JP2012239307A - Power system stabilization system, power system stabilization method and power system stabilization program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent overcontrolling by setting control contents for each accident detection timing.SOLUTION: A power system stabilization system S includes: a control table storage section 105a for storing a control table deciding control contents required for stability maintenance of a power system for a plurality of respective detection methods different in accident detection timing about each of a plurality of accident types; an accident information acceptance section 105b for accepting the input of accident information including a detection method and an accident type at the occurrence of a system accident; an accident type matching section 105g and a detection method matching section 105h for matching the accident type and detection method in the accident information accepted by the accident information acceptance section 105b against the control table; and a control content selection section 105i for selecting a control content in the control table in accordance with results of matching by the accident type matching section 105g and detection method matching section 105h.

Description

  Embodiments of the present invention provide a power system stabilization system and a power system stabilization method for maintaining stable operation of a power system by disconnecting some generators from the power system at a high speed when an accident occurs in the power system. And a power system stabilization program.

  When an accident such as a lightning strike occurs in the power system, the accident elimination relay system can remove the accident at high speed and in the minimum range. Thereby, the influence of the accident on a system | strain can be suppressed to the minimum.

  However, despite the operation of the accident elimination relay system, the system configuration after the accident elimination due to the occurrence of a serious accident such as a delay in the accident elimination due to circuit breaker malfunction, extensive accident interruption, route interruption accident, etc. has changed significantly In some cases, abnormal changes in the system may occur due to sudden changes in the tidal current and a significant imbalance in supply and demand. If this is left unattended, an abnormal phenomenon that has occurred may spread to the entire power system and expand into a major power outage.

  In order to prevent the occurrence of such an abnormal phenomenon and to prevent the spread of the entire system, an accident ripple prevention relay system exists. This accident ripple prevention relay system is commonly called a power system stabilization system or a power system stabilization device (hereinafter referred to as a power system stabilization system).

  Various types of power system stabilization systems have been developed according to the target abnormal phenomenon (step-out phenomenon, frequency abnormality, voltage abnormality, overload, etc.). As an example of such a power system stabilization system, a system (step-out prevention prevention relay system) that prevents step-out of the generator in advance can be cited.

  Here, the step-out is a phenomenon in which the balance between the mechanical input and the electrical output of the synchronous generator is lost due to the voltage drop at the time of failure, and the generator cannot maintain the synchronous operation. If this step-out is left unattended, a large number of generators can be chained to stop, which can spread to wide-area power outages.

  For this reason, it is necessary to prevent the step-out of the generator by the step-out prevention relay system and to stabilize the system. The basic configuration of the power system stabilization system for other abnormal phenomena (frequency abnormality, voltage abnormality, overload) is the same as that of the step-out prevention relay system.

  Such power system stabilization systems can be roughly classified into two types: (A) post-calculation type and (B) pre-calculation type. The pre-operation type is classified into (B-1) offline pre-operation type and (B-2) online pre-operation type. These will be briefly described below.

(A) Post-calculation type In the post-calculation type method, first, the system acquires online system information during and after the accident. And based on the acquired system | strain information, a system performs prediction calculation about a future phenomenon. Furthermore, based on the result of the prediction calculation, the system calculates the control amount of the controlled generator and the like, and immediately executes the control.

(B) Pre-calculation type In the pre-calculation type method, first, the system calculates and sets the control amount in advance by assuming an accident and a system phenomenon based on the system information before the accident occurs. When an accident actually occurs, the system refers to the control amount that has been set in advance and immediately performs control. Such pre-calculation types can be classified into offline pre-calculation types and online pre-calculation types.

(B-1) Off-line pre-computation type The off-line pre-computation type is a system in which a detailed stability calculation is performed offline for an assumed system state and a control table is determined in advance.

(B-2) Online pre-calculation type The online pre-calculation type uses the system information (online data) obtained online by the system, such as the actual power flow status and circuit breaker on / off information. This is a method for creating a control table.

As described above, the difference between the offline pre-calculation type and the online pre-calculation type is whether the control table is set based on the offline detailed stability calculation of the human system or the system based on the online detailed stability calculation. Divided by. However, the following points are common.
(1) For the assumed system fault type, control content is calculated and determined in advance, and the result is stored as a control table.
(2) When an accident occurs, the control type is determined by comparing the accident type with the control table.

  Here, the accident type is information relating to the occurrence and type of the accident. For example, information such as what-phase / line-fault accident is an example of an accident type. More specifically, in the case of detecting an accident with only one phase of one line in a two-line transmission line, the accident type is one-phase one-line ground fault (1φ1LG) and three phases when an accident is detected with three phases of one line. It is expressed as a 3-wire ground fault (3φ3LG). The accident type is information that can determine the accident aspect and is included in the accident condition.

  By the way, in the control table set in the above-described pre-calculation type power system stabilization system, a set of control contents (electric generator conditions) is set for each of a plurality of assumed accident types. It was a thing. The control content stored in this control table may be switched according to the system state (power system operation pattern) such as the number of operation lines of the power transmission line. However, there was no change in the control table in which a set of control contents was set for one accident type.

An example of such a control table is shown in FIG. In this example, the following settings are made according to the type of system fault detected.
(1) In the case of accident type 1, power is limited to generators G1, G2, and G3
(2) In case of accident type 2, power generators G1 and G2 are power limited
(3) In the case of accident type n, the power supply of the generator G2 is limited. Thus, in the conventional pre-computation type power system stabilization system, a set of control contents is set for each accident type.

  Since the accident type is configured as described above, the determination of the accident type is performed based on the number and combination of phases in which the accident is detected. There are various methods for detecting a system fault. For example, an accident can be detected by capturing the operation of the accident elimination relay system, the state change of the circuit breaker, the change in the amount of electricity in the power system, and the like. In practice, the system is configured so that a system fault can be reliably detected by combining these plural methods.

  An example of logic for detecting an accident by combining a plurality of such accident detection methods is shown in FIG. In this example, the logic for detecting an accident using three accident detection methods (1 to 3) is used, but the logic is not limited to three.

  As a specific example of these three accident detection methods 1 to 3, an example of an accident detection logic for a transmission line is shown in FIG. In this example, the following signals are used as the accident detection methods 1 to 3.

[Accident detection method 1 ... Detection of accident removal relay system operation]
More specifically, a system fault can be detected by an operation signal (52TX) which means that a break command has been output from the power line protection relay to the breaker.

[Accident detection method 2 ... Accident detection due to circuit breaker status change]
More specifically, a system fault can be detected by a signal indicating that the circuit breaker has changed from an “on” state to a “off” state. At this time, there may be an AND condition of a condition in which the operation signal of the active power change relay element (91D) is extended by an off-delay timer or the like and the circuit breaker “off” operation signal. This is for detecting only the state change of the circuit breaker due to the system fault.

[Accident detection method 3 ... Electricity change detection]
More specifically, a system fault can be detected by detecting that the current flowing through the power transmission line is lost by the operation signal of the undercurrent relay element (37). At this time, there may be an AND condition between the condition in which the operation signal of the active power relay element (91P) is extended by an off-delay timer or the like and the insufficient current relay element (37). This is to detect only when the current flowing through the transmission line disappears due to a system fault.

  FIG. 21 shows an example of an accident detection timing chart by the accident detection logic shown in FIG. As shown in FIG. 21, when a system fault occurs, the accident elimination relay system operates and a cutoff command is output from the accident elimination relay system to the circuit breaker. As a result, the circuit breaker operates and enters the “OFF” state. When the circuit breaker is in the “off” state, no current flows through the transmission line.

  The timing T0 of occurrence of the accident can be determined by the operation signal of the active power change relay element (91D). Regarding the accident detection, the timing T1 that is usually detected by the operation of the accident elimination relay system is the earliest. Next, the timing T2 at which an accident is detected by a change in state of the circuit breaker follows. And the method of detecting an accident by capturing the change in the amount of electricity in the power system is the latest timing T3. Therefore, in this example, after an accident occurs, the accident is detected in the order of accident detection method 1, accident detection method 2, and accident detection method 3. As described above, the timing of detecting an accident varies depending on the system fault detection method.

IEEJ Technical Report No. 801 “Relaying System and Accident Prevention Relay Technology”, The Institute of Electrical Engineers of Japan, October 2000, p5, 6, 52, 54, 55, 74, 84, 85, 87

Japanese Patent No. 3350265

  By the way, in the control by the power system stabilization system, the influence of the accident spread can be suppressed as the accident is detected early and the control timing is advanced. For this reason, there exists a tendency which can be stabilized with a small control amount, so that control timing is early. On the contrary, as the detection of an accident is delayed and the control timing is delayed, the influence of the accident spreads and the control amount for stabilization tends to increase.

  On the other hand, as described above, in the conventional power system stabilization system, one set of control content is set for each accident type. Each accident type may be detected by an accident detection method with an early detection timing, but may be detected by a late accident detection method. For this reason, if it is necessary to set a set of control details for a certain accident type, it is necessary to set control details that can be reliably stabilized even when detection is performed by the slowest detection method.

  However, the control content adapted to the case of detection by the slowest detection method as described above tends to be over-controlled because the control amount increases. That is, actually, when an accident is detected by an earlier detection method, a control amount that is more than necessary is selected even though a small control amount is sufficient.

  For example, in the control table shown in FIG. 18, the accident type 1 is set to limit the power supply of the generators G1, G2, and G3. This is a control content that can be stabilized even when an accident is detected by the slowest detection method. Then, when an accident is detected by an earlier detection method, there is a possibility that stabilization can be achieved with a small control amount. In that case, restricting the power supply to all the generators G1, G2, and G3 is excessive control.

Examples of such excessive control problems include the following.
(1) Frequency abnormalities and supply failures due to excessive power limitation
(2) Increased burden on operators who restore power generation facilities that are controlled more than necessary

  As described above, in the conventional pre-computation type power system stabilization system, since one set of control contents is set for each accident type, there is a tendency to over-control.

  Embodiments of the present invention have been proposed to solve the above-described problems of the prior art, and the purpose thereof is to prevent excessive control by setting control details for each accident detection timing. It is to provide a power system stabilization system, a power system stabilization method, and a power system stabilization program.

An embodiment for achieving the above object is a power system stabilization system having the following configuration.
(a) For each of a plurality of accident types, a control table storage unit that stores a control table in which control details necessary for maintaining the stability of the power system are determined for each of a plurality of pieces of detection information having different accident detection timings
(b) Accident information reception unit that receives input of accident information including detection information and accident type when a grid fault occurs
(c) A collation unit that collates accident information received by the accident information reception unit with a control table stored in the control table storage unit.
(d) A control content selection unit that selects the control content in the control table based on the collation result of the collation unit

  Note that this embodiment can also be understood as a method for realizing the functions of the above-described units by a computer or an electronic circuit and a program executed by the computer.

  In the above configuration, excessive control can be prevented by setting the control contents for each accident detection timing.

A block diagram showing an example of composition of a 1st embodiment The block diagram which shows an example of the application to the electric power grid of 1st Embodiment Explanatory drawing which shows an example of the control table of 1st-3rd embodiment. Explanatory drawing which shows an example of the accident information of 1st Embodiment Explanatory drawing which shows an example of the accident detection logic of 1st Embodiment Time chart explaining accident information reception timing of the first embodiment The flowchart which shows the procedure of the control content determination process of 1st Embodiment. The flowchart which shows the procedure of the control content determination process by the other aspect of 1st Embodiment. The block diagram which shows an example of a structure of the control content determination means of the aspect of FIG. The block diagram which shows an example of a structure of the control content determination means of 2nd Embodiment Explanatory drawing which shows an example of the accident classification of 2nd Embodiment The flowchart which shows the procedure of the control content determination process of 2nd Embodiment. Explanatory drawing which shows an example of the control table of 4th Embodiment The block diagram which shows an example of a structure of the control content determination means of 4th Embodiment Explanatory drawing which shows an example of the accident information of 4th Embodiment The flowchart which shows the procedure of the control content determination process of 4th Embodiment. The block diagram which shows the other aspect of 4th Embodiment Explanatory drawing which shows an example of the conventional control table Explanatory drawing showing an example of conventional accident detection logic Explanatory drawing showing a specific example of a conventional accident detection method Time chart showing an example of accident detection timing

[First Embodiment]
[Constitution]
[1. overall structure]
The overall configuration of this embodiment will be described with reference to FIGS. 1 and 2. The present embodiment is an example of an online pre-calculation type power system stabilization system S. However, with regard to basic components, the offline pre-operation type and the online pre-operation type are equivalent. In FIG. 2, N1 is a power system, N2 is a power supply information network, 1 is a generator, 2 is a bus, 3 is a power transmission line or transformer, 4 is a circuit breaker (CB), and 5 is a current measuring device (CT). , 6 is a voltage measuring device (VT), 7 is an accident elimination relay system, and 8 is a communication facility.

  As shown in FIGS. 1 and 2, the power system stabilization system S of the present embodiment includes a central processing unit 9, a processing unit 10, an accident detection terminal unit 11, a control terminal unit 12, and the like. The central processing unit 9, the processing unit 10, the accident detection terminal unit 11, and the control terminal unit 12 are configured to be able to transmit / receive (input / output) information to / from each other via a communication facility (including a communication network and a transmission / reception unit) 8. ing.

  Information transmitted and received in the present embodiment is managed along with time (detection processing, generation processing, transmission / reception processing, storage processing, etc.) by managing transmission delay time or adding a time stamp to transmission data. The timing of each process can be grasped.

  The central processing unit 9 is connected to the power supply information network N2 through the communication facility 8. As a result, the central processing unit 9 can obtain the system information online from the power supply information network N2 and set the control table by calculation. Such a central processing unit 9 is often installed at a power supply command station, for example.

  The arithmetic device 10 is installed in a place where it can communicate with the central arithmetic device 9, the accident detection terminal device 11, and the control terminal device 12. Thereby, the arithmetic device 10 can collate the accident information received from the accident detection terminal device 11 with the control table input from the central arithmetic device 9, determine the control content, and output it to the control terminal device 12. . Such an arithmetic device 10 may be installed in the same place as the accident detection terminal device 11 or the control terminal device 12, for example.

  For example, as shown in FIG. 2, the accident detection terminal device 11 is connected to a circuit breaker 4, a current measuring device 5, a voltage measuring device 6, an accident removing relay system 7 and the like in the power transmission system. Although detailed illustration is omitted, the accident detection terminal device 11 is configured to be able to mount various relay elements (91D, etc.) as exemplified in FIGS. 20 and 21 and the description corresponding thereto. Has been. Thereby, the accident detection terminal device 11 is configured to detect an accident by a plurality of accident detection methods (hereinafter simply referred to as a detection method), generate accident information including the accident type, and output the accident information to the arithmetic device 10. ing. Such an accident detection terminal device 9 is often installed at, for example, a substation.

  For example, as shown in FIG. 2, the control terminal device 12 is connected to the circuit breaker 4, the current measuring device 5, the voltage measuring device 6, and the like in the system to which the generator 1 is connected. Thereby, based on the control content determined in the arithmetic unit 10, the control terminal device 12 can output a cutoff command to the circuit breaker 4, and can perform control such as disconnecting the generator. Such a control terminal device 12 is often installed in a power plant, for example.

  Each device illustrated in FIG. 1 and FIG. 2 is virtually illustrated. A plurality of objects may be prepared according to the number and positions of detection objects and control objects. For example, the calculation device 10 may be configured to perform processing based on accident information from a plurality of accident detection terminal devices 11. The number and types of objects managed by one accident detection terminal device 11 are also free. The number of controlled objects controlled by one control terminal device 12 is also free.

  Each of the above devices can be realized by controlling a digital relay or a computer with a predetermined program. For this reason, each device can be realized by separate hardware or by common hardware. For example, the arithmetic device 10 can be configured to include the functions of the accident detection terminal device 11 or the control terminal device 12. For example, the central processing unit 9 can be configured to include the function of the processing unit 10.

  The above program realizes the processing of each means and each part as described below by physically utilizing the hardware. For this reason, said apparatus structure is an illustration to the last, and it is not limited to a specific aspect about which function of the following each means and each part the hardware which comprises a system bears.

  Furthermore, the following means, an apparatus, a method, a program, a recording medium on which the program is recorded, and the like that execute processing of each unit are also one aspect of the embodiment. How to set the range to be processed by hardware and the range to be processed by software including a program is not limited to a specific mode. For example, any one of the following means and units can be configured as a circuit that realizes each processing.

[2. Central processing unit]
The central processing unit 9 includes system information collection means 101, system model creation means 102, analysis condition setting means 103, stability determination means 104, and the like.

[2-1. System information collection means]
The system information collection unit 101 is a processing unit that collects the connection state of the power system and the power supply / demand state as system information via the power supply information network. The connection state of the power system includes, for example, power transmission lines, transformer circuit breaker information, and the like. Power supply and demand conditions include, for example, generator active and reactive power output, load active and reactive power consumption, generator and load bus voltage, transmission and transformer active and reactive power flow, etc. .

[2-2. System model creation means]
The system model creating unit 102 is an analysis system that represents the current power flow state based on the system information collected by the system information collecting unit 101 and system facility data stored in advance in a storage unit (not shown). A processing unit for creating a model. The system facility data includes, for example, transmission lines, transformer impedance, generator constants, control system data, and the like.

[2-3. Analysis condition setting means]
The analysis condition setting unit 103 is a processing unit that sets a plurality of analysis conditions based on the analysis system model created by the system model creation unit 102 and a plurality of assumed accident type data. In order to realize this process, the analysis condition setting unit 103 includes a system model storage unit 103a, an assumed accident type storage unit 103b, a detection information storage unit 103c, an analysis condition setting unit 103d, and the like.

  The system model storage unit 103 a is a storage unit that stores the analysis system model created by the system model creation unit 102. The assumed accident type storage unit 103b is a storage unit that stores a plurality of assumed accident type data. The detection information storage unit 103c is a storage unit that stores detection information of a grid fault. The detection information includes, for example, an accident detection method. Furthermore, the control timing set for each detection method is also stored in the detection information storage unit 103c of the present embodiment. The control timing is a timing determined by the detection timing by each detection method and the operation time of the power system stabilization system S.

  For example, the operation time of the power system stabilization system S is set to 150 ms. Here, the operation time is a time from when the power system stabilization system S detects a system fault until the power generator is disconnected. The detection timing by the detection method 1 shown in the above example is 30 ms after the occurrence of the accident, the detection timing by the detection method 2 is 70 ms, and the detection timing by the detection method 3 is 100 ms. Then, the control timing of detection method 1 is 180 ms after the occurrence of the accident, the control timing of detection method 2 is 220 ms, and the control timing of detection method 3 is 250 ms. However, these are merely examples, and the present embodiment is not limited to these values.

  The analysis condition setting unit 103d is a processing unit that sets a plurality of analysis conditions based on the analysis system model, assumed accident type data, detection method, control timing, and the like. The analysis conditions in the present embodiment include, for example, combinations of electric generators corresponding to the electric control capacities determined for each system fault detection method for a plurality of assumed accident type data.

[2-4. Stability determination means]
The stability determination means 104 performs transient stability calculation based on the above analysis conditions, determines the stability of the power system for each analysis condition, and maintains the stability of the power system when each assumed accident type occurs. It is a processing unit that sets a necessary electric generator as a control table.

  In order to realize this processing, the stability determination unit 104 includes an analysis condition storage unit 104a, a transient stability calculation unit 104b, a stability determination unit 104c, a control table setting unit 104d, and the like. The analysis condition storage unit 104 a is a storage unit that stores each analysis condition set by the analysis condition setting unit 103. The transient stability calculation unit 104b is a processing unit that performs transient stability calculation for each analysis condition stored in the analysis condition storage unit 104a.

  The transient stability calculation is a simulation that simulates the sway of each generator that occurs when a system fault occurs. As the relative phase angle difference between the generators increases over time after the accident, the stability becomes lower. For this reason, stability is relatively high under analysis conditions with early control timing, and the amount of control required to maintain stability tends to be small. On the other hand, when the analysis conditions are late in control timing, the control amount tends to increase.

  The stability determination unit 104c determines the stability for each analysis condition using the calculation result of the transient stability calculation unit 104b, and the power control necessary for maintaining the stability of the power system when each assumed accident type occurs. It is a processing unit for obtaining a generator for each accident detection method.

  The control table setting unit 104d is a processing unit that sets the determination result of the stability determination unit 104c as a control table. In the present embodiment, for each accident type, a control table is created in which the control content (combination of control generators) is determined for each of a plurality of detection methods. For example, as shown in FIG. 3, a table in which the control content according to the detection methods 1 to 3 is set for each accident type 1 to n is created.

[3. Arithmetic unit]
The arithmetic unit 10 includes a control content determination unit 105 and the like. The control content determination means 105 is a processing unit that determines an electric generator according to detected accident information. In order to realize this processing, the control content determination means 105 includes a control table storage unit 105a, an accident information reception unit 105b, a set time storage unit 105c, an accident information storage unit 105d, a time measurement unit 105e, an accident information selection unit 105f, an accident A type verification unit 105g, a detection method verification unit 105h, a control content selection unit 105i, and the like are included.

  The control table storage unit 105 a is a storage unit that stores the control table set in the stability determination unit 104. The accident information reception unit 105 b is a processing unit that receives accident information transmitted from the accident detection terminal device 11. The set time storage unit 105c is a storage unit that stores a set time Tmax at which the accident information receiving unit 105b receives the accident information, starting from the time when the accident information is first received.

  The accident information storage unit 105d is a storage unit that stores the accident information received by the accident information reception unit 105b. The time measuring unit 105e is a processing unit that measures the time from when the accident information is first received and ends the measurement when the set time Tmax stored in the set time storage unit 105c has elapsed. The accident information selection unit 105f is a processing unit that selects accident information received at the beginning of the set time Tmax from the accident information stored in the accident information storage unit 105d.

  The accident type collating unit 105g is a processing unit that performs collation with the control table for the accident type in the selected accident information. The detection method collating unit 105h is a processing unit that performs collation with the control table for the detection method in the accident type on the premise of collation by the accident type collating unit 105g. The processing unit including the functions of the accident type verification unit 105g and the detection method verification unit 105i can be regarded as a “verification unit”. The control content selection unit 105i is a processing unit that selects the control content based on the verification result of the detection method verification unit 105h.

[4. Accident detection terminal device]
The accident detection terminal device 11 includes an accident information detection means 106 and the like. The accident information detection means 106 is a processing unit that detects an accident by determining an accident type or the like for each detection information of an accident, using an occurrence of an accident in the power system as a starting condition. In order to realize this processing, the accident information detection means 106 includes an accident detection unit 106a, a detection information determination unit 106b, an accident type determination unit 106c, an accident information generation unit 106d, and the like.

  The accident detection unit 106a is a processing unit that detects the occurrence of an accident in the power system based on a signal input from the outside. The detection information determination unit 106b is a processing unit that determines accident detection information. In the present embodiment, for example, a detection method used when an accident is detected is determined as the detection information. For this reason, the detection information determination unit can be regarded as a detection method determination unit. The accident type determination unit 106c is a processing unit that determines the accident type based on a signal input from the outside. The accident information generation unit 106 d is a processing unit that generates accident information to be output to the control content determination unit 105. The accident information includes the accident type. As accident information of this embodiment, what added the detection method which detected the said accident to the accident classification of the detected accident is produced | generated, for example. An example of such accident information is shown in FIG.

  A specific example of the accident detection method by each detection method is as shown in FIGS. 21 and 22 and the description corresponding thereto. However, in this embodiment, accident information is generated and transmitted for each of a plurality of detection methods. For this reason, when one system fault occurs, the control content determination means 105 receives accident information a plurality of times.

[5. Control terminal device]
The control terminal device 12 has a control means 107. The control unit 107 is a processing unit that performs control such as power supply restriction according to the control content determined by the control content determination unit 105. For example, the generator can be disconnected from the power system by outputting an opening operation instruction to the circuit breaker 4 corresponding to the generator to be controlled.

[6. Storage unit]
Although not shown in each of the above devices, in addition to the storage unit explicitly shown above, information transmitted / received (input / output), detected, generated, etc. in each device, etc. of the power system stabilization system S A storage unit that stores various information necessary for processing is configured. The information stored in the storage unit includes each means, arithmetic expressions for processing of each unit, parameters, reference values (including threshold values), and the like.

[7. Input section]
Although not shown, an input unit is connected to each of the above devices. This input unit is a component that inputs information necessary for the power system stabilization system S (including the above-described various types of information), selects and instructs a process, and the like. As the input unit, for example, a switch, a touch panel (including one configured in a display device), a keyboard, a mouse, and the like are conceivable. However, all input devices available now or in the future are included.

[8. Output section]
Although not shown, an output unit is connected to each of the above devices. This output unit outputs information that is subject to processing in the power system stabilization system S, such as electric quantity information, accident information, operation information, and setting information, so that a user such as an operator can recognize the information. It is. As this output unit, for example, a display device, a printer, or the like can be considered. However, any output device available now or in the future is included.

[Action]
The operation of the present embodiment having the above configuration will be described.
[1. Control table settings]
First, in the present embodiment, as described above, based on the system information collected by the system information collection unit 101, generation of a system model for analysis by the system model generation unit 102 and setting of analysis conditions by the analysis condition setting unit 103 The control table is set by the stability determination means 104.

  Note that the system information changes every moment, and accordingly, the appropriate control amount also changes. For this reason, the information collected, set, calculated, determined, stored, etc. in the system information collection unit 101, the system model creation unit 102, the analysis condition setting unit 103, and the stability determination unit 104 is also a predetermined period or necessary information. It is assumed that it is updated after waiting for input. Therefore, the optimal control table is always set.

[2. Accident detection]
When a system fault occurs, the accident detection unit 106a in the accident information detection unit 106 detects the accident based on the system information. In the present embodiment, the accident information detection unit 106 detects an accident for each detection method, and outputs accident information including each accident type and detection method.

  An example of such an accident detection logic is shown in FIG. That is, in this embodiment, every time the accident detection unit 106a detects an accident, the detection information determination unit 106b determines the detection method and the accident type determination unit 106c determines the accident type. Then, the accident information generation unit 106d generates accident information in which the detection method for detecting the accident type is added to the information of the accident type (see FIG. 4). Such accident information is transmitted to the arithmetic device 10 by the transmission / reception unit.

[3. Determination of control details]
Next, the processing procedure in the arithmetic unit 10 that receives the accident information input from the accident information detection means 106 will be described with reference to the flowchart of FIG. First, as a premise, the control table storage unit 105a in the control content determination unit 105 appropriately updates the stored control table with the information transmitted from the stability determination unit 104 as described above.

  In this state, the accident information reception unit 105b waits for input of accident information (NO in step 70). When an accident occurs, the accident information receiving unit 105b receives the accident information transmitted from the accident information detecting means 106 (YES in step 70). The accepted accident information is stored in the accident information storage unit 105d (step 71).

  When time measurement is not being performed (NO in step 72), the time measurement unit 105e starts time measurement assuming that the first accident information has been received (step 73). The accident information selection unit 105f selects the accident information received first and stored in the accident information storage unit 105d (step 74). The accident type collation unit 105g collates the accident type in the selected accident information with the control table (step 75). For the accident type determined to match by this collation, the detection method collation unit 105h collates the accident detection method with the control table (step 76).

  The control content selection unit 105i selects the control content in the item determined by the detection method matching unit 105h that the detection methods match (step 77). The selected control content is output to the control terminal device 12 by the transmission / reception unit (step 78). In the control terminal device 12, the control means 107 instructs the disconnection of the electric power generator determined by the selected control content.

  In addition, when the accident information is received and stored (YES in step 70, step 71), if the time measurement unit 105e is already measuring time (YES in step 72), the accident information that is not the first is received. As a result, collation based on the accident information is not performed. That is, the accident information reception unit 105b waits for the subsequent input of the accident type (NO in step 70).

  Further, when the accident information is accepted and stored (YES in step 70, step 71), if the time measurement unit 105e is not measuring time (NO in step 72), the first accident information is received. As shown in FIG. That is, the reception time measuring unit 105e ends the time measurement when it is determined that the set time Tmax has elapsed since the start of time measurement (see Tmax on the left in FIG. 6). For this reason, the accident information received for the first time after that is the reception of the first accident information. Therefore, a new control content determination process is performed based on the accident information (see Tmax on the right in FIG. 6).

  As described above, the accident information detection unit 106 detects an accident using a plurality of detection methods with different detection timings, and transmits accident information including the accident type and the detection method each time. For this reason, as shown in FIG. 6, the control content determination means 105 receives accident information several times when one system fault occurs.

  In the present embodiment, as described above, the control table is collated only for the accident information received first during a preset time Tmax starting from the time when the accident information was first received. The control table is not checked against the received accident information. Thereby, this embodiment controls only with respect to the accident classification detected with the detection method at the earliest timing.

[effect]
According to the present embodiment as described above, the control content can be determined not only according to the type of accident of the system fault but also according to the detection method with different detection timing. For this reason, conventionally, even in the case where over-control is performed in accordance with detection at a later timing, control suitable for detection at an earlier timing can be realized, and over-control is prevented.

  Therefore, in the present embodiment, it is possible to prevent frequency abnormality and supply failure due to excessive control, and improve the reliability of power supply in the power system. In addition, it is possible to reduce the operation for restoring the over-controlled power generation facility and the like and the opportunity for analyzing the operation of the power system stabilization system S, thereby reducing the burden on the operator.

  In the above embodiment, when an accident occurs, the control content determination unit 105 receives the accident information a plurality of times. For this reason, as described above, the control content determination means 105 needs to select the accident information necessary for determining the control content from the received multiple times of accident information.

  However, the accident information detection means 106 may transmit the accident information only for the accident detected first by the accident detection unit 106a. In this case, the process of selecting the accident information is not necessary, and the process in the control content determination unit 105 can be simplified as shown in the flowchart of FIG.

  That is, when an accident occurs, the accident information receiving unit 105b receives the accident information transmitted from the accident information detecting means 106 (YES in step 80). The accepted accident information is stored in the accident information storage unit 105d (step 81).

  The accident type collation unit 105g collates the accident type in the stored accident information with the control table (step 82). For the accident type determined to match by this collation, the detection method collation unit 105h collates the accident detection method with the control table (step 83).

  The control content selection unit 105i selects the control content in the item determined by the detection method matching unit 105h that the detection methods match (step 84). The selected control content is output to the control terminal device 12 by the transmission / reception unit (step 85).

  Therefore, when this mode is adopted, as shown in FIG. 9, the set time storage unit 105c, the time measurement unit 105e, and the accident information selection unit 105f in the above configuration can be omitted.

[Second Embodiment]
[Constitution]
This embodiment is basically the same configuration as the first embodiment. However, the control content determination means 105 in this embodiment has an accident type comparison unit 105j as shown in FIG. The accident type comparison unit 105j is a processing unit that compares the severity of the accident type in the accident information received earlier and the accident information received later when the accident information is received a plurality of times.

  Further, the accident information selection unit 105f, when the accident type comparison unit 105j determines that the accident type of the accident information received later is more severe, the accident information matching unit 105g, The detection method matching unit 105h has a function of selecting as a target for verification.

  The severity of accident type is the magnitude of the effect on the power system. For example, 3φ4LG can be given in the relative order of each accident type, which is stricter than 2φ3LG. An example in which the assumed accident types are arranged in a severe order is shown in FIG. This example is an accident type for a two-line transmission line. As shown in FIG. 11, among the assumed accident types, accident type 1 (3φ4LG) has the largest impact in severe ranking 1, and accident type n (1φ1LG) has the smallest impact type in severe ranking n. Yes.

  In the present embodiment, ranks corresponding to the severity of such accident types are given to the accident type data stored in the assumed accident type storage unit 103b. The accident type data to which such order is assigned is reflected in the control table set by the control table setting unit 104d.

[Action]
The operation of the present embodiment as described above will be described. First, as a premise, generation of a control table and detection of an accident are performed in the same procedure as described above. However, the order of severity is reflected in the control table.

  Next, a processing procedure in the arithmetic unit 10 that receives the input of accident information from the accident information detection means 106 will be described with reference to the flowchart of FIG. First, as a premise, the control table storage unit 105a in the control content determination unit 105 appropriately updates the stored control table with the information transmitted from the stability determination unit 104 as described above.

  In this state, the accident information reception unit 105b waits for the input of the accident type (NO in step 1201). When an accident occurs, the accident information receiving unit 105b receives the accident information transmitted from the accident detection terminal device 11 (YES in step 1201). The accepted accident type is stored in the accident information storage unit 105d (step 1202).

  The accident type collation unit 105g collates the accident type in the stored accident information with the control table (step 1203). For the accident type determined to match by this collation, the detection method collation unit 105h collates the detection method with the control table (step 1204).

  The control content selection unit 105i selects the control content in the item determined by the detection method matching unit 105h that the detection methods match (step 1205). The selected control content is output to the control terminal device 12 by the transmission / reception unit (step 1206). In the control terminal device 12, the control means 107 instructs the disconnection of the electric power generator determined by the selected control content.

  When the time measurement unit 105e determines that the set time Tmax has not elapsed since the time when the accident type was received (NO in step 1207), the accident information reception unit 105b waits for subsequent input of accident information (step 1208 NO). When there is an input of accident information, the accident information receiving unit 105b receives it (YES in step 1208). The accepted accident information is stored in the accident information storage unit 105d (step 1209).

  As described above, when accident information is continuously received, the accident type comparison unit 105j compares the severity of the accident type of the accident information received first and the accident information received later based on the control table (step 1210). ). When the accident type comparison unit 105j determines that the accident type is severer than the accident type received first (YES in step 1211), the accident information selection unit 105f selects the accident information received later (step 1212). ). Then, the above-described collation processing, control content selection, and control content output processing are also performed on the accident information received later (steps 1203 to 1206).

  Furthermore, when accident information is continuously received, the accident types of the accident information received after comparing the accident information received earlier and the accident type received later are compared. If the accident type is severer than the accident type received earlier, The control table is collated with respect to the received accident information (steps 1207 to 1212, 1203 to 1206).

  If the accident type comparison unit 105j determines that the accident type received later is less severe (including the same case) than the previously received accident type (NO in step 1211), the collation is not performed again, and step 1207 is performed. Proceed to the process.

  The control content determination unit 105 performs such processing until the set time Tmax has elapsed since the time when the time measurement unit 105e received the accident type (YES in step 1207). Repeat every time it is received.

  For example, the accident type of the accident information received first from the accident information detection means 106 is accident type 2 (detection method 1), the accident type of the accident information received next is accident type 1 (detection method 2), and finally received When the accident type is 1 (detection method 3), the control unit 107 performs the following control. That is, after accident type 2 control (G1 power supply restriction), accident type 1 (detection method 2) control (power supply restriction with G2 added to G1) is performed.

[effect]
According to the present embodiment as described above, among the plurality of detection methods, depending on the detection method that can be detected at the earliest timing, even if the accident could not be detected correctly, the detection was correctly performed by another detection method. Appropriate control is performed based on the accident information.

  Therefore, in this embodiment, it is possible to reliably detect and control an accident by a plurality of detection methods, and in addition to the above-described embodiment, the reliability of the power system stabilization system S can be further improved. For example, it is possible to prevent a situation in which an accident cannot be detected correctly even if an accident information fetch failure detected at the earliest timing occurs.

[Third Embodiment]
This embodiment relates to the setting of the control table in the second embodiment. That is, in this embodiment, the control table setting unit 104d in the stability determination unit 104 sets the control table so that the control generator has an inclusion relationship according to the speed of detection timing for each detection method. It is the composition to do. Here, the inclusion relationship refers to a relationship in which a control content with a small control amount is included in a control content with a larger control amount.

  In the present embodiment, the control table is set so as to have the above inclusion relationship. For this reason, in the control table, the control content of the detection method with the lower severity ranking and the earlier detection timing is included in the control content of the detection method with the more severe accident type and the later detection timing. The control content is determined.

  For example, it is assumed that a control table is set as shown in FIG. 3 and an accident is detected in the order of detection method 1 (T1), detection method 2 (T2), and detection method 3 (T3). In this case, the control content (G1 power supply restriction) of the detection method 1 of the accident type 2 is the control content (G1, G2 power supply restriction) of the detection method 2 with the more severe accident type 1 and the detection timing is late, and the control of the detection method 3 It is included in the contents (G1, G2, G3 power supply restriction). The same relationship applies to other accident types.

  By setting the control table as described above, the following operational effects are obtained in the present embodiment. For example, when the control content determination means 105 receives the accident type 2 first detected by the detection method 1 and then the accident type 1 detected by the detection method 2 as the accident information from the accident information detection means 106 Is assumed. In this case, according to the processing procedure shown in the second embodiment, the control content selection unit 105i selects the control content of the accident type 2 and then selects the control content of the accident type 1.

  Thereby, the control means 107 restricts the power supply of the generator G1 when the accident type 2 is first received, and additionally restricts the power supply of the generator G2 when the accident type 1 is received later. This is because the detection method 1 cannot correctly detect the accident, and even if it is erroneously determined as the accident type 2, the detection method 2 can correctly detect the accident type 1. For this reason, the power supply limitation of the generators G1 and G2, which is appropriate control according to the accident detection timing, can be performed.

  As described above, in the present embodiment, the detection method that can be detected at the earliest timing among the plurality of detection methods, even if the accident type is not correctly detected and the determination of the accident type is wrong, other detection methods Based on the accident type correctly detected by, additional control becomes possible. Thereby, even if one system fault is detected as a plurality of accident types, it is possible to prevent over-control.

[Fourth Embodiment]
[Constitution]
This embodiment is basically the same configuration as the first embodiment. However, this embodiment includes a plurality of detection timings as detection information stored in the detection information storage unit 103c of the analysis condition setting unit 103. Here, the detection timing is, for example, the elapsed time from the accident occurrence timing T0 to the accident detection timing.

  In the control table set by the control table setting unit 104d, the contents of control are set for each assumed accident type at each system fault detection timing. An example of such a control table is shown in FIG. In the example of FIG. 13, three accident detection timing control details are set for each accident type. However, the number of accident detection timings is not limited to three and can be set as many as possible.

  Further, in the present embodiment, as shown in FIG. 14, the control content determination means 105 has a detection timing verification unit 105k. The detection timing collating unit 105k is a processing unit that collates with the control table for the detection timing of the accident type on the premise of collation by the accident type collating unit 105g. The processing unit including the functions of the accident type verification unit 105g and the detection timing verification unit 105k can be regarded as a “verification unit”. The control content selection unit 105i selects the control content based on the collation result of the detection timing collation unit 105k.

  Furthermore, the detection information determination unit 106b in the accident information detection unit 106 of the present embodiment has a function of determining an accident detection timing as detection information. For this reason, the detection information determination unit can be regarded as a detection timing determination unit. The accident detection timing is the time from the accident occurrence timing to the accident detection.

  The occurrence timing T0 of the accident can be detected by the operation of the active power change relay element (91D), for example. An accident is detected by an operation signal corresponding to each detection method. The detection information determination unit 106b determines the detection timing by measuring the time from the occurrence timing of the accident to the detection.

  The accident information generation unit 106d generates accident information in which the determined detection timing (detection information) is added to the detected accident type. An example of such accident information is shown in FIG. Here, the detection method is not specified. Further, even when there are a plurality of detection methods, the determination of the accident detection timing is performed for each.

[Action]
The operation of the present embodiment as described above will be described. First, as a premise, generation of a control table and detection of an accident are performed in the same procedure as described above. However, in the control table, as described above, control contents are set for each of a plurality of detection timings for each assumed accident type.
Further, when a system fault occurs, the accident detection unit 106a in the accident information detection unit 106 detects the accident based on the system information. At this time, the detection information determination unit 106b determines the accident detection timing. And the accident information generation part 106d produces | generates the accident information which added the detection timing to the accident classification, and a transmission / reception part transmits this.

  Thus, the procedure of the process in the arithmetic unit 10 which received the accident information input from the accident information detection means 106 will be described with reference to the flowchart of FIG. First, as a premise, the control table storage unit 105a in the control content determination unit 105a appropriately updates the stored control table with the information transmitted from the stability determination unit 104 as described above.

  In this state, the accident information reception unit 105b waits for the input of the accident type (NO in step 1601). When an accident occurs, the accident information receiving unit 105b receives the accident information transmitted from the accident information detecting means 106 (YES in step 1601). The accepted accident information is stored in the accident information storage unit 105d (step 1602).

  The accident type collating unit 105g collates the accident type of the stored accident information with the control table (step 1603). For the accident type determined to match by this collation, the detection timing collation unit 105k collates the detection timing with the table (step 1604).

  The control content selection unit 105i selects the control content in the item for which the detection timing matching unit 105k determines that the detection timings match (step 1605). The selected control content is output to the control terminal device 12 by the transmission / reception unit (step 1606). The control means 107 of the control terminal device 12 instructs the disconnection of the electric power generator determined by the selected control content.

  For example, it is assumed that the accident type received from the accident information detection means 106 is the accident type 1 and the accident detection timing x is in the range of more than T1 and less than or equal to T2. In this case, the detection timing collating unit 105k collates with the control table shown in FIG. 13 and determines that it corresponds to the accident detection timing T2 of the accident type 1. And the control content selection part 105i selects the control content corresponding to the said detection timing T2, and determines the generators G1 and G2 as a control generator.

[effect]
According to the present embodiment as described above, control according to the accident detection timing is possible regardless of the system fault detection method. This means that, for example, even with the same detection method, different detection timings may be obtained, and even in this case, appropriate control according to the detection timing is possible. Furthermore, even if the individual detection methods are not grasped in advance, it means that appropriate control is possible by setting the detection timing.

  For this reason, for example, even in the case of a system including detection methods from various elements, settings and the like can be easily performed. In particular, even when various types of accident detection are assumed, such as the operation of an accident removal relay system for back-end protection, appropriate control can be easily realized by setting the detection timing.

  In addition, when the accident information received later is more severe than the accident information previously received for a plurality of accident information received during the set time by combining the present embodiment and the second embodiment described above, You may comprise so that additional control may be performed based on the accident information received later. Thereby, in addition to the effect of this embodiment, the effect of 2nd Embodiment is also obtained.

  For example, as shown in FIG. 17, this can be realized by the detection timing collating unit 105 k included in the control content determining unit 105 collating the detection timing in step 1203 of the flowchart of FIG. 12.

[Other Embodiments]
(1) Not only each device described above, but also each means and each unit may be realized by common hardware, or may be realized by a plurality of hardware connected via a communication network. For example, any of the above-described various storage units may be configured by an independent server.

(2) The various storage units described above can typically be configured by various built-in or externally connected memories, a hard disk, an optical disk, and the like. However, any storage medium that can be used now or in the future can be used as the storage unit. A register or the like used for calculation can also be regarded as a storage unit. A mode in which a storage medium in which information has already been stored can be used for computation by being mounted on a reading device may be employed. The mode of storage includes not only a mode in which memory is stored for a long time, but also a mode in which data is temporarily stored for processing and deleted or updated in a short time.

(3) When each part is realized as a circuit, for example, various configurations such as an ASIC that implements each function, an IC chip such as a CPU, or other peripheral circuits, or a system LSI that integrates a plurality of functions are conceivable. It is a thing and is not limited to a specific thing.

(4) The communication network widely includes transmission lines (transmission lines) capable of transmitting and receiving information. As the transmission path, any wired or wireless transmission medium can be applied, and it does not matter what kind of LAN or WAN is used. Any communication protocol that can be used at present or in the future can be applied.

  A method of synchronization between elements constituting the nodes of the communication network is also free. For example, in general sampling synchronization control, the reception timing of timing flags transmitted to each other is premised on the assumption that the fluctuation of the transmission delay time of the transmission line between the nodes (master station and slave station) is small and almost constant. Correction control is performed so that the same timing is obtained from this deviation. Also, synchronization control can be performed by NTP, GPS, or the like.

(5) The specific contents and values of the information used in the embodiment are free and are not limited to specific contents and numerical values. In the embodiment, in the determination of the magnitude of the value, the determination of coincidence / mismatch, and the like, it is determined that the value is included as follows, or is determined not to include the value as being larger (exceeding) or smaller (not exceeding). It is also free.

  The calculation method for system model creation, analysis condition setting, stability determination, etc. is not limited to a specific one, and includes all methods available at present or in the future. The method for creating the control table is not limited. If what is input from the outside by some method is stored in the control table storage unit, the control content determination processing of the present embodiment is possible. For example, a control table created by a user in advance or a control table created by an external computing device can be input and used. For this reason, this embodiment can be configured as an offline pre-computation type system or a simulation system.

(6) Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Generator 2 ... Bus 3 ... Power transmission line or transformer 4 ... Circuit breaker (CB)
5 ... Current measuring instrument (CT)
6 ... Voltage measuring instrument (VT)
7 ... Accident elimination relay system 8 ... Communication equipment 9 ... Central processing unit 10 ... Processing unit 11 ... Accident detection terminal unit 12 ... Control terminal unit 101 ... System information collection unit 102 ... System model creation unit 103 ... Analysis condition setting unit 103a ... System model storage unit 103b ... Assumed accident type storage unit 103c ... Detection information storage unit 103d ... Analysis condition setting unit 104 ... Stability determination means 104a ... Analysis condition storage unit 104b ... Transient stability calculation unit 104c ... Stability determination unit 104d ... Control table setting unit 105 ... control content determination means 105a ... control table storage unit 105b ... accident information reception unit 105c ... set time storage unit 105d ... accident information storage unit 105e ... time measurement unit 105f ... accident information selection unit 105g ... accident type verification Part 105h ... Detection method collation part 105i ... Control content selection part 105j ... Accident type ratio Part 105 k ... detection timing matching unit 106 ... accident information detecting unit 106a ... fault detection unit 106b ... detection information determination unit 106c ... accident type determining unit 106d ... accident information generation unit 107 ... control unit

Claims (8)

For each of a plurality of accident types, for each of a plurality of detection information different in the detection timing of the accident, a control table storage unit that stores a control table in which the control content necessary for maintaining the stability of the power system is determined,
Accident information reception unit that accepts input of accident information including detection information and accident type when a grid accident occurs,
A collation unit that collates the accident information received by the accident information reception unit and the control table stored in the control table storage unit;
A control content selection unit that selects the control content in the control table based on the verification result of the verification unit;
A power system stabilization system comprising:   The power system stabilization system according to claim 1, wherein the detection information includes at least one of an accident detection method and an accident detection timing. The detection information includes an accident detection method,
A detection method storage unit that stores a plurality of the detection methods together with respective control timings;
A control table setting unit that sets the control table based on the control timing stored in the detection method storage unit;
The power system stabilization system according to claim 1, further comprising:   In the control table, the control content of detection information in an accident type with a low severity ranking is included in the control content of detection information with a later detection timing in an accident type with a higher severity ranking. Item 4. The power system stabilization system according to any one of Items 1 to 3. An accident information storage unit capable of storing a plurality of accident information received by the accident information reception unit;
Accident information selection unit that selects the accident information received first among the plurality of accident information stored in the accident information storage unit as a comparison target with the control table;
The power system stabilization system according to any one of claims 1 to 4, wherein the power system stabilization system is provided. An accident information storage unit that stores a plurality of accident information received by the accident information reception unit,
The control table contains information on the severity of each accident type,
Based on the control table, an accident type comparison unit that compares the severity of the accident type in the accident information received before and the accident type in the accident information received later,
After selecting the accident information received first from the plurality of pieces of accident information stored in the accident information storage unit as a comparison target with the control table, the accident in the accident information previously received by the accident type comparison unit Each time it is determined that it is severer than the type, an accident information selection unit that selects the accident information including the accident type determined to be severe, as a comparison target with the control table,
The power system stabilization system according to any one of claims 1 to 5, wherein: A computer or electronic circuit
For each of a plurality of accident types, for each of a plurality of detection information having different accident detection timing, a control table storage process for storing a control table in which the control content necessary for maintaining the stability of the power system is stored,
Accident information acceptance processing that accepts input of accident information including detection information and accident type when a grid accident occurs,
A collation process for collating the accident information received by the accident information reception process with the control table stored by the control table storage process,
Control content selection processing for selecting the control content in the control table based on the verification result by the verification processing;
The power system stabilization method characterized by performing. On the computer,
For each of a plurality of accident types, for each of a plurality of detection information having different accident detection timing, a control table storage process for storing a control table in which the control content necessary for maintaining the stability of the power system is stored,
Accident information acceptance processing that accepts input of accident information including detection information and accident type when a grid accident occurs,
A collation process for collating the accident information received by the accident information reception process with the control table stored by the control table storage process,
Control content selection processing for selecting the control content in the control table based on the verification result by the verification processing;
A power system stabilization program characterized by causing

Images