JP5372124B2 - Distribution system management support apparatus, control method and program for distribution system management support apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform various measures for maintaining the voltage at each point of a distribution line within a specified voltage range more rationally. <P>SOLUTION: The power distribution system management support device for supporting management of voltage in a distribution line includes a measurement data acquisition unit for acquiring the measurement data including the voltage, current and power factor, every predetermined time, from a plurality of measurement instruments of the distribution line, a power calculation unit for calculating the power, consumed or generated in a section between the measurement instruments of the distribution line, on the basis of the measurement data, a power information storage unit for storing the calculation value of power in each section in association with the date information, a power distribution calculation unit for extracting the calculation value of power in each section at a date corresponding to predetermined conditions, and calculating a statistic value indicating the distribution state of power for each section, a voltage distribution calculation unit for calculating a statistic value indicating the distribution state of voltage at each point of the distribution line on the basis of the statistic value indicating the distribution state of power, and a voltage distribution output unit for outputting the statistic value indicating the distribution state of voltage. <P>COPYRIGHT: (C)2013,JPO&amp;INPIT

Description

  The present invention relates to a distribution system management support apparatus, a control method for a distribution system management support apparatus, and a program.

Electric power companies are making daily efforts to maintain and improve the quality of electric power provided to consumers. For example, in order to maintain the voltage of power provided to each customer within the specified range, the power company considers the voltage drop in the distribution line extending from the distribution substation and sends it at the substation. Adjustment of voltage, adjustment of transformation ratio in pole transformer, installation and adjustment of voltage regulators such as ShR (Shunt Reactor), SSR (Step Switched Reactor), and SSC (Step Switched Capacitor) are performed.
The voltage of such distribution lines varies greatly depending on various factors such as daily weather conditions and power demand, in addition to the length from the distribution substation and seasonal factors (summer, winter, long holidays, etc.) .
For this reason, every year, the power company considers the performance of the previous year, seasonal factors, weather forecasts, power demand forecasts, etc. A plan for the necessity of changing the transformer ratio is formulated and implemented.
Various technologies have been developed for managing the voltage of distribution lines (see, for example, Patent Document 1).

JP 2006-067675 A

  Since the voltage of power provided to consumers is stipulated by laws and regulations, when formulating the above plan, it will be provided to consumers no matter how the power demand or weather conditions change. It is necessary to prevent the power voltage from deviating from the specified voltage range.

  For this reason, the contents of the above measures are determined based on the maximum and minimum values of voltage fluctuations that have occurred in the past. Therefore, a large amount of various power facilities such as voltage regulators are installed, and Construction work for changing the transformer ratio is also increasing.

  Furthermore, in recent years, with the spread of various private power generation facilities, including power generation facilities that use natural energy such as solar power generation and wind power generation, various distributed power sources have been introduced into the distribution lines. Difficulty in expanding fluctuation ranges and predicting voltage fluctuations is increasing.

  Therefore, in developing various measures to maintain the voltage at each point on the distribution line within the specified voltage range, it is not simply based on the maximum and minimum values of past voltage fluctuations. There is a need for a technology that can statistically analyze the distribution situation and formulate the contents of measures more rationally.

  The present invention has been made in view of the above problems, and a distribution system management support apparatus and a distribution system management support apparatus that support the formulation of measures for maintaining the voltage at each point of the distribution line within the specified voltage range. One object is to provide a method and a program.

  A distribution system management support apparatus according to one aspect is a distribution system management support apparatus that supports the management of voltage in a distribution line extending from a distribution substation, and a plurality of measuring instruments arranged on the distribution line From the measurement data acquisition unit that acquires measurement data including voltage, current, and power factor every predetermined time, and the power consumed or generated in the section sandwiched by the measuring instrument in the distribution line A power calculation unit that calculates based on the measurement data respectively acquired from the measuring device, and a power information storage unit that stores the calculated value of the power in each section of the distribution line in association with information indicating date and time; The calculated power value of each section at the date and time corresponding to a predetermined condition is extracted from the power information storage unit for each section, and a statistical value indicating the distribution status of the power for each section is obtained. A power distribution calculation unit that outputs, a voltage distribution calculation unit that calculates a statistical value indicating a voltage distribution state at each point of the distribution line, based on a statistical value indicating a distribution state of the power calculated for each section; And a voltage distribution output unit that outputs a statistical value indicating the voltage distribution state.

  In addition, the problems disclosed by the present application and the solutions thereof will be clarified by the description in the column of the embodiment for carrying out the invention and the description of the drawings.

  When formulating various measures for maintaining the voltage at each point of the distribution line within the specified voltage range, it becomes possible to formulate the measure contents more rationally.

It is a whole lineblock diagram of a distribution system control system. It is a block diagram which shows a power distribution system management assistance apparatus. It is a figure which shows a memory | storage device. It is a figure which shows a measurement data storage table. It is a figure which shows a section electric power storage table. It is a figure which shows the section electric power storage table according to a condition. It is a figure which shows the system voltage storage table according to a condition. It is a figure which shows a weather information storage table. It is a figure which shows a transformation ratio management table. It is a flowchart which shows a measurement data acquisition process. It is a flowchart which shows the system voltage calculation process according to a condition. It is a flowchart which shows a system voltage determination process. It is a figure which shows the voltage of a distribution line. It is a figure which shows a mode that the voltage of a distribution line deviates from a regulation range. It is a figure which shows a mode that the voltage sent from a distribution substation is changed and the voltage of a distribution line is settled in a regulation range.

  At least the following matters will become apparent from the description of this specification and the accompanying drawings.

=== Example of Overall Configuration ===
An overall configuration of a power distribution system control system 1000 including the power distribution system management support apparatus 100 according to the present embodiment is shown in FIG.

<Distribution system control system>
The distribution system control system 1000 according to the present embodiment includes a transformer 200, a high-voltage bus 210, a circuit breaker 230, a distribution line 220, a switch 240 with a measurement function, a switch 250, and a distribution system management support device. 100.

<Transformers, high voltage busbars, circuit breakers>
The transformer 200, the high voltage bus 210, and the circuit breaker 230 are devices installed in the distribution substation.

  The transformer 200 is a device that receives electric power transmitted from a transmission line (not shown), converts the electric power into electric power of a predetermined high voltage (for example, 6600 volts, hereinafter also referred to as a sending voltage), and outputs the electric power. The transmission voltage of the transformer 200 can be set by performing a predetermined setting operation on the transformer 200. Moreover, the transformer 200 can switch the output voltage to a predetermined set value and output it at a predetermined date and time. For example, the transformer 200 outputs a higher transmission voltage when the power demand increases, such as during the daytime in summer, and outputs a lower transmission voltage when the power demand decreases, such as during the night in spring or autumn. To do.

  The high voltage bus 210 is a power transmission path for supplying power output from the transformer 200 to the circuit breaker 230.

  The circuit breaker 230 outputs the electric power output from the transformer 200 to the distribution line 220. A plurality of circuit breakers 230 are provided in the distribution substation, and the power output from the transformer 200 is output to the plurality of distribution lines 220 via each circuit breaker 230.

<Distribution lines, switches with measuring function, switches>
The distribution line 220 is an electric power transmission path for supplying the electric power output from the circuit breaker 230 to the electric power consumer. The electric power output from the circuit breaker 230 is converted into low-voltage (for example, rated 100 volts) electric power at each point on the distribution line 220 by a pole transformer (not shown) installed on a power pole or the like. Supplied to each consumer.

  The voltage on the route of the distribution line 220 tends to decrease as the distance from the circuit breaker 230 increases due to the influence of the impedance of the distribution line 220 itself and various loads on the route. . Therefore, the transformation ratio in each pole transformer is adjusted so that the secondary voltage supplied to the consumer falls within the specified voltage range defined by laws and regulations. This prescribed voltage range is defined as 101 volts ± 6 volts (95 volts to 107 volts) when the rated voltage is 100 volts.

  In FIG. 1, it is shown that the transformation ratio of the pole transformer is changed at the points A260 and B260 of the distribution line 220. Although details will be described later, in the following description, a section from the circuit breaker 230 to the point A260 is referred to as a 6600 tap section, a section from the point A260 to the point B260 is referred to as a 6450 tap section, and a section after the point B260 is referred to as a 6300 tap section. .

  As described above, the voltage of the distribution line 220 is the impedance existing in the distribution line 220, the operating status of each customer facility, the weather conditions, the season, the reverse power flow from various private power generation devices such as solar power generation facilities, etc. It changes variously under the influence. Therefore, every year, the electric power company adjusts the voltage sent from the distribution substation, adjusts the transformation ratio of the pole transformer, and installs a voltage regulator (ShR, SSR, etc.) on the route of the distribution line 220. In order to maintain the voltage provided to the consumer, the power system is controlled according to the execution plan.

  Next, at each point on the route of the distribution line 220, for example, a switch 240 with a measurement function and a switch 250 are installed on a utility pole. The switch 240 with the measurement function and the switch 250 have a function of cutting off the current flowing through the distribution line 220. In addition to the function as the switch 250, the switch 240 with a measurement function has a function of measuring the current, voltage, power factor, and the like of the distribution line 220 and outputting measurement data obtained by the measurement.

  As will be described in detail later, in this embodiment, each switch 240 with a measurement function is communicably connected to the distribution system management support apparatus 100 via the communication network 300. And the switch 240 with the measurement function of each point transmits the electric current, voltage, power factor, etc. in a measurement point to the distribution system management support apparatus 100 as measurement data.

  In the example illustrated in FIG. 1, a state in which the switch 240 with a measurement function is installed at the point 10, the point 20, and the point 30 is illustrated.

<Distribution system management support device>
The distribution system management support apparatus 100 acquires measurement data such as current, voltage, and power factor at each measurement point from the switch 240 with a measurement function installed at each point of the distribution line 220 at each predetermined time. It is a computer for statistically analyzing the distribution of voltage that varies with time at a point.

  The configuration of the distribution system management support apparatus 100 will be described with reference to the hardware configuration diagram shown in FIG. Moreover, the program and table for implement | achieving each function of the power distribution system management assistance apparatus 100 are shown in FIGS.

  The distribution system management support apparatus 100 includes a CPU (Central Processing Unit) 110, a memory 120, a communication I / F (interface) 130, a storage device 140, an input I / F 150, and an output I / F 160. Further, the power distribution system management support apparatus 100 is connected to the recording medium reading apparatus 190.

  The CPU 110 is responsible for overall control of the power distribution system management support apparatus 100, and by reading the power distribution system management support program 600 stored in the storage device 140 into the memory 120 and executing it, various kinds of functions as the power distribution system management support apparatus 100 are performed. Realize the function.

  The recording medium reading device 240 is a device for reading and writing programs and data recorded on the recording medium 800. The read program and data are stored in the memory 120 and the storage device 140.

  As the recording medium 800, a flexible disk, a magnetic tape, a magneto-optical disk, a semiconductor memory, or the like can be used.

  The input I / F 150 is connected to the input device 170. The input device 170 is a device used for inputting data to the distribution system management support device 100 by an operator or the like, and functions as a user interface. For example, a keyboard or a mouse can be used as the input device 170.

  The output I / F 160 is connected to the output device 180. The output device 180 is a device for outputting information to the outside and functions as a user interface. For example, a display or a printer can be used as the output device 180.

  The communication I / F 130 is a device for performing communication. The communication I / F 130 is connected to the switch 240 with a measurement function via the network 300, for example, and receives measurement data such as the voltage, current, and power factor of the distribution line 220 measured by the switch 240 with the measurement function. Further, the communication I / F 130 may be communicably connected to another computer via the network 300.

  The storage device 140 is constituted by a hard disk device, for example. As shown in FIG. 3, the storage device 140 has a distribution system management support program 600, a measurement data storage table 700, a section power storage table (power information storage unit) 710, a section power storage table 720 according to a situation, and a system voltage storage according to a situation. A table 730, a weather information storage table 740, and a transformation ratio management table 750 are stored. Each of these tables will be described in detail in the following description.

=== Flow of processing ===
Next, the flow of processing executed by the power distribution system management support apparatus 100 according to the present embodiment will be described in detail according to the flowcharts shown in FIGS.

<Measurement data acquisition process>
First, measurement data acquisition processing performed by the distribution system management support apparatus 100 will be described with reference to FIG.

  The distribution system management support apparatus 100 monitors whether or not a predetermined measurement data acquisition time has arrived (S1000). In the present embodiment, the distribution system management support apparatus 100 sends a measurement data acquisition request to each switch 240 with a measurement function connected to the network 300 periodically (for example, every hour at 0 and 30 minutes). Send. And each switch 240 with a measurement function measures the various values including the voltage in the distribution line 220, an electric current, and a power factor according to this acquisition request. Each switch 240 with a measurement function transmits measurement data including voltage, current, and power factor to the distribution system management support apparatus 100. The distribution system management support apparatus 100 receives the measurement data transmitted from each switch 240 with a measurement function (S1010).

  The measurement data transmitted from each switch 240 with a measurement function includes, for example, the switch 240 with a measurement function in addition to the voltage, current, and power factor of the distribution line 220 measured by the switch 240 with a measurement function. Information indicating the installation point (hereinafter also referred to as point information), information indicating the measurement date and time, and the like may be included.

  Next, the distribution system management support apparatus 100 records the measurement data acquired from each switch 240 with a measurement function in the measurement data storage table 700 in association with information indicating the acquisition date and point information (S1020). FIG. 4 shows how these pieces of information are stored in the measurement data storage table 700.

  As illustrated in FIG. 4, the measurement data storage table 700 includes information indicating the date and time when the measurement data acquired by the distribution system management support apparatus 100 from the switch 240 with the measurement function is acquired (for example, month, day, day, and time). Are stored in association with each other. As shown in FIG. 4, the distribution system management support apparatus 100 according to the present embodiment acquires measurement data from the switch 240 with a measurement function every 30 minutes.

  Returning to FIG. 10, the power distribution system management support apparatus 100 is sandwiched between the switches 240 with the measurement function based on the respective measurement data acquired from the switch 240 with the measurement function adjacent to the distribution line 220. The active power P and reactive power Q consumed or generated in the section are calculated (S1030).

  The power distribution system management support apparatus 100 calculates active power P and reactive power Q for all sections sandwiched between adjacent switch 240 with a measurement function in the distribution line 220, information indicating the acquisition date and time of measurement data, and It is recorded in the section power storage table 710 in association with identification information indicating the section (hereinafter also referred to as section information) (S1040). The section information is generated based on, for example, point information at points at both ends of the section (for example, section information of a section sandwiched between the points 10 and 20 is referred to as a section 12). FIG. 5 shows how these pieces of information are recorded in the section power storage table 710.

  The section power storage table 710 stores active power P (kVA) and reactive power Q (kvar) consumed or generated between adjacent points (sections) on the distribution line 220 in association with information indicating the date and time. .

  The active power P and the reactive power Q in each section can be calculated based on the measurement data storage table 700 by acquiring measurement data of voltage, current, and power factor at two adjacent points.

  And when the outflow power is smaller than the inflow power into the section, the consumed power is larger than the newly generated power in the section, and the power is consumed as the total in the section. It will be.

  In addition, when the outflow power is larger than the inflow power into the section, the newly generated power is larger than the power consumed in the section, and the total new power in the section Is generated. For example, when a large-scale photovoltaic power generation facility or the like is installed in the section, the power generated by the photovoltaic power generation facility flows into the distribution line 220, so that power flows into the section. The amount of power that flows out is greater than that.

  In addition, the switch 240 with a measurement function which pinches | interposes a section does not necessarily need to be adjacent. For example, a section 13 may be formed between the point 10 and the point 30, and the active power P (kVA) consumed or generated in the section 13 and the reactive power Q (kvar) may be calculated.

<System voltage calculation processing by situation>
Next, a situation-specific system voltage calculation process performed by the distribution system management support apparatus 100 will be described with reference to FIG.

  The situation-specific system voltage calculation process extracts data of date and time corresponding to a predetermined condition from the active power P and reactive power Q of each section stored in the section power storage table 710 shown in FIG. In this process, statistical values indicating the distribution status of the data are obtained, and further, statistical values indicating the voltage distribution status at each point of the distribution line 220 are obtained from these statistical values.

  When specifying the predetermined condition, it is possible to specify a combination of date and time, for example, “between 1 July and 15:00 every day from July 1 to September 30”. For example, the day of the week, the weather (sunny weather, rain, cloudy, snow, fog, etc.), temperature (for example, the maximum temperature is 35 ° C. or more, etc.), the region (the region from point 10 to point 40) can be specified in various ways. It is.

  The distribution system management support apparatus 100 first receives information specifying the predetermined condition from the input apparatus 170 (S2000).

  Then, the distribution system management support apparatus 100 refers to the section power storage table 710 and extracts data (active power P and reactive power Q in each section) associated with the date and time information corresponding to the above conditions (S2010). .

  In addition, when the designation | designated conditions include designation | designated by weather, designation | designated by temperature, etc., the power distribution system management assistance apparatus 100 refers to the weather information storage table 740 shown in FIG. After specifying the date and time corresponding to the weather and temperature, the section power storage table 710 is referenced to extract data associated with the date and time information corresponding to the condition.

  As shown in FIG. 8, the weather information storage table 740 is a table that records weather data such as weather and temperature observed every predetermined time every day. These meteorological data may be acquired from another computer (not shown) connected via the network 300, or the network 300 may be connected from a meteorological observation device (not shown) that observes these meteorological data. You may make it acquire via.

  Returning to FIG. 11, when the distribution system management support apparatus 100 extracts from the section power storage table 710 the active power P and the reactive power Q corresponding to the above conditions, the active power P and the reactive power Q are extracted. A statistical value indicating the distribution status of each value is obtained for each section (S2020).

  Various values such as average value, standard deviation, variance, maximum value, minimum value, mode value, and median value can be adopted as statistical values indicating the distribution status of each value. By using a quantity indicating the degree of variation such as deviation, the significance of each value of active power P and reactive power Q distributed in each section under the specified conditions can be easily understood from a probabilistic viewpoint. Is possible. This facilitates the determination of the necessity of each measure after considering the power fluctuations at each point of the distribution line 220 from a probabilistic viewpoint, for example, when examining various measures for the distribution system. Is possible.

  When the distribution system management support apparatus 100 obtains a statistical value indicating the distribution state of each value of the active power P and the reactive power Q in each section, the values of some of the active power P and the reactive power Q in the section are determined. In the case of having a value far from other values (for example, a predetermined value or more), the statistical value may be calculated after removing some of these values. In this way, for example, it is possible to remove the influence of an emergency such as a power failure that temporarily occurred in the area in the section from the statistical value, and it is possible to obtain a more reliable statistical value. Become.

  The distribution system management support apparatus 100 records the statistical value calculated as described above in the section-specific power storage table 720 (S2030).

  An example of the situation-specific section power storage table 720 is shown in FIG. The section power storage table 720 according to the situation is a table in which statistical values indicating the distribution state of the active power P and the reactive power Q in each section are recorded.

  In the example shown in FIG. 6, the average value and standard deviation of the active power P and the reactive power Q in each section from 10:00 to 15:00 every day from July to August are recorded, and from July to August The average value and standard deviation of active power P and reactive power Q in each section from 15:00 to 18:00 every day are also recorded.

  Next, the distribution system management support apparatus 100 determines the voltage at each point of the distribution line 220 based on the statistical value indicating the distribution status of the active power P and the reactive power Q of each section recorded in the section-specific power storage table 720. A statistical value indicating the distribution status is calculated (S2040).

  The distribution system management support apparatus 100 can obtain the voltage distribution state at each point by performing the power flow calculation based on the active power P, the reactive power Q in each section of the distribution line 220, and the load in each section.

  The tidal current calculation is, for example, a simultaneous linear equation with the average value and standard deviation of the voltage at each point as unknown variables, the average value of active power P and the average value of reactive power Q in each section, and installed in each section. It can be performed by solving the load using various electric power facilities.

  In this way, the distribution system management support apparatus 100 can obtain the average value and standard deviation of the voltage at each point of the distribution line 220, that is, the statistical value indicating the voltage distribution state. Then, the distribution system management support apparatus 100 stores the statistical value indicating the distribution state of the voltage at each point of the distribution line 220 in the system-specific system voltage storage table 730 (S2050).

  An example of the system voltage storage table 730 for each situation is shown in FIG. The situation-specific system voltage storage table 730 is a table in which statistical values indicating the distribution situation of the voltage V at each point of the distribution line 220 are recorded.

  In the example shown in FIG. 7, the average value and standard deviation of the voltage V at each point from 10:00 to 15:00 every day from July to August are recorded, and from 15:00 to 18 every day from July to August. The average value and standard deviation of the voltage V at each point at the time are also recorded in the system voltage storage table 730 for each situation.

  As described above, when the average value and standard deviation of the voltage V at each point of the distribution line 220 are recorded in the system voltage storage table 730 according to the situation, various measures for the distribution system are examined. In addition, by referring to these data, it is possible to determine the necessity of each measure in consideration of the voltage fluctuation at each point of the distribution line 220 from a probabilistic viewpoint.

  The distribution system management support apparatus 100 can output the data recorded in the system voltage storage table 730 according to the situation in various formats. For example, the power distribution system management support apparatus 100 can output the numerical data recorded in the system voltage storage table 730 according to the situation to an output device 180 such as a printer or a monitor, or to another computer that is communicably connected. It can also be sent.

  Alternatively, for example, as shown in FIG. 13, the distribution system management support apparatus 100 has a system voltage for each situation on a two-dimensional plane in which the horizontal axis is the distance (length) from the distribution substation and the vertical axis is the voltage. A graph is generated by plotting the average value and standard deviation of the voltage at each point of the distribution line 220 stored in the storage table 730, and is output from the output device 180 or transmitted to another computer. You can also

  In the graph shown in FIG. 13, the solid line is a line connecting the average values of the voltages at each point, and the dotted line is a line connecting the addition value and the subtraction value between the average value and the standard deviation.

  By using such a graph format, it becomes possible to easily examine the voltage fluctuation at each point of the distribution line 220 from a probabilistic viewpoint.

<System voltage judgment processing>
Next, system voltage determination processing performed by the distribution system management support apparatus 100 will be described with reference to FIG. The system voltage determination process is a process of determining whether or not the voltage at each point of the distribution line 220 deviates from the allowable range.

  First, the distribution system management support apparatus 100 reads a statistical value indicating the distribution state of the voltage V at each point of the distribution line 220 from the system-specific system voltage storage table 730 (S3000).

  In addition, the power distribution system management device 100 reads the transformation ratio set for the pole transformer arranged at each point from the transformation ratio management table 750 (S3010).

  An example of the transformation ratio management table 750 is shown in FIG. The transformation ratio management table 750 is a table that records the transformation ratio set in the pole transformer installed at each point of the distribution line 220.

  In the example shown in FIG. 9, the pole transformer installed on the substation side (6600 tap section shown in FIG. 1) from the point A260 indicates that the transformation ratio for transforming 6600 volts to 101 volts is set. . Moreover, the pole transformer installed between the point A260 and the point B260 (the 6450 tap section shown in FIG. 1) indicates that a transformation ratio for transforming 6450 volts to 101 volts is set.

  In this case, for example, if the fluctuation range of the voltage of the distribution line 220 on the substation side from the point A260 is 6208 volts to 6992 volts, the voltage output from the secondary side of the pole transformer on the substation side from the point A260 is Since it falls within the range of 95 volts to 107 volts, the voltage provided to the consumer can be kept within the standards (101 volts ± 6 volts) defined by laws and regulations. Therefore, on the substation side from the point A260, the allowable voltage range of the distribution line 220 is 6208 volts to 6992 volts.

  Similarly, if the voltage fluctuation range of the distribution line 220 between point A260 and point B260 is 6067 volts to 6833 volts, the voltage output from the secondary side of the pole transformer between point A260 and point B260. Can be in the range of 95 volts to 107 volts. Accordingly, the allowable range of the voltage of the distribution line 220 is between 6067 volts and 6833 volts between the points A260 and B260.

  Note that the allowable voltage range of the distribution line 220 is not only calculated based on the legal reference range (for example, 101 volts ± 6 volts), but also stricter than the legal reference range (for example, 101 volts ± 4 volts). It is also possible to calculate based on

  Next, the distribution system management support apparatus 100 determines whether or not the voltage fluctuation range at each point of the distribution line 220 deviates from the allowable range (S3020). This determination can be made based on whether or not the added value and the subtracted value of the average value of the voltage at each point and the standard deviation are within the allowable range of the voltage at each point.

  When the voltage fluctuation range of the distribution line 220 does not deviate from the allowable range at all points on the distribution line 220, the process proceeds to "NO" in S3030 and outputs that no deviation occurs (S3040).

  On the other hand, if the voltage fluctuation range of the distribution line 220 deviates from the allowable range at any point, the process proceeds to “Yes” in S3030. Then, the power distribution system management support apparatus 100 calculates the deviation amount at the point where the deviation occurs. If the sum of the average value of the voltage at the point where the deviation occurs and the standard deviation exceeds the upper limit of the allowable voltage range at that point, the difference between the above-mentioned additional value and the upper limit is deviated. Calculate as a quantity. If the subtraction value between the average value of the voltage at the point where the deviation occurs and the standard deviation is less than the lower limit value of the allowable voltage range at the point, the difference between the subtraction value and the lower limit value Is calculated as the deviation amount.

  FIG. 14 shows a state in which it is determined whether the voltage fluctuation range at each point of the distribution line 220 deviates from the allowable range at each point. In FIG. 14, the solid line shown in a staircase pattern indicates the upper limit value and the lower limit value of the allowable range of voltage at each point. The two broken lines represent the voltage fluctuation range at each point, and the solid line between the two broken lines represents the average value of the voltage at each point. The voltage fluctuation range is obtained from a value obtained by adding a standard deviation or the like to a voltage average value and a value obtained by subtraction.

  The voltage fluctuation range is not only a range of values obtained by adding or subtracting standard deviation to the average value of voltage, but also a value obtained by multiplying the average value of voltage by a predetermined number of times (for example, twice). It can also be a range of values obtained by addition / subtraction.

  In the example shown in FIG. 14, at a certain point, the value obtained by subtracting the standard deviation or the like from the average value of the voltage at that point is below the lower limit value of the allowable voltage range. It is shown that the deviation amount is Vd volts.

  Returning to FIG. 12, when such a deviation occurs, the distribution system management support apparatus 100 proceeds to “Yes” in S3030 to calculate the deviation amount (S3050), and information or deviation indicating that the deviation occurs. Outputs information such as where the error occurs and the amount of deviation (S3060).

  This makes it possible to determine the necessity of each measure after considering the fluctuation of the voltage at each point of the distribution line 220 from a probabilistic viewpoint when examining various measures for the distribution system. .

  Furthermore, when the distribution system management support apparatus 100 according to the present embodiment detects that a voltage deviation occurs as described above, it can also simulate the effect of a measure for eliminating the voltage deviation.

  In this case, the distribution system management support apparatus 100 changes the substation transmission voltage (for example, the value estimated from the above deviation amount), and the active power of each section recorded in the section power storage table 720 according to the situation. Then, the average value and standard deviation of the voltage at each point are calculated from the reactive power (S3070, S3080).

  Then, the distribution system management support apparatus 100 uses the average value of the voltage at each point after the change, the standard deviation, and the like, and the voltage fluctuation range at each point of the distribution line 220 again deviates from the allowable voltage range. It is determined whether or not to perform (S3090).

  If no deviation occurs, the process proceeds to “NO” in S3100 and outputs that the countermeasure can be taken by changing the transmission voltage at the distribution substation by the change amount Vd (deviation amount) (S3110). FIG. 15 shows a situation in which countermeasures are taken by changing the transmission voltage V0 at the distribution substation by the deviation Vd.

  As shown in FIG. 15, by changing the transmission voltage V0 at the distribution substation to V0 + Vd, the voltage fluctuation range at each point of the distribution line 220 can be kept within the allowable voltage range. Here, the transmission voltage is changed by the deviation amount Vd. However, since the transmission voltage to be changed does not necessarily match the deviation amount, the distribution system management support apparatus 100 sets the range of the transmission voltage that can eliminate the deviation. It may be calculated.

  On the other hand, if the transmission voltage of the distribution substation is changed and a new departure occurs at another point, the process proceeds to “NO” in S3100, and the distribution system management support apparatus 100 determines the departure. Outputs that the deviation should be resolved by the individual response at each point where the error occurs (S3120). As measures in this case, for example, individually changing the transformation ratio of the pole transformer at the departure point or installing a voltage regulator (ShR or SSR) on the distribution line 220 near the departure point. is assumed.

  Although the present embodiment has been described above, according to the distribution system management support apparatus 100 according to the present embodiment, when formulating various measures for maintaining the voltage at each point of the distribution line 220 within the specified voltage range, It becomes possible to formulate the contents of measures more rationally. In particular, when examining the contents of various measures for the power distribution system, it becomes possible to determine the necessity of each measure after considering the voltage fluctuation at each point of the distribution line 220 from a probabilistic viewpoint.

  In addition, the operating status of large-scale customers such as factories, the temperature, the power generation status by the solar power generation device, and the like greatly fluctuate the voltage of the distribution line 220. Since the fluctuation range of the voltage of the distribution line 220 is calculated using data extracted by specifying various conditions such as date, day of the week, and weather, the fluctuation range of the voltage at each point of the distribution line 220 is calculated. , Can be determined accurately according to each situation.

  In addition, when calculating the voltage fluctuation range at each point of the distribution line 220, the calculation is performed in consideration of the active power P and reactive power Q consumed or generated by the distribution line 220. It is also possible to accurately reflect the influence of capacitive components and inductive components of various power consumption devices such as motors and power generation devices.

  Although the present embodiment has been described above, the above-described embodiment of the present invention is intended to facilitate understanding of the present invention and is not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and equivalents thereof are also included in the present invention.

100 Power Distribution System Management Support Device 110 CPU
120 Memory 130 Communication I / F
140 Storage device 150 Input I / F
160 Output I / F
170 Input Device 180 Output Device 190 Recording Medium Reading Device 200 Transformer 210 High Voltage Bus 220 Distribution Line 230 Breaker 240 Switch with Measurement Function 250 Switch 260 Tap Change Point 300 Communication Network 600 Distribution System Management Support Program 700 Measurement Data Storage Table 710 Section power storage table 720 Situation-specific section power storage table 730 Situation-specific system voltage storage table 740 Weather information storage table 750 Transform ratio management table 760 Situation classification definition table 800 Recording medium 1000 Distribution system control system

Claims (8)

A distribution system management support device that supports voltage management in a distribution line extending from a distribution substation,
From a plurality of measuring instruments arranged on the distribution line, a measurement data acquisition unit that acquires measurement data including voltage, current, and power factor every predetermined time;
A power calculator that calculates power consumed or generated in a section sandwiched between the measuring devices in the distribution line based on the measurement data respectively acquired from the measuring devices sandwiching the section;
A power information storage unit for storing the calculated value of the power in each section of the distribution line in association with information indicating date and time;
The calculated power value of each section at the date and time corresponding to a predetermined condition is extracted from the power information storage unit for each section, and the power for calculating the statistical value indicating the power distribution status for each section A distribution calculator;
Based on a statistical value indicating the distribution status of the power calculated for each section, a voltage distribution calculation unit that calculates a statistical value indicating a voltage distribution status at each point of the distribution line;
A voltage distribution output unit that outputs a statistical value indicating the voltage distribution state;
A distribution system management support apparatus comprising: The distribution system management support device according to claim 1,
The statistical value indicating the power distribution state includes an average value of the power and an amount indicating the degree of variation of the power,
The distribution system management support apparatus, wherein the statistical value indicating the voltage distribution state includes an average value of the voltage and an amount indicating a degree of variation of the voltage. The distribution system management support device according to claim 2,
For each point of the distribution line, an added value and a subtracted value of the average value of the voltage and an amount indicating the degree of variation in the voltage are determined so that the voltage supplied to the consumer falls within a specified range. A determination unit that determines whether the voltage of the distribution line is within an allowable range;
A determination result output unit for outputting the result of the determination;
The distribution system management support apparatus further comprising: The distribution system management support device according to claim 3,
The determination unit, when the addition value or the subtraction value deviates from the allowable range of the voltage of the distribution line, calculates a deviation amount from the allowable range of the addition value or the subtraction value,
The determination result output unit outputs the deviation amount. A distribution system management support apparatus according to any one of claims 1 to 4,
The distribution system management support apparatus characterized in that the power consumed or generated in each section calculated by the power calculation unit includes active power and reactive power consumed or generated in each section.   A distribution system management support apparatus according to any one of claims 1 to 5,
  When the weather condition is included in the predetermined condition, the power distribution calculation unit refers to the weather data observed every predetermined time, identifies the date and time corresponding to the weather condition, A calculated value of power in each section at a date and time corresponding to a predetermined condition is extracted from the power information storage unit for each section, and a statistical value indicating the distribution status of the power is calculated for each section.
A distribution system management support device characterized by that. A control method of a distribution system management support device that supports voltage management in a distribution line extending from a distribution substation,
The distribution system management support device acquires measurement data including voltage, current, and power factor every predetermined time from a plurality of measuring instruments arranged on the distribution line,
The power distribution system management support device calculates the power consumed or generated in the section sandwiched by the measuring instrument in the distribution line based on the measurement data respectively acquired from the measuring instrument sandwiching the section,
The distribution system management support device stores the calculated value of the power in each section of the distribution line in a power information storage unit in association with information indicating date and time,
The distribution system management support device extracts the calculated value of the power at the date and time corresponding to a predetermined condition from the power information storage unit for each section,
The distribution system management support device calculates, for each section, a statistical value indicating the distribution status of the power,
The distribution system management support device calculates a statistical value indicating a voltage distribution state at each point of the distribution line based on the statistical value of the power in each section,
The distribution system management support apparatus outputs a statistical value indicating a distribution state of the voltage, and controls the distribution system management support apparatus. In the distribution system management support device that supports the voltage management in the distribution line extending from the distribution substation,
A procedure for acquiring measurement data including voltage, current, and power factor at predetermined intervals from a plurality of measuring instruments arranged on the distribution line;
A procedure for calculating the power consumed or generated in the section sandwiched by the measuring instrument in the distribution line based on the measurement data respectively acquired from the measuring instrument sandwiching the section;
A procedure for storing the calculated value of the power in each section of the distribution line in a power information storage unit in association with information indicating date and time,
A procedure for extracting the calculated value of the power at the date and time corresponding to a predetermined condition from the power information storage unit for each section;
A procedure for calculating a statistical value indicating the distribution status of the power for each section;
A procedure for calculating a statistical value indicating a voltage distribution state at each point of the distribution line based on the statistical value of the power in each section;
A procedure for outputting a statistical value indicating the distribution state of the voltage;
A program that executes

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