JP2011200003A - Device for control of transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transformer control device that operates to level the burden of reactive power and the number of operations of a tap switch when a transformer is loaded in a plurality of generator facilities.SOLUTION: The transformer control device 20 includes an information memory 17 for storing information about tap positions of other transformers 12 connected to a control target region 1a of a power system 1. If a system voltage of the control target region 1a is not less than a permissible deviation for a target voltage and the tap position of its own transformer 12 is higher than the tap position of another transformer 12, a tap controller 16 outputs a switch drive signal in a direction for lowering the tap position of the transformer 12 with respect to the loaded tap switch mechanism of its own device. If the system voltage of the control target region 1a is equal to or less than the permissible deviation for the target voltage and the tap position of its own transformer 12 is lower than the tap position of another transformer 12, the tap controller outputs a switch drive signal in a direction for making the tap position of the transformer 12 higher with respect to the loaded tap switch mechanism of its own device.

Description

  The present invention relates to a transformer control device provided for a transformer, and particularly in a power generation facility in which a generator is connected to a power system via a transformer having a load tap switching mechanism. Tap detection that can output the switching drive signal for the tap position of the on-load tap switching mechanism to the on-load tap switching mechanism, and the voltage detection means for detecting the system voltage of the specific control target area to which the generator is connected And a transformer control device.

  The generator is connected to the power system through a transformer having a load tap switching mechanism, and the tap position of the load tap switching mechanism is switched (that is, by changing the system voltage of the transformer). There is a power generation facility that attempts to increase or decrease the system voltage of the power system. In such a power generation facility, the tap position of the on-load tap switching mechanism is automatically switched by the transformer control device. And when the specific area | region of the electric power system to which the generator is connected is made into a control object area | region, it becomes a role of a transformer control apparatus to maintain the system voltage of the control object area | region to a target voltage. For example, the system voltage of the control target region can be increased by switching the tap position of the on-load tap switching mechanism to increase the system voltage of the transformer. Or the system voltage of a control object area | region can be reduced by reducing the system side voltage of a transformer.

  In such a power generation facility, the system voltage in the control target region of the power system is detected by voltage detection means as shown in FIG. The voltage detection means 13 shown in FIG. 1 has a voltage detection transformer 14 and a converter 15. The voltage detection transformer 14 is connected to the power system 1 in the control target region 1 a and generates a system voltage (or a voltage corresponding to the system voltage) at the connection portion in an internal circuit of the converter 15. The converter 15 converts the voltage value generated in its own internal circuit by the voltage detection transformer 14 into the system voltage value of the control target area 1a, and tap-controls the system voltage value of the control target area 1a. Output to means 16. When the system voltage in the control target region 1a detected by the voltage detection unit 13 is equal to or larger than the allowable deviation with respect to the target voltage, the tap control unit 16 is connected to the system side voltage of the own transformer 12 with respect to the on-load tap switching mechanism. Outputs a drive signal for switching the tap position in the direction of lowering. Alternatively, when the system voltage detected by the voltage detection unit 13 is less than the allowable deviation with respect to the target voltage, the tap control unit 16 increases the system side voltage of the transformer 12 with respect to the load tap switching mechanism. A tap position switching drive signal is output.

  Patent Document 1 describes a system in which a plurality of power generation facilities are connected to an electric power system. Each power generation facility includes a power generator, a transformer having a load tap switching mechanism, and a transformer control device. The transformer control device has voltage detection means and tap control means. In the invention described in Patent Document 1, when a certain power generation facility is started and newly connected to the power system, if there is a power generation facility previously connected to the power system, the power system is connected to the power system first. Control is performed to match the tap position of the on-load tap switching mechanism of the power generation equipment to be connected later with the tap position of the on-load tap switching mechanism of a certain power generation equipment.

Japanese Patent Laid-Open No. 7-194209

  When multiple power generation facilities (generator, transformer having a load tap switching mechanism, transformer control device) with the same configuration are connected to the control target area of the power system, the transformer provided in each power generation facility If the voltage detection means of the control device has the same device configuration, the system voltage values output simultaneously from the voltage detection means to the tap control means should be the same value. However, due to the detection error of the voltage detection transformer and the conversion error of the converter that the voltage detection means has, the system voltage value of the control target area output to the tap control means differs among the plurality of voltage detection means. May be a value. For example, when the voltage detection means of one power generation facility tends to output a lower value as the system voltage in the control target area than the voltage detection means of the other power generation equipment, the system voltage detected by the one voltage detection means The tap control means that receives the transmission of the value makes the determination that the deviation is below the allowable deviation with respect to the target voltage (that is, the determination that the tap position should be switched in the direction of increasing the system side voltage of its own transformer). There is a possibility of lowering the frequency more frequently than the tap control means. As a result, the tap position of the on-load tap switching mechanism of one power generation facility may be always higher, and further, the difference in tap positions among the plurality of power generation devices may gradually increase.

  If the tap position of the on-load tap switching mechanism is different, the amount of reactive power output from the generator will inevitably differ, and there is a problem that the burden on the generator will be greater if large reactive power is output. It reaches. That is, the problem of the detection error of the voltage detection transformer and the conversion error of the converter that each voltage detection means has appears as a difference in reactive power burden of each generator. In addition, the tap operation frequency between the transformers varies, and as a result, the maintenance cycle of the tap switching mechanism may be shortened only for a specific transformer.

  In addition, when a plurality of power generation facilities of one power plant are connected to the same bus and each power generation facility performs control to individually follow the target voltage by each tap operation, each tap control power generation facility is the same An operation of detecting the system voltage and maintaining the system voltage of the power system with the same target voltage is performed. As a result, when the system voltage fluctuates greatly in a short time, the tap operation of multiple transformers is performed simultaneously regardless of the detection error of the voltage detection means of the transformer controller, the conversion error of the converter, etc. Could be done. As a result, reactive power adjustment by a plurality of generators occurs almost simultaneously, so that the voltage control increment by the transformer tap becomes large, and there is a concern that the system voltage may be greatly fluctuated.

  Therefore, even if a detection error occurs in the voltage detection transformer of each voltage detection means or a conversion error occurs in the converter, the reactive power burden of the generator and the number of tap operations of each transformer are minimized. There is a need for a transformer control device that controls the tap position of the on-load tap switching mechanism so that it is leveled and that does not operate the taps of each transformer simultaneously when there are a plurality of power generation facilities.

  The control content described in Patent Document 1 is only control when a power generation facility is newly operated, and is not control during continuous operation of a plurality of power generation facilities. That is, in Patent Document 1, in a situation where a plurality of power generation facilities are connected to the power system at the same time and the tap position of the on-load tap switching mechanism is constantly switched, It is not described what kind of tap position switching control is performed. Therefore, even in the system described in Patent Document 1, when a detection error or the like occurs in the voltage detection unit, as described above, the tap positions of the plurality of on-load tap switching mechanisms may gradually deviate. In addition, since the tap position between transformers is prioritized over system voltage control, there is a possibility that the difference between the system side voltage and the maintenance target value of the system side voltage will be larger during the control. There is.

  The present invention has been made in view of the above problems, and its purpose is to operate so as to equalize the reactive power burden of a plurality of generators, the number of tap operations of each transformer, and the tap operation timing. The point is to provide a transformer control device.

In order to achieve the above object, a characteristic configuration of a transformer control device according to the present invention is a power generation facility in which a generator is connected to a power system via a transformer having a load tap switching mechanism. The voltage detection means for detecting the system voltage of the specific control target region to which the generator is connected, and the tap drive switching signal for the on-load tap switching mechanism can be output to the on-load tap switching mechanism A tap control means, and a transformer control device provided corresponding to the transformer,
Others provided corresponding to the other transformer when another generator is connected to the control target region of the power system via another transformer having a load tap switching mechanism Comprising information storage means for storing information on the tap position of the other transformer communicated with the transformer control device of the other transformer via an information communication line;
The tap control means includes
The other voltage transformer in which the system voltage of the control target area detected by the voltage detection means is greater than or equal to an allowable deviation with respect to a target voltage, and the tap position of the transformer is stored in the information storage means. When higher than the tap position of the transformer, a switching drive signal in a direction to lower the tap position of the transformer is output to the on-load tap switching mechanism of the transformer.
The other voltage transformer in which the system voltage in the control target area detected by the voltage detection means is equal to or less than an allowable deviation with respect to a target voltage, and the tap position of the transformer itself is stored in the information storage means. When the voltage is lower than the tap position of the transformer, the switching drive signal is output in the direction of raising the tap position of the transformer.

  According to the above characteristic configuration, the tap control means is configured such that in a scene where the system voltage is greater than or equal to the allowable deviation with respect to the target voltage (that is, a scene where the system voltage needs to be lowered to approach the target voltage), When the tap position of its own transformer is higher than the tap positions of other transformers stored in the information storage means, the tap position in the direction of lowering the system voltage of its transformer with respect to the load tap switching mechanism The switching drive signal is output. In other words, the tap control means is connected to the other transformer when the reactive power burden of the generator connected to its own transformer, which is the control target, is connected in a scene where contribution to lower the system voltage is required. When the reactive power burden of the generator is larger, a tap position switching drive signal is output to the on-load tap switching mechanism so as to lower the tap position of its own transformer.

  In addition, the tap control means has its own transformer in a scene where the system voltage is less than an allowable deviation with respect to the target voltage (that is, a scene where the system voltage needs to be raised to approach the target voltage). When the tap position of the transformer is lower than the tap positions of other transformers stored in the information storage means, the tap position switching drive signal in the direction of increasing the system voltage of the own transformer with respect to the on-load tap switching mechanism Is output. In other words, the tap control means is connected to other transformers when the reactive power burden of the generator connected to its own transformer to be controlled is connected to the other transformer in a scene where contribution for raising the system voltage is required. When the load is less than the reactive power load of the generator, the tap position switching drive signal is output to the on-load tap switching mechanism so as to raise the tap position of its own transformer.

As described above, according to this characteristic configuration, the tap positions of the transformers connecting the generators to the power system are brought closer to each other by the tap position switching control by the tap control means, or Even if the voltage on the grid side of the instrument is deviated, it will be kept to a minimum. Moreover, the tap operation of each transformer is not performed simultaneously.
Therefore, the reactive power burden of a plurality of generators, that is, the transformer control device that operates to level the contribution degree, the number of tap operations, and the tap operation timing for maintaining the system voltage of the power system near the target voltage Can provide.

Another characteristic configuration of the transformer control device according to the present invention is:
The tap control means includes
The other voltage transformer in which the system voltage of the control target area detected by the voltage detection means is greater than or equal to an allowable deviation with respect to a target voltage, and the tap position of the own transformer is stored in the information storage means. Instructing the other transformer controller to lower the tap position of the other transformer via the information communication line when lower than the tap position of the transformer; and
The other voltage transformer in which the system voltage of the control target area detected by the voltage detection means is equal to or less than an allowable deviation with respect to a target voltage, and the tap position of the own transformer is stored in the information storage means. When it is higher than the tap position of the transformer, the other transformer control device is instructed to raise the tap position of the other transformer via the information communication line.

  According to the above characteristic configuration, the tap control means is configured such that in a scene where the system voltage is greater than or equal to the allowable deviation with respect to the target voltage (that is, a scene where the system voltage needs to be lowered to approach the target voltage), When the tap position of the own transformer is lower than the tap position of the other transformer stored in the information storage means, the information communication line so that the tap position of the other transformer is lowered with respect to the other transformer control device. Direct through. In other words, the tap control means is connected to its own transformer, which is the object of control, in the reactive power burden of the generator connected to the other transformer in a scene where contribution for reducing the system voltage is required. When the reactive power burden of the generator is greater than the other transformer control device, the other transformer control device is instructed to lower the tap position of the other transformer via the information communication line.

  In addition, the tap control means has its own transformer in a scene where the system voltage is less than an allowable deviation with respect to the target voltage (that is, a scene where the system voltage needs to be raised to approach the target voltage). When the tap position of the other transformer is higher than the tap position of the other transformer stored in the information storage means, the other transformer controller is instructed via the information communication line to raise the tap position of the other transformer. To do. In other words, in a scene where contribution for increasing the system voltage is required, the tap control means generates power connected to other transformers when the contribution degree for increasing the system voltage by itself is higher than others. When the reactive power burden of the generator is smaller than the reactive power burden of the generator connected to the own transformer to be controlled, the tap position of the other transformer is raised with respect to the other transformer control device. Through the information communication line.

  As described above, according to this characteristic configuration, the tap positions of the transformers connecting the generators to the power system are brought closer to each other by the tap position switching control by the tap control means, or Even if the voltage on the grid side of the instrument is deviated, it will be kept to a minimum. Moreover, the tap operation of each transformer is not performed simultaneously.

Yet another characteristic configuration of the transformer control device according to the present invention is:
The information storage means, when it is necessary to raise the tap position of any transformer in a scene where the tap position of the own transformer and the tap position of the other transformer are the same, Priority information on the direction in which the tap position of the load tap switching mechanism is preferentially switched so as to raise the tap position of the transformer, the tap position of the own transformer, and the tap of the other transformer When it is necessary to lower the tap position of any transformer in a scene where the position is the same, give priority to the tap position of the on-load tap switching mechanism so as to lower the tap position of any transformer. Memorize the lowering direction priority information specified whether to switch,
The tap control means includes
When the system voltage of the control target area detected by the voltage detection means is equal to or greater than the allowable deviation with respect to the target voltage, and the tap position of the own transformer is the same as the tap position of the other transformer Deciding which transformer tap position to lower based on the lowering direction priority information stored in the information storage means, and determining to lower the tap position of the own transformer Output a switching drive signal in a direction to lower the tap position of the transformer of the self to the load tap switching mechanism of the self, and
When the system voltage of the control target area detected by the voltage detection means is equal to or less than an allowable deviation with respect to a target voltage, and the tap position of the own transformer is the same as the tap position of the other transformer Deciding which transformer tap position to raise based on the raising direction priority information stored in the information storage means, and determining to raise the tap position of the own transformer It is in the point which outputs the switching drive signal to the direction which raises the tap position of the self transformer with respect to the self tap change mechanism at the time of self.

  According to the above characteristic configuration, the tap control means needs to raise or lower the tap position of any transformer in a scene where the tap position of its own transformer and the tap position of another transformer are the same. When it becomes, it determines which tap position of the self or another on-load tap switching mechanism to switch based on the up direction priority order information and the down direction priority order information defined in advance. And, by outputting a switching drive signal in the direction of raising or lowering the tap position of its own transformer to its own load tap switching mechanism, the reactive power burden of the generator connected to each transformer is different. Even if this occurs, the difference intentionally occurs under the control of the transformer control device (that is, based on the upward direction priority information and the downward direction priority information). As a result, even when a difference occurs in the tap position of each transformer and the reactive power burden of the generator connected to each transformer is different, the difference in the burden can be managed.

Yet another characteristic configuration of the transformer control device according to the present invention is:
The information storage means, when it is necessary to raise the tap position of any transformer in a scene where the tap position of the own transformer and the tap position of the other transformer are the same, Priority information on the direction in which the tap position of the load tap switching mechanism is preferentially switched so as to raise the tap position of the transformer, the tap position of the own transformer, and the tap of the other transformer When it is necessary to lower the tap position of any transformer in a scene where the position is the same, give priority to the tap position of the on-load tap switching mechanism so as to lower the tap position of any transformer. Memorize the lowering direction priority information specified whether to switch,
The tap control means includes
When the system voltage of the control target area detected by the voltage detection means is equal to or greater than the allowable deviation with respect to the target voltage, and the tap position of the own transformer is the same as the tap position of the other transformer Deciding which transformer tap position to lower based on the lowering direction priority information stored in the information storage means, and determining to lower the tap position of the other transformer Instructing the other transformer control device to lower the tap position of the other transformer via the information communication line; and
When the system voltage of the control target area detected by the voltage detection means is equal to or less than an allowable deviation with respect to a target voltage, and the tap position of the own transformer is the same as the tap position of the other transformer Deciding which transformer tap position to raise based on the raising direction priority order information stored in the information storage means, and deciding to raise the tap position of the other transformer The point is to instruct the other transformer control device via the information communication line to raise the tap position of the other transformer.

  According to the above characteristic configuration, the tap control means needs to raise or lower the tap position of any transformer in a scene where the tap position of its own transformer and the tap position of another transformer are the same. When it becomes, it determines which tap position of the self or another on-load tap switching mechanism to switch based on the up direction priority order information and the down direction priority order information defined in advance. And by instructing other transformer control devices to raise or lower the tap position of other transformers via the information communication line, the reactive power burden of the generator connected to each transformer is different. Even if this occurs, the difference intentionally occurs under the control of the transformer control device (that is, based on the upward direction priority information and the downward direction priority information). As a result, even if a difference occurs in the tap position of each transformer and the reactive power burden of the generator connected to each transformer is different, the difference in the load can be managed.

Yet another characteristic configuration of the transformer control device according to the present invention is:
The tap control means includes
When instructed by the other transformer control device via the information communication line to raise the tap position of the own transformer, the transformer of the own transformer with respect to the on-load tap switching mechanism. Outputs a switching drive signal in the direction to raise the tap position,
When instructed by the other transformer control device via the information communication line to lower the tap position of the own transformer, the transformer of the own transformer with respect to the on-load tap switching mechanism. The point is to output a switching drive signal in a direction to lower the tap position.

  According to the above characteristic configuration, the tap control means controls the tap position of its own transformer by performing the switching control of the tap position of its own on-load tap switching mechanism in accordance with an instruction from another transformer control device. It can be set to an appropriate position in relation to the tap position of another transformer.

It is a figure which shows the structure of a transformer control apparatus. It is a flowchart of the tap switching control which the tap control means of a transformer control apparatus performs. It is a graph which shows transition of the system voltage of an electric power system, and the output power of a generator. It is a graph which shows transition of the tap position of a tap change mechanism at the time of load. It is a graph which shows transition of the reactive power of a generator. It is a flowchart of another tap switching control which the tap control means of a transformer control apparatus performs.

A transformer control device according to the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram illustrating a configuration of a transformer control device. In the present embodiment, two power generation facilities 10 (10A, 10B) are connected to the power system 1. Each of the power generation facilities 10A and 10B has the same configuration. Below, the structure of the electric power generation equipment 10 is demonstrated.

  As shown in FIG. 1, when the power generation facility 10 is connected to the power system 1, maintaining the voltage (system voltage) of the power system 1 to which the power generation facility 10 is connected at the target voltage Sometimes required. For example, when a specific region of the power system 1 to which the power generation facility 10 is connected is set as the control target region 1a, the power generation facility 10 is required to maintain the system voltage of the control target region 1a at the target voltage. Therefore, in this embodiment, the power generation equipment 10 (10A, 10B) includes a generator 11 (11A, 11B), a transformer 12 (12A, 12B), and a transformer control device 20 (20A, 20B).

  The generator 11 is connected to the electric power system 1 via a transformer 12 having a load tap switching mechanism. When the tap position of the on-load tap switching mechanism is switched, the system side voltage of the transformer 12 changes, and accordingly, the system of the specific control target region 1a to which the generator 11 is connected in the power system 1 is connected. The voltage changes.

  The transformer control device 20 (20A, 20B) includes a voltage detection unit 13 (13A, 13B), a tap control unit 16 (16A, 16B), and a storage unit (information storage) capable of storing information handled by the tap control unit 16. An example of means) 17 (17A, 17B) is provided. The voltage detection means 13 is provided so as to detect a system voltage of a specific control target region 1a to which the generator 11 is connected in the power system 1. In the present embodiment, the two power generation facilities 10 </ b> A and 10 </ b> B are connected to the same control target region 1 a in the power system 1. Therefore, the system voltage values detected by the voltage detection means 13A and 13B included in the power generation facilities 10A and 10B are the same. The voltage detection means 13 (13A, 13B) includes a voltage detection transformer 14 (14A, 14B) and a converter 15 (15A, 15B). The voltage detection transformer 14 is connected to the electric power system 1 in the control target area 1a, and causes the internal circuit of the converter 15 to generate the system voltage (or voltage corresponding to the system voltage) at the connection portion. The converter 15 converts the voltage value generated in its own internal circuit by the voltage detection transformer 14 into a system voltage value in the control target area 1 a and outputs the system voltage value to the tap control means 16.

  The tap control means 16 can output a tap position switching drive signal to the transformer 12 (load tap switching mechanism). In the present embodiment, the on-load tap switching mechanism is configured to be able to switch the tap position in 17 stages. Table 1 is a table illustrating the relationship between the tap position and the tap voltage of the transformer 12. In the present embodiment, the transformer 12A and the transformer 12B have the same configuration.

FIG. 2 is a flowchart of tap switching control performed by the tap control means of each transformer control device.
In step # 10, the tap control means 16 of the transformer control device 20 determines whether or not the system voltage in the control target region 1a detected by the voltage detection means 13 is greater than or equal to the allowable deviation with respect to the target voltage. For example, the target voltage is V [kV] and the allowable deviation is ± α [kV]. If the system voltage in the control target region 1a is greater than or equal to the allowable deviation with respect to the target voltage (“Yes” in step # 10), it is necessary to lower the system voltage. For example, the tap position of the transformer 12 needs to be lowered. However, in this embodiment, the tap control means 16 does not immediately lower the tap position of its own transformer 12, but the tap position of the other transformer 12 controlled by the other transformer control device 20. Is compared to determine whether or not the tap position of its own transformer 12 should be lowered.

Specifically, in step # 12, the tap control means 16 determines whether or not the tap position of its own transformer 12 is larger than the tap positions of the other transformers 12. In the present embodiment, the transformer control device 20 is connected to the other transformer control device 20 via the information communication line 2 so as to be capable of information communication, and the tap control means 16 is connected to the other transformer control device 20. The transmission of the tap position of the on-load tap switching mechanism of the transformer 12 to be controlled is sequentially received and stored in the storage unit 17. Alternatively, when the tap control means 16 executes the step # 12, the tap position of the on-load tap switching mechanism of the transformer 12 that is controlled by the transformer control device 20 with respect to the other transformer control device 20 Is requested via the information communication line 2 and received.
The tap control means 16 proceeds to Step # 14 when the tap position of its own on-load tap switching mechanism is larger than the tap position of the other on-load tap switching mechanism, and the tap position of its own on-load tap switching mechanism is If it is below the tap position of another on-load tap switching mechanism, the process proceeds to step # 16.

  In step # 14, the tap control means 16 lowers the tap position of the on-load tap switching mechanism of the transformer 12 by one step. That is, in the scene where the tap control means 16 is required to contribute to lowering the system voltage, the reactive power burden of the generator connected to the transformer to be controlled is connected to another transformer. When the reactive power burden of the generator is larger, a tap position switching drive signal is output to the on-load tap switching mechanism so as to lower the system voltage of the transformer 12 of its own.

  In step # 16, the tap control means 16 determines whether or not the tap position of the on-load tap switching mechanism controlled by itself is smaller than the tap position of another on-load tap switching mechanism.

  If the tap control means 16 determines in step # 16 that the tap position of the on-load tap switching mechanism controlled by itself is not smaller than the tap position of the other on-load tap switching mechanism (as a result, the load controlled by itself). When it is determined that the tap position of the hour tap switching mechanism is the same as the tap position of another load tap switching mechanism), the process proceeds to step # 18.

In step # 18, the tap control means 16 determines whether or not the priority of the tap position switching of the self-load tap switching mechanism when the system voltage of the power system 1 is lowered is higher than the others. That is, in step # 18, in order to lower the system voltage of the electric power system 1, it is necessary to switch the direction of lowering the tap position of any of the on-load tap switching mechanisms. Is the same as the tap position of the other load tap switching mechanism. In the present embodiment, in the storage unit 17 of the transformer control device 20, the tap position of the on-load tap switching mechanism controlled by itself is the same as the tap position of the other on-load tap switching mechanism, and either When it is necessary to switch the tap position of the on-load tap switching mechanism in the lowering direction, “lowering direction priority order information” that defines which tap position of the on-load tap switching mechanism is to be switched with priority is stored. Therefore, in step # 18, the tap control means 16 reads out and refers to the “down direction priority information” stored in the storage unit 17, and determines the tap position switching priority of the own load tap switching mechanism. If it is higher, the process proceeds to step # 14 to switch the tap position of the self-loading tap switching mechanism to the lowering direction, and when the priority of the tap position switching of the self-loading tap switching mechanism is lower than the others, the tap operation is performed. Do not do, keep current tap position.
The tap control means 16 returns to process # 10 after performing process # 14.

  In step # 22, the tap control means 16 of the transformer control device 20 determines whether or not the system voltage in the control target area 1a detected by the voltage detection means 13 is equal to or less than the allowable deviation with respect to the target voltage. If the system voltage in the control target area 1a is equal to or smaller than the allowable deviation with respect to the target voltage (“Yes” in step # 22), the power generation facility 10 needs to operate so as to increase the system voltage. Specifically, it is necessary to raise the tap position of the transformer 12. However, as described above, the tap control means 16 does not immediately raise the tap position of its own transformer 12, but taps of other transformers 12 controlled by other transformer control devices 20. A comparison with the position is made to determine whether or not the tap position of its own transformer 12 should be lowered.

  Specifically, in step # 24, the tap control means 16 determines whether or not the tap position of its own transformer 12 is smaller than the tap positions of the other transformers 12. When the tap position of its own on-load tap switching mechanism is smaller than the tap position of the other on-load tap switching mechanism, the tap control means 16 proceeds to step # 26, and the tap position of its own on-load tap switching mechanism is If it is equal to or greater than the tap position of another on-load tap switching mechanism, the process proceeds to step # 28.

  In step # 26, the tap control means 16 raises the tap position of the on-load tap switching mechanism by one step. That is, the tap control means 16 is connected to other transformers in the reactive power burden of the generator connected to the transformer to be controlled in a scene where contribution for increasing the system voltage is required. When the reactive power burden of the generator is smaller, a tap position switching drive signal is output to the on-load tap switching mechanism so as to raise the tap position of its own transformer 12.

  In step # 28, the tap control means 16 determines whether or not the tap position of the on-load tap switching mechanism controlled by itself is larger than the tap positions of other on-load tap switching mechanisms.

  In step # 28, the tap control means 16 determines that the tap position of the on-load tap switching mechanism controlled by itself is not larger than the tap position of the other on-load tap switching mechanism (as a result, the load controlled by itself). When it is determined that the tap position of the hour tap switching mechanism is the same as the tap position of another load tap switching mechanism), the process proceeds to step # 30.

In step # 30, the tap control means 16 determines whether or not the tap position switching priority of its own on-load tap switching mechanism when raising the system voltage of the power system 1 is higher than the others. That is, in step # 30, in order to increase the system voltage of the power system 1, it is necessary to switch the direction of increasing the tap position of any of the on-load tap switching mechanisms. Is the same as the tap position of the other load tap switching mechanism. In the present embodiment, in the storage unit 17 of the transformer control device 20, the tap position of the on-load tap switching mechanism controlled by itself is the same as the tap position of the other on-load tap switching mechanism, and either “Upward direction priority information” that defines which load tap switching mechanism is preferentially switched when the tap position of the on-load tap switching mechanism needs to be switched is stored. Accordingly, in step # 30, the tap control means 16 reads and refers to the “upward direction priority order information” stored in the storage unit 17, and determines the priority of the tap position switching of its own on-load tap switching mechanism. If it is higher, the process proceeds to step # 26 to switch the tap position of the self-loading tap switching mechanism to a higher direction, and when the priority of the tap position switching of the self-loading tap switching mechanism is lower than the others, the tap operation is performed. Do not do, keep current tap position.
The tap control means 16 returns to process # 10 after performing process # 26.

  As described above, in the transformer control device 20 according to the present invention, the tap positions of the transformers 12 connecting the generators 11 to the power system 1 are mutually controlled by the tap position switching control by the tap control means 16. It can be made to be kept to a minimum or even if the system side voltage of each transformer 12 is deviated. Further, the tap operations of the transformers 12 can be prevented from being performed simultaneously. Accordingly, the reactive power burden of the plurality of generators 11, that is, a transformer that operates to level the contribution degree for maintaining the system voltage of the power system 1 near the target voltage, the number of tap operations, and the tap operation timing. The control device 20 can be provided.

  Below, with reference to FIGS. 3-5, the example at the time of actually performing tap switching control mentioned above is demonstrated. 3 to 5 show an example in which one generator 11 is already in operation and the other generator 11 is newly arranged in parallel. FIG. 3 is a graph showing the transition of the system voltage of the power system and the active power of each of the generators 11A and 11B. FIG. 4 is a graph showing the transition of the tap position of each on-load tap switching mechanism. FIG. 5 is a graph showing the transition of reactive power of each of the generators 11A and 11B.

Prior to time t1, only the power generation facility 10A is operating. At this time, the tap position of the on-load tap switching mechanism of the power generation facility 10A is the 11th stage. The target voltage of the electric power system 1 is 276 kV, and the allowable deviation is ± 2 kV.
When the power generation facility 10B is paralleled at time t1, the output active power of the generator 11B of the power generation facility 10B gradually increases. At time t1, the system voltage of the power system 1 is about 272 kV, and the period during which the allowable deviation (± 2 kV) is smaller than the target voltage (276 kV) continues for a set period (70 seconds in this example) or longer. is doing. At time t1, the tap position of the on-load tap switching mechanism of the power generation facility 10A is the 11th stage, and the tap position of the on-load tap switching mechanism of the power generation apparatus 10B is the 10th stage. Therefore, the tap control means 16B of the transformer control device 20B of the power generation facility 10B switches the tap position so as to increase the system side voltage of its own transformer 12B (step # 26 in FIG. 2). Also in the example shown in FIG. 4, as a result, at time t1, the tap control means 16B of the transformer control device 20B of the power generation facility 10B switches the tap position of the on-load tap switching mechanism from the 10th stage to the 11th stage.

  Furthermore, between the time t1 and the time t2, following the above situation, the period during which the system voltage of the power system 1 is smaller than the allowable deviation (± 2 kV) with respect to the target voltage (276 kV) is a set period ( 70 seconds) or more. Therefore, it is necessary to increase the grid voltage of the power system 1 by raising the tap position of the on-load tap switching mechanism of the power generation facility 10A or the tap position of the on-load tap switching mechanism of the power generation facility 10B by one step. ing. In the present embodiment, when the system voltage of the power system 1 is to be increased, “upward direction priority information” that preferentially increases the tap position of the on-load tap switching mechanism of the transformer 12B of the power generation facility 10B. It is stored in each storage unit 17A, 17B. As a result, at time t2, the tap position of the on-load tap switching mechanism of the transformer 12B of the power generation facility 10B is increased by one stage to the 12th stage.

  Between time t2 and time t3, the tap position of the on-load tap switching mechanism of the power generation equipment 10A is the 11th stage, and the tap position of the on-load tap switching mechanism of the power generation equipment 10B remains at the 12th stage. Thus, the operation of the power generation facility 10A and the power generation facility 10B is continued. At this time, since the tap position of the on-load tap switching mechanism of the power generation facility 10B has a higher number of stages than the tap position of the on-load tap switching mechanism of the power generation facility 10A, as shown in FIG. The reactive power output by the generator 11B of 10B is larger than the reactive power output by the generator 11A of the power generation facility 10A. That is, the generator 11B of the power generation facility 10B is operating with a higher reactive power burden than the generator 11A of the power generation facility 10A.

  During the set period (70 seconds) immediately before time t3, the state where the system voltage of the power system 1 is smaller than the allowable deviation (± 2 kV) with respect to the target voltage (276 kV) continues. At time t3, the tap position of the on-load tap switching mechanism of the power generation facility 10A is the 11th stage, and the tap position of the on-load tap switching mechanism of the power generation apparatus 10B is the 12th stage. Therefore, the tap control means 16A of 20A of the power generation facility 10A switches the tap position so as to increase the system side voltage of its own transformer 12A (step # 26 in FIG. 2). Also in the example shown in FIG. 4, as a result, the tap control means 16A of the transformer control device 20A of the power generation facility 10A switches the tap position of the on-load tap switching mechanism from the 11th stage to the 12th stage at time t3.

  At time t3, the tap control means 16A of the transformer control device 20A of the power generation equipment 10A switches the tap position of the on-load tap switching mechanism from the 11th stage to the 12th stage, so that the generator 11A of the power generation equipment 10A outputs The reactive power to be increased is approximately the same as the reactive power output from the generator 11B of the power generation facility 10B. In other words, the generator 11A of the power generation facility 10A and the generator 11B of the power generation facility 10B are operating under almost the same reactive power burden state.

  As described above, by leveling the tap positions of the on-load tap switching mechanisms of the plurality of power generation facilities 10A and 10B, the burden (reactive power) on the power system 1 between the plurality of power generation facilities 10A and 10B is reduced. Leveling is possible.

<Another embodiment>
<1>
In the above embodiment, the up direction priority information and the down direction priority information may be information that is changed as needed or information that is not changed.
For example, in the upward direction priority information and the downward direction priority information, the switching of the tap position of the on-load tap switching mechanism of the power generation facility 10A has priority over the switching of the tap position of the on-load tap switching mechanism of the power generation facility 10B. It may be information that defines a constant relationship (or vice versa).
Alternatively, the tap control means 16A, 16B accumulates the number of tap position switching of the on-load tap switching mechanism after starting the generators 11A, 11B and stores them in the storage units 17A, 17B. The number of tap position switching performed periodically is communicated via the information communication line 2, and new up direction priority order information and lowering that give priority to the switching of the tap position of the on-load tap switching mechanism with the smaller number of switching times. Direction priority information may be defined.
Or you may prescribe | regulate which operation | movement of the tap switching mechanism has priority according to a predetermined schedule, such as according to time zone or season. Based on an optimization calculation related to the tap operation (finished value of the system-side voltage, etc.), which tap switching mechanism is prioritized may be specified.

<2>
In the above embodiment, an example in which two power generation facilities 10 (10A, 10B) are connected to the same control target region 1a has been described. However, three or more power generation facilities 10 are connected to the same control target region 1a. It may be. Even in such a case, the tap control means 16 of the transformer control device 20 provided in each power generation facility 10 has a system voltage in the control target region 1a detected by the voltage detection means 13 with respect to the target voltage. Determination of whether or not the tolerance is greater than or less than the tolerance, and whether or not the tap position of its own transformer 12 is higher, lower or the same as the tap position of the other transformer 12 stored in the storage unit 17 It is only necessary to output a tap position switching drive signal in the direction of increasing or decreasing the system-side voltage of the transformer 12.

<3>
In the above embodiment, the two power generation facilities 10 (10A, 10B) have independent tap control means, and each performs the tap switching control according to the flowchart based on FIG. 2, but as shown in FIG. Step # 20, Step # 32, Step # 34, Step # 36 are provided, and when the tap position switching order is lower than others, the information communication line is connected to the transformer control device 20 of the other transformer 12. By issuing a tap position switching command via 2, the tap switching control of a plurality of transformers 12 may be performed by a single tap control means 16.

For example, in step # 16 of FIG. 6, the tap control means 16 determines whether or not the tap position of the on-load tap switching mechanism controlled by itself is smaller than the tap position of another on-load tap switching mechanism. When the tap position of the on-load tap switching mechanism controlled by the tap control means 16 is smaller than the tap position of the other on-load tap switching mechanism (“Yes” in step # 16), the tap control means 16 proceeds to step # 20. It shifts and instructs other transformer control devices 20 to lower the tap position. That is, in a scene where contribution for reducing the system voltage is required, the tap control means 16 reduces the system voltage due to the other when the contribution degree for reducing the system voltage by itself is higher than the others. The other transformer control device 20 is instructed to lower the tap position of the other transformer 12 via the information communication line 2 so that the contribution level of the second transformer becomes higher.
In step # 18 of FIG. 6, when the tap control means 16 tries to lower the system voltage of the power system 1, it determines whether the priority of the tap position switching of its own on-load tap switching mechanism is higher than others. judge. That is, in step # 18, the tap control means 16 reads and refers to the “down direction priority order information” stored in the storage unit 17, and determines the priority of the tap position switching of its own on-load tap switching mechanism. If it is higher, the process proceeds to step # 14 to switch the tap position of the self-loading tap switching mechanism to a lowering direction, and when the priority of tap position switching of the self-loading tap switching mechanism is lower than the other, the process # 20 is performed. And the other transformer control device 20 is instructed to lower the tap position.
The tap control means 16 moves to process # 34 after performing process # 14 or process # 20.

In Step # 28 of FIG. 6, the tap control means 16 determines whether or not the tap position of the on-load tap switching mechanism controlled by itself is larger than the tap positions of other on-load tap switching mechanisms. When the tap position of the on-load tap switching mechanism controlled by the tap control means 16 is larger than the tap position of the other on-load tap switching mechanism (“Yes” in step # 28), the tap control means 16 proceeds to step # 32. Then, the other transformer control device 20 is instructed via the information communication line 2 to raise the tap position. That is, the tap control means 16 increases the system voltage by the other when the contribution degree for increasing the system voltage by itself is higher than the others in the scene where the contribution for increasing the system voltage is required. The other transformer control device 20 is instructed to raise the tap position of the other transformer 12 via the information communication line 2 so that the contribution degree of the above becomes higher.
In step # 30 of FIG. 6, when the tap control means 16 tries to increase the grid voltage of the power grid 1, it determines whether the priority of the tap position switching of its own on-load tap switching mechanism is higher than others. judge. That is, in step # 30, the tap control means 16 reads and refers to the “upward direction priority information” stored in the storage unit 17, and determines the tap position switching priority of the self-load tap switching mechanism. If it is higher, the process proceeds to step # 26 to switch the tap position of its own on-load tap switching mechanism to a higher direction, and if the priority of tap position switching of its own on-load tap switching mechanism is lower than the other, step # 32 And the other transformer control device 20 is instructed to raise the tap position.
The tap control means 16 moves to process # 34 after performing process # 26 or process # 32.

In step # 34, the tap control means 16 determines that when the other transformer control device 20 instructs to change the tap position of the on-load tap switching mechanism of the own transformer 12, the on-load tap switching mechanism. Switch the tap position according to the change instruction.
The tap control means 16 returns to process # 10, after performing tap position switching in process # 36, or when determining in step # 34 that there is no change instruction from another transformer control device 20.

<4>
In the above embodiment, the example in which the generator 11A, the transformer 12A, the generator 11B, and the transformer 12B have the same configuration has been described. However, the generator 11 and the transformer 12 having different configurations may be used. However, in that case, even if the tap positions of the on-load tap switching mechanism of each transformer 12 indicate the same number of stages, the reactive power burden of each generator 11 has a different value. Even in such a case, each tap control means 16 receives the transmission of the tap position of the transformer 12 that is controlled by the other transformer control device 20 sequentially and stores it in the storage unit 17. A comparison may be made as to whether the tap position of the own transformer 12 is higher, lower or the same as the tap position of the other transformer 12 stored in the storage unit 17.

<5>
In the above-described embodiment, the example in which the target voltage of the system voltage in the control target region 1a is 276 kV has been described, but another voltage value may be used as the target voltage. Alternatively, the target voltage may be changed according to the time zone, season, and operating conditions on the system side.

  The transformer control device of the present invention can be used to level the reactive power burden and the number of tap operations of a plurality of generators connected to the power system.

DESCRIPTION OF SYMBOLS 1 Power system 1a Control object area | region 2 Information communication line 10 (10A, 10B) Power generation equipment 11 (11A, 11B) Generator 12 (12A, 12B) Transformer 13 (13A, 13B) Voltage detection means 16 (16A, 16B) Tap control means 17 (17A, 17B) Storage section (information storage means)
20 (20A, 20B) Transformer control device

Claims (5)

In a power generation facility in which a generator is connected to a power system via a transformer having a tap switching mechanism at load, a system voltage of a specific control target region to which the generator is connected in the power system. Voltage detecting means for detecting, and tap control means capable of outputting a tap position switching drive signal of the on-load tap switching mechanism to the on-load tap switching mechanism, provided corresponding to the transformer. A transformer control device,
Others provided corresponding to the other transformer when another generator is connected to the control target region of the power system via another transformer having a load tap switching mechanism Comprising information storage means for storing information on the tap position of the other transformer communicated with the transformer control device of the other transformer via an information communication line;
The tap control means includes
The other voltage transformer in which the system voltage of the control target area detected by the voltage detection means is greater than or equal to an allowable deviation with respect to a target voltage, and the tap position of the transformer is stored in the information storage means. When higher than the tap position of the transformer, a switching drive signal in a direction to lower the tap position of the transformer is output to the on-load tap switching mechanism of the transformer.
The other voltage transformer in which the system voltage in the control target area detected by the voltage detection means is equal to or less than an allowable deviation with respect to a target voltage, and the tap position of the transformer itself is stored in the information storage means. A transformer control device that outputs a switching drive signal in a direction of raising the tap position of the transformer to the tap switching mechanism of the transformer when the load is lower than the tap position of the transformer. The tap control means includes
The other voltage transformer in which the system voltage of the control target area detected by the voltage detection means is greater than or equal to an allowable deviation with respect to a target voltage, and the tap position of the own transformer is stored in the information storage means. Instructing the other transformer controller to lower the tap position of the other transformer via the information communication line when lower than the tap position of the transformer; and
The other voltage transformer in which the system voltage of the control target area detected by the voltage detection means is equal to or less than an allowable deviation with respect to a target voltage, and the tap position of the own transformer is stored in the information storage means. 2. The transformer control device according to claim 1, wherein when it is higher than the tap position of the transformer, the other transformer control device is instructed to raise the tap position of the other transformer via the information communication line. The information storage means, when it is necessary to raise the tap position of any transformer in a scene where the tap position of the own transformer and the tap position of the other transformer are the same, Priority information on the direction in which the tap position of the load tap switching mechanism is preferentially switched so as to raise the tap position of the transformer, the tap position of the own transformer, and the tap of the other transformer When it is necessary to lower the tap position of any transformer in a scene where the position is the same, give priority to the tap position of the on-load tap switching mechanism so as to lower the tap position of any transformer. Memorize the lowering direction priority information specified whether to switch,
The tap control means includes
When the system voltage of the control target area detected by the voltage detection means is equal to or greater than the allowable deviation with respect to the target voltage, and the tap position of the own transformer is the same as the tap position of the other transformer Deciding which transformer tap position to lower based on the lowering direction priority information stored in the information storage means, and determining to lower the tap position of the own transformer Output a switching drive signal in a direction to lower the tap position of the transformer of the self to the load tap switching mechanism of the self, and
When the system voltage of the control target area detected by the voltage detection means is equal to or less than an allowable deviation with respect to a target voltage, and the tap position of the own transformer is the same as the tap position of the other transformer Deciding which transformer tap position to raise based on the raising direction priority information stored in the information storage means, and determining to raise the tap position of the own transformer The transformer control device according to claim 1 or 2, wherein a switching drive signal in a direction to raise the tap position of the transformer of its own is output to the self-loading tap switching mechanism. The information storage means, when it is necessary to raise the tap position of any transformer in a scene where the tap position of the own transformer and the tap position of the other transformer are the same, Priority information on the direction in which the tap position of the load tap switching mechanism is preferentially switched so as to raise the tap position of the transformer, the tap position of the own transformer, and the tap of the other transformer When it is necessary to lower the tap position of any transformer in a scene where the position is the same, give priority to the tap position of the on-load tap switching mechanism so as to lower the tap position of any transformer. Memorize the lowering direction priority information specified whether to switch,
The tap control means includes
When the system voltage of the control target area detected by the voltage detection means is equal to or greater than the allowable deviation with respect to the target voltage, and the tap position of the own transformer is the same as the tap position of the other transformer Deciding which transformer tap position to lower based on the lowering direction priority information stored in the information storage means, and determining to lower the tap position of the other transformer Instructing the other transformer control device to lower the tap position of the other transformer via the information communication line; and
When the system voltage of the control target area detected by the voltage detection means is equal to or less than an allowable deviation with respect to a target voltage, and the tap position of the own transformer is the same as the tap position of the other transformer Deciding which transformer tap position to raise based on the raising direction priority order information stored in the information storage means, and deciding to raise the tap position of the other transformer The transformer control device according to any one of claims 1 to 3, wherein the other transformer control device is instructed via the information communication line to raise a tap position of the other transformer. The tap control means includes
When instructed by the other transformer control device via the information communication line to raise the tap position of the own transformer, the transformer of the own transformer with respect to the on-load tap switching mechanism. Outputs a switching drive signal in the direction to raise the tap position,
When instructed by the other transformer control device via the information communication line to lower the tap position of the own transformer, the transformer of the own transformer with respect to the on-load tap switching mechanism. The transformer control device according to any one of claims 1 to 4, which outputs a switching drive signal in a direction to lower the tap position.

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