JP2023088715A - Cubicle monitoring system - Google Patents

Abstract

To install a load-driving storage battery in a cubicle to make it possible to continue remote monitoring of the cubicle even during a prolonged power failure, and utilize the storage battery as a power source in an emergency.SOLUTION: A cubicle 1 has a cubicle interior monitoring device 10 that transmits status information to a management server 3, and a storage battery 71. The cubicle interior monitoring device 10 is provided with a monitoring control device 23 that controls charging/discharging of the storage battery 71, and communicates with the management server 3. The management server 3 obtains reception power information supplied from a system to the cubicle 1, and notifies the monitoring control device 23 of the same. The monitoring control device 23 receives the reception power information from the management server 3 to control the charging/discharging of the storage battery 71 so that the reception power does not exceed a predetermined upper limit value, and, if the system falls into a power failure, allows a power source of the cubicle interior monitoring device 10 to be supplied from the storage battery 71 to keep a function of the cubicle interior monitoring device 10.SELECTED DRAWING: Figure 2

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cubicle monitoring system for remotely monitoring cubicles that receive system high voltage power.

A configuration in which a storage battery is arranged in a power receiving facility has become widespread in order to reduce electricity charges. By charging the installed storage battery during times of low power consumption, such as nighttime power, and discharging it when the received power is about to exceed the contracted power, it is effectively used to suppress peak power (for example, See Patent Document 1).

On the other hand, there is a cubicle monitoring system that remotely monitors the state of cubicle-type high-voltage power receiving equipment (hereafter, cubicle). In this system, if the power supply to the monitoring device was lost during a power outage on the grid side, the monitoring system judged that a system abnormality had occurred, and remote monitoring became impossible. In such a case, it was necessary to rush to the site and deal with it.
In order to prevent this problem, a backup power supply for the monitoring system and an uninterruptible power supply (UPS) were sometimes used. became necessary.

Also, in the case of a storage battery intended to secure a power supply during a large-scale blackout such as a disaster, it is necessary to always secure a large amount of stored power. used for

Japanese Patent Application Laid-Open No. 2021-36768

As mentioned above, in the conventional cubicle monitoring system, if the power supply to the monitoring device is lost due to a power outage on the grid side, various preparations must be made to investigate the cause of the power outage and rush to the site. rice field.
In some cases, a backup power supply for the monitoring system was used, but when the power outage lasted for a long period of time, the power supply was also lost and the monitoring device stopped working.
In addition, the battery equipment, which is used to secure a power supply during emergencies such as disasters, must always have a certain amount of remaining power storage, so it is not possible to fully utilize the storage capacity during normal times. I didn't. Furthermore, since such storage battery equipment is installed separately from the cubicle, it is necessary to have a place to put each of them, and wiring work to connect them is also necessary. was there.

Therefore, in view of such problems, the present invention installs a storage battery in the cubicle as a power supply for driving the load during a power failure, so that remote monitoring of the cubicle can be continued even if the power failure is prolonged, and in addition, the remaining amount of storage power in normal times. To provide a cubicle monitoring system capable of utilizing a storage battery as an emergency power supply without setting a large value.

In order to solve the above problems, the invention of claim 1 includes a cubicle that accommodates high-voltage power receiving equipment that receives high-voltage power from a system and supplies the power converted to low voltage to a load, and a cubicle that is arranged on the cloud. and a management server for accumulating and managing the state information of the cubicle, wherein the cubicle manages the storage battery for supplying power to at least part of the load in the event of a power failure in the system, and the state information. a cubicle monitoring device for transmitting to the server, the cubicle monitoring device measuring and collecting physical data including voltage values and current values of predetermined portions of the cubicle, which are part of the state information; and a monitoring control device that controls charging and discharging of the storage battery and communicates with the management server, and the management server obtains measured value information from a watt-hour meter that measures the received power supplied from the grid to the cubicle. While having a power information acquisition unit, the monitoring control device includes a storage battery control unit that acquires received power information from the management server and controls charging and discharging of the storage battery so that the received power does not exceed a predetermined upper limit value, and a system power outage. and a power control unit for supplying power to the cubicle monitoring device from a storage battery to maintain the function of the cubicle monitoring device.
According to this configuration, when the system fails, the storage battery is used as the power source to operate the cubicle monitoring device, so even if the system fails, the cubicle information can be transmitted to the monitoring server. In addition, since the capacity of the storage battery is also an emergency power source for the load, the capacity is relatively large.
Therefore, remote monitoring of cubicles can be continuously performed, and situations in which a manager rushes to the site every time a power failure occurs can be reduced.
In addition, since the storage battery is controlled so that the received power does not exceed a predetermined upper limit value, it is possible to reduce power charges, and since the storage battery is placed inside the cubicle, the power distribution equipment inside the cubicle is connected to the storage battery. can be easily implemented, and the installation space can be minimized.

According to the second aspect of the invention, in the configuration of the first aspect, the cubicle converts the DC power generated by the photovoltaic power generation device and the DC power stored in the storage battery into AC power and supplies the power to the load. A power conditioner is installed to convert AC power into DC power and supply it to the storage battery. and a power generation prediction unit for predicting the power generated by the photovoltaic power generation device to be supplied. is characterized by setting the lower limit value of the remaining power storage amount.
According to this configuration, the lower limit value of the remaining amount of electricity stored in the storage battery is set according to the weather conditions. For example, if a sufficient amount of power generation cannot be expected for the time being due to continuous rain, the lower limit value is set large. can be implemented to prepare for emergencies, or if the weather continues to be sunny, the lower limit can be set low and the stored power can be controlled to make effective use of the storage battery.

According to the invention of claim 3, in the configuration of claim 1 or 2, the state information transmitted from the monitoring and control device to the management server includes power usage information supplied to the load, and the management server receives the received power usage information. A load power information storage unit for storing information, and a load power prediction unit for predicting the power consumption of the load for a predetermined time ahead based on the past power consumption information. The information is transmitted to the monitoring control device, and the monitoring control device sets the lower limit value of the remaining power amount of the storage battery based on the prediction information.
According to this configuration, since the power to be supplied to the load is predicted and the lower limit value of the remaining power amount is set, the storage battery can be effectively used.

According to the present invention, when the system fails, the storage battery is used as the power source to operate the cubicle monitoring device, so even if the system fails, the cubicle information can be transmitted to the monitoring server. In addition, since the capacity of the storage battery is also an emergency power source for the load, the capacity is relatively large.
Therefore, remote monitoring of cubicles can be continuously performed, and situations in which a manager rushes to the site every time a power failure occurs can be reduced.
In addition, since the storage battery is controlled so that the received power does not exceed a predetermined upper limit value, it is possible to reduce power charges, and since the storage battery is placed inside the cubicle, the power distribution equipment inside the cubicle is connected to the storage battery. can be easily implemented, and the installation space can be minimized.

1 is a configuration diagram showing an example of a cubicle monitoring system according to the present invention; FIG. 1 is a block diagram of an in-cubicle monitoring device; FIG. FIG. 3 is an explanatory diagram showing a power supply line in a cubicle using a storage battery as a power source; It is a block diagram of a management server.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments embodying the present invention will be described in detail with reference to the drawings. FIG. 1 is a configuration diagram showing an example of a cubicle monitoring system according to the present invention. The cubicle monitoring system includes a cubicle 1 housing high-voltage power receiving equipment, a power meter 2, a management server 3 for managing the cubicle, a weather server 4 for providing weather information, and the like.
The management server 3 is arranged on the cloud and connected to the cubicle 1, the electricity meter 2, and the weather server 4 via the communication network N.

The weather server 4 is a data server that provides weather information managed by the Japan Meteorological Agency or a meteorological operator, etc., and generally provides information such as the weather, temperature, wind direction, sunshine rate, etc. of each area divided into a plurality of areas throughout Japan. be done.

In addition to the high-voltage power receiving equipment, the cubicle 1 accommodates a cubicle monitoring device 10 that communicates with the management server 3 to transmit status information of the cubicle 1 to the management server 3 and obtain control information.
High-voltage power receiving equipment includes transformers that convert high-voltage power received from the grid to low-voltage power, high-voltage AC load switches, disconnecting switches, vacuum circuit breakers, current-limiting fuses, high-voltage phase-advancing capacitors, circuit breakers for wiring, transformers for instrumentation, etc. , which are housed (none of which is shown).
Also, a storage battery device 7 for supplying power to a load (not shown) in the event of a power failure is accommodated, and a photovoltaic power generation device 8 (FIG. 2) is connected to the cubicle 1 .

The storage battery device 7 includes, as shown in FIG. 2, a storage battery 71, a power conditioner (hereinafter referred to as a PCS) 72 for converting DC power into AC power and supplying it to a load in the reverse direction, and a power conditioner (PCS) 72, which will be described later. A storage unit 73 for storing the lower limit value and the like, a communication unit 75 for communicating with the monitoring control device 23, and the like are provided.
The PCS 72 has a function of controlling charging/discharging of the storage battery 71 and controls the remaining amount of stored electricity so that it does not fall below the lower limit value set by the monitoring control device 23 . In addition, the power generated by the photovoltaic power generation device 8 is converted into alternating current, and the converted alternating current power is supplied to a load or is reversely flowed to the system side. Furthermore, control is performed to convert AC power from the system into DC power and supply it to the storage battery 71 .

The load is supplied with power received from the system, and the power generated by the solar power generation device 8 and the DC power stored in the storage battery 71 are converted into AC power and supplied.

The watt-hour meter 2 is a smart meter having a function of transmitting received power information received from the grid to the outside. The management server 3 receives this information and notifies the monitoring control device 23 that the received power does not exceed the set upper limit. The upper limit value is the maximum demand value or a power value set lower than the maximum demand value, and is set by the consumer of the received power for the purpose of preventing or reducing the power rate. Incidentally, the communication device 26 may be integrated with the power meter 2 .

FIG. 2 shows a block diagram of the cubicle monitoring device 10. As shown in FIG. As shown in FIG. 2, the cubicle monitoring device 10 includes a data collection device (data collection means) 21 for acquiring state information of the cubicle 1, a contact information input device (contact information collection means) 22, and a monitoring control device ( transmission control means) 23.
The data collection device 21 has a first measurement device 21a that collects power-related physical data and a second measurement device 21b that collects temperature-related physical data. It collects physical data (state information) such as the voltage, current, and temperature of the equipment.

Specifically, the first measuring device 21a includes an input unit 51 for inputting measurement information, a first measuring device CPU 52 as a determination unit for controlling the measurement and determining whether the measured values are normal or abnormal, and whether the individual measured values are normal. / A storage unit (threshold storage unit) 53 for storing a threshold value for determining an abnormality, a communication unit 54 for communicating with the monitoring control device 23, and the like are provided.
The input unit 51 is connected to a plurality of voltage measuring devices, current measuring devices, leakage current measuring devices, etc., which are not shown, and outputs voltage information M1 on the high voltage side, current information M2 on the high voltage side, voltage information M3 on the low voltage side, current information M4, Transformer leakage current information M5 and the like are input. The first measuring device CPU 52 controls the first measuring device 21a and also serves as a power factor calculator, and calculates and outputs power and power factor including power consumption information of the load.

The second measuring device 21b includes an input unit 56 for inputting temperature information, a second measuring device CPU 57 as a determination unit for controlling measurement and determining normality/abnormality of measured values, and determining normality/abnormality of individual measured values. A storage unit (threshold storage unit) 58 for storing a threshold value for monitoring, a communication unit 59 for communicating with the monitoring control device 23, and the like are provided. Here, it is configured to communicate with the monitor control device 23 via the first measuring device 21a.
A temperature measuring device (not shown) is connected to the input unit 56, and oil temperature information T1 of the transformer, temperature information T2 inside the cubicle 1, and the like are input. The second measuring device CPU 57 controls the second measuring device 21b.

The contact information input device 22 collects various kinds of contact information (state information) in the cubicle 1 such as interruption information and alarm information. Specifically, the contact information input device 22 transmits the contact information obtained by communicating with the input unit 61 for inputting contact information, the contact information input device CPU 62 for converting the input information into predetermined identification data, and the monitoring control device 23. A communication unit 63 and the like are provided. Here, it is configured to communicate with the monitor control device 23 via the first measuring device 21a.
The input unit 61 contains disconnecting switch, vacuum circuit breaker, circuit breaker cutoff information S1, fuse information S2 such as current-limiting fuse fusing information, alarm information S3 of the insulation monitoring device 64, and leakage fire alarm 65. Contact information such as alarm information S4 is input.
The contact information input device CPU 62 outputs the contact information to the monitoring control device 23 when the contact information is input.

The monitoring control device 23 includes a first measuring device 21a, a first communication IF 41 that communicates with the storage battery device 7, a storage unit 42 that stores obtained data, an upper limit value, etc., a monitoring control device CPU 43 that controls the monitoring control device 23, a management A second communication IF 44 and the like for communicating with the server 3 are provided.
The first communication IF 41 of the monitor control device 23 may be configured to directly communicate with the second measurement device 21b and the contact information input device 22 as well as the first measurement device 21a. By doing so, the control load of the first measuring device 21a can be reduced. On the other hand, as shown in FIG. 1, by setting the communication destination of the monitoring control device 23 in the cubicle 1 to only the first measuring device 21a and the storage battery device 7, the monitoring control device 23 can be installed independently. Become.

The monitoring control device CPU 43 performs control to transmit the state information and the generated power information of the photovoltaic power generation device 8 obtained via the storage battery device 7 to the management server 3, and sets the upper limit value of the power received from the system. It has a function as a storage battery control unit that controls the charging and discharging of the storage battery device 7 so that the current does not exceed . In addition, when the system fails, control is performed to use the storage battery 71 as the power source for the cubicle monitoring device 10, and control is performed for a specific load to use the power generated by the storage battery device 7 and the solar power generation device 8 as the power source. It has a function as a power control unit.
It also has the function of a lower limit value setting unit, and sets the lower limit value, which is the lowest value of the remaining amount of electricity stored in the storage battery 71 of the storage battery device 7, based on the weather forecast information (sunshine information) transmitted from the management server 3. It is transmitted to the storage battery device 7 .

FIG. 3 shows power supply lines in the cubicle 1 using the storage battery 71 as a power source. L1 is a DC power line, L2 is a power line to the cubicle monitoring device 10, L3 is a system connection side power line, and a power supply circuit 25 is a circuit that supplies power to the load and the system. As shown in FIG. 3 , power is supplied from a storage battery 71 to each device constituting the cubicle monitoring device 10 . Power is supplied to the cubicle monitoring device 10 by automatic switching in the event of a power failure.

In this way, when the system fails, the storage battery 71 is used as a power source to operate the cubicle monitoring device 10. Therefore, the operation of the monitoring control device 23 is continued to manage the information of the cubicle 1 even if the system fails. Can be sent to server 3. In addition, since the capacity of the storage battery 71 is also an emergency power source for the load, the capacity is relatively large. .
Therefore, the remote monitoring of the cubicle 1 can be continuously performed, and the situation in which the administrator rushes to the site every time a power failure occurs can be reduced.
In addition, since the storage battery 71 is arranged inside the cubicle 1 and the PCS 72 is also installed inside the cubicle 1, the wiring work between the power distribution equipment inside the cubicle 1 and the storage battery equipment 7 can be simplified, and the installation space for the power equipment can be minimized. can be done.

FIG. 4 shows a block diagram of the management server 3. As shown in FIG. As shown in FIG. 3, the management server 3 stores a storage unit 31 for storing data transmitted from a plurality of managed cubicles 1, and a region (area) including locations where the cubicles 1 are installed. An area information storage unit 33, a cubicle information storage unit 32 that stores the received power capacity of the cubicle 1, the power storage capacity of the storage battery device 7, the power generation capacity of the solar power generation device 8, etc., and the load power prediction unit 34 that predicts the power used by the load. , a power generation prediction unit 35 that predicts the power generation amount of the photovoltaic power generation device 8, a management server CPU 36 that controls the management server 3, a management server communication that communicates with the cubicle monitoring device 10, the electricity meter 2, etc. via the communication network N IF37 etc. are provided.

The cubicle monitoring system configured as described above operates as follows. However, here, the control of the storage battery device 7 by the management server 3 will be mainly described.
The management server 3 receives voltage information M1, M3, current information M2, M4, leakage current information M5, power information such as load power usage information, and oil temperature information of predetermined parts from the monitoring control device 23 of the cubicle 1. Contact information such as information T1, temperature information T2, cut-off information S1, fuse information S2, and alarm information S3 and S4 are transmitted and stored in the storage unit 31. FIG.

The management server 3 that has received such various information transmits the following information to the cubicle 1 based on the obtained information.
The management server 3 notifies the monitoring control device 23 of the received power information obtained from the watt-hour meter 2 . The monitoring control device 23 compares the transmitted received power information with the set upper limit value, and if it determines that the received power is about to exceed the upper limit value, it issues an instruction to the storage battery device 7 to increase the output, and the load part of the power is supplied from the storage battery 71 .
In this manner, the charging and discharging of the storage battery 71 is performed so that the power received from the grid does not exceed the predetermined upper limit value, so the power rate can be reduced.

Also, the cubicle 1 is notified of the predicted value of the amount of power generation to be output to the cubicle 1 by the photovoltaic power generation device 8 based on the obtained weather forecast information, for example. Specifically, the weather forecast information (sunshine duration information, temperature information, wind speed information, etc.) for the area where the cubicle 1 is installed is obtained from the weather server 4, and the power generation amount for the next day is calculated based on, for example, the sunshine duration forecast for the next day. Predict. The management server 3 accumulates past power generation data of the photovoltaic power generation device 8, and based on the data, the power generation prediction unit 35 predicts the power generation from the hours of sunshine.

Furthermore, the management server 3 predicts the power consumption of the load and notifies the monitoring control device 23 of it. Specifically, the storage unit 31 of the management server 3 constitutes a load power information storage unit that accumulates past power usage data of the load. It predicts the amount of power consumption and the power consumption for each predetermined time, and notifies the prediction information of the power consumption for the next day, for example.

In the monitoring control device 23 that has received the power generation prediction information and the power consumption prediction information, the monitoring control device CPU 43 sets the lower limit value of the storage battery 71 and notifies the storage battery device 7 of the lower limit value. For example, if the amount of power generated the next day is sufficient to charge the storage battery 71 and the power consumption of the load is the same as usual, the lower limit value for the day is set as low as 10% of the full charge, and the storage battery 71 is discharged to utilize the power. However, if it is determined that the next day's load power usage forecast will be higher than a normal day, the lower limit of the storage battery 71 for that day is set to 20%, which is higher than usual, in consideration of the peak shift of the power received from the grid.
Conversely, if the power generation amount forecast value for the next day notified by the management server 3 is insufficient to charge the storage battery 71 and the power consumption of the load does not change from normal, the lower limit value for the day is set as high as, for example, 40% of full charge to prepare for power shortage the next day. However, if the load power consumption forecast for the next day is larger than that for a normal day, the lower limit value for that day is set to a larger value, for example, 50%.

In this way, the lower limit value of the remaining amount of electricity stored in the storage battery 71 is set according to the weather conditions. Therefore, for example, when a sufficient amount of power generation cannot be expected for the time being due to continuous rain, control to set a large lower limit value is performed. By implementing this, it is possible to prepare for emergencies such as power outages, or if fine weather continues, the lower limit value can be set low and control can be performed so that the stored power is utilized, and the storage battery 71 can be used effectively.
In addition to the weather information, the power to be supplied to the load is predicted to set the lower limit of the remaining power amount, so the storage battery 71 can be used more effectively.

In the above-described embodiment, the storage battery device 7 and the solar power generation device 8 of the consumer can be managed on the cloud side, so charging/discharging control in cooperation with the aggregator of the virtual power plant can be easily performed. Also, if weather information predicts a power outage (typhoon, torrential rain, etc.), it is also possible to automatically change the battery level of the storage battery device 7 to a larger battery level than usual to secure capacity. Therefore, it is possible to use storage batteries that have a high economic effect at all times, and to prepare for emergencies. is installed with an EMS (Energy Management System), the monitoring control device 23 may be incorporated into the EMS.

1 Cubicle 2 Power meter 3 Management server 4 Weather server 7 Storage battery device 8 Photovoltaic power generation device 10 Cubicle monitoring device 21 Data Collection device (data collection means) 23 Monitoring control device 31 Storage unit (load power information storage unit) 34 Load power prediction unit 35 Power generation prediction unit 36 Management server CPU 37.. Management server communication IF (received power information acquisition unit, weather information acquisition unit), 43.. Monitoring control unit CPU (storage battery control unit, power supply control unit).

Claims (3)

A cubicle that houses high-voltage power receiving equipment that receives high-voltage power from a system and supplies the low-voltage power converted to a load, and a management server that is placed on the cloud and stores and manages the state information of the cubicle. A cubicle monitoring system comprising:
The cubicle includes a storage battery for supplying power to at least part of the load when the system fails, and
a cubicle monitoring device that transmits the state information to the management server;
The cubicle monitoring device includes data collection means for measuring and collecting physical data including voltage values and current values of predetermined portions of the cubicle, which are part of the state information;
A monitoring control device that controls charging and discharging of the storage battery and communicates with the management server,
The management server has a received power information acquisition unit that acquires measured value information from a power meter that measures the received power supplied from the system to the cubicle,
The monitoring control device obtains the received power information from the management server and controls charging and discharging of the storage battery so that the received power does not exceed a predetermined upper limit;
A cubicle monitoring system comprising: a power control unit for supplying power to the cubicle monitoring device from the storage battery to maintain the function of the cubicle monitoring device when the system fails. The cubicle converts the DC power generated by the photovoltaic power generation device and the DC power stored in the storage battery into AC and supplies it to the load, and converts the AC power from the system into DC and supplies it to the storage battery. A power conditioner is placed
The management server includes a weather information acquisition unit that acquires weather forecast information for an area in which the cubicle is installed, and a power generation prediction unit that predicts the power generated by the solar power generation device to be supplied to the cubicle from the acquired weather forecast information. and
The monitoring control device obtains prediction information of the power generated by the solar power generation device from the management server, and sets a lower limit value of the remaining power amount of the storage battery based on the prediction information. Item 2. The cubicle monitoring system according to item 1. The state information transmitted by the monitoring and control device to the management server includes information on power consumption supplied to the load,
The management server includes a load power information storage unit that stores the received power usage information;
a load power prediction unit that predicts the power consumption of the load for a predetermined time from now based on the past power consumption information, and transmits the prediction information of the power consumption to the monitoring control device;
3. The cubicle monitoring system according to claim 1, wherein the monitoring control device sets a lower limit value of the remaining power amount of the storage battery based on the prediction information.

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