JP2018152968A - Voltage control device and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a voltage control device and program capable of reducing possibility of voltage deviation with respect to a voltage tolerance range.SOLUTION: A voltage control device includes: a first risk calculation unit; a second risk calculation unit; and a voltage deviation risk calculation unit. The first risk calculation unit calculates a first risk based on the proximity of a voltage estimation value of a target node for which voltage control is performed and a limit value of a voltage tolerance range which is an allowable range of the voltage to be controlled. The second risk calculation unit calculates a second risk that an output value rises or falls based on a magnitude of the output value of a distributed power supply. The voltage deviation risk calculation unit calculates a voltage deviation risk indicating a risk that the voltage of the target node deviates from the voltage tolerance range based on the first risk and the second risk.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a voltage control device and a program.

  In the supply of electric power, in addition to ordinary power plants, there are increasing cases of using distributed power sources such as solar power generation and wind power generation using natural energy. The conventional voltage control apparatus has estimated the electric power estimated value of the consumer after progress of predetermined time based on the present electric power data. When the power control value is estimated by the voltage control device, the voltage of the power supplied by the distributed power source may fluctuate suddenly under the influence of a sudden fluctuation such as weather. Therefore, when power control is performed based on the estimated power value estimated by the conventional voltage control device, the demand voltage of the consumer may deviate from the allowable range of the supply voltage.

Japanese Patent Laying-Open No. 2015-84645

  The problem to be solved by the present invention is to provide a voltage control device and a program capable of reducing the possibility of voltage deviation from the allowable voltage range.

  The voltage control apparatus according to the embodiment includes a first risk calculation unit, a second risk calculation unit, and a voltage deviation risk calculation unit. The first risk calculation unit calculates the first risk based on the proximity of the estimated voltage value of the target node that performs voltage control and the limit value of the voltage allowable range that is the allowable range of the controlled voltage. The second risk calculation unit calculates a second risk that the output value increases or decreases based on the magnitude of the output value of the distributed power source. The voltage deviation risk calculation unit calculates a voltage deviation risk indicating a risk that the voltage of the target node deviates from the voltage allowable range based on the first risk and the second risk.

The figure which shows the structure of the voltage control system of 1st Embodiment. The figure which shows the data memorize | stored in a memory | storage part. The block diagram which shows the structure of a control part. The figure which shows the object node which a node extraction part extracts. The figure explaining the risk that a voltage estimated value will deviate from a voltage allowable range. The figure explaining the risk that the output value of a distributed power supply will rise or fall. The figure which shows the state which adjusts the voltage dead zone of an object node. The figure which shows the state which controls the voltage of an object node based on the adjusted voltage dead zone. The figure which shows the prediction range considered when estimating the estimated value of the load of a distributed power supply and an object node. The flowchart which shows the process of a voltage control apparatus. The flowchart which shows the process of the voltage control apparatus of 2nd Embodiment.

  Hereinafter, a voltage control device and a program according to an embodiment will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a diagram showing a configuration of the voltage control system 1. The voltage control system 1 performs voltage control by monitoring the power demand of a plurality of consumers (nodes) Amn in a plurality of areas Am. The voltage control system 1 includes, for example, a power supply V, a backbone bus 2, a transformer 3, a plurality of measuring instruments S1 to m, T1 to Tm, a communication aggregation device 40, and a voltage control device 100. The voltage control apparatus 100 includes a receiving unit 110, a storage unit 120, a control unit 200, and a display unit 300, for example.

  The voltage control system 1 is a system that transmits, for example, large power to a demand area in an urban area over a long distance. The plurality of areas Am exist over a wide area. The voltage control system 1 transforms the power supplied from the power supply 1 of the upper system by the branch system transformer 3 through the main system bus 2, and transforms the transformed power into a plurality of areas through the branch system bus 4. Supply to Am. In the voltage control system 1, the branch system bus 4 is connected to a plurality of power transmission lines C1 to Cm, and supplies power to a plurality of areas A1 to Am of the branch system via the plurality of power transmission lines C1 to Cm. Thereby, the voltage control system 1 is an electric power system that spreads radially from the power distribution system buses M1 to Mm. Measuring devices S1 to Sm and T1 to Tm are installed at the start and end of each area A1 to Am.

  In each area A1 to Am, electric power is supplied to a plurality of consumers Amn. The loads of each consumer Amn are an active power load (PL) and a reactive power load (QL). In addition, a distributed power source (PV) may be added to the load of the consumer Amn. The distributed power source (PV) is, for example, photovoltaic power generation. The distributed power source (PV) may be other energy such as wind power generation in addition to solar power generation.

  Measurement information measured by the measuring instruments S1 to Sm and T1 to Tm is transmitted to the voltage control device 100 via the communication aggregation device 40 by a dedicated communication line 32 or wirelessly. The voltage control apparatus 100 includes a receiving unit 110, a storage unit 120, a control unit 200, and a display unit 300, for example. The receiving unit 110 receives, for example, measurement data 121 measured in each area A1 to Am. The storage unit 120 stores, for example, various data necessary for voltage control in addition to the measurement data 121.

  The storage unit 120 is a storage device that stores various data. The storage unit 10 is realized by, for example, an HDD (Hard Disc Drive), a flash memory, an EEPROM (Electrically Erasable Programmable Read Only Memory), a ROM (Read Only Memory), or a RAM (Random Access Memory). The input data storage unit 11 stores various input data acquired in the product manufacturing process. FIG. 2 is a diagram illustrating data stored in the storage unit 120. The storage unit 120 stores, for example, measurement data 121, system configuration data 122, PL distribution coefficient data, QL distribution coefficient data, and PV distribution coefficient data.

  The measurement data 121 is data measured by the measuring instruments S1 to Sm and T1 to Tm. The system configuration data 122 is data that configures the areas A1 to Am, and data that configures the customer Amn in each of the areas A1 to Am. The PL distribution coefficient data, the QL distribution coefficient data, and the PV distribution coefficient data are distribution coefficient data used for power control.

  The control unit 200 performs power control based on data stored in the storage unit 120, for example. The display unit 300 displays the result of the voltage controlled by the control unit 200, for example. FIG. 3 is a block diagram illustrating a configuration of the control unit 200. The control unit 200 includes, for example, a risk calculation unit 210, a dead zone adjustment unit 220, a voltage control unit 230, a load / PV prediction unit 240, and a node extraction unit 250. The risk calculation unit 210 includes, for example, a first risk calculation unit 211, a second risk calculation unit 212, and a voltage deviation risk calculation unit 213.

  The first risk calculation unit 211, the second risk calculation unit 212, and the voltage deviation risk calculation unit 213 are each realized by a processor (such as a CPU (Central Processing Unit)) executing a program (software). Some or all of the functional units of the first risk calculation unit 211, the second risk calculation unit 212, and the voltage deviation risk calculation unit 213 are LSI (Large Scale Integration), ASIC (Application Specific Integrated Circuit), and FPGA. It may be realized by hardware such as (Field-Programmable Gate Array) or may be realized by cooperation of software and hardware.

  The load / PV prediction unit 240 estimates the estimated voltage value of the load of the consumer Amn based on the measurement data 121. FIG. 4 is a diagram illustrating target nodes extracted by the node extraction unit 250. As shown in the figure, a voltage target value to be controlled by each consumer Amn (node m) is set. As shown in the figure, a voltage maintenance range, a voltage allowable range, and a voltage dead zone are set. Here, the voltage maintenance range is a voltage range that must be observed in operation. The allowable voltage range is an allowable voltage range for operation. Normally, the voltage dead zone is equal to the allowable voltage range. When the voltage deviates from the voltage dead zone, the tap value or the necessity of control of the phase adjusting equipment is determined.

  Based on the estimation result of the load / PV prediction unit 240, the node extraction unit 250 extracts a plurality of consumers Amn including the distributed power sources PVm-n in the respective areas A1 to Am. The output of the distributed power source PVm-n varies depending on the weather. Therefore, the load of the consumer Amn (node m) including the distributed power source PVm-n may deviate from the allowable voltage range due to the influence of weather. The node extraction unit 250 extracts, as a target node, a customer Amn (for example, the node 5) whose voltage estimated value is within a predetermined threshold from the upper limit or lower limit of the voltage allowable range from among the plurality of consumers Amn. The node extraction unit 250 extracts, for example, the node 5 whose voltage estimation value is closest to the upper limit or lower limit of the voltage allowable range as the target node.

  The risk calculation unit 210 calculates a risk that the voltage of the consumer Amn extracted as the target node by the node extraction unit 250 deviates from the allowable voltage range. The first risk calculation unit 211 calculates the first risk based on the proximity between the estimated voltage value of the consumer Amn extracted as the target node and the limit value of the voltage allowable range that is the allowable range of the controlled voltage. To do. FIG. 5 is a diagram for explaining the risk that the estimated voltage value deviates from the allowable voltage range.

  As shown in FIG. 5A, when the estimated voltage value of the consumer Amn extracted as the target node is close to the upper limit of the allowable voltage range, the consumer Amn voltage is caused by fluctuations in the output of the distributed power source PVm-n. May deviate from the upper limit of the allowable voltage range. As shown in FIG. 5B, when the estimated voltage value of the consumer Amn extracted as the target node is close to the lower limit of the allowable voltage range, the consumer Amn voltage is caused by fluctuations in the output of the distributed power source PVm-n. May deviate from the lower limit of the allowable voltage range.

電圧推定値が電圧目標値以下の場合、

ここで、
Ｖ_ｕｐ：許容範囲上限値
Ｖ_ｄｎ：許容範囲下限値
Ｖ_ｅｓｔ：電圧推定値
Ｖ_ｓｅｔ：電圧目標値
である。このように、第１リスクＲ_Ｖは電圧推定値が許容範囲上下限の場合最大となり、電圧の目標値の時に最小である。第１リスクＲ_Ｖの計算式は上記例の他、同様なリスクを評価できるものであれば他の方法を用いてもよい。 The first risk calculation unit 211 calculates a risk based on whether or not the estimated voltage value of the consumer Amn extracted as the target node is close to the limit value of the allowable voltage range. Here, when the estimated voltage value of the consumer Amn extracted as the target node is also close to the upper limit value of the allowable voltage range, there is a high risk that the voltage after a predetermined time deviates from the upper limit value of the allowable voltage range. When the estimated voltage value of the consumer Amn extracted as the target node is close to the lower limit value of the allowable voltage range, there is a high risk that the voltage after a predetermined time deviates from the lower limit value of the allowable voltage range. The first risk R _V is expressed by the following formula, for example, by the first risk calculation unit 211. When the voltage estimated value V _est is larger than the voltage target value V _set , that is, when V _est > V _set

If the estimated voltage is below the target voltage,

here,
V _up : allowable range upper limit value V _dn : allowable range lower limit value V _est : voltage estimated value V _set : voltage target value. Thus, the first risk _RV is maximum when the estimated voltage value is the upper and lower limit of the allowable range, and is minimum when the voltage is the target value. Equation of the first risk R _V is other than the above examples, other methods may be used as long as it can evaluate the same risks.

  The second risk calculation unit 212 calculates a second risk that the output value of the distributed power source PVm-n increases or decreases based on the magnitude of the output value of the distributed power source PVm-n. FIG. 6 is a diagram for explaining the risk that the output value (PV output) of the distributed power source PVm-n increases or decreases. When the estimated voltage value is higher at time t and the PV output of the distributed power source PVm-n is closer to 0, the risk that the output of the distributed power source PVm-n increases at time t + 1 increases.

  That is, there is a high risk that the voltage of the target node after a predetermined time deviates from the upper limit of the allowable range. On the other hand, when the estimated voltage value is lower at time t and the PV output of the distributed power source PVm-n is closer to the maximum output, the risk that the PV output of the distributed power source PVm-n will drop increases. That is, the risk that the voltage of the target node after a predetermined time deviates from the lower limit of the allowable range increases.

電圧推定値が電圧目標値以下の場合、

ここで、
ＰＶ_ｅｓｔ：ＰＶ推定値
ＰＶ_ｍａｘ：ＰＶ最大出力
である。このように、第２リスクＲ_ＰＶは電圧高めの場合は分散型電源ＰＶｍ−ｎの時刻ｔにおけるＰＶ出力に基づいて変動する。第２リスクＲ_ＰＶの計算式は上記例の他、同様なリスクを評価できるものであれば他の方法を用いてもよい。 The second risk R _PV is represented by the following mathematical formula. When the voltage estimated value V _est is larger than the voltage target value V _set , that is, when V _est > V _set

If the estimated voltage is below the target voltage,

here,
PV _est : PV estimated value PV _max : PV maximum output. Thus, the second risk R _PV fluctuates based on the PV output at time t of the distributed power source PVm-n when the voltage is increased. The calculation formula of the second risk R _PV may be other methods as long as the same risk can be evaluated in addition to the above example.

本例ではＰＶが変動するリスクＲ_ＰＶを電圧の変動のリスクに変換するための係数Ｋ（単位を揃えるため）をＲ_ＰＶに乗じているが、これに限らない。即ち、電圧逸脱リスクＲ_{ｔｏｔａｌ}は、第１リスクＲ_ｖと第２リスクＲ_ｐｖとの大きさによって変動するリスクである。上記例では電圧逸脱リスクＲ_{ｔｏｔａｌ}は、ＲＭＳを用いて算出されているが、同様なリスクを評価できるものであれば他の方法を用いてもよい。 Voltage deviation risk calculating unit 213, based on the first risk R _v and second risk R _PV, calculates a voltage deviation risk R _total indicating the risk of voltage of node deviates from the allowable voltage range. The voltage deviation risk R _total is calculated using, for example, root mean square (RMS).

In the present example it is multiplied factor K for converting the risks R _PV of PV fluctuates risk of fluctuations in voltage (to align the unit) to R _PV, not limited to this. That is, the voltage deviation risk R _total is a risk that varies depending on the magnitudes of the first risk R _v and the second risk R _pv . In the above example, the voltage deviation risk R _total is calculated using RMS, but other methods may be used as long as the same risk can be evaluated.

The dead zone adjusting unit 220 adjusts the voltage dead zone of the target node based on the voltage deviation risk R _total . FIG. 7 is a diagram illustrating a state in which the voltage dead zone of the target node is adjusted. As shown in the figure, when the voltage of the target node is close to the upper limit value of the allowable voltage range, the dead band adjusting unit 220 reduces the upper limit value of the dead band at time t + 1 in order to prevent the voltage from exceeding the upper limit value of the allowable voltage range. Then, the control amount is increased in the direction of decreasing the voltage (formula (6)).

When the voltage of the target node is close to the lower limit value of the voltage tolerance range, the dead zone adjustment unit 220 sets the lower limit value of the dead zone at time t + 1 (for example, after 1 minute) to prevent the voltage from deviating from the lower limit value of the voltage tolerance range. Increase the control amount in the direction to increase the voltage. Specifically, the dead band adjustment unit 220 uses the adjustment sensitivity coefficient α (first coefficient) and the adjustment sensitivity coefficient β (second coefficient) based on R _total as shown in Expression (7), to calculate the voltage dead band adjustment amount. calculate. When the voltage estimated value V _est is larger than the voltage target value V _set , that is, when V _est > V _set

電圧推定値が電圧目標値以下の場合、

但し、
Ｘ１：Ｖ_ｕｐ〜Ｖ_ｓｅｔの幅
Ｘ２：Ｖ_ｄｎ〜Ｖ_ｓｅｔの幅
α、β：調整感度係数（０＜α、０＜β）
である。

If the estimated voltage is below the target voltage,

However,
X1: V _{up to} V _set width X2: V _{dn to} V _set width α, β: Adjustment sensitivity coefficient (0 <α, 0 <β)
It is.

Deadband adjusting unit 220, based on the voltage deviation risk R _total, when voltage estimation value of the target node is the risk of exceeding the upper limit of the allowable voltage range higher multiplies the first coefficient α to the voltage deviation risk R _total target Lower the upper limit of the node voltage dead band. The dead band adjusting unit 220 multiplies the voltage deviation risk R _total by the second coefficient β based on the voltage deviation risk R _total when the estimated voltage exceeds the lower limit value of the voltage allowable range. Increase the lower limit of the dead zone.

  The voltage control unit 230 estimates the voltage after a predetermined time (for example, after 1 minute) based on the voltage dead zone adjusted by the dead zone adjusting unit 220 and controls the voltage of the target node. FIG. 8 is a diagram illustrating a state in which the voltage of the target node is controlled based on the adjusted voltage dead zone. The voltage control unit 230 controls the voltage after a predetermined time from the estimated values of the load of the distributed power source and the target node. In addition, the estimated value of the load of the distributed power source and the target node is a prediction range (for example, standard deviation ± shown in FIG. 9) in addition to the one-point predicted value (the predicted maximum likelihood value having the highest probability of becoming the predicted value). It may be estimated in consideration of (within 2σ). In particular, it is effective to perform state estimation in consideration of a prediction range for a distributed power source having a large short-time fluctuation.

  The voltage control unit 230 acquires the output predicted value of the distributed power source and the demand predicted value of the target node based on the measurement data 121. The voltage control unit 230 calculates the estimated voltage of the target node after a predetermined time based on the output predicted value of the distributed power source and the demand predicted value of the target node, so that the estimated voltage is within the voltage dead zone of the target node. The control value of at least one of the tap value of the target node and the phase adjusting equipment is determined.

  In addition, the voltage controller 230 may control the voltage using an objective function. For example, the objective function is defined as the difference between the target node voltage and the target value. In this case, when the voltage control unit 230 has a constraint condition that the voltage falls within the voltage dead zone of the target node, the tap value and the phase adjustment equipment so that the difference between the voltage of the target node and the target value is minimized. At least one control amount may be determined. That is, the voltage control unit 230 may determine the control amount of at least one of the tap value and the phase adjusting equipment so as to minimize an error from the target value of the voltage of the target node.

  Further, the objective function is defined as a change amount after a predetermined time and a predetermined time of the control value of the tap value or the phase adjusting equipment. In this case, the voltage control unit 230 sets the time t (predetermined time) and the time t + 1 (predetermined time) of the control amount of the tap value or the phase adjusting equipment when the voltage is within the voltage dead zone of the target node. The control value of the tap value or the phase adjusting equipment may be determined so that the amount of change in (after) is minimized. That is, the voltage control unit 230 minimizes the tap value from the predetermined time point or the control amount of the phase adjusting equipment.

  Next, the process flow of the voltage control apparatus 100 will be described.

  FIG. 10 is a flowchart showing processing of the voltage control apparatus 100. Based on the measurement data 121, the node extraction unit 250 extracts a node whose voltage estimation value is within a predetermined threshold from the upper limit or lower limit of the voltage allowable range as a target node for adjusting the dead zone (step S100). The first risk calculation unit 211 calculates the first risk based on the proximity between the estimated voltage value of the target node and the limit value of the allowable voltage range (step S110). The second risk calculation unit 212 calculates a second risk that the PV output increases or decreases based on the magnitude of the PV output (step S120).

Voltage deviation risk calculating unit 213, based on the first risk _{R v} and second risk _{R PV,} calculates a voltage deviation risk _{R total} (step S130). The dead zone adjusting unit 220 recognizes whether or not the estimated voltage value of the target node is close to the upper limit value of the allowable voltage range based on the voltage deviation risk R _total (step S140). When the estimated voltage value of the target node is close to the upper limit value of the allowable voltage range (step S140: Yes), the dead zone adjusting unit 220 lowers the upper limit of the voltage dead zone (step S150).

  When the estimated voltage value of the target node is not close to the upper limit value of the allowable voltage range, that is, when the estimated voltage value of the target node is close to the lower limit value of the allowable voltage range (step S140: No), the dead band adjusting unit 220 Is raised (step S160). The voltage control unit 230 controls the voltage of the target node based on the voltage dead zone adjusted by the dead zone adjusting unit 220 (step S170).

  According to the first embodiment described above, the voltage control apparatus 100 includes the risk calculation unit 210, the dead zone adjustment unit 220, and the voltage control unit 230, so that the output of the distributed power source and the voltage tolerance at the present time can be obtained. The voltage deviation risk can be quantitatively evaluated based on the voltage value of the target node with respect to the range, and the voltage dead zone can be adjusted according to the voltage deviation risk. The voltage control apparatus 100 can determine the tap value and the control amount of the phase adjusting equipment in advance from the adjusted voltage dead zone and the voltage estimation result after a predetermined time. Thus, when the voltage deviation risk is high, the voltage control apparatus 100 can determine the tap value and the control amount of the phase adjusting equipment so as to reduce the voltage deviation risk.

  The voltage control device 100 calculates the tap value and the phase adjusting equipment in advance when the risk of the voltage deviating due to the deviated predicted value of the distributed power source or the load is high as the risk. The control amount can be determined, and voltage deviation when the prediction is lost can be avoided. Since the dead zone adjustment amount is small when the voltage deviation risk is low, the voltage control device 100 can suppress excessive adjustment of the tap value and the control amount of the phase adjusting equipment.

(Second Embodiment)
In the first embodiment, the dead zone adjusting unit 220 determines the adjustment sensitivity coefficients α and β for adjusting the voltage dead zone. In the second embodiment, a method for specifically determining the adjustment sensitivity coefficients α and β will be described. The device configuration according to the second embodiment is the same as the device configuration according to the first embodiment.

  As described above, the adjustment of the voltage dead zone in consideration of the voltage deviation risk is to avoid the voltage deviation of the target node when the output of the distributed power source fluctuates and the predicted value of the voltage of the target node is deviated. it can. Here, it is important to appropriately determine the adjustment sensitivity coefficients α and β for converting the voltage deviation risk into the dead band adjustment amount. For example, when α and β are too large, the voltage dead zone is unnecessarily adjusted, the control amount of the voltage becomes excessive, and control hunting such as the output value oscillating around the target value may occur. In addition, if α and β are too small, the dead zone adjustment amount is small with respect to the voltage deviation risk, so that the voltage deviation can occur when the output of the distributed power source fluctuates and the predicted value of the voltage of the target node deviates. There is sex. The dead zone adjusting unit 220 according to the second embodiment appropriately determines the adjustment sensitivity coefficients α and β using the accumulated past measurement data 121.

  The dead zone adjustment unit 220 determines whether or not to adjust α and β based on the past measurement data 121. The criteria for determining whether or not the dead zone adjusting unit 220 needs to adjust the adjustment sensitivity coefficients α and β is, for example, when the number of times that the voltage value of the target node has deviated from the voltage dead zone exceeds a predetermined threshold, Is exceeding a predetermined threshold, or when a certain time has passed (for example, one day). The dead zone adjusting unit 220 determines a target period of when to use the past measurement data 121 used when determining the adjustment sensitivity coefficients α and β.

  The dead zone adjustment unit 220 determines an objective function used when adjusting the adjustment sensitivity coefficients α and β. The objective function is, for example, the integrated value of the absolute voltage from the voltage target value, the number of times of phase change, or the like. The dead zone adjusting unit 220 optimizes the adjustment sensitivity coefficients α and β so as to improve the determined objective function under the constraint that the voltage dead zone is not deviated based on the past measurement data 121 in the target period. The dead zone adjusting unit 220 adjusts the adjustment sensitivity coefficients α and β so that the voltage of the target node does not deviate from the voltage dead zone adjusted based on the objective function in the past measurement data 121. The dead zone adjusting unit 220 adjusts the adjustment sensitivity coefficients α and β so that the tap value of the target node or the number of changes in the control amount of the phase adjusting equipment satisfies a predetermined condition.

  Next, the process flow of the voltage control apparatus 100 will be described.

  FIG. 11 is a flowchart showing processing of the voltage control apparatus 100. The dead zone adjusting unit 220 determines whether or not to adjust the adjustment sensitivity coefficients α and β depending on whether or not a predetermined threshold value is exceeded (step S200). When the threshold value is exceeded (step S200: Yes), the dead zone adjusting unit 220 determines the target period of the past measurement data 121 (step S210). The dead zone adjusting unit 220 determines an objective function used when adjusting the adjustment sensitivity coefficients α and β (step S220).

  The dead zone adjusting unit 220 adjusts the adjustment sensitivity coefficients α and β so that the voltage of the target node does not deviate from the voltage dead zone in the past measurement data 121 (step S230). The dead zone adjusting unit 220 returns to step S200 at time T after the predetermined time Δt has elapsed (step S240).

  According to the second embodiment described above, the voltage control apparatus 100 sets the adjustment sensitivity coefficients α and β that improve the desired objective function without departing from the voltage dead zone based on the accumulated past measurement data 121. Can be adjusted. In addition, the voltage control device 100 can increase the target period of the accumulated measurement data 121 or select a severe case so that the voltage dead zone can be obtained even when the situation of the voltage control system 1 changes significantly. The adjustment sensitivity coefficients α and β can be adjusted so as not to deviate from. As a result, the voltage control apparatus 100 can select the robust adjustment sensitivity coefficients α and β that do not deviate from the voltage dead zone and can obtain good results with respect to a desired objective function.

  According to at least one embodiment described above, the risk that the voltage of the distributed power supply rapidly changes because the voltage control device 100 includes the risk calculation unit 210, the dead band adjustment unit 220, and the voltage control unit 230. The voltage to be supplied can be controlled in consideration of the above.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Voltage control system, 2 ... Core system bus | bath, 3 ... Transformer, 4 ... Branch system bus | bath, 10 ... Memory | storage part, 11 ... Input data memory | storage part, 32 ... Communication line, 40 ... Aggregation apparatus for communication, 100 ... Voltage Control device, 110 ... receiving unit, 120 ... storage unit, 121 ... measurement data, 122 ... system configuration data, 200 ... control unit, 210 ... risk calculation unit, 211 ... first risk calculation unit, 212 ... second risk calculation unit 213 ... Voltage deviation risk calculation unit, 220 ... Dead band adjustment unit, 230 ... Voltage control unit, 240 ... Prediction unit, 250 ... Node extraction unit, 300 ... Display unit

Claims (9)

A first risk calculation unit that calculates a first risk based on a proximity between a voltage estimation value of a target node that performs voltage control and a limit value of a voltage allowable range that is an allowable range of the controlled voltage;
A second risk calculation unit that calculates a second risk that the output value increases or decreases based on the magnitude of the output value of the distributed power source;
A voltage deviation risk calculation unit that calculates a voltage deviation risk indicating a risk that the voltage of the target node deviates from the voltage allowable range based on the first risk and the second risk;
Voltage control device. Based on the voltage deviation risk, when there is a high risk that the estimated voltage value of the target node exceeds the upper limit value of the allowable voltage range, the upper limit value of the voltage dead zone of the target node is reduced, and the estimated voltage value is the voltage When there is a high risk of exceeding the lower limit value of the allowable range, it further includes a dead zone adjustment unit that adjusts the voltage dead zone so as to increase the lower limit value of the voltage dead zone of the target node.
The voltage control apparatus according to claim 1. An extraction unit that extracts, as the target node, a node whose voltage estimated value is within a predetermined threshold from an upper limit or a lower limit of the voltage allowable range;
The voltage control apparatus according to claim 1 or 2. Obtaining an output predicted value of the distributed power source and a demand predicted value of the target node, calculating an estimated voltage of the target node after a predetermined time based on the output predicted value and the demand predicted value, and the target node A voltage control unit that determines a control amount of at least one of the tap value of the target node and the phase adjusting equipment so that the estimated voltage falls within the voltage dead zone of
The voltage control apparatus of any one of Claim 1 to 3. When the voltage control unit has a constraint that the voltage falls within the voltage dead zone of the target node, the tap value and the target value are set so that a difference between the voltage of the target node and a target value satisfies a predetermined condition. Determine the control amount of at least one of the phase adjusting equipment,
The voltage control device according to claim 4. When the voltage control unit has a constraint condition that the voltage falls within the voltage dead zone of the target node, a predetermined time point and a change amount after a predetermined time of the control amount of the phase adjusting equipment are predetermined. The control value of the tap value or the phase adjusting equipment is determined so as to satisfy the condition of
The voltage control device according to claim 4. When the dead zone adjustment unit adjusts the voltage dead zone of the target node based on the voltage deviation risk, when the risk that the estimated voltage value of the target node exceeds the upper limit value of the voltage allowable range is high, the voltage When the deviation risk is multiplied by a first coefficient to lower the upper limit value of the voltage dead zone of the target node, and when the risk that the estimated voltage value of the target node exceeds the lower limit value of the allowable voltage range is high, the voltage deviation risk Is multiplied by a second coefficient to increase the lower limit of the voltage dead zone of the target node.
The voltage control apparatus according to claim 2. The dead zone adjustment unit selects a target period based on past data, and the voltage of the target node falls within the voltage dead zone of the target node in the target period, and the tap value or phase adjusting equipment of the target node Adjusting at least one of the first coefficient and the second coefficient so that the number of changes in the control amount satisfies a predetermined condition;
The voltage control apparatus according to claim 7. On the computer,
The first risk is calculated based on the proximity of the voltage estimation value of the target node that performs voltage control and the limit value of the voltage allowable range that is the allowable range of the controlled voltage,
Calculating a second risk that the output value rises or falls based on the magnitude of the output value of the distributed power source;
Based on the first risk and the second risk, a voltage deviation risk indicating a risk that the voltage of the target node deviates from the allowable voltage range is calculated.
program.

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