JP2006304403A - Supervisory controller for distribution system, method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a supervisory controller for a distribution system, a method and a program which can prevent the uncertainty of a dispersion power supply after the system is switched for load interchange and a protection stop to stably interchange electric power among interruption zones, by selecting a load interchange route which minimizes the effects on the dispersion power source on the load interchange side. <P>SOLUTION: Electric amount detectors 601f, 601g arranged in the distribution system detect the electric amount of the current/voltage/effective electric power/ineffective electric power or the like of the dispersion power supplies 6f, 6g. The supervisory controller 3 for the distribution system accommodates dispersion power source equipment data D2 in addition to the distribution system equipment data D1. A dispersion power supply state grasping means 301 grasps the state of the dispersion power supply by obtaining the electric amount measured data of the dispersion power supply. A load interchange route selecting means 302 selects the load interchanging route based on the state of the dispersion power source obtained by the dispersion power source grasping means 301 and the dispersion power source equipment data D2 in addition to the load interchange amount obtained by a load interchanging amount computing means 32 and the dispersion power source equipment data D1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a power distribution system monitoring control apparatus, method, and program for receiving power supply from a host power system and monitoring or controlling a power distribution system interconnected with a plurality of distributed power sources.

  Generally, a power distribution system is configured in a tree shape (radiation shape) and is monitored or controlled by a power distribution system monitoring and control device. Conventionally, power is supplied only from the upper power system to the power distribution system, but in recent years, various distributed power sources such as solar power generation, wind power generation, fuel cells, and micro gas turbines have been introduced. Linkage to has increased.

  However, the conventional power distribution system assumes only power supply from the upper power system, and it has not been assumed that a distributed power source is connected to the system. For this reason, the conventional distribution system monitoring and control device is configured to function as an early power failure restoration at the time of an accident and system switching accompanying system construction based on the switch information captured from the distribution system. No consideration was given to distributed power sources.

  FIG. 11 is a diagram showing a configuration example in the case where monitoring control of the distribution system is performed by such a conventional distribution system monitoring control device. As shown in FIG. 11, the distribution system is composed of a distribution substation 1 and a plurality of distribution lines 2, and the distribution system monitoring control device 3 is a remote monitoring control installed in the distribution substation 1. Monitoring and control of the distribution line 2 is performed through the device 4 and the communication line 5.

  Here, the power distribution system monitoring control device 3 includes a monitoring control computer 30A having a storage unit A1 and a calculation / communication unit B1, and a display operation device 30B. The storage unit A1 of the monitoring control computer 30A stores distribution system facility data D1 related to the distribution system facility. The calculation / communication unit B1 of the supervisory control computer 30 includes system state monitoring means 31, load accommodation utilization calculation means 32, load accommodation route selection means 33, and switch operation command output means 34.

  On the other hand, in the distribution substation 1 of the distribution system, there are a distribution transformer 11 for converting the supply voltage from the upper power system into a distribution voltage, and a three-phase circuit connected to the distribution transformer 11 via a circuit breaker 12. A plurality of circuit breakers 14 for connecting the bus 13, the three-phase bus 13 and the plurality of distribution lines 2 are provided. In addition, in many cases, the distribution line 2 actually exists in many cases, but in FIG. 11, only the distribution lines 2a to 2c are shown from the viewpoint of simplification, and accordingly, the plurality of circuit breakers 14 are also Only the corresponding circuit breakers 14a-14c are shown.

  The plurality of distribution lines 2 are connected in a dendritic shape to form a distribution network, and each distribution line 2 has a plurality of switches as switching means for dividing the distribution lines and defining the distribution section. SW is installed, and between each two distribution lines 2, switch SW which connects between the distribution lines is installed. That is, as switches for distribution line classification, five switches SWa1 to SWa5 are provided on the distribution line 2a, four switches SWb1 to SWb5 are provided on the distribution line 2b, and four switches SWc1 to SWc4 are provided on the distribution line 2c. is set up. Moreover, as a switch for interconnection of distribution lines, a switch SWab is installed between the distribution lines 2a-2b, a switch SWbc is installed between the distribution lines 2b-2c, and a switch SWca is installed between the distribution lines 2c-2a. ing.

  Here, the distribution line classifying switches SWa to SWc are always operated in the “closed state”, and the distribution line interconnection switches SWab to SWca are always operated in the “open state”. The switches SW installed in the distribution line 2 are connected to the slave station devices ST that operate the switches. That is, the slave station devices STa1 to STa5, STb1 to STb5, STc1 to STc4 are connected to the switches SWa1 to SWa5, SWb1 to SWb5, SWc1 to SWc4 for distribution line classification, respectively, and the switch SWab for distribution line interconnection is connected. The slave station devices STab to STca are connected to .about.SWca, respectively.

  On / off of each switch SW is remotely controlled by the distribution system monitoring and control device 3 through these slave station devices ST. Of these slave station devices ST, each of the slave station devices STa to STc of the distribution line classification switches SWa to SWc that are always operated in the “closed state” is other than the data transmission / reception function for remote control. In addition, when each of the distribution lines 2a to 2c is charged, it has a function of turning on after a certain period of time “X time period” and a function of locking automatic turning on when a power failure occurs again within a certain time “Y time period” after turning on. With this function, when an accident occurs in the power distribution system, the accident occurrence section can be specified.

  In the distribution section between the switches SWa4 and SWa5 in the distribution line 2a and the distribution section between the switches SWc2 and SWc3 in the distribution line 2c, the distributed power supply is provided via the switches 8f and 8g that are always operated in the “closed state”. 6f and 6g are interconnected, and are connected to the in-house loads 7f and 7g.

  The remote monitoring control device 4 and the slave station device ST communicate with each other by a polling method. The remote monitoring control device 4 sequentially polls the slave station device ST in the same communication line by polling, and the state If there is a change, the status is transmitted to the monitoring control computer 30A of the distribution system monitoring control device 3.

  Normally, since the slave station device ST secures drive power from the distribution system, if a power failure occurs in the distribution system, the remote monitoring control device 4 and its slave station device ST cannot communicate (this state is “child” Called “station unresponsive”.) In this case, the remote monitoring control device 4 notifies the distribution system monitoring control device 3 that the slave station device ST is in the “no response state”.

  In the configuration of FIG. 11 as described above, for example, when a distribution line accident (accident point P in FIG. 11) occurs in the distribution line 2a, the circuit breaker 14a in the distribution substation 1 is interrupted and the distribution line 2a is disconnected. The switches SWa1 to SWa5 that are always in the “closed state” constituting the electric wire 2a are changed from the “closed state” to the “no-voltage open state”, and the distribution line 2a is changed to the “power failure state”. At this time, the protection such as the voltage drop relay works, so that the normally closed switch 8f that connects the distribution line 2a and the distributed power source 6f becomes the “off state”, and the dispersion is disconnected from the distribution system. The power source 6f and the in-house load 7f shift to a self-sustaining operation.

  When a certain time elapses after the circuit breaker 14a is interrupted, the circuit breaker 14a is turned on, and the switches SWa1 to SWa5 of the distribution line 2a are sequentially turned on from SWa1. When the distribution line accident continues, when the switch SWa2 constituting one end of the distribution section at the accident point P is turned on, the fault current flows again, so that the circuit breaker 14a is interrupted again, and the distribution line 2a is again “Power failure”.

  Thus, when an accident current flows when the switch SWa2 is turned on, the accident continues in the power distribution section between the turned-on switch SWa2 and the next switch SWa3. In this case, even if the circuit breaker 5a is turned on and the switch SWa1 is set to the “ON state”, the subsequent switches SWa2 and SWa3 remain open, and the distribution section between the switches SWa3 to SWa5 where no accident has occurred is Since it will be in a power failure state, electric power is interchanged from the other distribution lines 2b or 2c in this distribution section.

  As described above, when it is necessary to interchange power from other distribution lines, in the distribution system monitoring and control device 3, first, each distribution line obtained from the distribution system facility data D1 by the load accommodation amount calculation means 32 is used. From the capacity and contract load information for each section of the distribution line, and the distribution current of the distribution line, the reserve capacity and load accommodation amount of each distribution line are calculated. Subsequently, the load accommodation route selection means 33 selects a load accommodation route that can supply power to the power outage section (section between the switches SWa3 to SWa5) of the distribution line 2a.

  Next, a “command to turn on a normally open switch” necessary for supplying power through the determined load accommodation route is sent from the switch operation command output means 34 to the remote monitoring control device 4. The remote monitoring control device 4 sends a “signal for turning on the normally open switch” to the corresponding slave station device ST in accordance with the received command. The slave station device ST turns on the switch SW to be operated according to the signal.

For example, in FIG. 11, when the distribution line 2b has a sufficient reserve, the switch SWab linked between the distribution lines 2a-2b becomes a load accommodation route, the switch SWab is turned on, and the switch SWa3 -Supply power to the section between SWa5. Or when there is sufficient reserve power in the distribution line 2c, the switch SWca connecting the distribution lines 2c-2a is turned on to supply power to the section between the switches SWa3-SWa5. Restore all sections except the section where the accident occurred.
JP 2003-189472 A

  As described above, in the conventional power distribution system, it was not assumed that the distributed power supply is connected to the system. Therefore, in the conventional power distribution system monitoring and control device, the power distribution system is not considered without considering the distributed power supply. Supervisory control was being processed. However, in recent years, distributed power sources have been linked to the power distribution system, and a plurality of distributed power sources have often been linked to a single power distribution system. The following problems may occur.

  In other words, when an accident occurs in a distribution line and power is interchanged from another distribution line to a power outage section, the conventional distribution system monitoring and control device measures the distribution current of the distribution line and further outputs the output current of the distributed power source. Etc., the distribution line load is obtained from the total, and the load accommodation amount necessary for the power outage section is calculated. And the load accommodation route which can supply electric power to the load of a power failure area will be selected by comparing the obtained load accommodation amount with the reserve capacity of each distribution line.

  In such a method, when a distributed power source is connected to the load accommodation route, the distributed power source itself may become unstable after system switching due to disturbance caused by turning on the interconnection switch for load accommodation. Moreover, since protection coordination is not taken, there is a possibility that problems such as protection stop may occur.

  The present invention has been proposed to solve the above-described problems of the prior art, and its purpose is to select a load accommodation route that minimizes the influence on the distributed power source on the load accommodation side. An object is to provide a distribution system monitoring control device, method, and program capable of preventing distributed power supply instability and protection stop after system switching for load accommodation, and stably accommodating power to a power outage section.

  In order to achieve the above object, the present invention minimizes the influence on the distributed power source on the load accommodation side by grasping the state of the distributed power source based on the amount of electricity of the distributed power source and selecting the load accommodation route. The load accommodation route can be selected.

  The power distribution system monitoring and control device of the present invention is a power distribution system monitoring and control device that receives power supply from a higher power system and monitors or controls a power distribution system linked to a plurality of distributed power sources. It is characterized by comprising a calculation means, a distributed power state grasping means, and a load accommodation route selection means. Here, the system state monitoring means is means for monitoring the state of the distribution system. The load accommodation amount calculation means is a means for calculating a power outage section in the power distribution system and a load accommodation amount for the power outage section based on the distribution system equipment data relating to the state of the power distribution system and the equipment of the power distribution system. The distributed power supply state grasping means is means for grasping the state of the distributed power supply based on the amount of electricity of the distributed power supply. The load accommodation route selection means is a load accommodation route that performs load accommodation of the load accommodation amount in the distribution system based on the state of the distributed power source, the load accommodation amount, the distributed power facility data on the facility of the distributed power source, and the distribution system facility data. It is a means to select.

  Further, the distribution system monitoring control method and the distribution system monitoring control program of the present invention grasp the characteristics of the distribution system monitoring control device from the viewpoints of the method and the computer program.

  According to the present invention as described above, by determining the state of the distributed power supply before and after the accident based on the amount of electricity of the distributed power supply, when selecting a load accommodation route, depending on the state of the distributed power supply, the load accommodation side The impact on the distributed power supply can be accurately evaluated. In addition to the state of the distributed power supply, the influence on the distributed power supply can be more accurately evaluated by using the distributed power supply facility data. Therefore, it is possible to select a load accommodation route that minimizes the influence on the distributed power supply on the load accommodation side.

  According to the present invention, the load accommodation route that minimizes the influence on the distributed power source on the load accommodation side can be selected by grasping the state of the distributed power source based on the amount of electricity of the distributed power source and selecting the load accommodation route. Therefore, it is possible to provide a distribution system monitoring and control device, method, and program capable of preventing the distributed power supply instability and the protection stop after the system switching for load accommodation, and stably accommodating power to the power failure section.

  Hereinafter, embodiments to which the present invention is applied will be described in detail with reference to the drawings. From the viewpoint of simplifying the explanation, the same components are denoted by the same reference numerals throughout the drawings.

[1. First Embodiment]
[1-1. Constitution]
FIG. 1 is a diagram showing a configuration of a distribution system monitoring and control apparatus according to a first embodiment to which the present invention is applied. As shown in FIG. 1, the distribution system of the present embodiment has the same configuration as the distribution system shown in FIG. 11, and each interconnection of the distributed power source 6f and the on-site load 7f and the distributed power source 6g and the on-site load 7g. On the other hand, there are installed electric quantity detection devices 601f and 601g for detecting electric quantity such as current, voltage, active power, reactive power and the like of the distributed power sources 6f and 6g. These electric quantity detection devices 601f and 601g are connected to data transmission devices 602f and 602g for sending the measured electric quantity measurement data of the distributed power source to the remote monitoring control device 4, respectively.

  Further, in the configuration of the conventional power distribution system monitoring control apparatus shown in FIG. 11, the power distribution system monitoring control apparatus 3 of the present embodiment is distributed in the storage unit A1 of the monitoring control computer 30A in addition to the power distribution system facility data D1. Distributed power supply status data grasps the status of the distributed power supplies 6f and 6g by storing the distributed power supply equipment data D2 related to the power supplies 6f and 6g and acquiring the electric quantity measurement data of the distributed power supplies 6f and 6g in the calculation / communication unit A2. Means 301 is added.

  In addition to the load accommodation amount obtained from the load accommodation amount calculation unit 32 and the distribution system facility data D1 obtained from the storage unit A1, the load accommodation route selection unit 302 according to this embodiment includes the distributed power state grasping unit 301. By using the state of the distributed power sources 6f and 6g and the distributed power facility data D2, the load accommodation route is selected by a method different from the conventional load accommodation route selection means 33.

  FIG. 2 is a diagram illustrating an example of the configuration of the distributed power supply state grasping unit 301. As shown in FIG. 2, the distributed power state grasping unit 301 includes a measurement data matching check unit 3011, a measurement data temporal change check unit 3012, and a distributed power state determination unit 3013.

  Here, the measurement data matching check unit 3011 checks the temporal matching between the electrical quantity measurement data of the distributed power supplies 6f and 6g, and the measurement data temporal change check unit 3012 is the electrical quantity measurement data that is temporally matched. Check for changes over time. The distributed power supply state determination unit 3013 determines whether or not the distributed power supplies 6f and 6g are disconnected from the distribution system due to an accident based on the check result of the temporal change.

  FIG. 3 is a diagram illustrating an example of the configuration of the load accommodation route selection unit 302. As shown in FIG. 3, the load accommodation route selection means 302 includes a load accommodation amount correction calculation unit 3021, a load accommodation route candidate extraction unit 3022, a distributed power source influence calculation unit 3023, a load accommodation route determination unit 3024, and a switch operation. It consists of a procedure creation unit 3025.

  Here, the load accommodation amount correction calculation unit 3021 corrects the load accommodation amount according to the state of the distributed power source based on the state of the distributed power source, the load accommodation amount, and the distributed power source facility data D2, and the corrected load accommodation. Get quantity. Based on the distribution system facility data D1, the load accommodation route candidate extraction unit 3022 extracts load accommodation route candidates that perform load accommodation of the corrected load accommodation amount in the distribution system. The distributed power source influence calculation unit 3023 calculates the degree of influence on the distributed power source at the time of system switching for load accommodation based on the state of the distributed power source and the distributed power facility data D2. The load accommodation route determination unit 3024 uses the priority order determined based on the number of switches to be operated at the time of system switching and the degree of influence on the distributed power source, and determines the priority order from among the load accommodation route candidates. A high candidate is determined as a load accommodation route. The switch operating procedure creating unit 3025 creates a switch operating procedure for performing load accommodation with the determined load accommodation route. FIG. 4 is a diagram illustrating an example of the distributed power supply facility data D2.

  In the power distribution system monitoring and control apparatus 3 as described above, the monitoring control computer 30A is realized by a computer and its control software. That is, the storage unit A1 is realized by various memories of the computer, an auxiliary storage device, and the like. The calculation / communication unit A2 is a part having both functions of a calculation unit that performs data processing calculation and a communication unit that performs communication of processed data and data used for processing. Specifically, the arithmetic / communication unit A2 includes a computer main memory and a program specialized for power distribution system monitoring control stored therein, a CPU controlled by the program, a communication modem, and the like. It is realized by.

  The display operation device 30B is a man-machine interface device realized by an input device such as a mouse and a keyboard generally connected to a computer, a display device such as a display, and output software.

[1-2. Action]
The operation of the distribution system monitoring and control device 3 having the above configuration is as follows. In FIG. 1, the electric current detection devices 601f and 601g installed at the interconnection points of the distributed power source 6f and the on-site load 7f and the distributed power source 6g and the on-site load 7g respectively provide the current / voltage / effectiveness of the distributed power sources 6f and 6g When the amount of electricity such as electric power and reactive power is detected, the measured electricity amount measurement data is sent to the remote monitoring control device 4 by the data transmission devices 602f and 602g. The remote monitoring control device 4 sends the electric quantity measurement data of the distributed power supplies 6f and 6g to the monitoring control computer 30A of the distribution system monitoring control device 3.

  For example, when an accident occurs at the fault point P of the distribution line 2a, an accident current flows, the circuit breaker 14a is cut off, the distribution system 2a enters a non-voltage state, and the switches SWa1 to SWa5 are opened without voltage. . In this case, since the switch 8f connecting the distribution line 2a and the distributed power source 6f is opened due to the voltage drop protection, the distributed power source 6f and the in-house load 7f shift to the self-sustaining operation state.

  After a certain time, when the circuit breaker 14a is turned on and charged to the switch SWa1 of the distribution line 2a, the switch SWa1 is turned on. Subsequently, the switch SWa2 is charged and turned on, but when the accident continues, the accident current flows again and the circuit breaker 14a is opened. After a certain period of time, the circuit breaker 5a is turned on again, and is sequentially turned on from the switch SWa1 of the distribution line 2a. However, the switches SWa2 and SWa3 are turned on and the section below the switch SWa3 is closed. A power failure occurs.

  In this case, in order to supply power to the power outage section excluding the accident section, the distribution system monitoring and control device 3 operates as follows. That is, first, the system state monitoring unit 31 sends the state of the distribution system before the accident to the load accommodation amount calculating unit 32. The load accommodation amount calculation means 32 calculates the distribution line sending current value before and after the accident, the distribution section kw and the distribution ratio from the distribution section kw, calculates the section load from the distribution line distribution ratio, The section load is the load accommodation amount. That is, the presence / absence of a distributed power source is not considered in such a load accommodation amount calculation stage. The load accommodation amount calculation result obtained by the load accommodation amount calculation means 32 is sent to the load accommodation route means 302.

  On the other hand, the distributed power state grasping means 32 receives the electrical quantity measurement data at the distributed power supply terminal from the remote monitoring control device 21 and processes the received electrical quantity measurement data as follows.

  First, the measurement data matching check unit 3011 checks the temporal matching between the electrical quantity measurement data from the measurement time data added to the electrical quantity measurement data, and the matched electrical quantity measurement data is measured as the measurement data time. To the change check unit 3012. A measurement data temporal change check unit 3012 checks a temporal change in measurement data from before the accident to after the accident, for example, a change in output active power or a change in voltage of the distributed power source, and the result is a distributed power state determination unit. Send to 3013.

  The distributed power supply state discriminating unit 3013 is a state where the distributed power supply is disconnected due to an accident from the state where the distributed power supply is connected to the distribution system based on the check result of the temporal change from the measurement data temporal change check unit 3012 Or whether the vehicle has been stopped before the accident, whether it has been started, or has been stopped. For example, if there is almost no temporal change in the output of the distributed power supply before and after the accident, the distributed power supply is not connected to the distributed power supply of the accident distribution line, but is connected to a remote location and is in a steady operation state after the accident. to decide. When the output of the distributed power supply is “0” after the accident, it is determined that the distributed power supply is disconnected from the power distribution system after the accident. The status determination result of each distributed power source is sent to the load accommodation route selection means 302.

  The load accommodation route selection unit 302 uses the distributed power source state determination result obtained from the distributed power source state grasping unit 301 to select a load accommodation route that minimizes the influence on the distributed power source as follows. Perform proper processing.

  First, the load accommodation amount correction calculation unit 3021 considers the state of the distributed power source based on the state determination result of the distributed power source, the load accommodation amount calculated by the load accommodation amount calculation means 32, and the distributed power facility data D2. Calculate the load capacity to the power outage section.

  In the method, for example, when the load accommodation amount Po calculated by the load accommodation amount calculation means 32 is obtained from the difference between the distribution line sending currents before and after the accident, the distributed power source is supplied to the distribution system before the accident. It is calculated as follows depending on whether or not power is supplied.

In other words, if the distributed power supply is supplying power to the distribution system before the accident (reverse power flow), if the distributed power supply is disconnected after the accident, the reverse power flow Pg is added to Po to create a new load. The accommodation amount Po ′ is obtained by the following equation (1) and sent to the load accommodation route candidate extraction unit 3022.
Po '= Po + Pg (1)

If it is not reverse power flow, the in-house load amount PL is calculated by referring to the active power Pg at the distributed power grid connection point before the accident, the planned operation output value of the distributed power facility data 34, and the in-house load plan value. Find Po ′ by equation (2). When the in-house load amount can be directly measured, the calculation result accuracy of equation (2) is improved.
Po '= Po + PL (2)

  If the distributed power source is not connected to the distribution line before and after the accident, the load accommodation amount correction calculation unit 3021 calculates the load accommodation amount calculation means 32 without performing the correction calculation. The load accommodation amount Po is sent to the load accommodation route candidate extraction unit 3022 as it is (Po ′ = Po).

The load accommodation route candidate extraction unit 3022 extracts distribution line and power supply route (load accommodation route) candidates that have a margin enough to cover the load accommodation amount Po ′ based on the distribution system facility data D1. For example, in the distribution system of FIG. 1, when the transmission power after the accident of the distribution lines 2b and 2c is P2b and P2c and the distribution line capacities are C6b and C6c, respectively, When the formula 4) holds, the distribution line 2b is extracted as a load accommodation route candidate.
C2b-P2b> Po '(3)
C2c-P2c <Po '(4)

  In addition, since an actual power distribution system is composed of a large number of distribution lines, the number of load accommodation route candidates that are actually extracted is rarely single, and a plurality of load accommodation route candidates are generally extracted. The plurality of load accommodation route candidates extracted by the load accommodation route candidate extraction unit 3022 are sent to the load accommodation route determination unit 3024.

  On the other hand, the distributed power influence calculation unit 3023 determines the degree of influence on each distributed power supply at the time of system switching for load accommodation from the distributed power supply status determination result obtained from the distributed power supply status grasping unit 301 and the distributed power supply facility data D2. Is calculated. For example, the more the "output of the distributed power source is closer to 100% of the rated output", the "the higher the rated output" is, the more "the connection point of the distributed power source is closer to the system switching switch" The degree is thought to increase. The calculation formula for the influence degree is an expression in which these items that influence the influence degree are normalized by a value of 0 to 1, multiplied by a weighting coefficient, and added. For example, the influence degree can be obtained by the following equation (5).

E = w1, A1 + w2, A2 + w3, A3 (5)
here,
E: Frequency of influence A1: Operating output ratio of distributed power supply (= Operating output / rated output, 0 ≦ A1 ≦ 1)
w1: A1 weighting factor (0 ≦ w1 ≦ 1)
A2: Distributed power supply rated output (= rated output / distributed power supply maximum rated output in the distribution system, 0≤A2≤1)
w2: A2 weighting factor (0≤w2≤1)
A3: Electrical distance from the target system switching switch (= impedance from the switch to the shortest connection point / impedance from the switch to the target connection point, 0 ≦ A3 ≦ 1)
w3: A3 weighting factor (0≤w3≤1)

  The degree of influence on each distributed power source calculated by the distributed power source influence calculating unit 3023 is sent to the load accommodation route determining unit 3024.

  For each load accommodation route candidate, the load accommodation route determination unit 3024 calculates each load accommodation from the total operation number N of the switches operated at the time of system switching for performing load accommodation in the load accommodation route and the influence degree E of the distributed power source. Determine the priority of route candidates. For example, the priority of each candidate can be obtained by the following equation (6).

Pr = a1 / N + a2 / E (6)
here,
Pr: Priority level a1: Weighting factor for total operation number N of system switching switches a2: Weighting factor for distributed power source influence frequency E

  In this equation (6), the greater the N (the greater the total number of switch operations), the smaller the priority number the greater E (the greater the influence of the distributed power supply). The priority order is determined by obtaining the priority number “Pr” for each load accommodation route candidate and arranging them in descending order of numerical values. The load accommodation route determination unit 3024 confirms whether or not the candidates can be executed in order from the load accommodation route candidates with the higher priority determined in this way, and determines the load accommodation route.

  The data of the load accommodation route finally determined by the load accommodation route determination unit 3024 is sent to the switch operation procedure creation unit 3025. The switch operating procedure creating unit 3025 creates a switch operating procedure necessary for performing system switching on the load accommodation route, and sends it to the switch operating signal output means 34.

  The switch operation signal output means 34 sends a control command for the target switch SW to the remote monitoring control device 4.

  The remote monitoring control device 4 sends an operation command to turn on or off the switch SW to the slave station device ST that operates the target switch SW, and the slave station device opens or closes the switch according to the operation command. The operation of turning on or off the device SW is executed.

  The above-described evaluation formulas (1) to (6) are examples of an evaluation formula for selecting a load accommodation route, and various other evaluation formulas can be considered.

[1-3. effect]
As described above, according to the present embodiment, the influence on the distributed power source on the load accommodation side is determined by grasping the state of the distributed power source before and after the occurrence of the accident based on the amount of electricity of the distributed power source and selecting the load accommodation route. Since the load accommodation route with the minimum degree can be selected, it is possible to prevent distributed power source instability and protection stop at the time of system switching for load accommodation, and to stably power supply to the power failure section.

[1-4. Modification of load accommodation route selection means]
5 to 8 show, as modifications of the load accommodation route selection unit 302 (FIG. 3) of the distribution system monitoring and control device according to the first embodiment, load accommodation route selection units 302A to 302D having different configurations. FIG. Hereinafter, these modified examples will be sequentially described.

  A load accommodation route selection unit 302A shown in FIG. 5 is a distributed power source interconnection presence / absence determination unit instead of the distributed power source influence calculation unit 3023 in the configuration of the load accommodation route selection unit 302 (FIG. 3) according to the first embodiment. 3026 is provided, and the configuration of other parts is the same as that in FIG. The operation of the load accommodation route selection means 302A shown in FIG. 5 is as follows.

  In the load accommodation route selection unit 302A of FIG. 5, the distributed power source interconnection presence / absence determining unit 3026 extracts the distributed power source interconnection information from the distributed power source facility data D2, and compares it with the information from the distributed power source state grasping unit 301. Determines whether the distributed power supply is connected or not. When the distributed power supply is connected, the signal “1” is displayed. When the distributed power supply is not connected, the signal “0” is displayed. The distribution line number to which the distributed power supply is connected. The route number is sent to the load accommodation route determination unit 3024 together with the linked section number.

  The load accommodation route determination unit 3024 preferentially selects load accommodation route candidates that are not linked to the distributed power source on the route from among the load accommodation route candidates based on the signal from the distributed power source interconnection presence / absence determination unit 3026. . For example, when there is a distributed power source on the route of the load accommodation route candidate, the signal “1” is obtained. Therefore, by adding them for each load accommodation route candidate and arranging the values in a small order, the distributed power source is obtained. It is possible to select a load accommodation route candidate with the least number of interconnections and determine it as a load accommodation route.

  The other operation of the load accommodation route selection unit 302A is the same as that of the load accommodation route selection unit 302 in FIG.

  According to such load accommodation route selection means 302A, it is possible to efficiently select a load accommodation route with the least number of interconnected distributed power sources. Therefore, it is possible to accurately select a load accommodation route that minimizes the influence on the distributed power source on the load accommodation side.

  The load accommodation route selection unit 302B illustrated in FIG. 6 includes a distributed power source type determination unit 3027 instead of the distributed power source influence calculation unit 3023 in the configuration of the load accommodation route selection unit 302 (FIG. 3) according to the first embodiment. The configuration of other parts is the same as that of FIG. The operation of the load accommodation route selection means 302B shown in FIG. 6 is as follows.

In the load accommodation route selection means 302B of FIG. 6, the distributed power supply type discriminating unit 3027 extracts the type of the distributed power supply, the output stability point A, and the transient stability point B from the distributed power supply facility data D2, and these points A, From B, the overall evaluation point T is obtained by the following equation (7), and the obtained overall evaluation point T is sent to the load accommodation route determination unit 3024.
T = wa · A + wb · B (7)
Wa: A weighting factor, wb: B weighting factor

  Here, the output stability of a distributed power source is obtained by converting renewable energy (wind power, sunlight, etc.) to obtain power energy, and measures for stabilizing the output (such as the installation of power storage devices) are implemented. An undistributed distributed power source is set as output stability (low), and a fuel-supply type distributed power source (fuel cell, synchronous generator, etc.) such as natural gas is set as output stability (high). The level of output stability is expressed by normalized real number points from “0” (low) to “1” (high).

  In addition, the transient stability of the distributed power supply is determined from the response when the load is reduced to 50% during a 100% load operation by simulation in advance. The stability is expressed by normalized real points from “0” (low) to “1” (high). Such points of output stability and transient stability are registered in advance in the distributed power supply facility data D2.

  The load accommodation route determination unit 3024 preferentially selects a load accommodation route candidate to which a distributed power source having a large overall evaluation point T is linked, based on the overall evaluation point T calculated by Expression (7). For example, by adding the total evaluation points of distributed power sources that exist on the route of the load accommodation route candidate and arranging the values in a large order, the load accommodation route candidate with the highest stability of the distributed power source with respect to the operation of the switch can be obtained. You can select and determine the load accommodation route.

  The other operation of the load accommodation route selection unit 302B is the same as that of the load accommodation route selection unit 302 in FIG.

  According to such load accommodation route selection means 302B, it is possible to select the load accommodation route with the highest stability of the distributed power source with respect to the operation of the switch. Therefore, it is possible to accurately select a load accommodation route that minimizes the influence on the distributed power source on the load accommodation side.

  The load accommodation route selection unit 302C shown in FIG. 7 is a distributed power source operating state determination unit 3028 instead of the distributed power source influence calculation unit 3023 in the configuration of the load accommodation route selection unit 302 (FIG. 3) according to the first embodiment. The structure of other parts is the same as that of FIG. The operation of the load accommodation route selection means 302C shown in FIG. 7 is as follows.

  In the load accommodation route selection unit 302C of FIG. 7, the distributed power supply operation state determination unit 3028 extracts the operation plan value (operation output, operation power factor, load power, load power factor) of the distributed power supply from the distributed power supply facility data D2. Then, it collates with the electric quantity information of the distributed power source obtained from the distributed power source state grasping means 301. The distributed power supply operation state discriminating unit 3028 determines the operation state of the distributed power supply according to the collation result as follows: (1) Operating (constant output state), (2) Starting (output increasing state), (3) Stopping (Output falling state), (4) Stopped state (Output 0 state), the output power state (%) at that time (= output power (kW) / rated output (kW) × 100), the load The influence on the distributed power supply due to the operation of a switch for accommodation is expressed by an integer from “0” to “3” (0: no influence, 1: small influence, 2: medium influence, 3: large influence).

  The distributed power supply operating state discriminating unit 3028 shows the operating state and the influence degree thus obtained together with the distribution line number and the section number with which the distributed power source is linked, and the load accommodation route determining unit. Send to 3024.

  The load accommodation route determination unit 3024 preferentially selects a load accommodation route candidate that has the least influence on the distributed power source by a switch operation or the like on the route of the load accommodation route candidate. For example, by weighting and adding all the influences of distributed power sources on the route of load accommodation route candidates, and arranging the load accommodation route candidates in the order of the smallest value, the load accommodation route candidates having the least influence of the distributed power source can be obtained. You can select and determine the load accommodation route.

  In addition, when the weighted addition value of the load accommodation route candidate is larger than a certain value, or when the distributed power source having the influence level “3” is on the route, the load accommodation route candidate is excluded in advance. This makes it possible to reliably exclude candidates for load accommodation including high-impact candidates and high-impact distributed power sources.

  The other operation of the load accommodation route selection unit 302C is the same as the operation of the load accommodation route selection unit 302 in FIG.

  According to such load accommodation route selection means 302C, it is possible to select a load accommodation route that has the least influence on the distributed power source with respect to the operation of the switch. Therefore, it is possible to accurately select a load accommodation route that minimizes the influence on the distributed power source on the load accommodation side.

  The load accommodation route selection unit 302D shown in FIG. 8 is different from the distributed power source influence calculation unit 3023 in the configuration of the load accommodation route selection unit 302 (FIG. 3) according to the first embodiment. 3027 and the distributed power supply operating state determination unit 3028 of FIG. 7 are provided, and the configuration of other parts is the same as that of FIG. The operation of the load accommodation route selection means 302D shown in FIG. 8 is as follows.

  In the load accommodation route selection means 302D of FIG. 8, the data processing by the distributed power supply type determination unit 3027 and the distributed power supply operation state determination unit 3028 is as described above with respect to the load accommodation route selection means 302B and 302C of FIGS. is there.

  In the load accommodation route selection unit 302D of FIG. 8, the load accommodation route determination unit 3024 acquires the processing results from both the distributed power supply type determination unit 3027 and the distributed power supply operation state determination unit 3028, and based on the processing results, The total evaluation points of the distributed power sources existing on the route of the load accommodation route candidate are added, and the influence coefficients “0” to “3” of the distributed power sources existing on the route are weighted and added. By selecting a load accommodation route candidate with a large overall evaluation point value and a small weighted addition value, the load that has a small impact on the distributed power source and a high stability of the distributed power source with respect to the operation of the switch An accommodation route candidate can be selected and determined as a load accommodation route.

  The other operation of the load accommodation route selection unit 302D is the same as that of the load accommodation route selection unit 302 in FIG.

  According to such load accommodation route selection means 302D, it is possible to select a load accommodation route with high stability of the distributed power source with respect to the operation of the switch and small influence on the distributed power source with respect to the operation of the switch. That is, since the effects of both the load accommodation route selection means 302B and 302C of FIGS. 6 and 7 can be obtained, it is possible to more accurately select the load accommodation route that minimizes the degree of influence on the distributed power source on the load accommodation side. it can.

[2. Second Embodiment]
FIG. 9 is a diagram showing a configuration of a distribution system monitoring and control apparatus according to the second embodiment to which the present invention is applied. As shown in FIG. 9, in the present embodiment, distributed power source external control devices 603f and 603g for controlling the distributed power sources 6f and 6g are added to the power distribution system shown in FIG. A power supply control command unit 303 is added, and the distributed power supply control command unit 303 and the distributed power supply external control devices 603f and 603g are connected by a high-speed signal transmission path 604. The configuration of other parts is the same as that of the first embodiment.

  In the present embodiment, the distributed power control command unit 303 extracts information on the distributed power source connected on the load accommodation route selected by the load accommodation route selection unit 302 from the distributed power facility data D2, and at the time of load accommodation. In order to minimize the influence of the switch operation of the power generator and to enable stable operation, a command to reduce the generated output power, a command to switch the generator excitation control system, etc. are controlled via the high-speed signal transmission line 604. Send to devices 603f and 603g. The distributed power supplies 6f and 6g are operated according to this control command. In addition, the other effect | action of the power distribution system monitoring control apparatus 3 is the same as that of 1st Embodiment.

  According to this embodiment, in addition to the effects of the first embodiment, the following effects can be obtained. That is, a control command for minimizing the influence of the switch operation on the distributed power source can be sent to the distributed power source, and the operating state of the distributed power source can be temporarily changed. Therefore, since the influence on the distributed power supply can be reduced, the distributed power supply instability and protection stoppage at the time of switching the system for load accommodation can be more actively prevented, and power can be more stably accommodated in the power outage section. be able to.

  Also in this embodiment, as in the first embodiment, the load accommodation route selection means 302A to 302D in FIGS. 5 to 8 can be used instead of the load accommodation route selection means 302 in FIG. The same effect can be obtained.

[3. Third Embodiment]
FIG. 10 is a diagram showing a configuration of a program according to the third embodiment to which the present invention is applied. In FIG. 10, a program 90 is for causing a computer to act as the distribution system monitoring and control device 3 of FIGS. 1 and 9, and a system state monitoring process 901, a load capacity calculation process 902, and a distributed power supply state grasping. A process 903, a load accommodation route selection process 904, a branch process 905, a distributed power supply control command process 906, a switch operation signal output process 907, and necessary data are configured.

  Here, the system state monitoring process 901 and the load accommodation amount calculation process 902 are the program codes of the operations of the system state monitoring unit 31 and the load accommodation amount calculation unit 32 as described in the related art. In addition, the distributed power supply state grasping process 903, the load accommodation route selection process 904, the distributed power supply control command process 906, and the switch operation signal output process 907 are the distributed power supply state as described in the first and second embodiments. The actions of the grasping means 301, the load accommodation route selecting means 302, the distributed power supply control command means 303, and the switch operation output means 34 are respectively program coded. The branch process 905 is a process for branching the processes of the second embodiment including the distributed power control command unit 303 and the first embodiment not including the distributed power control command unit 303.

  The program 90 is recorded on a recording medium such as a CD-ROM 91, for example. As the recording medium, all the media that can record electronic information, such as a flexible disk, MO, hard disk, magnetic tape, flash memory, and the like are targeted. The program 90 may also be provided to the application computer through a network.

  According to this embodiment, by providing a program to a general-purpose computer, the computer can be operated in the same manner as the power distribution system monitoring and control device according to the first and second embodiments, and the same effect can be obtained. Can be obtained.

[4. Other Embodiments]
The present invention is not limited to the above-described embodiments and modifications, and various other modifications can be implemented within the scope of the present invention. For example, the above-described modified examples can be appropriately combined. Furthermore, the configuration and processing contents of the power distribution system monitoring and control apparatus shown in the above embodiment are merely examples, and as long as the load accommodation route is selected by grasping the state of the distributed power source based on the amount of electricity of the distributed power source. The general apparatus configuration and processing contents can be freely changed.

The figure which shows the structure of the power distribution system monitoring control apparatus which concerns on 1st Embodiment to which this invention is applied. The figure which shows an example of a structure of the distributed power supply state grasping | ascertainment means shown in FIG. The figure which shows an example of a structure of the load accommodation route selection means shown in FIG. The figure which shows an example of the distributed power supply equipment data D2. The figure which shows the modification of the load accommodation route selection means shown in FIG. The figure which shows another modification of the load accommodation route selection means shown in FIG. The figure which shows another modification of the load accommodation route selection means shown in FIG. The figure which shows another modification of the load accommodation route selection means shown in FIG. The figure which shows the structure of the power distribution system monitoring control apparatus which concerns on 2nd Embodiment to which this invention is applied. The figure which shows the structure of the program which concerns on 3rd Embodiment to which this invention is applied. The figure which shows the structural example in the case of performing monitoring control of the palace system by the conventional power distribution system monitoring control apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Distribution substation 11 ... Distribution transformer 12, 14a-14c ... Circuit breaker 13 ... Three-phase bus 2a-2c ... Distribution line SWa1-SWa5, SWb1-SWb5, SWc1-SWc4 ... (For distribution line division) Switches SWab to SWca ... Switches STa1 to STa5, STb1 to STb5, STc1 to STc4, STab to STca ... Slave station device 3 ... Distribution system monitoring and control device 30A ... Monitoring control computer 30B ... Display operation device A1 ... Storage unit A2 ... Calculation / communication unit D1 ... Distribution system facility data D2 ... Distributed power supply facility data 31 ... System state monitoring means 32 ... Load accommodation amount calculation means 33, 302 ... Load accommodation route selection means 34 ... Open / close Operation signal output means 301 ... Distributed power supply state grasping means 303 ... Distributed power supply control command means 4 ... Remote monitoring control device 5 ... Communication lines 6f, 6g ... minutes Power 601f, 601g ... electric quantity detecting device 602f, 602 g ... data transmission device 603 f, 603 g ... distributed power external control device 604 ... high-speed signal transmission line 7f, 7 g ... plant load 8f, 8 g ... switch

Claims (9)

In the power distribution system monitoring and control device that receives power supply from the upper power system and monitors or controls the power distribution system connected to a plurality of distributed power sources,
System status monitoring means for monitoring the status of the power distribution system;
Based on the power distribution system equipment data relating to the state of the power distribution system and the equipment of the power distribution system, a power interchange amount calculation means for calculating a power interchange section in the power distribution system and a load capacity for the power outage section,
Distributed power source state grasping means for grasping the state of the distributed power source based on the amount of electricity of the distributed power source;
Select a load accommodation route for load accommodation of the load accommodation amount in the distribution system based on the state of the distributed power source, the load accommodation amount, distributed power facility data on the facility of the distributed power source, and the distribution system facility data A power distribution system monitoring and control device comprising load accommodation route selection means for performing power distribution route selection. The distributed power supply state grasping means is
A measurement data matching check unit for checking temporal matching between the electrical quantity measurement data of the distributed power source;
A measurement data temporal change check unit for checking a temporal change of the electric quantity measurement data that is time-matched;
The distributed power supply state determination unit for determining whether or not the distributed power supply is disconnected from the distribution system due to an accident based on the check result of the time change. 2. The distribution system monitoring and control device according to 1. The load accommodation route selection means is:
A load accommodation amount correction calculation unit for correcting the load accommodation amount according to the state of the distributed power source based on the state of the distributed power source, the load accommodation amount, and the distributed power facility data, and obtaining a corrected load accommodation amount; ,
Based on the distribution system facility data, a load accommodation route candidate extraction unit that extracts load accommodation route candidates for performing load accommodation of the corrected load accommodation amount in the distribution system;
Based on the state of the distributed power source and the distributed power facility data, a distributed power source influence calculating unit that calculates the degree of influence on the distributed power source at the time of system switching for performing the load accommodation,
Using the priority determined based on the number of switches to be operated at the time of system switching and the degree of influence on the distributed power source, the candidate having a higher priority among the candidates is determined as the load accommodation route. The distribution system monitoring and control device according to claim 1, further comprising a load accommodation route determination unit that performs the operation. The load accommodation route selection means determines the presence or absence of interconnection with the distributed power source for each part in the distribution system based on the state of the distributed power source and the distributed power facility data, and includes among the candidates for the load accommodation route. The distribution system monitoring and control device according to any one of claims 1 to 3, wherein a candidate that is not connected to a distributed power source is preferentially selected. The load accommodation route selection means determines the type and output stability of the distributed power source based on the distributed power facility data, and is linked to a distributed power source having high output stability from among the load accommodation route candidates. The distribution system monitoring and control device according to any one of claims 1 to 4, wherein the candidate is preferentially selected. The load accommodation route selection means determines the operation state of the distributed power source based on the state of the distributed power source and the distributed power source equipment data, and uses the priority order determined according to the operation state, and uses the load accommodation method. The distribution system monitoring and control device according to any one of claims 1 to 5, wherein a candidate having a high priority is selected from route candidates. Based on the load accommodation route and the distributed power facility data, the distributed power source connected to the load accommodation route is identified, and system switching for performing the load accommodation for the control device of the distributed power source The distribution system monitoring control according to any one of claims 1 to 6, further comprising a distributed power supply control command means for transmitting a control command for minimizing an influence on the distributed power supply. apparatus. Power distribution system monitoring and control using a power distribution system monitoring and control device having a storage unit, a calculation unit, and a communication unit to receive power from a higher power system and to monitor or control a power distribution system linked to a plurality of distributed power sources In the method
A system state monitoring step of monitoring the state of the distribution system through the communication unit by the arithmetic unit,
Based on the state of the power distribution system and the power distribution system facility data relating to the power distribution system equipment stored in the storage unit, the arithmetic unit calculates a power outage section in the power distribution system and a load accommodation amount for the power outage section. Load capacity calculation step,
A distributed power source state grasping step for grasping the state of the distributed power source based on the amount of electricity of the distributed power source obtained through the communication unit by the arithmetic unit;
Based on the state of the distributed power source, the load accommodation amount, the distributed power facility data relating to the facility of the distributed power source stored in the storage unit, and the distribution system facility data by the arithmetic unit, the power distribution system A distribution system monitoring and control method comprising a load accommodation route selection step for selecting a load accommodation route for performing load accommodation of a load accommodation amount. In a power distribution system monitoring and control program that uses a computer to receive power from a higher power system and monitor or control a power distribution system linked to a plurality of distributed power sources,
A system state monitoring function for monitoring the state of the distribution system;
Based on the power distribution system equipment data relating to the state of the power distribution system and the equipment of the power distribution system, a power capacity calculation function for calculating a power capacity for the power outage section and the power outage section in the power distribution system,
A distributed power supply state grasping function for grasping the state of the distributed power supply based on the amount of electricity of the distributed power supply;
Select a load accommodation route for load accommodation of the load accommodation amount in the distribution system based on the state of the distributed power source, the load accommodation amount, distributed power facility data on the facility of the distributed power source, and the distribution system facility data A distribution system monitoring and control program that causes the computer to realize a function for selecting a load accommodation route.

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