JP4406346B2 - Server and system, method, and program for providing wide area measurement service for electric power system - Google Patents

Description

  The present invention estimates or predicts the state of the power system or the equipment connected to the power system from the amount of electricity of the power system including the transmission line and the distribution line, and sends the estimation / prediction result via the communication network. The present invention relates to a technique for providing to a display operation device of a user.

  The measurement and estimation of the state of the conventional power system are performed locally with respect to the focused part, and the amount of electricity such as current and voltage of the focused part is measured by installing a dedicated measuring instrument. Moreover, the analysis of the measurement result was performed by an expert each time or a dedicated analysis device was individually installed. In addition, the installation location of measuring instruments was often limited only to those owned by electric power companies, such as ultra-high voltage, high-voltage substations, and power plants, which have a large impact on the entire power system.

  As a measurement system for a conventional power system, for example, in the power system measurement system of Patent Document 1, the current and voltage of a bus, a transmission line are obtained by a measurement unit installed at a substation in order to measure the power system of interest. The amount of electricity is captured and sent to the system recorder and oscilloscope device in the substation main building.

In addition, in the power system stabilization device and the monitoring device of Patent Document 2, in order to determine the stability of the system fluctuation from the observation data in real time, the active power and voltage observed at the substation in the power system. Such time series data is taken into the system stabilization device via the communication means.
JP-A-9-135543 JP 2001-352679 A “Protective Relay System Engineering”, The Institute of Electrical Engineers of Japan, pages 108-110

  By the way, when measuring, estimating, and analyzing a power system using the above-described conventional technique, a measuring instrument is often installed only when a user recognizes that there is a problem or problem in the power system. In many cases, a measuring instrument is locally installed only in a focused area, for example, a specific system of a specific power company.

  However, the power system is configured by connecting a large number of devices, power transmission lines, and distribution lines in a complicated manner. For example, since the power transmission networks of a plurality of power companies are configured in a complex manner, In order to solve the problem by estimation and analysis, it is often necessary to measure for a long time, and in many cases, a wide range of measurement is required instead of local.

  Therefore, conventional local and short-term measurement methods are insufficient in measurement accuracy and analysis accuracy. Further, in the prior art, a dedicated measuring device or an analysis specialist is required, which requires a great deal of time and money. And since it was expensive in this way, there existed a problem that measurement of a wide area was impossible. Furthermore, in the prior art, because measuring instruments were installed only at power substations owned by electric power companies, the state of the electric power system using the amount of electricity acquired by the measuring instruments by users other than electric power companies It was difficult to estimate. In addition, there is a problem that the time from measurement to estimation / analysis becomes long, which is inconvenient for the user.

  The present invention has been proposed to solve the above-described problems of the prior art, and its purpose is to reduce the time and cost for measurement, and to a power system regardless of location and time. It is to provide a wide-area measurement service providing server and system, method, and program for an electric power system that can provide a user with the above state.

  In order to achieve the above object, the present invention estimates the state of a power system using target information transmitted from a display-side operation device on the user side and electricity quantity information obtained from an information terminal connected to the power system.・ Predict and send the result to the display operation device on the user side via the communication network, simplifying the measurement equipment, and from measuring the amount of electricity in the power system to estimating / predicting its state It is designed to reduce time and the time required to provide information to users.

  The wide-area measurement service providing server for a power system of the present invention estimates or predicts the state of the power system or the equipment connected to the power system from the amount of electricity of the power system including the power transmission line and the distribution line. In the wide-area measurement service providing server for the power system that provides the estimation / prediction result to the display operation device of the user via the communication network, the target information receiving unit, the electrical quantity information receiving unit, the estimation / prediction executing unit, the execution result transmitting unit It is characterized by having.

Here, the target information receiving means is means for receiving the target information indicating the target range of state estimation / prediction transmitted from the display operation device on the user side via the communication network, and the electric quantity information receiving means It is means for receiving electricity quantity information from at least one information terminal connected to the system and obtaining the electricity quantity of the power system via a communication network. The electric quantity information received by the electric quantity information receiving means is a voltage value and a phase obtained as a phasor value from an instantaneous value of the voltage of the power system acquired at a predetermined electric quantity acquisition time by an information terminal. The estimation / prediction execution means is means for estimating or predicting the state of the power system or the equipment connected to the power system using the received target information and electricity quantity information, and the execution result transmission means is It is a means for transmitting the estimation / prediction result by the estimation / prediction execution means to the display / operation device on the user side via the communication network. In the estimation / prediction in the estimation / prediction execution means, in the estimation using a plurality of the electric quantity information received from the plurality of information terminals, a plurality of measurements of the power system received from the plurality of information terminals are performed. A determination rule based on a voltage phase difference that determines whether or not a voltage phase difference that is a phase difference between voltages at a location exceeds a voltage phase difference predetermined value that is a predetermined value of the voltage phase difference; and the plurality of information terminals In the power system based on a determination rule based on a voltage value that determines whether or not the voltage value of the voltage at the plurality of measurement points of the power system received from the voltage value exceeds a predetermined voltage value that is a predetermined voltage value The occurrence of an accident in a power transmission network or a distribution network or the occurrence of an abnormality in a device connected to the power system is estimated, and only the electric quantity information received from one information terminal is used. In the estimation, the absolute value of the by differentiating the phase of one of the voltage of the information the power system, which is received from the terminal at the time to calculate the frequency of the voltage, minus the commercial frequency from the frequency of the calculated voltage value abnormal power grid or accident power distribution network or connected to said power system apparatus of the power system based on a determination rule by determining the frequency whether exceeds a frequency predetermined value is a predetermined value of frequency Is done by estimating the occurrence of.

  Further, the power system wide-area measurement service providing system, the power system wide-area measurement service providing method, and the power system wide-area measurement service providing program according to the present invention are characterized by the features of the power system wide-area measurement service providing server, the information terminal In terms of system, method, and program.

  According to the present invention as described above, the target information transmitted from the display operation device on the user side and the electrical quantity information from at least one information terminal connected to the power system are received via the communication network. Using these pieces of information, it is possible to quickly estimate or predict the state of the range targeted by the user in the power system or the equipment connected to the power system. And the estimation / prediction result of the state of the range which a user makes object can be promptly transmitted to the display operation apparatus of a user side via a communication network.

The definitions of important terms in the present invention are as follows.
“Equipment connected to a power system” is a broad concept including various types of equipment such as transmission and distribution lines, various devices, and various devices connected to the power system.

“User” is a broad concept that encompasses electric power companies, operators connected to the electric power system, consumers supplied with electric power from the electric power system, and operators that manufacture and supply devices in the electric power system. is there. Specifically, users are, for example, companies that supply or use electric power, such as specific-scale electric power companies, power generation companies, general industry companies that have factories, building management companies, public facilities, and local governments. It means a customer and a business operator who consigns power, a business operator who conducts consulting related to manufacturing and power quality of various devices related to a power system, and system analysis.

  According to the present invention, the state of the power system is estimated / predicted using the target information transmitted from the display operation device on the user side and the electric quantity information obtained by the information terminal connected to the power system, and the result Is transmitted to the display operation device on the user side via the communication network, thereby reducing the time and cost for measurement and providing the user with the status of the power system regardless of location or time Wide area measurement service providing server and system, method, and program can be provided.

  Hereinafter, an embodiment of a wide-area measurement service providing system for an electric power system to which the present invention is applied will be specifically described with reference to the drawings.

[Basic embodiment]
[Constitution]
FIG. 1 is a configuration diagram showing a wide-area measurement service providing system for a power system (hereinafter abbreviated as “system” as appropriate) according to a basic embodiment to which the present invention is applied.

  As shown in FIG. 1, the system of this embodiment includes a power system wide area measurement service providing server (hereinafter abbreviated as “server” as appropriate) 1, a communication network 2, and a display operation device for a plurality of users. 3 (31 to 3n) and a power system 4 are provided. Here, the power system 4 is configured to include a power transmission network 5 and a plurality of power distribution networks 6 (61 to 6n) which are subordinate systems thereof. The power system 4 is distributed and arranged over a wide area. A plurality of information terminals 7 (71 to 7n) are connected.

  The server 1, the plurality of user display operation devices 3 (31 to 3n), and the plurality of information terminals 7 (71 to 7n) are connected to the communication network 2, respectively. Via, it communicates with the display operation devices 3 (31 to 3n) and the plurality of information terminals 7 (71 to 7n) of a plurality of users.

  The server 1 also includes an electricity quantity information receiving unit 11, a target information receiving unit 12, an estimation / prediction execution unit 13, and an execution result transmission unit 14. Here, the electric quantity information receiving means 11 and the target information receiving means 12 are target information indicating the electric quantity information transmitted from the information terminal 7 and the target range of state estimation / prediction transmitted from the display operation device 3 of the user. Are respectively received via the communication network 2.

  Further, the estimation / prediction execution means 13 estimates or predicts the state of the power system 4 or the equipment (transmission / distribution line / device / device, etc.) connected to the power system 4 using the received target information and electric quantity information. The execution result transmission unit 14 is a unit that transmits the estimation / prediction result obtained by the estimation / prediction execution unit 13 to the display operation device 3 of the user via the communication network 2.

  Specifically, the server 1 is realized by a combination of a computer and a program specialized for providing a wide-area measurement service for a power system for controlling the computer. The user's display operation device 3 is also realized by a combination of a computer and a program, but can be easily realized by a general-purpose program. On the other hand, as the communication network 2, specifically, a wide-area communication infrastructure such as the Internet is assumed.

[Outline of operation]
FIG. 2 is a flowchart showing an outline of the operation of the power system wide-area measurement service providing system as described above.

  As shown in FIG. 2, the plurality of information terminals 7 (71 to 7n) installed in the power system 4 have a predetermined amount of electricity, for example, voltage and current, at the installation location in the power system 4. Is always acquired in the measurement cycle (YES in S101) (S102). The information terminal 7 (71 to 7n) also transmits the electric quantity information indicating the acquired electric quantity via the communication network 2 every predetermined transmission period set in advance or when the acquired electric quantity changes (YES in S103). Is transmitted to the server 1 (S104).

  In this case, when the server 1 receives the electrical quantity information from the information terminal 7 (71 to 7n) by the electrical quantity information receiving unit 11 (YES in S201), the electrical quantity information receiving unit 11 receives the received electrical quantity information. Is processed into a form that can be easily processed and passed to the estimation / prediction execution means 13 (S202).

  The server 1 also transmits an input screen for setting the target information by the target information receiving means 12 in response to the access from the display operation device 3 (31 to 3n) of the user (YES in S203). The target information setting support for the user is performed (S204). For this setting support, the user targets the target range (target range for state estimation / prediction of the server 1) to be measured and analyzed in the power system 4 on the display operation device 3 (31 to 3n). When set as information, an estimation / prediction request including the target information is transmitted from the display operation device 3 (31 to 3n) to the server 1 via the communication network 2.

  In this case (YES in S205), the server 1 receives the estimation / prediction request including the target information from the display operation device 3 (31-3n) by the target information receiving unit 12 (S206). The target information receiving unit 12 passes the received target information to the estimation / prediction execution unit 13.

  The estimation / prediction execution means 13 determines the required electrical quantity information based on the target range indicated by the target information, and based on the determined content, the required electrical quantity from the electrical quantity acquired from the electrical quantity information receiving means 11. Are used by narrowing down and performing estimation / prediction calculation (S207). The estimation / prediction result by the estimation / prediction execution unit 13 is transmitted by the execution result transmission unit 14 to the display operation device 3 (31-3n) of the requesting user via the communication network 2 (S208).

[Specific example of estimation / prediction calculation processing]
In the following, when a target range is set for a power system to which specific electrical facilities A to D as shown in FIG. 3 are connected, the amount of electricity from the information terminal 7 having the configuration as shown in FIG. An example of performing a specific estimation / prediction calculation process based on the information will be described.

  In the power system 4 shown in FIG. 3, from the viewpoint of simplifying the explanation, the power transmission network 5 and the two power distribution networks 61 and 62 which are lower systems connected thereto are connected to the two power distribution networks 61 and 62. Only four electrical installations A to D are described. Specifically, the electrical facilities A to D are, for example, a factory, a building, a general household, and the like. Information terminals 7A to 7D are installed in these electrical facilities A to D, respectively. These information terminals 7 </ b> A to 7 </ b> D are configured to perform time synchronization and position information acquisition using GPS radio waves from the GPS satellite 10.

  FIG. 4 is a configuration diagram illustrating a configuration example of the information terminal 7. As shown in FIG. 4, the information terminal 7 includes an electric quantity sensor 701, a sampling means 702, an electric quantity calculation means 703, a communication means 704, and a GPS antenna 705. With this configuration, the following operation is performed. Do.

  First, an electric quantity sensor 701 (PT for voltage, CT for electric current, etc.) always takes out the electric quantity from the power system 4, and the electric quantity taken out is sampled at a predetermined sampling period by the sampling means 702. Sampling and digitizing. In this sampling means 702, the sampling timing is matched with other information terminals using GPS radio waves from the GPS satellite 10 received by the GPS antenna 705.

Next, the electric quantity calculation means 703 converts the instantaneous value into a phasor value (amplitude and phase expression) using the sampled and digitized electric quantity. FIG. 5 shows, as examples of phasor values, sampling conditions of instantaneous values of voltages at electric facilities A and B at time t1, amplitudes V _A and V _{B of} voltages converted into phasor values, and phases θ _A and θ _B. ing. Thus, by using GPS in the information terminal 7, precise time synchronization can be established between the amounts of electricity acquired at remote points.

  In the example of the information terminal 7 shown in FIG. 4, GPS is used as a means for wide-area time synchronization, but other means capable of precise time synchronization (FM wave reception, use of absolute time distribution service by wire, etc.) However, the operation and effect are the same. When such other means are used, other time synchronization hardware is connected instead of the GPS antenna 705 in FIG.

  The electric quantity information by the amplitude and phase expression obtained by the electric quantity calculating means 703 as described above is transmitted to the server 1 via the communication network 2 by the communication means 704. In addition, since the position information of the information terminal 7 can be acquired at the same time as the time synchronization with other information terminals 7 by GPS, the position information is sent from the communication unit 704 of the information terminal 7 to the server 1 together with the electric quantity information. Sent.

In the server 1, when the electricity quantity information from the information terminal 7 is received by the electricity quantity information receiving means 11, the electricity quantity information receiving means 11, as shown in FIG. _A data file in which V _{A to} V _D and phases θ _{A to} θ _D ) are aligned in accordance with the electric quantity acquisition time is created.

  As described above, the user can access the server 1 from the display operation device 3 and set a target range to be measured / analyzed as target information. Here, for example, it is assumed that the user selects the installation locations A, B, and C as measurement / analysis targets. In this case, from the user's display operation device 3, the target information including “user name”, “installation locations A, B, C”, and “measurement time” is received as an estimation / prediction request as described above. To the server 1 and received by the target information receiving means 12 of the server 1.

  Note that the location information of each information terminal may be provided to the user at the time of setting the target information as described above. In this case, the user can set the target information efficiently by using the position information of each information terminal. Alternatively, by making it possible to make an inquiry about the location information of the terminal information to the user at the same time as the estimation / prediction request, the location information of each information terminal is provided to the user at the same time when the estimation / prediction result is provided. It may be.

  FIG. 7 is a diagram illustrating an example of a screen displayed on the display operation device 3. FIG. 7A is an example of a target information setting support screen, and FIG. 7B is an example of an estimation / prediction result display screen. In the setting support screen example shown in FIG. 7A, “measurement analysis target” and “measurement time range” can be set as target information.

[Estimation / prediction calculation processing based on electricity information from multiple information terminals]
When the target information receiving unit 12 of the server 1 receives the target information set as shown in FIG. 7A, the target information receiving unit 12 passes this target information to the estimation / prediction execution unit 13. The estimation / prediction execution means 13 uses the target information and the data file of the electric quantity information as shown in FIG. 6 to use the electric quantity data of the installation points A to C of the information terminal 7 corresponding to the “measurement analysis target”. That is, the amount of electricity at points _{A to C} : voltage values V _{A to} V _C and phases θ _{A to} θ _C are extracted in the corresponding “measurement time range”. Next, the estimation / prediction execution means 13 calculates the extracted information according to the following equations (1) and (2) for each time.

Δθ _AB = | θ _A −θ _B | (1)
Δθ _CB = | θ _C −θ _B | (2)

  Here, the estimation / prediction execution means 13 uses the fact that the voltage phase difference at both ends of the fault line exceeds a predetermined value when there is an accident in the power system 4, and the following voltage phase difference Judge by.

[Judgment Rule R1 Based on Voltage Phase Difference]
If Δθ _AB > θ _K and Δθ _CB > θ _K ,
Accident / device abnormality occurred in the power grid 5.
If Δθ _AB > θ _K and Δθ _CB <θ _K ,
Accidents and equipment abnormalities occurred on the distribution line connected to facility A in the distribution network 61.

  In addition, taking into account the case where the phase difference is not sufficiently large depending on the aspect of the accident, the estimation / prediction execution means 13 utilizes the fact that the voltage of the transmission / distribution line connected to the accident point drops at the time of the accident. The determination is also made based on the voltage value as follows.

[Judgment Rule R2 Based on Voltage Value]
If V _A <V _K , V _B <V _K , and V _C <V _K ,
Accident / device abnormality occurred in the power grid 5.
If V _A <V _K , V _C <V _K and V _B > V _K ,
Accidents and equipment abnormalities occurred on the distribution line connected to facility A in the distribution network 61.

  The determination rules R1 and R2 described above are based on the correlation between the quantities of electricity observed by the estimation / prediction execution means 13 in a plurality of subordinate distribution networks connected to the superordinate power transmission network, and a correlated event is obtained. It shows that it can be handled as a higher-order event.

  8 (a) and 8 (b) show the voltage phase difference and the change in voltage value and the abnormality detection / resolution points, respectively, in order to explain the determination processing method expressed by the determination rules R1 and R2. It is a graph to show.

The execution result transmitting unit 14 obtains the estimation / prediction result obtained by the estimation / prediction execution unit 13, that is, the measurement values V _{A to} V _C , θ _{A to} θ _C, and the determination result described above. Then, the information is transmitted to the display / operation device 3 of the user of the estimation / prediction request source.

  As a result, a display screen of the estimation / prediction result as shown in FIG. 7B is displayed on the display / operation device 3 of the user of the estimation / prediction request source. Information on whether the voltage or time-synchronized absolute phase set as “A” and “C” was set, and whether an accident or device abnormality occurred in each of the transmission network and the distribution network at each point in the “measurement time range” Can be easily confirmed visually.

[Estimation / prediction calculation processing based on electricity information from one information terminal]
The different algorithms for estimation / prediction calculation processing are shown below. In this process, as shown in the following equation (3), the above-mentioned θ _A is differentiated with respect to time to obtain a frequency, and a determination is made based on the value of this frequency.

d (θ _A ) / dt = f _A (3)

[Judgment rule R3 by frequency]
| F _A −commercial frequency |> f _K
Accidents or equipment abnormalities occur in the power system.

FIG. 9 is a graph showing a change in frequency and an abnormality detection / resolution point in order to explain the determination processing method expressed by the above-described determination rule R3. As shown in FIG. 9, the frequency f _A approaches the commercial frequency as the accident or device abnormality is recovered.

  In this way, it is also possible to estimate the state of the power system using only the electric quantity information from one information terminal.

[effect]
As described above, according to the present embodiment, the measurement of the power system is performed using a plurality of information terminals dispersedly installed in a wide area, and the obtained electricity information in a wide area and target information from a user are used. The state of the range targeted by the user in the power system can be quickly and accurately estimated and predicted, and the result can be quickly provided to the user via the communication network. Below, the effect of this embodiment is demonstrated in detail.

  First, when identifying abnormal phenomena in the power system, such as the occurrence of grid faults and control device abnormalities, it is possible to measure the amount of time synchronized electricity from multiple information terminals. The state can be estimated with accuracy.

  Moreover, in the prior art, only the current and voltage within a limited range such as a bus in a substation owned by an electric power company and a transmission line were measured, and an abnormal phenomenon of the transmission network was captured. It is only necessary to acquire the amount of electricity from the electrical equipment connected to the distribution network, and it is possible to detect abnormalities in the power transmission network even if it is not necessarily the amount of electricity from the power company equipment. From the point of view, it is superior to the prior art.

  In addition, it is possible to accurately estimate the state of the higher-level system only by installing the information terminal in the power distribution network that is the lower-level system and without installing the information terminal in the transmission network that is the higher-level system. In general, since the installation of information terminals in the host system is expensive, the effect of reducing measurement costs is great.

  Moreover, the same user can grasp | ascertain easily comprehensively the aspect of the some power transmission network which several electric power companies operate individually as one aspect of an electric power system. Therefore, it becomes possible to implement | achieve appropriate system operation according to the state of the whole wide power system over a some power transmission network.

  Furthermore, as shown in the above formulas (1) to (3), the amplitude and phase are extracted using a voltage that is easy to acquire, and the occurrence range of the accident / device abnormality is specified based on these values. Therefore, there is an advantage that it is possible to easily measure the amount of electricity without necessarily requiring current measurement as in the prior art.

  In addition, since the information terminal, server, and user's display / operation device are connected via a communication network, the user can quickly obtain the necessary amount of electricity to be measured simply by accessing the server via the communication network. It is possible to easily grasp the state of the power system regardless of the place and time.

  Furthermore, by collecting the location information of the information terminals by the server, the user and the service provider (information terminal installer) can easily confirm the location of each information terminal, thereby There is an advantage that the maintenance operation becomes easy.

[Application example]
The system of the above embodiment can be applied in various ways. Hereinafter, a plurality of such application examples will be sequentially described.

[Example of using the customer's power line voltage as the amount of electricity]
As an application example of the above-described embodiment, as shown in FIG. 10, a configuration in which a power line voltage of a consumer is measured and used as an electric quantity is conceivable. As described above, in the prior art, in order to estimate and predict the state of the power system, a measuring device is generally installed in the substation of the electric power company to measure the bus voltage. In the invention, the state of the power system can be estimated and predicted by measuring the power line voltage of a consumer such as a factory or a general household.

  FIG. 10 shows a case where the information terminal 7 is installed in a general household, and the voltage of the power line that enters the home from the distribution line is taken into the information terminal 7 from the outlet 701a. The information terminal 7 is connected to the Internet 2a through a modem 704a. Here, the outlet 701a and the model 704a correspond to the electric quantity sensor 701 and the communication unit 704 shown in FIG. 4, respectively.

  In this case, the information terminal 7 measures the voltage of the distribution line drawn into the home, calculates the phasor value as described above, and synchronizes the time with the GPS antenna 705 at this time. The calculated phasor value is sent to the server 1 at regular intervals through the Internet 2a connected to a home personal computer. The operation on the server 1 side is as described above.

  According to this example, since the voltage from the power line of a consumer such as a home or factory can be used as the amount of electricity input to the information terminal, the installation cost is reduced, and the power company's property is not used. There are advantages in that operators and customers other than the company can be installed, the selection range of measurement points is widened, and high-precision measurement can be performed.

[Example of providing filters for information terminals and servers]
As an application example of the above embodiment, as shown in FIG. 11, in order to remove signal components other than the electrical quantity component necessary for estimating the state of the power system with respect to the electrical quantity acquired by the information terminal 7, A configuration in which a filter F is provided in at least one of the electricity amount calculation means 703 in each information terminal 7 and the estimated prediction means 13 in the server 1 can be considered.

  In this case, the characteristics of the filter F are changed according to the analysis method set by the user. When changing the characteristics of the filter F in the information terminal 7, as shown in FIG. 11, the user directly accesses the information terminal “route P 1”, “route P 2” via the communication network 2, and server 1 The setting can be changed on any of the “route P3”. Further, when changing the characteristics of the filter F in the server 1, the user can change the setting by “route P 4” via the target information receiving means 12.

  Thus, when the filter F is provided in at least one of the information terminal 7 and the server 1, the following operation is obtained.

  First, the operation when the filter F is provided in the information terminal 7 will be described. In addition to the commercial frequency (50 Hz or 60 Hz), various frequencies are superimposed on the instantaneous amount of electricity acquired from the power system targeted by the present invention. Therefore, for example, if attention is paid to an accident phenomenon in the electric power system, filtering that mainly extracts only the vicinity of the commercial frequency is performed by the filter F in the electric quantity calculation means 703 of the information terminal 7.

  Specifically, it can be realized by a digital filter as shown in Non-Patent Document 1. The electric quantity calculation means 703 calculates the phasor value as described above after filtering. Information indicating the amount of electricity from which disturbances other than the frequency band of interest have been removed is sent from the communication means 704 to the server 1. In addition, when observing a specific order, for example, third, fifth, and seventh harmonics, the user can calculate the quantity of electricity by changing the filter characteristic to a value corresponding thereto. .

  Next, an operation when the filter F is provided in the server 1 will be described. When the server 1 receives the phasor value from each information terminal 7 by the electricity quantity information receiving unit 11, the effective value of the received phasor value is filtered by the filter F in the estimation prediction unit 13. For example, in the case of a flicker phenomenon or system fluctuation phenomenon occurring in an electric power system, there is a fluctuation in the effective value of a long period of several hundred milliseconds to a few seconds. If so, the accuracy of the subsequent estimation / prediction calculation can be improved. The filter characteristic is changed by the user via the target information receiving means 12 of the server 1.

  Note that, as the filter F in a broad sense, a transformation process that focuses on the frequency domain such as Fourier transform and wavelet transform can be selected and set according to the target.

  Thus, by providing the filter F in at least one of the information terminal 7 and the server 1, it is possible to accurately estimate and predict the state of the power system of interest.

[Example of correcting phase shift]
As one application example of the above-described embodiment, a configuration in which the phase shift is corrected in the estimation / prediction execution unit 13 of the server 1 with respect to the phase shift of the electrical quantity generated by the equipment installed in the power system can be considered. . The estimation / prediction execution means 13 corrects that the phase is rotated by equipment existing in the power system, for example, a transformer. A method for correcting such a phase shift will be described below.

As shown in the above formulas (1) and (2), the estimation / prediction execution means 13 measures the phases at points A and B to estimate whether or not there is an accident in the transmission line network. In this case, when both the A and B points are installed in a customer connected to the distribution network, the phase is rotated by the transformer existing between the transmission line network and the installation point. In Expressions (1) and (2), the determination threshold value θ _K cannot be set. In order to avoid such inconvenience, the following formula (1a) is used as a judgment formula, which is obtained by adding values θ _α and θ _β for correcting the phase rotation from the power grid to the measurement point to the formula (1). To do.

Δθ _AB = | (θ _A + θ _α ) − (θ _B + θ _β ) | (1a)

  As for the formula (2), a formula with the same correction is used as the judgment formula. The estimation / prediction execution means 13 performs an estimation / prediction calculation from the phase angle obtained by the determination formula with these corrections added.

  As described above, by correcting the phase shift of the amount of electricity generated by the equipment installed in the power system, it is possible to accurately estimate and predict the state of the power system of interest.

[Example of generating power state quality map]
As an application example of the above embodiment, the electric quantity calculation means 703 of the information terminal 7 performs the power quality calculation calculation, and as shown in FIG. A configuration is possible in which an electricity quantity collecting means 15 for collecting electricity quantity information is provided, and a power quality state map is generated by the estimation / prediction execution means 13 using the collected electricity quantity information.

  In FIG. 12, the electricity quantity calculation means 703 (FIG. 4) of the plurality of information terminals 7 (71 to 7 n) performs at least one of the following calculations and detections as “power quality calculation calculation”.

"Instantaneous voltage drop detection calculation":
When the voltage V detected at the information terminal is equal to or lower than the predetermined value V _K , an instantaneous voltage drop (instantaneous drop) is detected.

"Voltage imbalance detection calculation":
When the two-phase or three-phase voltage detected by the information terminal is not within the predetermined value range, the occurrence of voltage imbalance is detected.

"Harmonic detection calculation":
Calculates the magnitude of harmonics relative to the commercial frequency, and detects and detects harmonics when a certain level of harmonics is generated above a certain level.

"Flicker detection":
The voltage flicker phenomenon is detected at the information terminal.
“Frequency fluctuation detection”:
An information terminal detects that it has deviated from the commercial frequency to a predetermined range or more.

  Hereinafter, a case where one information terminal 71 detects “instantaneous drop” will be described. When the voltage drop is detected by the above “voltage drop detection calculation”, the information terminal 71 transmits the voltage drop detection information indicating the voltage drop detection to the server 1 via the communication network 2 together with the detection time and the detection voltage. To do. This instantaneous drop detection information is passed from the electricity quantity information receiving means 11 in the server 1 to the estimation / prediction executing means 13.

  In this case, the estimation / prediction execution unit 13 determines information terminals in a range related to the information terminal 71. Specifically, as shown in FIG. 12, the distribution network to which the information terminal 71 is connected, the transmission network connected to the distribution network, and other distribution networks connected to the transmission network are included in this range. The existing information terminals 72 to 7n are determined as target terminals.

  Next, the estimation / prediction execution means 13 transmits the electrical quantity transmission command for the information terminals 72 to 7n determined in this way via the electrical quantity collection means 15. When the information terminals 72 to 7n receive the electrical quantity transmission command via the communication network 2, in response to the command, the information terminals 72-7n determine the electrical quantity information at the time when the information terminal 71 detects the instantaneous voltage drop and whether or not the instantaneous voltage drop is detected. The instantaneous drop detection information shown is transmitted to the server 1. The server 1 collects the instantaneous voltage drop detection information and the electricity quantity information of the information terminals 72 to 7n sent thereto by the electricity quantity collecting means 15.

  The estimation / prediction execution means 13 uses the collected information to generate a voltage sag occurrence map M indicating the situation and range of the instantaneous voltage drop as shown in FIG. In FIG. 12, as an example of the instantaneous drop occurrence map M, a map connecting equal voltages of 100%, 70%, and 50% voltage drop is shown.

  The information terminal 7 performs other power quality detections such as “voltage imbalance detection calculation” and “harmonic detection calculation” in the same manner, and when detecting a power quality decrease, the information terminal 7 indicates the power quality indicating the power quality decrease. The degradation information is transmitted to the server 1. And in the server 1, when such power quality degradation information is received, the information terminal of the range relevant to the said information terminal is similarly determined, necessary information is collected, and the same power quality state map Is generated.

  In this way, when power quality degradation such as instantaneous voltage drop, voltage imbalance, and harmonic generation occurs, by generating a power quality state map showing the situation and range, the user can From the quality state map, it is possible to easily grasp the status and range of power quality degradation visually. Therefore, the user can more appropriately carry out the maintenance operation of various facilities connected to the power system based on the information grasped from the power quality state map.

[Example using GPS receiver station]
As an application example of the above embodiment, as shown in FIG. 13, a configuration in which each information terminal 7 is provided with wireless reception means 706 that receives time information and position information from the GPS reception station 8 is conceivable.

  In this configuration, for example, the GPS receiving station 8 that acquired time information and position information from the GPS satellite 10 transmits the time information and position information to the information terminals 71 to 73 installed in the vicinity. In this case, the wireless receiving means 706 in the information terminals 71 to 73 communicates with the GPS receiving station 8 to calculate the distance to the GPS receiving station 8, and from the calculated distance, the received time information and The position information is corrected to obtain accurate time information and position information at the information terminal installation point.

  Then, as described above, the time information is added to the electrical quantity information as an absolute time and sent to the server 1 for processing. Similarly, the position information is sent to the server 1 for processing. The server 1 can automatically acquire the position of each information terminal based on the sent position information.

  In this way, even if each information terminal does not directly acquire time information from a GPS satellite, it is received by a nearby GPS receiving station 8, and time information from this GPS receiving station 8 is received by each information terminal. There is an advantage that it is not necessary to provide a GPS antenna in each information terminal, and the information terminal can be configured at a lower cost.

  Further, since the position information is received simultaneously with the time information, and the server 1 can automatically know the position of each information terminal, an instantaneous drop occurrence map, a power quality state map, etc. as shown in FIG. It is easy to generate.

  Furthermore, it is possible for the user to easily confirm whether the information terminal is installed at an appropriate position via the communication network, and there is an advantage that convenience is increased.

[Example of charging / billing]
As an application example of the above-described embodiment, as shown in FIG. 14, a configuration in which charging / billing means 16 is provided in the server 1 can be considered.

  In this configuration, when the user accesses the server 1 via the communication network 2 and refers to the estimation / prediction result obtained by the estimation / prediction execution unit 13, the charging / billing unit 16 of the server 1 Information to be referred to and the number of times are recorded as reference contents, billing is performed according to the recorded reference contents, and a bill from the service provider (installer or operator of the server 1 and the information terminal 7) to the user Create

In this case, specific information referred to by the user is, for example, information as shown below.
“Electricity information from information terminals (voltage, current phasor value, etc.)”,
"Detection results from information terminals (such as instantaneous drop detection, harmonic detection)",
"Accident range estimation results",
“Power quality status map (such as instantaneous drop occurrence map)”.

  The bill created by the billing / billing means 16 is sent to the display operation device 3 of each user via the communication network.

  The server 1 further predicts the future power quality near the facility to which the user pays attention by using the power quality state map and the instantaneous drop occurrence map as shown in FIG. If the prediction result matches the measurement content at the time of the prediction within a predetermined error range, the billing / billing means 16 creates a bill for remuneration for the predictive hit to the user. Send it. Here, the prediction of power quality refers to the probability that a power failure or instantaneous drop will occur after a predetermined time has elapsed and the probability that a harmonic will occur when the power system is operated in the equipment state at the time of prediction.

  In this way, by performing the billing / billing process in the server 1, it is possible to automatically and accurately calculate the cost according to the system usage status of the user, and the user can easily check the cost related to the system usage. Therefore, the system is highly convenient for the user. In addition, the service provider can easily charge for each user, which improves convenience. Furthermore, the power quality is predicted, and the service provider gains profits. This increases the number of information terminals installed, which can improve the prediction accuracy and increase the convenience for the user. .

[Example of sharing terminal costs]
As an application example of the above-described embodiment, as shown in FIG. 15, a configuration in which terminal cost sharing means 17 is provided in the server 1 in addition to the billing / billing means 16 is conceivable.

  In this configuration, the server 1 acquires in advance via the communication network user information indicating the amount of information obtained by the information terminal and the user's desire regarding information contents before the user receives the service of this system. Then, the user information is set by the terminal cost sharing means 17. In this case, the terminal cost sharing means 17 apportions the costs related to the manufacture, installation, and operation / maintenance of the information terminals among the users according to the user information of each user. In accordance with the apportioned result, billing / billing means 16 creates an invoice for expenses related to manufacture, installation, and operation / maintenance of the information terminal addressed to each user and sends it to each user.

  In this way, the costs associated with the manufacture, installation, and operation / maintenance of information terminals are shared among multiple users according to the amount of information obtained by the information terminals and the information content. It is possible to operate this system without spending time and improve convenience for both service providers and users.

[Other Embodiments]
The present invention is not limited to the above-described embodiments and modifications, and various other modifications can be implemented within the scope of the present invention. For example, the above-described modified examples can be appropriately combined.

  Furthermore, the configuration and processing contents of the power system wide-area measurement service providing system, the server constituting the power system, and the information terminal shown in the embodiment are merely examples, and target information transmitted from the display operation device on the user side. As long as the information on the amount of electricity obtained from the information terminal connected to the power system is used to estimate and predict the state of the power system and the result is transmitted to the display operation device on the user side via the communication network Various configurations and processing contents can be freely changed.

The block diagram which shows the wide-area measurement service provision system for electric power systems which concerns on basic embodiment to which this invention is applied. The flowchart which shows the outline of operation | movement of the wide area measurement service provision system for electric power systems shown in FIG. The block diagram which shows an example of the electric power system for demonstrating the specific estimation / prediction process by the wide-area measurement service provision system for electric power systems shown in FIG. The block diagram which shows the structural example of the information terminal shown in FIG. The figure explaining the electric quantity calculation process by the information terminal shown in FIG. The figure which shows an example of the data file produced in order to perform estimation / prediction calculation processing by the server shown in FIG. It is a figure which shows the example of a screen displayed on the display operation apparatus of a user shown in FIG. 1, (a) is an example of a setting assistance screen of object information, (b) is an example of a display screen of an estimation / prediction result. The graph explaining the determination process example (a) by a phase difference, and the determination process example (b) by a voltage value as an example of the estimation / prediction calculation process by the server shown in FIG. The graph explaining the determination processing example by a frequency as another example of the estimation / prediction calculation processing by the server shown in FIG. The figure which shows the example which used the electric lamp line voltage of a consumer as an electric quantity as an application example of the wide-area measurement service provision system for electric power systems shown in FIG. The figure which shows the example which provided the filter in the information terminal and the server as an application example of the wide-area measurement service provision system for electric power systems shown in FIG. The figure which shows the example which produces | generates a power state quality map as an application example of the wide-area measurement service provision system for electric power systems shown in FIG. The figure which shows the example using a GPS receiving station as an application example of the wide-area measurement service provision system for electric power systems shown in FIG. The figure which shows the example which charges and charges as an application example of the wide-area measurement service provision system for electric power systems shown in FIG. The figure which shows the example which shares a terminal expense as an application example of the wide-area measurement service provision system for electric power systems shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Electric power system wide area measurement service providing server 11 ... Electric quantity information receiving means 12 ... Target information receiving means 13 ... Estimation / prediction executing means 14 ... Execution result transmitting means 15 ... Electric quantity collecting means 16 ... Billing / billing means 17 ... Terminal cost sharing means 2 ... communication networks 3, 31 to 3N ... (user's) display operation device 4 ... power system 5 ... power transmission network 6, 61-6N, 6A-6D ... distribution network 7, 71-7N ... information terminal 701 ... Electric quantity sensor 702 ... Sampling means 703 ... Electric quantity calculation means 704 ... Communication means 705 ... GPS antenna 706 ... Radio reception means 8 ... GPS reception station 10 ... GPS satellite

Claims (12)

Estimate or predict the state of the power system or the equipment connected to the power system from the amount of electricity in the power system including the power transmission line and distribution line, and send the estimated / predicted result to the user via the communication network. In the power system wide area measurement service providing server to be provided to the display operation device,
Target information receiving means for receiving target information indicating a target range of state estimation / prediction transmitted from the user side display operation device via the communication network;
Electricity quantity information receiving means for receiving electricity quantity information from at least one information terminal connected to the power system and obtaining the electricity quantity of the power system via the communication network;
An estimation / prediction execution means for estimating or predicting the state of the power system or the equipment connected to the power system, using the received target information and the electric quantity information;
Execution result transmission means for transmitting the estimation / prediction result by the estimation / prediction execution means to the display operation device on the user side via the communication network, and
The electrical quantity information received by the electrical quantity information receiving means is a voltage value and a phase obtained as a phasor value from an instantaneous value of the voltage of the power system acquired at a predetermined electrical quantity acquisition time by the information terminal. ,
The estimation / prediction execution means includes:
In the estimation using a plurality of the electrical quantity information received from a plurality of the information terminals, a voltage level that is a phase difference between voltages at a plurality of measurement points of the power system received from the plurality of information terminals. A determination rule based on a voltage phase difference for determining whether or not the phase difference exceeds a voltage phase difference predetermined value, which is a predetermined value of the voltage phase difference, and a plurality of measurement locations of the power system received from the information terminals Occurrence of an accident in a power transmission network or distribution network in the power system based on a determination rule based on a voltage value for determining whether or not the voltage value of the voltage exceeds a predetermined voltage value that is a predetermined voltage value or Estimate the occurrence of abnormalities in equipment connected to the power system,
In the estimation using only the electrical quantity information received from one information terminal, the voltage phase of the power system received from one information terminal is differentiated with respect to time, and the voltage frequency is calculated. power grid or in the power system based on whether the absolute value of the value obtained by subtracting the commercial frequency from the frequency of the calculated voltage exceeds a frequency predetermined value is a predetermined value of the frequency determination rule by determining the frequency A wide-area measurement service providing server for a power system, characterized by estimating occurrence of an accident in a distribution network or occurrence of an abnormality in a device connected to the power system.   The server for providing a wide-area measurement service for an electric power system according to claim 1, wherein the amount of electricity includes a power line voltage of a consumer.   The said electric quantity contains the some electric quantity acquired by the time synchronization of the said some information terminal, The wide area measurement service provision server for electric power systems of Claim 1 or Claim 2 characterized by the above-mentioned.   The power system according to any one of claims 1 to 3, wherein at least one of the information terminal and the estimation / prediction execution unit includes a filter unit that removes a disturbance signal from the electric quantity. Wide area measurement service providing server.   5. The estimation / prediction execution unit is configured to correct a phase shift of an electric quantity generated by a device installed in the electric power system. A server for providing wide-area measurement services for power systems as described in 1. When the information terminal detects a decrease in power quality, the information terminal comprises an electricity amount collecting means for collecting electricity amount information from the information terminals in a related range,
The said estimation / prediction execution means is comprised so that an electric power quality state map may be produced | generated using the collected said electric quantity information, The any one of Claim 1 thru | or 5 characterized by the above-mentioned. Server for providing wide-area measurement services for power systems. The electricity amount collecting means is configured to collect electricity amount information and sag detection information from information terminals in a related range when an instantaneous voltage drop is detected by the information terminal that acquires the electricity amount of a consumer. ,
7. The power system according to claim 6, wherein the estimation / prediction execution unit is configured to generate a voltage sag occurrence map using the collected electrical quantity information and the voltage sag detection information. Wide area measurement service providing server. Estimate or predict the state of the power system or the equipment connected to the power system from the amount of electricity in the power system including the power transmission line and distribution line, and send the estimated / predicted result to the user via the communication network. A server provided to the display operation device;
In the wide-area measurement service providing system for a power system including at least one information terminal that is connected to the power system and acquires the amount of electricity of the power system,
The said server is a wide area measurement service provision server for electric power systems of any one of Claim 1 thru | or 7, The wide area measurement service provision system for electric power systems characterized by the above-mentioned.   9. The system for providing a wide-area measurement service for a power system according to claim 8, wherein the information terminal includes GPS receiving means for performing time synchronization and position information acquisition using GPS radio waves.   9. The wide-area measurement service providing system for an electric power system according to claim 8, wherein the information terminal includes wireless receiving means for receiving time information and position information from a GPS receiving station and performing time synchronization and position information acquisition. . Estimate or predict the state of the power system or the equipment connected to the power system from the amount of electricity in the power system including the power transmission line and distribution line, and send the estimated / predicted result to the user via the communication network. In a method for providing a wide-area measurement service for a power system to be provided to a display operation device,
Using a server provided with target information receiving means, electricity quantity information receiving means, estimation / prediction execution means, and execution result transmission means,
A target information receiving step of receiving, via the communication network, target information indicating a target range of state estimation / prediction transmitted from the display operation device on the user side by the target information receiving unit;
An electric quantity information receiving step for receiving, via the communication network, electric quantity information from at least one information terminal connected to the electric power system and acquiring the electric quantity of the electric power system by the electric quantity information receiving means; ,
An estimation / prediction execution step for estimating or predicting a state of the power system or a facility connected to the power system using the target information and the electrical quantity information received by the estimation / prediction execution unit;
The execution result transmission means performs an execution result transmission step of transmitting the estimation / prediction result by the estimation / prediction execution means to the display operation device on the user side via the communication network,
The electrical quantity information received by the electrical quantity information receiving step is a voltage value and a phase obtained as a phasor value from an instantaneous value of the voltage of the power system acquired at a predetermined electrical quantity acquisition time by the information terminal. ,
The estimation / prediction execution step includes:
In the estimation using a plurality of the electrical quantity information received from a plurality of the information terminals, a voltage level that is a phase difference between voltages at a plurality of measurement points of the power system received from the plurality of information terminals. A determination rule based on a voltage phase difference for determining whether or not the phase difference exceeds a voltage phase difference predetermined value, which is a predetermined value of the voltage phase difference, and a plurality of measurement locations of the power system received from the information terminals Occurrence of an accident in a power transmission network or distribution network in the power system based on a determination rule based on a voltage value for determining whether or not the voltage value of the voltage exceeds a predetermined voltage value that is a predetermined voltage value or Estimate the occurrence of abnormalities in equipment connected to the power system,
In the estimation using only the electrical quantity information received from one information terminal, the voltage phase of the power system received from one information terminal is differentiated with respect to time, and the voltage frequency is calculated. A transmission network or distribution in the power system based on a determination rule based on a frequency for determining whether or not an absolute value of a value obtained by subtracting a commercial frequency from the frequency of the calculated voltage exceeds a predetermined frequency value which is a predetermined frequency value A method for providing a wide-area measurement service for a power system, characterized by estimating the occurrence of a network accident or the occurrence of an abnormality in a device connected to the power system. Using a computer, estimate or predict the state of the power system or the equipment connected to the power system from the amount of electricity in the power system that includes the transmission lines and distribution lines, and communicate the estimation and prediction results. In a wide-area measurement service providing program for a power system provided to a user's display operation device via a network,
A target information receiving function for receiving target information indicating a target range of state estimation / prediction transmitted from the display operation device on the user side via the communication network;
An electric quantity information receiving function for receiving electric quantity information from at least one information terminal connected to the electric power system and acquiring the electric quantity of the electric power system via the communication network;
An estimation / prediction execution function for estimating or predicting the state of the power system or the equipment connected to the power system, using the received target information and the electric quantity information;
Causing the computer to realize an execution result transmission function for transmitting the estimation / prediction result by the estimation / prediction execution function to the display operation device on the user side via the communication network;
The electric quantity information received by the electric quantity information receiving function is a voltage value and a phase obtained as a phasor value from an instantaneous value of the voltage of the power system acquired at a predetermined electric quantity acquisition time by the information terminal. ,
The estimation / prediction execution function is:
In the estimation using a plurality of the electrical quantity information received from a plurality of the information terminals, a voltage level that is a phase difference between voltages at a plurality of measurement points of the power system received from the plurality of information terminals. A determination rule based on a voltage phase difference for determining whether or not the phase difference exceeds a voltage phase difference predetermined value, which is a predetermined value of the voltage phase difference, and a plurality of measurement locations of the power system received from the information terminals Occurrence of an accident in a power transmission network or distribution network in the power system based on a determination rule based on a voltage value for determining whether or not the voltage value of the voltage exceeds a predetermined voltage value that is a predetermined voltage value or Estimate the occurrence of abnormalities in equipment connected to the power system,
In the estimation using only the electrical quantity information received from one information terminal, the voltage phase of the power system received from one information terminal is differentiated with respect to time, and the voltage frequency is calculated. power grid or in the power system based on whether the absolute value of the value obtained by subtracting the commercial frequency from the frequency of the calculated voltage exceeds a frequency predetermined value is a predetermined value of the frequency determination rule by determining the frequency A program for providing a wide-area measurement service for a power system, wherein the occurrence of an accident in a distribution network or the occurrence of an abnormality in a device connected to the power system is estimated.

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