JP5578940B2 - Voltage control device - Google Patents

Description

  The present invention relates to a voltage control device that adjusts the voltage of a distribution system.

  Currently, as voltage control devices used in distribution systems, for example, LRT (Load Ratio control Transformer) installed in substations, and SVR (Step Voltage Regulator: automatic stepping) installed on distribution lines Voltage regulators such as voltage regulators are known. These voltage regulators have a voltage regulating transformer, and by changing the transformation ratio by changing the tap position (tap value) of the transformer, the voltage on the load side (secondary voltage) ) To control.

  As a typical tap position switching method, the tap position (transformation ratio) is based on the calculated value obtained from the measured value of the passing power or passing current of the voltage regulator and the measured value of the secondary voltage of the voltage regulator. There are an LDC (Line Drop Compensator) method for switching between and a schedule method for switching to a predetermined tap position at a predetermined time.

  For example, in the SVR LDC system, a voltage control target point called a “load center point” that is separated from the SVR is virtually assumed. Then, the self-end voltage Vs, the self-end pass active power P, and the self-end pass reactive power Q are measured and substituted into the following equation (1) in the SVR, so that the voltage Vc at the load center point away from the SVR is obtained. Is estimated.

  In this equation (1), the line resistance R and the line reactance X from the SVR to the load center point are preset constants, which are a so-called “settling value (control parameter)”. In patent document 1, the voltage distribution of a power distribution system is estimated by the analysis using a system simulator etc., and the settling value is determined based on the result. Further, in Patent Document 2, the LRT LDC method is simulated using current / voltage measured in a distribution system, and a settling value is calculated. However, in the calculation method, combinations of various set values are designated by the user, simulation is performed for each combination, and a set value set with the best voltage distribution is selected based on the simulation result.

JP 2000-69668 A JP 2008-228428 A

  In the LDC voltage control apparatus as described above, since the tap position of the SVR is changed so that the estimated voltage at the load center point is within the operation range, the settling value for obtaining the estimated voltage is set correctly. Otherwise, an error occurs in the estimated voltage at the load center point, and the actual voltage of the distribution system may deviate from the specified upper and lower limits. That is, how properly the set value is set is a difference between whether or not the voltage of the distribution system is properly maintained.

  Here, in the voltage control apparatus in which the user performs system analysis simulation as in the technique described in Patent Document 1, since the actual load distribution is not measured in detail, the user accurately determines the load distribution in the distribution system. Need to be estimated. However, as distributed power sources such as photovoltaic power generation become widespread, the distribution of voltage in the distribution system has become diverse, making it difficult to estimate and analyze all of them. In addition, since the load distribution of the actual power distribution system changes from moment to moment, the set value set by the user is often not realistic.

  Therefore, the present invention has been made in view of the above-described problems, and a technique capable of accurately estimating the voltage to be adjusted without the user setting the set value of the voltage control device. The purpose is to provide.

A voltage control device according to the present invention is a voltage control device that adjusts a measurement point voltage, which is a voltage at a predetermined measurement point of a distribution system, and is a voltage adjustment transformer electrically connected to the predetermined measurement point. A measuring device for measuring the self-end voltage, self-passing active power and self-passing reactive power in the transformer, and the measurement point voltage, the self-end voltage, and the self-end, which are measured at a plurality of time points. A measurement database for storing measurement data including passing active power and the self-passing reactive power. Then, by performing a multiple regression analysis on the measurement data stored in the measurement database, a voltage drop from the own end voltage to the measurement point voltage, the own end passing active power, and the own end passing reactive power A regression analysis unit that calculates a correlation coefficient with the control unit, and a control execution unit that controls the voltage of the transformer. The control execution unit controls the voltage of the transformer so that the measurement point voltage is within an operation range when the measurement point voltage is obtained, and when the measurement point voltage is not obtained, Obtaining an estimated value of the measurement point voltage based on the self-end voltage, self-passing active power, self-passing reactive power, and correlation coefficient measured by a measuring instrument, and the estimated value is within an operating range. The voltage of the transformer is controlled so as to be within the range. The voltage control device obtains a plurality of measured values of the measurement point voltage and a plurality of estimated values corresponding to the measured values, and performs predetermined processing from statistical processing of errors between the plurality of measured values and the estimated values. An error estimation unit for obtaining an error, wherein the error estimation unit sets a value obtained by subtracting the predetermined error from the upper limit value of the operation range as an upper limit value of a target range in which the estimated value is to be stored; A value obtained by adding the predetermined error from the lower limit value of the operation range is set as the lower limit value of the target range.

  According to the present invention, when the measurement point voltage V cannot be obtained, the correlation coefficient for estimating the measurement point voltage is automatically obtained. This eliminates the need for the user to estimate the correlation coefficient. Further, since the correlation coefficient is a value obtained from the measurement data, it changes following the change of the distribution system. Therefore, even if the power distribution system changes, the measurement point voltage to be adjusted can be accurately estimated.

1 is a block diagram illustrating a configuration of a voltage control device according to a first embodiment and its periphery. 3 is a flowchart showing an operation of the voltage control apparatus according to the first embodiment. FIG. 3 is a diagram illustrating an operation of the voltage control device according to the first embodiment. 3 is a flowchart showing an operation of the voltage control apparatus according to the first embodiment. 3 is a flowchart showing an operation of the voltage control apparatus according to the first embodiment. It is a block diagram which shows the voltage control apparatus which concerns on Embodiment 3, and the structure of the periphery. It is a block diagram which shows the voltage control apparatus which concerns on Embodiment 4, and the structure of the periphery. 10 is a flowchart showing the operation of the voltage control apparatus according to the fourth embodiment. FIG. 10 is a diagram illustrating an operation of the voltage control device according to the fourth embodiment. FIG. 10 is a diagram illustrating an operation of the voltage control device according to the fourth embodiment.

<Embodiment 1>
FIG. 1 is a block diagram showing a configuration of a voltage control apparatus according to the present embodiment and its periphery. As shown in the figure, the voltage control device 1 includes a voltage / power measuring instrument 10, a data collection unit 11, a measurement database 12, a regression analysis unit 13, a control parameter storage unit 14, a control execution unit 15, And a voltage adjusting transformer 16.

The voltage control device 1 is provided with a distribution line 20 across the inside and outside. A transformer 16 is connected to the distribution line 20 inside the voltage control device 1, and a plurality of voltage sensors PT _OUT are provided on the distribution line 20 outside the voltage control device 1. A plurality of voltage measuring instrument 18 is connected to a plurality of voltage sensors PT _OUT. Then, each voltage measuring instrument 18 measures the measurement point voltage at the measurement point the voltage sensor PT _OUT is provided.

  In general, a supply voltage from a voltage supply source (not shown) decreases as it passes through the wiring line, so that the supply voltage becomes low at a remote location of the voltage supply source. Therefore, voltage control devices such as LRT and SVR suppress the supply voltage from being lowered in a remote place by controlling the voltage generated in its own transformer. In the present embodiment, the voltage control apparatus 1 allows the supply voltage to be measured by making the measurement point voltage measured at the measurement point existing within the compensation range of the distribution system fall within the operation range set by the user. Is suppressed.

  In the following description, a measurement point existing within the compensation range is referred to as a “compensation point”, and the measurement point voltage is referred to as a “compensation point voltage”. In the following description, it is assumed that there are a plurality of compensation points, and an arbitrary compensation point among the plurality of compensation points may be expressed as i (= 1, 2,...). May be written as V (i).

  In the present embodiment, the voltage measuring instrument 18 that measures the compensation point voltage V (i) has a communication function. The voltage measuring device 18 can transmit the compensation point voltage V (i) measured by itself to the voltage control device 1 via the communication line 19.

The voltage / power meter 10 measures the self-end voltage Vs, the self-end passing active power P, and the self-end pass reactive power Q in the transformer 16. In this embodiment, the voltage sensor PT _IN and power sensors CT, is provided from the transformer 16 in the voltage control device 1 to the distribution line 20 on the secondary side (compensation point side). The voltage / power measuring instrument 10 is connected to the voltage sensor PT _IN and the power sensor CT, and the voltage, active power and reactive power at the location where these are provided are the self-end voltage Vs, the self-end pass active power P and Measured as self-passing reactive power Q. Hereinafter, for the sake of simplicity, the self-passing effective power P and the self-passing reactive power Q may be collectively referred to as “self-passing powers P and Q”.

  The data collection unit 11 collects the compensation point voltage V (i) for each compensation point i from the plurality of voltage measuring devices 18 via the communication line 19 in a plurality of time sections (a plurality of time points). And the data collection part 11 also collects the self-end voltage Vs and self-end passing electric power P and Q from the voltage and electric power measuring device 10 in the cross section of the same multiple time. The data collection unit 11 outputs measurement data including the compensation point voltage V (i), the self-end voltage Vs, and the self-end passing powers P and Q collected in the cross section for a plurality of times to the measurement database 12.

  The measurement database 12 stores measurement data including the compensation point voltage V (i), the self-end voltage Vs, and the self-end passing electric powers P and Q collected (measured) on a plurality of cross sections within a certain period.

  The regression analysis unit 13 performs a multiple regression analysis on the measurement data of a plurality of time sections stored in the measurement database 12, thereby causing a voltage drop (voltage difference) from the local voltage Vs to the compensation point voltage V (i), A settling value (control parameter) that is a correlation coefficient with the self-passing powers P and Q is calculated for each compensation point. Then, the regression analysis unit 13 outputs the calculated settling value to the control parameter storage unit 14.

  The control parameter storage unit 14 stores the settling value output from the regression analysis unit 13.

  In the normal time when the compensation point voltage V (i) is normally measured and collected, the control execution unit 15 applies a voltage to the transformer 16 so that the compensation point voltage V (i) falls within the operation range. Issue up command or voltage down command.

  In addition, the control execution unit 15 determines the self-end voltage Vsn and the self-end passing powers Pn and Qn measured by the voltage / power meter 10 when the compensation point voltage V (i) is not normally measured and collected. Based on the set value stored in the control parameter storage unit 14, the estimated value Vn (i) of the compensation point voltage V (i) is estimated. The self-end voltage Vsn and the self-end passing powers Pn and Qn merely represent values used in the control execution unit 15, and are the same values as the self-end voltage Vs and the self-end passing powers P and Q. It is. The control execution unit 15 issues a voltage increase command or a voltage decrease command to the transformer 16 so that the estimated value Vn (i) falls within the operation range.

  The transformer 16 is electrically connected to the compensation point, and controls the tap position based on the voltage increase command and the voltage decrease command issued from the control execution unit 15, so that the secondary distribution line 20 The supplied voltage, that is, the compensation point voltage V (i) is controlled.

  Next, operations of the data collection unit 11, the regression analysis unit 13, and the control execution unit 15 will be described.

  FIG. 2 is a flowchart showing the operation of the data collection unit 11. First, the operation of the data collection unit 11 will be described. The data collection unit 11 is activated with a short period of about 1 minute to several tens of minutes. In the present embodiment, it is assumed that the data collection unit 11 is activated at a cycle of 1 minute.

  When the data collection unit 11 is activated, it collects measured values of the self-end voltage Vs, the self-end passing power P and Q, and the compensation point voltage V (i) in step s1. In step s2, the data collection unit 11 adds the current date / day / day information shown in FIG. 3 to the set of measurement values, so that the set of measurement values and date / day of the week information in one time section are displayed. Generate measurement data including The day of the week information may be divided into seven from Sunday to Saturday, or may be divided into two, weekdays and holidays, as shown in FIG. In step s3, the data collection unit 11 registers the measurement data in the measurement database 12 and ends.

  Since the operations in steps s1 to s3 as described above are repeated in the normal time section, the measurement data of the time section is stored in the measurement database 12.

  FIG. 4 is a flowchart showing the operation of the regression analysis unit 13. Next, the operation of the regression analysis unit 13 will be described with reference to FIG. The regression analysis unit 13 is activated for a long period of time from one day to one month. In the present embodiment, it is assumed that the regression analysis unit 13 is activated at a cycle of one day.

  When activated, the regression analysis unit 13 determines whether there is an unprocessed compensation point for which multiple regression analysis has not been completed in step s11. If it is determined in step s11 that there is an unprocessed compensation point, the process proceeds to step s12, and if not, the process ends.

  In step s12, the regression analysis unit 13 focuses on unprocessed compensation points. Note that, when returning from step s13 to step s11 to be described later and performing step s12 again, attention is paid to compensation points other than the compensation points focused on earlier among the unprocessed compensation points. In the following description, it is assumed that a compensation point of i = j is focused.

  In step s13, the regression analysis unit 13 determines whether there is an unprocessed time zone in which multiple regression analysis is not performed among the time zones divided by the date / time / day-of-week information regarding the compensation point j of interest. to decide. The time zone may be divided for each day of the week as described above, or may be divided every hour from midnight, or in the morning (from 6 to 8 o'clock) according to the general lifestyle of people. ), Daytime (from 8:00 to 17:00), evening (from 17:00 to 23:00), night (from 23:00 to 6:00 on the next day), and the like. Or you may classify | categorize for every month from January to December, and may classify | categorize for every season like spring, summer, autumn, and winter.

  If it is determined in step s13 that there is an unprocessed time zone, the process proceeds to step s14, and if not, the process returns to step s11.

  In step s14, the regression analysis unit 13 focuses on an unprocessed time zone in which the multiple regression analysis is not completed. In step s15, the regression analysis unit 13 acquires a plurality of measurement data corresponding to an unprocessed time zone among the measurement data of the past certain period stored in the measurement database 12. The past certain period may be, for example, a period from the present one month to five years.

  In step s16, the regression analysis unit 13 substitutes the plurality of measurement data in the same time zone acquired in step s15 into the following equation (2) for each time section, thereby calculating the compensation point voltage from the local voltage Vs. A voltage drop ΔV (j) up to V (j) is calculated for each time section.

  In each time section of the same time zone, it is assumed that there is a correlation as shown in the following formula (3) between the voltage drop ΔV (j) and the self-end passing powers P and Q. Therefore, in step s17, the regression analysis unit 13 performs multiple regression analysis on the voltage drop ΔV (j) and the self-passing powers P and Q in the plurality of time sections, thereby setting values k1 (j) and k2 (j ) Is calculated. That is, the regression analysis unit 13 sets the set values k1 (j) and k2 () such that the following expression (3) is substantially established between the voltage drop ΔV (j) and the self-passing powers P and Q in each time section. j) is calculated.

  In step s18, the regression analysis unit 13 stores the set values k1 (j) and k2 (j) as the result of the multiple regression analysis, that is, the control parameters in the control parameter storage unit 14. Thereafter, the process proceeds to step s13. By performing the loop processing including step s11 and step s13 as described above, settling values k1 (i) and k2 (i) are obtained for all the compensation points and time zones and stored in the control parameter storage unit 14. Is done.

  FIG. 5 is a flowchart showing the operation of the control execution unit 15 at the time of abnormality. The control execution unit 15 may shift from a normal operation to an abnormal operation when one compensation point voltage V (i) cannot be acquired, or the compensation point voltage V (i) When a predetermined number or more cannot be acquired, the normal operation may be shifted to the normal operation. Hereinafter, the operation at the time of abnormality of the control execution part 15 is demonstrated using FIG. Note that the control execution unit 15 is activated in a short cycle of several tens of milliseconds to several minutes at the time of abnormality. In the present embodiment, it is assumed that the control execution unit 15 is activated at a cycle of 1 second.

  When the control execution unit 15 is activated, in step s21, the self-end voltage Vsn and the self-end passing power Pn, Qn measured by the voltage / power meter 10 are acquired.

  In step s22, the control execution unit 15 determines whether there is an unprocessed compensation point from which the estimated value Vn (i) has not been acquired among the plurality of compensation points. If it is determined in step s22 that there is an unprocessed compensation point, the process proceeds to step s23, and if not, the process ends.

  In step s23, the control execution unit 15 focuses on an unprocessed compensation point. When returning from step s28, which will be described later, to step s22 and performing step s23 again, attention is paid to compensation points other than the previously focused compensation points among the unprocessed compensation points. In the following description, it is assumed that the compensation point of i = j1 is focused.

  In step s24, the control execution unit 15 acquires the settling values k1 (j1) and k2 (j1) of the time zone corresponding to the current time from the control parameter storage unit 14 with respect to the compensation point j1. In step s25, the control execution unit 15 obtains the self-end voltage Vsn, the self-end passing power Pn, Qn, and the set values k1 (j1), k2 (j1) acquired from the control parameter storage unit 14 by the following formula ( By substituting into 4), an estimated value Vn (j1) of the compensation point voltage V (j1) is calculated.

  Since the settling values k1 (j1) and k2 (j1) in the equation (4) can substantially satisfy the above-described equation (3), the estimated value Vn (j1) is substantially equal to the compensation point voltage V (j1). Will match.

  In step s26, control execution unit 15 determines whether or not estimated value Vn (j1) is larger than upper limit value Vmax of the operation range. If it is determined in step s26 that the estimated value Vn (j1) is larger than the upper limit value Vmax of the operation range, the process proceeds to step s27, and if not, the process proceeds to step s28.

  In step s27, the control execution unit 15 instructs the transformer 16 to reduce the voltage. When the transformer 16 lowers the voltage, the self-end voltage Vsn and the self-end passing power Pn, Qn are lowered as a whole. Therefore, an estimated value Vn (j1) that substantially matches the actual compensation point voltage V (j1) The upper limit value Vmax of the operation range can be set. After step s27, the process ends.

  In step s28, the control execution unit 15 determines whether the estimated value Vn (j1) is smaller than the lower limit value Vmin of the operation range. If it is determined in step s28 that the estimated value Vn (j1) is smaller than the lower limit value Vmin of the operation range, the process proceeds to step s29, and if not, the process returns to step s22.

  In step s29, the control execution unit 15 instructs the transformer 16 to increase the voltage. When the voltage of the transformer 16 increases, the self-end voltage Vsn and the self-end passing power Pn, Qn increase as a whole, and therefore, an estimated value Vn (j1) that substantially matches the actual compensation point voltage V (j1) The lower limit value Vmin of the operation range can be set. After step s29, the process ends.

  In the above operation, if the control execution unit 15 repeatedly performs the loop process including steps s22 to s26 and s28, the estimated value Vn (i) is obtained for all the compensation points. it can. In this case, all the obtained estimated values Vn (i) are within the operation range.

  On the other hand, for example, when the control execution unit 15 proceeds to step s27 or s29 in the process according to FIG. 5 for a certain compensation point j2 before estimating the estimated value Vn (i) of all the compensation points, The process ends without obtaining the estimated value Vn (i) for the subsequent compensation points. However, since the estimated value Vn (j2) of the compensation point j2 is likely to be within the operating range by the operation of step s27 or step s29, in that state, the control execution unit again after the next 1 second. When 15 is activated, in the process according to FIG. 5 for the estimated value Vn (j2), it is considered that the process returns from step s28 to step s22. Accordingly, the same processing is performed at the compensation points after the compensation point j2, so that all estimated values Vn (i) can be within the operation range.

  Here, the flow shown in FIG. 5 is performed for all the compensation points i regardless of whether or not the compensation point voltage V (i) as an actual measurement value has been acquired. It is not a thing. For example, the normal operation is performed for the compensation point for which the compensation point voltage V (i) can be obtained, and the flow shown in FIG. 5 is performed for the compensation point for which the compensation point voltage V (i) cannot be obtained. It may be a combination of both, as is done.

  According to the voltage control apparatus 1 according to the present embodiment as described above, when the compensation point voltage V (i) cannot be obtained, the settling value k1 (i) for estimating the compensation point voltage V (i). ), K2 (i) is automatically obtained. This eliminates the need for the user to estimate the settling values k1 (i) and k2 (i). Moreover, since the set values k1 (i) and k2 (i) are values obtained from the measurement data, they change following the change of the distribution system. Therefore, even if the distribution system changes, the compensation point voltage V (i) to be adjusted can be accurately estimated.

  Further, in the present embodiment, when the compensation point voltage V (i) is estimated, the settling values k1 (i) and k2 (i) in that time zone are used, and therefore the compensation point voltage V (i) is calculated. It can be estimated more accurately.

  In this embodiment, a plurality of compensation points i (= 1, 2,...) Exist. However, the present invention is not limited to this, and only one compensation point exists. Also good.

<Embodiment 2>
In the first embodiment, settling values k1 (i) and k2 (i) are obtained using the self-end passing powers P and Q, and the estimated value Vn (i) is obtained using the self-end passing powers Pn and Qn. . In the present embodiment, the self-end passing currents I and In can be used as substitutes for the self-end passing powers P, Q, Pn, and Qn. Hereinafter, the voltage control apparatus 1 according to the present embodiment will be described.

  The block configuration of the voltage control apparatus 1 according to the present embodiment is the same as the block configuration of the voltage control apparatus 1 according to the first embodiment shown in FIG. Hereinafter, with respect to the voltage control device 1 according to the present embodiment, the same reference numerals are given to portions common to the voltage control device 1 according to the first embodiment, and differences from the first embodiment will be mainly described below.

  Voltage / power meter 10 according to the present embodiment measures self-end passing current I instead of self-end passing power P and Q in transformer 16.

  The data collection unit 11 includes the own-end passing current I in the measurement data instead of the own-end passing electric powers P and Q, and outputs the measurement data to the measurement database 12. It is assumed that there is a correlation as shown in the following equation (5) between the voltage drop ΔV (j) and the self-passing current I. Therefore, the regression analysis unit 13 performs a multiple regression analysis on the measurement data stored in the measurement database 12, thereby setting the set value k3 (which is a correlation coefficient between the voltage drop ΔV (i) and the self-passing current I). i) is calculated for each compensation point. Then, the regression analysis unit 13 stores the calculated set value k3 (i) in the measurement database 12.

  The control execution unit 15 includes a self-end voltage Vsn, a self-end passing current In measured by the voltage / power meter 10 and a control parameter storage unit 14 when the compensation point voltage V (i) is abnormally measured and collected. The estimated value Vn (i) of the compensation point voltage V (i) is obtained by substituting the settling value k3 (i) stored in the equation (6) into the following equation (6). Note that the self-end voltage Vsn and the self-end passing current In merely represent values used in the control execution unit 15 and are the same values as the self-end voltage Vs and the self-end passing current I.

  The control execution unit 15 issues a voltage increase command or a voltage decrease command to the transformer 16 so that the estimated value Vn (i) obtained by Expression (6) is within the operation range.

  According to the voltage control apparatus 1 according to the present embodiment as described above, although the estimation accuracy of the compensation point voltage V (i) is inferior to that of the first embodiment, the burden of calculation processing can be reduced. Further, similarly to the first embodiment, the user does not need to estimate the settling value k3 (i), and the compensation point voltage V (i) can be accurately estimated even if the distribution system changes. .

<Embodiment 3>
FIG. 6 is a block diagram showing the configuration of the voltage control device 1a according to the present embodiment and its periphery. In the voltage control device 1a according to the present embodiment, parts that are the same as those of the voltage control device 1 according to the first embodiment are denoted by the same reference numerals, and will be described below with a focus on differences from the first embodiment. .

  As shown in FIG. 6, the voltage control device 1 a according to the present embodiment includes a voltage control execution unit 31 and a voltage control data processing unit 32 that are separated from each other.

  The voltage control execution unit 31 is provided in the power distribution system, that is, in the field, and includes the voltage / power meter 10, the control execution unit 15, the voltage adjustment transformer 16, the parameter reception unit 39, and the above-described control. Similar to the parameter storage unit 14, a control parameter storage unit 40 for storing the set values k1 (i) and k2 (i) is mounted. The voltage control execution unit 31 has a function of executing voltage control of the transformer 16.

  The voltage control data processing unit 32 is a central processing unit such as a computer having a communication function, for example, a computer, and includes a data collection unit 11, a measurement database 12, a regression analysis unit 13, and the control parameter storage unit 14 described above. Similarly, a control parameter storage unit 35 for storing the set values k1 (i) and k2 (i) and a parameter transmission unit 36 are mounted. The voltage control data processing unit 32 has a function of calculating set values k1 (i) and k2 (i) for the voltage control execution unit 31 to execute voltage control by performing data processing on the measurement data.

  The voltage / power measuring device 10 of the voltage control execution unit 31, the data collection unit 11 of the voltage control data processing unit 32, and the plurality of voltage measuring devices 18 are connected to each other via an upstream communication line 19a. . The parameter reception unit 39 of the voltage control execution unit 31 and the parameter transmission unit 36 of the voltage control data processing unit 32 are connected to each other via a downlink communication line 19b. In FIG. 6, the uplink communication line 19a and the downlink communication line 19b are different from each other. However, the present invention is not limited to this, and the same communication line may be used.

  The voltage control execution unit 31 periodically transmits the self-end voltage Vs and self-end passing powers P and Q measured by the voltage / power meter 10 to the data collection unit 11 via the communication line 19a. Since the data collection unit 11 periodically stores the self-end voltage Vs and the self-end passing powers P and Q transmitted from the voltage control execution unit 31 in the measurement database 12 as in the first embodiment, The voltage Vs and the self-passing powers P and Q are periodically uploaded from the voltage / power meter 10 to the measurement database 12 via the communication line 19a and the data collection unit 11.

  Similar to the first embodiment, the regression analysis unit 12 of the voltage control data processing unit 32 obtains the set values k1 (i) and k2 (i) from the measurement data stored in the measurement database, and the control parameter storage unit 35 Memorize regularly. The parameter transmission unit 36 is activated in the same cycle as the regression analysis unit 13, and sets the set values k1 (i) and k2 (i) stored in the control parameter storage unit 35 via the communication line 19b. 31 is periodically transmitted to the parameter receiving unit 39. The parameter receiving unit 39 receives the set values k1 (i) and k2 (i) from the parameter transmitting unit 36 and periodically stores them in the control parameter storage unit 40. Then, the control execution unit 15 obtains the estimated value Vn (i) of the compensation point voltage V (i) using the set values k1 (i) and k2 (i) stored in the control parameter storage unit 40.

  From the above, the settling values k1 (i) and k2 (i) are obtained from the regression analysis unit 13, the control parameter storage unit 35, the parameter transmission unit 36, the communication line 19b, the parameter reception unit 39, and the control parameter storage unit 40. And periodically downloaded to the control execution unit 15.

  According to the voltage control device 1a according to the present embodiment as described above, since data collection, storage, and analysis with a large calculation processing burden are performed on the computer, the overall cost of the voltage control device 1a can be reduced. it can.

  Although the case where the present embodiment is applied to the first embodiment has been described above, the present embodiment may be similarly applied to the second embodiment.

<Embodiment 4>
In the above embodiment, the estimated value Vn (i) is within the operating range, but there is some error between the compensation point voltage V (i) and the estimated value Vn (i). Therefore, even if the estimated value Vn (i) is within the operating range, the actual compensation point voltage V (i) rarely goes out of the operating range. Therefore, in the present embodiment, the actual compensation point voltage V (i) is obtained by acquiring an appropriate target range narrower than the operation range and keeping the estimated value Vn (i) within the target range. It is restrained from going out of the operational range.

  FIG. 7 is a block diagram showing the configuration of the voltage control device according to the present embodiment and its periphery. In addition, about the voltage control apparatus 1 which concerns on this Embodiment, the same code | symbol is attached | subjected about the part which is common with the voltage control apparatus 1 which concerns on Embodiment 1. FIG. As shown in the figure, the voltage control apparatus 1 according to the present embodiment is obtained by adding an error estimation unit 50 to the voltage control apparatus 1 according to the first embodiment.

  The error estimation unit 50 is generated between the compensation point voltage V (i) and the estimated value Vn (i) from the error between the actually measured compensation point voltage V (i) and the estimated value Vn (i). Is obtained (hereinafter referred to as “assumed error”), and based on the assumed error, a range obtaining process is performed for obtaining a target range in which the estimated value Vn (i) is to be stored.

  FIG. 8 is a flowchart showing the operation of the error estimation unit 50. The error estimation unit 50 is started after the regression analysis unit 13 is started in the same cycle as the regression analysis unit 13. In the present embodiment, it is assumed that the error estimation unit 50 is activated at a daily cycle.

  When the error estimation unit 50 is activated, it determines in step s31 whether there is an unprocessed compensation point for which the range acquisition process has not been completed. If it is determined in step s31 that there is an unprocessed compensation point, the process proceeds to step s32, and if not, the process ends.

  In step s32, the error estimation unit 50 focuses on an unprocessed compensation point. When step s32 is performed again from step s33, which will be described later, and step s32 is performed again, attention is paid to compensation points other than the compensation points focused on earlier among the unprocessed compensation points. In the following description, it is assumed that a compensation point of i = m is focused.

  In step s33, the error estimation unit 50 determines whether there is an unprocessed time zone in which the range acquisition process is not performed among the time zones divided by the date / time / day-of-week information regarding the compensation point m of interest. to decide. If it is determined in step s33 that there is an unprocessed time zone, the process proceeds to step s34, and if not, the process returns to step s31.

  In step s34, the error estimation unit 50 focuses on an unprocessed time zone in which the range acquisition process is not performed. In step s35, the error estimation unit 50 acquires the unprocessed time zone set values k1 (m) and k2 (m) from the control parameter storage unit 14 for the compensation point m. In step s36, the error estimation unit 50 includes a plurality of self-end voltages Vs and a plurality of self-ends corresponding to unacquired time zones among the measurement data stored in the measurement database 12 within a predetermined past period. Pass powers P and Q are acquired. The past fixed period is determined by the user.

  In step s37, the error estimator 50 calculates step s25 (FIG. 5) from the acquired settling values k1 (m) and k2 (m), the plurality of self-end voltages Vs, and the plurality of self-end passing powers P and Q. Similarly, the estimated value Vn (m) of the compensation point voltage V (m) is calculated for each time section.

  In parallel with these, in step s38, the error estimation unit 50 includes a plurality of compensation point voltages V (corresponding to the unacquired same time period within the above-described past certain period stored in the measurement database 12. m).

  In step s39, the error estimator 50 uses the difference between the plurality of compensation point voltages V (m), which are a plurality of actually measured values, and the plurality of estimated values Vn (m) corresponding thereto as an estimation error as a time cross section. Ask for each.

  FIG. 9 shows the probability distribution of the estimation error of the multiple time section obtained in this way. As shown in this figure, the estimation error has a high probability of occurrence at its average value, and has a low probability of occurrence at a value far from the average value. The estimation error may be a value in the range of the average value −2σ (σ is the standard deviation of the estimation error) to the average value + 2σ, but the possibility of becoming a value in the other range is very zero. It is close. In other words, from a statistical viewpoint, the possibility that the assumed error is “average value + 2σ” or more is very close to zero.

  Therefore, in step s40, the error estimation unit 50 performs a statistical process for calculating the average value and standard deviation σ of the estimation errors of the plurality of time sections, and acquires “average value + 2σ” as the above-mentioned assumed error. In step s41, the error estimation unit 50 acquires a target range in which the estimated value Vn (i) is to be stored based on the acquired assumed error. Specifically, as illustrated in FIG. 10, the error estimation unit 50 sets the value obtained by subtracting the assumed error from the upper limit value Vmax of the operation range as the upper limit value, and calculates the assumed error from the lower limit value Vmin of the operation range. A target range having a lower limit value obtained from the addition is acquired. Thereafter, the process returns to step s33.

  By performing the loop processing including steps s31 and s33 as described above, target ranges are acquired for all compensation points and time zones. The control execution unit 15 according to the present embodiment performs the same processing as steps s26 to s29 (FIG. 5) so that the compensation point voltage V (i), which is an actual measurement value, falls within the operation range in normal times. On the other hand, at the time of abnormality, processing similar to steps s26 to s29 is performed so that the estimated value Vn (i) falls within the target range.

  According to the voltage control apparatus 1 according to the present embodiment as described above, a target range can be acquired based on an assumed error that may occur. As a result, the actual compensation point voltage V (i) can be prevented from going out of the operating range.

  Although the case where the present embodiment is applied to the first embodiment has been described above, the present embodiment may be similarly applied to the second embodiment.

  1, 1a Voltage control device, 10 Voltage / power meter, 12 Measurement database, 13 Regression analysis unit, 15 Control execution unit, 16 Transformer, 32 Voltage control data processing unit, 50 Error estimation unit, i Compensation point.

Claims (4)

A voltage control device that adjusts a measurement point voltage that is a voltage at a predetermined measurement point of a distribution system,
A voltage regulating transformer electrically connected to the predetermined measurement point;
In the transformer, a measuring instrument for measuring the self-end voltage, the self-pass active power and the self-pass reactive power,
Measured at a plurality of time points, a measurement database that stores measurement data including the measurement point voltage, the self-end voltage, the self-end pass active power, and the self-end pass reactive power;
By performing multiple regression analysis on the measurement data stored in the measurement database, the voltage drop from the self-end voltage to the measurement point voltage, the self-pass active power, and the self-pass reactive power A regression analysis unit for calculating a correlation coefficient;
A control execution unit for controlling the voltage of the transformer,
The control execution unit
When the measurement point voltage is obtained, the voltage of the transformer is controlled so that the measurement point voltage is within the operation range,
When the measurement point voltage is not obtained, the self-end voltage measured by the measuring instrument, the self-end pass active power, the self-end pass reactive power, and the correlation coefficient Obtain an estimated value, control the voltage of the transformer so that the estimated value is within the operating range ,
Error estimation for acquiring a plurality of measured values of the measurement point voltage and a plurality of the estimated values corresponding to the measured values, and acquiring a predetermined error from statistical processing of errors between the measured values and the estimated values Part
Further comprising
The error estimator is
A value obtained by subtracting the predetermined error from the upper limit value of the operating range is obtained as an upper limit value of the target range in which the estimated value is to be stored, and the predetermined error is added from the lower limit value of the operating range. A voltage control apparatus , wherein the value is a lower limit value of the target range . The voltage control device according to claim 1,
The regression analysis unit calculates the correlation coefficient for each predetermined time period,
The control execution unit
A voltage control device that acquires the estimated value of the measurement voltage using the correlation coefficient in a time zone corresponding to a current time in the predetermined time zone when the measurement point voltage is not obtained. The voltage control apparatus according to claim 1 or 2,
A voltage control device capable of using a passing current as a substitute for the self-end passing active power and the self-end passing reactive power. The voltage control device according to any one of claims 1 to 3,
The measurement database and the regression analysis unit are mounted on a computer having a communication function,
The self-end voltage, the self-end pass active power, and the self-end pass reactive power are periodically uploaded from the measuring instrument to the measurement database,
The voltage control device, wherein the correlation coefficient is periodically downloaded from the regression analysis unit to the control execution unit.

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