JPS6156694B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a highly efficient operation control method of a transformer for the purpose of energy saving.

Conventionally, in order to achieve this kind of purpose, the transformers 1, 2, and 3 shown in Figure 1B are controlled according to a predetermined program for each time period as shown in Figure 1B, using a scheduled operation control method. Therefore, the number of transformers is controlled, and switching devices 4, 5, and 6 as shown in FIG. 1B are used as control objects for controlling the number of transformers.

Next, its operation will be explained. That is, the first
The one shown in Figure A is an example of a schedule that shows how many transformers out of multiple transformers should be turned on from and to what time within a day.
Looking at the time period from 9:00 to 12:00, two transformers are turned on, so switchgears 4 and 5 in Figure 1B are turned on (ON), and switchgear H6 is opened (OFF). ing.

Also, if you look at the time period from 12:00 to 13:00, one transformer is turned on, so only switchgear 4 in Figure 1 B is turned on (ON), and switchgears 5 and 6 are opened. (OFF).

In this way, conventionally, a plurality of transformers are operated according to a preset operating schedule to operate the transformers in response to fluctuations in received power.

However, the conventional transformer schedule operation control method was created with the above idea in mind.
The number of transformers is controlled regardless of the load factor (how the current load is applied to the power transmission capacity) at that time, and depending on the number of transformers in operation, the load capacity may be greater than the power supply. There was a risk that a power supply shortage would occur, leading to a power outage (total power outage). In order to avoid such a situation, it is necessary to set a schedule pattern in which transformers are always turned on extra times. The drawback is that the excitation loss of the device is consumed excessively, and it does not lead to energy savings. In order to solve this drawback, as shown in Japanese Patent Application Laid-open No. 54-164234, conventional methods have been developed to ensure that the total operating power loss of a transformer group is minimized or within the optimal range for system operation with respect to the power passing through the transformer group. A method is being considered to select the number of parallel transformers so that However, in the conventional method described above, the amount of power used to select the number of transformers is based on the apparent power, so there is a problem that the actual amount of power used cannot be grasped and the optimal selection cannot be made. Ta.

This invention was made by focusing on the above-mentioned actual situation, and in addition to constantly grasping the current power consumption and power factor, the present invention can calculate the current transmittable active power based on the power transmission capacity and power factor of the transformer. In addition, by constantly calculating the load factor for power transmission capacity (total transformer capacity) based on the current amount of power used and the current active power, we can determine which transformers and how many transformers to use to reduce electricity costs. For energy saving, it is possible to determine whether operation can be continued at the minimum number of times and to optimally control the opening and closing of the controlled switchgear.
The purpose of this invention is to provide a highly efficient operation control method for a transformer.

Hereinafter, one embodiment of the present invention will be described based on the drawings. That is, in Figure 2 A and B, 7, 8, 9
are current transformers provided on the secondary side of each transformer 1, 2, and 3, and 10, 11, and 12 are current transformers 7, 8, and 9, respectively.
13 is a power factor converter that responds to the output pulse of the current transformer 7; 14 is each of the above-mentioned integrating watthour meters 10, 1;
1 and 12 and the power factor converter 13, and outputs control signals to the switching devices 4, 5, and 6.

Next, the operation of the above embodiment will be explained.

First, pulses emitted from the integrating power meters 10, 11, 12 provided on the secondary side of each transformer 1, 2, 3 are input to the arithmetic and control unit 14. Then, the input power pulses WH ₁ , WH ₂ , WH ₃ from each integrated power meter are totaled and added, and the total power consumption WH ₀ for every 30 minutes is determined by the following equation (1). .

WH ₁ +WH ₂ +WH ₃ =WH ₀ ……………(1) On the other hand, the total power transmission capacity of each transformer 1, 2, and 3 is set as TR ₀ , and the current power factor is determined by the power factor converter 13 as above. It is input to the arithmetic and control device 14, and the arithmetic and control device 14 calculates the transformer total TR ₀ from the above power factor.
In contrast, the current transmittable active power TR ₀ ′ is given by the following formula:
It is determined by (2).

TR ₀ ×cos=TR ₀ ′ ……………(2) (cos: current power factor) Then, the arithmetic and control unit 14 calculates the difference between the total power consumption WH ₀ and the active power TR ₀ ′. The load factor α is calculated as shown in the following equation (3).

α=WH ₀ /TR ₀ ′ ……………(3) Furthermore, as shown in Figure 2 C, which TR and how many TRs should be installed to minimize the cost of electricity is calculated by calculating the load factor. - The operating curve for which the graph pattern of "the number of operating transformers" is stored in advance in the arithmetic and control unit 14, and the current load factor α mentioned earlier are automatically compared by the arithmetic and control unit 14, and the calculation is performed. Based on the results, control signals are automatically issued to the switching devices 4, 5, and 6 to be controlled.

Note that the "load factor vs. number of transformers" graph in the above example differs depending on the performance (capacity, iron loss, copper loss) of each transformer, so it is calculated in advance for each target transformer. It is also possible to store the obtained data in the arithmetic and control device, and it is also possible to store data and driving reference curves from the outside in the arithmetic and control device.

In addition, in the above embodiment, three objects are controlled.
However, any number of units may be used as long as there are multiple units, and the total power pulse is integrated every 30 minutes, but the integration time can be freely set and changed depending on the type of load. The cumulative time as the control confirmation time may be changed.Furthermore, although the above embodiment was explained as an arithmetic control device, there is no problem in using this as part of the computer control function, and the same as in the above embodiment. It has the effect of

As described above, according to the highly efficient operation control method of a transformer of the present invention, the process of calculating the load factor of power receiving and distribution equipment having a plurality of transformers, and the step of calculating the load factor calculated in advance - the number of operating transformers. The process of calculating the optimal number of operating transformers corresponding to the above load factor from the operation curve of This makes it possible to determine the number of transformers in operation and to perform optimal operation control, which is extremely effective in terms of energy conservation.

[Brief explanation of the drawing]

Fig. 1A is a pattern diagram showing the operation pattern of the conventional scheduled operation control method, Fig. 1B is a system diagram showing the conventional configuration, and Fig. 2A, B, and C all show one embodiment of the present invention. 2A is a system diagram thereof, FIG. 2B is a schematic diagram showing its operation control method, and FIG. 2C is a pattern diagram showing the relationship between the load factor and the number of operating transformers. In the figure, 1, 2, 3 are transformers, 4, 5, 6
is a switchgear, 7, 8, 9 are current transformers, 10, 11,
12 is an integrating wattmeter, 13 is a power factor converter, and 14 is an arithmetic control device. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A process of understanding the current power consumption and power factor on the secondary side of a power receiving and distribution facility having multiple transformers, and determining the current transmittable active power based on the power transmission capacity of the transformer and the power factor. The process of finding
a step of calculating a load factor of the power receiving and distribution equipment based on the amount of power used and the active power; and calculating an optimal number of transformers corresponding to the load factor from a predetermined operation curve of load factor - number of operating transformers. A highly efficient operation control method for a transformer, comprising: a step of determining the number of operating transformers.