KR102099568B1 - Fault management device for distribution network interconnected with distributed generator and method thereof - Google Patents

Abstract

An embodiment of the present invention relates to an automatic failure handling apparatus and method for a distribution system, and a technical problem to be solved is to reduce the possibility of errors in failure occurrence information by a wiring automation terminal device, section load inequality rate, and distributed power Considering the effects of the section, the possibility of error in section load processing and the possibility of error recovery are reduced to reduce the possibility of error, and considering the status of the switchgear, the automatic failure handling of the distribution system with distributed power supply that can reduce the possibility of error when performing the failure recovery sequence It provides an apparatus and a method.
To this end, the present invention is a failure occurrence information filtering unit for filtering and removing error failure occurrence information among failure occurrence information of a distribution line received from a plurality of distribution automation terminal devices; A failure section determination unit for determining a failure section using the filtered and remaining failure occurrence information; A failure recovery solution deriving unit for deriving a failure recovery solution for the failure section; And, an automatic failure handling apparatus and method of the distribution system associated with distributed power supply including an operation exception processing unit for processing the operation exception during the failure recovery.

Description

Fault management device for distribution network interconnected with distributed generator and method thereof

An embodiment of the present invention relates to an automatic failure handling apparatus and method for a distribution system in which distributed power is connected.

A method of handling a failure in a conventional power distribution system is shown in FIG. 1. As can be seen in FIG. 1, in the conventional case, a fault current is measured by a feeder remote terminal unit (FRTU) 11 installed on a distribution line and acquiring data such as voltage and current of the line. The distribution automation terminal device 11 determines that the failure occurrence condition is satisfied when the current is higher than a certain level and the voltage is lower than the predetermined level (50%), and the failure detection signal (FI; Fault Indication) is sheared as the upper measurement server. And transmits to a front end processor (FEP) 12. The FI signal transmitted to the front end processing device 12 is transmitted and stored in the distribution automation main server 13, and a failure occurrence alarm is transmitted to the HMI 14 of the operator and transmitted to the operator.

The procedure after the operator acknowledges the failure occurrence alarm is shown in FIG. 2. First, when the failure occurrence alarm is confirmed, the location of the failure is estimated by the presence or absence of the failure occurrence information (FI) transmitted to the operator from each distribution automation terminal device (FRTU). At this time, in the normal radial line, the section after the distribution automation terminal device (FRTU) where the failure occurrence information (FI) was finally generated is determined as the failure section. After determining the failure section, the power distribution side and load side distribution automation terminal device (FRTU) is opened to isolate the failure section by breaking the failure point from other sections. After separating the fault section, power is supplied to the power supply section of the fault section by re-supplying a circuit breaker (CB) or a recloser for the line in the substation on the power supply section. For loads on the load side of the fault section, the optimal link line is searched according to the number of link lines in the section and the operating state of the link line, and a sequence solution for switching the healthy section, which is the section on the load section of the fault section, is derived using the link line. In accordance with this derived solution, the failure recovery procedure is completed by switching the automatic distribution switch to the optimal linking line.

The problems of the conventional fault handling method and its structure are as follows.

1) Possibility of error in failure occurrence information (FI) by distribution automation terminal device (FRTU)

The types of faults that can occur in the distribution line are largely short-circuit faults and ground faults, and the short-circuit faults have a very low fault current, so the probability of failure of the fault information (FI) is very low. On the other hand, in ground faults, which account for about 70% of distribution line failures, three-phase unbalanced current flows not only in the power supply-side section (Upstream) from the point of failure to the power supply, but also in the section after the breakdown section, which causes the neutral line after the fault section ( N phase) malfunction indicator malfunctions. For example, assuming that a ground fault has occurred in the A phase, a large fault current flows to the A phase in the line (power side) before the fault section, and the line becomes unbalanced due to the large fault current. Therefore, the sum of currents in the case of an unbalanced 1-line ground fault is not 0, but the current value exiting from the point of failure to the ground, which becomes the current flowing in the neutral line (N phase). Since the phase A current hardly flows in the line connected after the failure period, the load side also becomes a three-phase unbalanced state, and a three-phase unbalanced current flows in the N phase. Due to this unbalanced current, the failure occurrence information on the N phase is generated and transmitted to the operator in the distribution automation terminal device installed after the failure period. When this error failure occurrence information is transmitted to the operator, when the failure region is determined using this error failure occurrence information, the failure region is incorrectly determined, and the failure processing time for separating the failure region and transferring the healthy region is delayed to the customer. The duration of the failure is longer, and the cost of the outage increases.

In addition, a phenomenon in which the error of the failure occurrence information (FI) is further weighted by a distributed power supply that is increasingly connected to a distribution line. For example, if a fault occurs in a line connected to a distributed power supply, the distributed power supply contributes to the flow of a fault current, and thus, even when the distributed power supply is not connected, the failure section information (FI) does not occur, even in the load section. When the power supply is connected, if the connection location of the distributed power supply is on the load side of the failure section, failure occurrence information FI may also occur on the load side section of the failure section. This may also cause confusion in the operator's determination of the failure section, which may cause the failure section to be judged incorrectly, thereby causing a phenomenon in which damage to the line of failure occurs and the cost of power failure increases.

2) Section load processing error due to non-consideration of section load inequality and distributed power

In order to deal with the failure occurring in the distribution line, the operator must know the load of the load-side section of the fault-producing section, and when these sections are transferred, do not exceed the allowable current in the line connected to these sections or the voltage drop falls within the standard range. It is possible to select the optimum link line by judging the location. To this end, the conventional method uses the switch current measured by the distribution automation terminal device, and the current flowing through the distribution line due to the radial characteristics of the distribution line uses the characteristic that the current value decreases from the power source side to the load side and the terminal side to the power source terminal in one section. The section load is stored by subtracting the measurement current of the load-side terminal device from the measured current of the device, and only the maximum weekdays and holidays of the individual sections are stored. It can be calculated.

Also, by calculating the measurement current on the load side from the measurement current on the power supply side by simple subtraction, the direction of the measurement current in the switch is considered because current can flow in the section where the distributed power supply can occur in the distribution line connected to the distributed power supply. If not, the section load can be estimated to be larger than actual.

Due to the unevenness of the section load and the undirected consideration of the directionality of the current due to the distributed power, the section load may be excessively calculated, which may cause a problem that the optimal solution cannot be obtained when solving the problem handling. The failure to perform the processing results in a phenomenon in which damage to the line of the failure occurs and the cost of the power failure increases due to an increase in the duration of the failure.

3) Failure recovery based on unconsidered distribution power

When performing fault handling, in order to select the optimal route among the lines connected to the healthy section, which is the load-side section of the fault section, and perform the operation sequence of the switchgear for restoring the healthy section, the healthy section is switched and connected When the load is exceeded by the line, the allowable capacity and voltage drop in the corresponding link line are calculated not to exceed the standard range, and the priority of multiple link lines is selected based on this, and the switchgear is operated by the link line with high priority. To perform a healthy section recovery. At this time, when calculating the allowable capacity and voltage drop, simply add the section load of the healthy section to the sum of the section loads of the link line, and the voltage drop is calculated by assuming a radial distribution system.

However, the problem becomes a little complicated in the distribution line in which the distributed power supply is connected. When distributed power is connected to the load-side healthy section of the fault section, when this section is transferred and transferred to the connected line, the load status of the connected line that is switched according to the location of the transfer in the connected line according to the output of the distributed power Accordingly, a voltage problem such as overvoltage may occur, and the allowable capacity of the link line may be increased according to the distributed power output. Therefore, if the optimal linking line is not selected in consideration of distributed power, problems may arise in the operation of the line, such as overvoltage, in the link that receives a healthy section where the distributed power is included, resulting in malfunction of the electrical equipment of the customer of the link. Can cause

4) Possibility of error when performing a failure recovery sequence according to the consideration of the switchgear status

After the priority of the link line is determined, and the optimal fault recovery sequence is calculated, the operator operates the automatic distribution switch in sequence according to the sequence. At this time, since the state of the switchgear when performing the failure recovery sequence is not taken into account, errors in the operation of the switchgear and the operation of the protection device on the connected line may occur when performing the failure recovery sequence. For example, if the switch state information such as a defective battery condition of the switch to be operated and a switch gas pressure drop are not reflected, the probability of failure of the opening and closing operation of the switch is high due to this reason when performing the sequence. In addition, if the failure detection suppression function of the protection device of the link line is not operated, the protection device of the link line operates and the power supply to the link line is interrupted by the occurrence of a phenomenon such as an inrush current due to a sudden increase in load when switching over the healthy section. Can be. Therefore, consideration should be given to the current state of these switchgears and to set the function of the protection devices on the link.

In addition, when operating the target switch corresponding to the failure recovery sequence, the switch operation may not be possible due to an instantaneous communication failure, etc., and thus the previously derived fault handling switch operation sequence may not be suitable, and the operation sequence It is necessary to recalculate. For example, if two outage zones occur due to a failure that occurred, if one power outage zone is unable to proceed with the sequence due to failure of the switchgear operation when the other power outage zone is switched after recovery is completed, the operator can operate the current switchgear and track. It is necessary to perform the re-operation by grasping the connection status, and the possibility of human error increases due to the tension and the embarrassment of the operator when the urgent failure processing is performed, thereby increasing the possibility of erroneous operation.

Therefore, if the failure handling switchgear is operated and the current switchgear status is not reflected and the possibility of failure in the sequence operation is not prepared, it is difficult to perform the operation sequence procedure in the middle of the failure handling operation, thereby increasing the duration of the failure and the cost of failure of the customer. Is done.

In this case, when various distributed power capacities are connected, the case of violation of the operating conditions of the connected line is shown in FIGS. 3A to 3C when power failure recovery is performed according to the positive and load conditions of the connected line.

First, in the distribution diagram of FIG. 3A, assuming that the distributed power DG1 is connected to the A line and the distributed power DG2 and the load are connected to the C line, if a failure occurs in the A line, the A line section ( Section) C should be connected to the C line to smoothly supply power to healthy sections. At this time, by simulating the values of the voltage and current that may occur during the connection according to the DG capacity, load conditions, and appreciation of the connected C line, a table as in FIG. 3B can be obtained. Referring to FIG. 3B, the shaded portion of the voltage column indicates a case in which the operating condition is violated beyond the line voltage maintenance range due to the connection, and in the current column, the shaded portion also operates beyond the line allowable current due to the connection. It shows the case where the condition is violated. If a power outage recovery plan is established without considering distributed power, it means that there is a high possibility that the operating conditions of the power distribution line may be violated. To solve this, a power outage recovery plan must be established in consideration of distributed power to operate a stable power distribution line. can do. That is, it is possible to maintain the line voltage and current within a specified voltage and current range. This is shown in Figure 3c. As shown in FIG. 3C, the lower specification limit and the upper specification limit represent a range in which the line voltage should be maintained. In general, it should be maintained at 0.95 ~ 1.05 (pu). If you simulate by varying the distributed power supply capacity and line conditions, you can see that many cases exceeding the upper limit of the voltage specification occur.

As described above, the problems of the prior art when handling the distribution system failure can be summarized into four types. First, processing problems due to errors in distribution automation terminal device failure occurrence information (FI), second, section load error handling problems without considering the unevenness of distribution line section load and distributed power effect, and third, power outage due to unconsidered distributed power It can be divided into the problem of repairing and error handling, and the problem of considering the current status of the last fourth distribution automation switch and considering the occurrence of exceptions during the failure recovery sequence. The technical principle of the present invention for solving the problems of the prior art is summarized as follows.

(A) Distribution automation terminal device failure occurrence information (FI) processing problem due to an error occurrence

When a failure occurs in the distribution line, the error handling problem of the failure occurrence information (FI) of the distribution automation terminal device is filtered by the operator through the failure occurrence information (FI) filtering step using a rule-based reasoning engine to filter the error FI By presenting the exact failure section, the operator was prevented from performing erroneous operation due to the failure section determination error.

(B) Section load error handling problem without considering the inequality rate of distribution line section load and the effect of distributed power

The error in deriving the fault handling solution that occurs by not considering the inequality rate and distributed power for the section load used in handling the fault by storing the section load of the distribution line during normal operation before failure occurs is reflected when modeling the existing distribution line Modeling a distributed power supply that has not been done with the load, reflecting the direction and amount of load current, and managing the section load as a pattern solves the error in section load calculation due to the consideration of the inequality ratio of the section load. To this end, in the present invention, the section of the distribution line section is subdivided to calculate the section load by reflecting the load and distributed power, and the steps of pattern management and generation of the section load are added.

(C) Problems with error handling by deriving power outage recovery due to unconsidered distributed power

In order to solve the problem of an error occurring in the process of deriving an electrostatic recovery solution due to unconsidered distributed power, the present invention adds an algae calculation step to a step before deriving an electrostatic recovery solution to perform algae calculation, and the calculated linkage The priority of the link line was determined using the allowable current and voltage drop values of the line.

(D) Handling problems due to consideration of the current status of distribution automation switchgear and the occurrence of exceptions during failure recovery sequence

In order to recover distribution line failures, the exceptions that occur during the execution of a failure recovery sequence are prevented in advance, and a list of non-operable switches is generated to process the exceptions, and a failure recovery sequence excluding this is generated using this list. In addition, in order to handle the exceptions that occurred during the execution of the failure recovery sequence, the failure recovery sequence was subdivided into stages, and the exception handling and recovery were added to solve the problem.

The automatic failure handling apparatus of the distribution system in which distributed power is linked according to an embodiment of the present invention filters failure occurrence information to filter and remove error failure occurrence information among failure occurrence information of the distribution line received from multiple distribution automation terminal devices part; A failure section determination unit for determining a failure section using the filtered and remaining failure occurrence information; A failure recovery solution deriving unit for deriving a failure recovery solution for the failure section; And an operation exception processing unit that processes an operation exception during the failure recovery.

The failure occurrence information filtering unit may use a magnitude of a fault current and a direction of a fault current transmitted from the distribution automation terminal device to the upper central control device when the fault occurrence information is detected.

When the failure occurrence information filtering unit receives the lockout signal from the breaker of the fault line, the load side switchgear of the breaker is searched to check whether the failure occurrence information has occurred from the load side switchgear, and among the failure occurrence information generated from the load side switchgear The error-failure occurrence information is filtered, and the failure-section determining unit uses the filtered and remaining fault occurrence information to breakdown the load-side switchgear of the circuit breaker located at the end of the circuit breaker that generated the failure occurrence information among the load-side switchgear of the breaker. It can be designated as a power supply side switch, and the load side switch of the power side switch can be designated as a load side switch of the failure section.

The present invention may further include a section load calculation section for calculating section loads and a load pattern generation section for generating load patterns by reflecting the effects of section load inequality and distributed power of the distribution line.

The section load calculation unit periodically measures and synchronizes the field current of the switch in the field terminal device data processing device to which a plurality of distribution automation terminal devices are connected, stores the synchronized switch measurement current in a storage database, and is stored in the storage database The periodic load is calculated and corrected using a synchronized switch measurement current having a period, and it is stored in the storage database, and the load pattern generator can derive the section load pattern and store it in the storage database.

The load current can be simultaneously measured and synchronized one by one per distribution automation terminal device, and the inequality rate can be eliminated through the synchronized measurement.

Further comprising an algae calculation unit for performing the algae calculation, the failure recovery and derivation unit may determine the priority of the link line using the allowable current and voltage fluctuation values calculated from the algae calculation unit.

The manipulation exception processing unit may generate a list of inoperable switchgears and use the list to generate a failure recovery sequence excluding the inoperable switchgears.

The above list may be any one of a control inhibiting switch, a manual control switch, a renewable switch, a poor communication switch, a gas pressure reducing switch, a self-diagnostic error switch, or a battery over-discharge switch.

The automatic failure handling method of a distribution system in which distributed power is connected according to an embodiment of the present invention is a filtering of failure occurrence information by filtering and removing error failure occurrence information among failure occurrence information of a distribution line received from a plurality of distribution automation terminal devices step; A fault section determination step of determining a fault section using the filtered and remaining fault occurrence information; A fault recovery solution deriving step of deriving a fault recovery solution for the fault section; And an operation exception processing step of processing an operation exception during the failure recovery.

In the present invention, an improved fault handling apparatus and a method thereof are proposed in order to solve errors occurring during fault handling due to distributed power. A method for determining a failure section through a failure signal filtering of a distribution automation terminal device proposed in the present invention, a section load modeling using a distributed power supply and a method for generating a load pattern through it, and a flow calculation to recover from a failure in a distribution line connected to a distributed power supply Through the smart power distribution operating system that applied the fault recovery process, which consists of an optimal recovery method and a method of handling exceptions that occur when operating the switch for fault recovery, errors about fault recovery in the distribution line with distributed power Can be removed.

The present invention can have the following technical effects.

1) Through the filtering of the failure occurrence information (FI) transmitted from the distribution automation FRTU, a relatively accurate failure section can be determined compared to the conventional method.

2) An accurate optimal recovery solution can be derived through accurate modeling of the section load, and a method of deriving an optimal recovery solution through load pattern generation and tide calculation.

3) By providing a method for handling exceptions that occur when operating switchgear to recover from faults, it is possible to reduce human errors that can occur when operating switchgear by operators.

The present invention can have the following economic effects.

1) Compared to the existing method, it is possible to reduce the search time of the fault section of the operator, and also to significantly reduce the breakdown time through the automation of the fault recovery process to perform automatic fault handling. Index) can improve the reliability of the distribution system.

1 is a schematic diagram showing a configuration of a failure processing apparatus according to the prior art.
Figure 2 is a schematic diagram showing a flow diagram of a failure process according to the prior art.
FIG. 3A shows the state of data measurement in the prior art, FIG. 3B shows the results of data collection, and FIG. 3C shows the voltage process capability.
Figure 4 is a schematic diagram showing the overall flow of the fault recovery according to the present invention and the configuration of the device.
5 is a table showing a fault information filtering process according to the present invention.
6 is a schematic diagram showing a fault information (FI) filtering process according to the present invention.
7 is a schematic diagram showing an interval load calculation and pattern derivation process according to the present invention.
8 is a schematic diagram showing an example of uniformly distributed load modeling according to the present invention.
9 is a schematic view showing a process for deriving an optimal failure recovery plan according to the present invention.
10 is a schematic diagram showing a flowchart of handling exceptions when performing a failure recovery operation according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments of the present invention are provided to more fully describe the present invention to those of ordinary skill in the art, and the following embodiments can be modified in various other forms, and the scope of the present invention is as follows. It is not limited to the Examples. Rather, these examples are provided to make the present disclosure more faithful and complete, and to fully convey the spirit of the present invention to those skilled in the art.

The terminology used herein is used to describe a specific embodiment and is not intended to limit the present invention. As used herein, singular forms may include plural forms unless the context clearly indicates otherwise. Also, as used herein, “comprise” and / or “comprising” specifies the shapes, numbers, steps, actions, elements, elements and / or the presence of these groups. And does not exclude the presence or addition of one or more other shapes, numbers, actions, elements, elements and / or groups.

Figure 4 is a schematic diagram showing the overall flow of the fault recovery according to the present invention and the configuration of the device.

As shown in FIG. 4, the automatic fault handling method (device) 100 of the distribution system according to the present invention is a distribution line received from a plurality of distribution automation terminal devices 110 and a field terminal device data processing device 120 A failure occurrence information filtering step of filtering out and removing error failure occurrence information from the failure occurrence information of the (fault occurrence information filtering unit 131); A fault section determination step (failure section determination unit 132) for determining a fault section using the filtered and remaining fault occurrence information; A failure recovery optimal solution derivation step (a failure recovery optimal solution derivation unit 133) for deriving a failure recovery optimal solution for a failure section; An operation exception processing step (operation exception processing unit 134) for processing the operation exception during the failure recovery optimal solution; Section load calculation step to calculate section load by reflecting the influence of the section load inequality rate and distributed power of the distribution line by the information obtained from the plurality of distribution automation terminal devices 110 and the field terminal device data processing device 120 (section Load calculation unit 135); And a load pattern generation step (load pattern generation unit 136) for generating a load pattern. Here, the present invention further includes a storage database 137 for storing section loads and load patterns, and the information stored in the storage database 137 is optimal for failure recovery and provided to the derivation unit 133.

Here, the failure occurrence information filtering unit 131, the failure section determination unit 132, the failure recovery optimal solution derivation unit 133, operation exception processing unit 134, distributed power consideration section load calculation unit 135, load pattern generation The unit 136 and the storage database 137 are components of the central control server 130.

5 is a table showing a fault information filtering process according to the present invention. 6 is a schematic diagram showing a fault information (FI) filtering process according to the present invention. 7 is a schematic diagram showing an interval load calculation and pattern derivation process according to the present invention. 8 is a schematic diagram showing an example of uniformly distributed load modeling according to the present invention. 9 is a schematic view showing a process for deriving an optimal failure recovery plan according to the present invention. 10 is a schematic diagram showing a flowchart of handling exceptions when performing a failure recovery operation according to the present invention.

1) Failure occurrence information (FI) filtering process by distribution automation terminal device (FRTU) (see FIGS. 5 and 6)

The filtering process of the failure occurrence information (FI) in the present invention is as follows. In this process, when the power distribution automation terminal device (FRTU) detects a fault, the operator performs the filtering of FI with the difference in the magnitude of the fault current that is raised to the upper central control unit and the direction of the fault current, thereby increasing the reliability of the fault section determination. It reduces the possibility of errors in the failure section determination.

When the breaker on the fault line transmits "lock-out" information, it searches for the load-side switchgear of the breaker and checks whether "breakdown detection (FI)" information is generated in the switchgear. If there is no FI reception value of the corresponding switch, the FI detection command is retransmitted to receive FI information. When the corresponding opener is " bad communication ", the switch is set to generate the same value as the magnitude and direction of the fault current of the previous switch.

If "Failure Detection (FI)" occurs, the system moves to the FI filtering process to filter out malfunctioning FI through the FI filtering process, and the final FI uses normal FI (Filtered FI: F_FI) information in the load-side switch of the lockout circuit breaker. If it does not occur, the switch is designated as the load-side switch of the fault section, and the power switch of the switch is designated as the power-side switch of the fault section. If normal FI (F_FI) information has been generated (F_FI == TRUE), the routine for determining the failure section is continued by searching for the load-side switchgear of the switchgear. Designate and designate the power supply side switch of the switchgear as the power supply side switch of the failure section.

In the FI filtering process, a normal FI (F_FI) is generated by filtering FI by applying a rule-based reasoning method (see FIG. 5).

As an example, when FI occurs due to an unbalanced ground fault current, a rule may be defined as follows.

if (FI_A == FI_B == FI_C == FALSE) & (FI_N == TRUE) then (F_FI (i) == FALSE)

In addition, the rule in the event of a faulty FI due to voltage fluctuation and unbalanced current in case of a failure can be defined as follows.

if (IF (i-1)> n * IF (i)), then F_FI (i) == FALSE

In addition, the rule can be defined as follows when a faulty FI occurs due to distributed power.

if I_FD (i-1) <> I_FD (i), then F_FI (i) == FALSE

2) Section load processing error due to section load unevenness rate and unconsidered influence of distributed power (see FIGS. 7 and 8)

Section load management in the existing method is calculated by calculating the difference between the inflow current and outflow current of a section composed of a power supply side switch and a load side switch of a section, storing the load data for each hour, and calculating and storing the weekday and weekend maximum values. do. In this way, since the current measurement in the switchgear is not performed at the same time, a large amount of error occurs in the calculation of the section load. Rather, the load load value in the load-side switchgear is greater than the load current in the power-supply switchgear. Error occurs, and in the section where the distributed power supply is connected, it changes to the direction, and the error becomes larger. In addition, because the inequality rate of the section loads is not taken into account, the excessive load is calculated, which is a factor that has many errors when recovering a fault.

The section load calculation process in the present invention is as follows. The field terminal device data processing device periodically measures the current in the field, and the synchronized switch measurement current is stored in the storage DB. The process of calculating the section load by using the switch current measured for a certain period of time (per hour or per 15 minutes) stored in the storage DB, correcting the section load for this, and finally deriving the section load pattern and storing it in the storage DB again Rough.

The acquisition of the section load does not use the existing polling method to measure individual FRTUs one by one, but the process of measuring the load current of individual FRTUs is set by one per FRTU to perform measurements at approximately the same time period and measured through synchronized measurements. Will eliminate the inequality rate. The switch-measured current measured in synchronization is measured at regular time intervals and stored in the storage DB. The section load is calculated using the stored switch measurement current. When a distributed power supply and a load are simultaneously present in the distribution line section, the load amount is calculated in consideration of the current direction of the switch current. In other words, set the direction of the switch current measurement to the inside of the section as (+), set the switch-side switch measurement current as X, the load-side switch measurement current as Y, the distributed power-side switch measurement current as Z, and the switch switch measurement current as If direction is applied, section load is calculated as SL (Section_Load) = X-Y + Z. In order to model an evenly distributed load considering the voltage drop and loss when performing the algae calculation for this load, model 2/3 * SL at the 1/4 position of the section and 1/3 * SL at the end of the section. )

The section load calculated for each period determined in this way is stored in a uniform pattern for each of three types: weekdays, Saturdays, Sundays, and holidays. Before the final calculation of the section load pattern, the section load correction step is performed to prevent distortion of the temporary load such as temporary work, temporary transfer, and holidays. For the calibration, the load pattern curve for each type is compared according to the user's pattern generation cycle to select only the section with a 95% confidence interval, the other sections are discarded, and the data at this time is generated by interpolating the corresponding section data.

Using the corrected section load data, the section load pattern for each type is generated as follows.

For each pattern for each type, the calculation cycle can be set according to the user's requirements. 24-hour pattern using the average value of 2 weeks data is generated for weekdays, and the average value of 4 weeks data is used for Saturdays, Sundays, and holidays. To create a 24-hour pattern.

3) Process for deriving the optimal solution for fault recovery considering distributed power (see Fig. 9)

The process for deriving the optimal failure recovery method in the present invention is as follows. First, to derive candidates for recovery plans, similar to the conventional method, the inner loop, one link line, two link lines, three link lines, one link line and healthy load transfer, two link lines and sound The number of candidates for recovery is calculated by searching for 6 types of recovery, such as the use of load transfer. Through the evaluation of the recovery plan for each candidate, an optimal recovery plan is derived. When deriving the optimal recovery method, detailed tide calculations reflecting the section load and distributed power modeling during the transition of the healthy section are performed to calculate the line load (current) and voltage drop when switching over the linked line for the candidate recovery method. In addition, in the case of a method of using a healthy load transfer after linking among candidates for recovery plans, once connected to the link line, in order to relieve the overload in the link line, a constant open point with the 2nd link line (link line of the link line) is put into the M .Tr. M.Tr. which determines whether loop current is generated according to the load and phase of M.Tr. It is judged whether the loop operation is possible. M.Tr. If a loop operation is possible, the recovery plan is evaluated, the next candidate is transferred, and M.Tr. If the loop operation is impossible, it is processed as no solution and then the next candidate is passed. When all candidate tracks for the recovery plan are evaluated in this way, the evaluation points are compared to derive the optimal recovery plan and end the process for deriving the optimal recovery plan.

4) Process of handling exceptions when performing a failure recovery sequence (see Fig. 10)

In the present invention, an operation-disabled switch search process is added before recovery is derived in order to prevent a failure recovery sequence from being properly executed when a recovery operation is executed. In this process, a list of non-operable actuators that should be excluded when deriving the restoration is generated. This includes a switch in which the following tag is set in the switch. These are the states of control prohibition (control_inhibit), manual control (manual_control), update prohibition (non_update), communication failure (comm_err), gas pressure drop, self-diagnostic error, and battery over-discharge. Among the automatic switches of the faulty line and the linkage line of this line, the above-mentioned switches are searched and added to the list of non-operable switches, so that the switches included in this list are not included in the restoration.

In addition, in the present invention, a processing process for an exception that occurs during a failure recovery operation is added.

When an optimal failure recovery solution is derived for the failure, the solution is performed to perform a failure recovery operation that performs separation of the failure section, recovery of the power side, and switching of the healthy section. When the failure recovery solution was previously derived, the non-operable switch has already been excluded from the operation list, but various exceptions may occur because the field situation does not know how to change, and a process for handling the exception is required. If the failure section separation step in FIG. 10 fails, the fault section should be expanded to the load side or the power supply side depending on whether the load side switchgear of the faulty section is unsuccessful or if the power side switchgear of the faulty section is unsuccessful. Select the lower or upper automatic switch to the power supply side to expand the failure section. Reset and restore the blackout area according to the expanded failure section, and execute the recalculation step again. If the operation fails in the restoration phase of the protection device on the power side, the protection device operated to block the fault is not operated, so select and operate the higher protection device. If there is an unsuccessful open-point operation at the time of transfer to the link line, if there is a next-order recovery solution for restoring the power failure area, recovery is performed using this next-order recovery solution, otherwise, it is determined as non-recoverable and the execution is terminated.

What has been described above is only one embodiment for implementing the automatic fault handling apparatus and method of the distribution system associated with distributed power supply according to the present invention, and the present invention is not limited to the above-described embodiment, and the following patents As claimed in the claims, any person skilled in the art to which the present invention pertains without departing from the gist of the present invention will have the technical spirit of the present invention to the extent that various changes can be made.

Claims (10)

A failure occurrence information filtering unit for filtering and removing error failure occurrence information among failure occurrence information of a distribution line received from a plurality of distribution automation terminal devices;
A failure section determination unit for determining a failure section using the filtered and remaining failure occurrence information;
A failure recovery solution deriving unit for deriving a failure recovery solution for the failure section; And,
Including the operation exception handling unit for handling the operation exception during the failure recovery,
The failure occurrence information filtering unit
When a lockout signal is received from the breaker of the fault line, the load side switchgear of the breaker is searched to check whether the failure occurrence information has occurred from the load side switchgear, and the fault failure occurrence information among the fault occurrence information generated from the load side switchgear is displayed. Automatic failure handling device of the distribution system, characterized by filtering. According to claim 1,
The failure occurrence information filtering unit
Automatic failure handling device of the distribution system characterized in that it uses the magnitude of the fault current and the direction of the fault current transmitted to the upper central control device when detecting the occurrence of the fault in the distribution automation terminal device. According to claim 1,
The failure section determination unit
Using the filtered and remaining fault occurrence information, a load side switchgear of the circuit breaker located at the far end of the switchgear generating fault occurrence information among the load side switchgears of the breaker is designated as a power source side switch of the fault section, and a load side switchgear of the power side switchgear Automatic failure handling device of the distribution system, characterized in that designated as the load-side switchgear in the failure section. According to claim 1,
Automatic load handling system of the distribution system, characterized in that it further comprises a load pattern generating unit for generating a load pattern and a section load calculation unit for calculating the section load reflecting the influence of the section load inequality and distributed power of the distribution line. According to claim 4,
The section load calculation unit
In the field terminal device data processing device to which a plurality of distribution automation terminal devices are connected, the field current of the switch is periodically synchronized and measured, and the synchronized switch measurement current is stored in a storage database,
Calculate and correct the section load by using the switch current measured in synchronization with the cycle stored in the storage database, and store it in the storage database,
The load pattern generator derives the section load pattern and stores it in the storage database. The method of claim 5,
Automatic failure handling device of the distribution system, characterized in that by simultaneously measuring and synchronizing load currents one by one per distribution automation terminal device, and removing the inequality rate through the synchronized measurement. According to claim 1,
Further comprising an algae calculation unit for performing algae calculation,
Automatic failure handling device of the distribution system characterized in that the failure recovery solution derivation unit determines the priority of the link line by using the allowable current and voltage fluctuation values calculated from the tide calculation unit. According to claim 1,
The manipulation exception handling section
Automatic failure handling device of the power distribution system, characterized in that for generating a list of non-operable switchgear, and using the list to generate a failure recovery sequence excluding the non-operable switchgear. The method of claim 8,
The above list
Automatic failure handling device of the power distribution system, characterized in that it is one of a control forbidden switch, a manual control switch, a forbidden switch, a poor communication switch, a gas pressure drop switch, a self-diagnostic error switch, or a battery over-discharge switch. A failure occurrence information filtering step of filtering and removing error failure occurrence information among failure occurrence information of a distribution line received from a plurality of distribution automation terminal devices;
A fault section determination step of determining a fault section using the filtered and remaining fault occurrence information;
A fault recovery solution deriving step of deriving a fault recovery solution for the fault section; And,
Including the operation exception handling step of handling the operation exception during the failure recovery,
The failure occurrence information filtering step,
When a lockout signal is received from the breaker of the fault line, the load side switchgear of the breaker is searched to check whether the failure occurrence information has occurred from the load side switchgear, and the fault failure occurrence information among the fault occurrence information generated from the load side switchgear is displayed. Automatic failure handling method of the distribution system characterized in that the filtering.

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