JP2009159735A - Distribution system operation system and its method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a stable distribution system operation by enabling power supply to a distribution system including an unexpected large consumer in a conventional manner and by maintaining the voltage of the entire power distribution lines at appropriate values. <P>SOLUTION: The distribution system operation system for supplying power to a distribution system including a large consumer is equipped with multiple loops configured by linking a plurality of power distribution lines 3 via a circuit breaker 8, and with a voltage monitoring controller 16 for controlling the voltage in the distribution system. The voltage monitoring controller 16 estimates the voltage of the entire power distribution line based on the measured information of the plurality of nodes in the distribution system, and when the voltage is not within an appropriate range, the voltage monitoring controller controls the voltage in the distribution system by controlling the voltage regulators 1, 9 set in the distribution system. The multiple loops include distribution lines with and without a branched load. The voltage monitoring controller 16 controls the voltage in the distribution system by enlarging the appropriate range of the voltage in the distribution line without the branched load relative to the distribution line with the branched load, from among the plurality of distribution lines constituting the multiple loops. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to the configuration and operation of a power distribution system for supplying power to a power distribution system including large-volume consumers.

  As a configuration of the power distribution system, there are a dendritic method, a loop method, a spot network method, and the like (for example, see Non-Patent Document 1). Of these, the dendritic method is adopted in many areas except for specific areas.

  In addition, the loop system is a system in which the distribution lines are linked by a switch (loop point switch) to form an annular shape. When the load characteristics of the both distribution lines are different, By doing so, there is an advantage that the current distribution is improved, the voltage drop and the power loss are small, and the flexibility is high.

  In this loop method, the loop point switch is always open, and when a failure occurs or when a power failure occurs, the loop point switch is automatically turned on and reversely fed, and the loop point switch is always closed. There is a closed loop system, but a multiple loop system combining a plurality of loop lines is also considered. However, as described in Non-Patent Document 1, in the current situation in Japan, when the loop method is used, it is generally operated in a normally open loop method that can adopt a high-sensitivity selective grounding protection method. In many cases, the above-described advantages of the loop are not fully utilized.

  On the other hand, voltage adjustment in the distribution system can be broadly classified into adjustment of substation transmission voltage, adjustment of line voltage, and adjustment of voltage at the consumer receiving end. Currently, the bus voltage batch adjustment method is mainly used to adjust the substation transmission voltage, and the specific method is a line voltage drop compensator (LDC) method that adjusts the transmission voltage according to load fluctuation. In addition, as a voltage regulator, a load tap change transformer (LRT), a load voltage regulator (LRA), and the like are employed (see, for example, Patent Documents 1 to 3).

  As for the line voltage adjustment, a line voltage regulator such as a step-type automatic voltage regulator (SVR) is used in a distribution line having a long span and a large voltage drop. In addition, a power capacitor (SC), The voltage may be adjusted by adjusting the reactive power flowing through the distribution line using a static reactive power compensator (SVC) or the like (see, for example, Patent Document 4). The voltage at the consumer receiving end is adjusted by a pole transformer tap or the like (see, for example, Patent Document 5).

  In addition, when the distribution system configuration is a dendritic system, there is a difference in voltage drop between distribution lines in a distribution system with distribution lines with greatly different demand fluctuation patterns. It is difficult to maintain the same voltage at the same appropriate value. Moreover, even in a distribution system with a line connected to a distributed power source, there is a difference in voltage drop between a line connected to the distributed power source and a line without a distributed power source, and it is difficult to maintain the same appropriate value. There is a case.

  By the way, in recent years, there has been a tendency to increase the number of large-scale customers represented by large-scale shopping malls in the suburbs as consumers in the distribution system, but if there is a new application from such large-scale customers, the supply voltage This decision is usually judged by the contract capacity. When a new distribution line is required for a new application from a large customer, the supply voltage is generally higher, the longer the distribution line length, the higher the construction cost and the longer the construction period. Tend to be. For this reason, as one method for newly establishing a distribution line at a low cost in a short period of time, a method of supplying power through a distribution line having a supply voltage as low as possible is conceivable.

JP 2003-92828 A JP-A-9-28037 JP 7-163051 A JP2004-266915 JP-A-2005-341668 Electrical Engineering Handbook 6th Edition, The Institute of Electrical Engineers, Ohmsha, February 2001, ISBN: 4886860125

  However, the prior art as described above has the following problems. First, when supplying power to a distribution system including large customers, the transmission capacity that can be supplied by the conventional dendritic method is limited by the specifications of overhead cables and wires used as distribution lines, and consumers that exceed that capacity Cannot supply power. On the other hand, if the loop form is an annular form, the transmission capacity can be secured compared to the dendritic form, but if the demand fluctuation pattern and line impedance of both distribution lines to be looped are different, the load current is One distribution line is biased and a problem of exceeding the allowable value occurs.

  In particular, when power is supplied to larger consumers than expected, if the fluctuation pattern of demand between distribution lines including large consumers and other distribution lines is different, the difference in voltage drop will be more than conventional, In the conventional bus voltage batch adjustment method such as the LDC method, it is expected that it will be more difficult than before to maintain the voltage of all the distribution lines at the same appropriate value.

  The present invention has been proposed in order to solve the problems of the prior art as described above, and the purpose thereof is to supply power to a distribution system including large consumers more than the conventional assumption, And it is providing the power distribution system operation system and method which enable stable power distribution system operation by maintaining the voltage of the whole distribution line at an appropriate value.

  The present invention has been proposed based on the idea of making a plurality of distribution lines into multiple loops, and has the following technical features.

  The distribution system operation system according to claim 1 is a distribution system operation system that supplies electric power to a distribution system including large-volume consumers. A plurality of distribution lines of the distribution system are used for distribution line linkage provided in each distribution line. It is characterized by having a multiplex loop configured by linking through a circuit breaker and a voltage monitoring control device for controlling the voltage of the distribution system, and in particular, the configuration of the multiplex loop and the voltage corresponding thereto It has a feature in the function of the monitoring control device. Here, the voltage monitoring and control device is configured to measure the voltage and current of the plurality of nodes of the distribution system, and the voltage of the entire distribution line of the distribution system based on the line impedance and load information of the distribution line that is held in advance. Is a device for controlling the voltage of the power distribution system by evaluating whether or not is within the proper range and controlling the voltage regulating device installed in the power distribution system when it is not within the proper range. The multiple loop includes a distribution line having no branch load and a distribution line having a branch load. And the voltage monitoring control device expands the appropriate range of the voltage of the distribution line without the branch load with respect to the distribution line with the branch load among the plurality of distribution lines constituting the multiple loop, and the distribution system Configured to control the voltage of the.

  The distribution system operation system according to claim 8 is a distribution system operation system that supplies power to a distribution system including a large-volume consumer. For the distribution system linkage system, a plurality of distribution lines of the distribution system are provided on each distribution line. It is characterized by comprising a multiple loop configured by linking through each circuit breaker and a voltage monitoring control device for controlling the voltage of the distribution system, and in particular, the function and distribution of the voltage monitoring control device. It is characterized by the configuration and function of each circuit breaker for linking wires. Here, the voltage monitoring and control device is configured to measure the voltage and current of the plurality of nodes of the distribution system, and the voltage of the entire distribution line of the distribution system based on the line impedance and load information of the distribution line that is held in advance. Is a device for controlling the voltage of the power distribution system by evaluating whether or not is within the proper range and controlling the voltage regulating device installed in the power distribution system when it is not within the proper range. In addition, each circuit breaker for distribution line linking has a measurement function that measures the amount of electricity in the distribution system, an accident determination function that determines whether there is a distribution line accident, and a selective interruption that selectively blocks distribution lines that have caused distribution line accidents. It is configured as a shut-off device having functions. Furthermore, each interruption | blocking device for distribution line linkage is based on the amount of electricity measured by the said measurement function, and when it is determined that the distribution line accident has occurred by the accident determination function, the distribution line in which this distribution line accident has occurred is determined. The selective cutoff function is used to selectively cut off part or all of the multiplex loop, and when the distribution line fault is recovered, the redistribution is performed and the distribution line is configured to multiplex loop again. The

  The distribution system operation method according to claims 9 and 10 is obtained by grasping the distribution system operation system according to claims 1 and 8 from the viewpoint of the method.

  According to the present invention having the features as described above, it is possible to secure a sufficient transmission capacity for a distribution system including a large-volume consumer that exceeds the conventional assumption by first forming a multiple distribution loop. It becomes. In addition, the voltage of the entire distribution line is controlled by evaluating the voltage of the entire distribution line based on the measurement information of the voltage and current of multiple nodes in the distribution system, and controlling the voltage regulator of the distribution system according to the evaluation result. Therefore, even if the demand fluctuation pattern of each distribution line is greatly different, it is possible to maintain the voltage of all distribution lines within the appropriate range compared to voltage control by the bus voltage batch adjustment method such as LDC method, Stable distribution system operation can be performed.

  In addition, when new distribution system facilities are installed for new large-volume customers, depending on the contracted capacity with the large-volume customers and the length of the distribution line from the distribution substation to the large-volume customers, It is advantageous to supply power by making a distribution loop of a voltage class lower than the voltage into multiple loops, so that the construction cost is reduced and the construction period is shortened.

  Furthermore, according to invention of Claim 1, 9, the multiple loop containing the distribution line which does not have a branch load, and the distribution line which has a branch load is comprised, Among the multiple loops, the distribution line which does not have a branch load By controlling the voltage of the distribution system by expanding the appropriate voltage range, the restrictions on the voltage control of the entire distribution system are relaxed. The voltage adjustment of the whole system becomes easy.

  Further, in the inventions according to claims 1 and 9, since the distribution line having no branching load may be a newly established distribution line, the construction of the distribution line facility for responding to a new application from a large-scale customer is required. It can be implemented without affecting other customers and can respond quickly to new applications.

  On the other hand, according to the inventions described in claims 8 and 10, when a distribution line accident occurs, only the distribution line in which the distribution line accident has occurred can be automatically selected and blocked by the distribution line linking breaker. Therefore, the power supply can be stably continued by the loop operation with the remaining distribution lines, and high supply reliability can be obtained.

  Further, in the inventions according to claims 8 and 10, when the multiple loop includes an existing distribution line having a branch load, it is possible to improve the supply reliability of the existing distribution line as well as effectively use the existing facility.

  According to the present invention, the distribution line is formed into multiple loops, the voltage of the entire distribution line is evaluated based on voltage and current measurement information of a plurality of nodes in the distribution system, and the voltage adjustment of the distribution system is performed according to the evaluation result. By controlling the equipment, it is possible to supply power to the distribution system including large consumers that are larger than expected, and to maintain the voltage of the entire distribution line at an appropriate value, enabling stable distribution system operation. It is possible to provide a power distribution system operation system and a method thereof.

[First Embodiment]
[Constitution]
FIG. 1 is a configuration diagram showing a distribution system operation system according to a first embodiment to which the present invention is applied. In the distribution system operation system shown in FIG. 1, as an example, a case is shown in which a loop system is configured by multiplex-looping three distribution lines including a distribution line having a branch load and a distribution line having no branch load. . The feature of the configuration of the loop system in this embodiment is that a distribution line including a distribution line having a branch load and a distribution line having no branch load is made into multiple loops. A combination of distribution lines according to the presence or absence of a load can be freely selected.

  In the distribution system operation system shown in FIG. 1, the distribution system connects a plurality of distribution lines 3 a to 3 d to a distribution transformer 1 having a voltage adjustment function of a distribution substation via a distribution substation bus 2. Of these, the three distribution lines 3a to 3c are formed into multiple loops by the bus 4 of the loop system, and constitute a loop system.

  In the above and the following description, the subscript alphabet letters “a”, “b”, and “c” indicate the distribution lines constituting the loop system or the elements provided therein, separately for each line, “D” indicates a distribution line other than the loop system or an element provided therein. Further, these alphabetic letters of the subscripts are omitted as appropriate when it is not necessary to distinguish between individual distribution lines.

  Of the three lines of distribution lines 3a to 3c constituting the loop system, the two lines of distribution lines 3b and 3c have no branch load between the distribution substation bus 2 and the loop system bus 4 serving as a loop point. The remaining distribution line 3a is provided with a load line 5 serving as a branch load between the distribution substation bus 2 and the loop system bus 4 serving as a loop point. Specifically, the distribution lines 3b and 3c without the load line 5 can be, for example, newly installed distribution lines. These new distribution lines 3b and 3c and the existing distribution line 3a with the load line 5 can be used. A loop system can be configured with.

  In the figure, 6 is the impedance of the distribution line 3 constituting the loop system, and 7 is a circuit breaker of the distribution substation that connects the plurality of distribution lines 3 to the distribution substation bus 2. Reference numeral 8 denotes a circuit breaker that connects the distribution lines 3a to 3c constituting the loop system to the bus line 4 of the loop system. The circuit breaker 8 of the loop system measures physical quantities such as voltage and current of the distribution line 3. It has a measurement function.

  In the figure, reference numeral 9 denotes a voltage control device for controlling the voltage of each distribution line 3 and has a measurement function for measuring physical quantities such as voltage and current of each distribution line 3. In the figure, reference numeral 10 denotes a switch or circuit breaker having a measuring function for measuring the voltage, current, etc. of the line. As the specific voltage control device 9, for example, a step type automatic voltage regulator (SVR), a power capacitor (SC), a static reactive power compensator (SVC), or the like is used.

  In FIG. 1, as an example of the arrangement connection configuration of the voltage control device 9, each one voltage control device 9 a to 9 c is connected near the middle of each distribution line 3 a to 3 c constituting the loop system, and 1 A configuration in which another voltage control device 9a is connected to one end outside the loop of the distribution line 3a of the line is shown. The arrangement and connection configuration of the voltage control device 9 shown in FIG. 1 is merely an example, and other connection points of the voltage control device to each distribution line include, for example, a circuit breaker of a distribution substation. It can be freely connected to any point on the distribution line such as near or near the loop point.

  In the figure, 11 is a power receiving facility for large consumers. In addition, from the viewpoint of simplification of explanation, in the following explanation, it is abbreviated as “large customer 11” as appropriate. Reference numeral 12 denotes a switchgear for connecting the large customer 11 to the bus line 4 of the loop system, and 13 is a phase adjusting facility for improving the power factor of the large customer 11.

  In the figure, 14 is a current transformer (CT) of the distribution substation, 15 is a voltage transformer (VT) of the distribution substation, 16 is a voltage monitoring control device, and 17 is an impedance adjustment device provided in the distribution line 3. is there. In addition, in FIG. 1, although each impedance adjusting device 17a-17c is connected to the circuit breaker 7a vicinity of the distribution substation, this is only an example and the connection location of the impedance adjusting device with respect to each distribution line is as follows. In addition, for example, it is possible to freely connect to any point on the distribution line such as near the middle of the distribution line or near the loop point. In the figure, reference numeral 200 denotes a communication network, and 300 denotes an upper power system of a distribution substation.

  Note that the voltage monitoring control device 16, the distribution transformer 1, the circuit breaker 8, the voltage control device 9, the switch or circuit breaker 10, the current transformer 14, and the voltage transformer 15 are connected by a communication network 200, and are measured. Can send and receive values and control commands.

  Here, the voltage monitoring control device 16 determines the voltage of the entire distribution line of the distribution system based on the measurement information of the voltages and currents of a plurality of nodes of the distribution system and the line impedance and load information of the distribution line that is held in advance. Of the distribution system by controlling the voltage regulator (distribution transformer 1, voltage control device 9 etc.) installed in the distribution system when it is not within the proper range. It has a control function to control the voltage.

  Here, “node” is a term commonly used in the field of power distribution, such as a switch installation point, a voltage adjustment device installation point, a distribution line terminal point, etc. on the distribution system. Indicates the transition point.

  Specifically, the voltage monitoring control device 16 basically includes a storage device such as various memories, arithmetic processing hardware such as a CPU, an input / output device such as a keyboard and mouse, a display and a printer, a communication control device, and the like. It is comprised by the computer which has. The above-described control function of the voltage monitoring control device 16 is realized by a combination of arithmetic processing hardware such as a CPU basically included in the computer and a control program specialized for voltage monitoring control.

[Operation]
The outline of the normal operation of the power distribution system operation system according to the first embodiment as described above is as follows.

  First, at each of a plurality of nodes of a distribution system such as each device (breaker 8, voltage control device 9, switch or circuit breaker 10) having a measurement function, and a current transformer 14 and a voltage transformer 15 of a distribution substation. The voltage and current of the distribution system are measured every moment, and the measured values are transmitted to the voltage monitoring control device 16 via the communication network 200.

  The voltage monitoring control device 16 evaluates whether the voltage in the distribution system is an appropriate value by using the measured values of voltage and current collected from the entire distribution system. If it is an appropriate value, voltage monitoring of the distribution system is continued as it is. On the other hand, when it is not an appropriate value in the distribution system, the voltage monitoring control device 16 adjusts the voltage adjustment device of the distribution system, that is, the voltage adjustment in FIG. The control amount of the distribution transformer 1 having the function and the voltage control device 9 of each distribution line is calculated, and a control command including the calculated control amount is transmitted to the devices 1 and 9. The distribution transformer 1 and the voltage control device 9 that have received the control command perform voltage control according to the control command so that the voltage of the distribution system becomes an appropriate value.

  In addition, since the distribution line 3b and 3c do not have the load line 5 among the distribution lines which comprise a loop system, the line voltage in these distribution lines 3b and 3c may become an appropriate value in a large-volume consumer receiving end. There is no problem. Therefore, the control of the line voltage in the distribution lines 3b and 3c without these branch loads can be expanded with respect to the distribution line 3a with the branch loads. For example, the voltage monitoring control device 16 sets the appropriate voltage range in the control of the line voltage in these distribution lines 3b and 3c within the range of high voltage (600V <V ≦ The voltage is controlled as 7,000 V).

  Moreover, the impedance of each distribution line 3a-3c is equalized so that the load current of these distribution lines 3a-3c may be equalized by each impedance adjusting device 17a-17c provided in each distribution line 3a-3c which comprises a loop system | strain. Is adjusted. The impedance adjusting devices 17a to 17c are devices that adjust impedance by changing a resistance component or an inductance component, and are well-known techniques.

  FIG. 2 is a flowchart illustrating an example of a processing flow of the voltage monitoring control device 16 in the distribution system operation system according to the present embodiment as described above. As shown in FIG. 2, the voltage monitoring control device 16 first includes each device (breaker 8, voltage control device 9, switch or circuit breaker 10) having a measurement function, and a current transformer 14 of a distribution substation. The measured values of voltage and current measured every moment at a plurality of nodes of the distribution system such as the voltage transformer 15 are collected via the communication network 200 (S01).

  The voltage monitoring and control device 16 estimates the voltage distribution of the entire distribution line from the received voltage and current of the plurality of nodes of the distribution system and the line impedance and load information of the distribution line possessed in advance (S02), It is evaluated whether or not the voltage of the entire distribution line is within an appropriate range (S03). In this evaluation result, when there is a distribution line whose voltage deviates from the appropriate range (NO in S03), the voltage monitoring control device 16 calculates the control amount of the voltage control device 9 in the distribution line, and calculates the calculated control. The control command including the quantity is transmitted to the voltage control device 9 via the communication network 200 (S04). As a result, the voltage control device 9 that has received the control command performs voltage control according to the control command so that the voltage of the distribution system becomes an appropriate value.

  The voltage monitoring and control device 16 evaluates whether or not the voltage of the distribution line after the voltage control by the voltage control device 9 is performed within the appropriate range by transmitting the control command (S05). Is not in the proper range (NO in S05), the control command transmission (S04) and the distribution line voltage evaluation (S05) are repeated until the voltage control device 9 reaches the control limit (NO in S06).

  When the voltage does not fall within the proper range even when the voltage control device 9 reaches the control limit (YES in S06), the voltage monitoring control device 16 calculates the tap adjustment amount that is the control amount of the distribution transformer 1, A tap adjustment command including the tap adjustment amount is transmitted to the distribution transformer 1 via the communication network 200 (S07). As a result, the distribution transformer 1 that has received the tap adjustment command performs voltage control by tap adjustment so that the voltage of the distribution system becomes an appropriate value in accordance with the tap adjustment command.

  The voltage monitoring control device 16 repeats the series of processes (S01 to S07) as described above until the voltage of the entire distribution system falls within the proper range, and the time when the voltage of the entire distribution system falls within the proper range (YES in S02). Or, a series of processing (S01 to S07) is terminated in S05).

[effect]
According to the distribution system operation system according to the first embodiment as described above, the following effects can be obtained.

  First, by making the distribution line into a multiple loop, it is possible to secure a sufficient transmission capacity for a distribution system including a large-volume consumer more than the conventional assumption (for example, 4500 kVA or more). In addition, the voltage of the entire distribution line is controlled by evaluating the voltage of the entire distribution line based on the measurement information of the voltage and current of multiple nodes in the distribution system, and controlling the voltage regulator of the distribution system according to the evaluation result. Therefore, even if the demand fluctuation pattern of each distribution line is greatly different, it is possible to maintain the voltage of all distribution lines within the appropriate range compared to voltage control by the bus voltage batch adjustment method such as LDC method, Stable distribution system operation can be performed.

  In addition, when new distribution system facilities are installed for new large-volume customers, depending on the contracted capacity with the large-volume customers and the length of the distribution line from the distribution substation to the large-volume customers, It is advantageous to supply power by making a distribution loop of a voltage class lower than the voltage into multiple loops, so that the construction cost is reduced and the construction period is shortened.

  In particular, according to the present embodiment, a multiple loop including a distribution line having no branch load and a distribution line having a branch load is configured, and the appropriate range of the voltage of the distribution line having no branch load is expanded among the multiple loops. By controlling the voltage of the distribution system, the restrictions on the voltage control of the entire distribution system are relaxed.Therefore, the voltage adjustment of the entire distribution system can be adjusted compared to the case where only distribution lines with branch loads are made into multiple loops. It becomes easy.

  In addition, distribution lines that do not have branch loads may be newly established distribution lines, so the construction of distribution line facilities to respond to new applications from large-scale customers is carried out without affecting other customers. Yes, it can respond quickly to new applications.

  Furthermore, since the impedance adjusting device is provided for each distribution line constituting the loop system, it is possible to equalize the load current of the distribution line by adjusting the impedance of each distribution line by each impedance adjusting device.

[Modification of distribution line load current equalization]
In 1st Embodiment mentioned above, so that the load current of these distribution lines 3a-3c may be equalize | homogenized by each impedance adjustment apparatus 17a-17c provided in each distribution line 3a-3c which comprises a loop system | strain. The case where the technique of adjusting the impedance 6a-6c of each distribution line 3a-3c was applied was demonstrated. However, the impedance adjustment function for equalizing the load currents of the distribution lines constituting the loop system is not limited to the method using the impedance adjustment device, and can be realized by other methods.

  As one of the methods to realize the impedance adjustment function, impedance can be achieved by using multiple types of wires with different electrical specifications (wire resistance, inductance, ground capacitance, etc.) for the distribution lines that make up the loop system. An adjustment function may be realized. That is, in FIG. 1, you may adjust each impedance 6a-6c of each distribution line 3a-3c which comprises a loop by using several types of electric wire from which an electrical specification mutually differs. For example, a configuration is conceivable in which an aluminum wire is used as the wire that realizes the impedance 6a, and an overhead cable is used as the wire that realizes the impedances 6b and 6c.

  As another method for realizing the impedance adjustment function, the impedance adjustment function may be realized by using electric wires having different electrical specifications within the same distribution line constituting the loop system. FIG. 3 is a configuration diagram showing an example of a distribution system operation system when a plurality of types of electric wires having different electrical specifications are used in the same distribution line constituting the loop system as a modification of the first embodiment. In FIG. 3, reference numerals 18 and 19 denote electric wires having different electrical specifications. For example, by changing the wires at the intermediate point from the circuit breaker 7 of the distribution substation to the loop point, overhead cables are used for the wires 18a to 18c on the distribution substation side, and the wires 19a to 19c on the loop point side are used. A configuration using an aluminum electric wire is conceivable.

  In addition, when an overhead cable is used for the electric wire, since the ground capacitance becomes larger than that of an aluminum electric wire or the like, an improvement in the voltage maintaining effect can be expected. In addition, since the overhead cable has higher insulation than an aluminum electric wire or the like, there is an advantage that a plurality of lines can be easily laid on the same power pole.

  On the other hand, the method for equalizing the load current of the distribution lines that make up the loop system is not limited to the method that provides the impedance adjustment function, but the method that provides the phase adjustment function that adjusts the phase of the distribution line is adopted. Also good. FIG. 4 is a configuration diagram showing an example of a distribution system operation system when a phase adjusting device is connected to each distribution line constituting the loop system as a modification of the first embodiment. In FIG. 4, the phase adjusting devices 20a to 20c of the distribution lines 3a to 3c constituting the loop system are connected to the vicinity of the circuit breaker 7 of the distribution substation as an example, but this is merely an example. However, the connection part of the phase adjusting device for each distribution line can be freely connected to any point on the distribution line, for example, near the middle of the distribution line or near the loop point. The specific configuration of the phase adjustment device can be freely selected. For example, an existing system such as a phase shift adjustment transformer may be used.

[Variation of voltage control device arrangement]
In 1st Embodiment mentioned above, although it comprised so that each distribution line 3a-3c which comprises a loop system could provide the voltage control apparatus 9a-9c, respectively, and it was comprised so that line voltage could be controlled for every distribution line, this invention is Not only this but the structure as shown in FIG. 5 is also possible. Here, FIG. 5 is a configuration diagram illustrating an example of a distribution system operation system in the case where voltage control devices are provided only in some of the distribution lines configuring the loop system, as a modification of the first embodiment. That is, in FIG. 5, the voltage control device provided in the distribution line constituting the loop system is only one voltage control device 9a connected to one end outside the loop of the single distribution line 3a.

  The configuration of the loop system as shown in FIG. 5 can be applied to, for example, a system in which the line length from the distribution substation bus to the loop point is relatively short and the voltage is easily maintained. It is also possible to simplify the components by eliminating the voltage control device.

[Second Embodiment]
[Constitution]
FIG. 6 is a configuration diagram showing a distribution system operation system according to a second embodiment to which the present invention is applied. In the distribution system operation system shown in FIG. 6, as an example, a case is shown in which a three-line distribution line consisting only of distribution lines having a branch load is formed into a multiple loop to form a loop system.

  Since the basic configuration of the power distribution system operation system shown in FIG. 6 is the same as that of the system of the first embodiment shown in FIG. 1, only differences from the system of the first embodiment will be described below. . That is, in the distribution system operation system of the present embodiment, the difference from the first embodiment is that the first embodiment is a circuit breaker that connects the distribution lines 3a to 3c constituting the loop system to the bus 4 of the loop system. Instead of the circuit breakers 8a to 8c, circuit breakers 21a to 21c having not only a measurement function but also an accident determination function and a selective interruption function are used.

  Further, the load line 5 is connected to the three distribution lines 3a to 3c constituting the loop system, and the voltage control device provided on the distribution line constituting the loop system is a single distribution line. The difference from the first embodiment is that only one voltage control device 9a is connected to one end outside the loop 3a.

  In these interruption devices 21a to 21c, the accident determination function is a function for determining the presence or absence of a distribution line accident based on the measured values of voltage and current obtained by the measurement function, and the selective interruption function is a distribution line. This function selectively cuts off the distribution line that caused the accident. Specifically, the shut-off device 21 having such an accident determination function and a selective shut-off function specifically includes a computer and a circuit breaker that basically include a storage device, arithmetic processing hardware, an input / output device, a communication control device, and the like. Composed of a combination of mechanisms. The accident determination function and the selective cutoff function are realized by a combination of arithmetic processing hardware and a control program specialized for the cutoff device.

  Note that the feature of the configuration of the loop system in this embodiment is that the loop system is configured using not only a measurement function but also an interrupting device having an accident determination function and a selective blocking function. The number is freely selectable under certain conditions. Here, the fixed condition regarding the number of lines constituting the loop system means that when an accident occurs in any of the distribution lines in the loop system and the accident distribution line is cut off, the remaining distribution in the loop system. The condition is that the power supply can be continued by the loop operation of the electric wire. That is, as long as this condition is satisfied, the number of lines constituting the loop system can be freely selected.

[Operation]
The normal operation of the distribution system operation system according to the second embodiment as described above is the same as that of the system according to the first embodiment described above. However, in the distribution system operation system according to the present embodiment, a loop is performed. When a distribution line accident occurs in the system, a characteristic operation including detection and selective interruption of the accident distribution line is performed by the interruption device 21 having a measurement function and a selective interruption function. FIG. 7 is a flowchart showing an example of a processing flow of the shutoff device 21 in the distribution system operation system of the present embodiment.

  As shown in FIG. 7, in the event of a distribution line accident in the loop system, a distribution line accident is detected as a result of an accident determination based on the measured voltage / current by the interruption device 21 having a measurement function and a selective interruption function. (YES in S11 and S12), only the distribution line in which the accident has occurred is selectively cut off and a part of the loop configuration is eliminated (S13). In this case, power supply is continued by the loop operation by the remaining distribution lines in the loop system.

  After such selective interruption, when the accident distribution line recovers (YES in S14), the accident distribution line interruption device 21 recloses from the interruption state and returns the loop system to the original loop configuration (S15). . Note that the voltage monitoring control device 16 and each device connected to the voltage monitoring control device 16 through the communication network 200 operate in the same manner as normal after an accident occurs.

[effect]
According to the power distribution system operation system according to the second embodiment as described above, the following effects can be obtained.

  First, by making the distribution lines into multiple loops, it is possible to secure a sufficient transmission capacity for the distribution system including large customers than expected, and the distribution system based on the voltage of the entire distribution line. By controlling the voltage regulator, even if the demand fluctuation pattern of each distribution line is significantly different, the voltage of all distribution lines can be maintained within the appropriate range, and stable distribution system operation can be performed. This is the same as in the first embodiment.

  In addition, when installing new distribution system facilities for new large-scale customers, depending on the contracted capacity and the length of the distribution line, it is possible to supply power by distributing multiple distribution lines of voltage class lower than the conventional supply voltage. However, similar to the first embodiment, the construction cost can be reduced and the construction period can be shortened. Furthermore, the point which can equalize the load current of a distribution line by adjusting the impedance of each distribution line by each impedance adjustment apparatus provided in each distribution line which comprises a loop system also with 1st Embodiment. It is the same.

  In addition to the effects as described above, in particular, according to the present embodiment, when a distribution line accident occurs, only the distribution line in which the distribution line accident has occurred is automatically detected by the distribution line linking circuit breaker. Since it can be selectively cut off, the power supply can be continued stably by the loop operation with the remaining distribution lines, and the effect that high supply reliability is obtained can be obtained. Moreover, when the multiple loop includes an existing distribution line having a branch load, it is possible to improve the supply reliability of the existing distribution line as well as effectively use the existing facilities.

[Modification of distribution line load current equalization]
In the second embodiment described above, as a technique for realizing an impedance adjustment function for equalizing the load currents of the distribution lines constituting the loop system, each of the loop systems is configured in the same manner as in the first embodiment. Although the case where the method of providing the impedance adjusting devices 17a to 17c is applied to the distribution lines 3a to 3c has been shown, as a method for realizing the impedance adjusting function, other methods as shown in FIGS. 8 and 9 may be applied. Good.

  Here, FIG. 8 shows, as a modification of the second embodiment, a plurality of types of electric wires 18 and 19 (electric wires similar to FIG. 3) having different electrical specifications in the same distribution line constituting the loop system. It is a block diagram which shows an example of the power distribution system operation system at the time of using. In the modification shown in FIG. 8, a plurality of types of electric wires 18 and 19 are used only for the two distribution lines 3b and 3c among the three distribution lines 3a to 3c constituting the loop system. Such a configuration is, for example, an existing distribution line in which the distribution line 3a is composed of one type of electric wire, and the existing distribution line 3a and new distribution lines 3b and 3c using a plurality of types of electric wires. This is used when multiple loops are formed by linking with.

  Further, FIG. 9 shows another modification of the second embodiment, in which power distribution when phase adjusting devices 20a to 20c (phase adjusting devices similar to FIG. 4) are connected to the respective distribution lines constituting the loop system. It is a lineblock diagram showing an example of a system operation system.

[Other variations]
Furthermore, as another modified example, only the circuit breaker 8 is measured according to the second embodiment in the configuration of the first embodiment (FIG. 1) or the modified examples (FIGS. 3, 4, and 5). It is also possible to adopt a configuration that replaces the blocking device 21 having a function and a selective blocking function. According to such a modification, a synergistic effect of the effect of the first embodiment and the effect of the second embodiment can be obtained.

[Other Embodiments]
It should be noted that the present invention is not limited to the above-described embodiments, and various other variations can be implemented within the scope of the present invention. For example, the system configuration and processing flow shown in the drawings are merely examples, and the specific power distribution system configuration, loop system configuration, voltage monitoring control device and specific processing flow of the shut-off device, etc. can be changed as appropriate. .

The lineblock diagram showing the distribution system operation system concerning a 1st embodiment to which the present invention is applied. The flowchart which shows an example of the processing flow of the voltage monitoring control apparatus in the power distribution system operation system which concerns on 1st Embodiment. The block diagram which shows an example of the distribution system operation system at the time of using the multiple types of electric wire from which an electrical specification differs in the same distribution line which comprises a loop system as a modification of 1st Embodiment. The block diagram which shows an example of the power distribution system operation system at the time of connecting a phase adjustment apparatus to each distribution line which comprises a loop system as a modification of 1st Embodiment. The block diagram which shows an example of the power distribution system operation system at the time of providing a voltage control apparatus only in the one part distribution line which comprises a loop system as a modification of 1st Embodiment. The lineblock diagram showing the distribution system operation system concerning a 2nd embodiment to which the present invention is applied. The flowchart which shows an example of the processing flow of the interruption | blocking apparatus in the power distribution system operation system of 2nd Embodiment. The block diagram which shows an example of the distribution system operation system at the time of using the multiple types of electric wire from which an electrical specification differs in the same distribution line which comprises a loop system as a modification of 2nd Embodiment. The block diagram which shows an example of the distribution system operation system at the time of connecting a phase adjustment apparatus to each distribution line which comprises a loop system as another modification of 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Distribution transformer with voltage adjustment function 2 ... Distribution substation bus 3 ... Distribution line 4 ... Loop system bus 5 ... Load line 6 ... Impedance 7 ... Distribution substation breaker 8 ... Measurement function Circuit breaker 9 with loop system ... Voltage control device 10 with measurement function ... Switch or circuit breaker 11 with measurement function ... Large customers (power receiving equipment)
12 ... switchgear 13 ... phase adjusting equipment 14 ... current transformer (CT)
15 ... Voltage transformer (VT) of distribution substation
DESCRIPTION OF SYMBOLS 16 ... Voltage monitoring control apparatus 17 ... Impedance adjustment apparatus 18, 19 ... Electric wire 20 with different electrical specifications ... Phase adjustment apparatus 21 ... Loop system interruption | blocking apparatus provided with measurement function, accident determination function, and selection interruption | blocking function

Claims (10)

In the distribution system operation system that supplies power to the distribution system including large consumers,
A plurality of distribution lines of the distribution system, multiple loops configured by linking through distribution circuit link breakers provided in each distribution line;
Whether or not the voltage of the entire distribution line of the distribution system is within the appropriate range based on the measurement information of the voltage and current of the plurality of nodes of the distribution system and the line impedance and load information of the distribution line that is held in advance. A voltage monitoring control device for controlling the voltage of the distribution system by controlling the voltage regulator installed in the distribution system when it is not within the proper range,
The multiple loop includes a distribution line having no branch load and a distribution line having a branch load,
The voltage monitoring control device expands an appropriate voltage range of the distribution line having no branch load with respect to the distribution line having the branch load among the plurality of distribution lines constituting the multiplex loop. A power distribution system operation system configured to control voltage. The plurality of distribution lines constituting the multiplex loop have an impedance adjustment function for adjusting the impedance of the distribution lines or a phase adjustment function for adjusting the phase of the distribution lines so as to equalize the load currents of these distribution lines. The power distribution system operation system according to claim 1. The distribution system operation system according to claim 2, wherein the impedance adjustment function is realized by an impedance adjustment device connected to each distribution line configuring the multiple loop. The distribution system operation system according to claim 2, wherein the impedance adjustment function is realized by using a plurality of types of electric wires having different electrical specifications for the plurality of distribution wires constituting the multiple loop. The said impedance adjustment function is implement | achieved by using the multiple types of electric wire from which an electrical specification differs in the same distribution line which is each distribution line which comprises the said multiple loop. Power distribution system operation system. The distribution system operation system according to claim 2, wherein the phase adjustment function is realized by a phase adjustment device connected to each distribution line constituting the multiplex loop. The distribution system operation system according to claim 1, wherein a part or all of the plurality of distribution lines constituting the multiple loop is configured by an overhead cable. In the distribution system operation system that supplies power to the distribution system including large consumers,
A plurality of distribution lines of the distribution system, multiple loops configured by linking through distribution circuit link breakers provided in each distribution line;
Whether or not the voltage of the entire distribution line of the distribution system is within the appropriate range based on the measurement information of the voltage and current of the plurality of nodes of the distribution system and the line impedance and load information of the distribution line that is held in advance. A voltage monitoring control device for controlling the voltage of the distribution system by controlling the voltage regulator installed in the distribution system when it is not within the proper range,
Each circuit breaker for the distribution line linkage is a measurement function for measuring the amount of electricity in the distribution system, an accident determination function for determining the presence or absence of a distribution line accident, and a selective cutoff function for selectively blocking a distribution line in which a distribution line accident has occurred. Each is configured as a shut-off device,
Each of the disconnecting devices for linking the distribution line is determined based on the amount of electricity measured by the measurement function, and when the distribution determination is made by the accident determination function, the distribution line that has caused the distribution line accident is By selectively blocking with the selective blocking function, part or all of the multiplex loop is eliminated, and when the distribution line fault is recovered, the redistribution is performed and the distribution line is configured to multiplex loop again. Distribution system operation system characterized by that. In a distribution system operation method for supplying power to a distribution system including large consumers,
By linking a plurality of distribution lines of the distribution system via each distribution line link breaker provided on each distribution line, a multiple loop including a distribution line having no branch load and a distribution line having a branch load is provided. Configure
Based on voltage and current measurement information of a plurality of nodes of the distribution system and line impedance and load information of the distribution line that is held in advance, the voltage of the entire distribution line of the distribution system is Evaluate whether it is within the proper range, and if it is not within the proper range, control the voltage of the distribution system by controlling the voltage regulator installed in the distribution system,
When controlling the voltage of the distribution system by the voltage monitoring control device, among the plurality of distribution lines constituting the multiplex loop, the voltage of the distribution line without the branch load is compared with the distribution line with the branch load. A power distribution system operation method characterized by enlarging an appropriate range and controlling the voltage of the power distribution system. In a distribution system operation method for supplying power to a distribution system including large consumers,
By linking a plurality of distribution lines of the distribution system via each distribution line link breaker provided in each distribution line, a multiple loop is configured,
Based on voltage and current measurement information of a plurality of nodes of the distribution system and line impedance and load information of the distribution line that is held in advance, the voltage of the entire distribution line of the distribution system is Evaluate whether it is within the proper range, and if it is not within the proper range, control the voltage of the distribution system by controlling the voltage regulator installed in the distribution system,
Each circuit breaker for the distribution line linkage is a measurement function for measuring the amount of electricity in the distribution system, an accident determination function for determining the presence or absence of a distribution line accident, and a selective cutoff function for selectively blocking a distribution line in which a distribution line accident has occurred. Configured as a shut-off device each having
When it is determined that a distribution line accident has occurred by the accident determination function based on the amount of electricity measured by the measurement function by each of the distribution line linking device, the distribution line that has caused this distribution line accident is The selective cutoff function is used to selectively cut off part or all of the multiplex loop, and when the distribution line fault is recovered, the circuit is reclosed and the distribution line is made into a multiple loop again. Distribution system operation method.

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