JP2003084017A - Energy management system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an energy management system capable of confirming the transformer load factor of a high voltage power substation. SOLUTION: This energy management system includes a power measuring part A capable of measuring the apparent energy of the high voltage receiving transformer station X, a storage part B for taking a difference in data of the apparent energy measured by the power measuring part in each time unit and accumulating the same, and a telephone circuit communicating part D1 for realizing the communication through the telephone circuit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an energy management system capable of measuring and accumulating apparent electric energy of high voltage power receiving and transforming equipment and grasping a transformer load factor.

[0002]

2. Description of the Related Art In recent years, fuel resources and CO
Reduction of power demand is required for global environment protection such as prevention of global warming by reduction of ₂ , and management of power demand has become more important than ever.

As a current energy management method, the amount of power demanded from a power company per month is distributed to the power user as an electricity rate statement together with the maximum power demand for the past year, and the power user side is the above-mentioned. It is mainly to manage the amount of power demand and study energy conservation measures only with the electricity bill.

[0004]

However, in the conventional management of the amount of electric power, the electric power user side has been
Since it is not possible to manage the amount of electricity in a relatively short period such as one day, it is not possible to grasp the apparent amount of electricity in the high-voltage power receiving and transforming equipment on an hourly basis.

Therefore, the conventional electric energy management cannot grasp the daily transformer load factor. Therefore, it was not possible to perform highly accurate calculations such as heat loss generated in the transformer, and it was not possible to study more effective energy saving measures.

In view of the above problems, it is an object of the present invention to provide an energy management system capable of confirming the transformer load factor of high voltage power receiving and transforming equipment.

[0007]

In order to achieve the above object, the first energy management system of the present invention is a power measuring unit capable of measuring the apparent electric energy of equipment, and the apparent electric power measured by the electric power measuring unit. The electric power facility is provided with a storage unit for accumulating quantity data for each time unit and a telephone line communication unit for realizing communication through the telephone line network, and a totalizing unit and a telephone line network for aggregating apparent electric energy data from the electric power facility. Has a telephone line communication unit that realizes communication through a telephone line as a management facility, and the aggregating unit can calculate a transformer load factor from the data of the apparent power amount, and the power facility and the management facility are connected via a telephone line network. Communication is possible.

In addition, in addition to the first energy management system, the second energy management system of the present invention includes a wireless communication means for performing wireless communication instead of the telephone network.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION According to the first energy management system of the present invention, since apparent power data for each unit time can be grasped, it is possible to grasp a transformer load factor in a relatively short period of time. Becomes

According to the second energy management system of the present invention, since the wireless communication is used, the construction of this management system is simplified.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. Reference numeral 1 is a high-voltage power receiving and transforming equipment, and this high-voltage power receiving and transforming equipment is denoted by reference numeral 7 as shown in FIG. It is composed of a vacuum circuit breaker, a high-voltage switch shown by reference numeral 8, a wiring breaker shown by reference numeral 9, a single-phase transformer shown by reference numeral 10, and a three-phase transformer shown by reference numeral 11. The single-phase transformer is used for electric lights, and the three-phase transformer is used for power.

Reference numeral 2 indicates a power measuring unit, which is a display unit indicated by reference numeral 12, a data input / output unit indicated by reference numeral 13 and a CPU indicated by reference numeral 14, as shown in FIG. It is composed of a (memory) unit and a sensor indicated by reference numeral 15. The sensor measures the current, voltage, and the like of the high-voltage power receiving and transforming equipment, displays the measured value on the display unit, and plays the role of calculating the apparent power amount according to the method of calculating the apparent power amount by the power measuring unit described later. Also, RS-485
It can be connected to an external device through a line and plays a role of outputting data in response to a data request from the external device.

Reference numeral 3 indicates an accumulating section, which is a data input / output section indicated by 16-1 and 16-2 and a CPU (memory) indicated by 17 as shown in FIG.
It is composed of parts. An RS-485 line can be used to connect to an external device, and the line can be used to connect to the power measuring unit to obtain data every hour,
The storage unit performs a calculation and storage process in accordance with a method of calculating and storing 1-hour data of apparent electric energy by the storage unit, which will be described later. Also, RS-23
It can be connected to an external device via a 2C line and plays a role of outputting data in response to a data request from the external device.

In the present embodiment, the power measuring unit and the storage unit are one data manager, and are installed as power equipment on the customer side.

Reference numeral 4 indicates a totaling section, which is, as shown in FIG. 6, a display section indicated by reference numeral 18 and a reference numeral 1.
A data input / output unit indicated by 9 and a CP indicated by 20
It is composed of a U (memory) unit. It is possible to connect to an external device through an RS-232C line, connect to the telephone line communication unit indicated by reference numeral 5-2 using this line, and connect to the storage unit via the telephone line, The data stored in the storage unit is acquired every hour, and the data is stored by performing the calculation and storage processing according to the calculation method and storage method of the load factor of the transformer in the totaling unit. The totaling unit is a server that manages data, and the totaling unit plays a role of calculating the load factor of the transformer from the apparent power according to the calculation method and the storage method of the load factor of the transformer in the totalizing unit described later.

Further, reference numerals 5-1 and 5-2 are telephone line communication units for connecting the customer side and the totaling unit by telephone lines.
Plays the role of data communication.

Next, the operation of the energy management system shown in FIG. 1 will be described.

The power measuring unit periodically measures the current, voltage, active power amount, reactive power amount, apparent power amount, etc. of the high voltage receiving and transforming equipment. The measured data is not stored.

The storage unit stores the current, voltage, active power amount, reactive power amount, apparent power amount, etc. measured by the power measuring unit as 1
Data is acquired from the power measuring unit at each time, and calculation and accumulation processing is performed according to the calculation method and accumulation method of 1-hour data of apparent electric energy by the accumulation unit described later to accumulate the data. Since the accumulated data is accumulated for a certain holdable period, even if the data acquisition operation is performed from the power measuring unit, the accumulated data continues to be accumulated for the holdable period.

Then, the totaling unit is connected to the storage unit through a telephone line to obtain data. Furthermore, the acquired data accumulates the apparent electric energy for each hour as text data, and automatically calculates the transformer load factor.

From this transformer load factor data, it is possible to grasp the load status for each time zone. Further, as shown in FIG. 7, the apparent electric energy data for one hour is summed up for one day (step 701), and the average data for one day is calculated from the total data (step 702). Then, the transformer load factor is automatically calculated (step 703) and the data is saved as a daily data file (step 704). This data makes it possible to grasp the daily load situation. Further, as shown in FIG. 8, the total data of the apparent electric energy of one day is set as the one day data of the January data, and the apparent electric energy data of one day is totaled for one month (step 801). Monthly average data is calculated (step 802), and this average data is divided by the transformer capacity to automatically calculate the transformer load factor (step 80).
3) Save the data as a monthly data file (step 804). With this data, it is possible to understand the monthly load status. Further, as shown in FIG. 9, the total data of apparent electric energy in January is set as January data of 1-year data, and
The apparent energy data for the month is added up for one year (step 90
1) Calculate the average data for one year from the total data (step 902), divide the average data by the transformer capacity to automatically calculate the transformer load factor (step 903), and save the data as an annual data file (step). 90
4). From this data, it is possible to grasp the load situation for each year.

In addition, the text data can be aggregated to create graph data such as bar graphs and line graphs, and the time, day, or month under high load can be easily specified from the graph data. You can In addition, although there are multiple transformers in the high voltage receiving and transforming equipment, it is possible to grasp the load status of each transformer and plan efficient energy saving measures.

Further, since the data is accumulated in the accumulating unit, even if the totalizing data is accidentally deleted in the totalizing unit, the totalizing unit can sum up from the data of the energy storage device again. Therefore, it is possible to handle erroneous operations and restore data.

Next, in the present embodiment, the method of calculating the apparent electric energy by the power measuring unit, the method of calculating and accumulating the 1-hour data of the apparent electric energy by the accumulating unit, and the calculation of the load factor of the transformer in the aggregating unit. The storage method will be described.

As shown in FIG. 10, the power measuring unit calculates the sampling interval from the input frequency (step 100
1) measure voltage, current, etc. at the sampling interval (step 1002), calculate apparent power from the measured voltage and current without using power factor (step 1003),
The apparent power is calculated by cumulative addition (step 100).
4). The cumulatively added apparent electric energy is data for which the hourly difference processing is not performed.

In the storage unit, as shown in FIG. 11, data such as current, voltage, active power amount, reactive power amount, apparent power amount, etc. are obtained from the power measuring unit every hour (step 110).
1) For the apparent electric energy, a difference process of the acquired data value and the previously acquired data value is performed (step 110).
2) Accumulate as 1-hour data (step 110)
3).

As shown in FIG. 12, the totaling unit connects to the storage unit through the telephone line communication unit (step 120).
1) Obtain data from the storage unit (step 120
2) The obtained apparent electric energy for each hour is totaled for one day (step 1203), the average value for one day is calculated (step 1204), and the average value is divided by the transformer capacity value for one day. Calculate the transformer load factor of (Step 1
205), accumulate the data.

Further, when changing the day, a process of creating month data from the day data is performed (step 1206), and when changing the month, a process of creating year data from the month data is performed (step 1207).

According to the second energy management system,
In the above-described embodiment, wired communication is performed through the telephone line network, but in this embodiment, since wireless communication is possible, line laying work is unnecessary. Furthermore, the system can be installed even in an environment where it is difficult to install a line.

A PHS network or a mobile telephone network can be used for wireless communication.

[0032]

According to the energy management system of the present invention, the apparent electric energy for each hour is accumulated, the transformer load factor is automatically calculated, and the load status for each time zone, the daily load status, and the monthly load status are obtained. , You can grasp the load situation year by year.
Also, although there are multiple transformers in the high voltage power receiving and transforming equipment, it is possible to grasp the load status of each transformer.
Can make efficient energy-saving measures.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing a configuration of a first energy management system of the present invention.

FIG. 2 is a functional block diagram showing a configuration of a second energy management system of the present invention.

FIG. 3 is a block diagram of high-voltage power receiving and transforming equipment in the energy management system of the present invention.

FIG. 4 is a block diagram of a power measuring unit in the energy management system of the present invention.

FIG. 5 is a block diagram of a storage unit in the energy management system of the present invention.

FIG. 6 is a block diagram of an aggregating unit in the energy management system of the present invention.

FIG. 7 is a flowchart showing an operation of creating a daily data file by a totalizing unit in the energy management system of the present invention.

FIG. 8 is a flowchart showing an operation of creating a monthly data file by a totalizing unit in the energy management system of the present invention.

FIG. 9 is a flowchart showing an annual data file creating operation of the totalizing unit in the energy management system of the present invention.

FIG. 10 is a flowchart showing a schematic operation of a power measuring unit in the energy management system of the present invention.

FIG. 11 is a flowchart showing a schematic operation of a storage unit in the energy management system of the present invention.

FIG. 12 is a flowchart showing a schematic operation of a tallying unit in the energy management system of the present invention.

[Explanation of symbols]

1 High-voltage power receiving and transforming equipment 2 Electric power measuring unit capable of measuring current, voltage, apparent electric energy, etc. 3 Acquiring data from the electric power measuring unit, and accumulating unit 4 for accumulating data such as apparent electric energy for each time unit. Data acquisition from the storage unit, and aggregation units 5-1 and 5-2 that collect data such as apparent electric energy. Telephone line communication units 6-1 and 6-2 that realize communication through the telephone line network. Realizing wireless circuit communication unit 7 Vacuum circuit breaker installed in high voltage power receiving and transforming equipment 8 High voltage switch installed in high voltage power receiving and transforming equipment 9 Circuit breaker 10 installed in high voltage power receiving and transforming equipment For high voltage power receiving and transforming equipment Single-phase transformer 11 installed Three-phase transformer 12 installed in high-voltage power receiving and transforming equipment 12 Display unit held by the power measuring unit 13 Data input / output unit 14 held by the power measuring unit CPU (memory) unit held by the power measuring unit 15 electric Sensors 16-1 and 16-2 held by the measurement unit Data input / output unit 17 held by the storage unit CPU (memory) unit 18 held by the storage unit Display unit 19 held by the counting unit Data input / output held by the counting unit Unit 20 CPU (memory) unit held by the totaling unit

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroshi Sawamura             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Hiromitsu Hara             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd.

Claims (4)

[Claims] 1. A power measuring unit capable of measuring the apparent electric energy of equipment, a storage unit for accumulating the data of the apparent electric energy measured by the electric power measuring unit for each time unit, and communication through a telephone network are realized. And a telephone line communication unit that realizes communication through the telephone line network as a management facility. An energy management system capable of calculating a transformer load factor from data of the apparent electric energy, and enabling communication between the power equipment and the management equipment through a telephone network. 2. The energy management system according to claim 1, wherein the apparent electric energy data is accumulated by taking a difference for each time unit. 3. The energy management system according to claim 1, further comprising a wireless communication unit that wirelessly communicates in place of the telephone network. 4. The energy management system according to claim 1, wherein the wireless communication means is a PHS network or a mobile phone network.