JPH09154235A - System and method for controlling power transmission and distribution system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To operate the system at high efficiency and optimize the system voltage and prevent troubles due to higher harmonic waves by leveling loads. SOLUTION: A control system of a power transmission and distribution system has a plurality of power receiving devices 89, each of which has a controller 91. The power receiving devices 89 have such a function as to generate active and reactive power of a fundamental wave and higher harmonic waves and to supply these powers to a distribution line and receive power from the distribution line. Furthermore, a first central controller for controlling the distribution line is installed in this system. The first central controller stores the information on the structure of the distribution line and collects the information on the on/off state at the present of a switch connected to the distribution line. For the amount of current and electricity on the distribution line, the first central controller sends unique and individual control command signals which it caused the power receiving devices 89 to generate based on the information stored and collected by itself, to the controllers 91 and thereby it makes an optimum cooperative control of the power transfer devices 89.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission and distribution system control system, and more particularly to a power transmission and distribution system control system having various loads and distributed power sources such as solar generators and a control method thereof.

[0002]

2. Description of the Related Art In a power system, various efforts have been made to maintain power quality, such as optimization of system voltage and reduction of harmonics. For example, there are devises such as tap control of transformers of substations of each voltage class and phase adjusting equipment for proper voltage adjustment. In addition, recently, a technology for reducing instantaneous voltage drop and harmonics by using a highly responsive power semiconductor element has been described, for example, in “Semiconductor power conversion circuit (edited by the Institute of Electrical Engineers of Japan, Research Committee for Semiconductor Power Conversion Methods”). And the like.

[0003]

As described above, various efforts have been made to maintain the power quality in the electric power system. However, an increase in the load difference between day and night, an increase in the interconnection of distributed power sources, and a harmonic The surrounding environment surrounding the lower power transmission and distribution system is changing drastically due to an increase in the number of power sources that generate waves, and due to this environmental change, the active / reactive power and harmonics generated from the vast lower power transmission and distribution system The fluctuation range of the current is increasing. Therefore, it is difficult to maintain the power quality only by controlling the voltage or the reactive power in the upper system control station as in the past.

Further, the voltage distribution becomes complicated under a situation in which the system power flow changes variously due to an increase in load difference between daytime and nighttime and an increase in system interconnection of distributed power sources, and thus tap switching and pole transformers as in the prior art. It is difficult to improve the voltage over the entire distribution line by taking partial measures to improve the voltage by switching the sound of fixed taps.

For example, many phase advancing capacitors are connected to the lower power transmission and distribution system to contribute to voltage optimization under heavy load, but a large amount of phase advancing current generated from these phase advancing capacitors under light load. Therefore, there is an example in which the voltage tends to increase toward the lower system, and the voltage increase cannot be prevented even if a large amount of the reactor of the upper system is injected.

Further, when harmonics are generated from an unspecified large number of devices as in recent years, the conventional technique for reducing the harmonics of a specific device or a specific place is sufficient to reduce the harmonics of the distribution line. It could not be reduced. In particular, since the system configuration of the distribution system is constantly changed in response to construction and load distribution changes, conventional technology, such as arranging control equipment only at specific points, cannot cope with the system configuration change and uncontrolled distribution. There was a problem that railroad tracks were generated.

Further, a large amount of harmonic currents generated by a large number of semiconductor-used power sources connected to the lower power transmission and distribution system flows into the upper system having a low impedance, which distorts the voltage of the upper system and the higher system. Various harmonic disturbances are caused in the lower transmission and distribution system connected to.

Conventionally, the upper system monitoring and control station has controlled the voltage and the like on the assumption that only the load is connected to the lower power transmission and distribution system, but many distributed power sources will be system-connected in the future. In such a situation, the upper system supervisory control station will have to control in consideration of the power generation amount of many distributed power sources, and it is expected that control will be substantially difficult in terms of control burden.

An object of the present invention is to provide a control system of a power transmission and distribution system suitable for solving problems of the current power system, such as high efficiency operation by load leveling, optimization of system voltage, prevention of harmonic interference, and the like. It is to provide a control method.

[0010]

In a control system for a power transmission and distribution system according to one aspect of the present invention, a plurality of power transfer devices each having a control device are provided. In addition, those power transfer devices are connected in a distributed manner along the power distribution line. The power transfer device has a function of generating active and reactive power of a fundamental wave and a harmonic wave and supplying the active power and reactive power to a power distribution line and receiving power from the power distribution line. Furthermore, a first central control unit for controlling the distribution line is provided. The first central control unit stores information about the structure of the distribution line, collects information about the current on / off state of each switch connected to the distribution line to divide the distribution line into sections, and Based on the stored and collected information regarding the current and electric quantity of, the individual power control devices generate individual control command signals, and those control command signals are transmitted to the respective control devices. Control the power transfer device. As a result, the desired target state of the distribution line is automatically achieved in the distribution line by the optimal coordinated control of the respective power transfer devices.

In the control system of the power transmission and distribution system according to the present invention, there is further provided a second central control device for controlling the upper power transmission line connected to the power distribution line via the step-down transformer. The second central control unit collects the current-electricity amount in the step-down transformer via the first central control unit, determines a target state in the step-down transformer with respect to the collected current-electricity amount in the step-down transformer, and determines the target state in the first central unit. Send to controller. Thereby, the first central controller determines the desired target state of the distribution line, compares it with the periodically collected current and quantity of electricity and of the current and quantity of electricity from the target state of the concerned distribution line. If the deviation exceeds a predetermined tolerance, a separate control signal is generated to reduce such deviation. As a result, the desired target state of the distribution line is automatically achieved in the distribution line by the optimal coordinated control of the respective power transfer devices.

The invention according to another aspect of the present invention is a method for controlling a power transmission and distribution system in which electric power is supplied from a higher power system via a power transmission and distribution transformer. This method includes the steps of receiving a command value for the amount of electricity passing through the power transmission and distribution transformer from the host system control device, measuring the amount of electricity passing through the power transmission and distribution transformer, and the command value of the amount of electricity and the passing electricity. The step of obtaining the deviation of the amount, and when the deviation is larger than a predetermined allowable amount, the amount of electric power exchanged between the electric power transfer device connected to the power transmission and distribution system and the power transmission and distribution system is controlled. Have stages.

[0013]

DETAILED DESCRIPTION OF THE INVENTION One embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, an electric power system connected to the upper grid 61a is connected to a power transmission substation 63a connected to the upper grid 61a via a power transmission line 62a and to a power transmission substation 63a via power transmission lines 64a and 64b. Power transmission system 65
a, 65b, and the power transmission line 66 in the power transmission systems 65a, 65b.
a, substation 67a, 67 connected via 66b
b, and distribution lines 68a, 6 at the distribution substations 67a, 67b.
Power distribution system 69 connected via 8b, 68c, 68d
a, 69b, 69c, 69d. Here, the expression that the transmission and distribution line is connected to the substation means that it is actually connected to a transformer (not shown) provided in the substation, as described later. Since the power system connected to the upper system 61b has the same configuration, the description thereof will be omitted. Information about the amount of electricity in the system is collected from the distribution systems 69a, 69b, 69c, 69d to the distribution system monitoring and control station 70 via the communication line 71. Distribution substation 67
Information from a and 67b is similarly distributed to the distribution system monitoring control station 70.
Will be collected. Similarly, from the power distribution system monitoring and control station 70, the power distribution systems 69a, 69b, 69c, 6 are connected via the communication line 71.
A control command is output to a power transfer control device (not shown) provided in 9d. In addition, the distribution substations 67a and 67b
A control command is also output to a power transfer control device (not shown) provided in the. From the distribution system monitoring and control station 70, only the amount of electricity such as active / reactive power and harmonic current passing through distribution transformers (not shown) provided at the distribution substations 67a and 67b is supplied to the regional transmission system monitoring and control station. 72 to be transmitted as information. At the local power transmission system monitoring control station 72, a control command for power transfer (not shown) is created based on the information about the amount of electricity from the power distribution system monitoring control station 70, the power transmission / distribution systems 65a and 65b, and the power transmission substation 63a. Power transmission system 65
a, 65b or the power transmission / reception control device provided in the power transmission substation 63a. Only the amount of electricity such as active / reactive power and harmonic current that passes through a transformer (not shown) provided in the transmission substation 63a is transmitted from the regional transmission system monitoring control station 72 to the upper system monitoring control station 73. Sent as. The above operation is similarly performed for the power system connected to the upper system 61b.

A specific configuration of the distribution substation 67b and the distribution systems 69c and 69d connected to the distribution substation 67b will be described with reference to FIG. In FIG. 2, the distribution substation 67b is connected to the upper system 6 via a transmission line 66b.
Distribution transformers 80a, 8 connected to 1a (not shown)
0b is provided. A plurality of distribution lines 82a, 82 are connected to the distribution transformers 80a, 80b via bus bars 81a, 81b.
b, 82c and 82d are connected. Where the transmission line,
Bus lines and distribution lines are generally composed of three phases, but they are shown as single lines in the drawings for simplicity. On the secondary side of the distribution transformer 80a, a measuring device including a sensor 83 for measuring active / reactive power and harmonic current passing through the distribution transformer 80a and a measuring slave station 84 is attached. Measurement slave station 84
The output from the distribution system monitoring and control station 7 via the communication line 86.
Sent to 0. Effective passing through distribution transformer 80b
Since the reactive power and the harmonic current are also measured, the measuring means having the same configuration is used and the description thereof is omitted. The structure of the power distribution line 82c will be described as an example. A measuring device 87 is attached to the outlet of the power distribution line 82c. Distribution line 8
A power transfer device 89 is connected to 2c via an output transformer 88. Here, the power transfer device 89 is, for example, an active / reactive power generation device to which a distributed power source or a power semiconductor is applied, and the active / reactive power of the fundamental wave and harmonics of the power is distributed to the distribution line. 82c indicates a device having a function of exchanging data with the device 82c. A sensor 90 is mounted between the power distribution line 82c and the power transfer device 89 to measure the amount of transferred power, and its output is connected to the control slave station 91. The control slave station 91 also receives the output of a sensor 92 for measuring the voltage of the distribution line, active / reactive power, and harmonic voltage / current. The control slave station 91 is connected to the distribution system monitoring control station 7 via the communication line 93.
It is connected to 0 and the information of the quantity of electricity is sent. A device having a similar configuration is also attached to other parts of the distribution line or the bus bar of the distribution substation. Also, sensors for measuring the voltage, active / reactive power, and harmonic voltage / current of the distribution line are installed at appropriate points along the distribution line. This includes, for example, a sensor that measures only the voltage.

In the above configuration, the distribution system monitoring control station 7
The control operation of the entire power transmission and distribution system at 0 will be described with reference to FIG. In step S31, target values P of active power, reactive power, and harmonic current passing through the distribution transformer are set.
_{The s} *, Q _s *, and I _hs * are received from the regional transmission system monitoring control station 72. These target values may be made to flow from the distribution system 69d to the transmission system 65b through the distribution transformer 80a in order to suppress the voltage distortion of the local transmission system within several percent when taking the harmonic current as an example. It is set in consideration of the limit value of harmonic current. Similarly, active power is determined in terms of load leveling and overload prevention, and reactive power is determined in terms of the phasing ability of the upper system including the transmission system and the ease of control. In S32, the target values V _d *, P _d *, Q _d * of the voltage along the distribution line, active power, reactive power, harmonic voltage, and current,
V _hd * and I _hi * are set. This target value is also determined in consideration of maintaining power quality along the distribution line and preventing overload or load imbalance between regions. This target value may change along the distribution line. In S33, the measurement slave stations 84 and 87, the control slave station 9
Voltage of point i, which is measured in such 1, active power, reactive power, harmonic voltage and current _{V i, P i, Q i} , V hi, I hi is polled, is collected in the distribution system monitoring and control stations 70 It However, not all the electric quantities are taken in at all points, and only the information such as the voltage may be sent as described above. In S34, the distribution transformer 80
Measured values P _s , Q _s , and I _{hs of} active power, reactive power, and harmonic current passing through a and 80 b and target values P _s *, Q _s *, and I _hs *
The deviation of is calculated. In the calculation here, the reason why the deviation between the active power and the reactive power is an absolute value is to suppress the active power and the reactive power passing through the distribution transformers 80a and 80b within a certain range. On the other hand, the absolute value of the harmonic current is not taken in order to keep the harmonic current within the maximum limit. In S35, the measured values V _i , P _i of the voltage, active power, reactive power, harmonic voltage / current in the distribution line,
Q _i , V _hi , I _hi and target values V _d *, P _d *, Q _d *, V _hd *,
The deviation from I _hi * is calculated. In S36, it is determined whether the deviation obtained in S34 and S35 does not exceed a predetermined deviation, and if it exceeds the deviation, in S37 the power transfer device connected to the power distribution line or the busbar. Is adjusted to reduce the deviation. As this control method, for example, the power transfer amount is controlled little by little from the power transfer device which is highly sensitive to the deviation, and if the control reduces the overall deviation, the control is adopted as it is. Empirical methods such as Further, the distribution system monitoring and control station 70 has a database beforehand with deviation information that can improve each power transmission / reception device for the distribution system, so that an optimum command can be given to each device.
In S36, if the deviation does not exceed the allowable value, S is again performed.
Returning to step 31, the procedure described above is repeated at regular intervals. From the distribution system monitoring and control station 70, a distribution transformer 80
Only the active / reactive power and the harmonic current passing through a and 80b are transmitted as information to the regional transmission system monitoring control station 72.

According to the example described above, there is an effect that the voltage, the active power, the reactive power, the harmonic voltage / current, etc. can be entirely optimized as a higher-order transmission system and distribution system. . Further, in the local power transmission system monitoring and control station 72, only active power, reactive power, and harmonic current passing through the distribution transformers 80a and 80b, which are connection points between the power transmission system 65b and the power distribution systems 79c and 79d, may be monitored. ,
From the viewpoint of the higher-level supervisory control station, the power distribution system is merely a load existence in which active power, reactive power, and harmonic current are managed, so there is an effect that the supervisory control load on the higher-order control station can be reduced.

Further, since the voltage, active power, reactive power, high frequency voltage and current can be optimized for each distribution system connected to the power transmission system, there will be no obstacle to the transmission line. can do.

Since the power that can be transferred may be limited depending on the state of the power transfer device, the distribution system monitoring control station 70 also collects the amount of electricity of the power transfer device and reflects it in the control. Is also good. In this case, the limit of the amount of power transfer of the power transfer device is reflected in the control, so that there is an effect that more accurate control becomes possible.

Another embodiment of the present invention will be described below with reference to FIG. In FIG. 4, the distribution system is connected to a main transformer 1 for converting the supply voltage from the higher-order power system into a distribution voltage, and to the main transformer 1 via a bus bar 2 and circuit breakers 3a, 3b, 3c. Distribution line 4
a, 4b, 4c. Distribution lines 4a, 4
Switches 5a-1 to 5c-2 are connected in series to b and 4c. In addition, the switches 6a to 6 that interconnect the distribution lines
g is also connected. In addition, the bus 2 and the distribution lines 4a, 4b,
4c is generally composed of three phases, but is shown as a single line for simplicity in the drawing.

Now, taking the distribution line 4a as an example, the system voltage sensor 10 is provided in each section separated by a switch.
A power transfer system 16 including a power supply side current sensor 11, a load side current sensor 12, an output current sensor 13, an output transformer 14, and a power transfer device 15 is connected. The power transfer device 15 is connected to the central controller 18 via communication lines 17a, 17b, 17c.

The internal configuration of the power transfer device 15 will be described with reference to FIG. The power transfer device 15 includes an inverter 20 connected to the output transformer 14, a power source 21 for supplying power to the inverter 20, a control unit 22 for controlling the switch timing of the inverter 20, and a communication terminal 23 connected to the control unit 22. It is composed of The communication line 16 is connected to the communication terminal 23. The control unit 22 includes a system voltage sensor 10, a power supply side current sensor 11, a load side current sensor 1
2. The output signal from the output current sensor 13 is input.
Where Vs, Is1, Is2, Ii: system voltage sensor 1 respectively
0, the power source side current sensor 11, the load side current sensor 12, and the output current sensor 13.

The internal structure of the control unit 22 will be described with reference to FIG. The control unit 22 includes a switch 31 to which output signals from the power supply side current sensor 11 and the load side current sensor 12 are input, an output signal of the switcher 31 and the output current sensor 13.
Current comparator 32 to which the output signal from the device is compared, control signal converter 33 to which the output signal is input, voltage comparator 34 to compare its output with the output signal (Vs) of the system voltage sensor 10, and its output signal It is composed of a control signal output unit for generating an output signal of the inverter from

The configuration of the central controller 7 will be described with reference to FIG. The central control unit 7 uses the communication lines 16a, 16
b, 16c, a communication terminal 40, a CPU 41, a system information database 42 connected to the CPU 41, which stores data such as system connection relationships and system constants, and a PCU 41, which is separately collected via the communication terminal 40. A control constant calculation device 44 that calculates the control constant of each power transfer device based on the information of the current system recognition device 42 and the current system recognition device 43 that recognizes the current system configuration from the switch on / off information.
It is composed of

The operation of the CPU 40 of the central control unit 7 of the power distribution control system for distribution configured as above will be described with reference to FIG. In S51, the current on / off state of the switch connected to the system is collected via the communication terminal.

In S52, a system information database indicating which distribution line is connected to which distribution line through which switch is read. This database contains
It does not include switching information for switches. Therefore, S5
In 3, the current system configuration is recognized from the system configuration information obtained in S52 and the current switch on / off state information obtained in S51. In S54, electricity quantity information such as voltage and current is collected from the sensor attachment point for measuring the current electricity quantity. Here, the sensor is attached to a representative point that represents the electrical state of the system other than the power transmission / reception subsystem attachment point (not shown). At S55, the control constant of each power transfer system is calculated from the current system configuration obtained at S53 and the electric quantity information of the sensor attachment point obtained at S54. Here, the control constants are set so that the power transfer subsystems attached to the respective points operate in cooperation.
For example, in the case of harmonic suppression, when there is no coordinated control operation, only subsystems close to the harmonic source perform full harmonic suppression operation, and other subsystems do not operate much. The phenomenon that the subsystem is burdened occurs. Further, in terms of voltage, reverse control operation of voltage occurs in the system unless cooperative control operation is performed. That is, the operation of each power transfer subsystem is
Since the voltage at each point of the grid is changed, the power transfer subsystem at one point is operating to raise the grid voltage when the coordinated control operation is not performed, while the power transfer subsystem at another point is to lower the grid voltage. Doing so may cause a strange movement. According to the present invention, in order to prevent the following undesired operations, it is possible to recognize the installation positional relationship in the system such as whether the power transfer system is closer to the power supply side or closer to the non-end side, and the harmonic current is large. Each power transfer subsystem is controlled at what speed and with what gain in relation to other power transfer subsystems based on the understanding of the relationship with the amount of electricity in the system such as whether it is located at a location Calculate whether it should. In S56, those control constants are transmitted to each power transfer subsystem via the communication terminal 40 and the communication lines 16a, 16b, 16c.

Further, in the present invention, the special communication line 1
Even without using 6a, 16b, 16c, for example,
By using the distribution system synchronous transmission method as shown in No. -24328, it becomes possible to perform communication between the central control unit and each power transfer subsystem by using the distribution system as a medium for control signals.

The operation of the control unit of each power transfer subsystem will be described with reference to FIGS. 6 and 9. In S61,
Sensor output signals Vs, Is1, Is2, Ii are taken in. S6
In 2, the positional relationship in the system of the power transfer subsystem and the control constants of the power transfer subsystem are loaded into the switch 31 and the control signal converter 33 via the communication terminal 23. In S63, the switch of the switch 31 is
The load-side current signal used for control is switched based on the positional relationship information captured in S62. Here, the reason for using the load-side current information is that since the current output from the power transfer subsystem generally flows to the current side, it can be controlled by using the load-side current information that is less affected by the output of the power transfer subsystem. This is because it becomes relatively easy.

This power transfer subsystem determines the state of the upper power system and the open / close state of the switch in order to determine which side of the connected distribution line is the load side. The central controller 18 determines the power flow direction of the route to which the power transfer subsystem is connected, and sends the information to the control unit 2 via the communication line and the communication terminal 23.
Alternatively, the power transfer subsystem may determine the power flow direction.

In the case of the power transfer subsystem 16, Is2
Is a load-side current, it is switched so that Is2 is taken in. In S64, the comparator 32 compares the load-side current Is2, which is the output of the switching device, with the output current Ii,
The difference ΔI is output. In S65, the control signal converter 33
The difference ΔI is converted into the voltage command signal V * by using the control constants such as the control speed and the gain that have been taken in. S
At 66, the voltage command signal V * is compared with the system voltage, and the current Ii corresponding to the difference voltage is output from the power source 21 shown in FIG. 2 to the system side in cooperation with other power transfer subsystems. Inverter control signals such as
Output to 0. As described above, the current supplied from the power source 21 to the grid can be adjusted in various ways by changing the switch timing of the control signal conversion unit inverter 20 while coordinating the control constants as a whole. It is possible to eliminate overloads throughout the system, optimize the voltage, or suppress harmonics by using the reverse-phase output current.

In the above example, the case where the load side current is used for control has been described. However, when the current output from the power transfer subsystem is shunted to the power supply side or the load side due to the system constant, The control accuracy can be improved by controlling the power supply side current together with the load side current.

Still another example of the present invention will be described with reference to FIG. In FIG. 10, the same parts as those in FIG. The main transformer 50 has
A voltage tap switching device (not shown) capable of raising and lowering the secondary side voltage is attached, and a sending voltage control device 51 for controlling the voltage tap switching is connected. A bus voltage sensor 52 is connected to the bus 2, and the output of the bus voltage sensor 52 is sent out and input to the voltage control device 51. The power transfer subsystem 16 and the like are connected in parallel to the power distribution line 3a, and the line voltage regulator 53 is connected in series. Here, as a connection point of the power transfer system, the vicinity of the peaks and valleys of the voltage distribution is selected in consideration of the voltage distribution when the system configuration changes. A voltage regulator control device 54 is connected to the line voltage regulator 53. The voltage regulator controller 54 includes:
The voltage at the installation point of the line voltage regulator 53 is input by the system voltage sensor 55 that measures the voltage. Voltage transfer subsystem 1
6 and voltage regulator controller 54 are connected by communication line 17 to central controller 18. In addition, here, the line voltage sensor is the power transfer subsystem 16 and the line voltage regulator 8
However, it is not limited to the installation point of the equipment, but it should be installed at a location where the voltage profile over the entire distribution line voltage can be grasped, including means such as estimation. Further, in the power transfer subsystem, a location where the voltage can be optimized is selected in consideration of the system configuration, line constant distribution, load distribution and the like.

The operation will be described with reference to FIGS. 10 to 12. Generally, since the power transfer subsystem 16 uses the power semiconductor element, it can quickly approach the target voltage even in voltage control. On the other hand, the voltage control by the main transformer 50 with a tap and the line voltage regulator 53 uses a mechanical tap, so that the response is slow. Therefore, after the power transmission / reception subsystem 16 operates in the direction of increasing the system voltage, the voltage may be inversely decreased by the voltage tap switching, and then a wasteful operation may occur. In the present invention, this problem is solved by providing the sending voltage control device 51 or the line voltage regulator 53 with an operation sensitivity changing unit. Based on FIG. 11, the configuration of the sending voltage control device 51 will be described as an example.
In FIG. 11, the sending voltage control device 51 includes a voltage change calculation unit 201, a voltage comparison unit 202, and an operation sensitivity change unit 203.
It consists of. The output Va0 of the bus voltage sensor 52 is
The voltage change calculation unit 201 inputs the voltage change calculation unit 201 and the voltage comparison unit 202 compares it with the target voltage Vref. The outputs of the voltage change calculation unit 201 and the voltage comparison unit 202 are input to the operation sensitivity changing unit 203. The output of the operation sensitivity changing unit 203 is input to the tapped main transformer 50. Operating sensitivity changing unit 2
03, the input from the voltage comparison unit 202, that is, the voltage deviation Va0-Vref from the reference voltage and the voltage change calculation unit 201.
Based on the input Vd from, the time until the voltage tap of the main transformer 50 starts the switching operation according to the sensitivity curve shown in FIG. 12 (hereinafter referred to as the voltage tap switching operation start time) is set. To do. As shown in FIG. 12, even in the case where the voltage deviation is large in the negative direction at points a and b, different voltage tap switching operation start times are set depending on the magnitude of the voltage change rate Vd. Va0 is Vre at points a and b
When it is smaller than f and the sending voltage control device 51 operates to increase the voltage Va0 by operating the voltage tap in the upward direction, when the voltage change rate Vd is large in the positive direction as at point b, the It is determined that each power transfer subsystem connected to the power distribution line is operating in the direction of increasing the voltage, and the voltage tap switching operation start time is delayed or the dead band is widened. As a result, it is possible to prevent the reverse operation due to the voltage tap switching of the main transformer or the line voltage regulator 8 while the power transfer device is performing the voltage increasing operation or after the operation is completed. Here, the sending voltage control device 5
1 has been described as an example, the line voltage regulator 53 has a similar operation and configuration, and a description thereof will be omitted.

[0034]

As described above, according to the control system and the control method of the power transmission and distribution system of the present invention, the present power consumption such as high-efficiency operation by load leveling, system voltage optimization, and harmonic interference prevention is provided. It is possible to solve the problems that the system has.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a power transmission / distribution system to which the present invention is applied.

FIG. 2 is a diagram showing a configuration of an embodiment of a control system for a power transmission and distribution system according to the present invention, which is applied to the power transmission and distribution system shown in FIG.

FIG. 3 is an operation flow diagram of a distribution system monitoring and control station in the embodiment of FIG.

FIG. 4 is a diagram showing the configuration of another embodiment of the control system for a power transmission and distribution system according to the present invention, which is applied to the power transmission and distribution system shown in FIG.

5 is a diagram showing an internal configuration of a power transfer subsystem 16 in the embodiment example of FIG.

6 is a diagram showing an internal configuration of a control unit 22 of FIG.

FIG. 7 is a central controller 18 in the embodiment of FIG.
FIG. 3 is a diagram showing an internal configuration of the device.

FIG. 8 is a central controller 18 in the embodiment of FIG.
FIG. 5 is an operation flow chart of FIG.

FIG. 9 is a central controller 18 in the embodiment of FIG.
FIG. 5 is an operation flow chart of FIG.

FIG. 10 is a diagram showing the configuration of still another embodiment of the power transmission and distribution system control system according to the present invention, which is applied to the power transmission and distribution system shown in FIG. 1;

11 is a diagram showing an internal configuration of a delivery voltage control device 51 in the embodiment example of FIG.

12 is a diagram showing a characteristic example of a sensitivity curve of the operation sensitivity changing unit 203 of FIG.

[Explanation of symbols]

61a, 61b ... Upper system, 69a-69h ... Distribution system, 70 ... Distribution system monitoring control station, 72 ... Regional power transmission system monitoring control station, 73 ... Upper system monitoring control station, 80a, 80b
… Distribution transformer, 89… Power transfer device, 91… Control slave station (power transfer control device).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuzuru Imamura 7-1, 1-1 Omika-cho, Hitachi City, Ibaraki Hitachi Ltd. Hitachi Research Laboratory (72) Inventor Shinya Yato 7-chome, Omika-cho, Hitachi City, Ibaraki Prefecture No. 1 Hitachi Ltd. Hitachi Research Laboratory (72) Inventor Masahiko Amano 7-1-1 Omika-cho, Hitachi City, Ibaraki Prefecture Hitachi Ltd. Hitachi Research Laboratory (72) Inventor Masahiro Watanabe Mika Hitachi, Ibaraki Prefecture 7-1-1, Machi, Hitachi Co., Ltd. Hitachi Research Laboratory

Claims (7)

[Claims] 1. A transmission line, a distribution transformer connected to the transmission line, a distribution line connected to the distribution transformer, and a plurality of switches for dividing the distribution line into sections. A plurality of power transfer devices having control devices distributedly connected along the distribution line; and a first central control device for controlling the distribution line, wherein the first central control device comprises: Information about the structure is stored, information about the current on / off state of each of the switches is collected, and based on the stored and collected information at least with respect to the amount of current and electricity on the distribution line where the power transfer device is present. To generate individual control command signals unique to each of the power transfer devices, and to send the control command signals to each of the control devices so that the desired target state of the distribution line is A control system for a power transmission and distribution system, characterized in that each of the corresponding power transfer devices is controlled so as to be automatically achieved in the power distribution line by the optimal coordinated control of each power transfer device. 2. The control system for a power transmission and distribution system according to claim 1, further comprising a second central control device for controlling the power transmission line, wherein the second central control device is the first central control device.
A current / electricity amount in the distribution transformer is collected through a central control device, a target state in the distribution transformer is determined with respect to the collected current / electricity amount in the distribution transformer, and the target state is set to the first central state. While transmitting to the control device, the first central control device determines the desired target state of the distribution line, compares it with the current quantity of electricity collected periodically, and from the relevant distribution line target state. When the deviation of the amount of current and electricity exceeds a predetermined permissible range, a control system for a power transmission and distribution system, which generates an individual control signal for reducing such deviation. 3. The control system for a power transmission and distribution system according to claim 1, wherein the power transfer device is a continuously variable type. 4. A plurality of distribution lines to which electric power is supplied from a higher-level power system, a plurality of switches for dividing the distribution line into sections, and a plurality of control devices connected in a distributed manner along the distribution lines. And a central control device that transmits the power flow direction of a power distribution line to which the power transfer device is connected to the power transfer device. 5. A plurality of distribution lines to which power is supplied from a higher-level power system, a plurality of switches for dividing the distribution line into sections, and a plurality of control devices connected in a distributed manner along the distribution line. And a central control unit that appropriately controls the power characteristics from the start point to the end of the distribution line by continuously changing the power transfer amount of the power transfer apparatus. Transmission and distribution system control system. 6. A plurality of distribution lines to which electric power is supplied from a higher-order power system, a plurality of switches for dividing the distribution line into sections, and a plurality of control devices connected in a distributed manner along the distribution lines. Power supply device, a central control device for controlling the distribution line, a voltage adjusting device connected to the distribution line, and a device for adjusting the operation sensitivity of the voltage adjusting device. Transmission and distribution system control system. 7. A power transmission / distribution system in which power is supplied from a higher power system via a power transmission / distribution transformer, and a command value of the amount of electricity passing through the power transmission / distribution transformer is received from a higher power system controller. Measuring the amount of electricity passing through the power transmission / distribution transformer, obtaining a deviation between the command value of the electricity quantity and the passing electricity quantity, and transmitting / distributing the electricity when the deviation is larger than a predetermined allowable amount. A method of controlling a power transmission / distribution system, comprising controlling an amount of power exchanged between a power transmission / reception device connected to a power system and the power transmission / distribution system.