JP2013059217A - System and method for stabilizing electric power system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an online previous-arithmetic type system and method for stabilizing electric power system, capable of executing appropriate control to a current system state by immediately reflecting an established result of an electric motor into the control.SOLUTION: A central processing unit 9, when there is an assumed accident where stability determination, electric control device selection and electric control device setting to a control table have been completed, transmits a result of the electric control device setting or a control table showing the result to an arithmetic unit 10 without waiting for processing completion of other assumed accidents.

Description

  Embodiments described herein relate generally to a power system stabilization system and a power system stabilization method.

  When an accident such as a lightning strike occurs in the power system, the accident elimination relay system removes the accident at a high speed and in the minimum range, and the influence on the system is minimized. However, despite the operation of the accident elimination relay system, the system configuration after the accident elimination due to the occurrence of a major accident such as a delay in accident elimination due to circuit breaker malfunction, wide-range accident interruption, route interruption accident, etc. In the case of a drastic change, an abnormal phenomenon of the system may occur due to a sudden change in the tidal current and a significant imbalance in supply and demand. If this is left unattended, an abnormal phenomenon that occurs may spread to the entire power system and spread to a major power outage.Therefore, the occurrence of such an abnormal phenomenon or the spread of the entire system can be prevented. There is a relay system to prevent accidents.

  Accident Ripple Prevention Relay System, commonly known as a power system stabilization system or power system stabilization device, varies depending on the abnormal phenomenon (step out phenomenon, frequency abnormality, voltage abnormality, overload) in the target power system. There are various types.

  Hereinafter, in order to simplify the explanation, an out-of-step prevention relay system that prevents the occurrence of a step-out phenomenon between the generator and the system will be described as an example of the power system stabilization system. The same can be said for the power system stabilization system for other abnormal phenomena (frequency abnormality, voltage abnormality, overload).

  When the power system stabilization system is classified by the calculation method of the control content, it is roughly classified into two types, a pre-calculation type and a post-calculation type.

  The post-operation type is a method for performing control by performing prediction calculation on future phenomena using system information during and after an accident, and calculating a control amount of a controlled generator based on the result.

  On the other hand, the pre-calculation type assumes that accidents and system phenomena are assumed, and the control amount is calculated and set in advance using system information before the accident. This is the method to be implemented. Further, the pre-calculation type is classified into an offline pre-calculation type and an online pre-calculation type. The pre-operation type is sometimes called a phenomenon assumption type.

  The offline precomputation type determines the control table based on the offline detailed stability calculation, while the online precomputation type performs control by performing detailed stability calculation using the system information (online data) obtained online. The difference is that the table is created, but the control contents are calculated and determined in advance for the assumed system fault type, the result is stored as a control table, and control is performed by comparing the fault type with the control table when an accident occurs. The point of determining the contents is common. A feature of the online pre-calculation type is that a control table is created using online data, so that stabilization control corresponding to the current system configuration and operation state is possible.

JP-A-9-56069 JP 7-298498 A

IEEJ Technical Report No. 801 “Relaying System and Accident Prevention Relay Technology”, The Institute of Electrical Engineers of Japan, October 2000, p5, p6, p52, p54, p55, p85, p87, p88, p89

  The conventional online pre-calculation type power system stabilization system calculates the setting result (control table) of the electric controller after completing the stability determination, electric device selection, and setting for all possible accidents in the central processing unit. Sending to the device. In other words, the transmission of the control table from the central processing unit to the processing unit is not performed until the setting of the control unit for all possible accidents is completed. There is a problem that it takes a long time to be reflected.

  The problem to be solved by the invention is that an on-line pre-calculation type power system stabilization system that makes it possible to immediately reflect the setting result of the electric controller in the control and perform appropriate control according to the current system state, and It is to provide a power system stabilization method.

  The power system stabilization system according to the embodiment creates a system model for analysis based on the current connection state and supply / demand state of the power system and system facility data stored in advance, and each analysis condition of a plurality of assumed accident data A central processing unit that determines the control system necessary for maintaining the stability of the power system when each assumed accident occurs, and the fact that an accident has occurred in the power system. Accident detection terminal device that determines and detects the type of the accident as a starting condition, an arithmetic device that determines the electric control device by comparing the detected accident type with the control table, and the electric power controller determined by this arithmetic device In an online pre-computation type power system stabilization system comprising a control terminal device disconnected from the system, stability determination, control device selection, and control device setting in the control table If there is assumed accident been completed, without waiting for completion of processing of other postulated accident, and transmits a control table that indicates the arithmetic unit to the electrically controlled machine setting result from said central processing unit.

The figure which shows an example of a structure of the system | strain stabilization system which concerns on 1st Embodiment. The figure which shows an example of installation of each apparatus which comprises the system | strain stabilization system which concerns on the same embodiment. The figure which shows an example of the control table used with the system | strain stabilization system which concerns on the same embodiment. The flowchart which shows operation | movement of the system | strain stabilization system which concerns on the same embodiment. The time chart which shows the update timing of the control table used with the system | strain stabilization system which concerns on the same embodiment. The time chart which shows the update timing of the control table used with the system | strain stabilization system which concerns on 2nd Embodiment. The flowchart which shows 1st operation | movement of the system | strain stabilization system which concerns on 3rd Embodiment. The flowchart which shows 2nd operation | movement of the system | strain stabilization system which concerns on the same embodiment. The flowchart which shows 2nd operation | movement of the system | strain stabilization system which concerns on 4th Embodiment.

  Hereinafter, embodiments will be described with reference to the drawings.

(First embodiment)
First, the first embodiment will be described with reference to FIGS. These drawings are also used as appropriate in second to fourth embodiments to be described later.

  FIG. 1 is a diagram illustrating an example of a configuration of a system stabilization system according to the first embodiment.

  The system stabilization system shown in FIG. 1 is an online pre-computation system stabilization system, and system information 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 N. A collection model 101, a system model creation unit 102 for creating a system model for analysis representing the current power flow state based on the system information collected by the system information collection unit 101 and the system facility data stored in advance; An analysis condition setting unit 103 for setting a plurality of analysis conditions based on a system model for analysis created by the system model creation unit 102 and a plurality of assumed accident type data stored in advance, and an analysis condition setting unit 103 Perform stability calculation according to each analysis condition set by, determine the power system stability for each analysis condition, Stability determination means 104 that sets the control equipment (generator to limit power supply) necessary for maintaining the stability of the power system when an assumed accident type occurs as a control table, and that an accident has occurred in the power system Accident type detection means 106 for determining and detecting the type of the accident, and the accident type detected by the accident type detection means 106 and the electric control device for each assumed accident type set by the stability determination means 104 are recorded as conditions. And a control unit 107 for disconnecting the electric machine determined by the electric machine determination unit 105 from the electric power system. It consists of

  Here, the analysis condition setting unit 103 includes a system model storage unit 103a that stores the system model for analysis created by the system model creation unit 102, and an assumed accident type storage that stores a plurality of assumed accident type data. A plurality of analysis conditions by changing the combination of the control units using the analysis model and the assumed accident type data stored in the unit 103b, the system model storage unit 103a, and the assumed accident type storage unit 103b, respectively. It is desirable that the analysis condition setting unit 103c to be configured.

  The stability determination means 104 is stable with respect to each analysis condition stored in the analysis condition storage section 104a and an analysis condition storage section 104a that stores each analysis condition set by the analysis condition setting means 103. The stability calculation unit 104b that performs degree calculation and the calculation result by the stability calculation unit 104b are used to determine the stability for each analysis condition and to maintain the stability of the power system when each assumed accident type occurs. It is desirable to include a stability determination unit 104c for obtaining a necessary electric control device and a control table setting unit 104d for setting a determination result of the stability determination unit 104c as a control table.

  Further, the control unit determining unit 105 collates the control table storage unit 105a for storing the control table set by the stability determining unit 104 with the accident type detected by the accident type detecting unit 106 and the control table. Thus, it is desirable to include a verification processing unit 105b for determining an electric control machine.

  The online pre-calculation type system stabilization system including the above-described means includes a central processing unit 9, a processing unit 10, an accident detection terminal unit 11, and a control terminal unit 12.

  FIG. 2 is a diagram illustrating an example of installation of each device constituting the system stabilization system according to the present embodiment.

  The central processing unit 9, the processing unit 10, the accident detection terminal unit 11, and the control terminal unit 12 are connected by a communication facility 8 such as a signal line as shown in FIG. The power system includes a generator 1, a bus 2, a transformer or power transmission line 3, a circuit breaker (CB) 4, a current measuring device (CT) 5, a voltage measuring device (PT) 6, and an accident elimination relay system 7. Exists.

  The accident detection terminal device 11 is installed at a substation, and the control terminal device 12 is installed at a power plant. The computing device 10 is installed at a location where communication with other devices is possible. It may be installed in the same place as the accident detection terminal device 11 and the control terminal device 12. Furthermore, the arithmetic device 10 may be configured to include the functions of the accident detection terminal device 11 and the control terminal device 12. The central processing unit 9 is installed at a location that can be connected to the power supply information network N such as a central power supply command station.

  FIG. 3 is a diagram illustrating an example of the control table.

  In the control table, “assumed accident number”, “assumed accident case”, and “electric control device” are provided as items. Information for identifying the type of the assumed accident (numbers 1, 2, 3,...) Is recorded in the “Assumed accident number” column. Information indicating the state of the accident (assumed accidents 1, 2, 3,...) Is recorded in the “assumed accident case” column. Information (G1, G2, G3...) Indicating the selected / set electric control device is recorded in the “electric control device” column. Note that the electric control device is not set when the stability determination result at the time of the assumed accident is stable, and one or more electric control devices are set when the result is unstable.

  In the present embodiment, the central processing unit 9 waits for completion of processing of other assumed accidents when there is an assumed accident in which stability determination, control device selection, and control device setting in the control table are completed. Instead, a control table indicating the control device setting result is transmitted to the arithmetic device 10.

  FIG. 4 shows an example of the processing flow of the online pre-calculation type power system stabilization system according to the present embodiment. FIG. 5 shows an example of a time chart showing the update timing of the control table.

  As shown in FIG. 4, the central processing unit 9 performs state estimation / system contraction using online system information and pre-stored system facility data, and represents an analysis system model representing the current power flow state. (Step S1), and based on this, the processes of steps S2 to S8 described later are performed for each assumed accident case.

  The central processing unit 9 sets the target assumed accident data in a predetermined storage area (step S2), and performs the detailed stability calculation of the target assumed accident based on the analysis system model and the assumed accident data (step S3). ) The stability determination of the power system when an accident occurs is performed (step S4). If the central processing unit 9 determines that the stability of the power system cannot be maintained (No in step S5), the central processing unit 9 calculates the control content necessary for maintaining the stability, and selects the electric controller required for maintaining the stability. If it is selected (step S6) and the process from step S3 is repeated while it is determined that the stability of the electric power system can be maintained (Yes in step S5), the electric controller is set in the control table. A control table indicating the setting result is transmitted to the arithmetic unit 10 (step S7). If the processing of all the assumed accident cases is not completed (No in Step S8), the processing from Step S2 is repeated. On the other hand, if the processing of all the assumed accident cases is completed (Yes in Step S8), the process is finished. . The central processing unit 9 repeatedly performs these series of processes (steps S1 to S8) at a constant cycle. This process enables control according to the current power system state.

  As can be seen from the above series of processes, the controller setting in the control table was completed without waiting for the detailed stability calculation, stability determination, and controller selection process for all assumed accidents to be completed. If there is an assumed accident, the control table is transmitted sequentially as shown in FIG.

The time Ts from the start of the electric controller setting to the time when the electric controller is set to the arithmetic device is approximately expressed by the equation (1).

Here, Tci: Time required for determining the stability of the assumed accident i and selecting the electric control device
n: Number of assumed accident cases
Td: Time required to transmit the control table indicating the control device setting result from the central processing unit to the processing device. Also, the time Ts1 at which the control device is set in the processing device for one assumed accident, for example, assumed accident 1, is Approximately expressed by equation (2). This time Ts1 is considerably shorter than the time for which the electric controller is set in the arithmetic unit for all the assumed accidents as in the prior art.

  According to the first embodiment, since the control table indicating the electric controller selection result calculated by the central processing unit 9 can be reflected in the processing unit 10 quickly, the stabilization control corresponding to the current system configuration and operation state can be performed. Thus, the reliability of power supply in the power system can be improved.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS.

  In the second embodiment, the description of the same parts as those in the first embodiment is omitted. Below, it demonstrates centering on a different part from 1st Embodiment.

  In the present embodiment, the central processing unit 9 sets the control table set when performing the electric controller setting and transmission for the assumed accident in which the stability determination, the electric controller selection, and the electric controller setting to the control table are completed. Instead of transmitting to the computing device 10, only the control unit setting contents of the assumed accident for which the computation has been completed in the control table are transmitted.

  FIG. 6 shows an example of a time chart showing the update timing of the control table in the present embodiment.

A time Ts from the start of the electric machine setting process to the time when the electric machine is set in the arithmetic unit is approximately expressed by the equation (3). This time Ts is shorter than the time Ts in the first embodiment.

Here, Tci: Time required for determining the stability of the assumed accident i and selecting the electric control device
n: Number of assumed accident cases
Tdi: Time required for transmitting the electric controller setting result of the assumed accident i from the central processing unit to the calculating device. Also, the time Ts1 at which the electric controller is set in the calculating device for one assumed accident, for example, the assumed accident 1, is It is generally expressed by equation (4). This time Ts1 is shorter than the time Ts1 in the first embodiment.

  According to the second embodiment, the transmission time of the control table is shortened, and the control table indicating the electric machine selection result calculated by the central processing unit 9 can be reflected in the arithmetic unit 10 quickly. Stabilization control corresponding to the operation state is possible, and the reliability of power supply in the power system can be improved.

(Third embodiment)
Next, a third embodiment will be described with reference to FIGS. 1 to 6 and also with reference to FIGS.

  In the third embodiment, the description of the same parts as those in the first and second embodiments is omitted. Below, it demonstrates centering on a different part from 1st, 2nd embodiment.

  In the present embodiment, the transmission result of the electric controller setting or the control table indicating it from the central processing unit 9 to the arithmetic unit 10 is used for stability determination, electric device selection, and electric device setting in the control table. Asynchronously separate from processing. That is, the central processing unit 9 performs the electric controller setting process without waiting for the completion of the electric transmission transmission process to the arithmetic unit 10.

  7 and 8 show an example of the processing flow of the online pre-calculation type power system stabilization system according to the present embodiment. In addition, the same code | symbol is attached | subjected to the process which is common in the process in FIG. 4, and the overlapping description is abbreviate | omitted.

  The central processing unit 9 performs a series of processes of steps S2 to S6, S7a, and S8 shown in FIG. 7 by the first function, and asynchronously performs the process of step S7b shown in FIG. 8 by the second function. I do.

  That is, as shown in FIG. 7, the first function performs steps S2 to S6, S7a, and S8 for each assumed accident case, and determines that the stability of the power system can be maintained in step S5, for example. In such a case, the control device is set (step S7a). On the other hand, as shown in FIG. 8, the second function first transmits the control unit setting result set by the function or the control table indicating it to the arithmetic unit 10 (step S7b).

  According to the third embodiment, the effects of the first and second embodiments can be obtained, and the control unit setting process in the central processing unit 9 is not affected by the transmission process to the processing unit 10. This makes it possible to shorten the processing period for setting the electronic control unit.

(Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIGS.

  In this embodiment, the transmission of the electric controller setting result or the control table indicating it from the central processing unit 9 to the arithmetic unit 10 is transmitted from the arithmetic unit 10 to the central processing unit 9 in the electric controller setting or control table. Performed when there is a transmission request.

  FIG. 9 shows an example of a processing flow of the online pre-calculation type power system stabilization system according to the present embodiment.

  The central processing unit 9 performs a series of processes of steps S2 to S6, S7a, and S8 shown in FIG. 7 by the first function, and asynchronously performs step S11 shown in FIG. 9 by the second function. , S12, S7b.

  In other words, as shown in FIG. 9, the second function monitors the presence or absence of a transmission request signal in the control table or the control table from the arithmetic unit 10 (step S11), and when there is a transmission request. (Yes in step S12), first, the controller setting result set by the function or the control table indicating it is transmitted to the arithmetic unit 10 (step S7b).

  According to the fourth embodiment, the effects of the first to third embodiments can be obtained, and transmission processing can be performed based on the judgment of the arithmetic device 10, and processing is performed according to the processing capability of the arithmetic device 10. Can proceed.

  As described in detail above, according to each embodiment, the online pre-computation type power that enables the control result suitable for the current system state to be immediately reflected in the control by the setting result of the electric controller. A system stabilization system and a power system stabilization method can be provided.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example 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 line, 3 ... Transmission line or transformer, 4 ... Circuit breaker (CB), 5 ... Current measuring device (CT), 6 ... Voltage measuring device (VT), 7 ... Accident elimination relay system, DESCRIPTION OF SYMBOLS 8 ... Communication equipment, 9 ... Central processing unit of power system stabilization system, 10 ... Processing unit of power system stabilization system, 11 ... Accident detection terminal device of power system stabilization system, 12 ... Control of power system stabilization system Terminal device 101 ... System information collection means 102 ... System model creation means 103 ... Analysis condition setting means 103a ... System model storage section 103b ... Assumed accident type storage section 103c ... Analysis condition setting section 104 ... Stability Determining means, 104a ... Analysis condition storage section, 104b ... Stability calculating section, 104c ... Stability determining section, 104d ... Control table setting section, 105 ... Electronic controller determining means, 105a ... Control table Le storage unit, 105b ... matching process section, 106 ... accident type detection unit, 107 ... control unit.

Claims (5)

Based on the current connection status and supply and demand status of the power system and the system facility data stored in advance, an analysis system model is created to determine the stability of the power system for each analysis condition of multiple assumed accident data, A central processing unit that sets as a control table the power controllers (generators that limit power supply) necessary for maintaining the stability of the power system when an assumed accident occurs, and the start condition that the accident has occurred in the power system Accident detection terminal device that determines and detects the type of accident, an arithmetic device that determines the electric control device by comparing the detected accident type with the control table, and disconnects the electric control device determined by this arithmetic device from the power system An on-line pre-computation type power system stabilization system comprising:
When there is an assumed accident in which the stability determination, the electric machine selection, and the electric machine setting in the control table are completed, the central processing unit sets the electric machine without waiting for the completion of the processing of other assumed accidents. A power system stabilization system, wherein a result or a control table indicating the result is transmitted to the arithmetic device.   2. The power system stabilization system according to claim 1, wherein the central processing unit performs power controller setting and transmission for an assumed accident in which stability determination, power controller selection, and power controller setting in a control table are completed. When performing, the power system stabilization system characterized by not transmitting a set of control tables to the arithmetic unit, but transmitting only the electric controller setting contents of an assumed accident for which computation has been completed in the control table.   3. The power system stabilization system according to claim 1, wherein transmission from the central processing unit to the processing unit is separated from processing of stability determination, control unit selection, and control unit setting to a control table. Power system stabilization system characterized by being performed asynchronously.   The power system stabilization system according to any one of claims 1 to 3, wherein transmission from the central processing unit to the arithmetic unit is set or controlled by the controller from the arithmetic unit to the central processing unit. A power system stabilization system, which is performed when a table transmission request is made. Based on the current connection status and supply and demand status of the power system and the system facility data stored in advance, an analysis system model is created to determine the stability of the power system for each analysis condition of multiple assumed accident data, A central processing unit that sets the control equipment necessary for maintaining the stability of the power system as a control table when an assumed accident occurs, and the type of the accident is determined and detected based on the start condition as an accident. An accident detection terminal device, an arithmetic device that determines the electric controller by comparing the detected accident type with a control table, and a control terminal device that disconnects the electric controller determined by the arithmetic device from the power system, In the power system stabilization method applied to the online pre-computation type power system stabilization system comprising:
If there is an assumed accident where stability judgment, control device selection, and control device setting in the control table have been completed, the control device setting result or control that indicates it is not waited for the completion of processing of other assumed accidents. A power system stabilization method, comprising: transmitting a table from the central processing unit to the processing unit.

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