JP6547421B2 - Control device, control method of control device and program - Google Patents

Description

  The present invention relates to a control device, a control method of the control device, and a program.

  Power on the power grid changes in frequency, voltage, etc. when the balance between supply and demand is lost. Therefore, the power company predicts the amount of power demand on a daily basis, and controls the amount of power generation at the power plant so as to maintain the balance between supply and demand.

  On the other hand, in recent years, large-scale distributed power sources using natural energy such as mega-solar solar power generation facilities and large-scale wind power plants have been installed in various places and are starting to operate one after another.

  And the technique for equalizing the electric power generation amount from such a distributed power supply is also developed (for example, refer patent document 1).

JP, 2006-226189, A

  However, as the ratio of power supply from the distributed power source to the power system increases, not only adjustment of the power generation capacity of the power plant, but also an operation of disconnecting the distributed power source from the power system depending on the situation is considered. ing.

  On the other hand, when the distributed power supply is disconnected from the power system, if the amount of power supplied to the power system changes rapidly, the voltage and frequency change significantly, and the quality of the power provided to the consumer can be degraded. Sex is also assumed.

  The present invention has been made in view of the above problems, and it is an object of the present invention to reduce the influence on a power system when controlling a distributed power supply.

The control device according to one aspect is a control device that controls a plurality of distributed power sources installed in an electric power system, and a power generation amount acquisition unit that acquires the amount of generated power of each of the distributed power sources, and the power system Based on the result of comparison of the system state acquisition unit for acquiring a measurement value that fluctuates according to the state of the power of the power system from the measurement device installed in the device, the measurement value, and the target value of the measurement value According to the distributed type, the control amount calculating unit for obtaining the suppressed amount of the power generation amount by the distributed power source, and the distributed type to be disconnected from the power system based on the respective power generation amount of the distributed power source and the suppressed amount. A disconnection selection unit for selecting a power supply, and a disconnection execution unit for transmitting a disconnection command for disconnecting the distributed power source selected as a disconnection target from the electric power system to the distributed power supply for the disconnection target When each of the plurality of distributed power sources With stomach of maximum suppression time is the maximum value of the total time of disconnection in a predetermined period of, and the total suppression time, was recorded table is already total time Kairetsu in the predetermined period, the The paring selector selects the decentralized power from the electric power system so that the ratio between the maximum suppression time and the total suppression time becomes equal when selecting the decentralized power supplies to be decentralized. The parallel-off execution unit sequentially transmits the parallel-out instruction to each of the distributed power sources to be parallel-connected when there are a plurality of distributed power sources to be parallel-connected. .

  In addition, the problems disclosed in the present application and the solution methods thereof will be clarified by the description of the section of the mode for carrying out the invention, the description of the drawings, and the like.

  It is possible to reduce the influence on the power system when controlling the distributed power source.

It is a figure showing the electric power system concerning this embodiment. It is a figure showing a system control device concerning this embodiment. It is a figure showing the storage device concerning this embodiment. It is a figure which shows the distributed power supply information table which concerns on this embodiment. It is a figure which shows the suppression return management table which concerns on this embodiment. It is a flowchart which shows the flow of the process which concerns on this embodiment.

  At least the following matters will be made clear by the present specification and the description of the accompanying drawings.

  The entire configuration of a power system 1000 according to the present embodiment is shown in FIG. The power system 1000 according to the present embodiment is configured as a transmission system as an example, and includes a power plant 500 and a power transmission line 700 extended from the power plant 500. In the power transmission line 700, a plurality of distributed power sources (a plurality of solar power generation facilities 200 in the present embodiment) are installed. Although not shown in FIG. 1, the power transmission line 700 is provided with various substations such as a primary substation and a secondary substation.

  The power plant 500 is a power plant capable of controlling the amount of power generation by controlling the amount of energy used for power generation, such as a hydroelectric power plant, a thermal power plant, a nuclear power plant, etc. The supplied power is supplied to the transmission line 700 through the bus 520 and the protection device 530. For example, when a current equal to or greater than a specified value flows, the protection device 530 shuts off the electric path, and stops the power supply from the power plant 500 to the transmission line 700.

  The generator 510 and the protection device 530 according to the present embodiment are provided with measuring instruments (not shown) capable of measuring physical quantities, such as voltage, current, frequency, power factor, etc., which fluctuate according to the state of the power system 1000. The information is transmitted to the grid control apparatus 100 communicably connected at any time.

  The solar power generation facility 200 is configured to include a solar panel 220 and a power conditioning system (PCS) 210. The amount of power generation by the solar power generation facility 200 fluctuates depending on the amount of solar radiation.

  The power generated by the solar power generation facility 200 is consumed by a load on the premises (not shown) that receives the power supply from the solar power generation facility 200, while being supplied to the transmission line 700 through the PCS 210 when surplus power is generated. Be done.

  For this reason, the power generator 510 is not limited to the power demand that fluctuates depending on the daily weather conditions and the time zone, but also the power generation amount of the solar power generation facility 200 Furthermore, the power quality (eg, voltage, frequency, power factor, etc.) in power system 1000 is properly maintained (within a prescribed range) while properly considering the fluctuation of these transitions). , Control the amount of power generation.

  The PCS 210 can switch between parallel connection and parallel connection to the power system 1000, and disconnects the solar power generation facility 200 from the power system 1000, for example, when an accident occurs in the solar power generation facility 200 or the transmission line 700. The PCS 210 also parallels or disconnects the photovoltaic power generation facility 200 to the power system 1000 according to a command (parallel command, disconnection command) transmitted from the grid control device 100 communicably connected.

  The PCS 210 also has a measuring instrument capable of measuring the amount of power generation of the solar power generation facility 200, and transmits it to the grid control device 100 as needed (for example, every 10 minutes).

  The grid control device 100 is a device (control device) that controls a plurality of solar power generation facilities 200 provided in the power grid 1000.

  For example, as described above, the grid control device 100 fluctuates according to the power status of the power grid 1000, such as voltage, current, frequency, power factor, etc., from the measuring device installed in the generator 510, the protection device 530, etc. When acquiring the physical quantity to be measured (measurement value) and disconnecting the photovoltaic power generation facility 200 from the power system 1000, the disconnection command is transmitted to the photovoltaic power generation facility 200 to be disconnected.

  Moreover, the grid control apparatus 100 transmits parallel instruction | command to the solar power generation installation 200 of reset object, when paralleling the solar power generation installation 200 in parallel with the electric power grid | system 1000.

  Next, a configuration of the system control device 100 according to the present embodiment is shown in FIG.

  The system control device 100 includes a central processing unit (CPU) 110, a memory 120, a communication device 130, a storage device 140, an input device 150, an output device 160, and a recording medium reading device 170.

  The CPU 110 is responsible for overall control of the system control device 100, and realizes various functions as the system control device 100 by reading out the control program 600 stored in the storage device 140 to the memory 120 and executing it. For example, a power generation acquisition unit, a system state acquisition unit, a suppression amount calculation unit, a parallel selection unit, a parallel execution unit, an increase calculation unit, a parallel selection unit, and a parallel execution unit are realized.

  The recording medium reading device 170 is a device for reading and writing the control program 600 recorded on the recording medium 800 and various data. The read control program 600 and data are stored in the memory 120 and the storage device 140.

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

  The input device 150 is a device used for data input to the system control device 100 by an operator or the like, and functions as a user interface. As the input device 150, for example, a keyboard or a mouse can be used.

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

  The communication device 130 is a device for performing communication. The communication device 130 receives data such as various measurement values and the amount of generated power sent from, for example, the generator 510, the protection device 530, and the PCS 210. Also, the communication device 130 transmits a disconnection instruction and a parallel instruction to the PCS 210. Furthermore, the communication device 130 may be communicably connected to another computer via a communication network such as the Internet.

  The storage device 140 is configured of, for example, a hard disk device. As shown in FIG. 3, the storage device 140 stores a control program 600, a distributed power supply information table (distribution availability table) 610, and a suppression / restoration management table 620.

  A distributed power source information table 610 according to the present embodiment is shown in FIG. The distributed power supply information table 610 includes an “identification information” field, an “installation location” field, a “power generation amount” field, a “suppression control availability” field, a “maximum suppression time” field, and a “total suppression time” field.

  In the “identification information” column, identification information of the photovoltaic power generation facility 200 is described.

  In the “Installation location” column, information specifying the installation location of the solar power generation facility 200 in the power system 1000 is described.

  In the “power generation amount” column, in the present embodiment, the current power generation amount (latest power generation amount) of the solar power generation facility 200 transmitted from the PCS 210 is described. The power generation amount described in the power generation amount column is an average value of the power generation amount in the most recent predetermined period (for example, one hour) in the past, or a predicted value of the power generation amount after a predetermined period from the present (for example, one hour). It may be.

  In the column of “suppression control availability”, suppression control availability information indicating whether or not the grid control device 100 can be selected as a disconnection target when the grid control device 100 attempts to disconnect the solar power generation facility 200 from the power system 1000 is displayed. It is recorded. For example, whether or not the suppression control is performed is negotiated by a contract exchanged between a manager such as a power company who manages the grid control device 100 and a manager of the solar power generation facility 200. If the suppression control availability information is "OK", it indicates that it may be selected as a disconnection target, and if "NO", it indicates that it is not selected as a disconnection target.

  As described above, the operation policy of each photovoltaic power generation facility 200 is recorded by recording information indicating the possibility of selection as a disconnection target for each of the plurality of photovoltaic power generation facilities 200 installed in the power system 1000. It is possible to respond appropriately according to

  In the "maximum suppression time" column, when the suppression control availability information is "OK", the maximum value of the total time of disconnection in a predetermined period (for example, a period of the past one month) is recorded. This maximum curtailment time is also negotiated by a contract exchanged between the power company and the manager of the solar power plant 200.

  In the "total suppression time" column, the total of the times already separated in the predetermined period (cumulative accumulated time) is described.

  The grid control device 100 according to the present embodiment, as an example, selects each of the solar power generation facilities 200 whose suppression control availability information is “OK” when selecting the solar power generation facility 200 to be separated from the electric power grid 1000. , And the ratio of the maximum suppression time to the total suppression time is equal. Specifically, the grid control device 100 preferentially selects the photovoltaic power generation facility 200 having a small total suppression time / maximum suppression time value as a disconnection target. According to such an aspect, each photovoltaic power generation facility 200 can be equally disconnected from the power grid 1000 within the range of the maximum suppression time by the contract between the power company and the management company of the photovoltaic power generation facility 200. It becomes.

  Next, a suppression and return management table 620 according to the present embodiment is shown in FIG. The suppression return management table 620 includes a “suppression order” column, a “suppression target” column, a “estimated suppression amount” column, a “return order” column, and a “suppressing” column.

  In the “suppression order” column, information indicating the order at the time of disconnection is assigned, which is assigned to the solar power generation facility 200 selected as a disconnection target by the grid control device 100 is described. In the present embodiment, each solar power generation facility 200 is sequentially disconnected from the solar power generation facility 200 to which the suppression order is assigned to 1 earlier.

  As described above, by sequentially disconnecting the photovoltaic power generation facility 200, it is possible to control the plurality of photovoltaic power generation facilities 200 not to be simultaneously disconnected from the power grid 1000 at one time. Can be suppressed to prevent the deterioration of the power quality.

  In the “suppression target” column, identification information of the photovoltaic power generation equipment 200 assigned to each suppression order is described.

  The amount of decrease in the amount of power supplied to the electric power system 1000 which is estimated by disconnecting the photovoltaic power generation facility 200 from the electric power system 1000 is described in the “estimated suppression amount” column. For example, the amount of power generation described in the “amount of power generation” column of the distributed power source information table 610 is described as the expected amount of suppression.

  In the “restoration order” column, the priority in the case of interconnecting the photovoltaic power generation facility 200 once disconnected from the power grid 1000 to the power grid 1000 is described. For example, it may be determined that the photovoltaic power generation equipment 200 that has been disconnected in advance is in parallel. According to such an aspect, it is possible to fairly perform parallel connection and parallel control with respect to each photovoltaic power generation facility 200. In the example illustrated in FIG. 5, the restoration order is determined for the two photovoltaic power generation facilities 200 specified by “B” and “F” in the power disconnection from the power system 1000.

  In addition, although it mentions later, every time the grid control device 100 parallels one solar power generation facility 200 to the power grid 1000, in the case of controlling so as to select one solar power generation facility 200 to be paralleled next, The return order is determined each time one solar power generation facility 200 is selected as a parallel target.

  Information indicating whether the solar power generation facility 200 listed in the suppression recovery management table 620 is currently being interconnected to the power system 1000 or being disconnected is described in the “suppressing” column. Ru.

  In the example illustrated in FIG. 5, the photovoltaic power generation facility 200 specified by “B” “F” “A” is selected as a disconnection target from power system 1000, and among them, “B The solar power generation facility 200 specified by the second place “F” is already disconnected from the power system 1000, and the solar power generation facility 200 specified by the third place “A” in the suppression order. Indicates that the power system 1000 is still connected and not disconnected.

  In this state, when it is determined that further suppression of power supply to power system 1000 is necessary, grid control apparatus 100 is in linkage with power system 1000, and the suppression order is “third”. A disconnection command is transmitted to the photovoltaic power generation facility 200 specified by A, and the power grid 1000 is disconnected.

  Conversely, when it is determined that the increase of the power supply to power system 1000 is necessary in this state, grid control apparatus 100 is in the process of being disconnected from power system 1000 and has the first recovery rank. The parallel command to the power system 1000 is transmitted to the photovoltaic power generation facility 200 specified by “B”, and is paralleled to the power system 1000.

  Next, referring to the flowchart illustrated in FIG. 6, the flow of processing when the grid control device 100 according to the present embodiment controls disconnection and parallel connection to a plurality of photovoltaic power generation facilities 200 installed in the power grid 1000. While explaining.

  First, the grid control device 100 initializes the suppression control flag to 0 (S1000). The suppression control flag is 1 when the grid control device 100 performs parallel connection to at least one solar power generation facility 200 installed in the electric power grid 1000, and for any solar power generation facility 200 Even if the paralleling is not performed (all connected), it becomes 0.

  Subsequently, the grid control device 100 acquires grid information (S1010). Specifically, the grid control device 100 acquires the amount of power generation (for example, the present amount of power generation here) from each of the photovoltaic power generation facilities 200 installed in the power grid 1000, and the distributed power source information table 610. And measurement values (voltage, current, frequency, power factor, etc.) that change according to the state of the power of the power system 1000 from the measuring devices installed in the generator 510, the protection device 520, etc. .

  Then, grid control device 100 compares the measured value with the target value (in the example shown in FIG. 6, the range from the second determination value to the first determination value becomes the target value), and supplies the amount of power supplied to power system 1000. It is determined whether to suppress, increase or do nothing (S1030).

  For example, when the frequency of the generator 510 is higher than the target value, or when the voltage of the power system 1000 is higher than the target value, the amount of supplied power is excessive for the power demand, so the grid control device 100 determines that the amount of power supplied to power system 1000 is to be suppressed. Conversely, when the frequency of the generator 510 is lower than the target value, or when the voltage of the power grid 1000 is lower than the target value, the amount of supplied power is insufficient for the power demand, so the grid control device 100 determines that the amount of power supplied to power system 1000 is to be increased.

  In the example illustrated in FIG. 6, when the measured value (for example, the frequency of the generator 510) is larger than the first determination value, the grid control device 100 is out of the range of the target value, and the power to the power grid 1000 is obtained. It is determined that the supply amount is to be suppressed.

  In S1030, grid control device 100 calculates an index value indicating the balance of power supply and demand of power system 1000 based on the above measured value, and compares this index value with a target value to obtain power system 1000. It may be determined whether to suppress or increase the power supply amount of the In this case, this index value can be, for example, the frequency fluctuation and operation reserve power of the generator 510 due to the power fluctuation amount in a relatively short time, or the voltage or frequency staying rate of the power grid 1000 for a relatively long time. .

  When the grid control device 100 determines that the power supply amount to the power grid 1000 is to be suppressed, the grid control device 100 sets the suppression control flag to 1 (S1050), and causes the photovoltaic power generation facility 200 to be disconnected from the power grid 1000. After the selection, the suppression return management table 620 is created (S1060).

  At this time, the grid control device 100 first determines the amount of power supply to be reduced by the photovoltaic power generation facility 200 (the amount of suppression of the amount of power generation by the distributed power source) based on the above measured value, and then this suppression amount In order to reduce the power supply for 1 minute, the solar power generation facility 200 to be disconnected from the power system 1000 is selected.

  More specifically, while referring to the distributed power supply information table 610 shown in FIG. The combination of the solar power generation equipment 200 which can reduce the corresponding electric power is selected based on the power generation amount of each of the solar power generation equipment 200. For example, when the amount of suppression is 20 MW (megawatts), the difference between the total value of the current power generation amount of the solar power generation facility 200 selected as a disconnection target and 20 MW as the amount of suppression is equal to or less than a predetermined value Elect to be ± 5 MW). According to such an aspect, it is possible to maintain the state of power in power system 1000 with high accuracy.

  In addition, at that time, the grid control device 100 selects the photovoltaic power generation facility 200 to be the disjunction target so that the ratio of the maximum suppression time to the total suppression time becomes equal.

  Specifically, the grid control apparatus 100 gives priority (suppression priority) so that the photovoltaic power generation facility 200 with a smaller value of total suppression time / maximum suppression time is preferentially disconnected from the electric power system 1000. elect.

  After that, the system control apparatus 100 creates the suppression / return management table 620 as shown in FIG. 5, for example (S1060).

  Subsequently, the grid control device 100 transmits a disconnection instruction for causing the power system 1000 to disconnect from the power system 1000 to the PCS 210 of the photovoltaic power generation facility 200 of each disconnection target according to the suppression order of the suppression and recovery management table 620 (S 1070 ). At this time, when there are a plurality of photovoltaic power generation facilities 200 to be disconnected, the grid control device 100 sequentially transmits a disconnection command to each of the photovoltaic power generation facilities 200 to be disconnected.

  Specifically, the grid control device 100 first transmits a disconnection instruction to the photovoltaic power generation facility 200 specified by “B”, which is the first in the suppression order, according to the suppression and return management table 620 of FIG. 5. Then, the grid control device 100 writes “Y” in the suppression column and stands by for a predetermined time (for example, 5 minutes) (S1080).

  Then, the grid control device 100 acquires the grid information (new measurement value) again (S1010), and if the new measurement value (frequency of the generator 510) is still larger than the first determination value, the grid The control device 100 determines that the photovoltaic power generation facility 200 having the next priority is to be disconnected from the power system 1000 (S1030).

  Then, since the system control device 100 sets the suppression control flag = 1 (S1040), the system control device 100 executes the processing of S1070, and is specified by “F” according to the next suppression rank (second rank) of the suppression and return management table 620. A disconnection instruction for causing the power system 1000 to decouple is transmitted to the PCS 210 of the photovoltaic power generation facility 200.

  According to such an aspect, since it is possible to control so that the plurality of photovoltaic power generation facilities 200 are not simultaneously disconnected from the power grid 1000, the influence on the power grid 1000 is suppressed and it is possible to prevent the quality degradation of power. Become. In addition, when each photovoltaic power generation facility 200 is sequentially disconnected from the power grid 1000, the solar power generation facility 200 is disconnected from the power grid 1000 every time it is separated from the power grid 1000 by leaving an interval of a predetermined time or more. Since it is possible to determine whether or not the next solar power generation facility 200 should be disconnected after waiting for the fluctuating power system 1000 state to stabilize, the influence on the power system 1000 is further suppressed, It becomes possible to prevent the quality deterioration of electric power.

  On the other hand, if the measured value is less than the second determination value as a result of comparing the measured value with the target value (in the example shown in FIG. 6, the range between the second determination value and the first determination value) in S1030, The grid control device 100 determines to increase the amount of power supplied to the power grid 1000 (S1030).

  Then, in this case, the grid control device 100 proceeds with the process to S1090. Then, if the suppression control flag is 0, the grid control device 100 proceeds to S1080 because there is no solar power generation facility 200 during disconnection, and if the suppression control flag is 1, the suppression return With reference to the management table 620, the photovoltaic power generation equipment 200 to be restored to the power system 1000 is selected from among the photovoltaic power generation equipment 200 during disconnection.

  At this time, the grid control device 100 first determines the amount of power supply to be increased by the photovoltaic power generation facility 200 (the amount of increase in the amount of power generation by the distributed power source) based on the above measured value, and then this increase In order to increase the power supply for 1 minute, a solar power generation facility 200 to be paralleled to the power system 1000 is selected.

  More specifically, the grid control device 100 applies the distributed power source shown in FIG. 4 to the photovoltaic power generation facility 200 during disconnection (during suppression) described in the suppression / return management table 620 of FIG. 5. While referring to the information table 610, the combination of the solar power generation facilities 200 capable of increasing the power corresponding to the above-mentioned increase amount is selected based on the power generation amount of each solar power generation facility 200. For example, when the increase amount is 20 MW (megawatts), the difference between the total value of the current power generation amounts of the photovoltaic power generation facilities 200 selected as parallel targets and 20 MW which is the increase amount is equal to or less than a predetermined value Elect to be 5 MW). According to such an aspect, it is possible to maintain the state of power in power system 1000 with high accuracy.

  Further, at that time, the grid control device 100 selects the photovoltaic power generation facilities 200 to be parallel targets so that the ratio between the maximum suppression time and the total suppression time becomes equal.

  Specifically, the grid control apparatus 100 gives priority (restoration rank) and selects the solar power generation equipment 200 with a larger value of total suppression time / maximum suppression time in parallel to the electric power grid 1000 earlier.

  Subsequently, the grid control apparatus 100 transmits a parallel command for paralleling to the power grid 1000 to the PCS 210 of the solar power generation facilities 200 of each parallel target according to the return order of the suppression / return management table 620 (S1100). At this time, when there are a plurality of solar power generation facilities 200 to be paralleled, the grid control device 100 sequentially transmits parallel commands to the respective solar power generation facilities 200 to be parallelized.

  Then, when none of the photovoltaic power generation facilities 200 installed in the power system 1000 is in the disconnection state (all in the interconnection state), the grid control device 100 proceeds to Y in S1110 and sets the suppression control flag Update to 0 and proceed to S1080. On the other hand, when there is still the photovoltaic power generation facility 200 being disconnected from the power system 1000, the process proceeds to S1080 with the suppression control flag being set to 1.

  According to such an aspect, since the plurality of solar power generation facilities 200 can be controlled not to be in parallel to the power grid 1000 all at once, the influence on the power grid 1000 is suppressed, and the quality degradation of power can be prevented. . In addition, when each solar power generation facility 200 is sequentially paralleled to the power grid 1000, the solar power generation facility 200 fluctuates each time it is paralleled to the power grid 1000 by leaving intervals for a predetermined time or more. After waiting for the state of the power system 1000 to stabilize, it can be determined whether or not the next solar power generation facility 200 should be paralleled, so the influence on the power system 1000 can be further suppressed, and the quality of the power can be further reduced. It becomes possible to prevent the decrease.

  In the above embodiment, when the grid control device 100 creates the suppression / restoration management table 620 (S1060), one or more solar power generation equipment whose difference from the suppression amount of the power generation amount is equal to or less than a predetermined value Although the combination of 200 is selected from the photovoltaic system 200 which can be disconnected from the power system 1000, as described below, the photovoltaic system 200 is sequentially selected one by one. You may do so.

  In this case, in the flowchart of FIG. 6, the jump destination of the process in the case where the suppression control flag in S1040 is 1 is changed to a point before S1060.

  For example, the grid control apparatus 100 transmits a disconnection instruction to one photovoltaic power generation facility 200 already selected as a disconnection target and disconnects the photovoltaic power generation facility 200 from the power system 1000 ( S1070), stands by for a predetermined time (S1080), and executes S1010 again. Then, the grid control device 100 compares the newly acquired measured value (the frequency of the generator 510) with the target value (the range from the first determination value to the second determination value), and a new measured value is obtained from the first determination value. If it is still large, it is determined that the power supply to the power system 1000 is to be suppressed (S1030).

  Then, since the suppression control flag is 1 (S1040), the grid control device 100 proceeds to S1060, and selects one solar power generation facility 200 to be the next disconnection target (S1060). At this time, the grid control device 100 determines the amount of power supply to be reduced by the photovoltaic power generation facility 200 (the amount of suppression of the amount of power generation by the distributed power source) based on the new measurement value described above. In order to reduce the amount of power supply, a photovoltaic power generation facility 200 to be disconnected next is selected from among the photovoltaic power generation facilities 200 interconnected with the power system 1000. Then, the grid control device 100 describes the photovoltaic power generation equipment 200 to be disconnected next in the column of the suppression order second place in the suppression and return management table 620.

  Then, the grid control apparatus 100 executes the processing of S1070, and according to the next suppression rank (second rank) of the suppression and return management table 620, a solution for causing the power grid 1000 to disconnect from the PCS 210 of the photovoltaic power generation facility 200. Send column command.

  Even in such a mode, the plurality of photovoltaic power generation facilities 200 can be controlled simultaneously so as not to be disconnected from power system 1000, so the influence on power system 1000 can be suppressed and the quality deterioration of power can be prevented. It becomes. In particular, by selecting one of the photovoltaic power generation facilities 200 to be disconnected next after selecting one of the photovoltaic power generation facilities 200, it is because the photovoltaic power generation facility 200 that was one before is de-paralleled. Since it is possible to select the next photovoltaic power generation facility 200 to be disconnected, taking into consideration the influence on the power system 1000 each time, it is possible to select an appropriate photovoltaic power system 200 more suitable for the latest state of the power system 1000. It becomes possible to select as a disjunction target.

  Further, as another form, for example, after selecting the photovoltaic power generation facility 200 to be disconnected on the basis of the grid information, the parallel distribution target is sequentially sorted according to the suppression order without acquiring new grid information. The disconnection instruction may be transmitted to each of the photovoltaic power generation facilities 200 sequentially.

  In this case, after selecting all the photovoltaic power generation facilities 200 targeted for disconnection in S1060, the grid control device 100 transmits a disconnection command to the photovoltaic power generation facility 200 with the highest suppression rank in S1070, but then After waiting for a predetermined time in S1080, the process directly proceeds to S1070, and a disconnection instruction is transmitted to the photovoltaic power generation facility 200 of the next suppression order.

  Even in such a mode, the plurality of photovoltaic power generation facilities 200 can be controlled simultaneously so as not to be disconnected from power system 1000, so the influence on power system 1000 can be suppressed and the quality deterioration of power can be prevented. It becomes.

  As described above, according to the grid control device 100 and the control method and control program 600 of the grid control device 100 according to the present embodiment, the plurality of photovoltaic power generation facilities 200 are not simultaneously disconnected or restored from the power grid 1000. Since control can be performed, fluctuation of power in power system 1000 can be suppressed, and degradation of power can be prevented.

  The embodiments described above are for the purpose of facilitating the understanding of the present invention, and are not for the purpose of limiting the present invention and interpreting the same. The present invention can be changed and improved without departing from the gist thereof, and the present invention also includes the equivalents thereof.

  For example, although the above embodiment has described the case where the photovoltaic power generation facility 200 is disconnected or restored from the power grid 1000, a wind power generation facility or a distributed power source including the photovoltaic power generation facility 200 and the wind power generation facility is used. The power system 1000 may be disconnected or connected back.

  Further, for example, although the case where the power grid 1000 is the power transmission grid has been described as an example in the above embodiment, it may be a power distribution grid.

100 system controller 110 CPU
120 Memory 130 Communication Device 140 Storage Device 150 Input Device 160 Output Device 170 Recording Medium Reader 200 Solar Power Generation Facility 210 PCS
220 solar panel 500 power station 510 generator 520 bus 530 protection device 600 control program 610 distributed power source information table 620 suppression recovery management table 700 transmission line 800 recording medium 1000 power system

Claims (8)

A control device for controlling a plurality of distributed power sources installed in a power system, comprising:
A power generation amount acquisition unit that acquires the power generation amount of each of the distributed power sources;
A system state acquisition unit that acquires measurement values that fluctuate according to the state of power of the power system from a measuring device installed in the power system;
A suppression amount calculating unit which calculates the suppression amount of the power generation amount by the dispersed power source according to a result of comparison between the measurement value and a target value of the measurement value;
A disconnection selection unit that selects a distributed power source to be disconnected from the power system based on the respective power generation amounts of the distributed power sources and the suppression amount;
A disconnection execution unit that transmits a disconnection command for disconnecting the distributed power source selected as a disconnection target from the power system to the distributed power source of the disconnection target;
For each of the plurality of distributed power sources, a maximum suppression time, which is the maximum value of the total time of paralleling within a predetermined period, and a total suppression time, which is the total time already disconnected during the predetermined period, are recorded. Table, and
Equipped with
When selecting the distributed power source to be parallel-connected, the parallel-off selection unit allows the parallel distribution from the power system such that the ratio between the maximum suppression time and the total suppression time becomes equal. Elected
The parallel separation executing unit is characterized in that, when there are a plurality of distributed power sources to be parallel separated, the parallel connection command is sequentially transmitted to the distributed power sources to be parallel separated. Control device. The control device according to claim 1, wherein
When the disconnection selection unit selects the distributed power source to be disconnected, the amount of power generated by one or more distributed power sources selected as a candidate from among the distributed power sources being interconnected to the power system. A control apparatus characterized by selecting the distributed power source as a parallelization target so that the difference between the sum and the suppression amount is equal to or less than a predetermined value. The control device according to claim 1, wherein
The system state acquisition unit acquires the new measurement value from the measuring device each time the disjunction execution unit sequentially transmits the disjunction instruction to one distributable power source of disjunction targets. And
The suppression amount calculating unit calculates a new suppression amount according to a result of comparison between the new measurement value and the target value,
The disconnection selection unit is a distributed power supply to be separated next from the power system based on the respective power generation amounts of the distributed power sources being interconnected to the power system and the new suppression amount. Elected
The control device according to claim 1, wherein the parallel separation execution unit transmits the parallel connection instruction to the next distributed parallel power source selected as a parallel separation target. The control device according to any one of claims 1 to 3, wherein
When there are a plurality of distributed power sources to be parallelized, the parallelization execution unit sequentially sequentially performs the above while separating a predetermined time or more with respect to each of the distributed power sources to be parallelized. A control apparatus characterized by transmitting a disconnection command. The control device according to any one of claims 1 to 4, wherein
The power distribution system further includes a disconnection availability table in which information indicating availability of the selection by the isolation selection unit is recorded for each of the plurality of distributed power sources installed in the power system.
When selecting the distributed power supply to be disconnected, the disconnection selection unit is connected to the power system, and the distributed power supply is recorded in the disconnection availability table to the effect that selection is possible. A control device characterized by selecting a distributed power source to be disconnected from the power system from among the above. The control device according to any one of claims 1 to 5, wherein
An increase amount calculation unit for obtaining an increase amount of the power generation amount by the distributed power source according to a result of comparison between the measured value and the target value;
The distributed power source to be paralleled to the power system is selected from the distributed power sources in the parallel connection based on the respective amounts of generation of the distributed power sources in the parallel connection from the power grid and the increase amount. A parallel election unit,
A parallel execution unit that transmits a parallel command for parallelizing the distributed power sources selected as parallel targets to the power system, to the distributed power sources that are parallel targets;
Equipped with
The control apparatus, wherein the parallel execution unit sequentially transmits the parallel command to each of the distributed power supplies of parallel objects when there are a plurality of distributed power supplies of parallel objects. . A control method of a control device for controlling a plurality of distributed power sources installed in a power system, comprising:
Maximum suppression time which is the maximum value of total time of paralleling within a predetermined period for each of the plurality of distributed power sources, and total suppression time which is the total time of disconnection already in the predetermined period by the control device And record,
The control device acquires the respective power generation amounts of the distributed power sources,
The control device acquires, from a measuring device installed in the power system, a measurement value that fluctuates according to the state of power of the power system,
The control device determines an amount of suppression of the amount of power generation by the distributed power source according to a result of comparison between the measured value and a target value of the measured value;
The control device selects a distributed power source to be disconnected from the power system based on the respective power generation amounts of the distributed power sources and the suppression amount,
The control device transmits a disconnection instruction for causing the distributed power source selected as a disconnection target to be disconnected from the power system to the distributed power source of the disconnection target,
When the control device selects the distributed power source to be disconnected, the distributed power source is selected to be disconnected from the power system such that the ratio between the maximum suppression time and the total suppression time is equal. And
The control device is characterized in that, when there are a plurality of distributed power sources to be disconnected, the control unit sequentially transmits the disconnection command to each of the distributed power sources to be disconnected. Control method of control device. A controller for controlling a plurality of distributed power sources installed in a power system;
A maximum suppression time, which is the maximum value of the total time of paralleling within a predetermined period, and a total suppression time, which is the total time of disconnection already in the predetermined period, are recorded for each of the plurality of distributed power sources. Steps and
A procedure for acquiring the amount of power generation of each of the distributed power sources;
A procedure for acquiring a measurement value that fluctuates according to a state of power of the power system from a measuring device installed in the power system;
A procedure for determining an amount of suppression of the amount of power generation by the dispersed power source according to a result of comparison between the measured value and a target value of the measured value;
A step of selecting a distributed power source to be disconnected from the power system based on the respective power generation amounts of the distributed power sources and the suppression amount;
Transmitting a disconnection instruction for disconnecting the distributed power source selected as a disconnection target from the electric power system to the distributed power source of the disconnection target;
To run
In the procedure of selecting the distributed power source to be disconnected, the distributed power source to be disconnected from the power system is selected such that the ratio between the maximum suppression time and the total suppression time is equal.
In the procedure of transmitting the disconnection command to the distributed power source to be disconnected, if there are a plurality of distributed power sources to be disconnected, sequentially with respect to each of the distributed power sources to be disconnected. Program for executing the procedure of transmitting the parallel break command.

Images