JP5628107B2 - Substation monitoring and control equipment - Google Patents

Description

  The present invention relates to a substation monitoring and control device that monitors the operating status of substation equipment including the switching state of switching devices such as circuit breakers and disconnectors in the substation.

  Recently, power generation using natural energy such as wind power and sunlight has been attracting attention for both home use and industrial use. In addition, a technology called smart grid (next-generation transmission network) that efficiently operates a power system that connects a power plant and a customer in, for example, a mesh shape by utilizing IT (Information Technology) technology is also known as a power system. It is attracting attention as a technology responsible for stabilization of

  In each place in such a power system, a substation is provided in order to transform the high voltage power transmitted from the power plant into a low voltage. Many of these substations are unattended in many cases, depending on their voltage class. The substation is provided with a substation monitoring and control device that monitors the operating status of the substation equipment including the switching state of switching devices such as circuit breakers and disconnectors existing in the substation.

  Suppose that the substation monitoring and control device detects that the operating status of the substation equipment has changed, for example, the switching state of the switchgear in a certain substation has changed from closed to open. In this case, the substation monitoring and control apparatus reports to the manned control station that the operating status of the substation equipment has changed. At the control station side, based on the operating status of the substation equipment reported from the substation, the operating status of the entire power system is determined, and the necessity for power interchange and equipment management is determined. Operation of equipment (for example, opening / closing operation of switching equipment existing in a substation) is performed by remote control (for example, refer to Patent Documents 1 and 2).

  According to the substation monitoring and control apparatus according to Patent Literatures 1 and 2, information contributing to stable operation of the power system can be reported in a timely manner.

JP 2002-171616 A JP 2008-043190 A

  The substation monitoring and control apparatus according to Patent Literatures 1 and 2 operates in principle on a 24-hour basis from a request to constantly monitor the operation status of substation equipment. However, for example, at the time of periodic inspection of substation facilities, work for turning off the power of the substation monitoring and control device occurs. In addition, it is assumed that some trouble occurs in the power supply and the stable supply of the power supply is impaired. When the power supply to such a substation monitoring and control device is unstable, for example, erroneous information related to the operation status of the substation equipment is detected due to the discharge characteristics of the capacitors included in the power supply. However, there was a risk of reporting this incorrect information.

  The present invention has been made to solve the above-described problems, and reports erroneous information related to the operating status of substation equipment even when the power supply to the substation monitoring and control device is unstable. The purpose is not to.

The present invention relates to a substation monitoring and control device that monitors the operating status of substation equipment including the switching status of switching equipment existing in the substation, and detects substation information related to the operating status of the substation equipment. The power supply to the function unit of the substation, the notification control unit that performs control to report the substation information detected by the substation information detection unit to an external device, The main feature is that it includes a substation information detection unit and an invalidation processing unit that invalidates the operation of the notification control unit .

  ADVANTAGE OF THE INVENTION According to this invention, even if it is a case where the power supply to a substation monitoring control apparatus is unstable, it can prevent reporting the misinformation regarding the operating condition of a substation equipment.

It is a functional block diagram showing the outline | summary of the electric power system containing the substation by which the substation monitoring control apparatus which concerns on embodiment of this invention is installed, and an electric power feeding control station. 2 (a) to 2 (c) show switching operations of the three time-dependent voltage waveforms output from the DC / DC converter, which are supplied to various functional units in the substation, from the ON state to the OFF state of the power switch. It is explanatory drawing represented on both sides of a time. It is a flowchart figure with which it uses for operation | movement description of the substation monitoring control apparatus which concerns on embodiment of this invention.

  Hereinafter, a substation monitoring and control apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings as appropriate.

(Outline of power system 11 including substation 13 and power supply control station 15 where substation monitoring and control device 17 according to the embodiment of the present invention is installed)
First, an outline of the power system 11 including the substation 13 and the power feeding control station 15 where the substation monitoring and control device 17 according to the embodiment of the present invention is installed will be described with reference to FIG. FIG. 1 is a functional block diagram showing an outline of a power system 11 including a substation 13 and a power supply control station 15 where a substation monitoring and control device 17 according to an embodiment of the present invention is installed. As shown in FIG. 1, the power system 11 is configured by connecting a substation 13 and a power supply control station 15 to each other via a communication line 16.

  As shown in FIG. 1, the substation 13 includes a substation monitoring and control device 17, a substation facility 19, an open / close state detection sensor 25, and a DC power supply 27. The substation equipment 19 includes switching devices such as a circuit breaker 23 and a disconnector (not shown) interposed in the sub bus 21c branched from the branch point 21b on the main bus 21a.

  As shown in FIG. 1, the open / close state detection sensor 25 has a function of detecting the open / close state of the circuit breaker 23 by detecting the movement of the movable contact 23 a provided in the circuit breaker 23. As will be described later, an output signal related to the open / close state detected by the open / close state detection sensor 25 is input to the A / D conversion unit 39 of the substation monitoring control device 17 via the signal line 29a.

  As shown in FIG. 1, the DC power supply 27 is a power supply that outputs DC power having a power supply potential (V0) of 110 V, for example. As will be described later, the DC power output from the DC power source 27 is a DC / DC converter (corresponding to the “power converter” of the present invention) 35 of the substation monitoring and control device 17 through the power supply line 29b and the like. Is input.

  As shown in FIG. 1, the substation monitoring and control device 17 includes a main control unit 31, a power switch 33, a DC / DC converter 35, a voltage detection unit 37, and an A / D conversion unit 39. It is configured. The power switch 33 is provided so as to be interposed in a power supply line 29 b connecting the DC power supply 27 and the DC / DC converter 35. The power switch 33 is, for example, a normally-closed switch. When the substation equipment 19 is regularly inspected, when it is modified to add equipment to the substation 13, or when repairing a faulty device, maintenance personnel, etc. Is operated to the open side.

  As shown in FIG. 1, the DC / DC converter 35 inputs DC power of the power supply potential (V0) supplied from the DC power supply 27, for example, DC power of the first potential (V1) of 24V and 5V, for example. The second electric potential (V2) of DC power is converted and output. As shown in FIG. 1, the DC power of the first potential (V1) is supplied to the open / close state detection sensor 25 (see the power supply terminal 25a) and the A / D converter 39 (see the power supply terminal 29e), respectively. Further, the DC power of the second potential (V2) is supplied to the main control unit 31 (see the power supply terminal 29f) as shown in FIG.

  As shown in FIG. 1, the voltage detection unit 37 is connected to the DC power supply 27 via the power supply terminal 29 b 1 of the power supply line 29 b and the power switch 33. Therefore, the DC power of the power supply potential (V0) is input to the voltage detection unit 37 when the power switch 33 is turned on. The voltage detector 37 compares the magnitude relationship between the potential of the power supply terminal 29b1 and a predetermined reference potential (for example, 100V). When the potential of the power supply terminal 29b1 is less than the reference potential, the power switch 33 Is operated to output a power switch off detection signal to the A / D converter 39 via the signal line 29c.

  As shown in FIG. 1, the A / D conversion unit 39 converts an analog signal related to the open / closed state detected by the open / closed state detection sensor 25 into a digital signal and outputs the digital signal. The A / D converter 39 converts the analog signal relating to the power switch off detected by the voltage detector 37 into a digital signal and outputs the digital signal. The digital signal output from the A / D conversion unit 39 is supplied to the main control unit 31 via the signal line 29d.

As shown in FIG. 1, the main control unit 31 includes a substation information detection unit 41, an invalidation processing unit 43, and a notification control unit 45.
The main control unit 31 includes a microcomputer (not shown) (hereinafter referred to as “microcomputer”) including a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. The microcomputer functions to read and execute a program stored in the ROM and to control the execution of the above-described functional units 41, 43, and 45.

  The substation information detection unit 41 has a function of detecting substation information related to the operation status of the substation equipment 19 including the open / close state of switchgear such as the circuit breaker 23 and the disconnector (not shown). As shown in FIG. 1, the substation information detection unit 41 cooperates with the open / close state detection sensor 25 and the A / D conversion unit 39 to function as a “substation information detection unit” according to the present invention. Has come to fulfill.

  The invalidation processing unit 43 is abbreviated as various functional units in the substation 13 (open / closed state detection sensor 25, main control unit 31, A / D conversion unit 39; hereinafter, “various functional units 25, 31, 39”). ) Has a function of invalidating the operation of at least one of the substation information detection unit 41 and the notification control unit 45 when the power supply to the station is unstable. Here, “invalidating at least one of the operations of the substation information detection unit 41 and the notification control unit 45” includes the subject matter of the present invention such as preventing reporting of erroneous information related to the operation status of the substation equipment 19. As an embodiment according to the present invention, the following three aspects are included. That is, as an embodiment related to the subject matter of the present invention, a first mode in which the detection operation performed by the substation information detection unit 41 is invalidated, and a report of information related to the operation status of the substation facility 19 performed by the report control unit 45 A second mode in which the control operation is invalidated and a third mode in which these first and second modes are combined are included.

  In the first mode in which the detection operation performed by the substation information detection unit 41 is invalidated, erroneous information related to the operation status of the substation equipment 19 is prevented by cutting off the source of generation of erroneous information. Moreover, in the 2nd aspect which invalidates the report control operation | movement of the information which concerns on the operation condition of the substation equipment 19 which the report control part 45 performs, the operation | movement of the substation equipment 19 is cut | disconnected by cutting off the source of erroneous information at the water's edge. It prevents reporting of misinformation related to the situation. And in the 3rd mode which combined these 1st and 2nd modes, by constructing a double fail-safe mechanism that cuts off the source of erroneous information from the source and disconnects the source of erroneous information at the water's edge In this way, reporting of erroneous information related to the operating status of the substation equipment 19 is prevented.

The “case where the power supply to the various functional units 25, 31, 39 in the substation 13 is unstable” is typically a case where the power switch 33 is switched from the on state to the off state. Means.
However, for example, when the power supply line 29b is disconnected or a contact failure between the DC power supply 27 and the power supply line 29b occurs, the power supply to the various functional units 25, 31, and 39 in the substation 13 is unstable. It becomes. Therefore, such a case also corresponds to the above-mentioned “case where the power supply to the various functional units 25, 31, 39 in the substation 13 is unstable”.

  The report control unit 45 is a control for reporting information related to the operation status of the substation equipment 19 obtained based on the substation information detected by the substation information detection unit 41 to the substation supervision management apparatus 51 described below. It has a function to perform.

  On the other hand, the power supply control station 15 is provided with a substation overall management device 51 corresponding to an “external device”. The substation supervising management device 51 grasps the operation status of the entire power system 11 based on the operation status of the substation equipment notified from the substation 13 and determines the necessity for power interchange and equipment management. Thus, the operation of the substation equipment 19 (for example, the opening / closing operation of the circuit breaker 23 or the like existing in the substation 13) is implemented by a remote control.

(Organization of problems according to the present invention)
Here, prior to explaining the operation of the substation monitoring and control device 17 according to the embodiment of the present invention, when the power supply to the various functional units 25, 31, and 39 in the substation 13 is unstable, the substation With reference to FIG. 2, a description will be given of an action mechanism that detects erroneous information related to the operating status of the equipment 19 and reports the erroneous information. 2A to 2C show three patterns of voltage temporal waveforms output from the DC / DC converter 35 supplied to the various functional units 25, 31, and 39 in the substation 13. FIG. 6 is an explanatory diagram showing a switching operation time point t1 from an on state to an off state.

  As shown in FIG. 2A, in the time-dependent characteristics relating to the potential of the power supply terminal 29b1 to the voltage detector 37, the power supply potential (V0; for example, 100V) corresponding to the on state at the time t1 when the power switch 33 is turned off. It can be seen that the potential level as described above is switched from a voltage level of 110 V in this embodiment to a potential corresponding to the off state (for example, 10 V or less) without delay. At this time, when the voltage detection unit 37 detects that the power switch 33 is turned off, the voltage detection unit 37 operates to output a power switch off detection signal to the A / D conversion unit 39 via the signal line 29c.

  As shown in FIG. 2B, the time-dependent characteristics relating to the potentials of the power supply terminal 25a to the open / close state detection sensor 25 and the power supply terminal 29e to the A / D converter 39 are as shown in FIG. Similarly to the example, at the time t1 when the power switch 33 is turned off, the first potential corresponding to the on state (V1; for example, a potential level such as 20 V or higher, which is 24 V in this embodiment) corresponds to the off state. It can be seen that the potential is switched to a potential (for example, a potential level of 3 V or less and 0 V in this embodiment) without delay. At this time, the open / closed state detection sensor 25 outputs a non-voltage signal indicating that the potential of the power supply terminal 25a is a potential (0V) corresponding to the OFF state to the A / D conversion unit 39 via the signal line 29a. To work.

  The A / D converter 39 operates to convert an analog signal input when the power switch 33 is turned off into a digital signal and output the digital signal to the main controller 31. As a result, a non-voltage signal is transmitted to the main controller 31 as the potential level of the power supply terminal 25a. This transmission of the no-voltage signal causes erroneous information, as will be described later.

  On the other hand, as shown in FIG. 2C, the time-dependent characteristic relating to the potential of the power supply terminal 29f to the microcomputer (main control unit 31) corresponds to the on state at the time t1 when the power switch 33 is turned off. The second potential (V2; in this embodiment, 3V or more and the rated voltage is a potential level of 5V) is maintained as it is. Here, when the minimum operation guarantee voltage of the microcomputer 31 (for example, a voltage value according to the specification of the microcomputer such as 3 V) is taken into consideration, the potential of the power supply terminal 29f to the microcomputer 31 is the second potential (V2 corresponding to the ON state). It is understood that a predetermined delay time Td is required for switching from 3 V or higher) to less than the minimum guaranteed operating potential (3 V) corresponding to the OFF state.

  During this delay time Td, the potential of the power supply terminal 29f to the microcomputer 31 is maintained at or above the minimum guaranteed operating voltage. For this reason, the microcomputer 31 continues normal operation even after the power switch 33 is turned off.

  On the other hand, in the time-dependent characteristics relating to the potentials of the power supply terminals 25a and 29e, as shown in FIG. 2B, the power switch 33 is switched to the off state without delay from the time t1 when the power switch 33 is turned off. At this time, the open / close state detection sensor 25 is in a state of detecting the open / close state corresponding to “low level”, and the output signal of the open / close state detection sensor 25 thus detected is after the power switch 33 is turned off. Thus, the microcomputer (main control unit 31) is supplied during a period in which the microcomputer continues normal operation.

Here, an example of setting the correspondence between the open / close state of the circuit breaker 23 and the output signal of the open / close state detection sensor 25 will be described with reference to Table 1. When the open / close state of the circuit breaker 23 is “open”, the output signal of the open / close state detection sensor 25 corresponding to this is set to “low level” (when the power switch 33 is on) as shown in Table 1. It is assumed that When the open / close state of the circuit breaker 23 is “closed”, the corresponding output signal of the open / close state detection sensor 25 is “high level” (when the power switch 33 is turned on) as shown in Table 1. It is assumed that it is set to.

  Assume that the power switch 33 is turned off when the correspondence between the open / close state of the circuit breaker 23 and the output signal of the open / close state detection sensor 25 is set as described above. In this case, as shown in Table 1, the open / close state detection sensor 25 outputs a “low level” no-voltage signal regardless of whether the open / close state of the circuit breaker 23 is “open” or “closed”. To do. This is based on the fact that the open / closed state detection sensor 25 cannot perform a normal operation unless the power supply potential V1 is supplied. This “low level” no-voltage signal is supplied after the power switch 33 is turned off and during the normal operation of the microcomputer (main control unit 31).

  In the above-described case, the microcomputer (main control unit 31) detects that the open / close state detection sensor 25 detects “open” of the circuit breaker 23, or erroneously provides information on the open / close state of the circuit breaker 23 that is different from the actual state. It cannot be distinguished whether it has been output (refer to the comparison of the two underlined portions in Table 1). As a result, when the power supply to the substation monitoring and control device 17 is unstable, the substation monitoring and control device 17 detects erroneous information related to the operating status of the substation equipment 19 and reports this erroneous information. There was a risk of it.

(Operation of the substation monitoring and control device 17 according to the embodiment of the present invention)
Next, the operation of the substation monitoring and control device 17 according to the embodiment of the present invention will be described with reference to FIG. FIG. 3 is a flowchart for explaining the operation of the substation monitoring and control device 17 according to the embodiment of the present invention. The process flow shown in FIG. 3 is always executed while the substation monitoring control device 17 is in operation.

  In step S <b> 11, the voltage detection unit 35 constantly monitors whether the power switch 33 is turned off while the substation monitoring control device 17 is in operation.

If the voltage detection unit 35 detects that the power switch 33 is turned off during the monitoring in step S11, the main control unit 31 advances the process flow to the next step S12.
Note that the monitoring process in step S11 is continuously executed while receiving the power supply of the potential V0 until the power switch 33 is switched from the on state to the off state.

  In step S12, the invalidation processing unit 43 invalidates the detection operation performed by the substation information detection unit 41 (first mode). Thereby, the invalidation processing unit 43 executes a process of invalidating the output signal of the open / closed state detection sensor 25.

  The invalidation process in step S12 is executed during a period in which the microcomputer (main control unit 31) continues normal operation after the power switch 33 is turned off and before the delay time Td has passed. The After executing the invalidation process in step S12, the main control unit 31 advances the process flow to the next step S13.

  In step S13, the notification control unit 45 notifies the substation supervising management device 51 of the power supply control station 13 that the substation monitoring control device 17 is in a power-off state. This notification is performed by the report control unit 45 executing control for reporting information related to the operation status of the substation equipment 19 to the substation supervising management apparatus 51.

  The notification control process in step S13 is executed during a period in which the microcomputer (main control unit 31) continues normal operation after the power switch 33 is turned off and before the delay time Td has passed. The After executing the notification control process in step S13, the main control unit 31 ends the flow of the series of processes.

(Operational effects produced by the substation monitoring and control device 17 according to the embodiment of the present invention)
In the substation monitoring and control device 17 according to the embodiment of the present invention, the invalidation processing unit 43 performs the substation information when the power supply to the various functional units 25, 31, and 39 in the substation 13 is unstable. It operates to invalidate the operations of the detection unit 41 and the notification control unit 45 . Therefore, according to the substation monitoring and control apparatus 17 according to the embodiment of the present invention, even if the power supply to the substation monitoring and control apparatus 17 is unstable, an error related to the operation status of the substation equipment 19 is detected. Information reporting can be prevented beforehand.

  There are roughly three approaches as embodiments for realizing the subject “preventing reporting of erroneous information relating to the operation status of the substation equipment 19” according to the present invention.

  Among these, in the first mode “invalidating the detection operation performed by the substation information detection unit 41”, reporting the erroneous information related to the operating status of the substation equipment 19 by disconnecting the source of the erroneous information from the source. Can be prevented in advance.

  Further, in the second mode “invalidating the information control operation of information related to the operation status of the substation equipment 19 performed by the report control unit 45”, the substation equipment 19 It is possible to prevent reporting of misinformation related to the operating status.

  And in the 3rd mode which combined these 1st and 2nd modes, by constructing a double fail-safe mechanism that cuts off the source of erroneous information from the source and disconnects the source of erroneous information at the water's edge In addition, it is possible to prevent reporting of erroneous information related to the operation status of the substation equipment 19.

[Other Embodiments]
The embodiment described above shows an example of realization according to the present invention. Therefore, the technical scope of the present invention should not be limitedly interpreted by this description. This is because the present invention can be implemented in various forms without departing from the gist or main features thereof.

  Specifically, for example, in the description of the present embodiment, the substation supervising management device 51 of the power supply control station 15 is a partner who receives a report of information related to the operation status of the substation equipment 19 from the substation monitoring control device 17. However, the present invention is not limited to this example.

  For example, a substation monitoring and control device of another substation may be used as a counterpart to receive information on the operational status of the substation equipment 19 from the substation monitoring and control device 17, or under the control of the power company. May be a central management station of the central command station.

  In the description of the present embodiment, the first potential (V1; 24V) is used as a form of power supplied by a DC / DC converter (power converter) 35 including a capacitor (not shown) that temporarily stores electric energy. Although the DC power supply and the DC power supply of the second potential (V2; 3V or more and the rated voltage is 5V) have been described as examples, the present invention is not limited to this example. As a form of power supplied by the DC / DC converter (power converter) 35, the number of power supplies or the potential of each power supply may be set to an arbitrary value.

DESCRIPTION OF SYMBOLS 11 Electric power system 13 Substation 15 Power feeding control station 16 Communication line 17 Substation monitoring and control apparatus 19 Substation equipment 23 Circuit breaker (switching device)
25 Open / Closed State Detection Sensor 27 DC Power Supply 31 Main Control Unit 33 Power Switch 35 DC / DC Converter (Power Converter)
37 Voltage Detection Unit 39 A / D Conversion Unit 41 Substation Information Detection Unit 43 Invalidation Processing Unit 45 Notification Control Unit 51 Substation General Management Device (External Device)

Claims (2)

In a substation monitoring and control device that monitors the operational status of substation equipment, including the switching status of switchgear in the substation,
A substation information detecting unit for detecting substation information related to the operating status of the substation equipment;
A notification control unit that performs control to report the substation information detected by the substation information detection unit to an external device;
When power supply to various functional units in the substation is unstable, an invalidation processing unit for invalidating the operation of the substation information detection unit and the notification control unit ,
A substation monitoring and control device comprising: The substation monitoring and control device according to claim 1,
Power supply to various functional units in the substation is performed via a power converter including a capacitor that temporarily stores electrical energy.
Substation monitoring and control device characterized by that.

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