JPH10164898A - Excitation controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to continue operation by changing one defective system in a doubled automatic voltage regulator over to a stand-by system without causing an overexcitation state by automatically shifting an overexcitation limitation detection starting set value, an overexcitation limitation line, and an overexcitation retracted value, keeping the proportional relationships between these values. SOLUTION: Detectors 16A, 16B detect the operating condition and field current (field voltage) of a synchronous machine 1. Overexcitation limitation devices 14A, 14B instruct controllers 10A, 10B in automatic voltage regulators 9A, 9B to make an overexcitation limitation control of the synchronous machine 1 according to the commands from the detectors 16A, 16B by automatically shifting an overexcitation limitation detection starting set value, an overexcitation limitation line, and an overexcitation limitation retracted value, each of which has an inverse-time characteristic of overexcitation limitation of the synchronous machine 1 depending on the operating condition of the synchronous machine 1 detected by the detectors 16A, 16B, until these values exceed a calculated overexcitation detection limitation line, while keeping the proportional relationships between these values. By this method, the synchronous machine 1 can be operated smoothly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an excitation control device for a synchronous machine.

[0002]

2. Description of the Related Art A conventional excitation control device will be described with reference to FIG. In FIG. 15, reference numeral 1 denotes a synchronous machine provided with a field winding 2, and an output terminal of the synchronous machine 1 is connected to a power system 5 via a main transformer 3 and a circuit breaker 4 for system parallelism. Reference numeral 6 denotes a thyristor rectifier provided in an exciting circuit that excites the field winding 2 of the synchronous machine 1 through a field circuit breaker 7, and the AC input terminal of the thyristor rectifier is connected via an exciting power supply transformer 8 to the synchronous machine. 1 output terminal.

[0003] 9A and 9B are automatic voltage regulators having the same configuration of the former and second systems for controlling the excitation of the synchronous machine 1, and 10A is provided with an input terminal via a former fuse 11A and a former transformer 12A. The instep control device 10A is connected to the output terminal of the synchronous machine 1. The instep control device 10A controls the thyristor rectifier 6 so that the output voltage of the synchronous machine 1 becomes the voltage set by the instep voltage setting device 13A. Gate control of the thyristor.

[0004] Reference numeral 14A denotes an instep system over-excitation limiting device which receives the current of the in-system instrument current transformer 15A as an input.
When an excessive field current flows through the field winding 2 of the synchronous machine 1 for some reason, the over-excitation state is detected with a time limit characteristic. And operates to limit the value to the overexcitation limit pullback value.

The system A automatic voltage regulator 9B has the same configuration as the former system automatic voltage regulator 9A, and is composed of a system control device 10B, a system voltage setter 13B, and a system B overexcitation limiter 14B. It is connected to the output terminal of the synchronous machine 1 via an instrument transformer 12B and a second system fuse 11B. The former system and the second system share the roles of the service system and the standby system, respectively, to thereby duplicate the automatic voltage regulator.

The synchronous machine generates a field current in the field winding 2. When a certain current or more flows, the synchronous machine is overexcited, and the temperature in the field winding 2 rises remarkably. The machine 1 will be damaged.

FIG. 16 shows an overexcitation limit diagram, in which the vertical axis shows the field current _If (%) and the horizontal axis shows time t (second). In the figure, 100 is the overexcitation limit pullback value, 2
00 is an overexcitation limit detection start set value, 300 is an overexcitation limit line, 400 is a standby system switching limit line, 500 is a rated load field current value, and 600 is a no-load field voltage value.

Therefore, when the synchronous machine is operating at the rated load,
When the field current of the synchronous machine exceeds the overexcitation limit detection start set value 200 and continues for a certain period of time, an alarm signal for overexcitation detection is output to the automatic voltage regulator by a predetermined overexcitation control line 300, The field current of the synchronous machine is suppressed to an overexcitation limit pullback value of 100.

If the field current of the synchronous machine is not suppressed even after the lapse of a predetermined time, the excitation control of the synchronous machine is switched to the standby system by the standby system switching restriction line 400. In the above configuration, if an excitation system fault occurs in the fault system shown in FIG. 17 in the fault system, the fault system lockout relay operates, and the system automatically switches to the second system to continue operation. Further, if a similar excitation system failure as shown in FIG. 17 occurs in the second system in this state, the second system lockout relay does not operate, and the operation is continued with the second system.

If an excitation system failure such as a PT fuse blowout occurs while the synchronous machine is operating in a rated state, the automatic voltage regulator determines that the terminal voltage of the synchronous machine has dropped. As a result, the automatic voltage regulator outputs an over-excitation signal and enters an over-excitation state.However, as shown in FIG. 16, the field current of the synchronous machine exceeds the over-excitation limit detection start set value having the time limit characteristic. An excitation weakening signal is output to the automatic voltage regulator with a time delay corresponding to the excess. As a result, the field current of the synchronous machine is suppressed to the overexcitation limit pullback value, and the synchronous machine can be operated continuously.

[0011]

As described above, when the automatic voltage regulator is in standby mode due to a single system failure during the rated load operation due to duplexing, the excitation such as the PT fuse blown. Conventionally, even if a system failure occurs, failure detection is not performed and continuous operation is performed.

However, during the no-load operation, the automatic voltage regulator switches to the single-system operation due to the single-system failure, and if an excitation system failure such as a PT fuse blow occurs, the field current of the synchronous machine continues to increase, and the over-excitation limit occurs. Before performing the above operation, the synchronous machine is in an overexcitation state that cannot be tolerated, and the overvoltage causes damage to the synchronous machine, resulting in a stop accident, which is not preferable in operation.

The present invention has been made in view of the above circumstances. Even if one of the redundant automatic voltage regulators fails, the system is switched to the standby system without being overexcited excessively. Even if the excitation system failure occurs during the stand-by operation in the event of a single system failure, the automatic voltage regulator will not over-excit the synchronous machine An object is to provide an excitation control device that enables operation.

[0014]

According to a first aspect of the present invention, there is provided an excitation control apparatus which receives an output voltage of a synchronous machine and a field current, receives an input of the output voltage and a field current, and uses an automatic voltage regulator having a duplex configuration. In an excitation control device for performing excitation control of a synchronous machine, detection means for detecting an operating point and a field current (field voltage) of the synchronous machine, and a time limit for overexcitation limitation of the synchronous machine depending on an operation state of the detection means. The over-excitation limit detection start set value, the over-excitation limit line, and the over-excitation limit withdrawal value having characteristics are automatically shifted until the calculated over-excitation detection limit line is exceeded while maintaining a proportional relationship with each other. By doing
An overexcitation limiting device for instructing a control device of each system in the automatic voltage regulator to perform overexcitation limiting control of the synchronous machine in accordance with an instruction from the detection means.

The excitation control device according to claim 1 calculates an operating point and a field current (or a field voltage) of the synchronous machine based on an output voltage and an output current of the synchronous machine, and calculates an operating state of the synchronous machine according to an operating state of the synchronous machine. The over-excitation limit detection start setting line, over-excitation limit line, and over-excitation pull-back value, which have the time limit characteristic of the over-excitation limit of the synchronous machine, are automatically adjusted until the calculated over-excitation detection limit line is exceeded while maintaining the proportional relationship. The automatic voltage regulator is not duplicated and the standby system is not over-excited even if an excitation system failure such as a PT fuse blowout occurs due to the time shift and the continuous shift. And the operation is continued. Also, even if one system has already failed and an excitation system failure such as a PT fuse blowout occurs during the one system operation by the standby system, the automatic voltage regulator will be over-excited to the point that the synchronous machine cannot withstand. It is not possible to continue the continuous operation state.

According to a second aspect of the present invention, the excitation control device according to the first aspect detects a condition command when an excitation system failure occurs, and detects a condition command before the time when the condition command occurs. Time, the overexcitation limit detection start set value, the overexcitation limit line, and the overexcitation limit withdrawal value having the overtime limit characteristic of the overexcitation limit of the synchronous machine determined by the operation state of the synchronous machine are automatically changed. A failure detector is provided for instructing each system of the over-excitation limiter in the automatic voltage regulator to perform the over-excitation limit control.

An excitation control device according to a second aspect of the present invention is substantially the same as the first aspect of the invention, but detects a condition command when an excitation system failure occurs, and calculates a condition command based on the time when the condition command is generated. Also automatically changes to the over-excitation limit detection start set value, over-excitation limit line, and over-excitation pull-back value that have the time limit characteristic of the over-excitation limit of the synchronous machine determined by the operating state of the synchronous machine at the previous time, By maintaining the voltage, the automatic voltage regulator is not over-excited even if the excitation system is broken such as the PT fuse is blown out of the redundancy, and the operation is switched to the standby system and the operation is continued. Also, even if one system has already failed and an excitation system failure such as a PT fuse blowout occurs during the one system operation by the standby system, the automatic voltage regulator will be over-excited to the point that the synchronous machine cannot withstand. It is not possible to continue the continuous operation state.

According to a third aspect of the present invention, there is provided the excitation control apparatus according to the first aspect, wherein the detecting means detects a predetermined number of patterns of the overexcitation limitation of the synchronous machine depending on the operating state of the synchronous machine. With a time limit characteristic, a predetermined pattern is selected from the set value of the overexcitation limit detection start, the overexcitation limit line, and the overexcitation limit pullback value.

The excitation control device according to claim 3 calculates an operating point and a field current (or a field voltage) of the synchronous machine based on an output voltage and an output current of the synchronous machine, and calculates an operating point of the synchronous machine according to an operation state of the synchronous machine. By automatically selecting a certain pattern from a set value of overexcitation limit detection start, an overexcitation limit line, and an overexcitation pullback value having a predetermined time pattern overtime limit characteristic of overexcitation limit of the synchronous machine, In the case where the automatic voltage regulator is duplicated, an excessive overexcitation state is not caused by an excitation system failure such as a blown PT fuse, and the operation is continued by switching to a standby system. Also, even if one system has already failed and an excitation system failure such as a PT fuse blowout occurs during the one system operation by the standby system, the automatic voltage regulator will be over-excited to the point that the synchronous machine cannot withstand. It is not possible to continue the continuous operation state.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the excitation control device detects a condition command when an excitation system failure occurs, and detects the condition command before the time when the condition command is generated. The pattern of the over-excitation limit detection start set value, the over-excitation limit line, and the over-excitation limit pull-back value having the time limit characteristic of the over-excitation limit of the synchronous machine, which is selected according to the operation state of the synchronous machine, is automatically selected. A fault detector for selectively selecting and instructing the over-excitation limiting device of each system in the automatic voltage regulator.

An excitation control device according to a fourth aspect is substantially the same as the third aspect, but detects a condition command when an excitation system failure has occurred, and calculates the condition command based on the time at which the condition command occurs. The pattern of the over-excitation limit detection start setting line, over-excitation limit line, and over-excitation pull-back value that have the time limit characteristics of the over-excitation limit of the By selecting and maintaining the voltage, the automatic voltage regulator does not become excessively over-excited even if the excitation system fails such as the PT fuse is blown out of the duplex, and the operation is switched to the standby system and the operation is continued. You. Also, even if one system has already failed and an excitation system failure such as a PT fuse blowout occurs during the one system operation by the standby system, the automatic voltage regulator will be over-excited to the point that the synchronous machine cannot withstand. Without reaching
Continuous operation can be continued.

According to a fifth aspect of the present invention, there is provided an excitation control apparatus which receives an output voltage of a synchronous machine and a field current, and controls excitation of the synchronous machine by an automatic voltage regulator having a duplex configuration. When performing excitation control during operation in a dual excitation control device, the overexcitation limit control of the synchronous machine is performed by setting an overexcitation limit detection start value having an overtime limit characteristic for overexcitation limitation and an overexcitation limit. The limit line and the over-excitation limit pull-back value are set as fixed values, and the condition command is detected when an excitation failure occurs, and the operation state of the synchronous machine at a time before the time when the condition command occurs is detected. Automatically changes to the overexcitation limit detection start set value, the overexcitation limit line, and the overexcitation limit withdrawal value having the overtime limit characteristic of the overexcitation limit of the synchronous machine determined by the control device in the automatic voltage regulator. Instructed overexcitation And a device.

According to a fifth aspect of the present invention, when the automatic voltage regulator performs the excitation control of the synchronous machine by performing the duplexing, the overexcitation limiting control of the synchronous machine is performed by overexcitation of the synchronous machine. The over-excitation limit detection start set value, the over-excitation limit line, and the over-excitation return value, which have the time limit characteristic of the limit, are set as fixed values.At the same time, the synchronous machine operating point and field current are determined by the synchronous machine output voltage and output current. (Or the field voltage) and monitor the operating state of the synchronous machine. Therefore, when the excitation system failure occurs in the automatic voltage regulator, the automatic voltage regulator is determined by the operation state of the synchronous machine before the time when the condition command is generated. Even if the excitation system fails as described above, the state is not excessively excited, and the operation is switched to the standby system and the operation is continued. Also, even if one system has already failed and an excitation system failure such as a PT fuse blowout occurs during the one system operation by the standby system, the automatic voltage regulator will be over-excited to the point that the synchronous machine cannot withstand. It is not possible to continue the continuous operation state.

According to a sixth aspect of the present invention, in the excitation control device according to the first aspect, the no-load field current (or the no-load field voltage) of the synchronous machine when the synchronous machine is disconnected. Auxiliary command for instructing the over-excitation control device to automatically switch to the over-excitation limit detection start set value, the over-excitation limit line, and the over-excitation return value, which has a time limit characteristic of the over-excitation limitation of the fixed synchronous machine, A relay was provided between the circuit breaker and the overexcitation limiter.

The excitation control device according to claim 6 is substantially the same as in claim 1, except that when the synchronous machine is in the disconnected state, the no-load field current of the synchronous machine (or the no-load field current). By automatically switching to the over-excitation limit detection start set value, over-excitation limit line, and over-excitation pull-back value that have the time limit characteristic of the over-excitation limit of the fixed synchronous machine determined by the Even if the excitation system fails such as a blown PT fuse in the duplexing, the state is not excessively excited, and the operation is switched to the standby system and the operation is continued. Also, one of the systems has already failed,
Even if an excitation system failure such as a blown PT fuse occurs during single system operation by the standby system, the automatic voltage regulator does not reach an overexcitation state that the synchronous machine cannot withstand, and the continuous operation state can be continued. .

[0026] In the excitation control device according to a seventh aspect of the present invention, in the second aspect, the no-load field current (or the no-load field voltage) of the synchronous machine when the synchronous machine is disconnected. Auxiliary command for instructing the over-excitation control device to automatically switch to the over-excitation limit detection start set value, the over-excitation limit line, and the over-excitation return value, which has a time limit characteristic of the over-excitation limitation of the fixed synchronous machine, A relay was provided between the circuit breaker and the overexcitation limiter.

The excitation control device according to claim 7 is substantially the same as in claim 2, except that when the synchronous machine is in the disconnected state, the no-load field current of the synchronous machine (or the no-load field current). By automatically switching to the over-excitation limit detection start set value, over-excitation limit line, and over-excitation pull-back value that have the time limit characteristic of the over-excitation limit of the fixed synchronous machine determined by the Even if the excitation system fails such as a blown PT fuse in the duplexing, the state is not excessively excited, and the operation is switched to the standby system and the operation is continued. Also, one of the systems has already failed,
Even if an excitation system failure such as a blown PT fuse occurs during single system operation by the standby system, the automatic voltage regulator does not reach an overexcitation state that the synchronous machine cannot withstand, and the continuous operation state can be continued. .

[0028] In the excitation control device according to claim 8 of the present invention, in claim 3, the no-load field current (or no-load field voltage) of the synchronous machine when the synchronous machine is disconnected. Auxiliary command for instructing the over-excitation control device to automatically switch to the over-excitation limit detection start set value, the over-excitation limit line, and the over-excitation return value, which has a time limit characteristic of the over-excitation limitation of the fixed synchronous machine, A relay was provided between the circuit breaker and the overexcitation limiter.

The excitation control device according to claim 8 is substantially the same as in claim 3, except that when the synchronous machine is in the disconnected state, the no-load field current of the synchronous machine (or the no-load field current) A fixed pattern is automatically selected from the set value of the overexcitation limit detection start, the overexcitation limit line, and the overexcitation pullback value, which have the time limit characteristics of the overexcitation limit of the synchronous machine of a predetermined number of patterns determined by the magnetic voltage). The automatic voltage regulator is 2
Even if an excitation system failure such as a blown PT fuse occurs during overloading, the state is not excessively excited, and the operation is switched to a standby system and operation is continued. Also, even if one system has already failed and an excitation system failure such as a PT fuse blowout occurs during the one system operation by the standby system, the automatic voltage regulator will be over-excited to the point that the synchronous machine cannot withstand. It is not possible to continue the continuous operation state.

[0030] In the excitation control device according to claim 9 of the present invention, in claim 4, the no-load field current (or no-load field voltage) of the synchronous machine when the synchronous machine is disconnected. Auxiliary command for instructing the over-excitation control device to automatically switch to the over-excitation limit detection start set value, the over-excitation limit line, and the over-excitation return value, which has a time limit characteristic of the over-excitation limitation of the fixed synchronous machine, A relay was provided between the circuit breaker and the overexcitation limiter.

The excitation control device according to claim 9 is substantially the same as in claim 4, except that when the synchronous machine is in the disconnected state, the no-load field current of the synchronous machine (or the no-load field current) A fixed pattern is automatically selected from the set value of the overexcitation limit detection start, the overexcitation limit line, and the overexcitation pullback value, which have the time limit characteristics of the overexcitation limit of the synchronous machine of a predetermined number of patterns determined by the magnetic voltage). The automatic voltage regulator is 2
Even if an excitation system failure such as a blown PT fuse occurs during overloading, the state is not excessively excited, and the operation is switched to a standby system and operation is continued. Also, even if one system has already failed and an excitation system failure such as a PT fuse blowout occurs during the one system operation by the standby system, the automatic voltage regulator will be over-excited to the point that the synchronous machine cannot withstand. It is not possible to continue the continuous operation state.

[0032] In the excitation control device according to claim 10 of the present invention, in claim 5, when the synchronous machine is in the disconnected state,
Over-excitation limit detection start set value, over-excitation limit line, and over-excitation, which are determined by the no-load field current (or no-load field voltage) of the synchronous machine and have a fixed time limit characteristic of over-excitation limitation of the synchronous machine. An auxiliary relay for instructing the overexcitation control device is provided between the system-parallel circuit breaker and the overexcitation limiting device so as to automatically switch to the return value.

[0033] The excitation control device according to claim 10 is
Same as [Claim 5], but when the synchronous machine is in the disconnected state, the no-load field current (or no-load field voltage) of the synchronous machine
The automatic voltage regulator is duplicated by automatically switching to the over-excitation limit detection start set value, the over-excitation limit line, and the over-excitation pull-back value, which have the time limit characteristic of the over-excitation limit of the fixed synchronous machine determined by the Of these, even if an excitation system failure such as a blown PT fuse occurs, the state is not excessively excited, and the operation is switched to the standby system and operation is continued. Also, even if one system has already failed and an excitation system failure such as a PT fuse blowout occurs during the one system operation by the standby system, the automatic voltage regulator will be over-excited to the point that the synchronous machine cannot withstand. It is not possible to continue the continuous operation state.

[0034]

FIG. 1 is a block diagram of an excitation control device according to a first embodiment. In FIG. 1, the same reference numerals as those in FIG. 15 indicate the same or corresponding portions, and the description of the already described portions will be omitted. The feature of the configuration in this example is that the instep system detector 16A and the second system detector 16B are installed in each automatic voltage regulator.
And the corresponding instrument transformer 12A (12B) and current transformer
An input from 17A (17B) is introduced, and an output from each detector is introduced into each overexcitation limiting device 14A (14B).

In operation, the output current of the synchronous machine detected by the current transformer 17A and the output voltage of the synchronous machine detected by the transformer 12A are input to the system detector 16A. Then, the operation state of the synchronous machine and the field current of the synchronous machine in the operational capacity curve of the synchronous machine as shown in FIG. 2 are calculated.

In the operating capacity curve of the synchronous machine shown in the figure, the vertical axis indicates the reactive power (slow phase is positive direction, leading phase is negative direction) (MVA
R), and the horizontal axis indicates the active power (MW). Curve 700 is the temperature rise curve of the field winding, 800 is the temperature rise limit curve of the armature winding, 900 is the temperature rise limit curve of the core end, and the tip of the straight line extending from -1 / _Xd is shown. This is the operating point of the synchronous machine. _Xd is the synchronous impedance of the generator.

The overexcitation limit retraction value 100, the overexcitation limit detection start set value 200, the overexcitation limit line 300, and the standby system switching limit line 400 as shown in FIG. The system is controlled so as to continuously and automatically shift with a time limit until it exceeds the over-excitation detection limit line 600 calculated from the operating state while maintaining the over-excitation limit control. apparatus
Give instructions to 14A. Since the second party also performs the same control, the description is omitted.

Therefore, even if the field current of the synchronous machine fluctuates due to the operating state of the synchronous machine, the overexcitation limit return value, the overexcitation limit detection start set value, the overexcitation limit line, the standby system switching limit The line is automatically shifted until the line exceeds the overexcitation detection limit line, and the overexcitation limit control is performed.

According to this embodiment, even if the automatic voltage regulator becomes an excitation system failure such as a blown PT fuse due to redundancy, it does not become excessively excited, and is switched to a standby system to continue operation. You. Also, even if one system has already failed and an excitation system failure such as a PT fuse blowout occurs during one system operation with the standby system, the automatic voltage linear device will be in an overexcitation state that the synchronous machine cannot withstand. It is not possible to continue the continuous operation state.

[Claim 1] As another modified example, when the automatic voltage regulator performs the excitation control of the synchronous machine with duplexing, the over-excitation limit pull-back value and the over-excitation limit detection start setting value are set. , An overexcitation limit line and a standby system switching limit line are fixed values to perform overexcitation limit control of the synchronous machine.

In this system, when the excitation system failure occurs in the automatic voltage regulator, the service system is excluded, and the single system operation is performed by the standby system, the overexcitation limit pull-back value, the overexcitation limit detection start setting value, The overexcitation limit line and the standby system switching limit line are automatically and continuously shifted with a time limit until they exceed the overexcitation detection limit line calculated from the operation state while maintaining the proportional relationship, thereby maintaining the overexcitation limit line. To perform limit control,
This is a method of giving an instruction to overexcitation limiting control. This embodiment is the same as the embodiment of [Claim 1], and the description is omitted.

According to this method, even when the field current of the synchronous machine fluctuates due to the operating state of the synchronous machine, the over-excitation limit pull-back value, the over-excitation limit detection start set value,
The over-excitation limit line and the standby switching limit line are fixed values when the automatic voltage regulator is operating in duplicate, and the excitation system failure occurs in the automatic voltage regulator and the regular system is excluded. In the case of single system operation due to the standby system, the shift is automatically and timed continuously shifted while maintaining the proportional relationship until the overexcitation detection limit line calculated from the operation state of the synchronous machine is exceeded. By doing so, overexcitation limiting control is performed.

According to the present system, even if the automatic voltage regulator has an excitation system failure such as a blown PT fuse due to redundancy, it does not enter an excessive overexcitation state, and is switched to a standby system to continue operation. You. Also, even if one system has already failed and an excitation system failure such as a PT fuse blowout occurs during the one system operation by the standby system, the automatic voltage regulator will be over-excited to the point that the synchronous machine cannot withstand. It is not possible to continue the continuous operation state.

As described above, in the first embodiment and other embodiments, there is a method of inputting a field voltage instead of a field current to the overexcitation limiting device. FIG. 4 shows a configuration diagram of a corresponding excitation control device. The description of the configuration diagram is omitted.

FIG. 5 is a configuration diagram of an excitation control device corresponding to the second embodiment. In the figure, the same reference numerals as those in FIG. 1 indicate the same or corresponding portions, and the description of the already described portions will be omitted. The feature of the configuration of the present embodiment is that each failure detector 19A (19B) for detecting an excitation system failure is provided.

That is, when the automatic voltage regulator is operating in duplex, the same overexcitation limiting control as in claim 1 is performed, but when the automatic voltage regulator 9A is operating, the excitation system fails. When the system command detector 19A detects the above condition command, the condition command is given to the system A overexcitation limiter 14A.

Then, data of the operating state before the time when the condition command is generated is collected, and the over-excitation limit pull-back value 100 and the over-excitation limit detection as shown in FIG. The start setting value 200, the overexcitation limit line 300, and the standby system switching limit line 400 are automatically changed. Then, while maintaining the curve relationship already determined according to the operating state, the overexcitation limiting control is performed by this. Since the second party also performs the same control, the description is omitted.

According to the above configuration, even if the field current of the synchronous machine fluctuates due to the operating state of the synchronous machine, the overexcitation limit pull-back value, the overexcitation limit detection start setting value,
The overexcitation limit line and the standby system switching limit line are automatically shifted until they exceed the overexcitation detection limit line, and the overexcitation limit control is performed.

When an excitation system failure occurs, the overexcitation limit retraction value, the overexcitation limit detection start set value, the overexcitation limit line, and the standby system switching limit line, which are determined by the operating state before the failure occurrence time, are set. The over-excitation limiting control is performed by changing the relationship and maintaining these relationships.

According to the present embodiment, even if the automatic voltage regulator becomes an excitation system failure such as a blown PT fuse due to the redundancy, the excessive voltage does not become excessively excited, and the operation is switched to the standby system and the operation is performed. To be continued. Also, even if one system has already failed and an excitation system failure such as a PT fuse blowout occurs during the one system operation by the standby system, the automatic voltage regulator will be over-excited to the point that the synchronous machine cannot withstand. And the continuous operation state can be continued.

[Claim 2] As another modified example, when an excitation system failure occurs during operation of the automatic voltage regulator due to duplication, the failure occurrence time is determined by the operation state.
The overexcitation limit pullback value, the overexcitation limit detection start set value, the overexcitation limit line, and the standby system switching limit line are automatically changed to maintain these relationships, thereby performing the overexcitation limit control. Since the configuration diagram and the like are the same as those of the second embodiment, the description is omitted.

According to the above configuration, even when the field current of the synchronous machine fluctuates due to the operation state of the synchronous machine, the overexcitation limit pull-back value, the overexcitation limit detection start setting value,
The overexcitation limit line and the standby system switching limit line are automatically shifted until they exceed the overexcitation detection limit line, and the overexcitation limit control is performed.

When an excitation system failure occurs, the overexcitation limit pullback value, which is determined by the operating state of the failure occurrence time,
The setting is changed to the overexcitation limit detection start set value, the overexcitation limit line, and the standby system switching limit line, and these relationships are maintained, whereby the overexcitation limit control is performed.

According to the present embodiment, even if the automatic voltage regulator becomes an excitation system failure such as a blown PT fuse due to redundancy, it does not reach an excessive overexcitation state and is switched to a standby system to continue operation. Is done. Also, even if one system has already failed and an excitation system failure such as a PT fuse blow occurs during one system operation by the standby system,
The automatic voltage regulator does not reach an overexcitation state that the synchronous machine cannot withstand, and the continuous operation state can be continued.

[Claim 2] As another modified example, one system of the automatic voltage regulator is excluded, and when the operation is switched to the single system operation by the standby system, when an excitation system failure occurs, a failure occurs. Automatically changes to the over-excitation limit retraction value, over-excitation limit detection start setting value, over-excitation limit line, and standby system switching limit line, which are determined by the operation status of the time before the occurrence time, and maintains these relationships. Then, there is a method of limiting overexcitation.

According to the above configuration, even if the field current of the synchronous machine fluctuates due to the operating state of the synchronous machine, the overexcitation limit pull-back value, the overexcitation limit detection start setting value,
The overexcitation limit line and the standby system switching limit line are automatically shifted until they exceed the overexcitation detection limit line, and the overexcitation limit control is performed.

In the case where one system of the automatic voltage regulator is excluded and the operation is switched to the single system operation by the standby system, when an excitation system failure occurs, it is determined based on the operation state at a time earlier than the failure occurrence time. Over-excitation limit pull back value,
The overexcitation limit detection start set value, the overexcitation limit line, and the standby switching limit line are automatically changed to the overexcitation limit control.

According to the present embodiment, even if the automatic voltage regulator becomes a failure of the excitation system such as a blown PT fuse due to redundancy, the excessive voltage is not overexcited, and the operation is switched to the standby system to continue the operation. Is done. Also, even if one system has already failed and an excitation system failure such as a PT fuse blow occurs during one system operation by the standby system,
The automatic voltage regulator allows the continuous operation state to be continued without reaching an overexcitation state that the synchronous machine cannot withstand.

[Claim 2] As another modified example, one system of the automatic voltage regulator is excluded, and when the operation is switched to the single system operation by the standby system, when an excitation system failure occurs, a failure occurs. Automatically changes to the over-excitation limit pull-back value, over-excitation limit detection start setting value, over-excitation limit line, and standby system switching limit line, which are determined by the operating state of the occurrence time.
This is a method for limiting overexcitation.

According to the present embodiment, even if the automatic voltage regulator becomes a failure of the excitation system such as a blown PT fuse due to the redundancy, the excessive voltage does not become excessively excited, and the operation is switched to the standby system to continue the operation. Is done. Also, even if one system has already failed and an excitation system failure such as a PT fuse blow occurs during one system operation by the standby system,
The continuous operation state can be continued without the automatic voltage regulator reaching an overexcitation state that the synchronous machine cannot withstand.

As described above, in the second embodiment and other embodiments, a field voltage may be input instead of the field current as an input of the overexcitation limiting device. FIG. 6 shows a configuration diagram of the excitation control device. The description of the configuration diagram is omitted.

Next, a third embodiment will be described. In the present embodiment, a plurality of operation patterns are created in advance, and a predetermined one is automatically selected from the plurality of operation patterns according to the operation state of the synchronous machine and the field current. The configuration of the device is the same as that of FIG.

Accordingly, the output current of the synchronous machine detected by the instep transformer 17A and the output voltage of the synchronous machine detected by the instep instrument transformer 12A are input to the instep detector 16A. Then, the operation state of the synchronous machine and the field current of the synchronous machine in the operation capability curve of the synchronous machine as shown in FIG.

As shown in FIG. 7, the operation state of the synchronous machine is divided into several patterns,..., And the over-excitation limit pull-back value 10 shown in FIG.
0 (100-1), overexcitation limit detection start set value 200
(200-1), overexcitation limit line 300 (300-1),
The in-system overexcitation control device 14 automatically selects a pattern in accordance with the operation state of the synchronous machine from the standby system switching limit line 400 (400-1), thereby performing overexcitation limiting control.
Give A instructions. Since the second party also performs the same control, the description is omitted. The solid line indicates the pattern, the dashed line indicates the pattern, and the other patterns are omitted.

According to the above configuration, even if the field current of the synchronous machine fluctuates due to the operating state of the synchronous machine, a predetermined number of patterns of the overexcitation limit pull-back value,
A pattern according to the operation state of the synchronous machine is automatically selected from the set value of the overexcitation limit detection start, the overexcitation limit line, and the standby system switching limit line, whereby the overexcitation limit control is performed.

According to the present embodiment, even if the automatic voltage regulator becomes a failure in the excitation system such as a blown PT fuse due to the redundancy, the excessive voltage does not become excessively excited, and the operation is switched to the standby system. Is continued. Also, even if the excitation system failure such as the PT fuse blowout occurs during the one-system operation of the standby system due to the failure of one system, the automatic voltage regulator will not be able to withstand the over-excitation state of the synchronous machine. It is not possible to continue the continuous operation state.

[Claim 3] As another modified example, when the automatic voltage regulator performs the excitation control of the synchronous machine in a duplex manner, the overexcitation control pullback value and the overexcitation limit time start set value are set. , The overexcitation limit line and the standby system switching limit line may be set to fixed values. In this case, the overexcitation limiting control is performed, and when the excitation system failure occurs in the automatic voltage regulator and the normal system is excluded and the standby system is operated in a single system, the number determined in advance by the operation state of the synchronous machine Of the pattern over-excitation limit pull-back value, over-excitation limit detection start set value, over-excitation limit line, and standby system switching limit line, a pattern according to the operating state of the synchronous machine is automatically selected, and the over-excitation limit is thereby set. This is because an instruction may be given to the overexcitation limiting device to perform control.

According to the above configuration, even if the field current of the synchronous machine fluctuates due to the operating state of the synchronous machine, the overexcitation limit pull-back value, the overexcitation limit detection start setting value,
When the overvoltage limiter and the standby system switching limiter are operating with the automatic voltage regulator being duplicated, the control is performed with a fixed value.

When an excitation system failure occurs in the automatic voltage regulator, the service system is excluded, and the single system operation is performed by the standby system, a predetermined number of patterns are determined according to the operation state of the synchronous machine. Of the over-excitation limit return value, over-excitation limit detection start set value, over-excitation limit line, and standby system switching limit line. Is performed.

According to this embodiment, even if the automatic voltage regulator becomes an excitation system failure such as a blown PT fuse due to redundancy, the excessive voltage does not become excessively excited, and the operation is switched to the standby system to continue the operation. Is done. Also, even if the excitation system failure such as the PT fuse blowout occurs during the one-system operation of the standby system due to the failure of one system, the automatic voltage regulator will not be able to withstand the over-excitation state of the synchronous machine. It is not possible to continue the continuous operation state.

As described above, as another modified example of [Claim 3], a field voltage may be input as an input to the overexcitation limiting device instead of the field current.

Next, a fourth embodiment will be described. In the present embodiment, when detecting an excitation system failure, instead of simply selecting an operation pattern created in advance, a plurality of operation patterns created based on an operation state at a time earlier than a condition command generation time of failure detection. Is selected from the list below. Therefore, the configuration of the device is the same as that of FIG.

Therefore, when the automatic voltage regulator is operating in duplicate, the overexcitation limiting control is performed in the same manner as in [Claim 3]. However, when the automatic voltage regulator 9A is operating, the excitation system is controlled. The fault condition command is detected by the system A fault detector 19A.
The condition command is given to the system A overexcitation limiter 14A, and the data of the operating state before the time when the condition command is generated is collected.

As shown in FIG. 7, the operation state of the synchronous machine is divided into several patterns, and the over-excitation limit pull-back value 100 and the over-excitation limit detection start set value 200 as shown in FIG. , The pattern corresponding to the operating state of the synchronous machine is automatically selected from the overexcitation limit line 300 and the standby system switching limit line 400, and the pattern is maintained to perform the overexcitation limit control. Since the second party also performs the same control, the description is omitted.

According to the above configuration, even when the field current of the synchronous machine fluctuates due to the operating state of the synchronous machine, a predetermined number of patterns of the overexcitation limit pullback value,
A pattern according to the operation state of the synchronous machine is automatically selected from the set value of the overexcitation limit detection start, the overexcitation limit line, and the standby system switching limit line, whereby the overexcitation limit control is performed.

When an excitation system failure occurs, the overexcitation limit pullback value, overexcitation limit detection start setting value, overexcitation limit line,
The pattern of the standby system switching limit line is automatically selected and maintained, whereby the overexcitation limiting control is performed.

According to the present embodiment, even if the automatic voltage regulator becomes a failure of the excitation system such as a blown PT fuse due to the redundancy, the excessive voltage does not become excessively excited, and the operation is switched to the standby system. Is continued. Also, even if one system has already failed and an excitation system failure such as a PT fuse blowout occurs during the one system operation by the standby system, the automatic voltage regulator will be over-excited to the point that the synchronous machine cannot withstand. It is not possible to continue the continuous operation state.

[Claim 4] As another modified example, when an excitation system failure occurs during operation of the automatic voltage regulator due to duplexing, the failure occurrence time is determined by the operation state.
The pattern of the overexcitation limit retraction value, the overexcitation limit detection start set value, the overexcitation limit line, and the pattern of the standby system switching limit line may be automatically selected and maintained, and the overexcitation limit control may be performed by this. .

According to the above configuration, even when the field current of the synchronous machine fluctuates depending on the operating state of the synchronous machine, a predetermined number of patterns of the overexcitation limit pull-back value,
A pattern according to the operation state of the synchronous machine is automatically selected from the set value of the overexcitation limit detection start, the overexcitation limit line, and the standby system switching limit line, whereby the overexcitation limit control is performed.

When an excitation system failure occurs, the overexcitation limit pullback value, which is determined by the operating state of the failure occurrence time,
The pattern of the over-excitation limit detection start set value, over-excitation limit line, and standby system switching limit line pattern are automatically selected and maintained.
Thus, overexcitation limiting control is performed.

According to the present embodiment, even if the automatic voltage regulator becomes an excitation system failure such as a blown PT fuse due to redundancy, it does not become excessively overexcited, and is switched to the standby system to continue operation. Is done. Also, even if one system has already failed and an excitation system failure such as a PT fuse blow occurs during one system operation by the standby system,
The automatic voltage regulator does not reach an overexcitation state that the synchronous machine cannot withstand, and the continuous operation state can be continued.

[Claim 4] As another modified example, one system of the automatic voltage regulator is excluded, and when the operation is switched to the single system operation by the standby system, a failure occurs in the excitation system. The pattern of the over-excitation limit retraction value, over-excitation limit detection start setting value, over-excitation limit line, and standby system switching limit line pattern determined by the operation state before the occurrence time is automatically selected and maintained. This may limit overexcitation.

According to the above configuration, even if the field current of the synchronous machine fluctuates due to the operating state of the synchronous machine, the overexcitation limit pull-back value, the overexcitation limit detection start setting value,
The pattern of the overexcitation limit line and the standby system switching limit line is automatically selected, and the overexcitation limit control is performed.

In the case where one system of the automatic voltage regulator is excluded and the operation is switched to the single system operation by the standby system, when an excitation system failure occurs, it is determined by the operation state before the failure occurrence time. The pattern of the overexcitation limit retraction value, the overexcitation limit detection start set value, the overexcitation limit line, and the pattern of the standby system switching limit line are automatically selected and maintained, and the overexcitation limit control is performed.

According to the present embodiment, even if the automatic voltage regulator becomes an excitation system failure such as a blown PT fuse due to redundancy, the excessive voltage does not become excessively excited, and the operation is switched to the standby system to continue the operation. Is done. Also, even if one system has already failed and an excitation system failure such as a PT fuse blow occurs during one system operation by the standby system,
The automatic voltage regulator does not reach an overexcitation state that the synchronous machine cannot withstand, and continuous operation can be continued.

[Claim 4] As another modified example, one system of the automatic voltage regulator is excluded, and when the operation is switched to the single system operation by the standby system, when an excitation system failure occurs, a failure occurs. The pattern of the overexcitation limit retraction value, the overexcitation limit detection start set value, the overexcitation limit line, and the standby system switching limit line pattern, which is determined by the operation state of the generation time, is automatically selected and maintained. Overexcitation may be limited.

According to the above configuration, even when the field current of the synchronous machine fluctuates due to the operating state of the synchronous machine, the overexcitation limit pull-back value, the overexcitation limit detection start setting value,
The pattern of the overexcitation limit line and the standby system switching limit line is automatically selected, and the overexcitation limit control is performed.

When one system of the automatic voltage regulator is excluded and the system is switched to the single system operation by the standby system, when an excitation system failure occurs, the overexcitation limit pullback value determined by the operation state of the failure occurrence time is determined. , The over-excitation limit detection start set value, the pattern of the over-excitation limit line, and the pattern of the standby system switching limit line are automatically selected and maintained, whereby the over-excitation limit control is performed.

According to the present embodiment, even if the automatic voltage regulator has an excitation system failure such as a blown PT fuse due to redundancy, it does not become excessively overexcited, and is switched to the standby system to continue operation. Is done. Also, even if one system has already failed and an excitation system failure such as a PT fuse blow occurs during one system operation by the standby system,
The automatic voltage regulator does not reach an overexcitation state that the synchronous machine cannot withstand, and continuous operation can be continued.

As described above, as another modification of [Claim 4], a field voltage may be input as an input of the overexcitation limiting device instead of the field current.

Next, a fifth embodiment will be described. In the present embodiment, the overexcitation control during operation is performed with the fixed value of the overexcitation limit detection start selection value, the overexcitation limit line, and the overexcitation limit withdrawal value. Is performed at each of the above-mentioned values, which is determined by the operating state of the vehicle.

The output current of the synchronous machine detected by the former transformer 17A and the output voltage of the synchronous machine detected by the former transformer 12A are input to the former detector 16A, and FIG. The operating state of the synchronous machine and the field current of the synchronous machine in the operating capacity curve of the synchronous machine as shown are calculated, and the operating state of the synchronous machine is monitored.

The over-excitation limit control of the synchronous machine is performed by over-excitation limit retraction value 100, over-excitation limit detection start set value 200, over-excitation limit line 300, and standby system switching limit line 4 as shown in FIG.
00, an instruction is given to the upper-system excitation limiter 14A.

Here, when the in-system automatic fault voltage detector 9A detects a condition command for the excitation system failure while the in-system automatic voltage regulator 9A is in operation, the condition command is given to the in-system over-excitation limiter 14A. The data of the operation state before the time when the condition command is generated is collected, and the overexcitation limit retraction value 100, the overexcitation restriction detection start set value 200, and the overexcitation limit detection start value 200 as shown in FIG. It is automatically changed to the excitation limit line 300 and the standby system switching limit line 400, and these are maintained.
Thus, overexcitation limiting control is performed. Since the second party also performs the same control, the description is omitted.

According to the above configuration, when an excitation system failure occurs during operation of the automatic voltage regulator, it is determined by the operating state of the synchronous machine at a time earlier than the failure occurrence time.
The overexcitation limit return value, the overexcitation limit detection start set value, the overexcitation limit line, and the standby system switching limit line are automatically changed and maintained, and the overexcitation limit control is performed.

According to the present embodiment, even if the automatic voltage regulator becomes an excitation system failure such as a blown PT fuse due to redundancy, it does not become excessively overexcited, and is switched to the standby system to operate. Is continued. Also, even if one system has already failed and an excitation system failure such as a PT fuse blowout occurs during the one system operation by the standby system, the automatic voltage regulator will be over-excited to the point that the synchronous machine cannot withstand. It is not possible to continue the continuous operation state.

[Claim 5] As another modified example, when an excitation system failure occurs during operation of the automatic voltage regulator due to duplication, the synchronous machine is operated for the time when the excitation system failure occurred. The over-excitation limit control may be performed by switching to the over-excitation limit return value, the over-excitation limit detection start set value, the over-excitation limit line, and the standby system switching limit line determined by the state.

According to the above configuration, when an excitation system failure occurs during the operation of the automatic voltage regulator, the overexcitation limit pull-back value and the overexcitation limit detection start determined by the operation state of the synchronous machine at the time when the failure occurs. The set value, the overexcitation limit line, and the standby system switching limit line are automatically changed and maintained, whereby the overexcitation limit control is performed.

According to this example, even if the automatic voltage regulator becomes an excitation system failure such as a blown PT fuse due to redundancy, it does not enter an excessive overexcitation state and switches to a standby system to continue operation. Is done. Also, even if one system has already failed and an excitation system failure such as a PT fuse blow occurs during one system operation by the standby system,
The automatic voltage regulator does not reach an overexcitation state that the synchronous machine cannot withstand, and the continuous operation state can be continued.

As described above, as another modified example of [Claim 5], a field voltage may be input as an input to the overexcitation limiting device instead of the field current.

FIG. 9 is a configuration diagram of an excitation control device corresponding to the sixth embodiment. In the figure, the same reference numerals as those in FIG. 1 indicate the same or corresponding portions, and the description of the already described portions will be omitted. The feature of the configuration of the present embodiment is that an auxiliary relay 20 that operates according to the opening and closing of the system parallel circuit breaker 4 is provided.

Therefore, the open / closed state of the system parallel breaker 4 is output to the instep-system over-excitation limiting device 14A and the in-system over-excitation limiting device 14B via the auxiliary relay 20, respectively. When the system-parallel circuit breaker 4 is closed, the same control as the excitation control device according to claim 1 is performed.

Next, when the system parallel breaker 4 is open, that is, in the disconnected state, it is determined by the no-load field current of the synchronous machine.
As shown in FIG. 10, the fixed value of the overexcitation limit pullback value 100-1 at the time of disconnection, the overexcitation limit detection start set value 200-1,
Overexcitation limit line 300-1, standby system switching limit line 400-1
With this, overexcitation limiting control is performed.

Each value at the time of disconnection is calculated by the ratio of the field current (or field voltage) of the synchronous machine between when the load is applied and when no load is applied. In general, (field current at load (or field voltage)): (field current at no load (or field voltage)) =
(2-3): 1. The above method can be applied to other embodiments of [claim 1].

According to the above configuration, even when the field current of the synchronous machine fluctuates due to the operating state of the synchronous machine, the overexcitation limit pull-back value, the overexcitation limit detection start setting value,
The overexcitation limit line and the standby system switching limit line are automatically shifted until they exceed the overexcitation detection limit line, and the overexcitation limit control is performed.

According to the present embodiment, even if the automatic voltage regulator becomes an excitation system failure such as a blown PT fuse due to redundancy, it does not enter an excessive overexcitation state and switches to a standby system to operate. Is continued. Also, even if one system has already failed and an excitation system failure such as a PT fuse blowout occurs during the one system operation by the standby system, the automatic voltage regulator will be over-excited to the point that the synchronous machine cannot withstand. It is not possible to continue the continuous operation state.

As described above, as another modified example of [Claim 6], a field voltage detected by a voltage transformer may be input as an input to the overexcitation limiting device instead of the field current. FIG. 11 shows a configuration diagram of a corresponding excitation control device.

FIG. 12 is a configuration diagram of an excitation control device corresponding to the seventh embodiment. In the figure, the same reference numerals as those in FIG. 5 indicate the same or corresponding portions, and the description of the already described portions will be omitted. The configuration of this embodiment is characterized in that an auxiliary relay 20 that operates according to the switching operation of the system parallel breaker 4 is connected to the input of each of the overexcitation limiters 14A and 14B shown in FIG. is there.

Accordingly, the open / closed state of the circuit breaker 4 for system parallel is output to the system A over-excitation limiting device 14A and the system B over-excitation limiting device 14B via the auxiliary relay 20, respectively. When the system parallel circuit breaker 4 is closed, the same control as the excitation control device described in [claim 2] is performed.

Next, when the system parallel breaker 4 is open, that is, in the disconnected state, it is determined by the no-load field current of the synchronous machine.
As shown in FIG. 10, the fixed value of the overexcitation limit pullback value 100-1 at the time of disconnection, the overexcitation limit detection start set value 200-1,
Overexcitation limit line 300-1, standby system switching limit line 400-1
With this, overexcitation limiting control is performed.

Each value at the time of disconnection is calculated by the ratio of the field current (or field voltage) of the synchronous machine between when the load is applied and when no load is applied. In general, (field current at load (or field voltage)): (field current at no load (or field voltage)) =
(2-3): 1. The above method can be applied to other embodiments of [claim 2].

According to the above configuration, even when the field current of the synchronous machine fluctuates due to the operating state of the synchronous machine, the overexcitation limit pullback value, the overexcitation limit detection start set value,
The overexcitation limit line and the standby system switching limit line are automatically shifted until they exceed the overexcitation detection limit line, and the overexcitation limit control is performed.

According to the present embodiment, even if the automatic voltage regulator becomes an excitation system failure such as a blown PT fuse due to redundancy, it does not become excessively overexcited, and is switched to the standby system to operate. Is continued. Also, even if one system has already failed and an excitation system failure such as a PT fuse blowout occurs during the one system operation by the standby system, the automatic voltage regulator will be over-excited to the point that the synchronous machine cannot withstand. It is not possible to continue the continuous operation state.

As described above, as another modified example of [Claim 7], a field voltage detected by a voltage transformer may be input as an input to the overexcitation limiting device instead of the field current. FIG. 13 shows a configuration diagram of a corresponding excitation control device.

FIG. 13 is a block diagram of an excitation control device corresponding to the eighth embodiment, which is the same as [Claim 6]. This embodiment is as described in the sixth embodiment,
The feature is that the auxiliary relay 20 is provided. In the figure,
1 denote the same or corresponding parts, and a description of the parts already described is omitted. In this embodiment, the open / closed state of the system parallel circuit breaker 4 is output to the system A over-excitation limiting device 14A and the system B over-excitation limiting device 14B via the auxiliary relay 20, respectively. When the system-parallel circuit breaker 4 is closed, the same control as the excitation control device according to claim 3 is performed.

Next, when the system parallel circuit breaker 4 is open, that is, in the disconnected state, it is determined by the no-load field current of the synchronous machine.
As shown in FIG. 14, the fixed value of the overexcitation limit pullback value 100-1 at the time of disconnection, the overexcitation limit detection start set value 200-1,
Overexcitation limit line 300-1, standby system switching limit line 400-1
With this, overexcitation limiting control is performed.

Each value at the time of disconnection is calculated by the ratio of the field current (or field voltage) of the synchronous machine between when the load is applied and when the load is not loaded. In general, (field current at load (or field voltage)): (field current at no load (or field voltage)) =
(2-3): 1. The above method can be applied to the other embodiment of [Claim 3].

According to the above configuration, even if the field current of the synchronous machine fluctuates due to the operating state of the synchronous machine, the overexcitation limit pull-back value, the overexcitation limit detection start setting value,
The overexcitation limit line and the standby system switching limit line are automatically shifted until they exceed the overexcitation detection limit line, and the overexcitation limit control is performed.

According to the present embodiment, even if the automatic voltage regulator becomes an excitation system failure such as a blown PT fuse due to redundancy, it does not enter an excessive overexcitation state and switches to a standby system to operate. Is continued. Also, even if one system has already failed and an excitation system failure such as a PT fuse blowout occurs during the one system operation by the standby system, the automatic voltage regulator will be over-excited to the point that the synchronous machine cannot withstand. It is not possible to continue the continuous operation state.

As described above, as another modified example of [Claim 8], a field voltage detected by a voltage transformer may be input as an input of the overexcitation limiting device instead of the field current.

FIG. 12 is a configuration diagram of an excitation control device corresponding to the ninth embodiment, which is the same as [Claim 7]. This embodiment is, as already described in the seventh embodiment,
The feature is that the auxiliary relay 20 is provided. In the figure,
The same reference numerals as those in FIG. 5 indicate the same or corresponding portions, and a description of the already described portions will be omitted. In this embodiment, the open / closed state of the system parallel circuit breaker 4 is output to the system A over-excitation limiting device 14A and the system B over-excitation limiting device 14B via the auxiliary relay 20, respectively. When the system parallel circuit breaker 4 is closed, the same control as the excitation control device according to claim 4 is performed.

Next, when the system parallel breaker 4 is open, that is, in the disconnected state, it is determined by the no-load field current of the synchronous machine.
As shown in FIG. 14, the fixed value of the overexcitation limit pullback value 100-1 at the time of disconnection, the overexcitation limit detection start set value 200-1,
Overexcitation limit line 300-1, standby system switching limit line 400-1
With this, overexcitation limiting control is performed.

Each value at the time of disconnection is calculated by the ratio of the field current (or field voltage) of the synchronous machine between when the load is applied and when no load is applied. In general, (field current at load (or field voltage)): (field current at no load (or field voltage)) =
(2-3): 1. The above method can be applied to the other embodiment of [Claim 3].

According to the above configuration, even when the field current of the synchronous machine fluctuates due to the operating state of the synchronous machine, the overexcitation limit pullback value, the overexcitation limit detection start setting value,
The overexcitation limit line and the standby system switching limit line are automatically shifted until they exceed the overexcitation detection limit line, and the overexcitation limit control is performed.

According to the present embodiment, even if the automatic voltage regulator has an excitation system failure such as a blown PT fuse due to redundancy, it does not become excessively excited and is switched to the standby system to operate. Is continued. Also, even if one system has already failed and an excitation system failure such as a PT fuse blowout occurs during the one system operation by the standby system, the automatic voltage regulator will be over-excited to the point that the synchronous machine cannot withstand. It is not possible to continue the continuous operation state.

As described above, as another modified example of [Claim 9], a field voltage detected by a voltage transformer may be input as an input to the overexcitation limiting device instead of the field current. FIG. 13 shows a configuration diagram of a corresponding excitation control device.

FIG. 12 is a block diagram of an excitation control device corresponding to the tenth embodiment. [Claim 7] and [Claim 9]
Is the same as In the figure, the same reference numerals as those in FIG. 5 indicate the same or corresponding portions, and the description of the already described portions will be omitted.
The open / closed state of the system parallel circuit breaker 4 is output via the auxiliary relay 20 to the system A over-excitation limiting device 14A and the system B over-excitation limiting device 14B, respectively. When the system parallel breaker 4 is closed, the same control as the excitation control device according to claim 5 is performed.

Next, when the system parallel breaker 4 is open, that is, in the disconnected state, it is determined by the no-load field current of the synchronous machine.
As shown in FIG. 14, the fixed value of the overexcitation limit pullback value 100-1 at the time of disconnection, the overexcitation limit detection start set value 200-1,
Overexcitation limit line 300-1, standby system switching limit line 400-1
With this, overexcitation limiting control is performed.

Each value at the time of disconnection is calculated by the ratio of the field current (or field voltage) of the synchronous machine between when the load is applied and when the load is not loaded. In general, (field current at load (or field voltage)): (field current at no load (or field voltage)) =
(2-3): 1. The above method can be applied to the other embodiment of [Claim 3].

According to the above configuration, even if the field current of the synchronous machine fluctuates due to the operating state of the synchronous machine, the overexcitation limit pull-back value, the overexcitation limit detection start setting value,
The overexcitation limit line and the standby system switching limit line are automatically shifted until they exceed the overexcitation detection limit line, and the overexcitation limit control is performed.

According to the present embodiment, even if the automatic voltage regulator becomes a failure in the excitation system such as a blown PT fuse due to the redundancy, the excessive voltage does not become excessively excited and the operation is switched to the standby system. Is continued. Also, even if one system has already failed and an excitation system failure such as a PT fuse blowout occurs during the one system operation by the standby system, the automatic voltage regulator will be over-excited to the point that the synchronous machine cannot withstand. It is not possible to continue the continuous operation state.

As described above, as another modification of [Claim 10], a field voltage detected by a voltage transformer may be input as an input of the overexcitation limiting device instead of the field current. FIG. 13 shows a configuration diagram of a corresponding excitation control device.

[0133]

As described above, according to the present invention, the automatic voltage regulator does not become excessively overexcited even if the excitation system fails, such as the PT fuse being blown out of the duplex system. And the operation is continued. Also, even if one system has already failed and an excitation system failure such as a PT fuse blowout occurs during the one system operation by the standby system, the automatic voltage regulator will be over-excited to the point that the synchronous machine cannot withstand. In this case, the continuous operation state can be continued, and the synchronous machine can be operated smoothly.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an excitation control device according to [claim 1] of the present invention.

FIG. 2 is an operating capacity curve diagram of the synchronous machine according to claim 12 of the present invention.

FIG. 3 is an overexcitation limiting diagram according to [claim 1] of the present invention.

FIG. 4 is a modified example of FIG. 1;

FIG. 5 is a configuration diagram of an excitation control device according to [claim 2], [claim 4], and [claim 5] of the present invention.

FIG. 6 is a modified example of FIG. 5;

FIG. 7 is an operating capacity curve diagram of FIG. 5;

FIG. 8 is an overexcitation limit diagram of FIG. 5;

FIG. 9 is a configuration diagram of an excitation control device according to [claim 6] and [claim 7] of the present invention.

FIG. 10 is an overexcitation limiting diagram of FIG. 9;

FIG. 11 is a modified example of FIG. 9.

FIG. 12 is a configuration diagram of an excitation control device according to [claim 8], [claim 9], and [claim 10] of the present invention.

FIG. 13 is a modified example of FIG. 12.

FIG. 14 is an overexcitation limiting diagram of FIG. 12;

FIG. 15 is a configuration diagram showing a conventional example.

FIG. 16 is an overexcitation limiting diagram of a conventional example.

FIG. 17 is a failure logic of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Synchronous machine 2 Field winding 3 Main transformer 4 Circuit breaker for parallel system 5 Power system 6 Thyristor rectifier 7 Field circuit breaker 8 Excitation power transformer 9A, 9B Automatic voltage regulator 10A, 10B Controller 11A, 11B Fuse 12A, 12B, 18A, 18B Instrument transformer 13A, 13B Voltage setting device 14A, 14B Overexcitation limiter 15A, 15B, 17A, 17B Instrument current transformer 16A, 16B detector 19A, 19B Fault detector 20 Auxiliary relay

Claims (10)

[Claims] 1. An excitation control device for inputting an output voltage and a field current of a synchronous machine and performing excitation control of the synchronous machine by an automatic voltage regulator having a duplex configuration. Detecting means for detecting a field current (field voltage); an overexcitation limit detection start set value, an overexcitation limit line, and an overexcitation limit line having an infinite time characteristic of an overexcitation limit of the synchronous machine depending on an operation state of the detection means. By automatically shifting the pull-back value to the calculated over-excitation detection limit line while maintaining the proportional relationship with each other, the over-excitation limit control of the synchronous machine is performed by the instruction of the detection means. An over-excitation limiting device for instructing a control device of each system in the automatic voltage adjusting device. 2. The synchronous machine according to claim 1, wherein a condition command is detected based on the occurrence of an excitation system failure, and the condition is determined by an operation state of the synchronous machine at a time before the time when the condition command is generated. The automatic voltage adjustment device is configured to automatically change the overexcitation limit detection start set value, the overexcitation limit line, and the overexcitation limit withdrawal value having the overtime limit characteristic of the overexcitation limit of the machine to perform the overexcitation limit control. An excitation control device, comprising: a failure detector for instructing each system of the overexcitation limiting device. 3. The over-excitation limit detection start set value and the over-excitation limit line according to claim 1, wherein the detecting means has a predetermined number of patterns of over-excitation limit inversion time characteristics according to the operating state of the synchronous machine. And an overexcitation limit pullback value. 4. The synchronous machine according to claim 3, wherein the condition command is detected based on the occurrence of the excitation system failure, and the condition command is selected according to the operation state of the synchronous machine before the time when the condition command occurs. Automatically select the pattern of the overexcitation limit detection start set value, the overexcitation limit line, and the overexcitation limit withdrawal value having the time limit characteristic of the overexcitation limit of the synchronous machine, and set the respective systems in the automatic voltage regulator. An excitation control device comprising a failure detector for instructing the over-excitation limiting device. 5. An excitation control device which receives an output voltage and a field current of a synchronous machine and performs excitation control of the synchronous machine by an automatic voltage regulator having a duplex configuration, operates in a duplex mode. When performing the excitation control during the medium, the overexcitation limit control of the synchronous machine sets the overexcitation limit detection start set value, the overexcitation limit line, and the overexcitation limit pullback value that have the time limit characteristic for overexcitation to fixed values. When an excitation system failure occurs, the condition command is detected based on the occurrence of the excitation failure, and the synchronous machine determined by the operating state of the synchronous machine at a time before the time when the condition command occurred is detected. The overexcitation limit detection start setting value, the overexcitation limit line, and the overexcitation limit pullback value having the overtime limit characteristic of the overexcitation limit are automatically changed to the overexcitation limit, and the overexcitation is instructed to the control device in the automatic voltage regulator. Having a control device An excitation control device characterized by the above-mentioned. 6. The time limit of over-excitation limitation of the fixed synchronous machine according to claim 1, which is determined by a no-load field current (or no-load field voltage) of the synchronous machine when the synchronous machine is disconnected. An auxiliary relay that instructs the overexcitation control device to automatically switch to the overexcitation limit detection start set value with characteristics, the overexcitation limit line, and the overexcitation pullback value between the system parallel circuit breaker and the overexcitation limit device. An excitation control device, comprising: 7. The time limit according to claim 2, wherein when the synchronous machine is disconnected, the overexcitation limit of the fixed synchronous machine is determined by a no-load field current (or a no-load field voltage) of the synchronous machine. An auxiliary relay that instructs the overexcitation control device to automatically switch to the overexcitation limit detection start set value with characteristics, the overexcitation limit line, and the overexcitation pullback value between the system parallel circuit breaker and the overexcitation limit device. An excitation control device, comprising: 8. The time limit of the synchronous machine according to claim 3, which is determined by a no-load field current (or no-load field voltage) of the synchronous machine when the synchronous machine is disconnected. An auxiliary relay that instructs the overexcitation control device to automatically switch to the overexcitation limit detection start set value with characteristics, the overexcitation limit line, and the overexcitation pullback value between the system parallel circuit breaker and the overexcitation limit device. An excitation control device, comprising: 9. The time limit according to claim 4, wherein when the synchronous machine is disconnected, the overexcitation limit of the fixed synchronous machine is determined by a no-load field current (or no-load field voltage) of the synchronous machine. An auxiliary relay that instructs the overexcitation control device to automatically switch to the overexcitation limit detection start set value with characteristics, the overexcitation limit line, and the overexcitation pullback value between the system parallel circuit breaker and the overexcitation limit device. An excitation control device, comprising: 10. A time limit of over-excitation limitation of the fixed synchronous machine according to claim 5, which is determined by a no-load field current (or no-load field voltage) of the synchronous machine when the synchronous machine is disconnected. An auxiliary relay that instructs the overexcitation control device to automatically switch to the overexcitation limit detection start set value with characteristics, the overexcitation limit line, and the overexcitation pullback value between the system parallel circuit breaker and the overexcitation limit device. An excitation control device, comprising: