JP2016195509A - Loop controller and distribution circuit control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology for determining the operation mode in which control should be executed, in accordance with the situation at an installation point of a loop controller (LPC).SOLUTION: Two AC/DC converters 2A and 2B comprise BTB (Back To Back) that are installed between two distribution lines and include a function for detecting a voltage and a current at the installation point. An LPC control device 11 controls a power flow that flows between the two distribution lines and determines power that is to be inter-changed for the two distribution lines. An LPC operation mode discrimination part 12 determines operation modes of the AC/DC converters 2A and 2B based on either the voltage at the installation point of the two AC/DC converters 2A and 2B or a controlled variable for controlling the power flow that is determined by the LPC control device 11. In accordance with the operation mode that is determined by the LPC operation mode discrimination part 12, the LPC control device 11 performs control of the power flow.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a loop controller that is installed between distribution lines and performs power interchange and compensation between distribution systems, and a distribution system management system having the loop controller.

  The loop controller (LPC) is a power conversion device configured by BTB (Back To Back) installed between two distribution lines. The loop controller can interchange active power between distribution lines, inject reactive power into each distribution line, absorb reactive power from the distribution lines, and the like.

  For example, when a distributed power source such as solar power generation is introduced into a distribution system, it has been found that problems such as an increase in the voltage of the distribution line and a deviation from an appropriate voltage occur. In such a case, by arranging a loop controller between the distribution lines, it becomes possible to exchange power from the distribution line side where the surplus power is generated to the distribution line side where the load is large. It becomes possible.

  As an operation management method for a distribution system using a conventional loop controller, an operation management system that performs centralized control of the distribution system obtains information on the entire system and determines the operation of the loop controller as well. For example, Patent Document 1).

Patent No. 5006728

  By arranging the loop controller between the distribution lines, in addition to the above-described voltage control, effects such as leveling of the power flow of the distribution lines and reduction of transmission loss due to leveling of the power flow can be obtained. However, depending on the configuration of the distribution system, the transmission loss may increase by arranging the loop controller between the distribution lines.

  FIG. 7 is a diagram for explaining that the effect of improving the transmission loss of the loop controller differs depending on the configuration of the distribution system. FIG. 7A illustrates a case where power transmission loss is improved, and FIG. 7B illustrates a case where power transmission loss increases.

  In FIG. 7A, one of the distribution lines 1 (D1) is installed with photovoltaic power generation as a distributed power source. According to the simulation model, when the loss of the distribution line D1 at this time is 58 [kW] and the loss of the other distribution line 2 (D2) is 14 [kW], the transmission loss in the entire system is 58 + 14 = 72 [ kW].

  In this system, it is assumed that a loop controller LPC is arranged between the two distribution lines D1 and D2, and the power flow is leveled between the distribution lines D1 and D2. As a result of the simulation in this case, the loss of the distribution line D1 is 17 [kW], the loss of the distribution line D2 is 3 [kW], and the loss in the loop controller LPC is 28 [kW]. Therefore, the loss in the entire system is 17 + 3 + 28 = 48 [kW], and loss improvement of 72−48 = 24 [kW] is expected before and after the installation of the loop controller LPC.

  On the other hand, in the configuration shown in FIG. 7B, the power transmission loss is increased by arranging the loop controller. That is, the simulation result of the power transmission loss before installing the loop controller on the distribution line 2 (D2) side is 1.8 [kW] for the distribution line D1 and 15.0 [kW] for the distribution line D2. In this case, the power transmission loss before installation of the loop controller LPC in the entire system is 1.8 + 15.0 = 16.8 [kW]. The simulation results of the losses in the distribution lines D1 and D2 and the loop controller LPC after installation of the loop controller LPC are 0.6 [kW], 11.5 [kW], and 7.6 [kW], respectively. Is 0.6 + 11.5 + 7.6 = 19.7 [kW]. Thus, in the system of FIG. 7B, before and after the installation of the loop controller LPC, 16.8-19.7 = −2.9 [kW], that is, the transmission loss increases by 2.9 [kW]. It becomes.

  In order to solve such a problem, it is desirable to be able to determine whether or not the active power should be controlled in the loop controller according to the situation at the installation point of the loop controller.

  An object of the present invention is to provide a technique capable of determining in which operation mode the control should be performed according to the situation at the installation point of the loop controller.

  According to the loop controller according to one aspect of the present invention, two power conversion units configured by BTB (Back To Back) installed between two distribution lines and having a function of detecting voltage and current at the installation point A control unit for controlling power flow flowing between the two distribution lines, a power unit for determining power to be accommodated for each of the two distribution lines, and a voltage at an installation point of the two power conversion apparatuses, Or a determination unit that determines an operation mode of the power converter based on any of the control amounts for controlling the power flow determined by the control unit, and the control unit is determined by the determination unit The power flow is controlled according to the selected operation mode.

  According to the power distribution system management system according to one aspect of the present invention, two BTBs (Back To Back) that are installed between two distribution lines and have a function of detecting voltage and current at the installation point are provided. A power distribution system management system including a power conversion device and having a loop controller for controlling power flow, wherein the power flow flowing between the two distribution lines is controlled, and each of the two distribution lines is accommodated. An operation mode of the power converter based on either a control unit for determining the power to be performed, a voltage at an installation point of the two power converters, or a control amount for controlling the power flow determined by the controller And a control unit that controls power flow according to the operation mode determined by the determination unit.

  According to the present invention, it is possible to determine in which operation mode the control should be performed according to the situation at the installation point of the loop controller.

It is a figure which illustrates the power distribution system model which installs the loop controller which concerns on embodiment. It is a block diagram of the loop controller which concerns on embodiment. The figure which shows the relationship between the thing which took the difference further between the potential difference of the measurement voltage of both sides in the installation point of a loop controller, and each target voltage, and the improvement value of transmission loss, and the relationship between the difference and the accommodation active electric energy It is. It is the flowchart which showed the process which determines the operation mode by the loop controller which concerns on embodiment. It is a figure which shows the structural example of a LPC operation mode determination part. It is a figure for demonstrating the voltage when the sending voltage of a loop controller differs. It is a figure for demonstrating that the improvement effect of the transmission loss of a loop controller changes with the structure of a power distribution system.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram illustrating a distribution system model in which a loop controller according to the present embodiment is installed. In FIG. 1, a load (represented by a dot in FIG. 1) is connected to each of the distribution lines A and B, and the two distribution lines A and B are connected by a loop controller (LPC) 1.

  The loop controller 1 is a power conversion device configured by BTB (Back To Back) having a function of detecting voltage and current at an installation point. The loop controller 1 can calculate voltage and current on the distribution line A side and B side, and obtain control amounts of active power and reactive power by calculation. The loop controller 1 performs leveling of the power flow using these values obtained by measurement and calculation.

  FIG. 2 is a configuration diagram of the loop controller 1 according to the present embodiment. In FIG. 2, the configuration related to the present embodiment is mainly described, and the description of other configurations is omitted.

  In the loop controller 1 of FIG. 2, the main circuit is mainly composed of two AC / DC converters 2 </ b> A, 2 </ b> B, and the control circuit 10 is composed of an LPC control device 11 and an LPC operation mode determination unit 12. .

  The AC / DC converters 2A and 2B of the main circuit are configured by BTB as described in the description of FIG. One AC / DC converter 2A (or 2B) converts alternating current into direct current, and the other AC / DC converter 2B (or 2A) again converts direct current into alternating current and outputs the result. By controlling the power flow from the power distribution lines A to B or from B to A according to the voltages of the two power distribution lines A and B, the power flow is leveled, thereby improving the power transmission loss.

  The measurement units 3A and 3B provided on the main circuit side have voltmeters and ammeters for measuring the voltages VA and VB and currents IA and IB on the distribution lines. The measurement units 3 </ b> A and 3 </ b> B output measurement results to the control circuit 10.

  The LPC control device 11 of the control circuit 10 includes the voltage VA and current IA on the distribution line A side and the voltage VB and current IB on the distribution line B side and the two AC / DC conversions in the AC / DC converters 2A and 2B constituting the main circuit. A value such as a DC voltage Vdc between the devices 2A and 2B is acquired from the main circuit side. Then, the LPC control device 11 performs necessary calculations based on the acquired measurement values, and issues active power commands PA and PB and reactive power commands QA and Q to the main circuit. Since a known technique is used for the method in which the LPC controller 11 generates the command values PA, QA, PB, and QB from these measured values, detailed description thereof is omitted.

  The LPC operation mode determination unit 12 uses the measurement value acquired from the measurement units 3A and 4B and the command value generated by the LPC control device 11 to determine in which operation mode the loop controller 1 should operate, that is, which It is determined whether or not the current flow control should be performed.

  Thus, in the loop controller 1 according to the present embodiment, the LPC operation mode determination unit 12 determines the operation mode using the value measured by the loop controller 1 or the generated command value. The LPC control device 11 controls the main circuit according to the operation mode determined by the LPC operation mode determination unit 12.

  The operation modes of the loop controller 1 include a mode for controlling active power and reactive power and a mode for controlling only reactive power. According to this embodiment, regardless of whether the loop controller 1 is in operation and in which mode it is operating, it is possible to determine a mode to be appropriately operated and improve power transmission loss. Is possible. This will be described with reference to FIG.

  FIG. 3 is a diagram showing the relationship between the difference between the potential difference between the measured voltage on both sides at the installation point of the loop controller 1 and the respective target voltage and the improvement value of the transmission loss, and the relationship between the difference and the available active energy. It is.

  In the graph of FIG. 3A, the horizontal axis indicates the difference between the potential difference between the measured voltage on both sides at the installation point of the loop controller 1 and each target voltage, and the vertical axis indicates the improvement value of the transmission loss corresponding thereto. . When the vertical axis takes a positive value, the transmission loss is “improved”, and when it takes a negative value, the transmission loss is “increased”.

  As shown in the graph of FIG. 3A, when the difference between the potential differences between the measured voltages on both sides at the installation point of the loop controller 1 and the respective target voltages is equal to or greater than a predetermined value, the improvement value of the power transmission loss is a positive value. You can see that Therefore, when the improvement value of the power transmission loss takes a positive value, that is, when the power loss can be reduced by operating the loop controller 1, the loop controller 1 is caused to perform a normal operation. Normal operation refers to controlling active power and reactive power.

  On the other hand, when the improvement value of the power transmission loss takes a negative value, that is, when the power transmission loss increases by operating the loop controller 1, the loop power control is not performed in the loop controller 1, and the reactive power is reduced. The configuration is such that only control is performed. In this way, the difference between the potential differences serving as threshold values when determining how to operate the loop controller 1 is set to X [V].

  In the graph of FIG. 3B, as in FIG. 3A, the horizontal axis represents the potential difference between the distribution lines at the installation point of the loop controller 1. The vertical axis represents the amount of active power that the loop controller 1 can accommodate.

  As shown in FIG. 3B, the interchangeable active energy of the loop controller 1 is proportional to the difference between the potential differences between the measured voltages on both sides at the installation point and the respective target voltages. From this, even if the loop controller 1 is in operation and controlling active power and reactive power, whether the loop controller 1 is operated based on the available active power amount (control amount by the loop controller 1). It can be determined whether or not. In other words, the loop controller 1 uses the interchangeable active energy Y [kW] when the difference between the potential difference between the measured voltage on both sides of the installation point of the loop controller 1 and each target voltage is X [V] as a threshold value. It is determined whether or not the loop controller 1 is to be operated based on whether or not the interchangeable active power amount is Y [kW] or more.

  Next, how to determine the operation mode using these threshold values (difference X [V] between potential differences and interchangeable active energy Y [kW]) and the measured value in the loop controller 1 will be described. This will be described with reference to the flowchart of FIG.

  FIG. 4 is a flowchart showing processing for determining the operation mode of the own apparatus by the loop controller 1 according to the present embodiment. The LPC operation mode determination unit 12 of the loop controller 1 executes a series of processes shown in FIG. 4 at regular intervals or at startup, for example.

  In the operation mode determination process, first, in step S1, the LPC operation mode determination unit 12 determines the current operation mode. If it is “normal control mode” for controlling active power and reactive power, the process proceeds to step S5. If it is “reactive power control mode” for controlling only reactive power, the process proceeds to step S8. Shift processing. If the loop controller 1 has not started operation, the process proceeds to step S2.

  In step S2, the LPC operation mode determination unit 12 determines whether or not the difference between the potential differences between the measured voltages on the two distribution lines A and B and the respective target voltages is equal to or greater than a predetermined threshold value. Specifically, the potential difference between the measured voltage values of the two distribution lines A and B at the installation point of the loop controller 1 and the target value of the voltage on each distribution line side is taken. And a difference is further taken with the potential difference by the side of the distribution line A, and the potential difference by the side of the distribution line B, and it is determined whether the difference is more than X [V].

  If the difference obtained in step S2 is equal to or greater than X [V], the process proceeds to step S3, and the LPC operation mode determination unit 12 informs the LPC controller 11 that the operation mode of the loop controller 1 should be set to the normal control mode. Notify and finish the process. If the difference is less than X [V], the process proceeds to step S4, and the LPC operation mode determination unit 12 notifies the LPC control device 11 that the operation mode of the loop controller 1 should be set to the reactive power control mode, and the process Exit.

  In the processing after step S2, as described above with reference to FIG. 3A, if the difference obtained by the distribution lines A and B is not less than X [V], the improvement value of the transmission loss is positive. The operation mode is determined by using this. Thus, the non-operating loop controller 1 starts operation in an appropriate operation mode.

  If it is determined in step S1 that the operation mode is the normal control mode, the process proceeds to step S5. In step S5, the LPC operation mode determination unit 12 determines whether or not the interchangeable active power amount is equal to or greater than a predetermined threshold value. Specifically, it is determined whether the interchangeable active energy calculated from the information input from the main circuit of the loop controller 1 is equal to or greater than Y [kW].

  In step S5, if the available active power amount is Y [kW] or more, the process proceeds to step S6, and the LPC operation mode determination unit 12 notifies the LPC control device 11 that the operation mode should be set to the normal control mode. The process is terminated. If the interchangeable active power amount is less than Y [kW], the process proceeds to step S7, and the LPC operation mode determination unit 12 notifies the LPC control device 11 that the operation mode should be set to the reactive power control mode, and the process is performed. finish.

  While the loop controller 1 is operating in the normal control mode, the voltage values on the distribution lines A and B at the installation point of the loop controller 1 cannot be directly measured. However, as described with reference to FIGS. 3A and 3B, the interchangeable active energy is proportional to the difference between the potential differences at the installation point, so that the interchangeable effective energy exceeds Y [kW]. In the case of taking, it can be seen that the improvement value of the transmission loss is a positive value. From this, when the loop controller 1 is operating in the normal control mode, the operation mode is determined based on the determination as to whether or not the interchangeable active power amount is Y [kW] or more.

In step S1, if the operation mode is the invalid control mode, in step S8, the LPC operation mode determination unit 12 calculates the reactive power control amounts QA and QB of the LPC control device 11 from the self-end voltages VA and VB. Calculate the voltage of each distribution line when invalid control is not performed. For example, the system voltage is −0.05 [p. u. The voltage value when the invalid control is not performed in the case where the control that outputs +300 [kVar] is performed is obtained by the following calculation formula.
(Voltage value before control [V]) = (Current voltage value [V]) − Reactive power command value Q / 300 [kVar] × 0.05 [p. u. ] X 6600 [V]
In addition, about the method of calculating the voltage of the distribution line when not performing reactive control from this self-end voltage and reactive power control amount, a well-known method is used.

  In step S9, the LPC operation mode determination unit 12 determines whether or not the difference between the potential differences between the measured voltages of the two distribution lines A and B and the respective target voltages is equal to or greater than a predetermined threshold value. . Specifically, the difference between the voltage value when the invalid control of the distribution lines A and B obtained in step S8 is not performed and the target value of the corresponding voltage is obtained. And a difference is further taken with the potential difference by the side of the distribution line A, and the potential difference by the side of the distribution line B, and it is determined whether the difference is more than X [V].

  If the difference obtained in step S9 is greater than or equal to X [V], the process proceeds to step S10, and if the difference is less than X [V], the process proceeds to step S11. The processing of the LPC operation mode determination unit 12 in step S10 and step S11 is the same as that in step S6 and step S7, respectively.

  As described above, whether the LPC operation mode determination unit 12 is controlled in the normal control mode (controlling the active power and the reactive power) by the method according to the operation state of the loop controller 1 leads to the improvement of the transmission loss. Determine whether or not. Even when the loop controller 1 is in operation, the operation mode can be appropriately determined by using the interchangeable active power amount or the self-end voltages VA and VB and the reactive power control amounts QA and QB.

  FIG. 5 is a diagram illustrating a configuration example of the LPC operation mode determination unit 12. With reference to FIG. 5, a specific circuit configuration for the LPC operation mode determination unit 12 to determine an operation mode using a control amount or a measurement value by the own apparatus according to the operation state of the loop controller 1 will be described. .

  When the loop controller 1 is not operating, the determination is made in the upper block in the circuit shown in FIG. Specifically, in the comparator 21, the difference ΔV between the potential difference between the voltage VA on the distribution line A side, the voltage VB on the distribution line B side, and the respective target voltages, and the threshold value X [V] Compare If ΔV ≧ X, a value “1” indicating that active power and reactive power should be controlled in the normal control mode is set. If ΔV <X, a value “0” indicating that only reactive power control should be performed in the reactive power control mode is set.

  When the loop controller 1 is in the normal control mode (controlling active power and reactive power), the determination is performed in the middle block of the circuit shown in FIG. Specifically, the comparator 22 controls the active power amount (referred to as (a) in FIG. 5) that the main circuit of the loop controller 1 has accommodated by the control of the LPC control device 11 and the threshold value. A certain Y [kW] is compared. If interchangeable active energy (a) ≧ Y, a value “1” indicating that control should be performed in the normal control mode is set. If (a) <Y, control should be performed in the reactive power control mode. A value “0” representing the effect is set.

  When the loop controller 1 is in the reactive power control mode (only reactive power control is performed), the determination is performed in the lower block of the circuit shown in FIG. Specifically, first, a value obtained by applying a gain to the reactive power detection value QA of the distribution line A (FIG. 5B) to obtain a change in voltage by reactive power control, and a voltage detection value of the distribution line A A voltage when the invalid control is not performed is obtained from VA ((d) in FIG. 5) by a known method. A potential difference between the voltage value on the distribution line A side when the control thus obtained is not performed and the voltage target value on the distribution line A side ((c) in FIG. 5) is further obtained. Similarly, on the distribution line B side, a change in voltage due to the reactive power control is obtained from the reactive power detection value QB ((e) of FIG. 5), and this and the voltage detection value VB of the distribution line B ((g) of FIG. 5). ) To obtain the voltage when invalid control is not performed. A potential difference between the voltage value on the distribution line B side when the reactive power control thus obtained is not performed and the voltage target value on the distribution line B side ((f) in FIG. 5) is further obtained.

  Further, a difference k is further calculated between the potential difference between the distribution line A side and the target value and the potential difference between the distribution line B side and the target value. At 23, the value k is compared with the threshold value X [V]. If k ≧ X, a value “1” indicating that control should be performed in the normal control mode is set, and if k <X, a value “0” indicating that control should be performed in the reactive power control mode is set. Set.

  Thus, the value “1” or “1” indicating whether the loop controller 1 should operate in the normal control mode, the reactive power control mode, or the non-operating mode, respectively. “0” is set. When the value input from any of the above three blocks is “1”, the OR circuit 24 notifies the LPC control device 11 to enter the normal control mode, and the value is “0”. Notifies the LPC controller 11 to enter the reactive power control mode.

FIG. 6 is a diagram for explaining a voltage when the sending voltage of the loop controller 1 is different.
As previously described with reference to FIGS. 4 and 5, when the loop controller 1 is not operating, the operation mode is determined based on the difference ΔV in the potential difference between the voltages VA and VB at both ends and the respective target voltages. ing. This is because the feed voltages of the two distribution lines A and B in which the loop controller 1 is installed are different. If the distribution line in which the loop controller 1 is installed is in the same bank and the delivery voltage is the same, it is not necessary to take the difference from the target voltage, and the operation mode is determined based on the difference in voltage between the distribution lines A and B. Can do.

  As described above, according to the loop controller 1 according to the present embodiment, whether the loop controller 1 is controlling active power and reactive power, controlling reactive power, or not operating. Even in this case, it is determined whether or not the transmission loss is improved by controlling the active power by a method according to each case.

  Specifically, when the difference between the potential differences between the distribution lines A and B measured voltages and the respective target voltages can be obtained, it is based on whether or not the difference is equal to or greater than the threshold value X [V]. judge. Whether the loop controller 1 is operating in the reactive power control mode or not operating can be determined using this threshold value X [V]. On the other hand, if the difference obtained from the distribution lines A and B cannot be obtained directly because the loop controller 1 is operating in the normal control mode, is the interchangeable active energy amount equal to or greater than the threshold value Y [kW]? Determine based on whether or not. Thus, it is possible to determine how the operation mode should be set based on the situation at the installation point of the loop controller 1, that is, the voltage at the installation point, the control amount by the loop controller 1, and the like.

  In the above description, a case is described in which the loop controller 1 includes the LPC operation mode determination unit 12 and the operation mode is determined by acquiring measurement results from the measurement units 3A and 3B on the control circuit 10 side of the loop controller 1. However, it is not limited to this. For example, it is good also as a structure provided with the high-order apparatus etc. which centrally monitor a power distribution system, and acquiring the measurement result of measurement unit 3A, 3B of the loop controller 1 in a high-order apparatus etc., and determining an operation mode. The host device may notify the control mode 10 (the LPC control device 11) of the loop controller 1 of the determination result of the operation mode, and the loop controller 1 may perform control according to the notification result. As described above, the same effect as described above can be obtained even when the above method is implemented in the entire system.

  The present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, all the constituent elements shown in the embodiments may be appropriately combined. Furthermore, constituent elements over different embodiments may be appropriately combined. It goes without saying that various modifications and applications are possible without departing from the spirit of the invention.

DESCRIPTION OF SYMBOLS 1 Loop controller 2A, 2B AC / DC converter 3A, 3B Measurement unit 10 Control circuit 11 LPC controller 12 LPC operation mode determination part

Claims (5)

Two power converters configured with BTB (Back To Back) installed between two distribution lines and having a function of detecting voltage and current at the installation point;
A control unit that controls the power flow flowing between the two distribution lines and determines the power to be accommodated for each of the two distribution lines;
A determination unit that determines an operation mode of the power conversion device based on either a voltage at an installation point of the two power conversion devices or a control amount for controlling a power flow determined by the control unit;
Have
The said control part controls electric power flow according to the operation mode which the said determination part determined. The loop controller characterized by the above-mentioned. The determination unit
If the operation mode of the power converter is a normal control mode for controlling active power and reactive power, whether or not the amount of power accommodated by the power converter is equal to or greater than a first threshold value. Judgment,
When the amount of power accommodated by the power converter is equal to or greater than the first threshold, the operation mode of the power converter is determined as the normal control mode, and the amount of power accommodated 2. The loop controller according to claim 1, wherein the operation mode of the power converter is determined to be a reactive power control mode in which only reactive power control is performed when the power threshold value is less than the first threshold value. . The determination unit
When the operation mode of the power converter is a reactive power control mode in which only reactive power is controlled, each voltage when the reactive power is not controlled is determined from the voltage at the installation point of the two power converters. Calculate
The difference between the voltage when the calculated reactive power is not controlled and the target voltage is obtained for each of the two power converters, and whether or not the difference between the obtained differences is equal to or greater than a second threshold value. Judgment,
When the difference between the differences is equal to or greater than the second threshold, the operation mode of the power converter is determined as a normal control mode for controlling active power and reactive power, and the difference between the differences 3 is determined to be the reactive power control mode, the loop controller according to claim 1 or 2, wherein the operation mode of the power converter is determined as the reactive power control mode. The determination unit
When the two power converters are not operating, the difference between the voltage at the installation point and the target voltage is obtained for each of the two power converters, and the difference between the obtained differences is equal to or greater than the second threshold value. Whether or not
When the difference between the differences is equal to or greater than the second threshold, the operation mode of the power converter is determined as a normal control mode for controlling active power and reactive power, and the difference between the differences 5 is less than the second threshold value, the operation mode of the power conversion device is determined to be a reactive power control mode in which only reactive power control is performed. . A loop controller that is installed between two distribution lines and includes two power converters composed of BTB (Back To Back) having a function of detecting voltage and current at the installation point, and controls power flow A distribution system management system comprising:
A control unit that controls the power flow flowing between the two distribution lines and determines the power to be accommodated for each of the two distribution lines;
A determination unit that determines an operation mode of the power conversion device based on either a voltage at an installation point of the two power conversion devices or a control amount for controlling a power flow determined by the control unit;
Have
The power distribution system management system, wherein the control unit controls a power flow according to an operation mode determined by the determination unit.