconds in the normal mode. Performs the control to change the tap change operation to 1 second (shortening mode), and also reduces the band of the dead zone by the shortening signal (shortening signal transmitting means 125).

  Specifically, when the tap change is performed by changing the target voltage value or the like in the upper system substation, the normal mode (M ) Tap control is performed. However, in the wide-area voltage control time change device 82 that monitors the system voltage, if it is determined that it is necessary to avoid collapse due to a rapid system voltage fluctuation, the remote voltage control time device (TC) or the like is used in advance. By transmitting a shortening signal to the one-shot circuit of the substation substation, the tap change is controlled before voltage fluctuation occurs. Thereby, it is possible to avoid the collapse of the system voltage with respect to the voltage fluctuation in the upper system substation.

This is because when the Tr tap is lowered in the generator system, the voltage on the high voltage side is not lowered, but the voltage on the high voltage side is increased, and the load is reduced due to the voltage drop.
There are two types of shortening control modes: a mode (H-1) for controlling the time for the tap raising operation to 1 second and a mode (L-1) for controlling the time for the tap lowering operation to 1 second. is there.

  The tap change operation usually takes 60 seconds for the purpose of eliminating unnecessary control by measuring the system voltage in a stable state. In this embodiment, the shortening signal is used under predetermined conditions. To shorten the tap change operation time to 1 second.

  Furthermore, the wide-area voltage control time changing device 82 of the control station is controlled when turning on / off or the like in the phase adjusting equipment such as the shunt reactor (ShR) 513 and the capacitor (SC) 514 attached to the substation A51. Control information (event signal) of the phase adjusting equipment is received via the remote monitoring control device (TC) A31 (equipment operation information acquisition means 124), and the one-shot circuit 512 similarly transmits a shortening signal to the voltage adjustment relay 511. (Shortening signal transmission means 125), tap change shortening control is performed.

  In FIG. 1, the local program controller (10T) 510 or the like controls the voltage adjustment relay 512, and the wide-area voltage control time changing device 82 at the control station passes through the remote monitoring control device (TC) A31 or the like. , The one-shot circuit 512 is controlled. However, depending on the setting, the wide-area voltage control time changing device 82 of the control station controls the one-shot circuit 512 via the remote monitoring control device (TC) A31 for all controls. It can also be set to control.

FIG. 2 is a graph showing the fluctuation of the voltage value when the target voltage is changed.
In the conventional system shown in the A part of the figure, when the target voltage is changed by the program controller (10T) 510, the operation time of the voltage adjusting relays 521, 531 and the like is reduced in the substations B52 and C53. Since there are 60 seconds, a control delay always occurs, and a delay occurs between the actual voltage value. Therefore, there is a risk of voltage error in the voltage adjusting relays 521, 531 and the like.

  On the other hand, in the voltage regulation system 1 of the present embodiment shown in the B part, the operation time of the voltage regulation relay 511 is transmitted by transmitting a shortened signal (2 seconds) by the one-shot circuits 522, 532, etc. (shortened signal transmission means 125). Can be reduced from 60 seconds to 1 second. This eliminates the delay in control and eliminates the difference between the target voltage value and the actual result, and therefore it is possible to avoid voltage errors in the voltage adjustment relays 521, 531 and the like.

  FIG. 3 is a graph showing a change in voltage value in the lower substation when the phase adjusting equipment in the upper power generation / substation is turned on / off.

  In the conventional system shown in the A part of the figure, when the capacitor (SC) 514 is turned on, the voltage immediately rises at the lower substation and a voltage error occurs. However, in the voltage regulation system 1 of the present embodiment shown in the B section, a reduction shortening signal is transmitted by the one-shot circuits 522, 532, etc., which will be described later, before the capacitor (SC) 514 is turned on, so that it is out of the reduced dead zone. Since the tap is lowered and fluctuated in advance (the shortened signal transmission means 125 and the voltage determination means 126), even if the capacitor (SC) 514 is turned on, no upper limit voltage error occurs.

  That is, by reducing the dead zone, it is possible to control the tap that originally moves after the capacitor (SC) 514 is moved so as to move quickly.

  As a result, when the phase adjusting equipment is turned on / off, a shortening signal is sent so that the voltage before turning on / off is within the proper state after turning on, and the correct voltage (even if the phase adjusting equipment is turned on / off) is forcibly transmitted. By setting the voltage so that there is no problem, it is possible to perform control that does not deviate from the allowable value even if the phase adjusting equipment is turned on / off.

  In the example of FIG. 3, the dead zone is changed from 1.5% to 1.0%, and the operation time is changed from 60 seconds to 1 second. The shortened signal is about 10 seconds, the tap fluctuation range is from 60V to 140V which is the dead zone, and the voltage fluctuation due to the insertion of the capacitor (SC) 514 is 50V.

  Moreover, in the one-shot circuits 522, 532, etc., a shortened control pattern by an event is previously incorporated in the field in advance, and shortening signal control is performed only by selecting signals from the remote monitoring control devices (TC) B32, C33, etc. Control can be possible.

  FIG. 4 is a diagram illustrating a configuration example of the system when the voltage regulation system 1 of the present embodiment is incorporated in the power system. In this embodiment, the voltage quality can be increased without increasing the number of taps.

  In this example, the control station MP81, which is a control station, receives event signals from remote monitoring and control devices (TC) A31, B32, C33 and the like attached to the substations A51, B52, C53, etc. of the system, and performs wide-area voltage control. It is transmitted to the time change device 82. Further, the control station MP81 sends a shortening signal to each electric station based on the signal from the wide-area voltage control time changing device 82.

  Here, the event signals from the remote monitoring and control devices (TC) A31, B32, C33 and the like are specifically the ON / OFF signal of the shunt reactor (ShR) 513 in the substation A51, and the voltage adjustment relay 511 in the substation A51. Tap operation, pumping at the power station A71, etc., phase advance / medium / low power, breaker (CB) of upper system accident, on / off signal of customer SC (capacitor) / electric furnace breaker (CB), etc. Means.

  In response to information such as fluctuations in the system voltage from the MP 81, etc. of the control station (voltage fluctuation information acquisition means 123) and event signals from the remote monitoring control devices (TC) A31, B32, C33, etc. (apparatus operation information acquisition means) 124), the wide-area voltage control time changing device 82 transmits a shortened signal to the one-shot circuit (shortened signal transmitting means 125) via the remote monitoring control device (TC) that monitors and controls the corresponding voltage, and the voltage adjusting relay Control of shortening.

  Here, the one-shot circuit means a circuit that outputs only the time until the event is completed, such as the LR tap switching time, the pumping output fluctuation, and the phase advance change time with respect to the state change.

  Note that the one-shot circuits 512, 522, 532, and the like incorporate a shortening control pattern by an event in advance, and in this embodiment, the dead zone is raised by 1.0% in the raising operation (H-1) in the shortening mode. The time until the operation is 1 second. In the lowering operation in the shortening mode, the dead zone is 1.0%, and the time until the lowering operation is 1 second.

  Further, in this example, the voltage adjustment circuit provided in the voltage adjustment relay (90Ry) 511, 521, 531 and the like is the reference voltage 110 kV (6.60 kV), and in the normal mode (M), the dead band is 1.5% and the vertical operation is performed. The time to do is about 60 seconds.

FIG. 5 is a diagram showing a basic configuration of the example shown in the above-described system configuration diagram.
The control station MP81 receives information such as voltage control of each electric station from the wide-area voltage control time changing device 82 as a shortened signal.

  Further, the wide-area voltage control time changing device 82 receives an event signal acquired from a device for which each remote monitoring control device (TC) A31, B32, C33, etc. performs monitoring control via the control station MP81. The received event signal targets only the system electrical station that is considered to have voltage fluctuations, and sends out the shortened signal sequentially from the host system via each remote monitoring control device (TC). These shortening signals are performed only by a selection signal to enable quick control.

  It should be noted that the selection of the subordinate system electrical stations that are considered to have voltage fluctuations, the order of sending shortened signals, and the like can be made by referring to, for example, a monitoring control system provided in the control station or the like.

  Each remote monitoring control device (TC) that has received the shortening signal from the wide-area voltage control time changing device 82 via the control station MP81 sends a signal to the one-shot circuit to control the voltage adjustment circuit. The voltage adjustment circuit is switched in two stages, and taps up quickly or taps down quickly in the shortening mode (HL).

  These controls can also be realized by computer software provided in the wide-area voltage control time changing device 82 or the control station MP81.

  FIG. 6 is a functional block diagram of the voltage regulation system 1 of the present embodiment. In this example, the remote monitoring control device (TC) is controlled by the function of the wide-area voltage control time changing device 82. However, as described above, it can also be realized by a computer provided in the control station MP81.

  The voltage adjustment system 1 of the present embodiment includes a remote monitoring control device (connected to a wide-area voltage control time changing device 82 that performs voltage adjustment of a power system by a preset program via a communication network 2 via a control station MP81 ( TC) A 31, B 32, C 33, remote monitoring and control device (TC) A 31, etc. are configured by substations A 51, B 52, C 53, distribution lines 6, etc. that perform monitoring control via the control cable 4.

  The wide-area voltage control time changing device 82 constituting the voltage adjustment system 1 includes a transmission / reception unit 11 connected to the communication network 2, an arithmetic processing unit 12 that performs arithmetic processing related to voltage adjustment, and a storage unit that holds data necessary for voltage adjustment 13, an input unit 14 such as a keyboard for inputting data, and an output unit 15 such as a display device or a printer for outputting data.

  The transmission / reception unit 11 of the wide-area voltage control time changing device 82 of the present embodiment is connected to the remote monitoring control devices (TC) A31, B32, C33, etc. via the communication line 2 via the control station MP81.

  The central processing unit 12 is a transmission / reception processing unit 121 that exchanges data with the transmission / reception unit 11, an input / output processing unit 122 that exchanges data with the input unit 14 or the output unit 15, and voltage fluctuations at the power generation / substation. Voltage change information acquisition means 123 for acquiring the information of the device, device operation information acquisition means 124 for acquiring the operation information of the device that the remote monitoring control device (TC) A31 or the like performs monitoring control, and change of the operation time is required when changing the tap In such a case, a shortened signal transmitting unit 125 that transmits a shortened signal, a voltage determining unit 126 that determines a tap voltage based on the changed dead band, and determines whether the voltage after the tap change is appropriate, or the like.

  The storage unit 13 of the wide-area voltage control time changing device 82 includes a fluctuation program table 131 that stores program information that defines system voltage fluctuations, an event table 132 that specifies events that have occurred in the phase-adjusting devices at the power generation / substation, The management table 133 is configured.

  The fluctuation program table 131 holds the time and value of the change of the system target voltage, information on voltage fluctuations and reactive power fluctuations that occur periodically, and the like (FIG. 7). The voltage adjustment system 1 according to the present embodiment monitors the voltage fluctuation based on the change time and value of the system target voltage defined in the fluctuation program table 131 of the wide-area voltage control time changing device 82, and makes a rapid system voltage change. System voltage collapse is avoided by controlling the system voltage with priority given to higher systems against fluctuations. For example, when the upper system voltage is low, a shortening signal is sent to lower the lower system voltage and the tap lowering control is performed, so that the upper system voltage is raised, so that the system voltage collapse can be avoided. In addition, regarding voltage fluctuations that occur periodically, the occurrence of a voltage error can be avoided by sending a shortening signal so that a quick tap operation can be performed corresponding to a time expected in advance.

  Specifically, information such as the target voltage change time, target voltage value, trunk reactive power value, fluctuation range, etc., which vary from system to system, is retained, and based on the corresponding signal pattern when the specified time arrives. To send a shortened signal.

  Further, a procedure for transmitting a shortened signal is also defined. In the example of FIG. 7, when the system voltage fluctuates rapidly or deviates from the target, a shortening (up / down) signal is sent to each LR, and the shortening signal is transmitted in order from the host system to To cope with the fluctuations of In addition, when the system voltage is not recovered even by such control, collapse of the system voltage is avoided by sequentially sending a shortening reduction signal to the lower transformer (LR).

  In the event table 132, when there is a tap operation in a voltage regulating relay of a power generation / substation, or a switching / opening operation of a phase adjusting equipment such as a shunt reactor (ShR) or a capacitor (SC), a remote monitoring control device (TC ) For the event signal received from A31 or the like, a control code or the like indicating a shortened signal to be transmitted to a substation or the like is defined (FIG. 8).

  Specifically, for each received event signal, a control code and a time during which transmission is continued are defined, and a shortened signal is transmitted based on the corresponding signal pattern.

  In the example of FIG. 8, for example, when an event signal “XX substation SC input” is received, the “△ ΔTr decrease shortening signal” which is the control content of the corresponding control code “L-2-1”. For 10 seconds. The procedure stipulates that shortened signals are sent in order from the host system.

  Note that the shortening signal is continued for 10 seconds because it takes a certain time to turn on the capacitor (SC) at the substation, so that the tap change at the lower substation can be performed safely during that time. It is to make it. In such a case, different tap change controls are not accepted.

  The management table 133 manages the history of the event signal received from the remote monitoring control device (TC) A31 and the like, and transmits it to the subordinate substation in response to the reception of the event signal, the arrival of the target voltage change time, etc. The history of the shortened signal is managed (FIG. 9).

  Furthermore, the management table 133 also manages the result of the shortening control performed by transmitting the shortening signal to the subordinate substation. Specifically, after the shortening signal transmission unit 125 transmits the shortening signal to the remote monitoring control device (TC) A31 or the like, the voltage determination unit 126 executes the remote monitoring control device (TC) A31 that has been subjected to the shortening control. Monitor voltage fluctuations at etc. As a result of monitoring, when an event or the like is completed without causing an upper / lower limit error by shortening control, “normal” is output in the result column. On the other hand, when an upper / lower limit error occurs, “uncontrollable” is output in the result column.

  In addition, the voltage determination means 126 of this embodiment can also be set to transmit a shortened signal again to the corresponding voltage adjustment relay A511 etc. in response to the output of “uncontrollable” (shortened signal transmitting means) 125).

  Next, the configuration of the substation A51 and the like in which the remote monitoring control device (TC) A31 and the like perform monitoring and control via the control cable 4 will be described.

  The substation A51 is located on the primary side of the distribution line 6 constituting the power system, and is a voltage adjustment relay 511 that performs voltage adjustment, and a one-shot circuit that shortens the operation time of tap change in the voltage adjustment relay 511 and reduces the dead zone. 512, and a program controller (10T) 510 for changing the target voltage of the voltage adjusting relay 511 according to the time zone.

  Also, for the substations B52 and C53 located on the secondary side of the substation A51, the voltage adjustment relays 521 and 531 for performing voltage adjustment, and the one-shot circuits 522 and 532 for shortening the operation time for changing taps and reducing the dead zone. And a program controller (10T) 520, 530, etc. for changing the target voltage of the voltage adjusting relays 521, 531 according to the time zone.

  FIG. 10 is a diagram showing the transition of voltage control when the entrance operation of the shunt reactor (ShR) 513 is performed in the conventional system.

  First, when the operation for entering the shunt reactor (ShR) 513 is performed, a voltage drop occurs in the substations A51, B52, C53 and the like. In the substation C53, since the voltage is shifted when the voltage is low, tap raising control is performed. Thereafter, since the voltage is low at the substation A51, the tap raising control is performed, and the voltage is also raised at the subordinate substations B52 and C53 by the tap-up of the previous term. Thereby, voltage fluctuation becomes large in the substation C53.

On the other hand, FIG. 11 shows a flow when the shortening control according to the present embodiment is performed.
Specifically, before the operation of entering the shunt reactor (ShR) 513, a shortening signal is transmitted to the voltage adjustment circuit of each substation (shortening signal transmission means 125). As a result, the voltage at the substation C53 is lower than the reduced dead zone, so that the tap raising operation is performed in advance. The increased voltage is confirmed and recorded by the voltage determination means 126.

  After that, the voltage drops due to the operation of turning on the shunt reactor (ShR) 513, and the tap lowering control is performed at the substation A53. However, since the tap raising operation is performed in advance at the substation C53, the voltage error Generation | occurrence | production can be avoided and the fluctuation | variation of a voltage can be made small. If a voltage error is detected by the voltage determination means 126 at this time, it is output as uncontrollable.

  In the example of FIG. 11, even after the operation of turning on the shunt reactor (ShR) 513, a shortened signal is transmitted to the voltage adjustment circuit of each substation, and a voltage upper and lower limit error has occurred. If you are going to adjust the voltage quickly. Details will be described in a second embodiment described later.

[Basic voltage control with higher priority]
FIG. 12 illustrates a basic operation of the voltage reduction control with priority given to the upper system in the present embodiment.
In this embodiment, voltage fluctuations are monitored based on the time and value of the change of the system target voltage defined in the fluctuation program table 131, and the system voltage control is performed by giving priority to the upper system of the fluctuation part for sudden system voltage fluctuations. (S303). The voltage determination means 126 monitors the normal value of the voltage subjected to the shortening control with higher system priority. As a result of monitoring, when the event or the like is completed without causing an upper / lower limit error due to the shortening control (“YES” in S304), “normal” is output in the result column (S305). On the other hand, if an upper / lower limit error occurs (“NO” in S304), “Uncontrollable” is output in the result column, and if the system voltage does not recover (S306), the lower transformer (LR) is output. On the other hand, the collapse of the system voltage is avoided by sending a shortening reduction signal (S307).

[Predictive control for tap operation in system voltage fluctuation]
FIG. 13 illustrates the operation when the tap up / down operation due to the system voltage fluctuation is performed in the upper system substation A51.

  When a tap raising operation is performed at the upper-level substation A51, the voltage instantaneously increases at the lower-level substations B52, C53, and the like. Therefore, a voltage error can be avoided by performing a tap lowering operation in advance when necessary in preparation for an instantaneous voltage increase.

  In this embodiment, based on the time and value of the change of the system target voltage held in the fluctuation program table of the wide-area voltage control time changing device 82 of the control station, the fluctuation of the system voltage is monitored, and the substation A51 which is the upper system. In response to the voltage fluctuation, the tap shortening control is performed by transmitting a shortening signal to the substation in the subordinate system.

  First, before the tap raising operation at the substation A51 (S101), the wide-area voltage control time changing device 82 continues the transmission of the shortening signal to each subordinate substation for 2 seconds (S102: shortening signal transmission means 125). .

  Next, at 90Ry of the subordinate substation, it is determined whether or not the voltage is outside the allowable range of the target voltage (S103, voltage fluctuation information acquisition means 123). Here, the object to be determined as the allowable range is not the 1.5% dead zone in the normal mode (M) but the 1.0% dead zone in the shortened mode (L-1).

  If the result of the determination is outside the allowable range (“YES” in S103), a tap lowering operation is performed at the subordinate substation (S104). Here, the operation time until the lowering operation is performed is not 60 seconds in the normal mode (M) but 1 second in the shortening mode (L-1).

  The tap raising operation at the upper system substation A51 is performed after the tap lowering operation at the lower system substation is completed (S106). Specifically, the tap lowering operation in the subordinate substation is 1 second in the shortening mode, but the tap raising operation in the upper substation A51 requires a normal operation time. When the tap operation of the substation A51 is completed, the tap operation of the subordinate substation has already been completed.

  If the determination result is within the allowable range (“NO” in S103), the tap value is increased in the upper substation A51 without changing the lower tap value (S105). (S106).

  Next, when a tap lowering operation is performed at the upper-level substation A51, the voltage instantaneously drops at the lower-level substations B52, C53 and the like. Therefore, a voltage error can be avoided by performing a tap raising operation in advance when necessary in preparation for an instantaneous voltage drop.

  Note that the tap lowering operation at substation A51 is the same as that for the tap raising operation (S107 to S112), the lower substation tap raising operation is performed at S110, and the substation A51 tap lowering operation at S112. Is done.

  As described above, even if there is a system voltage fluctuation due to a tap fluctuation of the substation A51, there is no lower substation that deviates from the upper and lower limits (S113).

  In the lowering reduction mode (L-1), the tap lowering operation time is 1 second, but the tap raising operation time is 60 seconds as in the normal mode. For this reason, when the voltage deviates from the dead band reduced to 1%, the tap change is completed after 60 seconds, and voltage fluctuations occur in the upper substation during that time. As a result, the tap raising operation is not performed.

[Predictive control for operation of phase adjusting equipment]
FIG. 14 illustrates an operation when a shut-off operation or a closing operation of the shunt reactor (ShR) 513 attached to the substation A51 is performed.

  When the shut-off operation of the shunt reactor (ShR) 513 is performed at the upper level, the voltage rises instantaneously at the lower substations B52, C53 and the like. Therefore, a voltage error can be avoided by performing a tap lowering operation in advance when necessary in preparation for an instantaneous voltage increase.

  Here, only differences from the operation for the tap operation in the upper-level substation shown in FIG. 13 will be described.

  In the present embodiment, an event signal is transmitted from a remote monitoring control device (TC) A31 or the like that performs supervisory control when a high-level operation such as a shunt reactor (ShR) 513 or the like is performed at the upper level. Device operation information acquisition means 124). The shortened signal transmitting means 125 transmits the shortened signal to the subordinate substation based on the received event signal and the control code defined by the event table 132 of the wide-area voltage control time changing device 82 of the control station. Control the tap.

  First, before the shut-off operation of the shunt reactor (ShR) 513 (S201), a lowering shortening signal is transmitted to each substation (S202 / shortening signal transmitting means 125). In this example, transmission of the shortened signal is continued for 2 seconds.

  Thereafter, in the same manner as the operation for the tap operation in the upper system substation (FIG. 12), the determination of the lower system tap control is performed (S202 to 204), and the shunt reactor (ShR) 513 is shut off after the tap control is completed. (S206). Specifically, the tap lowering operation in the subordinate substation is 1 second by the shortening mode, but the shutting operation of the shunt reactor (ShR) 513 is operated after about 10 seconds, so the shunt reactor (ShR) When the shut-off operation 513 is completed, the tap operation of the subordinate substation has already been completed.

  The same operation is performed for the operation of turning on the shunt reactor (ShR) 513 (S207 to S212). After the tap operation of the lower substation is performed in S210, the operation of turning on the shunt reactor (ShR) 513 is performed in S212. Is done.

  As described above, even if there is an operation to shut off or turn on the shunt reactor (ShR) 513, there is no lower substation that deviates from the upper and lower limits (S213).

  The on / off operation of the capacitor (SC) 514 instead of the shunt reactor (ShR) 513 is also the target of the flow. However, when the capacitor (SC) 514 is turned on, the voltage rises and turns off. Since the voltage drops, the top and bottom of each signal is reversed.

  Further, in the power plant 71 and the like, the voltage increases when the phase is late, and the voltage decreases when the phase is advanced.

  As described above, according to the voltage regulation system 1 of the present embodiment, the dead band, which is an operation element of the voltage regulation relay, is reduced, and the tap operation time is shortened, so that the voltage quality can be improved without increasing the number of tap operations. Can be raised.

[Second Embodiment]
Next, a second embodiment according to the voltage regulation system 1 of the present invention will be described. FIG. 15 is a diagram showing an outline of the present embodiment.

  In the first embodiment, tap control is normally performed in the normal mode (M) by the local program controller (10T) 510 in the subordinate substation where the tap change has been performed in the upper substation, and abruptly. In response to system voltage fluctuation, the wide-area voltage control time changing device 82 transmits the shortening signal to the one-shot circuit 512 of the substation substation, thereby performing the tap change shortening control (FIG. 1). The second embodiment is different in that the local program controller (10T) 510 performs the tap change shortening control even for a sudden system voltage fluctuation (FIG. 16).

  Specifically, the local program controller (10T) 510 does not directly control the voltage adjusting relay 511, but the local program controller (10T) 510 transmits a shortening signal to the one-shot circuit 512 at a predetermined time. Thus, the one-shot circuit 512 controls the voltage adjustment relay 511.

  Conventionally, in the program controller (10T) 510, the tap function is controlled to change the target voltage using the timer function. In this embodiment, the program controller (10T) 510 is predetermined by the timer of the program controller (10T) 510. Depending on the pin setting, a shortening signal is output to the one-shot circuit 512.

  Thereby, tap shortening control can be easily realized by utilizing the program controller (10T) 510 installed in a substation or the like.

  In the first embodiment, the shortening signal transmitted from the program controller (10T) 510 or the remote monitoring control device 31 to the one-shot circuit 511 is continuously transmitted within the time determined by the event table 132 or the like. However, the second embodiment is different in that a shortened signal is further generated and transmitted before and after the transmitted shortened signal.

  Here, the reason why the shortening signal continues for a certain period of time is that a certain time is required for an on / off event of the shunt reactor (ShR) 513, the capacitor (SC) 514, etc., and the shortening control is performed during that time. By continuing, it is possible to control tap change safely.

  In the present embodiment, the one-shot circuit 512 shortens the local signal at the beginning and the end of the signal in response to the constant-time shortening control signal transmitted from the program controller (10T) 510 or the remote monitoring control device 31 to the one-shot circuit 512. Is transmitted to the voltage adjustment relay 511 to perform shortening control.

  Specific operations will be described based on the structure of the program controller (10T) 510 and the like.

FIG. 16 is a diagram illustrating an internal circuit such as a program controller (10T) 510 of a substation.
The timer switches 1 to 4 are timers that can fully enter the designated time, and are used for changing the target voltage. That is, when the target voltage is changed according to the time zone, the target voltage is changed by changing the voltage applied to 90 Ry by changing the tap of the autotransformer by this contact. This description is omitted because it is a general configuration. Since the newly added timer switch operates when the target voltage changes, the relays T1 to T4 also operate. Note that 10T1 to 10T4 are auxiliary relays for the lamp circuit.

  When one of T1 to T4 operates, the one-shot circuit operates and transmits a shortened local signal to 90Ry of the voltage regulating relay (FIG. 17). The voltage can be changed without delay of tap control by the shortened local signal at this time.

  FIG. 18 is a diagram for explaining the operation of the one-shot circuit. In the present embodiment, as a shortened control pattern, the shortened local signal is transmitted before and after the tap operation of the upper substation due to the on / off operation of the phase adjusting equipment or the voltage fluctuation. Thereby, even if the upper and lower limit errors occur, the voltage can be quickly adjusted.

Normally, X1 operates when A1 returns (OFF), and the T-timer (TX1) is turned OFF by the b contact of X1.
As for start, when any one of the 10T stage switches is turned on, A1 operates, and X1 of normal excitation is restored when A1 is operating.
The operation holding T timer (TX1) is operated by the return of X1, and the operation time of 90Ry is shortened by the a contact of the T timer (TX1).

After A1 finishes its operation (ON), X1 operates to restore the T timer (TX1), so that everything except A1 is restored. By the movement of A1, X1 performs a return operation to form a one-shot circuit.
The T timer (TX1) continues to hold the shortening control signal by continuing to hold the contact a by delay return.

As for recovery, A1 begins to recover when the 10T stage switch is turned off, and X1 of normal excitation recovers when A1 is in the middle of operation. When X1 returns, the operation holding T timer (TX1) is operated.
Thereby, the operation time of 90 Ry is shortened by the a contact of the T timer (TX1).

  After A1 completes the operation, X1 operates, and the T timer (TX1) is returned by the b contact of X1, so that everything returns. Note that the shortened local signal is continued for a predetermined time by the delayed return of the T timer (TX1).

The voltage adjusting relay (90Ry) 511 or the like that has received these shortened local signals changes the operating time timer and the dead zone.
By this cycle, when the 10T stage switches 1 to 4 are turned on, the shortened local signal is repeatedly output.
In addition, when the input signal of the phase adjusting equipment or the selection signal of the remote monitoring control device (TC) is input, A5 operates to output a shortened local signal by the one-shot circuit.

  In FIG. 19, the operation of the one-shot circuit of this embodiment is shown in a time chart. A shortened local signal is output before and after the event (A1).

  Note that by changing the shortening control pattern of the one-shot circuit, it is possible to set so that the shortened local signal is transmitted only before the turning operation of the phase adjusting equipment or the tap operation of the upper substation due to voltage fluctuation.

  In addition, after completion of the upper-level substation due to the on / off operation of the phase adjusting equipment and the voltage fluctuation, the upper and lower limit errors are confirmed by the remote monitoring control device (TC) A31 or the like, and if the voltage does not recover, the shortened signal is transmitted again. Can also be set.

  As described above, in the voltage adjustment system 1 of the present invention, various effects can be achieved by changing the setting of conditions.

It is the figure which showed the outline in the voltage regulation system 1 concerning the 1st Embodiment of this invention. It is the figure which showed the fluctuation | variation of the voltage value at the time of the change of a target voltage compared with the voltage adjustment system 1 concerning the 1st Embodiment of this invention and the conventional system. It is the figure which showed the fluctuation | variation of the voltage value at the time of injection | throwing-in of phase adjusting equipment, comparing the conventional system and the voltage regulation system 1 concerning the 1st Embodiment of this invention. It is a figure which shows the system configuration | structure example at the time of taking in the voltage regulation system 1 concerning the 1st Embodiment of this invention in an electric power grid | system. It is the figure which showed the basic composition of the system configuration example shown in FIG. It is a functional block diagram in voltage regulation system 1 concerning a 1st embodiment of the present invention. It is a structural example of the fluctuation | variation program table 131 which the memory | storage part 13 of the wide voltage control time change apparatus 82 in the voltage regulation system 1 concerning the 1st Embodiment of this invention hold | maintains. It is a structural example of the event table 132 which the memory | storage part 13 of the wide voltage control time change apparatus 82 in the voltage regulation system 1 concerning the 1st Embodiment of this invention hold | maintains. It is an example of a structure of the management table 133 which the memory | storage part 13 of the wide voltage control time change apparatus 82 in the voltage regulation system 1 concerning the 1st Embodiment of this invention hold | maintains. It is the figure which showed transition of voltage control on condition without control, when entering operation of a shunt reactor (ShR) 513 was performed. It is the figure which showed transition of the voltage control at the time of performing entrance operation of the shunt reactor (ShR) 513 by the voltage regulation system 1 concerning the 1st Embodiment of this invention. It is a flowchart explaining the basic operation of voltage shortening control with higher priority. It is a flowchart explaining operation | movement when tap up-and-down operation is performed in superordinate substation A51. It is a flowchart explaining operation | movement when the interruption | blocking operation or injection | throwing-in operation of the shunt reactor (ShR) 513 attached to the substation A51 is performed. It is the figure which showed the outline in the voltage regulation system 1 concerning the 2nd Embodiment of this invention. 2 is a diagram for describing an internal circuit of a program controller (10T) 10. FIG. It is the figure which showed the relationship between the program controller (10T) 10, a one-shot circuit, and a voltage adjustment relay (90Ry). It is a figure explaining operation | movement of a one-shot circuit. It is the figure which showed the motion of the one-shot circuit with the time chart. It is the graph which showed the target voltage etc. of the electric power system at the time of a peak and an off peak.

Explanation of symbols

1 Voltage adjustment system 2 Communication line 4 Control cable 6 Distribution line 7 Transmission line 8 Bus (BUS)
11 Transmission / Reception Unit 12 Arithmetic Processing Unit 13 Storage Unit 14 Input Unit 15 Output Unit 31 Remote Monitoring and Control Device (TC) A
32 Remote monitoring and control unit (TC) B
33 Remote Monitoring and Control Device (TC) C
51 Substation A (upper system)
52 Substation B (subordinate system)
53 Substation C (subordinate system)
54 Substation D (Upper system)
71 Power plant A (upper system)
72 Power Plant B
81 Control station MP
82 Wide-area voltage control time change device 121 Transmission / reception processing means 122 Input / output processing means 123 Voltage fluctuation information acquisition means 124 Equipment operation information acquisition means 125 Short signal transmission means 126 Voltage determination means 131 Fluctuation program table 132 Event table 133 Management tables 510 and 520 , 530, Program controller (10T)
511, 521, 531 Voltage adjustment relay 512, 522, 532 One-shot circuit 513 Shunt reactor (ShR)
514 Capacitor (SC)
515 Operation mechanism unit 516 Tap changer when loaded

Claims (6)

A voltage adjustment system for adjusting a system voltage using a voltage adjustment circuit connected by communication means,
Voltage fluctuation information acquisition means for acquiring voltage fluctuation control information by communication means when controlling voltage fluctuation at a power generation / substation,
The voltage adjustment circuit of the substation located under the power generation / substation that acquired the control information of the voltage fluctuation comprises a shortened signal transmitting means for transmitting a shortened signal for shortening the operation time of the tap in advance,
The operation time shortened by the shortening signal is set to be shorter than the time at which voltage fluctuation control is completed at the power generation / substation located at the upper level, and the control for changing the tap of the substation located at the lower level is completed. A voltage regulation system characterized in that control of voltage fluctuation is completed later at a power station / substation located at a higher level. The shortened signal transmitted by the shortened signal transmitting means includes a signal for changing the range of the dead band of the voltage adjustment circuit,
The voltage determining means for determining whether or not a voltage of a voltage adjusting circuit in a substation located at a lower level of the power generation / substation is in a dead band range changed by the shortening signal. The voltage regulation system according to 1. When there is an operation of a device that causes a voltage fluctuation in the power generation / substation, the device includes a device operation information acquisition unit that acquires operation information of the device by a communication unit,
The voltage regulation system according to claim 1 or 2, wherein the voltage fluctuation information at the power generation / substation includes the device operation information.   The voltage regulation system according to any one of claims 1 to 3, wherein the voltage fluctuation information in the higher-order power generation / substation includes control information for changing a target voltage according to time.   5. The voltage adjustment system according to claim 1, wherein the device operation information includes a signal for turning on / off a phase adjusting facility including a capacitor and a shunt reactor. A voltage adjustment method for adjusting a system voltage using a voltage adjustment circuit,
When controlling voltage fluctuations at the upper power station / substation, the operation time of the voltage adjustment circuit at the lower power station / substation is set to be shorter than the time when voltage fluctuation control is completed at the higher power station / substation. Shortening and changing the range of the dead zone of the voltage regulator circuit; and
Determining whether or not the voltage of the voltage adjustment circuit in the substation located under the power generation / substation is within the changed dead band range;
When it is determined that the range of the changed dead zone is not included, a step of performing control to change a tap of a voltage adjustment circuit in a substation located below the power generation / substation; and
Completing the control of the voltage fluctuation at the upper power generation / substation after completion of the control to change the tap at the substation located at the lower level;
A voltage adjustment method comprising: