KR101926307B1 - Control method of distribution Automation System - Google Patents

Abstract

The present invention provides an electric power distribution automation system which can efficiently perform electric power distribution management by dramatically reducing data which is concentrated on the center. According to the present invention, a method of controlling electric power distribution automation system comprises: a first step of setting an initial electric power distribution network by an electric power distribution automation control server; a second step of measuring a load current by electric power distribution automation terminal devices; a third step of transmitting and receiving control base data to other electric power distribution automation terminal devices adjacent to the electric power distribution automation terminal devices; and a fourth step of determining whether an opening is normally managed or whether an opening state is changed by the electric power distribution automation terminal device corresponding to a normally open opening and closing unit.

Description

Technical Field [0001] The present invention relates to a control method of distribution automation system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a distribution automation system, and more particularly, to a method for controlling a management system for automating the opening and closing of a distribution line.

Algorithm calculation of the power distribution system takes a lot of time, which not only involves a time problem throughout the operation of the automation system, but also causes errors due to use of performance data or estimated data instead of real time data. When the distribution automation system is constructed, accurate real-time algae data can be collected by remote measurement, but the concentration of data is concentrated on a centralized basis. Since the amount of computation due to such real-time data is very large, systematic dependence on the distribution automation system There is a problem that it is large.

In particular, SCADA system is also called centralized remote monitoring control system or monitoring control data collection system and performs monitoring and control function of the power grid. The SCADA system collects, receives, records, and displays the status information data of the remote device to a remote terminal unit using analog or digital signals on the communication path, and the central control system monitors and controls the remote device. · This is a system that centrally monitors and controls various kinds of remote facilities such as transmission and distribution facilities, petrochemical plants, steel process facilities, and factory automation facilities.

In the distribution automation process using the SCADA system, the decision and the decision of the manager must be posted.

Korean Patent No. 10-0637417 ("Method for Constructing Optimal Distribution System for Leveling Distribution of Power Distribution System ", hereinafter referred to as Prior Art 1) relates to a distribution automation method for optimizing algae calculation, 10-0901319 ("Distribution Intelligent System and Method", hereinafter referred to as "Prior Art 2") relates to an integrated operation system of power distribution system, but in this case as well, There arises a problem that a problem occurs, and data is excessively concentrated in the central management server.

On the other hand, the Smart Grid is a cross-national project that many advanced countries are promoting ahead of the world. The Smart Grid has been presented as a solution to global warming due to depletion of fossil fuels and carbon emissions in the world. However, problems have arisen in the voltage control, voltage unbalance, harmonics, frequency fluctuation, short-circuit current of the system, stand-alone operation, and stability occurring in the distributed power supply system of the smart grid.

Until now, several methods have been developed for single operation detection. These detection methods are classified into two approaches as follows. The first method is the most common over / under voltage and frequency detection technique in a passive manner. This is how the inverter stops when the voltage / frequency of the system exceeds the set value. The second method, the voltage harmonic monitoring technique, utilizes the principle that the voltage harmonic component increases due to the exciting current supplied to the distribution transformer when the system is in a stand-alone state. This active method has an output power fluctuation system that detects anomalies with an active power unbalance, an active frequency fluctuation system that observes the frequency of a terminal voltage, and a sliding mode frequency fluctuation system that observes a frequency change occurring in a single operation state.

However, these single operation detection methods have problems in detecting the single operation state. And / low voltage and frequency detection techniques fail to detect stand-alone operation when the inverter generation output matches the load associated with the same system. The voltage harmonic monitoring technique is almost impossible to set an appropriate harmonic value for blocking the inverter when there is a nonlinear load. The output power fluctuation method has no effect due to the leveling effect unless a plurality of distributed power sources connected to the same system are synchronized. The active frequency variation method is liable to fail when the load phase angle coincides with the phase value generated by the frequency variation. Finally, the sliding mode frequency variation technique fails to detect single operation if the load phase is equal to the initial phase of the inverter.

In addition, if the power is uniformly managed in the center, since the central power management system can not know the information about each distributed power, there is a problem that it becomes an inefficient power management structure that consumes even when surplus power is generated.

The present invention provides a distribution automation system capable of effectively performing power distribution management by minimizing power loss on a line and leveling the amount of power supply, and dramatically reducing centralized data.

In addition, the present invention provides a means for quickly and efficiently assisting in the management of the dispersed electric power supply and the countermeasures in the event of an accident.

A plurality of distribution lines constituting a distribution route to which electric power is supplied from a plurality of distribution class substations; a normally open switching section provided in a normally open state on the distribution lines; A method for controlling a distribution automation system including an opening / closing part including an always-open closing / opening part, a distribution automation terminal device controlling the opening / closing part, and a distribution automation management server connected to the distribution automation terminal device, A first step of the distribution automation management server setting the initial distribution by dividing the opening / closing unit into the normally-open / close unit and the normally open / closed unit; A second step in which the distribution automation terminal devices measure a load current; A third step of transmitting and receiving control basic data including the measured load current and the provisional power loss calculated from the measured load current to the other distribution automation terminal apparatus adjacent to the distribution automation terminal apparatuses; And the power distribution automation terminal device corresponding to the normally open opening and closing part of the opening and closing part compares the calculated provisional power loss and the provisional power loss delivered from the other opening and closing parts to determine whether to keep the opening at all times or to set the target opening / And a fourth step of determining whether the state is transferred,

The fourth step may further include a step of, when the power distribution automation terminal device determines that the difference between the provisional power loss delivered from the other open / close portions and the calculated provisional power loss is equal to or greater than a predetermined reference value, A predicted power loss in the case where the normally open state is transferred to the open / close unit that has transmitted the large provisional power loss value is calculated, and the calculated predicted power loss is compared with the calculated provisional power loss to determine whether to transfer the normally open state.

When the transfer of the normally open state occurs, the distribution automation management server receives status data of the switches from the distribution automation terminal devices corresponding to the normally open switching section and the normally open switching section adjacent to the normally open switching section, And converting it into a DB.

In addition, when the distribution automation management server has transferred the normally open state, it may further comprise DB for a predetermined time before and after the previous time point of the normally open state.

Also, in parallel with the second to fourth steps, the distribution automation management server calculates power supply amount and power loss for each section of the distribution line using the control basis data transmitted from the switches, And re-adjusting the position of the opening and closing part.

After the fourth step, the second to fourth steps may be repeated. In this case, before repeating the second step to the fourth step after the fourth step, the distribution automation management server uses the control basis data transmitted from the switches to calculate the power supply amount and power And determining whether to re-adjust the position of the normally open switching unit by calculating a loss.

The present invention minimizes power loss by applying power loss minimization method and improves load ratio of power distribution line by applying power supply leveling method. Thus, economic loss is reduced and efficient operation of power distribution Can be achieved.

1 is a conceptual diagram schematically showing a distribution management system according to an embodiment of the present invention.
FIG. 2 is a view showing a distribution route according to an embodiment. FIG.
3 is a flowchart showing a distribution management method according to an embodiment.
4 is a flowchart illustrating a method of rebalancing a distribution according to an embodiment.
5 is a conceptual diagram schematically showing a distribution management system capable of managing distributed power according to another embodiment.
6 is a flowchart showing a distribution management method according to another embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the absence of special definitions or references, the terms used in this description are based on the conditions indicated in the drawings. The same reference numerals denote the same members throughout the embodiments. For the sake of convenience, the thicknesses and dimensions of the structures shown in the drawings may be exaggerated, and they do not mean that the dimensions and the proportions of the structures should be actually set.

A distribution management system according to an embodiment of the present invention will be described with reference to FIG. 1 is a conceptual diagram schematically showing a distribution management system according to an embodiment of the present invention.

1, a distribution automation system 10 according to an embodiment of the present invention includes a plurality of distribution lines 101 and 102, a plurality of switching units 120, a distribution automation server 140, a communication unit 180, And a distribution automation terminal device 190. Each of the distribution lines 101 and 102 connects the substations 51 and 52 with the electricity receiving place to form a distribution network.

Each of the opening and closing portions 120 is installed in the power distribution lines 102 and maintains a state of being open or closed by the power distribution lines 101 and 102. The opening / closing parts 120 are monitored and controlled remotely from the server 140. The switching units 120 are divided into a plurality of normally open switching units 133 that are normally open and a plurality of always-on switching units 131 that are normally turned on. The switching units 120 are switched to each other to form a power distribution line.

The switching units 71 and 72 connected to the switching units 120 installed on the distribution line 102 or the substations 51 and 52 and the switching units 71 and 72 connected to the switching units 71 and 72, (120) are defined as one section. Loads are connected to each section.

The distribution automation server 140 instructs each of the opening and closing portions 120 to measure the load current and receives and stores the measurement data of the load current from each of the opening and closing portions 120. However, in the present embodiment, such data collection need not be performed in real time, and data may be collected every predetermined period or at a predetermined time or in a re-adjustment process to be described later.

In other words, in the present embodiment, the distribution automation server 140 mainly manages the distribution plan through the control of each distribution automation terminal device, rather than collecting data and managing the distribution plan through the centralized manner .

The server 140 stores the list of the normally open opening / closing part 133 and the measurement data at the time of re-adjustment of the distribution view or at the initial setting or initialization of the distribution view and uses the list and the measurement data to open the normally open / 133) for calculating a power supply amount and a power loss of each of the power distribution lines (101, 102) according to the positional shift of each of the power distribution lines (133, 133) Confirm the location. To this end, the server 140 includes a control module 150, a database 160, and an application module 170. The control module 150 remotely monitors and controls each of the opening and closing portions 120 and receives the measurement data and transmits the measurement data to the database 160. [ The database 160 can display and search the connectivity of the distribution lines 101 and 102. Specifically, the database 160 controls the opening / closing portions 120 and the lines 120 between the ends of the power distribution lines 101 and 102 from the blocking portions 71 and 72 drawn out from the respective substations 51 and 52, Lt; / RTI > In addition, the database 160 stores thicknesses and lengths of wires of each section and impedance per unit length for each wire type for technical calculation such as power loss and voltage drop.

The database 160 receives and stores the measurement data from the control module 150, and stores the list of the normally open switching units 133 installed in the distribution view.

The application module 170 may be configured to receive the distribution lines 101 and 102 from the database 160 using the list and the measurement data at the time of the initial distribution setting or total re- ) Is calculated for each section. The application module 170 determines the position of the normally open switching unit 133 by using the calculation result of the power supply amount and the power loss. For example, the application module 170 may minimize the power supply leveling ratio of the power distribution lines 101 and 102 when the normally open switching unit 133 is moved to a position where the normally open switching unit 133 is movable within the power distribution, The positions of the normally open switching units 133 are determined at a position where the sum of power losses of the power distribution lines 101 and 102 is minimum. Here, the positional shift of the normally open switching unit 133 is performed by setting two distribution lines 101, 102 whose distribution routes are distinguished by the normally open switching unit 133 among the distribution lines 101, 102 as a simulated distribution route, (131) in the simulated distribution route and then switching one of the normally-open switching portions (131) provided in the simulated distribution path to the normally open switching portion (133) .

It is most preferable that the application module 170 determines the position of the normally open switching unit 133 in the distribution view considering both the power supply amount normalization ratio and the sum of the power loss, It is also possible to determine the position of the normally open switching unit 133 considering only one of the power supply amount equalization and the sum of the power loss.

The communication unit 180 receives data related to the overall state of the distribution including the measured data such as control basis data from the distribution automation terminal devices 190 and performs communication to transmit and receive control signals and the like.

Each of the distribution automation terminal devices 190 is connected to the opening and closing portions 120 and determines whether the opening and closing portions 120 are normally opened or closed by mainly using the data measured in the surroundings, And controls the opening / closing portions 120 through a measurement command and a remote control command from the distribution automation management server 140 only at the time of readjustment. Each of the distribution automation terminal devices 190 transmits the control result of the opening / closing portions 120 to the communication portion 180.

Specifically, the distribution automation terminal device 190 transmits / receives control basic data including [the measured load current, the provisional power loss calculated from the measured load current, and whether or not the normally open state is acquired] In the case of the normally open switching unit 133 among the switching units 120, the provisional power loss delivered from the other switching units is compared with the calculated provisional power loss to maintain the normally open state or the target opening / closing unit of the switching units, can do. At this time, when the difference between the provisional power loss delivered from other open / close portions and the provisional power loss calculated by itself is equal to or greater than a predetermined reference value, the distribution automation terminal device 190 determines, from the measured load current delivered from the other open / close portions, The predicted power loss in the case where the normally open state is transferred to the opening / closing section that transmitted the power loss value is calculated. The predicted power loss calculated after this is compared with the provisional power loss calculated by itself, so that it is possible to determine whether or not the normally open state is transferred according to the result of minimizing the power loss. At this time, the transfer of the normally open state means that a signal is transmitted to switch the target opening / closing portion to the normally open state, and the self which is in the normally open state is switched to the normally charged state. The power loss can be calculated by calculating the total resistance in the corresponding section from the resistance of the section length and the resistance per unit length, and reflecting the measured current to be measured.

Also, the distribution automation management server 140 receives state data of the switches from the distribution automation terminal devices corresponding to the always-open switching section and the normally-open switching section adjacent to the normally-open switching section, It is also possible to convert the data for a certain period of time before and after the base time to a DB based on the previous time point of the normally open state.

A method of controlling a distribution automation system according to an embodiment will be described with reference to FIGS. 2 to 4. FIG. 3 is a flow chart illustrating a distribution management method according to an embodiment, and Figs. 4 (a) and 4 (b) are diagrams illustrating a distribution management method according to an embodiment, Fig.

F2, F3, F4, F5, and F6 and the first to sixth distribution lines F1, F2, F3, and F4, as shown in FIG. 2, , F5, and F6, respectively. The opening and closing portions 120 are divided into a plurality of normally open opening and closing portions 133 and a plurality of normally opening and closing portions 131 according to the operation state. The opening / closing portions 120 are monitored remotely by the server 140, and the opening / closing of the opening / closing portions 120 is controlled only when necessary. In other words, the opening / closing portions 120 are basically determined by the distribution automation terminal device provided in each of the opening / closing portions 120 whether or not they are opened or closed without intervention of the server depending on the surrounding circumstances. .

In the case where control is directly performed by the central server or the distribution automation management server or the like, it is limited to the case of initializing the distribution scheme (S100) or re-arranging the distribution scheme (S500) as shown in FIG.

Specifically, a plurality of distribution lines constituting a distribution route to which electric power is supplied from a plurality of distribution class substations, a normally open switching section provided in a normally open state on the distribution lines, And a distribution automation management server connected to the distribution automation terminal device, the method comprising the steps of: determining whether the distribution automation terminal device The method for controlling the distribution automation system includes the following steps.

As a first step, the distribution automation management server divides the opening / closing unit into the normally-open / close unit and the normally open / open unit to set an initial distribution (S100).

As a second step, the distribution automation terminal devices measure a load current (S200).

As a third step, the distribution automation terminal devices transmit and receive control basic data including the measured load current and the provisional power loss calculated from the measured load current to and from the adjacent other distribution automation terminal device (S200).

In the fourth step, the distribution automation terminal corresponding to the always open / close part of the opening / closing part compares the calculated temporary power loss and the provisional power loss delivered from the other open / close parts so as to maintain the open / And determines whether to transfer the normally open state. At this time, when the power distribution automation terminal device has a difference between the provisional power loss delivered from the other open / close portions and the calculated provisional power loss equal to or greater than a predetermined reference value, the largest provisional power loss from the measured load current delivered from the other open / The predicted power loss in the case where the normally open state is transferred to the opening / closing section that transmitted the value is calculated. Thereafter, the calculated predicted power loss is compared with the calculated provisional power loss to determine whether to transfer the normally open state.

When the transfer of the normally open state occurs, the distribution automation management server receives status data of the switches from the distribution automation terminal devices corresponding to the normally open switching section and the normally open switching section adjacent to the normally open switching section, And converting the data into a DB when the distribution automation management server transfers the normally open state to the DB when the distribution automation management server has transferred the normally open state, As shown in FIG.

On the other hand, by repeating the second to fourth steps, the position of the normally open switching unit 131 gradually moves in a direction to minimize power loss. However, in this case, it is difficult to make a large change in the distribution schedule at a time as compared with the centralized control method, but it is possible to reduce the power loss by measuring and determining the circumstance of each of the opening and closing portions. Particularly, this process is effective in maintaining stable distribution when a large number of distributed power sources are input.

In addition, the distribution automation management server may use the control basis data transmitted from the switches before performing the second to fourth steps in parallel with the second to fourth steps, or after the fourth step Calculating a power supply amount and a power loss of each of the power distribution lines and determining whether to re-adjust the position of the normally open switching unit.

As described above, in the case of the process according to the present embodiment, the position of the normally open opening / closing part is gradually moved to minimize the power loss. In this case, centralized data collection is minimized, which can facilitate power management in large cities. However, in this case, depending on the power supply situation or the operation state of the distributed power supply, the position of the normally open opening / closing part may be shifted somewhat to one point, or in the event of an accident, shall. This process is referred to as a rebalancing process, which can introduce a variety of conventional centralized distribution automation processes.

Specifically, in the rebalancing process, the distribution automation management server 140 calculates the power loss of each of the third and sixth power distribution lines F3 and F6 while moving the position of the normally open switching unit 133, Store the sum. The distribution automation management server 140 moves the normally open opening and closing part 133 of the N31 to the normally closing opening and closing part 131 of the N41 within the simulated distribution route. For example, the distribution automation management server 140 switches the operation state of the normally open opening / closing part 133 of the N31 to the normal closing, and switches the operation state of the normally closing opening / closing part 131 of the N41 to the normally open state. The distribution automation management server 140 calculates the power loss of each of the third and sixth power distribution lines F3 and F6 after moving the normally open switching unit 133 and stores the sum of the power losses. The distribution automation management server 140 repeats this series of processes until the power loss is no longer reduced in the simulated distribution path so that the normally open switching unit 133 can not be moved. The distribution automation management server 140 uses the sum of the stored power losses to select the location of the normally open switching unit 133 having the smallest sum of the power losses.

The distribution automation management server 140 selects a remaining normally open switching unit 133 within the distribution route and defines a simulated distribution route composed of two distribution lines 101 and 102 connected to the normally open switching unit 133. [ The distribution automation management server 140 repeats a process of moving the normally open switching unit 133 and selects the position of the normally open switching unit 131 to a position where the sum of the power losses is minimum. The distribution automation management server 140 determines the position of the normally open switching unit 133 by minimizing power loss of the power distribution lines 101 and 102.

Also, the distribution automation management server 140 may repeat the series of processes of moving the position of the normally open switching unit 133 after defining the simulated distribution route to level the power supply of the distribution platform. The power supply leveling method calculates a leveling ratio of the power supply amount of the power distribution lines 102 according to the positional shift of the normally open switching unit 133 as in the power loss minimization method, The position of the normally open switching unit 133 is selected.

The distribution automation management server 140 may have different calculation results of the power loss minimization method and the power supply amount equalization method. Accordingly, the distribution automation management server 140 can determine the location of the normally open switching unit 133 considering both the power loss minimization method and the power supply amount equalization method.

4, in step S10, the distribution automation management server 140 stores all the normally open / closed portions 133 installed in the distribution network as a list, and moves the positions of the normally open / closed portions 131 The control procedure of the opening / closing portions 120 is made.

In step S20, the distribution automation management server 140 obtains an objective function in the current state.

In step S30, the distribution automation management server 140 determines a combination of the normally open switching units 133 and sets a procedure for reviewing the normally open switching units 133 selected among the normally open switching units 133 and moving them.

In step S40, the distribution automation management server 140 selects the normally open opening and closing part 133 of the first order among the set order of the normally open opening and closing part 133, and connects the two power distribution lines 133 connected to the selected normally opening and closing part 133 101, and 102 are set as a simulated power distribution path, and then the normally open switching unit 133 is moved within the simulated power distribution path, and an objective function for the power loss minimization method is calculated.

Specifically, in order to minimize the loss of the distribution, the distribution automation management server 140 compares the sum of the power loss of the distribution line with the minimum capacity of the distribution network in compliance with constraints such as the rated capacity of the line, the voltage drop, Open / close portion 133 should be selected so that the open / The distribution automation management server 140 may set the power loss minimization of the distribution lines as an objective function in order to achieve the minimization of the power loss in the distribution. The information required to calculate the power loss of the distribution lines is the unit impedance value, the load current value, and the length of each section of the electric lines constituting the distribution lines. The distribution automation management server 140 can calculate the load as Equation 1 below assuming that the load is uniformly distributed in each section by the objective function.

[Equation 1]

Ii is the current value of the i-th period, Di is the length of the i-th period and ri is the line resistance between the i-1 and i-th periods. Is the unit impedance value.

In step S50, the distribution automation management server 140 determines whether the objective function of minimizing the current power loss is smaller than the objective function of minimizing the previous power loss, while moving the normally open switching unit 133. [ For example, in FIG. 2, the third distribution line F3 and the sixth distribution line F6, which are linked to the normally open opening and closing part 133 of N31, set the simulated distribution route. If another loss is not reduced even if the normally open switching unit 133 is changed and the normally open switching unit 133 is changed and the power loss is repeatedly calculated in the same manner, It can be minimal.

When the normally open switching unit 133 is moved within the simulated power distribution path, the currents flowing through the two power distribution lines 101 and 102 are supplied to the two power distribution lines only by the corresponding power supply amount of the interval between the normally open switching units 133, The sum of the total currents is not changed. Since the problem of the change of the current is related to the change of the power loss of the two distribution lines, the increase / decrease of the power loss is calculated by applying Equation (2).

&Quot; (2) "

S1 is a section from the output terminal of the first distribution line 101 to the normally open opening and closing section, S2 is a section from the output terminal of the second distribution line 102 to the normally open opening and closing section Im is the current of the moved region, I is the maximum current before moving, and R is the resistance of the distribution lines.

If it is determined in step S60 that the objective function of minimizing the current power loss is smaller than the objective function of minimizing the previous power loss, the normally open switching parts 133 disposed at positions where the objective function of minimizing the power loss is further reduced, To the combination of the positions of the new normally open / close portions 133.

In step S70, the next turn on / off switching unit 133 is selected from the list, and two distribution lines connected to the selected normally open / close unit 133 are set as a simulation distribution path. Then, in the simulation distribution path, Lt; RTI ID = 0.0 > 133 < / RTI >

As a result of the determination in step S80, if the objective function of minimizing the current power loss is not decreased as compared with the objective function of the previous power loss minimization, the distribution automation management server 140 determines that all Open / close portions 133 are checked in order.

As a result of the determination in step S90, the distribution automation management server 140 selects the next-time open-close switching unit 133 in the list if all of the normally open switching units 133 are not reviewed, The two power lines 101 and 102 connected to the power line 133 are set as a simulated power distribution path and the normally open switching unit 133 is moved in the simulated power distribution path to calculate an objective function for the power loss minimization method. The distribution automation management server 140 calculates the objective function and returns to the previous step S50.

As a result of the determination in step 100, the distribution automation management server 140 determines whether the objective function of minimizing the power loss is not further reduced when the order of the normally open switching units 133 is sequentially checked. If the objective function of minimizing the power loss is no longer reduced, the process returns to the previous step S40.

If it is determined in step 110 that the objective function of minimizing the power loss is no longer reduced, the distribution automation management server 140 determines the position of the normally open switching unit 133 for minimizing the power loss.

Through the above process, it is possible to proceed with the initial setting of the distribution view, or to select the position of the normally open opening / closing portion in the subsequent re-adjustment process.

A distribution management system including a distributed power management function will be described with reference to FIGS. 5 and 6. FIG. FIG. 5 is a conceptual diagram schematically showing a distribution management system capable of managing distributed power according to another embodiment, and FIG. 6 is a flowchart showing a distribution management method according to another embodiment.

The Smart Grid is based on a distributed power source that develops near the power grid rather than the traditional centralized power grid. These include renewable energy such as photovoltaic power generation and wind power generation, cogeneration power generation, fuel cells, and energy storage devices. Distributed power supplies have the advantage of being able to flexibly cope with power load fluctuations while reducing investment and transmission and distribution losses in the construction of new transmission and distribution lines. However, one of the problems expected when a distributed power supply is connected to an existing power grid is the single operation of the distributed power supply. In a system linking distributed power sources, if a circuit breaker of a power company substation is opened due to a power system accident or the like, a separated system supplies electric power to a customer using only a decentralized power source. This state is referred to as a sole operation. In this case, when an accident occurs in the power distribution line, the power source at the substation of the power distribution line in which the accident occurred is cut off. At this time, when the distributed power source is operated alone, if an electric power is supplied to a power line where an accident occurs, an operator or an ordinary person who contacts the power line may suffer an electric shock. Also, as with electric shock accidents, there is a possibility that the power device is damaged due to power being supplied to the power device at the accident point. In addition, when the system is reclosed in the state where the single operation is continued, the single system and the power system side are connected asynchronously (voltage, frequency and phase are not the same) It may damage other consumer devices that are wired and connected to the single line. Because of this security and supply reliability issue, if the distributed power is disconnected from the grid, it must detect the stand-alone operation quickly and reliably resolve the distributed power. When the power output and the balance of the load are broken when the single operation is performed, the voltage or frequency fluctuates, so that it can be detected by the voltage relay or the frequency relay. However, if the power output and the load are in equilibrium in general, it is difficult to detect in the relay due to the small voltage or frequency fluctuation. Therefore, in this case, a single operation detecting device capable of reliably detecting is required. For this reason, as shown in FIG. 5, the single operation preventing unit 210 is provided corresponding to the distributed power source 200. [

The distribution automation system capable of managing the distributed power according to the present invention includes a distributed power source 200 connected to a section defined between the opening and closing portions, on / off control of power generation of the distributed power source, And a single-operation preventing unit 210 for managing the single operation.

The distribution automation terminal apparatus 190 according to the present embodiment includes a distributed power supply database (not shown) for registering the stand-alone operation prevention unit 210 connected to the adjacent section of the opening and closing unit 120 corresponding to the power distribution automation terminal apparatus 190, Detects an accident from the received control basis data, and transmits an accident occurrence signal to the registered single operation preventing unit 210 when an accident occurs, and switches the corresponding opening / closing unit to the normally open state.

On the other hand, the stand-alone operation prevention unit 210 can detect the independent operation of the corresponding distributed power source by the step injection unit frequency feedback method. If the stand-alone operation prevention unit 210 determines that the distributed power source alone operates, 200, and then transmits a single operation notification signal to the registered opening /

In addition, when the power distribution automation terminal device 190 detects an accident, it may switch the corresponding opening and closing part 120 to the normally open state and then transmit an accident occurrence signal to the adjacent other opening and closing part. The other open / close units receiving the accident occurrence signal can switch the corresponding open / close units to the normally open state, if necessary, in order to prevent the separate power source 200 from operating alone.

Specifically, a plurality of distribution lines constituting a distribution route to which electric power is supplied from a plurality of distribution class substations, a normally open switching section provided in a normally open state on the distribution lines, A distribution automation management server connected to the distribution automation terminal device; a distributed power source put into the distribution line; and a distributed power source connected to the distribution automation terminal device, A method for controlling a distribution automation system including an independent operation preventing unit for managing a single operation, the method for controlling a distribution automation system capable of distributed power management according to the present invention includes the following steps.

As a first step, the distribution automation management server divides the opening / closing unit into the normally-open / close unit and the normally open / open unit to initialize the initial distribution (S100).

As a second step, the distribution automation terminal devices measure a load current (S200).

As a third step, the distribution automation terminal apparatus transmits and receives control basic data including [the measured load current, the provisional power loss calculated from the measured load current] to the adjacent other distribution automation terminal apparatus (S300).

In a fourth step, it is determined whether or not an accident has occurred from the transmitted control basis data (S350).

In step 5-1 (S500), the power distribution automation terminal device corresponding to the normally open switching part of the opening / closing part compares the calculated provisional power loss and the provisional power loss delivered from the other switching parts Whether to maintain the open state at all times or to determine whether to open the normally open state by determining the target opening / closing part of the opening / closing parts. If the difference between the provisional power loss delivered from the other open / close portions and the calculated provisional power loss is equal to or greater than a predetermined reference value, the fifth step S 500 (S500) The predicted power loss when the normally open state is transferred to the open / close unit that has transmitted the largest provisional power loss value from the load current is calculated, and the calculated predicted power loss is compared with the calculated provisional power loss, .

Step 560 (S360) is carried out when an accident is detected. The accident-detected distribution automation terminal device transmits an accident occurrence signal to the single-operation preventing section, which has previously registered, and switches the corresponding opening / closing section to the normally open state do. Also, after switching to the normally open state, the distribution automation management server may return to the first step according to the condition of the accident.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. have.

Claims (6)

A plurality of distribution lines constituting a distribution route to which electric power is supplied from a plurality of distribution class substations; a normally open switching section provided in a normally open state on the distribution lines; A method for controlling an automation system including an opening / closing unit including a normally-closed closing / opening portion, a distribution automation terminal unit for controlling the opening / closing unit, and a distribution automation management server connected to the distribution automation terminal unit,
A first step in which the distribution automation management server divides the opening / closing unit into an always-open switching unit and a normally open switching unit to set an initial distribution;
A second step in which the distribution automation terminal devices measure a load current;
A third step of transmitting and receiving control basic data including the measured load current and the provisional power loss calculated from the measured load current to the other distribution automation terminal apparatus adjacent to the distribution automation terminal apparatuses; And
The distribution automation terminal corresponding to the normally open opening and closing part of the opening / closing part compares the calculated provisional power loss and the provisional power loss delivered from the other opening / closing parts so as to maintain the open state or to set the target opening / closing part of the opening / And a fourth step of determining whether or not the transfer is performed,
In the fourth step,
When the power distribution automation terminal device determines that the difference between the provisional power loss delivered from the other open / close portions and the calculated provisional power loss is equal to or greater than a predetermined reference value, the largest provisional power loss value is transmitted from the measured load current delivered from the other open / Determining whether or not the normally open state is transferred by comparing the calculated predicted power loss with the calculated provisional power loss,
When the transfer of the normally open state occurs, the distribution automation management server receives status data and control basic data of the switches from the distribution automation terminal devices corresponding to the always-open switching section and the normally-open switching section adjacent to the normally- And receiving the received data,
Further comprising the step of DBizing data for a predetermined time before and after a previous time point of the normally open state when the distribution automation management server transfers the normally open state,
In parallel with the second to fourth steps,
Further comprising the step of re-adjusting the position of the normally open switching unit by calculating the power supply amount and the power loss for each section of the power distribution lines by using the control basis data transmitted from the switches by the distribution automation management server, System control method. delete delete delete The method according to claim 1,
And repeating the second to fourth steps after the fourth step. 6. The method of claim 5,
The power distribution amount and the power loss of each of the power distribution lines by the distribution automation management server using the control basis data transmitted from the switches are measured before the steps 4 to 4 are repeatedly performed And determining whether to re-adjust the position of the normally open switching unit.

Images