JP6223832B2 - System stabilization system, protective relay device, system stabilization method, and system stabilization program - Google Patents

Description

  Embodiments of the present invention relate to a system stabilization technique 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.

  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 has changed significantly due to the occurrence of a major accident such as a delay in the accident elimination due to circuit breaker malfunction, wide-range accident interruption, route interruption accident, etc. There is a case. In such a case, there is a possibility that an abnormal phenomenon of the system may occur due to a sudden change in tidal current, a significant supply-demand imbalance, and the like. If this is left unattended, it is assumed that the abnormal phenomenon that occurs will 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 system stabilization system or a system stabilization device (hereinafter referred to as a system stabilization system).

  Various types of system stabilization systems have been developed according to the target abnormal phenomenon (step-out phenomenon, frequency abnormality, voltage abnormality, overload, etc.). An example of such a system stabilization system is a system that prevents the generator from stepping out (a step-out prevention relay system).

  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 system stabilization system for other abnormal phenomena (frequency abnormality, voltage abnormality, overload) is basically the same as the step-out prevention relay system.

  When such a system stabilization system is classified by the calculation method of the control content, it is roughly classified into two types: (A) a post-operation type and (B) a pre-operation 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 method in which the control table is determined in advance by repeatedly performing detailed stability calculations offline in advance for an assumed accident or system state.

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

  The control table is a table in which the generator to be shut off is set according to the assumed accident type. By preparing this control table, when an accident occurs, it is possible to determine a control generator that is a generator to be shut down as a control content by comparing the type of the accident that has occurred 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.

Japanese Patent No. 3350265

  As described above, the online pre-calculation system uses the online data indicating the current system state to calculate the stability when an assumed accident occurs and obtains the control content. For this reason, quick stabilization control corresponding to the change of the system configuration and the operation state is possible. In addition, the stability calculation is an enormous amount of pre-simulation, but since all the calculations are performed by the central processing unit (representative device), there is an advantage that the burden on the human system is small.

  However, in order to perform such an enormous amount of calculations, the hard volume of the central processing unit becomes large and the cost increases. Moreover, since the amount of calculation increases as the target system increases, this problem increases. In order to cope with this, at present, the hard volume is suppressed and the number of calculation cases, which is the number of accident cases to be calculated, is reduced. However, if the number of calculation cases is reduced, the accuracy of the stability calculation is not ensured, and the control content may not be sufficient for handling accidents.

  Embodiments of the present invention have been proposed to solve the above-described problems of the prior art. The purpose of the present invention is to effectively utilize the calculation capability of the entire system, thereby achieving the same number of calculation cases. Even so, an object of the present invention is to provide a system stabilization technique capable of sufficiently executing the number of calculation cases even if the hard volume of a specific device is suppressed or the hard volumes of the devices are equal.

An embodiment for achieving the above object is a system stabilization system having the following configuration.
(a) grid information collection means for collecting the grid connection status and power supply and demand status as grid information;
(b) based on the system information collected by the system information collection means and the system facility data stored in advance, a system model creation means for creating an analysis system model representing the current power flow state;
(c) analysis condition setting means for setting a plurality of analysis conditions based on a system model for analysis created by the system model creation means and a plurality of assumed accident type data stored in advance;
(d) Perform transient stability calculation according to each analysis condition set by the analysis condition setting means, determine the stability of the power system for each analysis condition, and when each assumed accident type occurs, Stability determination means for setting a control generator necessary for maintaining stability as a control table;
(e) Accident type detection means for detecting and detecting the type of the accident with the start condition being an accident in the power system,
(f) a control generator determining means for determining a control generator by comparing the detected accident type with the control table;
(g) control means for outputting a shut-off command for disconnecting the power generator determined by the power generator determination means from the power system;
Have
(h) A part or all of at least one of the system model creation means, the analysis condition setting means, and the stability determination means, an accident detection terminal device having the accident type detection means, and the control generator determination At least one type of device including a computing device having means, a control terminal device having the control means, a protective relay device for disconnecting the control generator in response to the shut-off command, and a measurement terminal device for measuring system information .

  Note that this embodiment can also be understood as a method for realizing the above functions by a computer or an electronic circuit and a program executed by the computer. In addition, the control terminal device having the control means includes the control generator determining means. The system stabilization system, the accident detection terminal device in the above aspect, and the protective relay device are also one aspect of this embodiment.

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 embodiment A block diagram showing an example of composition of a 2nd embodiment. Simplified diagram of the system subject to the system model A block diagram showing an example of composition of a 3rd embodiment A block diagram showing an example of composition of a 4th embodiment A block diagram showing an example of composition of a 5th embodiment A block diagram showing an example of composition of a 6th embodiment A block diagram showing an example of composition of a 7th embodiment

[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 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, 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), 5 is a current measuring device (CT), and 6 is a voltage measurement. VT, 7 is a load, and 8 is a communication facility.

  As shown in FIGS. 1 and 2, the system stabilization system S of the present embodiment includes a central processing unit 9, a processing unit 10, an accident detection terminal device 11, and a control terminal device 12. 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 and receive information to and from each other via a communication facility 8 including a signal line and a transmission / reception unit. In the following description, transmission may be referred to as transmission and output, and reception may be referred to as input.

  Note that information transmitted and received in the present embodiment is managed with detection time, generation processing, transmission / reception processing, storage processing, and the like with time by managing transmission delay time or adding a time stamp to transmission data. Thereby, it is comprised so that the timing of each process can be grasped | ascertained.

  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 central 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 a computing device 10 may be installed in the same place as the accident detection terminal device 11 or the control terminal device 12, for example.

  The accident detection terminal device 11 is connected to the circuit breaker 4, the current measuring device 5, the voltage measuring device 6 and the like in the power transmission system, for example, as shown in FIG. Such an accident detection terminal device 9 is often installed in, 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. That is, each device has a function as an arithmetic device including a so-called microcomputer. The above program realizes the processing of each means and each part as described below by physically utilizing the hardware.

  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 dedicated electronic circuit that implements each process.

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

[2-1. System information collection means]
The system information collecting unit 101 includes a system information collecting unit 101a that collects the connection state of the power system and the power supply / demand state as system information at regular intervals via the power supply information network N2. The connection state of the power system includes, for example, the connection state of the power transmission line and the open / close state of the circuit breaker, disconnector, 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 line, transformer active and reactive power flow, etc. .

[2-2. System model creation means]
The system model creating unit 102 is a processing unit that creates an analysis system model representing the current power flow state based on the system information collected by the system information collecting unit 101 and the system facility data stored in advance. .

  In order to realize this processing, the system model creation unit 102 includes a system information storage unit 102a, a system facility storage unit 102b, and a system model creation unit 102c. The system information storage unit 102a is a processing unit that stores the system information collected by the system information collection unit 101a. The system facility storage unit 102b is a processing unit that stores system facility data such as power transmission lines, transformer impedance, and generator constants. The system model creation unit 102c uses the system information stored in the system information storage unit 102a and the transmission line impedance and the generator constants stored in the system facility storage unit 102b to generate an analysis system model. A processing unit to be created.

[2-3. Analysis condition setting means]
The analysis condition setting unit 103A 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 processing, the analysis condition setting unit 103A includes a system model storage unit 103a, an assumed accident type storage unit 103b, an analysis condition setting unit 103c, 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 analysis condition setting unit 103c is a processing unit that sets a plurality of analysis conditions based on the analysis system model, assumed accident type data, and the like. The analysis conditions in the present embodiment include, for example, a plurality of combinations of electric generators for a plurality of assumed accident type data.

[2-4. Stability determination means]
The stability determination means 104A 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 104A 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 104a is a storage unit that stores each analysis condition set by the analysis condition setting unit 103A. 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.

  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.

[3. Arithmetic unit]
The arithmetic device 10 includes a control generator determining unit 105 and the like. The electric generator determination means 105 is a processing unit that determines an electric generator according to the detected accident information. In order to realize this processing, the electric power generator determination unit 105 includes a control table storage unit 105a, a verification processing unit 105b, and the like.

  The control table storage unit 105a is a storage unit that stores the control table set in the stability determination unit 104A. The collation processing unit 105b is a processing unit that collates with the control table for the accident type detected by the accident type detection unit 106.

[4. Accident detection terminal device]
The accident detection terminal device 11 includes an accident type detection unit 106, an analysis condition setting unit 103B, a stability determination unit 104B, and the like. The accident type detection means 106 is a processing unit that detects that an accident has occurred by determining the accident type for each piece of accident detection information using an occurrence of an accident in the power system as a starting condition.

  The analysis condition setting unit 103B and the stability determination unit 104B have the same functions as the analysis condition setting unit 103A and the stability determination unit 104A. In addition, the assumed accident case which each accident detection terminal device 11 takes charge may be preset in the assumed accident type storage unit 103b of the analysis condition setting unit 103B.

[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 limitation in accordance with the control content determined by the control generator 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 the drawings for each of the above devices, in addition to the storage unit explicitly shown above, various information necessary for processing of the system stabilization system S such as information transmitted / received, detected, generated, etc. in each device The memory | storage part which memorize | stores this information is comprised. The information stored in the storage unit includes each means, an arithmetic expression for processing of each unit, a reference value including parameters, 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 performs input of information necessary for the system stabilization system S, selection of processing, instruction, and the like. As the input unit, for example, a switch, a touch panel, a keyboard, a mouse, and the like can be considered. 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 is a component that outputs information to be processed in the 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. is there. 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]
Prior to the occurrence of an accident, online system information is collected by the system information collection means 101 in the central processing unit 9. The system model creation means 102 performs state estimation calculation and power flow calculation based on the online system information and pre-stored system facility data, and creates a system model for analysis representing the current power flow state.

  The analysis system model created in this way is transmitted from the central processing unit 9 to one or more accident detection terminal devices 11. The analysis condition setting means 103B in the accident detection terminal device 11 sets a plurality of analysis conditions based on the transmitted analysis system model and a plurality of assumed accident type data. That is, a plurality of combinations of electric generators are set for the accident type data of the assumed accident.

  The stability determination means 104B performs transient stability calculation based on the analysis conditions, determines the stability of the power system with respect to each analysis condition, and determines the control generator for the control contents for each assumed accident type in the control table. Set as.

  The accident detection terminal device 11 transmits the set control table to the arithmetic device 10. The control table storage unit 105a of the arithmetic device 10 stores and updates the transmitted control table.

  Arithmetic processing for setting the control table can be performed by the analysis condition setting means 103A and the stability determination means 104A in the central processing unit 9, but part or all of them can be performed by one or more accidents as described above. It can also be performed in the detection terminal device 11. It is possible to freely set which range of calculation processing the accident detection terminal device 11 and the central processing unit 9 share.

  A plurality of accident detection terminal devices 11 in each accident detection terminal device 11 may share the entire calculation, and the result may be returned to the central processing device 9. The calculation to be shared may be randomly divided or may be divided for each specific area and each transmission line accident. Each accident detection terminal device 11 may perform only the calculation for the accident each of which is responsible for.

  Note that the system information changes every moment, and accordingly, the appropriate control amount also changes. For this reason, the pre-computation process performed by the accident detection terminal device 11 and the central processing unit 9 is performed at regular intervals. This period is determined by the system scale handled by the system, the number of assumed accident types, the processing capacity of the accident detection terminal device 11 and the central processing unit 9, the update period of the online power supply data, and the like. As described above, information collected, set, calculated, determined, stored, and the like in the system information collection unit 101, the system model creation unit 102, the analysis condition setting units 103A and 103B, and the stability determination units 104A and 104B is also predetermined. It is assumed that it is updated after waiting for the input of the period or necessary information. Therefore, the optimal control table is always set.

[2. Accident detection]
When a system fault occurs, the accident type detection unit 106 determines and detects the type of the accident based on the system information, and outputs the accident type to the arithmetic device 10. In the arithmetic unit 10, the detected accident type is compared with the control table that records the electric generator for each set assumed accident type, the electric generator is determined, and in the control terminal device 12, The determined generator is disconnected from the power grid.

[effect]
According to the present embodiment as described above, the computing ability of the accident detection terminal device 11 can be effectively utilized. Previously, many microcomputers of the accident detection terminal device 11 existed in the system and processed information such as the current from the CT, the voltage from the PT, and the operation signal from the switch even though the individual computing power was high. It was about to do.

  In the present embodiment, a large number of accident detection terminal devices 11 existing in the system share the calculation of analysis condition setting and stability determination, thereby reducing the hard volume of the central processing unit 9 compared to the conventional case, Cost can be reduced. Even when the hard volume of the conventional central processing unit 9 is maintained, many calculation cases can be executed without saving the number of calculation cases, and an accurate accident response can be realized.

[Second Embodiment]
[Constitution]
This embodiment is basically the same configuration as the first embodiment. However, in the present embodiment, as shown in FIG. 3, the accident detection terminal device 11 includes a system information collection unit 101B, similar to the system information collection unit 101A of the central processing unit 9. And the accident detection terminal device 11 has the 1st system model preparation means 102-1 and the central processing unit 9 has the 2nd system model preparation means 102-2.

  The first system model creation means 102-1 has the same system information storage unit 102a and system facility storage unit 102b as in the first embodiment. Furthermore, in this embodiment, the 1st system | strain model preparation means 102-1 has the system | strain information file preparation part 102c1 which produces a system | strain information file.

  As shown in FIG. 4, the system information file includes system information stored in the system information storage unit 102a, various constants including the impedance of the power transmission line stored in the system facility storage unit 102b, and various constants of the generator. This is a model for determining the characteristics of the system as a static circuit determined in advance.

  Since this system information file is a model showing the state as a static circuit, as shown in the part surrounded by the broken line in FIG. You can also That is, the system information file creation unit 102c1 in the plurality of accident detection terminal devices 11 can create a partial system information file to which each is assigned.

  The second system model creation means 102-2 has an analysis system model creation unit 102c2. The analysis system model creation unit 102c2 uses, as an analysis system model, the result of power flow calculation when a current based on the current amount of electricity flows through the system using the entire system information file including the partial system information file. A processing unit to be created. As described above, the analysis system model indicates a dynamic power flow situation in the system, and therefore needs to be obtained as a state of the entire system, not a part.

  The system information collection unit 101B is a processing unit that collects system information necessary for the first system model creation unit 102-1.

[Action]
The operation of the present embodiment having the above configuration will be described. The basic operation is the same as that of the first embodiment. However, in the present embodiment, based on the system information collected by the system information collection unit 101B in each accident detection terminal device 11, the system information file creation unit 102c1 of the first system model creation unit 102-1 is a partial system. Create an information file.

  In each accident detection terminal device 11, the partial system information file in charge of each is transmitted to the central processing unit 9. The analysis system model creation unit 102c2 in the second system model creation unit 102-2 of the central processing unit 9 creates an analysis system model using the collected partial system information file.

[effect]
According to the present embodiment as described above, the same effects as those of the first embodiment described above can be obtained, and a system information file suitable for sharing a plurality of information is created in each accident detection terminal device 11, and the entire system is created. By creating a system model for analysis suitable for general calculation in the central processing unit 9, efficient processing becomes possible.

[Third Embodiment]
[Constitution]
This embodiment is basically the same configuration as the first embodiment. However, in this embodiment, as shown in FIG. 5, the accident detection terminal apparatus 11 has the 2nd system | strain model preparation means 102-2 in 2nd Embodiment.

  On the other hand, the central processing unit 9 includes first system model creation means 102-1 in the second embodiment. The first system model creation unit 102-1 includes an analysis system model creation unit 102c2 together with the system information file creation unit 102c1.

[Action]
The operation of the present embodiment having the above configuration will be described. The basic operation is the same as that of the first embodiment. However, in this embodiment, based on the system information collected by the system information collection unit 101 in the central processing unit 9, the system information file creation unit 102c1 in the first system model creation unit 102-1 stores the system information file. create.

  The system information file created in the central processing unit 9 is transmitted to each accident detection terminal device 11. The analysis system model creation unit 102c2 in the second system model creation means 102-2 of each accident detection terminal device 11 creates an analysis system model using the transmitted system information file.

[effect]
According to the present embodiment as described above, the information transmitted from the central processing unit 9 to the accident detection terminal device 11 is not a system model for analysis but a system information file. The system information file has a smaller amount of information than the system model for analysis. For this reason, the amount of transmission can be reduced and the traffic load can be reduced.

  The analysis system model is usually calculated in one place and does not change depending on the accident point. Therefore, each accident detection terminal device 11 performs redundant calculation.

  However, since the analysis system model is added with information on the current voltage flowing to the circuit as described above, the amount of data becomes very large. For this reason, it is possible to reduce the transmission load by calculating and calculating inside each accident detection terminal device 11 rather than transmitting via the communication equipment 8. Even if the calculations are duplicated, the transmission load can be reduced by holding the result calculated by each accident detection terminal device 11 itself. On the other hand, since the system information file has a small amount of data, it has little influence on traffic even if it is transmitted.

[Fourth Embodiment]
[Constitution]
This embodiment is basically the same configuration as the first embodiment. However, in the present embodiment, as shown in FIG. 6, the accident detection terminal device 11 is a device that only includes the accident type detection means 106 as a basic function. The control terminal device 12 includes a control generator determination unit 105.

  That is, in the first embodiment, the arithmetic device 10 has the control generator determination means 105, determines the control generator based on the control table, and transmits it to the control terminal device 12. In the present embodiment, the control terminal device 12 has a function of determining a control generator and outputting a cutoff command.

[Action]
The operation of the present embodiment having the above configuration will be described. The basic operation is the same as that of the first embodiment. However, in the present embodiment, the control table created in the central processing unit 9 is transmitted to all the control terminal devices 12.

  On the other hand, the accident detection terminal device 11 transmits the detected accident type to the control terminal device 12 via the central processing unit 9. In the control terminal device 12, the collation processing unit 105b collates the transmitted accident type with the control table stored in the control table storage unit 105a, and determines the electric generator set for each accident case. To do. Furthermore, the control means 107 outputs the determined control generator cutoff command.

[effect]
In the present embodiment as described above, the arithmetic device 10 does not need to have the control table storage unit 105a and the verification processing unit 105b necessary for the electric power generator determination unit 105. For this reason, it is possible to reduce the hardware volume of the arithmetic device 10 and save costs.

[Fifth Embodiment]
[Constitution]
This embodiment is basically the same configuration as the above-described fourth embodiment. However, in the present embodiment, as shown in FIG. 7, a transmission path from the accident detection terminal device 11 to each control terminal device 12 that does not pass through the central processing unit 9 is provided.

[Action]
In the present embodiment having the above-described configuration, when the accident detection terminal device 11 detects an accident, the accident type is transmitted to all the control terminal devices 12 without going through the central processing unit 9.

[effect]
According to the present embodiment as described above, the number of devices that pass through the route to be transmitted is reduced compared to the case where the accident types are collected once in the central processing unit 9 and transmitted after the accident. Can be fast.

[Sixth Embodiment]
[Constitution]
This embodiment is basically the same configuration as the first embodiment. However, in this embodiment, as shown in FIG. 8, the central processing unit 9 has a calculation case management unit 109. The calculation case management unit 109 includes a calculation case management unit 109 a that distributes calculation cases in the accident detection terminal device 11.

  The calculation case management unit 109a receives information related to calculation from each accident detection terminal device 11, and changes the distribution of contents to be dynamically calculated within the range allowed by the calculation processing capability of each accident detection terminal device 11. Part.

  Calculation case distribution by the calculation case management unit 109a is performed based on the calculation time of each calculation case measured by the calculation time measuring unit 108a so that the difference in calculation volume in each accident detection terminal device 11 is reduced.

  Further, the accident detection terminal device 11 and the central processing unit 9 have a calculation case changing unit 108. The calculation case changing unit 108 includes a calculation time measuring unit 108a and a calculation case storage unit 108b.

  The calculation time measurement unit 108a is a processing unit that measures the calculation time for setting the analysis conditions and determining the stability of the accident detection terminal device 11. The calculation case storage unit 108b is a processing unit that stores calculation cases.

[Action]
The operation of the present embodiment having the above configuration will be described. The basic operation is the same as that of the first embodiment. However, in this embodiment, the calculation time for the analysis condition setting and the stability determination of the accident detection terminal device 11 measured by the calculation time measuring unit 108a is transmitted to the central processing unit 9.

  The calculation case management means 109 in the central processing unit 9 manages the transmitted calculation time. That is, the distribution of calculation cases in charge of each accident detection terminal device 11 is determined so that the difference in calculation time of each accident detection terminal device 11 is reduced, and the calculation cases are transmitted to each accident detection terminal device 11.

  For example, suppose that it takes 5 seconds to calculate per calculation case. Since a certain accident detection terminal device 11 has only to calculate three accidents A, B, and C, the calculation takes 15 seconds. Assuming that the timing for creating and updating the control table is once every 30 seconds, after calculating the control table for 15 seconds, it becomes an idle time and the load becomes small.

  On the other hand, in the other accident detection terminal apparatus 11, it is assumed that there are many calculation cases such as A, B, C, D, E. Then, this accident detection terminal device 11 has a long calculation time and a large load. In such a case, the calculation case of the accident detection terminal device 11 having a large load is assigned to the accident detection terminal device 11 having a small load so that the load of each accident detection terminal device 11 approaches equality.

  The calculation of the accident calculates whether it is stable when the first generator is shut off, and if insufficient, calculates whether it is stable when the second generator is shut off. If it is sufficient, it is calculated whether it is stable when the third generator is shut off, and so on. For this reason, the more severe the accident conditions, the longer the calculation takes, and it is necessary to reduce the load on the accident detection terminal device 11.

[effect]
In the present embodiment as described above, the content to be calculated can be dynamically changed within the range allowed by the calculation processing capability of each accident detection terminal device 11. Thereby, the load of the accident detection terminal device 11 is made uniform, and it is prevented that the load of the specific accident detection terminal device 11 becomes excessive and delays in the entire processing.

[Seventh Embodiment]
[Constitution]
The present embodiment is applied to a protective relay device that protects a system. For example, as shown in FIG. 9, it is assumed that a power transmission line protection relay device A21, a power transmission line protection relay device B22, and a bus protection relay device 23 are provided in the system. The transmission line protection relay device A21 has a target accident protection range of the transmission line 20A. In the power transmission line protection relay device B22, the target accident protection range is the power transmission line 20B. The protection range of the target accident of the busbar protection relay device 23 is the busbar 20C.

  The central processing unit 9 includes a system information collecting unit 101, a system model creating unit 102, an analysis condition setting unit 103A, and a stability determining unit 104A, as in the above embodiment. Have

  The power transmission line protection relay device A21 includes an accident type detection unit 106, an analysis condition setting unit 103B, and a stability determination unit 104B. The busbar protection relay device 23 includes an accident type detection unit 106. The power transmission line protection device B22 includes a control unit 107.

[Action]
The operation of the present embodiment having the above configuration will be described. First, in the central processing unit 9, an analysis system model is created and transmitted to the transmission line protection relay device A21 having the analysis condition setting means 103B and the stability determination means 104B.

  In the power transmission line protection relay device A21, a control table is created by the analysis condition setting unit 103B and the stability determination unit 104B using the transmitted analysis system model, and transmitted to the central processing unit 9.

  The power transmission line protection relay device A21 and the bus protection relay device 23 transmit the accident type detected by the accident type detection means 106 to the central processing unit 9. The central processing unit 9 uses the control table received from the power transmission line protection relay device A21 in advance and the accident type received from the power transmission line protection relay device A21 or the bus protection relay device 23 afterwards. The control generator determining means 105 determines the control generator and transmits the control generator to the transmission line protection relay device B22. A cutoff command is output to the circuit breaker 4 from the power line protection relay device B22 that has received the control generator.

[effect]
In the present embodiment as described above, by effectively utilizing the calculation capability of the protective relay devices existing in large numbers in the system, the dedicated system stabilization system such as the central processing unit 9 is dedicated as in the above embodiment. The hard volume of the device can be reduced. Since the protective relay device has an accident type detection function in the first place, the device can be simplified as a whole by using this as the accident type detection means 106.

[Other Embodiments]
This embodiment is not limited to the above aspects.
(1) The effect of this embodiment can be obtained by sharing the computing ability with one or more of the accident detection terminal device, the control terminal device, the protective relay device, and the measurement terminal device.

  For example, in the above-described embodiment, even if the analysis condition setting means and the stability determination means are arranged in part or all of the control terminal device, the calculation capability of the control terminal device can be effectively utilized, as described above. The effect is obtained.

  Further, the system information can be received not from the power supply information network but from the measurement terminal device having the measurement means. In that case, even if the analysis condition setting means and the stability determination means are arranged in the measurement terminal device, the calculation capability of the measurement terminal can be used effectively, and the same effect as described above can be obtained.

(2) System information collection means, system model creation means (including the case where the first system model creation means and the second system model creation means are used), analysis condition setting means, and stability determination means are all accident detection terminals. The central processing unit 9 can be made unnecessary by providing any one of the device, the processing device, the control terminal device, the protective relay device, and the measurement terminal device or by dispersing them.

(3) The control table transmitted to the control terminal device may transmit only the control table corresponding to the control target controlled by each control terminal device. Thereby, the transmission amount can be reduced, and the control table can be stored with a small hard volume of each control terminal device.

(4) The accident detection terminal device does not necessarily have to transmit the accident type to all control terminal devices. The speed of processing and transmission may be increased by transmitting the accident type only to the control terminal device set in advance. For example, when the accident detection terminal device calculates only the accident for which it is in charge, the accident type may be transmitted to the corresponding control terminal device 12.

(5) The calculation case management means defaults when the accident detection terminal device 11 having a large load and the accident detection terminal device having a small load can be specified in advance from the configuration of the system having many transmission lines or few transmission lines. It is also possible to share the calculation cases so that the load is close to equality.

(6) The calculation case management means may be one of an accident detection terminal device, a control terminal device, a protective relay device, and a measurement terminal device instead of the central processing device. Further, only when there is a device whose calculation time exceeds a predetermined threshold value, the calculation case may be changed to reduce the processing load.

(7) Since the protective relay device may be in an OFF state, the same applies to other protective relay devices, arithmetic devices, control terminal devices, accident detection terminal devices, measurement terminal devices, and central arithmetic devices. A backup machine having the above function may be set in advance.

(8) 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.

(9) A network as a communication facility widely includes a transmission path (transmission line) 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.

(10) The calculation method for system model creation, analysis condition setting, stability determination, etc. is not limited to a specific one, and includes any method that can be used now 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.

(11) 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.

S ... System stabilization system 1 ... Generator 2 ... Bus 3 ... Transmission line or transformer 4 ... 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 units 20A, 20B, 20C ... Transmission lines 21, 22 ... Transmission line protection relay device 23 ... Bus protection relay device 101 ... system information collecting means 101a ... system information collecting unit 102 ... system model creating means 102-1 ... first system model creating means 102-2 ... second system model creating means 102a ... system information storage Unit 102b ... system facility storage unit 102c ... system model creation unit 102c1 ... system information file creation unit 102c2 ... analysis system model creation unit 103A, 103B ... analysis condition setting means 103a ... system model storage unit 103b ... expected accident type storage unit 103c ... Analysis condition setting unit 104A, 104B ... Stability determination means 104a ... Analysis condition storage unit 104b ... Transient stability Degree calculation unit 104c ... Stability determination unit 104d ... Control table setting unit 105 ... Electric power generator determination means 105a ... Control table storage unit 105b ... Collation processing unit 106 ... Accident type detection means 107 ... Control means 108 ... Calculation case change means 108a ... calculation time measuring unit 108b ... calculation case storage unit 109 ... calculation case management means 109a ... calculation case management unit

Claims (6)

Grid information collecting means for collecting the grid connection status and power supply and demand status as grid information;
Based on the system information collected by the system information collection means and system facility data stored in advance, system model creation means for creating a system model for analysis representing the current power flow state,
Analysis condition setting means for setting a plurality of analysis conditions based on a plurality of assumed accident type data stored in advance and an analysis system model created by the system model creation means;
Perform transient stability calculation according to each analysis condition set by the analysis condition setting means, determine the stability of the power system for each analysis condition, and maintain the stability of the power system when each assumed accident type occurs A stability determination means for setting a control generator necessary for the control table as a control table;
Accident type detection means for determining and detecting the type of the accident, based on the fact that an accident has occurred in the power system,
Checking the detected accident type and the control table, a control generator determining means for determining a control generator;
Control means for outputting a shut-off command for disconnecting the electric power generator determined by the electric power generator determination means from the electric power system;
Have
A part or all of at least one of the system model creation means, the analysis condition setting means, and the stability determination means includes an accident detection terminal device having the accident type detection means, and the electric power generator determination means. computing device, the control terminal having the control means, at least one device for measuring the terminal device for measuring the protective relay device and system information performs disconnection of the electronically controlled generator according to the disconnection command is Yes,
The system model creation means includes:
A system information file creation unit for creating a system information file indicating a system state as a static circuit;
An analysis system model creation unit that creates a system model for analysis indicating a result of dynamic tidal current calculation of the system in the system information file;
Have
The central processing unit having the system information collecting means, the accident detection terminal device, the arithmetic device, the control terminal device, the protection relay device, and the measurement terminal device, and any two types via communication equipment One of the devices connected to each other has one of the system information file creation units, and the other has the analysis system model creation unit . The analysis condition setting means and apparatus having the stability judging means, the system stabilizing system according to claim 1, characterized by having the solution 析系 integrated modeling unit. As the difference in computation time is reduced in a plurality of devices having the analysis condition setting means and the stability judging means, according to claim 1 or 2, characterized in that an arithmetic case management means for sharing the processing System stabilization system. A protective relay device that disconnects the control generator in response to a shutoff command,
Accident type detection means for determining and detecting the type of the accident, based on the fact that an accident has occurred in the power system,
A system model creating means for creating a system model for analysis representing a current power flow state based on system information collected from the power system and system facility data stored in advance;
Analysis condition setting means for setting a plurality of analysis conditions based on a plurality of assumed accident type data stored in advance and an analysis system model created by the system model creation means;
Perform transient stability calculation according to each analysis condition set by the analysis condition setting means, determine the stability of the power system for each analysis condition, and maintain the stability of the power system when each assumed accident type occurs A stability determination means for setting a control generator necessary for the control table as a control table;
Control means for outputting a shut-off command for disconnecting the electric power generator determined by the external electric power generator determination means from the power system;
A protective relay device comprising a part or all of at least one of the following means. A computer or electronic circuit
System information collection processing for collecting power system connection status and power supply and demand status as system information,
Based on the system information collected by the system information collection process and the system facility data stored in advance, a system model creation process for creating an analysis system model representing the current power flow state,
An analysis condition setting process for setting a plurality of analysis conditions based on a system model for analysis created by the system model creation process and a plurality of assumed accident type data stored in advance,
Perform transient stability calculation according to each analysis condition set by the analysis condition setting process, determine the stability of the power system for each analysis condition, and maintain the stability of the power system when each assumed accident type occurs Stability determination processing to set the control generator required for the control table,
Accident type detection processing that detects and detects the type of the accident, with the occurrence of an accident in the power system as a starting condition,
A control generator determination process for determining a control generator by comparing the detected accident type with the control table;
A control process for outputting a shut-off command for disconnecting the electric power generator determined by the electric power generator determination process from the power system;
Run
A part or all of at least one of the system model creation process, the analysis condition setting process, and the stability determination process, the accident detection terminal device that performs the accident type detection process, and the control generator determination process An arithmetic device, a control terminal device that performs the control process, a protection relay device that disconnects the control generator in response to the shut-off command, and at least one type of device that measures system information are executed ,
The system model creation process includes:
A system information file creation process for creating a system information file indicating a system state as a static circuit,
An analysis system model creation process for creating a system model for analysis indicating a result of dynamic tidal current calculation of the system in the system information file;
Including
The central processing unit having the system information collecting means, the accident detection terminal device, the arithmetic device, the control terminal device, the protection relay device, and the measurement terminal device, and any two types via communication equipment One of the apparatuses connected to each other executes the system information file creation process, and the other executes the analysis system model creation process . On the computer,
System information collection processing for collecting power system connection status and power supply and demand status as system information,
Based on the system information collected by the system information collection process and the system facility data stored in advance, a system model creation process for creating an analysis system model representing the current power flow state,
An analysis condition setting process for setting a plurality of analysis conditions based on a system model for analysis created by the system model creation process and a plurality of assumed accident type data stored in advance,
Perform transient stability calculation according to each analysis condition set by the analysis condition setting process, determine the stability of the power system for each analysis condition, and maintain the stability of the power system when each assumed accident type occurs Stability determination processing to set the control generator required for the control table,
Accident type detection processing that detects and detects the type of the accident, with the occurrence of an accident in the power system as a starting condition,
A control generator determination process for determining a control generator by comparing the detected accident type with the control table;
A control process for outputting a shut-off command for disconnecting the electric power generator determined by the electric power generator determination process from the power system;
And execute
A part or all of at least one of the system model creation process, the analysis condition setting process, and the stability determination process, the accident detection terminal device that performs the accident type detection process, and the control generator determination process An arithmetic device, a control terminal device that performs the control process, a protective relay device that disconnects the control generator in response to the shut-off command, and at least one device of a measurement terminal device that measures system information are executed ,
The system model creation process includes:
A system information file creation process for creating a system information file indicating a system state as a static circuit,
An analysis system model creation process for creating a system model for analysis indicating a result of dynamic tidal current calculation of the system in the system information file;
Including
The central processing unit having the system information collecting means, the accident detection terminal device, the arithmetic device, the control terminal device, the protection relay device, and the measurement terminal device, and any two types via communication equipment connected devices with each other, one to execute the system information file creation process, the system stabilizing program characterized Rukoto allowed the other execute the analysis system model creation process.

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