Intelligent electronic device, voltage control system, and voltage control method

Abstract

The intelligent electronic device is installed in a power distribution system and includes a control target acquisition unit that acquires information indicating a control target range from a voltage management system, a voltage detection unit that detects the voltage of the power distribution system, a controllable amount acquisition unit that acquires information indicating a controllable amount from a distributed energy source, a control amount calculation unit that calculates a control amount for the distributed energy source so that the voltage detected by the voltage detection unit falls within the controllable amount range when it is determined that the voltage detected by the voltage detection unit deviates from the control target range, and a control amount transmission unit that transmits the control amount calculated by the control amount calculation unit to the distributed energy source. This makes it possible to control the voltage of the power distribution system in response to sudden load fluctuations or output fluctuations of renewable energy.

Description

[Technical field]

[0001] The present disclosure relates to an intelligent electronic device, a voltage control system, and a voltage control method. [Background technology]

[0002] Conventionally, there is a voltage management system that remotely adjusts an SVR (automatic voltage regulator) installed in a power distribution system using a voltage distribution based on past records, with the aim of maintaining the voltage of the power distribution system within an appropriate range. Patent Document 1 discloses a power distribution system monitoring and control method that monitors the amount of electricity in a power distribution line in real time, estimates the amount of load power, and controls the opening and closing of switching means related to a power transmission path.

[0003] However, as the number of renewable energy sources, such as solar cells, connected to the power distribution system increases, there is a problem that the voltage management system may not be able to keep up with sudden load fluctuations or output fluctuations of the renewable energy. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 6-189455 Summary of the Invention [Problem to be solved by the invention]

[0005] The problem to be solved is how to control the voltage of a power distribution system in response to sudden load fluctuations or output fluctuations of renewable energy. [Means for solving the problem]

[0006] One aspect of the present disclosure is an intelligent electronic device installed in a power distribution system, comprising: a control target acquisition unit that acquires information indicating a control target range from a voltage management system; a voltage detection unit that detects the voltage of the power distribution system at a location where the intelligent electronic device is installed; a controllable quantity acquisition unit that acquires information indicating a controllable quantity from a distributed energy source connected to the power distribution system; a control quantity calculation unit that calculates a control quantity for the distributed energy source so that the voltage detected by the voltage detection unit is within the control target range when it is determined that the voltage detected by the voltage detection unit deviates from the control target range, and a control quantity transmission unit that transmits the control quantity calculated by the control quantity calculation unit to the distributed energy source.

[0007] Another aspect of the present disclosure is the above-mentioned intelligent electronic device, wherein the information indicating the control target range includes information indicating a control target range for each predetermined first period, and the detection of the voltage by the voltage detection unit, the calculation of the control amount by the control amount calculation unit, and the transmission of the control amount by the control amount transmission unit are performed for each predetermined second period that is shorter than the first period.

[0008] Another aspect of the present disclosure is the intelligent electronic device described above, wherein the controllable amount acquisition unit acquires information indicating the controllable amount every second period.

[0009] Another aspect of the present disclosure is the above-mentioned intelligent electronic device, wherein the control amount calculated by the control amount calculation unit includes at least one of a control amount in the power generation direction, a control amount in the load direction, a control amount in the capacitor direction, and a control amount in the reactor direction.

[0010] Another aspect of the present disclosure is a voltage control system comprising an intelligent electronic device installed in a power distribution system and a voltage management system that transmits information indicating a control target range to the intelligent electronic device, wherein the intelligent electronic device comprises a control target acquisition unit that acquires information indicating the control target range from the voltage management system, a voltage detection unit that detects the voltage of the power distribution system at a location where the intelligent electronic device is installed, a controllable quantity acquisition unit that acquires information indicating a controllable quantity from a distributed energy source connected to the power distribution system, a control quantity calculation unit that calculates a control quantity for the distributed energy source so that the voltage detected by the voltage detection unit is within the range of the controllable quantity when it is determined that the voltage detected by the voltage detection unit deviates from the control target range, and a control quantity transmission unit that transmits the control quantity calculated by the control quantity calculation unit to the distributed energy source.

[0011] Another aspect of the present disclosure is the above-mentioned voltage control system, comprising the distributed energy source.

[0012] Another aspect of the present disclosure is a voltage control method using an intelligent electronic device installed in a power distribution system, the voltage control method including a first step of acquiring information indicating a target control range from a voltage management system, a second step of detecting the voltage of the power distribution system at a location where the intelligent electronic device is installed, a third step of acquiring information indicating a controllable amount from a distributed energy source connected to the power distribution system, a fourth step of calculating a control amount for the distributed energy source so that the voltage detected in the second step is within the range of the controllable amount if it is determined that the voltage detected in the second step deviates from the target control range, and a fifth step of transmitting the control amount calculated in the fourth step to the distributed energy source. Effect of the Invention

[0013] The intelligent electronic device, voltage control system, or voltage control method disclosed herein can control the voltage of a power distribution system in response to sudden load fluctuations or output fluctuations of renewable energy. [Brief description of the drawings]

[0014] [Figure 1] 1 is a schematic diagram showing a configuration of a voltage control system 10 according to a first embodiment of the present disclosure. [Diagram 2] 4 is a graph illustrating the operation of the voltage management system 100 in the embodiment. [Diagram 3] 1 is a schematic block diagram showing the configuration of an IED 400 in the same embodiment. [Figure 4] 13 is a table showing an example of the contents stored in a control target storage unit 402 in the embodiment. [Diagram 5] 13 is a table showing an example of contents stored in a control parameter storage unit 404 in the embodiment. [Figure 6] 13 is a table showing an example of the contents stored in an equipment storage unit 406 in the embodiment. [Figure 7] 13 is a table showing an example of the contents stored in a controllable amount storage unit 408 in the embodiment. [Figure 8] 5 is a schematic diagram illustrating setting information of a distributed energy source 500 in the embodiment. FIG. [Figure 9] 11 is a time chart illustrating the operation of the IED 400 in the embodiment. [Figure 10] 13 is a flowchart (part 1) illustrating the operation of a control amount calculation unit 409 in the embodiment. [Figure 11] 13 is a flowchart (part 2) illustrating the operation of the control amount calculation unit 409 in the embodiment. [Figure 12] 13 is a flowchart (part 3) illustrating the operation of the control amount calculation unit 409 in the embodiment. [Figure 13] 13 is a flowchart (part 4) illustrating the operation of the control amount calculation unit 409 in the embodiment. [Figure 14]13 is a flowchart (part 5) illustrating the operation of the control amount calculation unit 409 in the embodiment. [Figure 15] 13 is a flowchart (part 6) illustrating the operation of the control amount calculation unit 409 in the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Fig. 1 is a schematic diagram showing a configuration of a voltage control system 10 according to a first embodiment of the present disclosure. The voltage control system 10 includes a voltage management system 100 and an IED (intelligent electronic device) 400. The voltage control system 10 may include an SVR 200, an IED management system 300, or distributed energy resources (DER) 500.

[0016] 1, a power distribution line C is an electric wire of a power distribution system for supplying power to consumers. A utility pole S is a pole for erecting the power distribution line C, and an SVR 200, an IED 400, and the like are installed on the utility pole S.

[0017] The voltage management system 100 is connected to the SVR200 and the IED400 so as to be able to communicate with them. The voltage management system 100 calculates the set value of the SVR200 and transmits information indicating the set value to the SVR200. Furthermore, the voltage management system 100 calculates the control target range of the IED400 and transmits information indicating the control target range to the IED400. For example, the voltage management system 100 calculates and transmits these set values ​​and control target ranges for 48 sections (24 hours in 30-minute increments) of the next day. That is, the voltage management system 100 calculates the set value and the control target range in 30-minute (first cycle) increments and transmits information indicating each of them to the SVR200 and the IED400. Note that this first cycle is not limited to 30 minutes, and may be shorter or longer than 30 minutes. Furthermore, the voltage management system 100 may be realized by one or more computers reading and executing a program.

[0018] FIG. 2 is a graph illustrating the operation of the voltage management system 100 in this embodiment. In FIG. 2, the horizontal axis is the distance from the SVR200, and the vertical axis is the high-voltage system voltage, i.e., the voltage of the distribution line C. An upper operational limit U and a lower operational limit L are set for the high-voltage system voltage. The voltage at the end of the distribution line or at another SVR is the upper operational limit U, and the voltage distribution in the case with the lightest load among the estimated cases is the lightest-load voltage distribution Ud. Furthermore, the voltage at the end of the distribution line or at another SVR is the lower operational limit L, and the voltage distribution in the case with the heaviest load among the estimated cases is the heaviest-load voltage distribution Ld. The voltage management system 100 calculates the lightest-load voltage distribution Ud at the installation point of the SVR200 based on the upper limit setting value S of the SVR200. U The heaviest load voltage distribution Ld at the installation point of the SVR200 is set to the lower limit setting value S L In addition, the voltage management system 100 calculates the lightest load voltage distribution Ud at the installation point of the IED 400 by multiplying the control target upper limit value V U The maximum load voltage distribution Ld at the IED400 installation point is set to the control target lower limit V L Let us assume that.

[0019] Returning to FIG. 1, the SVR 200 receives an upper limit setting value S U and the lower limit setting value S L The SVR200 obtains the voltage at the installation point of the SVR200 by setting the upper limit value S U and the lower limit setting value S L Adjust so that it is within the range.

[0020] The IED management system 300 is communicably connected to the IED 400. The IED management system 300 sets control parameters in the IED 400 when the IED 400 is installed or when maintenance is performed. The control parameters are a control operation time limit T L , control period (second period) T C , deviation resolution judgment voltage range ΔV S , control damping coefficient C, P sensitivity coefficient K P , Q sensitivity coefficient K QThe IED management system 300 may include any one of the above. The IED management system 300 may be connected to the IED 400 so as to be able to communicate with the IED 400 at all times, or may be connected only when setting control parameters in the IED 400. The IED management system 300 may be realized by one or more computers reading and executing a program.

[0021] The IED 400 is an intelligent electronic device installed in a power distribution system, and when it is determined that the voltage at the installation location deviates from the control target range acquired from the voltage management system 100, it controls the output of the distributed energy source 500 connected to the power distribution system. When the IED 400 controls the output of the distributed energy source 500, the control amount is set to be within the range of the controllable amount indicated by the information acquired from the distributed energy source 500. The period of the output control of the distributed energy source 500 by the IED 400 is set to the control period T C where the value is shorter than the first period, which is the period of the control target range.

[0022] The distributed energy source 500 is an energy source including a power generation facility and a power storage facility connected to a power distribution system. The distributed energy source 500 includes a power generation facility using renewable energy such as a solar cell. The distributed energy source 500 is communicably connected to the IED 400 and transmits information indicating a controllable amount of output increase / decrease to the IED 400.

[0023] 3 is a schematic block diagram showing the configuration of the IED 400 in this embodiment. The IED 400 includes a control target receiving unit (control target acquiring unit) 401, a control target storage unit 402, a control parameter receiving unit 403, a control parameter storage unit 404, a voltage effective value calculating unit (voltage detecting unit) 405, an equipment storage unit 406, a controllable amount receiving unit (controllable amount acquiring unit) 407, a controllable amount storage unit 408, a control amount calculating unit 409, and a control amount transmitting unit 410. The control target receiving unit 401, the control parameter receiving unit 403, the voltage effective value calculating unit 405, the controllable amount receiving unit 407, the control amount calculating unit 409, and the control amount transmitting unit 410 may be configured by a processing unit such as a CPU (Central Processing Unit) or a dedicated electronic circuit. In addition, the control target memory unit 402, the control parameter memory unit 404, the equipment memory unit 406, and the controllable quantity memory unit 408 are configured using a storage medium, such as a hard disk drive (HDD), a flash memory, an electrically erasable programmable read only memory (EEPROM), a random access read / write memory (RAM), a read only memory (ROM), or any combination of these storage media.

[0024] The control target receiving unit 401 acquires information indicating the control target range from the voltage management system 100, and stores it in the control target storage unit 402. In this embodiment, the control target receiving unit 401 receives the control target upper limit value V U and the control target lower limit V L The control target storage unit 402 receives the control target upper limit value V U and the control target lower limit V L In this embodiment, the information indicating the control target range is the control target upper limit value V U and the control target lower limit V L However, the interval is not limited to 30 minutes, and may be a different time interval.

[0025] 4 is a table showing an example of the contents stored in the control target storage unit 402 in this embodiment. In the example shown in FIG. 4, the control target storage unit 402 stores the control target upper limit value V U [V] "6,680" and the control target lower limit V L Similarly, the control target storage unit 402 stores the control target upper limit value V U [V] "6,650" and the control target lower limit V L The control target storage unit 402 stores the control target upper limit value V U [V] "6,600" and the control target lower limit V L [V] I remember it being "6,480."

[0026] In the example shown in FIG. 4, the control target memory unit 402 stores information indicating the control target range for the current day, but after the control target receiving unit 401 receives information indicating the control target range for the next day, it may store information indicating the control target ranges for both the current day and the next day.

[0027] Returning to FIG. 3, the control parameter receiving unit 403 receives the control parameters from the IED management system 300 and stores them in the control parameter storage unit 404. In this embodiment, the control parameter receiving unit 403 receives the control action time limit T L , control period (second period) T C , deviation resolution judgment voltage range ΔV S , control damping coefficient C, P sensitivity coefficient K P , Q sensitivity coefficient K Q and stores them in the control parameter storage unit 404. The control parameter storage unit 404 stores these control parameters.

[0028] 5 is a table showing an example of the contents stored in the control parameter storage unit 404 in this embodiment. L is the time limit from when the voltage falls outside the control target range to when voltage control is performed. Cis the period during which the IED 400 acquires the controllable amount, monitors the voltage, and controls the voltage. S is the voltage range used when determining that the deviation has been eliminated and attenuating the control amount. L +ΔV S )~(Control target upper limit V U -ΔV S The control damping coefficient C is a coefficient for gradually decreasing the control target after the deviation is resolved. The IED 400 determines the control amount by multiplying the control amount from one control cycle ago by the control damping coefficient C. P sensitivity coefficient K P is the voltage fluctuation range expected due to an increase or decrease in the effective power output of 1 kW. Q is the expected voltage fluctuation range due to an increase or decrease in reactive power output of 1 kvar.

[0029] For example, if the voltage of the distribution system is 6.6 kV, the sensitivity coefficient K P may be (line resistance R [Ω] from the distribution substation to the IED 400) / 6.6 [kV]. Similarly, the Q sensitivity coefficient K Q may be (the back impedance of the distribution transformer + the impedance of the distribution LRT (on-load tap changing transformer) + the line impedance from the distribution transformer to the IED 400) [Ω] / 6.6 [kV].

[0030] 3, the voltage effective value calculation unit 405 detects the voltage of the power distribution system at the installation location of the IED 400. In this embodiment, the voltage effective value calculation unit 405 detects this voltage by calculating the average of the three-phase voltage effective value for one second. The equipment storage unit 406 stores setting information of each of the distributed energy sources 500. Note that this setting information may be set from the IED management system 300.

[0031] 6 is a table showing an example of the contents stored in the equipment storage unit 406 in this embodiment. In the example shown in FIG. 6, the equipment storage unit 406 stores, as setting information for the first distributed energy source 500, No. "1", device name "A store BT", type "storage battery", PCS rating [kVA] "20", power factor constraint lead phase [%] "80" and lag phase [%] "95", power factor constraint lead phase [%] "80" and lag phase [%] "95", Q output limit capacitor [kvar] "8" and reactor [kvar] "8", and control priority active power "2" and reactive power "15" in association with each other.

[0032] Similarly, the equipment memory unit 406 stores, as setting information for the second distributed energy source 500, the No. "2", device name "A store EV", type "EV-PCS (Electric Vehicle-Power Conditioning Subsystem)", PCS rating [kVA] "30", power factor constraint during power generation leading phase [%] "0" and lagging phase [%] "0", power factor constraint during load leading phase [%] "0" and lagging phase [%] "0", Q output limit capacitor [kvar] "30" and reactor [kvar] "30", and control priority active power "1" and reactive power "10", in association with each other.

[0033] Returning to Fig. 3, the controllable amount receiving unit 407 acquires information indicating the controllable amount from the distributed energy source 500 connected to the power distribution system, and stores it in the controllable amount storage unit 408. In this embodiment, the information indicating the controllable amount includes at least information indicating the controllable amount in the power generation direction, information indicating the controllable amount in the load direction, information indicating the controllable amount in the capacitor direction, and information indicating the controllable amount in the reactor direction, but may include only some of these.

[0034] 7 is a table showing an example of the contents stored in the controllable amount storage unit 408 in this embodiment. In the example shown in FIG. 7, the controllable amount storage unit 408 stores, as information indicating the controllable amount of the first distributed energy source 500, No. "1", the active power "5" and reactive power "0" of the current output, the increase / decrease amount of the P power generation side output [kW] "15" and duration [s] "1800", the P load side output [kW] "25" and duration [s] "600", the Q capacitor side output [kvar] "2" and duration [s] "1800", and the Q reactor side output [kvar] "2" and duration [s] "600" in association with each other.

[0035] Here, the P power generation side output [kW] "15" of the increase / decrease amount is information indicating the controllable amount of the power generation direction. The P load side output [kW] "25" of the increase / decrease amount is information indicating the controllable amount of the load direction. The Q capacitor side output [kvar] "2" of the increase / decrease amount is information indicating the controllable amount of the capacitor direction. The Q reactor side output [kvar] "2" of the increase / decrease amount is information indicating the controllable amount of the reactor direction. Here, the power generation direction is the direction in which the distributed energy source 500 increases the active power supplied to the power distribution system. The load direction is the direction in which the distributed energy source 500 decreases the active power supplied to the power distribution system. The capacitor direction is the direction in which the distributed energy source 500 increases the reactive power supplied to the power distribution system. The reactor direction is the direction in which the distributed energy source 500 decreases the reactive power supplied to the power distribution system.

[0036] Similarly, the controllable quantity memory unit 408 stores, as information indicating the controllable quantity of the second distributed energy source 500, the No. "2", the current output active power "0" and reactive power "-10", the increase / decrease quantities P power generation side output [kW] "40" and duration [s] "3600", P load side output [kW] "20" and duration [s] "3600", Q capacitor side output [kW] "25" and duration [s] "3600", and Q reactor side output [kW] "25" and duration [s] "3600", in association with each other.

[0037] Returning to Fig. 3, the control amount calculation unit 409 judges whether or not the voltage detected by the voltage effective value calculation unit 405 deviates from the control target range stored in the control target storage unit 402. When it is judged that the voltage deviates, the control amount calculation unit 409 calculates control amounts for the multiple distributed energy sources 500 so that the voltage is within the range of the controllable amount stored in the controllable amount storage unit 408. In this embodiment, the control amount includes an amount indicating at least one of the control amount in the power generation direction, the control amount in the load direction, the control amount in the capacitor direction, and the control amount in the reactor direction.

[0038] The control amount transmission unit 410 transmits the control amount calculated by the control amount calculation unit 409 to the distributed energy source 500 of interest.

[0039] FIG. 8 is a schematic diagram for explaining the setting information of the distributed energy source 500 in this embodiment. In FIG. 8, the horizontal axis is active power (the power generation side is positive, and the load side is negative), and the vertical axis is reactive power (the capacitor side is positive, and the reactor side is negative). The PCS rating in FIG. 6 corresponds to the PCS rating PR in FIG. 8, and the radius of the PCS rating PR is determined by the value of the PCS rating. The leading phase of the power factor constraint during power generation in FIG. 6 corresponds to the leading phase constraint during power generation PPL in FIG. 8, and the central angle of the leading phase constraint during power generation PPL is determined by the leading phase value of the power factor constraint during power generation. The lagging phase of the power factor constraint during power generation in FIG. 6 corresponds to the lagging phase constraint during power generation PLL in FIG. 8, and the central angle of the lagging phase constraint during power generation PLL is determined by the lagging phase value of the power factor constraint during power generation.

[0040] The leading phase of the load power factor constraint in FIG. 6 corresponds to the loading power factor constraint RPL in FIG. 8, and the central angle of the loading power factor constraint RPL is determined by the leading phase value of the load power factor constraint. The lagging phase of the load power factor constraint in FIG. 6 corresponds to the loading power factor constraint RLL in FIG. 8, and the central angle of the loading power factor constraint RLL is determined by the lagging phase value of the load power factor constraint. The capacitor of the Q output limit in FIG. 6 corresponds to the capacitor side Q output limit CL in FIG. 8, and the vertical position of the capacitor side Q output limit CL is determined by the value of the Q output limit capacitor. The reactor of the Q output limit in FIG. 6 corresponds to the reactor side Q output limit RL in FIG. 8, and the vertical position of the reactor side Q output limit RL is determined by the value of the Q output limit reactor.

[0041] 9 is a time chart for explaining the operation of the IED 400 in this embodiment. C The IED400 performs voltage control every control period T C The IED 400 calculates the average of the three-phase average effective voltage values ​​at the installation location of the IED 400 during the one second (period P1) immediately before the control period T C In a period P2 immediately preceding the period, information indicating the controllable amount is obtained from each distributed energy source 500 (each facility).

[0042] And the control period T C When the period P1 starts, in the first period P3, the IED 400 performs a process of determining whether the average value of the three-phase average effective voltage calculated in the period P1 deviates from the control target range and a process of determining whether the deviation has been eliminated. In the following period P4, the IED 400 calculates the control amount of each facility. In the following period P5, the IED 400 transmits the control amount to each facility.

[0043] And the control period T C At the end of the period, for the next control cycle, the IED 400 calculates the average value of the three-phase average effective voltage value (period P6), and acquires information indicating the controllable amount from each piece of equipment (period P7). In this way, the detection of the voltage by the voltage effective value calculation unit 405, the calculation of the control amount by the control amount calculation unit 409, and the transmission of the control amount by the control amount transmission unit 410 are performed over a control period T C (second period). This control period T C is shorter than the first period, which is the period of the information indicating the control target range. Furthermore, in this embodiment, the controllable amount receiving unit 407 also acquires the information indicating the controllable amount at every second period, but the second period may be different from the second period.

[0044] 10 to 15 are flowcharts for explaining the operation of the control amount calculation unit 409 in this embodiment. The operation in FIG. 10 to FIG. 15 is performed in one control period T CFirst, the control amount calculation unit 409 calculates the average value V of the three-phase average voltage effective value calculated by the voltage effective value calculation unit 405. M Next, the control amount calculation unit 409 obtains this control period T C The upper limit of the control target V U The average value V M If it is determined that the upper limit deviation cumulative time V is larger (step Sa2-YES), the control amount calculation unit 409 U Timer control period T C Next, the control amount calculation unit 409 counts up the upper limit deviation cumulative time V U Timer is the control action time limit T L It is determined whether the control action time limit T L When it is determined that the upper limit deviation suppression control is in progress (step Sa4-YES), the control amount calculation unit 409 sets the upper limit deviation suppression control in progress flag V U Turn on CtFlg and proceed to step Sc1.

[0045] On the other hand, in step Sa2, the control target upper limit value V U The average value V M When it is determined that the upper limit deviation cumulative time V is not large (step Sa2-NO), the control amount calculation unit 409 U Timer control period T C Next, the control amount calculation unit 409 counts down the upper limit deviation cumulative time V U When the Timer value becomes negative, the upper limit deviation cumulative time V U The value of the timer is set to 0 (step Sa8).

[0046] In step Sa4, the upper limit deviation cumulative time V U Timer is the control action time limit T L If it is determined that the control period T C The lower limit V of the control target for the time slice to which L The average value V MIf it is determined that the lower limit deviation cumulative time V is small (step Sa9-YES), the control amount calculation unit 409 L Timer control period T C Next, the control amount calculation unit 409 counts up the lower limit deviation cumulative time V L Timer is the control action time limit T L It is determined whether the control action time limit T L When it is determined that the lower limit deviation suppression control is in progress (step Sa11-YES), the control amount calculation unit 409 sets the lower limit deviation suppression control in progress flag V L Turn on CtFlg and proceed to step Sd1.

[0047] On the other hand, in step Sa9, the control target lower limit V L The average value V M When it is determined that the lower limit deviation cumulative time V is not small (step Sa9-NO), the control amount calculation unit 409 L Timer control period T C Next, the control amount calculation unit 409 counts down the lower limit deviation cumulative time V L When the Timer value becomes negative, the cumulative time V L The timer value is set to 0 (step Sa15).

[0048] In step Sa11, the cumulative time of deviation from the lower limit V L Timer is the control action time limit T L When it is determined that the upper limit deviation suppression control is not greater than the upper limit deviation suppression control flag V U It is determined whether or not the upper limit deviation suppression control in progress flag V CtFlg is ON (step Sb1). U When it is determined that CtFlg is ON (step Sb1-YES), the control amount calculation section 409 proceeds to step Sb2.

[0049] In step Sb2, the control amount calculation unit 409 calculates the average value V Mis the control target upper limit V U Voltage range ΔV for determining deviation resolution S or the cumulative upper limit deviation time V U It is determined whether or not the condition that the Timer is 0 is satisfied. When it is determined in step Sb2 that the condition is not satisfied (step Sb2-NO), the control amount calculation unit 409 calculates the control period T C The process in is ended, and the output of each piece of equipment is maintained at the current state. Also, when it is determined in step Sb2 that the condition is satisfied (step Sb2-YES), the control amount calculation unit 409 proceeds to step Se1.

[0050] In step Sb1, the upper limit deviation suppression control in progress flag V U When it is determined that the CtFlg is not ON (step Sb1-NO), the control amount calculation unit 409 sets the lower limit deviation suppression control in progress flag V L It is determined whether or not the lower limit deviation suppression control in progress flag V L When it is determined that CtFlg is ON (step Sb3-YES), the control amount calculation section 409 proceeds to step Sb4.

[0051] In step Sb4, the control amount calculation unit 409 calculates the average value V M is the control target lower limit V L Voltage range for determining whether deviation has been resolved ΔV S or the cumulative time V L It is determined whether or not the condition that the Timer is 0 is satisfied. When it is determined in step Sb4 that the condition is not satisfied (step Sb4-NO), the control amount calculation unit 409 calculates the control period T C The process in is ended, and the output of each piece of equipment is maintained at the current state. Also, when it is determined in step Sb4 that the condition is satisfied (step Sb4-YES), the control amount calculation unit 409 proceeds to step Se1.

[0052] In step Sc1, the control amount calculation unit 409 calculates a sum Psum of the controllable amounts Pri in the load direction of each piece of equipment i and a sum Qsum of the controllable amounts Qri in the reactor direction of each piece of equipment i. Next, the control amount calculation unit 409 calculates the average value V of the three-phase average effective voltage value. M to the control target upper limit V U The sum Qsum minus the Q sensitivity coefficient K Q If it is determined that the condition is met (step Sc2-YES), the control amount calculation unit 409 sets the control amount change value ΔPm of the active power to 0. Furthermore, the control amount calculation unit 409 sets the control amount change value ΔQm of the reactive power to 0 by multiplying the average value V of the three-phase average effective voltage value. M to the control target upper limit V U The value obtained by subtracting Q The sign of the divided value is inverted (step Sc3), and the process proceeds to step Sf1.

[0053] On the other hand, when it is determined in step Sc2 that the condition is not satisfied (step Sc2-NO), the control amount calculation unit 409 calculates the average value V M to the control target upper limit V U The sum Qsum minus the Q sensitivity coefficient K Q The value multiplied by P and the total value Psum are added to the sensitivity coefficient K P If it is determined that the condition is met (step Sc4-YES), the control amount calculation unit 409 calculates the control amount change value ΔPm of the active power by multiplying the average value V of the three-phase average effective voltage. M to the control target upper limit V U Then, subtract the Q sensitivity coefficient K Q The value obtained by multiplying by and subtracting the value is the P sensitivity coefficient K P Furthermore, the controlled variable calculation unit 409 sets the controlled variable change value ΔQm for reactive power to the value obtained by inverting the sign of the sum value Qsum (step Sc5), and proceeds to step Sf1.

[0054] On the other hand, when it is determined in step Sc4 that the condition is not satisfied (step Sc4-NO), the control amount calculation unit 409 sets the control amount change value ΔPm for active power to the value obtained by inverting the sign of the total value Psum, and sets the control amount change value ΔQm for reactive power to the value obtained by inverting the sign of the total value Qsum (step Sc6), and proceeds to step Sf1.

[0055] In step Sd1, the control amount calculation unit 409 calculates the sum Psum of the controllable amounts Pgi in the power generation direction of each piece of equipment i and the sum Qsum of the controllable amounts Qci in the capacitor direction of each piece of equipment i. Next, the control amount calculation unit 409 calculates the control target lower limit V L to the average of the three-phase effective voltage V M The sum Qsum minus the Q sensitivity coefficient K Q If it is determined that the condition is met (step Sd2-YES), the control amount calculation unit 409 sets the control amount change value ΔPm for active power to 0. Furthermore, the control amount calculation unit 409 sets the control amount change value ΔQm for reactive power to 0 by multiplying it by the control target lower limit value V L to the average of the three-phase effective voltage V M The value obtained by subtracting Q (step Sd3), and then the process proceeds to step Sf1.

[0056] On the other hand, when it is determined in step Sd2 that the condition is not satisfied (step Sd2-NO), the control amount calculation unit 409 calculates the control target lower limit value V L to the average of the three-phase effective voltage V M The sum Qsum minus the Q sensitivity coefficient K Q The value multiplied by P and the total value Psum are added to the sensitivity coefficient K P If it is determined that the condition is met (step Sd4-YES), the control amount calculation unit 409 calculates the control amount change value ΔPm of the active power by multiplying the control target lower limit value V L to the average of the three-phase effective voltage V M Then, subtract the Q sensitivity coefficient K QThe value obtained by multiplying by and subtracting the value is the P sensitivity coefficient K P Furthermore, the control amount calculation unit 409 sets the control amount change value ΔQm of the reactive power as the sum value Qsum (step Sd5), and proceeds to step Sf1.

[0057] On the other hand, when it is determined in step Sd4 that the condition is not satisfied (step Sd4-NO), the control amount calculation unit 409 sets the control amount change value ΔPm for active power to the sum value Psum, and sets the control amount change value ΔQm for reactive power to the sum value Qsum (step Sd6), and proceeds to step Sf1.

[0058] Also, in step Se1, the control amount calculation unit 409 sets the control amount change value ΔPm for active power to a value obtained by multiplying the total control amount Pm' of active power one control cycle ago by a value obtained by subtracting 1 from the control damping coefficient C, and sets the control amount change value ΔQm for reactive power to a value obtained by multiplying the total control amount Qm' of reactive power one cycle ago by a value obtained by subtracting 1 from the control damping coefficient C. Next, the control amount calculation unit 409 determines whether the absolute value of the value obtained by adding the control amount change value ΔPm to the total control amount Pm' of active power one control cycle ago is equal to or smaller than a predetermined threshold value (e.g., 10 [kW]) (step Se2).

[0059] If it is determined that the control amount is equal to or less than the threshold (step Se2-YES), the control amount calculation unit 409 sets the control amount change value ΔPm of the active power to a value obtained by inverting the sign of the total control amount Pm' of the active power one control cycle ago (step Se3). Next, or if it is determined in step Se2 that the control amount is not equal to or less than the threshold (step Se2-NO), the control amount calculation unit 409 determines whether or not the absolute value of the value obtained by adding the control amount change value ΔQm to the total control amount Qm' of the reactive power one control cycle ago is equal to or less than a predetermined threshold (e.g., 10 [kvar]) (step Se4).

[0060] If it is determined that the control amount is equal to or less than the threshold (step Se4-YES), the control amount calculation unit 409 sets the control amount change value ΔQm of reactive power to a value obtained by inverting the sign of the total control amount Qm' of reactive power one control cycle ago (step Se5). Next, or if it is determined in step Se4 that the control amount is not equal to or less than the threshold (step Se4-NO), the control amount calculation unit 409 determines whether or not the condition that the control amount change value ΔPm of active power is a value obtained by inverting the sign of the total control amount Pm' of active power one control cycle ago and the control amount change value ΔQm of reactive power is a value obtained by inverting the sign of the total control amount Qm' of reactive power one control cycle ago is satisfied (step Se6).

[0061] When it is determined that the condition is satisfied (step Se6-YES), the control amount calculation unit 409 sets the upper limit deviation suppression control in progress flag V U CtFlg and lower limit deviation suppression control in progress flag V L CtFlg is turned OFF (step Se7), and the process proceeds to step Sf 1. If it is determined that the condition is not satisfied (step Se6-NO), the control amount calculation unit 409 proceeds to step Sf 1.

[0062] In step Sf1, the control amount calculation unit 409 determines the total control amount Pm of active power as the sum of the total control amount Pm' of active power one control cycle ago and the control amount change value ΔPm of active power, and determines the total control amount Qm of reactive power as the sum of the total control amount Qm' of reactive power one control cycle ago and the control amount change value ΔQm of reactive power. Next, the control amount calculation unit 409 determines whether the total control amount Pm of active power is 0 (step Sf2).

[0063] When it is determined that the total control amount Pm of the active power is not 0 (step Sf2-NO), the control amount calculation unit 409 selects the equipment i with the highest priority among the equipment i to which the control amount of the active power is not assigned (step Sf3). Next, the control amount calculation unit 409 sets the control amount Pi of the active power of the selected equipment i to the one with the smaller absolute value between the total control amount Pm of the active power and the controllable amount of the active power of the equipment i, decrements the value of the total control amount Pm of the active power by the control amount Pi of the active power of the equipment i (step Sf4), and returns to step Sf2. Here, when the total control amount Pm of the active power is positive, the output of the P power generation side is used as the controllable amount of the active power of the equipment i. On the other hand, when the total control amount Pm of the active power is negative, the output of the P load side is used as the controllable amount of the active power of the equipment i.

[0064] On the other hand, when it is determined in step Sf2 that the total control amount Pm of the active power is 0 (step Sf2-YES), the control amount calculation unit 409 determines whether the total control amount Qm of the reactive power is 0 or not (step Sf5).

[0065] When it is determined that the total control amount Qm of reactive power is not 0 (step Sf5-NO), the control amount calculation unit 409 selects the equipment i with the highest priority among the equipment i to which the control amount of reactive power is not assigned (step Sf6). Next, the control amount calculation unit 409 determines the control amount Qi of reactive power of the selected equipment i to be the one with the smaller absolute value among the total control amount Qm of reactive power and the controllable amount of reactive power of the equipment i, decrements the value of the total control amount Qm of reactive power by the control amount Qi of reactive power of the equipment i (step Sf7), and returns to step Sf5. Here, when the total control amount Qm of reactive power is positive, the output of the Q capacitor side is used as the controllable amount of reactive power of the equipment i. Also, when the total control amount Qm of reactive power is negative, the output of the Q reactor side is used as the controllable amount of reactive power of the equipment i.

[0066] On the other hand, when it is determined in step Sf5 that the total control amount Qm of the reactive power is 0 (step Sf5-YES), the control amount calculation unit 409 instructs the control amount transmission unit 410 to transmit the control amounts Pi and Qi (step Sf8).

[0067] The present disclosure may also be embodied as follows. (1) One embodiment is an intelligent electronic device installed in a power distribution system, comprising: a control target acquisition unit that acquires information indicating a control target range from a voltage management system; a voltage detection unit that detects the voltage of the power distribution system at a location where the intelligent electronic device is installed; a controllable quantity acquisition unit that acquires information indicating a controllable quantity from a distributed energy source connected to the power distribution system; a control quantity calculation unit that calculates a control quantity for the distributed energy source so that the voltage detected by the voltage detection unit is within the control target range when it is determined that the voltage detected by the voltage detection unit deviates from the control target range, and a control quantity transmission unit that transmits the control quantity calculated by the control quantity calculation unit to the distributed energy source.

[0068] This allows the intelligent electronic device to control the distributed energy sources to control the voltage of the power grid in response to sudden load changes or fluctuations in the output of renewable energy.

[0069] (2) Another embodiment is an intelligent electronic device as described in (1), wherein the information indicating the control target range includes information indicating a control target range for each predetermined first period, and the detection of the voltage by the voltage detection unit, the calculation of the control amount by the control amount calculation unit, and the transmission of the control amount by the control amount transmission unit are performed for each predetermined second period that is shorter than the first period.

[0070] This allows the intelligent electronic device to control the distributed energy sources at a second period of the control target range that is shorter than the first period.

[0071] (3) Another embodiment is the intelligent electronic device according to (2), in which the controllable amount acquisition unit acquires information indicating the controllable amount every second period.

[0072] This allows the intelligent electronic device to perform control according to the state of the distributed energy resource at a second period that is shorter than the first period of the control target range.

[0073] (4) Another embodiment is an intelligent electronic device described in any one of (1) to (3), wherein the control amount calculated by the control amount calculation unit includes at least one of a control amount in the power generation direction, a control amount in the load direction, a control amount in the capacitor direction, and a control amount in the reactor direction.

[0074] This allows the intelligent electronics device to control the distributed energy resources in a generating, load, capacitor or reactor direction.

[0075] (5) Another embodiment is a voltage control system comprising: an intelligent electronic device installed in a power distribution system; and a voltage management system that transmits information indicating a control target range to the intelligent electronic device. The intelligent electronic device comprises: a control target acquisition unit that acquires information indicating the control target range from the voltage management system; a voltage detection unit that detects the voltage of the power distribution system at a location where the intelligent electronic device is installed; a controllable quantity acquisition unit that acquires information indicating a controllable quantity from a distributed energy source connected to the power distribution system; a control quantity calculation unit that calculates a control quantity for the distributed energy source so that the voltage detected by the voltage detection unit is within the range of the controllable quantity when it is determined that the voltage detected by the voltage detection unit deviates from the control target range; and a control quantity transmission unit that transmits the control quantity calculated by the control quantity calculation unit to the distributed energy source.

[0076] This enables the voltage control system to control the distributed energy sources and control the voltage of the power distribution system in response to sudden load fluctuations or output fluctuations of renewable energy.

[0077] (6) Another embodiment is a voltage control system according to (5), comprising the distributed energy source.

[0078] (7) Another embodiment is a voltage control method by an intelligent electronic device installed in a power distribution system, the voltage control method including a first step of acquiring information indicating a target control range from a voltage management system, a second step of detecting a voltage of the power distribution system at a location where the intelligent electronic device is installed, a third step of acquiring information indicating a controllable amount from a distributed energy source connected to the power distribution system, a fourth step of calculating a control amount for the distributed energy source so that the voltage detected in the second step is within the range of the controllable amount if it is determined that the voltage detected in the second step deviates from the target control range, and a fifth step of transmitting the control amount calculated in the fourth step to the distributed energy source.

[0079] As a result, the voltage control method can control the distributed energy sources to control the voltage of the power distribution system in response to sudden load fluctuations or output fluctuations of renewable energy.

[0080] 1 may be recorded on a computer-readable recording medium, and the programs recorded on the recording medium may be read into a computer system and executed to realize the voltage management system 100, the IED management system 300, and the IED 400. Note that the term "computer system" here includes hardware such as an OS and peripheral devices.

[0081] In addition, "computer-readable recording medium" refers to portable media such as flexible disks, optical magnetic disks, ROMs, and CD-ROMs, and storage devices such as hard disks built into computer systems. Furthermore, "computer-readable recording medium" also includes those that dynamically hold a program for a short period of time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line, and those that hold a program for a certain period of time, such as volatile memory inside a computer system that is the server or client in such cases. Furthermore, the above program may be one that realizes part of the above-mentioned functions, or may be one that can realize the above-mentioned functions in combination with a program already recorded in the computer system.

[0082] Although the embodiment of this disclosure has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like are also included within the scope that does not depart from the gist of this disclosure. [Explanation of symbols]

[0083] 10. Voltage Control System 100 Voltage Management System 200 SVR 300 IED Management System 400 IED 401 Control target receiver 402 Control target memory unit 403 Control parameter receiver 404 Control parameter storage unit 405 Voltage Effective Value Calculation Unit 406 Equipment storage section 407 Controllable quantity receiving unit 408 Controllable amount memory unit 409 Control amount calculation unit 410 Control amount transmission unit 500 Distributed Energy Sources

Claims

1. An intelligent electronic device for installation in an electrical distribution system, comprising: a control target acquisition unit that acquires information indicating a control target range from a voltage management system; a voltage detection unit for detecting a voltage of the power distribution system at a location where the intelligent electronic device is installed; a controllable amount acquisition unit that acquires information indicating a controllable amount from a distributed energy source connected to the power distribution system; a control amount calculation unit that calculates a control amount for the distributed energy source so that the voltage detected by the voltage detection unit is within the controllable amount range when it is determined that the voltage detected by the voltage detection unit deviates from the target control range; a control amount transmission unit that transmits the control amount calculated by the control amount calculation unit to the distributed energy source; Equipped with The intelligent electronic device, wherein the controlled variable includes reactive power and active power of the distributed energy source, and among the reactive power and the active power, the reactive power is given priority.

2. the information indicating the control target range includes information indicating a control target range for each setting period of a setting value of an automatic voltage regulator installed in the power distribution system, the first period being a predetermined first period; 2. The intelligent electronic device of claim 1, wherein the detection of the voltage by the voltage detection unit, the calculation of the control amount by the control amount calculation unit, and the transmission of the control amount by the control amount transmission unit are performed every predetermined second period that is shorter than the first period.

3. 3. The intelligent electronic device according to claim 2, wherein the controllable amount acquisition unit acquires information indicating the controllable amount every second period.

4. 4. The intelligent electronic device according to claim 1, wherein the control amount calculated by the control amount calculation unit includes at least one of a control amount in a power generation direction, a control amount in a load direction, a control amount in a capacitor direction, and a control amount in a reactor direction.

5. 1. A voltage control system comprising: an intelligent electronic device installed in the power distribution system; a voltage management system that transmits information to the intelligent electronic device indicative of a control target range; Equipped with The intelligent electronic device comprises: a control target acquisition unit that acquires information indicating the control target range from the voltage management system; a voltage detection unit for detecting a voltage of the power distribution system at a location where the intelligent electronic device is installed; a controllable amount acquisition unit that acquires information indicating a controllable amount from a distributed energy source connected to the power distribution system; a control amount calculation unit that calculates a control amount for the distributed energy source so that the voltage detected by the voltage detection unit is within the controllable amount range when it is determined that the voltage detected by the voltage detection unit deviates from the target control range; a control amount transmission unit that transmits the control amount calculated by the control amount calculation unit to the distributed energy source; Equipped with A voltage control system, wherein the controlled variable includes reactive power and active power of the distributed energy source, and of the reactive power and the active power, the reactive power is given priority.

6. The voltage control system of claim 5 comprising the distributed energy source.

7. A method for controlling voltage by an intelligent electronic device installed in a power distribution system, comprising: A first step of acquiring information indicating a control target range from a voltage management system; a second step of detecting a voltage of the power grid at a location of the intelligent electronic device; a third step of obtaining information indicative of a controllable quantity from a distributed energy source connected to the power grid; a fourth step of calculating a control amount for the distributed energy source when it is determined that the voltage detected in the second step deviates from the target control range so that the voltage is within the range of the controllable amount; a fifth step of transmitting the control amount calculated in the fourth step to the distributed energy source; having A voltage control method, wherein the controlled variable includes reactive power and active power of the distributed energy source, and of the reactive power and the active power, the reactive power is given priority.

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