JP2010177798A - Meter reading system using power-line carrier communication - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve reliability and throughput of a meter read signal of a meter reading system using a power-line carrier communication by reducing an influence of a transformer on communication of the meter reading system using the power-line carrier communication. <P>SOLUTION: In the meter reading system using the power-line carrier communication in a collective building 1 having a plurality of loads powered by a plurality of transformers 1Tr1 to 1Tn having load sides connected to one another, some of the plurality of transformers differ in capacity and a power monitoring control unit 1PMC is provided which finds the total of use electric energies of the respective loads and selects the smallest number of transformers to supplement the total use electric power, so that only the selected transformers are placed in operation. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a metering system using power line communication for use in an apartment house that supplies power to a load by a plurality of transformers.

There is a concept of a power line carrier communication utilization metering system used in an apartment house that supplies power to a load by a plurality of transformers.
The meter reading system includes a system that remotely measures the amount of metered objects such as electric power, gas, and water. Recently, the metered amount data individually metered using power line communication called PLC (Power Line Communication). Have been developed to collect. (See JP 2006-180021 A)

Japanese Patent Laying-Open No. 2006-180021 (FIG. 1 and description thereof)

When collecting individually measured needle amount data using power line carrier communication, the detected needle amount data is transmitted by the high frequency carrier superimposed on the distribution line, but transmitted from the transmission side of the measured needle amount data The communication signal is characterized in that it is transmitted in a broadcast manner from the distribution network in the housing complex, from the distribution wires in the housing complex to each of a plurality of transformers in the housing complex, and from each transformer to the distribution lines.
Here, it has been known that the transformer causes attenuation and reflection (noise) of the communication signal of the needle amount data, and has an unfavorable influence on the reliability and throughput of the communication signal.
Therefore, in the metering system using power line carrier communication used in an apartment house or the like that supplies power to a load by a plurality of transformers, it is preferable to take some examination / measures for the transformer.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to reduce the influence of a transformer on communication in a power line carrier communication utilization meter reading system.

  The power line carrier communication utilization meter reading system according to the present invention is a power line carrier communication utilization meter reading system in a collective building having a plurality of loads fed by a plurality of transformers whose loads are connected to each other. A power monitoring and control device that calculates the total amount of power used by each load, selects the minimum number of transformers that satisfy the total power consumption, and operates only the selected transformer. It is provided.

  This invention is a power line carrier communication utilization meter reading system in a collective building having a plurality of loads fed by a plurality of transformers connected to each other on the load side, there are those of different capacity among the plurality of transformers, Since the minimum number of transformers for obtaining the total amount of power used for each load is found and the total amount of power used is selected, and the power monitoring and control device that operates only the selected transformer is provided, the power line carrier communication is used. This has the effect of improving the reliability and throughput of the meter reading signal in the meter reading system.

It is a figure which shows Embodiment 1 of this invention, and is a figure which shows an example of the system configuration | structure of a power-line carrier communication utilization meter-reading system. It is a figure which shows Embodiment 1 of this invention, and is operation | movement explanatory drawing of the principal part of the power line carrier communication utilization meter-reading system of FIG. It is a figure which shows Embodiment 1 of this invention, and is a figure which illustrates the change of the total load amount of the electric power load in a large-scale apartment house, a high-rise building, etc. for one day. It is a figure which shows Embodiment 2 of this invention, and is a figure which shows the example of other system structures of a power-line carrier communication utilization meter-reading system. It is a figure which shows Embodiment 3 of this invention, and is a figure which shows the example of another system structure of the power-line carrier communication utilization meter-reading system.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to FIGS.

  As illustrated in FIG. 1, a large-scale apartment house, a high-rise building 1 is provided with a plurality of transformers 1Tr1 to 1Trn that are operated in parallel, and from the secondary side of the transformers 1Tr1 to 1Trn, Distribution lines for supplying power to the loads 1L1 to 1Ln are wired in the apartment house and the high-rise building 1.

  The transformers 1Tr1 to 1Trn are configured as transformers whose loads are connected to each other and have different capacities.

  Circuit breakers 11CB1 to 11CBn and 12CB1 to 12CBn are provided on the primary and secondary sides of the transformers 1Tr1 to 1Trn.

  The primary side of the transformers 1Tr1 to 1Trn is connected to the substation transformer STr in which the circuit breakers are installed on the primary side and the secondary side via the circuit breakers 11CB1 to 11CBn.

  The power consumption of each of the loads 1L1 to 1Ln is measured by a corresponding watt hour meter (hereinafter abbreviated as WHM) 11WH1 to 11WHn, and the measured power amount is not shown in the figure, but a known power line carrier communication is performed. The data is collected and transmitted to the central monitoring and control device of the management company via a power line or a dedicated line.

  An apartment house power monitoring and control device 1PMC that collects each measured amount of WHM11WH1 to 11WHn is provided in the apartment house / high-rise building 1. This collective housing power monitoring and control device 1PMC calculates the total power consumption of the collective housing and high-rise building 1 (the aggregate value of the measured amounts of WHM11WH1 to 11WHn) from the collected measured amounts of WHM11WH1 to 11WHn in real time by the arithmetic unit. And the calculation result is stored in a storage device. The result stored in the storage device is stored for a predetermined period.

The apartment house power monitoring and control device 1PMC compares the capacities of the transformers 1Tr1 to 1Trn registered in advance with the total power consumption of the apartment house and the high-rise building 1 derived by the calculation, and at that time Calculate and select the combination of the smallest number of transformers that satisfies the overall power consumption. This selection result is sent to the switching control device 1OCC, and the switching control device 1OCC operates a circuit breaker on the primary side of the transformer other than the selected transformer, and collects housing from only the selected transformer. Power is supplied to the loads 1L1 to 1Ln of the high-rise building 1.
The circuit breaker on the secondary side of the transformer may be cut off.

  The daily change in the total load amount (total amount of power used) LT of the power load in a large-scale apartment house, high-rise building 1 or the like is as illustrated in FIG. Except for several hours before and after the hour, the total load LT is significantly reduced.

  During the time period when the total load LT is significantly reduced, the circuit breaker on the primary side of the transformer other than the selected transformer is cut off, and the loads 1L1 to 1Ln are fed only by the selected transformer. To do.

  During the time period when the total load LT is significantly reduced, only the selected transformer is operated and the number of operating transformers is small. Therefore, the communication signal of the power line carrier communication of the transformer is correspondingly reduced. The impact on is small. Therefore, if meter reading data is collected and transmitted in a time zone when the number of operating transformers is small, the reliability and throughput of the meter reading signal in the power line carrier communication utilizing meter reading system can be improved.

  For example, in FIG. 1, for example, the transformers 1Tr1 to 1Tr3 are AkVA transformers having the same capacity, the transformer 1Tr4 is an A / 2 capacity transformer, and the transformer 1Trn is an A / 4 capacity transformer. .

  The operation will be described below with specific numerical values.

  For example, it is assumed that transformers 1Tr1 to 1Tr3 are each equipped with a 100 kVA transformer, 1Tr4 is a 50 kVA transformer, and transformer 1Trn is a 25 kVA transformer. In this case, the total load LT of the housing complex can be calculated every 25 kVA, and can be handled by the combination of the following (1) to (15) by the above selection, and it is possible to stop the transformers other than the capacity that needs to be operated. This improves the reliability and throughput of the meter reading signal in the meter reading system using power line carrier communication. In addition, the loss of the transformer itself (copper loss, iron loss, distribution line loss, etc.) with respect to the required load can be finely minimized.

(1) When the total load is 0-25 kVA, the transformer to be operated is 1 Trn
(2) When the total load is 25-50 kVA, the transformer to be operated is 1Tr4
(3) When the total load is 50-75 kVA, the transformer to be operated is 1Tr4 + 1Trn
(4) When the total load is 75-100 kVA, the transformer to be operated is 1Tr1
(5) When the total load is 100-125 kVA, the transformer to be operated is 1Tr1 + 1Trn (6) When the total load is 125-150 kVA, the transformer to be operated is 1Tr1 + 1Tr4 (7) When the total load is 150-175 kVA The transformer to be operated is 1Tr1 + 1Tr4 + 1Trn
(8) When the total load is 175-200 kVA, the transformer to be operated is 1Tr1 + 1Tr2 (9) When the total load is 200-225 kVA, the transformer to be operated is 1Tr1 + 1Tr2 + 1Trn
(10) When the total load is 225 to 250 kVA, the transformer to be operated is 1Tr1 + 1Tr2 + 1Tr4
(11) When the total load is 250-275 kVA, the transformer to be operated is 1Tr1 + 1Tr2 + 1Tr4 + 1Trn
(12) When the total load is 275-300 kVA, the transformer to be operated is 1Tr1 + 1Tr2 + 1Tr3
(13) When the total load is 300-325 kVA, the transformer to be operated is 1Tr1 + 1Tr2 + 1Tr3 + 1Trn
(14) When the total load is 325 to 350 kVA, the transformer to be operated is 1Tr1 + 1Tr2 + 1Tr3 + 1Tr4
(15) When the total load is 350 to 375 kVA, the transformer to be operated is 1Tr1 + 1Tr2 + 1Tr3 + 1Tr4 + 1Trn

  An example of the operations (1) to (15) described above with reference to a flowchart is as shown in FIG. ST in FIG. 2 means each processing step in the apartment housing power monitoring and control device 1PMC. Note that FIG. 2 illustrates the above-described (1) to (5) from the relation of the paper surface, and (6) to (15) are not illustrated.

  In some cases, transformers 1Tr1 to 1Trn may have the same capacity, but the same applies in that case.

  That is, this Embodiment 1 is a power line carrier communication utilization meter-reading system in the collective building 1 having a plurality of loads fed by a plurality of transformers 1Tr1 to 1Trn whose load sides are connected to each other. ~ 1Trn has different capacities, finds the total amount of power used by each load, selects the minimum number of transformers that satisfy the total power consumption, and operates only the selected transformer A monitoring control device 1PMC is provided.

  In addition, in the first embodiment, in another aspect, in the metering system using power line carrier communication in the collective building 1 having a large number of loads fed by the plurality of transformers 1Tr1 to 1Trn, the plurality of transformers are arranged. A power monitoring control device 1PMC is provided that has different capacities, selects a transformer that obtains the total amount of power used by each load, satisfies the total power consumption, and stops operation of the unselected transformers. .

Embodiment 2. FIG.
The second embodiment of the present invention will be described below with reference to FIG.

  In FIG. 4, the measured values of the individual load watt hour meters WH11 to WH14 of the residential distribution line 12DF1 and the individual load watt hour meters WH21 to 11WH25 of the residential distribution line 12DF2 of the apartment house 1 are the PLC slave units ( Power line carrier communication device) 1 PLCS 11 to 1 PLCS 14, 1 PLCS 21 to 1 PLCS 25, PLC main unit (power line carrier communication device) 1 PLCM is transmitted by power line carrier communication to remote electric meter server IPMS for meter reading The collected measured amount (the amount of needles to be measured) is transmitted to power management companies such as electric power companies, gas companies, water departments, and central monitoring and control devices CPMC of sales offices using power line carrier communications and dedicated lines. The

  The second embodiment is an example in which the apartment house power monitoring and control device 1PMC described above in the first embodiment is incorporated in the electric room server IPMS for remote meter reading. In other words, the load amount determination processing and transformer selection processing functions illustrated in FIG. 2 are added to the remote meter reading electric room server IPMS, and the load amount is small and the number of operating transformers is reduced or reduced to the minimum number. In the selected state, at least one of transmission from each watt-hour meter WH11, WH12,... To the electrical room server IPMS and transmission from the electrical room server IPMS to the central monitoring controller CPMC is performed. This is an example.

Embodiment 3 FIG.
The third embodiment will be described below with reference to FIG.

  The power system of an apartment building is basically composed of one building unit, and each building unit is equipped with substation facilities (multiple transformers) to supply power.

  In the third embodiment, an efficient control of the number of transformers can be realized by adopting a configuration that spans buildings as a substation facility.

  Specifically, as illustrated in FIG. 5, for example, the parallel operation connections on the load side of the transformers 1Tr1 to 1Trn of the apartment house 1 of the first building and the transformers 2Tr1 to 2Trn of the apartment house 2 of the second building, for example. The lines 1CF1-n and 2CF1-n are further connected by a connection line 1-2CF, and the apartment house power monitoring and control device 1PMC and the switching controller 1OCC are shared by the first apartment house 1 and the second apartment house 2. This is an example.

  Sharing the switch control device 1OCC means that the switch control device 1OCC can control all the switches of the multiple dwelling houses. To share the common apartment house power monitoring and control device 1PMC, the total amount of power consumed by all loads of the apartment buildings in multiple buildings is calculated, and the minimum number of transformers that satisfy the total power consumption is used in the apartment buildings in the multiple buildings. This means that the common apartment house power monitoring and control device 1PMC is controlled so that only the selected transformer is operated.

  For example, if the capacity of the transformer 1Tr1-1Trn in the first building is 100, 100, 100, 50, 25kVA and the capacity of the transformer 2Tr1-2Trn in the second building is 100, 100, 50, 25, 12kVA, Based on the meter reading data collected by meter reading, the total power LT of the two houses can be grasped, and the number of transformers can be controlled more finely based on the data, and the reliability of the meter reading signal in the meter reading system using power line carrier communication, Throughput is improved. At the same time, the transformer's own loss (copper loss, iron loss, distribution line loss, etc.) with respect to the required load can be finely minimized.

  That is, in the third embodiment, the power monitoring and control device 1PMC is shared by the multiple buildings 1 and 2 in a plurality of buildings, and the transformers 1Tr1 to 1Trn in the multiple buildings 1 and 2 in different buildings. , 2Tr1 to 2Trn are connected to each other, and the power monitoring controller 1PMC controls the plurality of transformers 1Tr1 to 1Trn and 2Tr1 to 2Trn of the collective buildings 1 and 2 in a plurality of buildings.

  In addition, in each figure of FIGS. 1-5, the same code | symbol shows the same or an equivalent part.

1 collective housing (collective building),
2 collective housing (collective building),
1Tr1 to 1Trn transformer,
2Tr1-2Trn transformer,
IPMC apartment house power monitoring and control device,
1OCC Open / close control device.

Claims (3)

In the meter reading system using power line carrier communication in a collective building having a plurality of loads fed by a plurality of transformers connected to each other on the load side,
Some of the transformers have different capacities,
A power line provided with a power monitoring and control device that calculates the total amount of power used for each load, selects a minimum number of transformers that satisfy the total power consumption, and operates only the selected transformers Metering system using carrier communication. In the power line carrier communication utilization meter reading system according to claim 1,
A meter reading system using power line carrier communication, characterized in that the power monitoring and control device is provided in a server of a meter reading system for storing the measured meter reading amount. In the power line carrier communication utilization meter-reading system according to claim 1 or 2,
The power monitoring and control device is shared by a plurality of the building buildings,
The load sides of the transformers of the collective buildings in different buildings are connected to each other,
The power monitoring and control device controls a plurality of the transformers of the collective building of a plurality of buildings.

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