KR101266954B1 - System and method for simulating of outage - Google Patents

Abstract

PURPOSE: A simulated power outage system and a method thereof are provided to verify a power outage simulated result by establishing a power outage section for resolving overload using phase shift occurred in a power system. CONSTITUTION: A collection unit collects a power system data by linking with an energy management system(EMS) and a distribution automation system(DAS). A load flow calculation unit(12) calculates power flow of each system using the power system data. A fencing unit(13) divides a plurality of sections by connecting systems having the same phase shift value in the power flow data calculated in the load flow calculation unit. A partition selection unit(14) selects a section to perform a scheduled simulated power outage in the plurality of sections. A simulation unit(15) performs the scheduled simulated power outage with respect to the section selected by the section selection unit in the DAS. A verification unit(16) verifies a degree of power improvement before and after the scheduled simulated power outage and stores the result in database. [Reference numerals] (11) Collecting unit; (12) Load flow calculation unit; (13) Fencing unit; (14) Partition selection unit; (15) Simulation unit; (16) Verification unit

Description

Simulated electrostatic system and method {SYSTEM AND METHOD FOR SIMULATING OF OUTAGE}

The present invention relates to a simulation power failure system and method that can select the section to perform the simulation planned power failure by using the phase shift generated in the distribution system and evaluate the degree of power improvement.

The power supplied to the consumer from a power station or power plant will cause phase shifts during the supply, which is important information for determining the overload area. When overload occurs in the consumer side, frequency fluctuation occurs on the power system, and the frequency drop or rise causes black out phenomenon irrelevant to the reserve power. Particularly, when a frequency drop or power generation drop occurs due to an overload, a partial power failure for overload resolution is inevitable. In order to establish a partial power outage plan, there is a need for a method for comprehensively analyzing transmission and distribution networks, and a system for systematically establishing and managing a partial power outage plan is required.

Currently, the electric power grid is composed of a transmission network and a distribution network, and there is a problem in that the grid management system is dually operated by the grid management system and the distribution network management system. On the other hand, "Song-sang Lee et al., Distributed Bird Calculation for Distribution System, Proceedings of the Korean Institute of Electrical Engineers Fall Conference 2005, 11 Nov. However, there is no discussion on partial power outage measures to overcome the overload.

The present invention relates to a simulation electrostatic system and method that can select the electrostatic zone for overload relief by using the phase shift occurring in the distribution system.

In addition, the present invention relates to a simulated power failure system and method that can virtually verify the power failure results in order to minimize the damage during the actual planned power outage.

The simulation power failure system of the present invention is connected to the power supply automation system (EMS) and the distribution automation system (DAS) collecting unit for collecting the power system data; A tidal current calculation unit that calculates electric current of each system using the power system data; A fencing unit which connects branches having the same phase shift value among the power tidal current data calculated by the tidal current calculation unit and divides them into a plurality of sections; A partition selection unit that selects a section to perform a simulated power failure among the plurality of sections; A simulation unit configured to perform a simulation plan blackout for a section selected by the partition selection unit on the distribution automation system; And a verification unit for evaluating the degree of power improvement before and after the simulation planned power outage and storing it in a database.

The verification unit may evaluate the degree of power improvement by using the power flow data before and after the simulation planned power failure received from the flow calculation unit.

The verification unit may perform the verification through a difference between a reference frequency and a frequency value of power before and after the simulation planned power failure received from the power supply automation system.

The reference frequency may be 60 Hz.

The partition selection unit may select a section to which the systems having the maximum phase shift value are connected as a section to perform the simulation planned blackout.

The partition selection unit may select a section to which the systems having the phase shift value of about 6 to 7 degrees or more are connected as a section to perform the simulated power failure.

The partition selection unit may select a section to sequentially perform the simulated power failure from a section to which lines having a descending phase shift value are connected from a section to which lines having the maximum phase shift value are connected.

The partition selection unit may select a partition to execute the simulated power outage using data on the contract type, contract capacity, type of business, and history of the systems.

The simulation power failure method of the present invention includes a collection step of collecting power system data in association with the power supply automation system (EMS) and the distribution automation system (DAS); A flow calculation unit calculating a power flow of each system using the power system data; A fencing unit dividing the lines having the same phase shift value among the power tidal flow data calculated by the tidal current calculation unit into a plurality of sections; A section selecting section for selecting a section to perform a simulated power outage among the plurality of sections; Performing a simulation plan blackout for a section selected by the partition selection unit on the distribution automation system; And a verification unit evaluating a degree of power improvement before and after the simulation planned power failure and storing the data in a database.

The inventors simulated electrostatic system and method can select the electrostatic zone for overload relief by using the phase shift generated in the power system.

In addition, the present invention can virtually verify the result of the power failure so as to minimize the damage during the actual planned power outage.

1 is a block diagram of a simulation electrostatic system according to an embodiment of the present invention,
2 is a flow chart of a simulated power failure method according to an embodiment of the present invention, and
3 is an exemplary view of executing a simulated power failure of a simulated power failure system according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components, and the same reference numerals will be used to designate the same or similar components. Detailed descriptions of known functions and configurations are omitted.

1 is a block diagram of a simulation electrostatic system according to an embodiment of the present invention. Simulation power failure system according to an embodiment of the present invention is connected to the power supply automation system (EMS) and the distribution automation system (DAS) collecting unit 11 for collecting power system data; A tidal current calculation unit 12 that calculates electric current of each system using the electric power system data; A fencing unit 13 which connects branches having the same phase shift value among the power flow data calculated by the flow calculation unit 12 and divides them into a plurality of sections; A partition selection unit 14 for selecting a section to perform a simulated power failure among a plurality of sections; A simulation unit 15 for performing a simulation plan blackout for the section selected by the section selecting section 14 on the distribution automation system; And a verification unit 16 for evaluating the degree of power improvement before and after the execution of the simulated power failure and storing it in a database.

The collection unit 11 may be connected to the power supply automation system and the power distribution automation system to collectively collect system data acquired by each system. Specifically, the collection unit 11 may collect data on electric power such as distribution line operation information, fault information, and voltage / current from a substation to a consumer from a distribution automation system, and may implement a SCADA (Supervisory Control and Data Acquisition) system. This can be used to collect data on the amount of power generated and transmissions produced at each power plant from a feed automation system. The collection unit 11, the power supply automation system, and the power distribution automation system can perform data communication using a standard protocol such as ICCP (InterControl Center Communications Protocol) or TCP / IP. The power system data collected by the collection unit 11 may include, for example, switch information connected to each system, information about an electric quantity such as voltage / current, and frequency information of power supplied from a power exchange feed station.

The tidal current calculation unit 12 may calculate the electric current tidal power of each system using the power system data collected by the collecting unit 11. In calculating the power flow, the flow calculation unit 12 first uses a distributed flow calculation algorithm to calculate the power flow in the distribution system, and uses the boundary information to perform the combined flow calculation. We can use the algorithm to exchange after the convergence of the tide calculations. This is because each algal calculation solution can be used for the transmission and distribution system, because the tide calculation of the transmission and distribution system has to be performed separately because there is a big difference in the network topology and parameter values. Algae calculation for each distribution system is carried out in a distributed manner, and algae for the entire system is performed through combined algae calculation based on separate calculations for transmission and distribution systems. The algae value can be obtained. The tidal current calculation unit 12 may integrally calculate and manage the electric current of the entire transmission / distribution network by using the electric current tidal flow calculation method as described above. Distributed algae calculation for distribution system, Korean Institute of Electrical Engineers Fall Conference, 2005.11: 298-300 ". The tidal current calculation unit 12 may obtain active power, reactive power, voltage value, and phase for each system including a power supply station, a power station, and a substation through power flow calculation, and set a phase value supplied from a power supply station or a power station to zero. The phase value of the power used in each system can be the phase shift value of the power used in each system. The relationship between the active power, reactive power, voltage, and phase value is, for example, the Newton-Raphson technique. method).

The fencing unit 13 may be divided into a plurality of sections by connecting lines having the same phase shift value among the power flow data of the tidal current calculation unit 12. The fencing unit 13 may be divided into virtual compartments by connecting lines having the same phase shift value on the distribution network of the distribution automation system. In general, the power becomes phase difference in proportion to the distance from the power plant or feeder to the grid or load, and the phase difference becomes larger in the load-dense area. Accordingly, the fencing unit 13 may be divided into a plurality of sections constituting the closed space by connecting the systems having the same phase shift in proportion to the distance from the power plant or the power supply station.

The division selection unit 14 may select a division to be subjected to the simulation planned power failure among the plurality of divisions divided by the fencing unit 13. The partition selection unit 14 may select a section to perform the simulation planned power failure based on the phase shift value. For example, the section selecting unit 14 may select a section connecting the systems in which the phase shift value is maximum as a section to perform the simulation planned power failure. In the case of domestic power distribution system, a phase shift of about 7 degrees may occur from a power supply station or a power plant to a load stage. Therefore, the partition selector 14 may perform a simulated blackout of a section connecting the systems having a phase shift value of 7 degrees. Can be selected as a block. There may be one or a plurality of partitions to be subjected to the simulation planned outage selected by the partition selection unit. For example, a phase shift value is performed to perform simulation scheduled outages for all the plurality of partitions and accumulate the results in the database. From the section connecting the largest systems, the sections connected in descending order based on the phase shift value can be selected as the sections to which the simulated power failure will be sequentially performed. The section selection unit 14 may select a section to perform the simulation planned power outage using the data on the contract type, contract capacity, industry type and history of the respective systems. The contract type can be classified into residential power, industrial power, business power, and agricultural power, and the contract capacity means the amount of power to be used by the customer system in advance has been agreed with KEPCO. Sector and usage history refers to the characteristics of the customer system and the amount of power used in the past. The contract type, contract capacity, sector and usage history can be stored in the database. The division selection unit 14 may exclude, for example, from the division to be subjected to the simulated power failure even if the phase shift in the case of industrial power and agricultural power in the contract form is large, and the contract power is large or the past power by the use history. Highly busy systems can be excluded from the compartment where the simulated power outage will be implemented. According to the characteristics of each region, the criteria for selecting the divisions for the simulated power outage based on the contract type, the contract capacity, the type of business, and the history of use are implemented on the database in the form of assigning the risk weight due to the planned outage for each system by the manager. Can be.

The simulation unit 15 is divided by the fencing unit 13 on the power distribution network, and can perform a simulated power failure for the section selected by the partition selecting unit 14. The simulation unit 15 simulates through the opening and closing operation of the switch adjacent to the system selected by the partition selection unit 14 by using the switch information connected to each system among the power system data collected by the collecting unit 11. We can carry out planned blackout. The simulation unit 15 can execute the simulated power failure by virtually executing the switch opening and closing operation on the distribution network of the distribution automation system.

The verification unit 16 may evaluate the degree of power improvement before and after the execution of the simulation planned power failure performed by the simulation unit 15. The degree of power improvement may be, for example, an increase in an active power value, a decrease in a reactive power value, or an increase in a voltage value before or after a simulated power failure. The degree of power improvement can be evaluated based on the frequency of the electrical signal supplied from the power supply station. Generally, in the domestic system, an electrical signal having a frequency between 59.8 Hz and 60.2 HZ based on a 60 Hz frequency is determined as a normal signal. However, when an overload occurs, a frequency decrease occurs. Accordingly, if the frequency of the electric signal does not reach 59.8 Hz, a black-out phenomenon may occur even if the reserve power is present. Therefore, the verification unit 16 indicates whether the frequency of the electrical signal returns to the range of 59.8 Hz or 60.2 Hz when the simulation planned power failure is performed using the frequency information of the power or voltage supplied from the power supply station among the power system data. In this way, the degree of power improvement for the simulated power outage can be evaluated.

2 is a flow chart of a simulated power failure method according to an embodiment of the present invention.

Simulated power failure method according to an embodiment of the present invention is a collection step 11 collecting power system data in association with the power supply automation system (EMS) and power distribution automation system (DAS); A calculation step of calculating a power flow of each system by the flow calculation unit 12 using the power system data; A step of fencing unit 13 dividing the lines having the same phase shift value among the power tidal flow data calculated by the tidal current calculator 12 into a plurality of sections; A selecting step of selecting, by the partition selecting unit 14, a section to perform a simulated power failure among the plurality of sections; Performing simulation simulation power failure of the section selected by the section selecting section 14 on the power distribution automation system; And a verification step in which the verification unit 16 evaluates the degree of power improvement before and after the simulation planned power failure and stores it in a database.

The collection unit 11 collects power system data in connection with a power supply automation system and a power distribution automation system. In detail, the collecting unit 11 may collect data on electric power such as distribution line operation information, fault information, and voltage / current from a substation to a customer from a distribution automation system, and calculate a SCADA (Supervisory Control and Data Acquisition) system. This can be used to collect data on the amount of power generated and transmissions produced at each power plant from a feed automation system. The collection unit 11, the power supply automation system, and the power distribution automation system can perform data communication using a standard protocol such as ICCP (InterControl Center Communications Protocol) or TCP / IP. The power system data collected by the collection unit 11 may be, for example, switch information connected to each system, information about an electric quantity such as voltage / current, and frequency information of power supplied from a power exchange feed station (S201).

The tidal current calculation unit 12 may calculate the electric current tidal power of each system using the power system data collected by the collecting unit 11. The tidal current calculation unit 12 may use a distributed tidal current calculation algorithm and a combined tidal current calculation algorithm to calculate the integrated power tidal current for the transmission / distribution system, and a detailed calculation method is as described with reference to FIG. 1 (S202).

The fencing unit 13 may be divided into a plurality of sections by connecting lines having the same phase shift value among the power flow data of the tidal current calculation unit 12. The fencing unit 13 may be divided into a plurality of sections constituting a closed space by connecting the systems having the same phase shift in proportion to the distance from the power plant or the power supply station on the distribution network of the distribution automation system (S203).

The division selection unit 14 may select a division to be subjected to the simulation planned power failure among the plurality of divisions divided by the fencing unit 13. The section selecting unit 14 may select a section to perform the simulated power outage based on the phase shift value, and perform the simulated power outage for the section to which the points at which the phase shift value is maximum or the systems having the phase shift value of 7 degrees are connected. Can be selected as the compartment to be. In addition, the partition selector may use data for contract type, contract capacity, type of business, and history of use in addition to the phase shift value to select the simulated power failure section, and the detailed criteria or method thereof are the same as those described with reference to FIG. 1 (S204). ).

The simulation unit 15 is divided by the fencing unit 13 on the power distribution network, and can perform a simulated power failure for the section selected by the partition selecting unit 14. The simulation unit 15 simulates through the opening and closing operation of the switch adjacent to the system selected by the partition selection unit 14 by using the switch information connected to each system among the power system data collected by the collecting unit 11. We can carry out planned blackout. The simulation unit 15 can execute the simulated power failure by virtually executing the switch opening and closing operation on the distribution network of the distribution automation system (S205).

The verification unit 16 may evaluate the degree of power improvement before and after the execution of the simulation planned power failure performed by the simulation unit 15. As shown in FIG. 1, the reference mark related to the degree of power improvement performed by the verification unit 16 may be active power, reactive power, voltage, or frequency (S206).

The division selecting unit 14 may select another division to perform the simulation planned power failure when the degree of power improvement evaluated by the verification unit 16 does not reach a preset reference value. For example, when the frequency of the power supplied from the power supply station after the simulated power outage is less than 59.8 Hz or exceeds 60.2 HZ, the compartment selecting unit 14 may select another compartment to perform the simulated power outage.

The simulation unit 15 repeatedly performs a simulation blackout for the simulated power failure section selected by the partition selection unit 14, and the verification unit 16 repeatedly measures the degree of power improvement based on the frequency of the power supplied from the power supply station. Can be evaluated

If the frequency value of the power supplied from the power supply station has a value within the range of 59.8 Hz to 60.2 HZ due to the simulation scheduled power outage, the division selecting unit 14 may stop selecting the section for the simulated power failure.

3 is an exemplary view of executing a simulated power failure of a simulated power failure system according to an embodiment of the present invention.

In the case of Figure 3 is an example of selecting the partitions connecting the systems having a phase shift of 5 to 7 divided into three sections in the grid connected to each distribution network, the partition connecting the systems having a phase shift of 7 as the simulated power outage area. In the case of FIG. 3, a simulation plan was selected for the partitions connecting the grids having a phase shift of 7, but the partitions connecting the grids with a phase shift of 6 and the grids connecting the grids with a phase shift of 5 were sequentially selected. Can be selected as a blackout area.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

10: mock outage system
11: collecting section
12: bird calculation unit
13: fencing
14: Parliamentary Government
15: simulation
16: verification unit

Claims (9)

A simulated electrostatic system implemented on a computer readable recording medium,
A collection unit connected to a power supply automation system (EMS) and a power distribution automation system (DAS) to collect power system data;
A tidal current calculation unit that calculates electric current of each system using the power system data;
A fencing unit which connects branches having the same phase shift value among the power tidal current data calculated by the tidal current calculation unit and divides them into a plurality of sections;
A partition selection unit that selects a section to perform a simulated power failure among the plurality of sections;
A simulation unit configured to perform a simulation plan blackout for a section selected by the partition selection unit on the distribution automation system; And
Verification unit for evaluating the degree of power improvement before and after the simulated power outage stored in the database
Mock outage system comprising a.
The method of claim 1,
And the verification unit evaluates the degree of power improvement by using the power flow data before and after the simulation planned power failure received from the current calculation unit.
The method of claim 1,
And the verification unit evaluates the degree of power improvement by using a difference between a reference frequency and a frequency value of power before and after the simulated power failure received from the power supply automation system.
The method of claim 3, wherein
And the reference frequency is 60 Hz.
The method of claim 1,
The partition selection unit selects a section to which the systems having the maximum phase shift value are connected as a section to perform the simulation planned outage.
The method of claim 1,
The partition selection unit selects a section to which the systems having the phase shift value of 7 degrees are connected as a section to perform the simulation planned outage.
The method of claim 1,
The partition selection unit selects a section to which the systems having a phase shift value in descending order from the sections to which the systems having the maximum phase shift value are connected as a section to sequentially perform the simulated power failure.
The method of claim 1,
The division electoral system selects a section to perform the simulation planned outage using data on the contract type, contract capacity, industry type and history of the systems.
A simulated blackout method implemented by a processor operating as a computer readable recording medium,
A collecting unit collecting power system data in association with a power supply automation system (EMS) and a power distribution automation system (DAS);
A flow calculation unit calculating a power flow of each system using the power system data;
A fencing unit dividing the lines having the same phase shift value among the power tidal flow data calculated by the tidal current calculation unit into a plurality of sections;
A section selecting section for selecting a section to perform a simulated power outage among the plurality of sections;
Performing a simulation plan blackout for a section selected by the partition selection unit on the distribution automation system; And
The verification unit evaluates the degree of power improvement before and after the simulated power outage and stores it in a database.
Simulated power failure method comprising a.

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