JPS631327A - Method of controlling transformer operation - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transformer operation control method for efficiently controlling the operation of a transformer connected to a power system in a substation or the like.

[Conventional technology]

Conventionally, this type of transformer operation control method determines the transformer capacity and the number of operating transformers so that the operating state of the transformer is close to the optimum at the predicted average load factor. When the constantly monitored tidal flow exceeds a predetermined target value, the transformer circuit breaker is operated so that the transformer capacity and number of transformers are operated according to the tidal flow. As a result, the number of transformers in operation is being increased or decreased.

Figure 3 is a power system diagram explaining the conventional efficiency operation control method of transformers. In Figure 3, 1 and 2 are transformers, 3 and 4
．． 5 is a breaker, 6 and 7 are busbars, 8.9 is a load that changes arbitrarily over time, 10 is a rear ffl source, 11.12 is a CT that detects the load current (tidal current) flowing to the transformer, 13
is a device that controls the efficient operation of transformers.

Next, the operation will be explained. When the current supplied from the back power source 10 flows into the loads 8 and 9 via the transformers 1 and 2, the current flowing into the loads 8 and 9 flows through the transformers 1 and 9 with the circuit breaker 5 turned on. The current flowing through the bus 2, that is, the gold component of the work 2, is a value obtained by dispersing the load amount of 8.9, respectively, and the voltage v1 of the bus 6 and the voltage v2 of the bus 7 are equivalent.

In this state, conventionally, the current flowing through each transformer 1, 2 is detected by the CTII, 12, and the efficiency operation control device 1
3, and the efficiency operation control device 13 operates with only one transformer if the total current value is less than the rated capacity of one transformer, and if it exceeds this, it operates with two transformers. drive. That is, the number of operating transformers is determined according to changes in load, and the circuit breakers of the corresponding transformers are controlled.

FIG. 4 is a flowchart showing the above operation, and step 4-1 is the input stage for reading the transformer power flow.

Step 4-2 is a judgment process part for determining the predetermined number of operating transformers based on the power flow taken in step 4-1, and step 4-3 is a judgment process part for determining the number of operating transformers based on the power flow taken in step 4-1. When it is determined that it is OK, the first control process section, step 4-4, which opens breaker 4 and turns on circuit breakers 3 and 5 in FIG. 3, similarly requires two transformers. This is the second control process section 2 that turns on the circuit breakers 3 and 4 and opens the circuit breaker 5 in FIG.

That is, the constantly monitored/detected tidal current I, + I is introduced into the inlet section in step 4-1, and then in step 4-2.
In the determination step of step 4-3.4-4, the most suitable form for the current state is determined. A second control process section sends out a breaker control command.

In addition, heretofore, as related to this type of transformer operation control method, Japanese Patent Publication Nos. 42-25123 and 42-251 have been published.
No. 24, JP-A-59-95517, JP-A No. 59-9551
There are No. 8 and so on.

[Problem that the invention seeks to solve]

The conventional transformer operation control method consists of the above steps, and is a follow-up control that operates in response to system changes. Also, if the power flow repeatedly changes near the limit value of the number of operating transformers, There were problems such as the circuit breaker being opened and closed frequently.

This invention was made to solve the above-mentioned problems, and it is possible to determine the number of operating transformers in advance in response to expected load fluctuations, and to frequently control circuit breakers. The purpose of the present invention is to obtain a transformer operation control method that enables effective operation of the transformer while maintaining a stable system state.

[Means for solving problems]

A transformer operation control method according to the present invention stores the previous day's load results, determines the current day's operation pattern based on the previous day's load results, and controls the number of operating transformers based on this. It is.

[Effect]

The transformer operation control method in this invention determines the current day's operation pattern from the previous day's load performance, which does not change significantly from the current day, and controls the number of operating transformers based on this, almost simultaneously with changes in load. The transformer can be controlled to an appropriate operating state, and frequent operation of the circuit breaker can be prevented.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the flowchart shown in FIG. In Figure 1, Step 1-1 is the input process that reads the load results from the previous day's system operation, and Step 1-2 is the monitoring process that reads the load flow of the transformer and monitors the total load on the transformer. In the step 1-3, the current load flow obtained in the monitoring process determines whether there is a problem with the previous day's load result input in the input process and predicts the load for the current day. The 8111 process section, step 1-4, is a control process section that operates a breaker to bring the system state into accordance with the prediction result of the prediction process section.

The transformer power flow changes due to load fluctuations, but as shown in Figure 2, the change pattern of the previous day's actual load M (dotted line 100) and the current day's load fluctuation (actual M110) is almost the same for the same time section. It can be said that they are equivalent. That is, it is thought that the load fluctuations on day -1 follow the same change pattern as the load fluctuations of the previous day, and based on this, the load fluctuations on that day are predicted and the system configuration is configured accordingly.

In other words, the prediction process unit in step 1-3 determines and confirms whether or not the load flow monitored by the monitoring process unit in step 1-2 has a problem based on the previous day's load results obtained in step 1-1. If there is no problem, the transformer operation at the time of determination is continued, and if there is a problem, the control process section in step 1-4 sends an operation signal to the corresponding breaker to appropriately control the number of operating transformers.

In addition, in the above embodiment, the case of efficient operation of the transformer was explained, but it is also possible to control the transformer tap based on the previous day's bus voltage change record for transformer secondary bus IIA voltage control, or to control the transformer's Even when a phase modifier connected to a transformer system is connected to or separated from the system based on reactive power performance, the same effects as in the above embodiment can be achieved.

〔Effect of the invention〕

As described above, according to the present invention, proactive control is performed in response to load fluctuations based on the previous day's load results, making it possible to operate the grid efficiently and economically, and to avoid conventional predictions. This has the effect of eliminating the need for troublesome settling operations during scheduled operation6.

[Brief explanation of the drawing]

Fig. 1 is a flowchart explaining a transformer operation control method according to an embodiment of the present invention, Fig. 2 is a diagram of a load change pattern over time, Fig. 3 is a power system diagram, and Fig. 4 is a conventional transformer. FIG. 2 is a flowchart illustrating an efficient operation control method. 1.2 is a transformer, step 1-2 is a monitoring process section, step 1-3 is a prediction process section, and step 1-4 is a control process section. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Figure 2 12: Transformer

Claims (3)

[Claims] (1) A monitoring process that monitors the total load on transformers connected to the power system, and a prediction of the current load by determining whether the total load monitored in the monitoring process has a problem with the previous day's load performance. and a control step to control the number of operating transformers so that the operating efficiency of the transformers is optimized at each time of the day according to the load prediction predicted in the prediction step. device operation control method. (2) The monitoring process monitors the secondary bus voltage of the transformer, and the prediction process predicts the current day's voltage based on the previous day's voltage results.
Claim 1, wherein the control step controls an on-load tap changer of a transformer in accordance with the voltage prediction.
Transformer operation control method described in Section 1. (3) The monitoring process monitors the reactive power passing through the transformer, the prediction process predicts the current day's reactive power based on the previous day's reactive power performance, and the control process installs phase adjustment equipment in the transformer system according to the reactive power prediction. 2. The transformer operation control method according to claim 1, wherein the transformer operation control method is characterized in that: