WO2020090021A1 - Power system monitoring device and method - Google Patents

Abstract

The present invention provides a power system monitoring device which can monitor a power system, even when a power flow state or an operation mode of the power system changes. The power system monitoring system 10 includes: an operation tolerance value calculation unit 31 which calculates at least one operation tolerance value D4 from one or more among a measurement value D1 and a setting value D2; a difference calculation unit 32 which calculates the difference D5 from one or more among the operation tolerance value calculated by the operation tolerance value calculation unit, the measurement value, and the setting value; an operation tolerance value selection unit 33 which selects an operation tolerance value D6 to be output from one or more among the operation tolerance value calculated by the operation tolerance value calculation unit, the difference calculated by the difference calculation unit, and the setting value; and an output unit 43 which allows one or more among the measurement value, the setting value, the operation tolerance value, and the difference to be displayed with respect to the selected operation tolerance value to be output.

Description

Power system monitoring apparatus and method

The present invention relates to a power system monitoring device and method.

Japanese Patent Application Laid-Open No. 2004-242242 describes that "a plurality of monitoring point candidates are set in the power system, the system state quantity at the monitoring point candidates is input to a computer, and changes in the system state quantity are monitored. Either one or both of the monitoring point candidates that exceed the set value and the monitoring point candidate that the system state quantity is kept near the upper and lower limits within the setting range are set as the monitoring points. " It is described (see Patent Document 1 abstract).

In Patent Document 2, "Measurement value fetching means 2 fetches a power flow value of a power system via a distant monitoring control device 1. A power flow allowable value calculating means 5 calculates a plurality of power flow allowable values based on system operating conditions. Then, the minimum permissible value determining means 6 selects the minimum power flow allowable value, and the power flow deviation detecting means 3 selects the power flow value captured by the measured value capturing means 2 by the minimum allowable value determining means 6. It is determined whether or not the minimum power flow allowable value is exceeded, and if the measured power flow value deviates from the minimum power flow allowable value, an alarm is output by the alarm output means 4 "(see Patent Document 2 Abstract). ).

Note that current capacity calculation, dynamic rating calculation, and heat capacity calculation are described in Non-Patent Documents 1 and 2. The state estimation calculation is described in Non-Patent Document 3. The power flow calculation is described in Non-Patent Document 4. The optimum power flow calculation is described in Non-Patent Document 5. The transient stability calculation is described in Non-Patent Documents 6 and 7. The steady-state stability calculation may use a method of the steady-state stability calculation that is the same calculation as the transient stability calculation, or the method described in Non-Patent Documents 8 and 9. The voltage stability calculation is described in Non-Patent Documents 10 and 11. The frequency stability calculation is described in Non-Patent Document 12. The power transmission rule is described in Non-Patent Document 13.

Japanese Patent Laid-Open No. 10-164756 JP-A-9-182319

In the future, it is conceivable that renewable energy will be introduced into the power system and that power trading based on the power market will progress (activate) in the future. Renewable energy such as solar power generation or wind power generation is an output fluctuation type power source whose output fluctuates depending on the weather, so if the introduction of renewable energy into the power system progresses, voltage classes and inter-operator (power generation , Power transmission and distribution companies, etc.) In addition, when the power trade becomes active, the power flow state or the operation form of the power system changes in a complicated and frequent manner. Therefore, the power flow state or the operation mode changes more complicatedly and more frequently than the present time, and the current system planning, operation and control may not be able to operate the power system stably and economically.

-In the future, if the power flow status or operation mode changes more complicatedly and frequently, the setting of monitoring points will be changed frequently. Therefore, it is considered that the technology of Patent Document 1 makes it difficult to realize system stability and economical operation.

It should be noted that in Patent Document 1, "the setting of the above-mentioned monitoring point may be performed at each timing of controlling the system state quantity of the control target, and according to this, it is applied to the time zone when the power demand changes abruptly. This enables high-quality power with less voltage fluctuation to be supplied.On the other hand, the processing cycle for setting monitoring points can be lengthened during times when power demand changes little, such as at night. However, there is no specific disclosure about the cycle of setting the monitoring points.

Further, in the future, if the power flow state or the operation form changes more complicatedly and frequently, it is necessary to reselect the minimum power flow allowable value at a high frequency. Therefore, the technique of Patent Document 2 reduces the usability of the operator and It will be difficult to achieve stability and economic operation.

Note that the technology called DR (Dynamic Rating, Dynamic Rating) is also known in the past. In the DR, the transmittable capacity (power operation allowable value) of the power transmission and transformation equipment, which is calculated by keeping the external environment data such as the temperature constant, is calculated by using the external environment data collected in real time or in a constant cycle. When the power system is operated using DR, if the operation allowable value changes frequently, the operator's labor becomes complicated, and it becomes difficult to realize system stability and economical operation.

Therefore, an object of the present invention is to provide an electric power system monitoring device and method capable of monitoring the electric power system even when the power flow state or the operation form of the electric power system changes.

In order to solve the above problems, the power system monitoring device according to the present invention includes an operation allowance calculator that calculates at least one operation allowance from one or more of a measured value and a set value, and an operation allowance calculator. Difference calculation unit that calculates the difference from one or more of the operation allowance value, the measured value, and the set value that have been calculated, and the operation allowance value calculated by the operation allowance value calculation unit and the difference and the setting value calculated by the difference calculation unit The operation allowance value selection unit that selects the operation allowance value for the output target from one or more of the above, and the difference between the measured value, the set value, and the operation allowance value for the selected operation allowance value for the output target. An output unit for outputting one or more of the above.

According to the present invention, it is possible to display one or more of the measured value, the set value, the operation allowable value, and the difference for the selected operation allowable value of the output target according to a predetermined display method.

1 is an overall configuration diagram of a power system monitoring device according to a first embodiment. FIG. 1 is an overall configuration diagram including a hardware configuration of a power system monitoring device. It is a block diagram which shows the content of a program database. It is a flowchart of a power system monitoring process. It is a flow chart of operation allowable value calculation processing. It is a flow chart of difference calculation processing and operation permissible value selection processing. It is a figure which shows setting value data. An example of the calculation result of the operation allowable value selection process is shown. An example of the calculation result of the operation allowable value calculation process is shown. It is an example of a calculation result of the operation allowable value calculation process. It is an example of a calculation result of the operation allowable value calculation process. It is an example of a calculation result of the operation allowable value selection process. It is an example of a calculation result of the operation allowable value selection process. It is an example of a calculation result of the operation allowable value selection process. An example of the system diagram screen which displays a system diagram is shown. An example of a system monitoring screen is shown. The example which displayed the driving | running trajectory of the system monitoring screen is shown. An example of the calculation result screen of the operation allowable value is shown. FIG. 7 is an overall configuration diagram of a power system monitoring device according to a second embodiment. 1 is an overall configuration diagram including a hardware configuration of a power system monitoring device. An example of priority data is shown. It is a flow chart of difference calculation processing and operation permissible value selection processing. An example of a system monitoring screen is shown. FIG. 7 is an overall configuration diagram of a power system monitoring device according to a third embodiment. 1 is an overall configuration diagram including a hardware configuration of a power system monitoring device. It is a block diagram which shows the content of a program database. 9 is a flowchart of a power system monitoring process in the third embodiment. It is a flow chart of difference calculation processing, operation allowable value selection processing, and operation allowable value command selection processing. It is explanatory drawing which shows the determination result of the improvement measure. It is explanatory drawing which shows the determination result of another improvement measure. It is an example of an operation support screen. It is a whole block diagram of the electric power system monitoring apparatus in Example 4. 1 is an overall configuration diagram including a hardware configuration of a power system monitoring device. It is a block diagram which shows the content of a program database. It is a flow chart which shows electric power system monitoring processing. It is a whole block diagram of the electric power system monitoring apparatus in Example 5. 1 is an overall configuration diagram including a hardware configuration of a power system monitoring device. It is a block diagram which shows the content of a program database. It is a flow chart which shows electric power system monitoring processing. It is an explanatory view showing evaluation of an operation allowance.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The power system monitoring device according to the present embodiment can monitor the power system automatically, manually, or semi-automatically. The power system monitoring device according to the present embodiment can support the judgment of the user who monitors the power system, and thus can also be called a power system monitoring support device. Here, "supporting the user's judgment" means, for example, judgment of control, judgment of degree of violation, judgment of problem area, judgment of improvement measures, and judgment of settling value. Including one or more or all.

In the present embodiment, as one example, display contents (output contents) of operation constraint information (for example, operation range, operation upper limit value or lower limit value, nomogram, etc.) indicating operation constraints used for monitoring the power system. ) And the display method (output method) are dynamically changed according to the power flow state or operation mode of the power system. The operation constraint information is information including an operation allowable value. The power system monitoring device can display the operation allowable value of the output target on a display device or the like, and can also transmit or output to another device. Hereinafter, the case where the output is the display output will be described as an example.

The power system monitoring device according to the present embodiment calculates operation allowable values for a plurality of evaluation axes (axis that evaluates operation allowable values of monitored variables (PQVF etc.)). Then, the power system monitoring device according to the present embodiment selects an operation allowable value to be output from the calculated operation allowable values according to a predetermined condition and causes the output unit to display it. That is, the power system monitoring device operates the output target so as to be updated at a predetermined frequency from the operation allowable values (which can also be called the operation allowable value candidates) calculated on the selected evaluation axis. Select an acceptable value.

In the present embodiment, monitoring targets (for example, P (fence power flow), Q, V, F, etc.) in one or a plurality of paths (power transmission routes) to which power is supplied across each business operator are provided. Multi-dimensional operational constraint information can be created respectively. In this embodiment, it is possible to provide the user with all the operation constraint information or a part of the selected operation constraint information. The operation constraint information may be provided to a computer terminal used by the user or an external control system. In this embodiment, when providing the operation constraint information, the providing method can be controlled. For example, the update frequency can be reduced for all or part of the information included in the operation restriction information.

In this embodiment, as will be described later, the operation allowable value is calculated based on the calculation condition and the measured value, and the output content and frequency of the operation allowable value are changed based on the calculation result and the set value. Thus, the power system monitoring device according to the present embodiment, at least one or both of system stability or economical operation, even when the power flow state of the power system to be monitored or the operation mode is complicated and changes frequently. Can be realized.

That is, the power system monitoring apparatus according to the present embodiment includes, for example, an operation allowance value calculation unit 31 that calculates an operation allowance value from one or more of calculation conditions and measured values, and a calculation result D4 ( (Operation allowance value), a measurement value D1 and a set value D2, and a difference calculation unit 32 that calculates a difference (for example, a difference or a ratio) D5, and a calculation result D4 of the operation allowance value calculation unit 31 and the difference. An operation allowance value selection unit 33 that selects an operation allowance value from one or more of the calculation result D5 (difference) and the setting value D2 of the calculation unit 32, a calculation condition, a measurement value D1, a setting value D2, and the operation allowance value calculation result. The output unit 43 displays one or more of D4, the difference calculation result D5, and the operation allowable value selection result D6.

According to the power system monitoring device configured as described above, the content or frequency of the operation allowable value can be changed based on the set value and the measured value. Therefore, the power system monitoring device of the present embodiment, at least one of system stability and economical operation, even when the power flow state or operation mode of the monitored power system changes more complexly and frequently than the current configuration. Either one or both can be realized. Further, according to the present embodiment, the user (operator) does not need to change the setting value frequently for the operation of the power system monitoring device, so that the labor of the user can be reduced and the usability of the user can be improved. Is improved.

In the present embodiment, a power monitoring device or power monitoring method having the following configuration is disclosed. The power system monitoring device or the power monitoring method may be realized by a computer program running on one or more computers. Further, the computer program can be distributed on a communication network or can be distributed in a state of being stored in a storage medium.

(Structure 1)
In the power system monitoring device 10 in the power system,
An operation allowance value calculation unit 31 for calculating at least one operation allowance value D4 from one or more of the measurement value D1 and the set value D2,
A difference calculation unit 32 that calculates a difference from one or more of the operation allowable value D4 calculated by the operation allowable value calculation unit 31, the measured value D1, and the set value D2;
From the operation allowable value D4 calculated by the operation allowable value calculating unit 31, the difference D5 calculated by the difference calculating unit 32, and the set value D2, one or more of the operation allowable value of the output target according to a predetermined condition. An operation allowable value selection unit 33 for selecting the value D6,
An output unit 43 that outputs one or more of the measured value D1, the set value D2, the operation allowable value D6, and the difference D5 with respect to the selected operation allowable value D6 of the output target.
An electric power system monitoring device.

(Configuration 2)
In the power system monitoring device according to configuration 1,
The predetermined condition is to extract an operation allowance value satisfying a predetermined update frequency from operation allowance values included in one or more predetermined evaluation axes selected from a plurality of evaluation axes,
Power system monitoring device.

(Structure 3)
In the power system monitoring device according to configuration 1,
The set value D2 is an operation target value, an operation upper / lower limit value, a constraint condition, a threshold value, a margin, a filter time constant, a discretization condition, an operation allowable set time, an allowable current calculation condition, a line configuration, a line resistance, a line type, and a system. A power system monitoring device that is one or more of a configuration, a system topology, a line constant, a generator constant, and system data.

(Structure 4)
In the power system monitoring device according to configuration 1,
The measured value D1 is active power, reactive power, apparent power, voltage, frequency, power factor, weather condition, temperature, wind speed, wind direction, solar radiation, load current value, wire temperature, ambient temperature, telemeter information, supervision information. , A power system monitoring device.

(Structure 5)
In the power system monitoring device according to configuration 1,
The operation allowance value selection unit 33A selects the operation allowance value of the output target based on the priority D8 preset for at least one operation allowance value calculated by the operation allowance value calculation unit. Monitoring equipment.

(Structure 6)
In the power system monitoring device according to configuration 1,
The operation allowance value calculation unit 31 uses the operation allowance value candidates as current capacity calculation, dynamic rating calculation, heat capacity calculation, power flow calculation, transient stability calculation, stationary stability calculation, voltage stability calculation, frequency stability calculation, An electric power system monitoring device characterized by being obtained from one or more of cascading calculation, islanding calculation, and transmission rules between electric power companies.

(Structure 7)
In the power system monitoring device according to configuration 6,
The difference calculation unit 32 calculates a difference from the operation allowable value candidate and the setting value, and determines an operation allowable value of the output target based on the calculation result of the difference and the setting value. Monitoring equipment.

(Structure 8)
In the power system monitoring device according to configuration 6,
The operation allowance value selection unit 33 uses the set value to pass the operation allowance value candidate through one or more of a low pass filter, a moving average filter, a high pass filter, a moving difference filter, a band pass filter, or a discrete value. The power system monitoring apparatus determines the operation allowable value of the output target by converting the output power into a power system.

(Configuration 9)
In the power system monitoring device according to configuration 1,
The operation allowance value selection unit 33 is a power system monitoring device that selects the operation allowance value to be output from the difference between the operation allowance value calculated by the operation allowance value calculation unit and the measured value.

(Configuration 10)
In the power system monitoring device according to configuration 1,
The output unit 43, one or more operation allowable values of the output target, a one-dimensional numerical value, a two-dimensional numerical table, a two-dimensional plan view, a two-dimensional nomogram diagram, a three-dimensional nomogram diagram, multidimensional A power system monitoring device that outputs at least one of a diagram and a multidimensional nomogram diagram.

(Configuration 11)
In the power system monitoring device according to configuration 10,
The output unit 43 further includes notifying means for notifying a time transition of the operation allowable value of the output target, and the notifying means is one-dimensional numerical value, one or more blinks of colon or time, two-dimensional By outputting at least one or more of a time-series waveform, a trajectory of a driving point in a two-dimensional plan view or a nomogram diagram, a trajectory of a driving point in a three-dimensional nomogram diagram, or a trajectory of a driving point in a multidimensional nomogram diagram, A power system monitoring device that notifies the time transition of the operation allowable value.

(Configuration 12)
In the power system monitoring device according to configuration 11,
The output unit 43, based on the input instruction, at least one or more of reproduction, rewind, fast forward, pause, skip for a fixed time, repeat, and the like regarding time transition of the operation allowable value of the output target. A power system monitoring device that outputs at.

(Configuration 13)
In the power system monitoring device according to configuration 5,
The priority D8 is a power system monitoring device that is a weighting factor set based on at least one of system information, operation information, weather information, and operation constraints.

(Configuration 14)
In the power system monitoring device according to configuration 13,
When the operation allowance value selection unit 33A calculates a difference between the operation allowance value calculated by the operation allowance value calculation unit and the measurement value, and selects the operation allowance value of the output target based on the difference. And, based on the difference weighted by the priority, at least one or both of the case of selecting the operation allowable value of the output target,
Power system monitoring device.

(Configuration 15)
In the power system monitoring method of monitoring the power system with a computer,
The calculator is
An operation allowance calculation step of calculating at least one operation allowance from one or more of the measured value and the set value,
A difference calculation step of calculating a difference from one or more of the operation allowable value, the measured value, and the setting value calculated by the operation allowable value calculating step,
Operation allowance value selecting step of selecting an operation allowance value to be output from one or more of the operation allowance value calculated in the operation allowance value calculating step, the difference calculated in the difference calculating step, and the setting value When,
An output step of outputting one or more of the measured value, the set value, the operation allowable value, and the difference based on a predetermined output method for the selected operation allowable value of the output target,
The power system monitoring method for executing.

(Configuration 16)
In the power system monitoring device according to configuration 13,
The operation allowance value selection unit 33A calculates the difference between the operation allowance value calculation result and the measurement value, and selects the operation allowance value to be output from the difference calculation result, and the difference calculation result. An electric power system monitoring device characterized by calculating both or one of the cases where an operation allowable value of an output target is selected after weighting priorities.

(Configuration 17)
In the power system monitoring device according to configuration 16,
The output unit 43 outputs a difference value when selecting an operation allowance value to be output without weighting the priority and when selecting an operation allowance value to be output after weighting the priority. However, the power system monitoring device is characterized in that both can be switched.

Other configurations than those described above can be obtained based on the description of the embodiments and the drawings described later.

Example 1 will be described with reference to FIGS. 1 to 18. The following description shows an example of the content of the present invention. The present invention is not limited to the following description, and various changes and modifications can be made by those skilled in the art within the scope of the technical idea disclosed in this specification.

The power system monitoring device 10 according to the present embodiment calculates the operation allowable value D4 using the measured value data D1 and the set value data D2, and calculates the operation allowable value calculation result data D4, the measured value data D1, and the set value data. The difference D5 is calculated from at least one of D2, the operation allowable value D6 is selected from at least one of the operation allowable value calculation result data D4, the difference calculation result data D5, and the set value data D2, and the measured value data D1 is obtained. One or more of the set value data D2, the operation allowable value calculation result data D4, the difference calculation result data D5, and the operation allowable value selection result data D6 are displayed.

The functions of the power system monitoring device 10 can be roughly divided into, for example, a data acquisition unit 40, a calculation unit 41, a result storage unit 42, and a display output control unit 43. The data acquisition unit 40 acquires the input data D40. The input data D40 includes data D1 (measured value D1) and data D2 (set value D2). The data D1 is managed by the measurement value database DB1. The data D2 is managed by the setting value database DB2. The calculation unit 41 includes an operation allowance value calculation unit 31, a difference calculation unit 32, and an operation allowance value selection unit 33. Hereinafter, these respective functions 31 to 33 may be referred to as calculation units 31 to 33.

The result storage unit 42 stores the result data D42. The result data D42 includes data D4 (calculation result of operation allowable value), data D5 (calculation result of difference), and data D6 (selection result of operation allowable value). The data D4 is managed in the operation allowable value calculation result database DB4. The data D5 is managed by the difference calculation result database DB5. The data D6 is managed in the operation allowable value selection result database DB6. Hereinafter, the names of the databases DB1 to DB6 may be simplified and expressed, as the measurement value database DB1 is simplified and shown as the database DB1.

Hereinafter, the measured value data D1 and the set value data D2 may be simply referred to as the measured value D1 and the set value D2. Other data D4 to D6 may be simplified as appropriate.

The measured value D1 is input to the operation allowable value calculation unit 31 and the difference calculation unit 32. The set value D2 is input to each of the calculation units 31 to 33.

The measurement value D1 is, for example, PQVF (active power value, reactive power value, voltage value, frequency) of the tidal current. The measurement value D1 may be time-series data. The set value D2 is, for example, one or more preset operation allowable values (may be time series data), a threshold value for determining necessity, and the like. The operation allowable value may be a value indicating an operation range, an upper limit value or a lower limit value of operation, or a nomogram. The operation allowable value can also be calculated from the measured value D1 and data indicating the system configuration (system data).

The operation allowance D4, which is the calculation result of the operation allowance calculator 31, is input to the database DB4 and the difference calculator 32. The difference D5, which is the calculation result of the difference calculation unit 32, is input to the database DB5 and the operation allowable value selection unit 33. The operation allowance value selection unit 33 selects the operation allowance value D6 to be output based on the set value D1, the operation allowance value D4, and the difference D5. The selected operation allowable value D6 is input to the database D6.

The output control unit 43 as an “output unit” controls the content and timing of information provided to the user.

FIG. 2 shows the hardware configuration of the power system monitoring device 10 and the overall configuration of the power system 100. FIG. 2 shows a situation in which electric power is exchanged across a plurality of electric power systems 100a, 100b, 100c. When the power systems 100a, 100b, 100c are not distinguished, they are referred to as the power system 100. FIG. 2 includes, for example, a power supply, a bus bar, a line, a load, a power capacitor, a shunt reactor, a measuring device, a generator, a transformer, a phase adjusting device, etc., but they are omitted as appropriate in the drawing.

In the power system 100, a plurality of devices are connected via a line (branch), a bus (node), a transformer (not shown), and a transformer with taps (not shown). The lines 141ab, 142ab, 141cb, 142cb, 141sc, 142ac may be referred to as the line 140 without distinction. The busbars 120a, 120b, 120c, 121a, 121b, 121c may be called the busbar 120 without distinguishing them.

The devices included in the power system 100 include, for example, a power supply, a load, a power capacitor (SC: Static Condenser), a shunt reactor (ShR: Shunt Reactor), a measuring device (for example, the device 44), and other controllable devices. There is.

Other devices that can be controlled include, for example, batteries, rechargeable secondary batteries, EV storage batteries, flywheels, and other phase adjusting equipment (SVC (Static Var Compensator), SVG (static var compensator). Static C Var Generator: static reactive power generator), LPC (Loop Power Controller: transformer with phase adjuster), etc.). It is not necessary for each power system to be equipped with all of the above devices.

The measuring devices 44a and 44b are illustrated as if they are provided only in the power system 100a in FIG. 2, but the measuring devices may be provided in the other power systems 100b and 100c. When no distinction is made, it is referred to as a measuring device 44. The measuring devices 44 included in each of the power systems 100a to 100c are connected to the communication unit 13 of the power system monitoring device 10 via the communication network CN. The communication network CN may be a communication network using transmission and distribution lines, a communication network using optical fibers, or a wireless communication network.

The power sources included in the power system 100 include, for example, a rotary power source, a distributed power source, and an inverter interconnection power source. The rotary power source is, for example, a thermal power generator, a hydraulic power generator, a nuclear power generator, or the like. The distributed power source is, for example, a solar power generation device, a wind power generation device, or the like. The inverter interconnection power supply is a power supply connected to the power system 100 via an inverter.

Here, the example of the measurement value data D1 is, as described above, the node voltage V, the branch current I, the active power P, the reactive power Q, the power factor Φ, the tap value, the node, the branch, the transformer, the SC, the ShR, and the like. It is any one or a plurality of information such as opening / closing information of the switch. The measurement value data D1 is transmitted to and stored in the measurement value database DB1 via the communication network CN.

The measuring device 44 measures, for example, one or more of each of the above-mentioned measured value data D1 by a voltage transformer (VT: Voltage Transformer) or a voltage transformer (PT: Potential Transformer) or a voltage transformer. It is a flow device (CT: Current Transformer). The measuring device 44 has a function of creating measured value data D1 including, for example, an identifier (ID) for identifying a location where the data is measured, a built-in time stamp of the measuring device, and the created measured value data D1. It has a function of transmitting to 10. The measurement value data D1 can also be generated as, for example, a telemeter (TM: Telemeter) or a supervision (SV: Super Vision).

The measuring device 44 may be a device that measures electric power information (voltage phasor information) with absolute time using GPS, a phase measuring device (PMU: Phase Measurement Units), or another type of measuring device. Furthermore, the measuring device 44 does not need to be provided in the power system 100, and may be installed on the bus 120 or the line 140. That is, the measuring device 44 may be installed on a bus, a line, or the like, which is connected to the power supply, the transformer, the tapped transformer, the load, the power capacitor, the shunt reactor, and the measuring device 44.

In FIG. 2, the measured value data D1 is measured as the data of the electric power system 100a and is not illustrated as being measured from the electric power system 100b or the electric power system 100c, but in the operation of the electric power system A, This is an example assuming that the power system monitoring device 10 is used, and in reality, data from the power system 100b or the power system 100c may be received.

The measurement value database DB1 of the power system monitoring device 10 can directly receive the measurement value data D1 from each measurement device 44 via the communication network CN, or can indirectly receive the measurement value data D1 via another device. it can. For example, the measurement value data D1 may be sent to the setting value database DB2 via the communication network CN after being once collected by another monitoring device. Alternatively, the measurement value data D1 may be received by the measurement value database DB1 from the measurement device 44 or another monitoring device via the communication network CN. The other monitoring device is, for example, a central power supply command station, a system power supply command station, a backbone system power supply command station, a local power station, or a system stability monitoring server (all not shown).

The configuration of the power system monitoring device 10 will be described. The power system monitoring device 10 includes, for example, a display unit 11, an input unit 12, a communication unit 13, a microprocessor (CPU: Central Processing Unit) 14, a memory 15, a measurement value database DB1, a set value database DB2, and an operation allowable value calculation result. It includes a database DB4, a difference calculation result database DB5, an operation allowable value selection result database DB6, and a program database DB7, and the respective constituent elements 11 to 15 and DB1 to DB7 are connected by a bus BL. The microprocessor 14 may be configured as a computer or a computer server.

The display unit 11 is a device for providing information from the power system monitoring device 10 to a user such as an administrator or an operator. The display unit 11 can be configured as a display device, for example. Instead of the display device or together with the display device, the display unit 11 may be configured by using a printer device, a voice output device, or the like. Alternatively, the display unit 11 may include an interface that outputs information to another device (not shown). The display unit 11 can also be called an “information providing unit”.

The input unit 12 is a device for inputting information or instructions from the user to the power system monitoring device 10. The input unit 12 can be configured to include, for example, at least one of a keyboard switch, a pointing device such as a mouse, a touch panel, and a voice instruction device.

The communication unit 13 is a device including a circuit for connecting to the communication network CN and a communication protocol.

The CPU 14 reads and executes a predetermined computer program from the program database DB7. The CPU 14 may be configured as one or a plurality of semiconductor chips, or may be configured as a computer device such as a calculation server.

The memory 15 is configured as a RAM (Random Access Memory), for example. The memory 15 stores a computer program read from the program database DB7 and stores calculation result data and image data necessary for each process. The screen data stored in the memory 14 is sent to the display unit 11 and displayed. An example of the displayed screen will be described later.

The storage contents of the program database DB7 will be described with reference to FIG. In FIG. 3, the program database DB7 stores, for example, an operation allowable value calculation program P10, a difference calculation program P11, an operation allowable value selection program P12, and an output program P13.

Return to Figure 2. The CPU 14 executes the calculation program (operation allowable value calculation program P10, difference calculation program P11, operation allowable value selection program P12, output program P13) read from the program database DB7 to the memory 14 to calculate the operation allowable value. , Difference calculation, operation allowable value selection, instruction of image data to be output, and data search of each database.

The memory 14 is a memory for temporarily storing output (display) image data, measurement value data D1, setting value data D2, temporary data used in each calculation, and calculation result data in each calculation. The CPU 14 generates image data necessary for output and displays it on the display unit 11 (for example, a display screen).

An output unit for providing information to the user (image data for managing the operation allowable value) and an output unit for performing maintenance of the power system monitoring device 10 may be separated. That is, the information to be provided to the user may be displayed on a computer terminal that is configured separately from the power system monitoring device 10. The power system monitoring device 10 may be provided with an output unit for rewriting each computer program or database. The computer terminal that provides information to the user may be a desktop, notebook, or tablet personal computer, or a personal digital assistant (including a so-called smartphone). Instead of a normal two-dimensional screen, VR (Virtual Reality: Virtual Reality), AR (Augmented Reality), MR (Mixed Reality: Mixed Reality) may be used.

The power system monitoring device 10 roughly stores six databases. Except for the program database DB7, the measurement value database DB1, the setting value database DB2, the operation allowable value calculation result database DB4, the difference calculation result database DB5, and the operation allowable value selection result database DB6 will be described.

The measurement value database DB1 includes measurement value data D1. As described above, the measured value data D1 includes active power P, reactive power Q, voltage V, frequency, voltage phase angle δ, current I, power factor Φ, tap value, power system and node or branch or transformer or SC. It also includes switching information of switches provided between the switch and ShR, time information, weather conditions, air temperature, wind speed, solar radiation amount, load current value, electric wire temperature, ambient temperature, telemeter information, supervision information, and the like.

The measurement value data D1 may be time stamped data or PMU data. For example, the voltage and the voltage phase angle at the node 120 connected to the power system 100, the line current (I) or the line flow (P + jQ) of the branch 140 connected to the node 120 connected to the power system 100, and the connection to the power system 100. Line current (I) or line current (P + jQ) of a transformer or a transformer with a tap connected to the node 120, the voltage V and the voltage phase angle δ of the node 121 connected to the transformer, and the power supply connected to the node 121. Voltage V and current I, active power P, reactive power Q and power factor Φ, load voltage V and current I, active power P, reactive power Q and power factor Φ, measuring device 44 and other monitoring devices From other nodes or branches connected to the power system 100 to be measured via the communication network, power supply, load, control device, etc., voltage V, current I, active power P, reactive power, etc. Such as power Q, power factor Φ, voltage V and voltage phase angle δ, tap value of transformers and transformers with taps, and switching information of switches between nodes, branches, transformers, SC, ShR, etc. Any one or more are stored. The voltage phase angle δ may be measured using another measuring device using PMU or GPS.

The measuring device 44 is VT, PT, CT, TM, SV information and the like. The line power flow (P + jQ) can be calculated from the current I, the voltage V, and the power factor Φ measured by VT, PT, or CT. The measurement value data D1 may be obtained from the monitoring control device, the central power feeding command center, EMS, or directly from the measurement device of the entire system.

In the set value database DB2, as set value data D2, active power P, reactive power Q, voltage V, voltage phase angle δ, current I, power factor Φ, tap value, turning on / off of the switch as shown in FIG. Operation information, operation target value, operation upper and lower limit value, constraint condition, threshold value, margin, filter time constant, discretization condition, operation allowable set time, allowable current calculation condition, line configuration, line resistance, line type, system configuration, It includes system topology, line constants, generator constants, system data, etc.

FIG. 7 shows an example of the set value data D2. In the set value data D2 shown in FIG. 7, the number is divided by "i" for each location and described without any change depending on the time zone. i = 1 is described as an example between the power systems A (reference numeral 100a) and B (reference numeral 100b), and i = 1 is described as an example between the power systems A (reference numeral 100a) and C (reference numeral 100c). is doing. Instead of this, it may be changed every hour or every season. Pdij in FIG. 7 indicates the operation allowable value of the jth stage. Pdijε indicates the margin of the operation allowable value at the j-th stage.

When using a filter for setting the set value D2, the filter time constant may be saved as a part of the set value data D2. Note that the measurement value data D1 is time-series data of measurement values such as PQVF, so description thereof will be omitted.

The set value data D2 further includes each node obtained by power flow calculation using the system configuration, line impedance (R + jX), ground capacitance (admittance: Y), power supply data, power generation plan and load demand forecast value. It also includes time series data (predicted value) such as the voltage, active power, and reactive power. The system configuration includes one or a plurality of connection relationships among a bus 120, a line 140, a power supply, a load, a transformer, and each control device of the system.

The measurement value data D2 may be obtained from the monitoring control device, the central power supply command station, EMS, or manually input. When manually inputting the measured value data D2 to the power system monitoring device 10, the user inputs it using the input unit 12 and stores it in the database DB2. When the user manually inputs the set value data D2, the CPU 14 generates a screen for manual input and displays it on the display unit 11. When setting a large amount of the set value data D2, the set value data D2 may be semi-automatically input by using a complementary function at the time of input.

The operation allowance calculation result database DB4 stores operation allowance calculation result data D4 (also referred to as an operation allowance D4). The calculation result data D4 of the operation allowable value includes, for example, current capacity calculation, dynamic rating calculation, heat capacity calculation, state estimation calculation, power flow calculation, optimum power flow calculation, transient stability calculation, steady state stability calculation, voltage stability calculation. , Frequency stability calculation, cascading calculation, islanding calculation, transmission rules between electric power companies, and the like, which include operation constraints calculated from any one or a plurality of them. These data may be stored in the database DB4 using the input unit 12 of the power system monitoring device 10, or may be stored in the database DB4 from other monitoring devices. Alternatively, the result calculated using the measurement value data D1 and the setting value data D2 may be set in the database DB4 as a settling value.

The difference calculation result database DB5 includes, as difference calculation result data D5, the result of the difference calculation between the operation allowable value D4 which is the operation allowable value candidate and the set value D2.

The operation allowance value selection result database DB6 includes the operation allowance value D6 to be output, which is selected based on the difference calculation result D5 as the operation allowance value selection result data D6.

The calculation processing contents of the power system monitoring device 10 will be described with reference to FIG. FIG. 4 is an example of a flowchart showing the overall processing of the power system monitoring device 10. I will briefly explain the flow.

The power system monitoring device 10 calculates the operation allowable value D4 using the measured value data D1 and the set value data D2 (S30). The operation allowable value calculation result D4 is stored in the operation allowable value calculation result database DB4.

The power system monitoring device 10 calculates the difference D5 using the calculated allowable operation value D4, the measured value data D1, and the set value data D2 (S40). The calculated difference D5 is stored in the difference calculation result database DB5.

The power system monitoring device 10 executes the calculation for selecting the operation allowable value D6 to be output from the operation allowable value D4 calculated in step S30, the difference D5 calculated in step S40, and the set value data D2. Yes (S50). The operation allowable value selection result D6 is stored in the operation allowable value selection result database DB6.

The power system monitoring device 10 causes the display unit 11 to output at least one of the measured value data D1, the set value data D2, the operation allowable value D4, the difference D5, and the operation allowable value selection result data D6 (S60). ). In the present embodiment, a case will be described as an example where any one or more or all or all of the data D1, D2, D4 and D5 are displayed on the screen.

The various calculation results and the data accumulated in the memory 15 during the calculation may be sequentially displayed on the screens of other monitoring devices. As a result, the user can easily understand the operation status of the power system monitoring device 10. Details of the above steps are described below.

In step S30, the power system monitoring device 10 uses the measured value data D1 and the set value data D2 to calculate the operation allowance value, and stores the operation allowance value D4 as the result in the operation allowance value calculation result database DB4. To do. The operation allowable value D4 is calculated using the operation restriction of the power system included in the setting value data D2. The operational constraints include, for example, current capacity calculation, dynamic rating calculation, heat capacity calculation, state estimation calculation, power flow calculation, optimum power flow calculation, transient stability calculation, steady state stability calculation, voltage stability calculation, frequency stability calculation, and cascade calculation. It is set from one or more of a ding calculation, an islanding calculation, and a transmission rule between electric power companies.

When the measured value data D1 and the set value data D2 are not preset, the data D1 and D2 may be input to the power system monitoring device 10 using the input unit 12 and the display unit 11. The data D1 and D2 may be input to the power system monitoring device 10 from another monitoring device through the communication network CN and the communication unit 13. The power system monitoring device 10 may automatically receive and store data relating to the data D1, D2, D4, D6 held in another monitoring device or the like at a constant cycle. When the data D1, D2, D4, D6 are set in advance, correction may be added or the set data may be used.

Details of step S30 will be described with reference to FIGS. 5 and 8. In this example, a case where the operation allowable value is set in a plurality of stages (for example, the first stage and the second stage here) will be described. Even when the number of stages is three or more, it can be dealt with by expanding the flowchart of FIG.

The operation allowable value calculation unit 31 of the power system monitoring device 10 reads the measured value data D1 and the setting value data D2 (S31), and calculates the operation allowable value (S32). In the flowchart, the code OT is given to the calculated operation allowable value.

The operation allowable value calculation unit 31 calculates the difference ΔP between the calculated operation allowable value OT and the set value D2 (S33), and determines whether the difference ΔP is 0 or more (S34). When there is a difference ΔP (S34: YES), the operation allowance value calculation unit 31 determines whether the operation allowance value OT calculated in step S32 is the first-stage setting value (S35).

When the operation allowance value OT is the setting value of the first stage (S35: YES), the operation allowance value calculating unit 31 waits until the set time Tup elapses (S36). When the set time Tup has elapsed (S36: YES), the operation allowance value calculation unit 31 changes the operation allowance value OT (S37) and initializes the value of the counter that counts the set time (S38). If "NO" is determined in step S35, or if "NO" is determined in step S36, the process returns to step S31.

On the other hand, when the difference ΔP calculated in step S33 is 0 or less (S34: NO), the operation allowance value calculation unit 31 determines whether the operation allowance value OT calculated in step S32 is the second-stage setting value. The determination is made (S35b). Then, the operation allowable value calculation unit 31 waits until another set time Tdown elapses (S36b). When another set time Tdown has elapsed (S36b), the process proceeds to step S37. When it is determined to be "NO" in either step S35b or step S36b, the process returns to step S31.

In step S32, the operation allowable value OT is calculated by inputting the temperature in the DR calculation, for example. Not limited to this, in step S32, the operation allowable value may be calculated by calculating the system stability. In this embodiment, the operation allowable value is calculated and changed in order to maintain the system stability. The normal DR attempts to use the operation allowance up to the limit, which is different from the calculation of the operation allowance in this embodiment.

Here, an example of graphs and screens will be explained first. FIG. 8 shows an example of the calculation result of the operation allowable value selection process (S50). Basically, the strict operational allowance, that is, the minimum operational allowance is displayed. When it is determined that there is a margin, the operation allowance is relaxed. Here, a white circle indicating the calculation result of the operation allowable value and a black circle indicating a measurement value described later are different plot points. As a result, it is possible to flexibly change the operation when the operation allowable value is relaxed.

In the first embodiment, with respect to the operation allowance value dynamically calculated for one route, which operation allowance value should be displayed among the preset j operation allowance values (Pd11, Pd12) is selected. And output.

As shown in the upper part of FIG. 8, since “Pd12ε” is set as the operation allowance, it is possible to select the operation allowance with a margin. As indicated by ΔP12 (t6) on the upper side of FIG. 8, the time Tup1 is set so as not to change the operation allowable value with a slight change. On the other hand, in order to increase the sensitivity by tightening the operation allowable value, it is possible to set a time to change immediately, such as time Tdown1 (<Tup1).

FIG. 9 shows an example of the calculation result of the operation allowable value calculation process (S30). As a means different from the means described in FIG. 8, a digital filter (low-pass filter (LPF, moving average filter), high-pass filter (HPF, moving difference filter), or band-pass filter (BPF)) may be used. By outputting the operation allowable value using these filters, it is possible to remove the instantaneous variation.

By combining the method described in FIG. 9 and the method described in FIG. 8, as shown in the graph of the calculation result of the operation allowable value in FIG. 10, the limit of the operation allowable value is set to “Pd12” and displayed. You can also As a result, it is possible to avoid excessively optimistic operation.

FIG. 11 shows an example of the calculation result of the operation allowable value calculation process (S30). As shown in FIG. 11, the result of the filter processing described in FIG. 9 can be displayed with a coarser update period (discretized). As a result, it is possible to suppress frequent changes in the operation allowable value.

The roughness of the update cycle of the operation allowable value can be changed arbitrarily. As a result, it is possible to set the update cycle suitable for the user, and the usability for the user is improved. The update cycle may be set to, for example, a 10-second cycle according to real-time DR calculation. When calculating the update cycle, calculation of system stabilization that appears periodically (for example, every 5 minutes) may be taken into consideration. Even if the operation allowable value calculation cycle is delayed, the methods described in FIGS. 8 to 11 can be applied as they are.

12 to 14 are examples of calculation results of the operation allowable value selection process (S50). FIG. 12 is an example in which the difference between the measured value and the operation allowable value is calculated with respect to the selection result of the operation allowable value (using the result of FIG. 8). Only the representative three points are shown as the difference ΔP. Select the axes in order of increasing difference. When the difference is smaller than the threshold value Piε, it may be forcibly displayed in multiple dimensions, or may be displayed using a plurality of two-dimensional graphs as shown in FIG. By displaying the operation allowable value by these methods, it is possible to realize monitoring without omission.

In FIG. 13, the paths from the electric power system A to the electric power system B and the paths from the electric power system A to the electric power system C are indicated by reference numerals 1P, 2P, 1Q, and 2Q. Each evaluation axis 1P, 2P, 1Q, 2Q indicates an axis for evaluating the PQVF or the like of the operation monitoring target of each path, and they are all different. By the processing of FIG. 12, an important evaluation axis (for example, the axis to be monitored now) can be selected as an axis for evaluating the operation allowable value of the output target from among these axes 1P, 2P, 1Q, 2Q.

FIG. 15 shows an example of a system diagram screen G1 displaying a system diagram. On the screen G1, all nodes or measurement points on the map may be connected by lines. At that time, by adopting a skeleton method, it is possible to prevent the visibility of the map from being impaired. Further, when the user uses a pointing device such as a mouse to select an element (device, path) included in the system, detailed information of the selected element can be displayed on the screen G1. The detailed information may be displayed in the screen G1 or may be displayed by opening another screen.

FIG. 16 shows an example of the system monitoring screen G2 in the first embodiment. FIG. 17 shows an example in which the operation locus of the system monitoring screen G2 is displayed.

An important evaluation axis is assigned as a monitoring target to the vertical axis (Y axis) and horizontal axis (X axis) of the nomogram in the figure. In the illustrated example, the path 1P is displayed on the Y axis and the path 2P is displayed on the X axis. The user can change the axis displayed on the left side of the screen G2 by selecting a desired path name from the path names displayed on the upper right of the screen G2 by clicking or the like.

Screen G2 can also play back the results of past system monitoring. For example, the state of past system monitoring can be displayed on the screen G2 by tracing back a predetermined period or a period designated by the user. You may be able to trace the trajectory of change with a line. This makes it possible to represent a time series tendency on a plane.

The screen G2 shows one nomogram, but the present invention is not limited to this, and a plurality of nomograms may be displayed. In order to indicate to the user that the nomogram is updated according to a predetermined method, for example, the time displayed on the upper right of the screen G2 may be blinked. A graph for showing the change in the operation allowable value may be displayed on the screen G2 or another screen.

In FIG. 16, the operation constraint information is shown in a two-dimensional plan view (nomogram format), but it is not limited to this. If there is only one important axis, it may be displayed as a two-dimensional time series waveform. It can also be displayed in a three-dimensional nomogram format, or can be displayed as a one-dimensional numerical value only. Furthermore, the nomogram is not limited to the case of being represented by a rectangle.

Although “M minutes ago” is written in the lower right corner of the screen G2, the screen G2 may be managed in seconds or in hours.

FIG. 18 shows an example of the operation allowable value calculation result screen G3 in the first embodiment. White circles in the graph on the upper side of the screen G3 indicate the calculation result of the operation allowable value. The solid line on the lower side of the screen G3 shows the output result of the operation allowable value. Although not shown, the difference calculation result of the vertical axis ΔP12 (t) and the time counter can also be displayed as a graph.

Return to Figure 4. In step S40, a difference is calculated using the operation allowable value calculation result data D4, the measured value data D1, and the set value data D2 stored in step S30, and the result is stored in the operation allowable value calculation result database DB4.

In step S50, the operation allowable value to be output is selected using the operation allowable value calculation result data D4 stored in step S30, the difference calculation result data D5 and the set value data D2 stored in step S40, The selection result D6 is stored in the operation allowable value selection result database DB6.

Details of steps S40 and S50 will be described with reference to FIG. The difference calculation unit 32 of the power system monitoring device 10 uses the operation allowable value D4 (displayed as the operation allowable value OT in FIG. 5) that is the calculation result of the operation allowable value calculation unit 31, the measured value data D1, and the set value data D2. And are read (S41), and the difference is calculated (S42). The difference calculation unit 32 determines whether the difference calculated in step S42 is the last axis (index) of the plurality of monitoring target axes (index) included in the operation constraint information (S43). Steps S41 and S42 are repeated until the differences are calculated for all monitored axes (S43: NO).

When the difference calculation unit 32 calculates the differences for all monitored axes (S43: YES), the operation allowable value selection unit 33 sorts the calculated differences (S51) and outputs the sorted results based on the sorted results. A target operation allowable value is selected (S52). The selected operation allowable value D6 is stored in the database DB6.

In step S51, the differences can be sorted in ascending or descending order. By rearranging, it is possible to easily detect a portion with a small difference (a portion with no margin, a severe portion) and a portion with a large difference (a portion with a margin). A place where the difference is small is a place where there is no margin. For a portion where the difference is smaller than the predetermined set value ε, that effect is displayed on the screen of the display unit 11. As a result, it is possible to assist the user in monitoring the severe location.

In this embodiment, both a small difference part and a large difference part can be displayed on the screen of the display unit 11. As a result, it is possible to improve both the degree of recognition of a strict location with no margin and the degree of recognition of a location with margin for the user.

Return to Figure 4. In step S60, the measured value data D1, the set value data D2, the operation allowable value calculation result data D4 stored in step S30, the difference calculation result data D5 stored in step S40, and step S60 are used to monitor the state of the power system. At least one of the operation allowable value selection result data D6 stored in S50 is displayed on the screen of the display unit 11.

Each calculation result or the data accumulated in the memory during the calculation may be sequentially displayed on the screen of another monitoring device. This allows the user to easily understand the operating status of the power system monitoring device 10.

According to the present embodiment configured as described above, even if the power flow state or operation of the system changes frequently and complicatedly, it is possible to monitor in response to the change, so that reliability is maintained. At the same time, the usability for the user can be improved.

In the present embodiment, even if the measured value D1 changes momentarily like noise, the operation allowable value output on the screen can be gently changed. Therefore, the user can calmly monitor and operate the system without being rushed to deal with the rapidly changing measurement value D1. As a result, the usability of the user can be improved and the system can be stabilized and economically operated.

Example 2 will be described with reference to FIGS. 19 to 23. Each of the following embodiments including this embodiment corresponds to a modification of the first embodiment, and therefore the differences from the first embodiment will be mainly described.

In this embodiment, in addition to the measured value data D1 and the set value data D2 in the first embodiment, priority data D8 is added as input data. As a result, in this embodiment, the operation allowable value selected in step S50 can be adjusted according to the priority. As a result, it is possible to provide the power system monitoring device 10A that is convenient for the user.

In the present embodiment, the effect of weighting can be confirmed by calculating both with and without priority weighting.

FIG. 19 is an overall configuration diagram of the power system monitoring device 10A of the present embodiment. Comparing the power system monitoring apparatus 10A of the present embodiment with the power system monitoring apparatus 10 described in FIG. 1, the priority data D8 is added to the input data D40 of the power system monitoring apparatus 10A, and the operation allowable value. The difference is that priority data D8 is added to the data used in the selection unit 33A.

FIG. 20 shows the overall configuration including the hardware configuration of the power system monitoring device 10A of this embodiment. A priority database DB8 is added to the power system monitoring device 10A. The priority database DB8 manages the priority data D8.

The priority data D8 will be described with reference to FIG. The priority data D8 is a weight for the difference between the evaluation axes. The priority is determined using, for example, one or more of operation information, area information, system information, weather information, operation restrictions, and the like. FIG. 21 is an example of the priority data D8, and the weight of each axis in each time zone is set, but it is not necessary to set the priority data D8 for each time zone.

The flowchart of FIG. 22 shows the processing of the difference calculation unit 32 and the processing of the operation allowable value selection unit 33 of the power system monitoring device 10A according to the present embodiment.

Steps S41 to S43, S51, and S52 are the same as those in the flowchart described with reference to FIG. 6, but in the present embodiment, the difference D5 is further weighted by the priority data D8, and the rearrangement (S53) is performed. The operation allowable value D6 to be output is selected based on the difference D5 weighted by D8 (S54).

That is, the power system monitoring device 10A of the present embodiment allows the operation allowance D6 (S51, S52) of the output target based on the difference D5 that is not weighted and the operation allowance of the output target based on the difference D5 weighted by the priority data D8. A plurality of types (two types) of operation allowable values to be output with the value D6 (S53, S54) are selected.

Note that, in FIG. 22, for convenience, steps S51 to S54 are illustrated as if they are performed in order, but steps S51 and S52 and steps S53 and S54 can be performed in parallel.

FIG. 23 is an example of a system monitoring screen G2A displayed on the display unit 11. Comparing the screen G2A of FIG. 23 with the screen G2 described in FIG. 16, the screen G2A of the present embodiment is different in that the operation allowable value is displayed in consideration of the priority data D8.

In the example of the screen G2A, the path 3P is weighted with “0.3” and the paths 1P and 2P are weighted with “1.0”. In the screen G2A, the table shown in the upper right can sort the differences in ascending order or descending order in each of the case where the priority is considered (Yes) or the case where the priority is not considered (No).

Furthermore, when the user operates the priority information button G2A1 on the screen G2A, information that is the basis of the priority D8, such as weather information, is displayed.

In the present embodiment, the user selects either one of displaying the operation allowance in consideration of the priority D8 or displaying the operation allowance without considering the priority D8. You can Therefore, according to the present embodiment, in addition to the operational effects of the first embodiment, the user can further determine whether or not to use the priority, so that the usability is further improved and stable system monitoring is performed. be able to.

Example 3 will be described with reference to FIGS. 24 to 31. The power system monitoring device 10B according to the present embodiment not only monitors the power system but also calculates and displays improvement measures to support user operation.

FIG. 24 is an overall configuration diagram of the power system monitoring device 10B of the present embodiment. Comparing the power system monitoring apparatus 10B of the present embodiment with the power system monitoring apparatus 10 described in FIG. 1, the point that the improvement measure calculation unit 34 is added to the calculation unit 41 and the improvement data calculation result data in the result data D42. The difference is that a remedy calculation result database DB9 that stores D9 is added.

FIG. 25 is an overall configuration diagram including the hardware configuration of the power system monitoring device 10B of the present embodiment. The improvement plan calculation result database DB9 is added to the power system monitoring device 10B of the present embodiment. Further, in the power systems 100a and 100c, the power source 110, the transformers 130 and 131, the load 150, and the phase adjusting equipment 160 and 170, which are calculation targets, are added. Here, the description will be made by omitting the alphabetical suffix from the symbols such as the power source.

FIG. 26 is a configuration diagram showing the contents of the program database DB 7B of the power system monitoring device 10B. The program database DB7B differs from the program database DB7 described with reference to FIG. 3 in that an improvement measure calculation program P14 is added.

FIG. 27 is a flowchart showing the overall processing of the power system monitoring device 10B in this embodiment. The flowchart of FIG. 27 differs from the flowchart of FIG. 4 in that a step S70 for calculating improvement measures is added between steps S50 and S60.

Details of the improvement measure calculation processing (S70) will be described using the flowchart of FIG. The improvement measure calculation unit 34 of the power system monitoring device 10B acquires the measurement value D1, the set value D2, the calculated operation allowable value D4, and the selection result D6 of the operation allowable value selection unit 33 (S71), Based on the acquired data, improvement measures for the power system are calculated (S72).

The improvement measure calculation unit 34 repeats steps S71 and S72 until the final case is calculated (S73: NO). When the improvement measure calculation unit 34 has calculated for all cases (S73: YES), the improvement measure calculation unit 34 presents the calculated improvement measures to the user (S75). The user can select one or a plurality of improvement measures to be executed from the presented improvement measures. The improvement measure calculation unit 34 can also select an improvement measure according to some selection criterion and inquire the user about whether or not to adopt the selected improvement measure.

The reason why the final case is determined in step S73 is that there may be a plurality of cases of the data D40 input to the improvement measure calculation unit 34. If there is only one improvement measure calculated in step S72, then in step S75, it is determined whether or not there is no problem with the only improvement measure.

If there are multiple improvement measures, by sorting by the improvement effect index (the amount of operation of the controlled device is the smallest, the deviation from the other person's current setting, etc.) when each improvement measure is executed, It can be useful in determining improvement measures.

In step S75, a plurality of improvement measures may be presented to the user, or only one improvement measure may be presented. When a plurality of solutions (improvement measures) are presented, the user can select and execute a favorite solution from the presented solutions. When only one solution is presented, the user can easily understand the most effective solution from the calculated improvement measures.

FIG. 29 is an explanatory diagram showing the appearance of the decision result of the improvement measure. An example of the case where the control A is executed as the first improvement measure will be described. Black circles indicate operating points, and white circles indicate a state before M minutes. A black triangle mark indicates a state after the control A is performed. The solid line is the operation allowable value. From FIG. 29, it can be seen that the difference from each operation allowable value increases by implementing the improvement measure (control A). The calculation method of the first improvement measure will be described later.

FIG. 30 is an explanatory diagram showing the appearance of the decision result of the second improvement measure. An example of the case where the control B as the second improvement measure is executed will be shown. Since the control A, which is the first improvement measure, can be directly controlled, the effect when the control A is implemented can be displayed on the nomogram. Therefore, the user can easily determine which improvement measure should be implemented.

On the other hand, the control B as the second improvement measure cannot be directly controlled, but can be controlled by the power system C. Therefore, if the improvement measure (control B) is executed, the system state is analyzed, and the analysis result is presented to the user as the operation target value, whereby the guideline can be shown to the user. This guide can also be communicated to the user of the power system C. By sharing the screen of FIG. 30 among users who operate each power system, common understanding can be easily fostered.

Explain the calculation of improvement measures. There are two basic forms of improvement measures.

(1) First improvement measure

The first improvement measure is an improvement measure that directly controls the control target equipment within its own jurisdiction (for example, power system A). In step S72, a solution (operation amount: control A) is obtained by solving the optimum power flow calculation (OPF) under the following conditions. Objective function (evaluation function): max Σwi * (ΔPi) where wi is the weight and ΔP is the deviation between the operating point and the operation allowable value.

The first improvement measure aims to increase the margin of the operating point. In the evaluation function, it may be possible to target only the evaluation axis selected by the operation allowable value selection unit 33. However, since the operating points of the evaluation axes that have not been selected may deteriorate, the weights of the evaluation axes that have not been selected are also reduced and included in the evaluation function. As a result, it is possible to suppress hunting in which some axis is deteriorated.

In the first improvement measure, the equipment to be controlled (Pg, Qg, Vg, tap value, phase adjustment CB on / off, etc.) within its own jurisdiction is used as the operation variable, and the equipment operation constraint (eg tap) is used as the constraint. Moves within this value, etc.).

FIG. 29 shows the predictive effect of control A by calculating the power flow when control A is executed. By displaying the improvement effect on the screen as shown in FIG. 29, the user can easily understand the improvement effect.

(2) Second improvement measure

The second improvement measure is an improvement measure to indirectly control the control target equipment in another jurisdiction (for example, power system B) when the control target equipment in its own jurisdiction is insufficient or cannot be controlled. In step S72, the solution (operation amount: control B) as the second improvement measure is obtained by solving the optimum power flow calculation (OPF) according to the following conditions.

The objective function (evaluation function) is as described in the first improvement measure. The controlled variable equipment (Pg, Qg, Vg, tap value, phased CB on / off, etc.) in other jurisdiction is used as the manipulated variable. The restrictions are as described in the first improvement measure.

▽ Here, Control B, which is the second improvement measure, cannot be directly controlled because it is controlled equipment under other jurisdiction. Therefore, an ideal operational target value (range on the nomogram) with another jurisdiction area is obtained by calculating the power flow assumed when the control B is performed. Then, it is possible to indirectly control by transmitting this ideal operation allowable value to the user in another jurisdiction.

In FIG. 30, the operation target value is displayed as a nomogram on the screen so that the user is in control of another jurisdiction (eg, user of power system B, power generation operator of power system A, different voltage class of power system A). The target can be easily communicated to the user who is doing this). As a result, it is possible to share information among related parties and appropriately grasp the status of the power system.

The improvement measures can also be calculated by combining the methods described in the first improvement measure and the second improvement measure described above. In the above OPF calculation, it is assumed that the system models of the power system A and the power system B are known, but the power system B may be an integrated model.

FIG. 31 is an example of the operation support screen G4. The user can easily understand the relationship between the operation target value and the operation allowable value through the screen G4, and the usability for the user is improved.

According to the present embodiment, as described in the first embodiment, the user can easily confirm the important operation allowance value, operation target value, and improvement measure, so that the power flow state and the operation form change more complicatedly and frequently. Even if you do, you can respond.

Here, as shown in the screen G4, when the user selects the "operation support" tab menu, the screen G4 shows what improvement measures should be taken for the system monitoring result. FIG. 31 shows an example of the second improvement measure. The user can confirm the details of the OPF in the calculation result column on the upper right.

The user can also confirm the first improvement measure. Therefore, the user can display and confirm both the first improvement measure and the second improvement measure, and can consider which improvement measure should be implemented.
The second improvement measure shows the result when it is assumed that the equipment of system C is operated based on the OPF. Therefore, for the users of system A, the second improvement measure is only prediction. However, there is an effect that the user can know that this target value can be presented, and the range of operation methods is expanded.

By displaying the effect index calculated in the flowchart of FIG. 28 on the screen G4, the user can easily compare the effects when the respective improvement measures are implemented, and the usability is improved. The predicted value (calculated value) after implementing the improvement measure may be displayed on the screen G4.

Example 4 will be described with reference to FIGS. 32 to 35. In the present embodiment, the operation of the user is supported by adding the command unit 35 to the configuration of the third embodiment.

FIG. 32 is an overall configuration diagram of the power system monitoring device 10C of the present embodiment. Compared with the power system monitoring device 10B described in FIG. 24, the power system monitoring device 10C according to the present embodiment is added with a command unit 35 and a command result database DB10 that stores command result data D10. different.

The command unit 35 has a function of selecting an improvement measure specified by the user from the calculated improvement measures. There are the following plural command methods (selection methods). The first method is a method in which the user manually selects an improvement measure that he / she likes. The second method is a method of automatically selecting using a calculated effect index or the like. The improvement measure candidate to be selected may be extracted from the effect index or the like, and the user may manually select from the extracted improvement measure candidates.

FIG. 33 is an overall configuration diagram including the hardware configuration of the power system monitoring device 10C of the present embodiment. The power system monitoring device 10C of the present embodiment differs from the power system monitoring device 10B of FIG. 25 in that a command result database DB10 is added. An individual control device 45a is additionally added to the power system A (100a). The individual control device 45a can be controlled only under its own control (here, the power system A).

FIG. 34 is a configuration diagram showing the contents of the program database DB7BC of the power system monitoring device 10C. The program database DB7C is different from the database DB7B described in FIG. 26 in that a command program P15 is added.

FIG. 35 is a flowchart showing the overall processing of the power system monitoring device 10C according to the present embodiment. This flowchart is different from the flowchart described in FIG. 27 in that a step S80 for selecting and issuing an improvement measure is added between steps S70 and S60.

In step S70, the first improvement measure (control A in the above example) that the user directly controls can be selected and instructed from the improvement measures displayed on the screen (not shown) of the display unit 11. .. Alternatively, in step S70, the user confirms the operation target value displayed on the screen and informs the user who operates another power system of the second improvement measure (control B in the above example). Implementation can also be instructed.

Although illustration is omitted, for example, by making it possible to display a command screen and a screen for checking the command result, the user can easily operate the device, contact other users, check the command result, etc. It can be done and the usability is improved. This embodiment, which is configured in this way, has the same effects as the third embodiment, and in addition, an improvement measure can be easily selected and commanded.

Example 5 will be described with reference to FIGS. 36 to 40. In the power system monitoring device 10D of the present embodiment, not only the power system monitoring but also the operation allowable value can be evaluated and displayed. As a result, in this embodiment, it is possible to realize the operation support of the user, improvement of stability or operability, and reduction of settling labor.

FIG. 36 is an overall configuration diagram of the power system monitoring device 10D of the present embodiment. The power system monitoring apparatus 10D of the present embodiment is different from the power system monitoring apparatus 10 described in FIG. 1 in that the operation allowable value evaluation unit 36 is added to the calculation unit 41 and the operation allowable value evaluation is performed on the result data D42. The difference is that the operation allowable value evaluation result database DB11 for managing the result data D11 is added.

FIG. 37 is an overall configuration diagram including the hardware configuration of the power system monitoring device 10 of the present embodiment. The power system monitoring device 10D is different from the configuration described in FIG. 2 in that an operation allowable value evaluation result database DB11 is added.

FIG. 38 is a configuration diagram showing the contents of the program database DB 7D of the power system monitoring device 10D. The program database DB7D of the present embodiment is different from the program database DB7 described in FIG. 3 in that a program P16 for evaluating the operation allowable value is added.

FIG. 39 is a flowchart showing the overall processing of the power system monitoring device 10D in this embodiment. Comparing the flowchart of this embodiment with the flowchart described in FIG. 4, in the flowchart of this embodiment, step S20 of setting calculation conditions, step S70D of determining whether or not it is the final case, and the operation allowable value are evaluated. The difference is that step S90 to be performed is added.

The power system monitoring device 10D sets a calculation condition (S20), calculates an operation allowable value D4 according to the set calculation condition (S30), and calculates a difference D5 from the calculated operation allowable value D4 and the set value D2. Calculate (S40).

The power system monitoring device 10D selects the operation allowable value D6 to be output based on the measured value D1, the operation allowable value D4, and the difference D5 (S50). The power system monitoring device 10D returns to step S20 until the final case is determined (S70D: NO).

When the power system monitoring device 10D is determined to be the final case (S70D: YES), the operation allowable value is evaluated (S90), and the evaluation result and the like are output to the display unit 11 (S60).

As described above, the operation allowable value evaluation unit 36 uses the input data D40 and the calculation results of the calculation units (or selection units) 31 to 33 to determine what kind of operation allowable value the user should set. The evaluation value that is the material of is calculated and presented to the user.

The operation allowable value evaluation unit 36 can analyze the calculation results of the calculation units 31 to 33 as online data, or can analyze from the past data, for example, every certain period (several months, etc.). As a result, the operation allowance value evaluation unit 36 can calculate the evaluation axis of the operation allowance value to be displayed on the nomogram in set time units, and present the user with a value obtained by statistically analyzing the calculation result as an evaluation value.

By visually recognizing the presented evaluation result, the user can statistically collect information such as which time zone, which season, what kind of evaluation axis is in a harsh condition, and vice versa. Can be confirmed. Therefore, when the user sets the operation allowable value, the user's judgment can be supported, and the user's usability is improved.

In the present embodiment, not only statistically focused values such as ± σ, ± 2σ, and ± 3σ, but also outliers can be accumulated. Thus, in what kind of system status, whether or not an operation allowable value different from usual is calculated or selected is fed back to the power system monitoring device 10D or the system of each power system. You can also

As a method of evaluating the operation allowable value, two methods, that is, a method of calculating the measured value data D1 online and a method of calculating from the accumulated past data have been exemplified, but instead of these, for example, Pseudo-section data may be created by assuming a system section from a duration curve or the like. Also in this case, the same calculation and evaluation as those of the above-mentioned methods are possible.

FIG. 40 is an explanatory diagram showing a manner of presenting the evaluation result of the operation allowable value and the like. The power system monitoring device 10D according to the present embodiment calculates an operation allowance value for each set time and performs various statistical analyzes on the selection result of the operation allowance value. Then, the power system monitoring device 10D has the effects of the first embodiment and can output each calculation result on the screen (not shown) of the display unit 11, so that when the user sets the operation allowable value. Can reduce the labor.

Note that the results of statistical analysis of the operation allowable value are, for example, frequency distribution, histogram, scatter plot matrix, decision tree, etc. By displaying the results of these statistical analyzes on the screen, the user can statistically confirm information such as which time zone, which season, what kind of axis is harsh, or which is easier. It is possible to improve the usability of the user.

Although the present invention has been described with respect to the past power flow state (denoted as M minutes ago in the figure) to the current power flow state (denoted as an operating point in the figure), various examples of power systems have been described. The present invention is applied by predicting a future power flow state from a predicted value or a planned value (for example, a planned supply and demand value (planned value or predicted value of power generation and load) and a planned value of the interconnection power flow (P0)). It is also possible to do so. In this case, the prediction calculation of the future power flow state may be performed by the device or system to which the present invention is applied, or may be received by another device or system. By applying the present invention to future power flow conditions, it is possible to know in advance what axis will become the bottleneck in the future, and the operator will be able to consider measures in advance. It is possible to realize at least one or both of system stability and economical operation even in a situation where the power flow state or operation form of the power system changes in a complicated and frequent manner. ‥

The present invention is not limited to the above embodiment. Those skilled in the art can make various additions and changes within the scope of the present invention. The above embodiment is not limited to the configuration example illustrated in the accompanying drawings. The configuration and the processing method of the embodiment can be appropriately changed within the scope of achieving the object of the present invention.

Further, each constituent element of the present invention can be arbitrarily selected, and an invention having a selected configuration is also included in the present invention. Furthermore, the configurations described in the claims can be combined in addition to the combinations specified in the claims.

10, 10A, 10B, 10C, 10D: Power system monitoring device, 31: Operation allowable value calculation unit, 32: Difference calculation unit, 33, 33A: Operation allowable value selection unit, 34: Improvement measure calculation unit, 35: Command unit , 36: operation allowable value evaluation unit, 40: data acquisition unit, 42: result storage unit, 43: output control unit

Claims (15)

1. In the power system monitoring device in the power system,
   An operation allowance value calculation unit that calculates at least one operation allowance value from one or more of measured values and set values,
   A difference calculation unit that calculates a difference from one or more of the operation allowable value, the measured value, and the setting value calculated by the operation allowable value calculation unit,
   Operation for selecting an operation allowance value to be output according to a predetermined condition from one or more of the operation allowance value calculated by the operation allowance value calculation unit, the difference calculated by the difference calculation unit, and the set value Allowable value selection section,
   An output unit that outputs one or more of the measured value, the set value, the operation allowable value, and the difference for the selected operation target allowable value of the output,
   An electric power system monitoring device.
2. The power system monitoring device according to claim 1,
   The predetermined condition is to extract an operation allowance value satisfying a predetermined update frequency from operation allowance values included in one or more predetermined evaluation axes selected from a plurality of evaluation axes,
   Power system monitoring device.
3. In the power system monitoring device according to claim 1,
   The set values are operation target values, operation upper and lower limit values, constraint conditions, threshold values, margins, filter time constants, discretization conditions, operation allowable set times, allowable current calculation conditions, line configurations, line resistances, line types, and system configurations. , A system topology, a line constant, a generator constant, system data, supply and demand information, and a power system monitoring device.
4. In the power system monitoring device according to claim 1,
   The measured value, active power, reactive power, apparent power, voltage, frequency, power factor, weather conditions, temperature, wind speed, wind direction, solar radiation, load current value, wire temperature, ambient temperature, telemeter information, supervision information, One or more of the power system monitoring devices.
5. The power system monitoring device according to claim 1,
   The operation allowable value selecting unit selects the operation allowable value of the output target based on a priority set in advance for at least one operation allowable value calculated by the operation allowable value calculating unit, a power system monitoring device ..
6. In the power system monitoring device according to claim 1,
   The operation allowance value calculation unit selects operation allowance value candidates from current capacity calculation, dynamic rating calculation, heat capacity calculation, state estimation calculation, power flow calculation, optimum power flow calculation, transient stability calculation, steady state stability calculation, voltage stability. An electric power system monitoring device characterized by being obtained from one or more of calculation, frequency stability calculation, cascading calculation, islanding calculation, transmission rule between electric power companies.
7. In the power system monitoring device according to claim 6,
   The difference calculation unit calculates a difference from the operation allowable value candidate and the setting value, and determines an operation allowable value of the output target based on the calculation result of the difference and the setting value. apparatus.
8. In the power system monitoring device according to claim 6,
   The operation allowance value selection unit uses the set value to pass the operation allowance value candidate through one or more of a low pass filter, a moving average filter, a high pass filter, a moving difference filter, a band pass filter, or a discretization. By doing so, a power system monitoring device that determines the operation allowable value of the output target.
9. In the power system monitoring device according to claim 1,
   The operation allowable value selecting unit selects the operation allowable value to be output from the difference between the operation allowable value calculated by the operation allowable value calculating unit and the measured value.
10. In the power system monitoring device according to claim 1,
    The output unit, one or more operation allowable value of the output target, one-dimensional numerical value, two-dimensional numerical table, two-dimensional plan view, two-dimensional nomogram diagram, three-dimensional nomogram diagram, multidimensional diagram , A multidimensional nomogram diagram, which outputs as at least one of them.
11. In the power system monitoring device according to claim 10,
    The output unit further includes a notification unit for notifying a time transition of the operation allowable value of the output target,
    The notification means is
    One-dimensional numerical value, one or more blinking colons or times,
    Two-dimensional time-series waveform, operating point trajectory in two-dimensional plan or nomogram,
    Trajectory of driving point in 3D nomogram or trajectory of driving point in multidimensional nomogram,
    An electric power system monitoring device that outputs a time transition of the operation allowable value by outputting at least one or more of the above.
12. The power system monitoring device according to claim 11,
    The output unit outputs at least one or more of reproduction, rewinding, fast-forwarding, pausing, skipping for a certain period of time, and repeat for the time transition of the operation allowable value of the output target based on the input instruction. , Power system monitoring equipment.
13. In the power system monitoring device according to claim 5,
    The power system monitoring device, wherein the priority is a weighting coefficient set based on at least one of system information, operation information, weather information, and operation constraints.
14. In the power system monitoring device according to claim 13,
    The operation allowable value selecting unit calculates a difference between the operation allowable value calculated by the operation allowable value calculating unit and the measured value, and selects the operation allowable value of the output target based on the difference. And, based on the difference weighted by the priority, executing at least one or both of the case of selecting the operation allowable value of the output target,
    Power system monitoring device.
15. In the power system monitoring method of monitoring the power system with a computer,
    The calculator is
    An operation allowance calculation step of calculating at least one operation allowance from one or more of the measured value and the set value,
    A difference calculation step of calculating a difference from one or more of the operation allowable value, the measured value, and the setting value calculated by the operation allowable value calculating step,
    An operation allowable value to be output is selected according to a predetermined condition from one or more of the operation allowable value calculated in the operation allowable value calculating step, the difference calculated in the difference calculating step, and the set value. Operation allowable value selection step,
    An output step of outputting one or more of the measured value, the set value, the operation allowable value, and the difference for the selected operation allowable value of the output target;
    The power system monitoring method for executing.

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