JP4080821B2 - Generator excitation control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a generator excitation control device, and more particularly to a device for preventing overexcitation and overvoltage of a generator.
[0002]
[Prior art]
A conventional generator excitation control apparatus is configured as follows. That is, in the case of the thyristor excitation method, the generator G has an automatic voltage adjustment device AVR (hereinafter simply referred to as AVR) shown in FIG. 9 or an excitation amount (field current or field voltage) adjustment device shown in FIG. The MEC (hereinafter simply referred to as MEC) is activated to generate a rated voltage.
[0003]
Further, protection against overvoltage or overexcitation of the generator at the time of activation is protected by an overvoltage protection relay OV via VT or a no-load overexcitation protection device OEP (hereinafter simply referred to as OEP).
[0004]
Here, there are generally two methods of voltage establishment for the generator: voltage establishment by AVR activation and voltage establishment by MEC activation.
[0005]
Among these, when AVR is used, it is as follows. As shown in FIG. 9, the AVR compares the voltage Vg detected from the generator output with the generator voltage set value Vs preset by the voltage setter SV, and controls the detected voltage Vg to match the set value Vs. To do. The generator output voltage is detected by a voltage detector DV via VT. In general, in the case of AVR start-up, the voltage setter SV is set to the rated voltage, and the generator voltage rises from the zero state to the rated voltage, and the voltage is established.
[0006]
Specifically, when the field breaker FCB is turned on, the voltage Vg detected from the generator output is compared with the set voltage Vs of the voltage setter SV set to the rated voltage, and the control signal is sent to the thyristor control circuit. C is applied to the thyristor rectifier THY, the amount of excitation (field current or field voltage) of the field F of the generator G is controlled, and the output voltage of the generator G rises to the rated voltage.
[0007]
Next, when MEC is used, it is as follows. As shown in FIG. 10, the MEC compares the excitation amount (field voltage or field current) with a preset value set in advance by the excitation amount setter SE, and adjusts the difference to thereby adjust the field of the generator G. Control the amount of F excitation. The excitation amount is detected by an excitation amount detector DE. In general, when MEC is activated, the excitation amount setting device SE is set to an excitation amount corresponding to the rated voltage when the generator G is unloaded, and the output voltage of the generator G rises to the rated voltage.
[0008]
Actually, when the field breaker FCB is turned on, the excitation amount is compared with the set value of the excitation amount setting device SE, and a control signal is given from the thyristor control circuit C to the thyristor rectifier THY, and the generator G The excitation amount (field current or field voltage) rises to the set value, and the generator G rises to the rated voltage.
[0009]
[Problems to be solved by the invention]
However, in the AVR activation, the conventional technology may not be activated normally as follows. In other words, when there is an abnormality in the circuit that detects the generator voltage, for example, when the VT is disconnected from the circuit during maintenance and forgotten to recover after the maintenance is completed, or the cable used in the voltage detection circuit is damaged or disconnected In such a case, a correct voltage value cannot be detected. In this case, the AVR cannot perform correct control because it monitors and controls only the voltage of the generator G to be controlled.
[0010]
Specifically, since the AVR has a voltage signal via the VT as a control target, if the circuit is abnormal as described above, the voltage of the generator G is made smaller than the original voltage value or The AVR controls the thyristor rectifier THY to increase the amount of excitation so as to raise the generator voltage to the rated value. As a result, the generator G reaches an overvoltage. At that time, the existing generator overvoltage protection relay OV detects the generator voltage with the same VT as the AVR, and therefore cannot detect the overvoltage of the generator G and cannot protect the generator G. There is a problem.
[0011]
In consideration of such circumstances, a no-load overexcitation protection device OEP may be installed as a countermeasure against the malfunction of the overvoltage protection device when the AVR is started due to an abnormality in the VT input signal. Here, the no-load overexcitation protection device OEP is a device that monitors the amount of excitation of the generator and operates when the value exceeds a set value to stop the generator. Therefore, overvoltage protection of the generator G can be expected even when the voltage detection circuit including VT is abnormal.
[0012]
However, the setting value of the no-load overexcitation protection device OEP is larger than the excitation amount equivalent to the rated voltage at no load of the generator in order to avoid malfunctions such as when the voltage is established at the time of normal startup of the generator G. Must be set to This is because, even in the case of normal generator start-up, the amount of excitation becomes transient compared to the amount of excitation corresponding to the rated voltage when the generator is not loaded, although it is a short time.
[0013]
Therefore, when the no-load overexcitation protection device OEP is activated when the generator voltage is established, the generator G is already overexcited and overvoltage when the OEP is activated, and it takes a short time before the generator G stops. The generator G will be overvoltage operated.
[0014]
On the other hand, in the case of MEC activation, even if there is no abnormality in the voltage detection circuit, if there is an abnormality in the excitation amount detection circuit, the correct operation is not performed. This is because the MEC monitors and controls only the amount of excitation to be controlled. Therefore, if there is an abnormality in the excitation amount detection circuit and correct detection cannot be performed, correct control cannot be performed and startup cannot be performed normally.
[0015]
In this case, protection is performed by the overvoltage protection relay OV. However, like the problem of the no-load overexcitation protection device OEP, the set value of the overvoltage protection relay OV must be set larger than the rated generator voltage. Absent. Therefore, the generator cannot avoid overvoltage operation for a short time until the overvoltage protection relay OV operates and the generator G stops.
[0016]
The present invention has been made in consideration of the above points, and an object of the present invention is to provide an excitation control device for a generator that can be started without over-excitation or overvoltage of the generator.
[0017]
[Means for solving problems]
In order to achieve the above object, in the present invention, the set value of AVR or MEC for controlling the start-up of the generator is decreased only at the start-up, and the output voltage, field voltage or current at that time is monitored. Is determined to be normal startup, and then the generator is operated to the no-load rated voltage. switching An excitation control device for a generator to be transferred is provided.
[0018]
According to claim 1, when the generator is AVR activated, the AVR voltage set value is not set to the generator rated voltage from the beginning, but is set to a value smaller than the rated value, and the generator is generated at that time. After judging whether the generator circuit is normal or not based on the amount of machine field current, the value is valid. Change the output voltage setting value Increase the generator voltage to the rated voltage.
[0019]
As a result, the set value for diagnosing the abnormality is much smaller than the above-described no-load OEP set value, so that it is possible to detect the abnormality and stop the generator before the generator becomes overvoltage.
[0020]
According to claim 2, when the generator is AVR started, the AVR voltage set value is set to a value smaller than the rated value, and the generator circuit is controlled by the amount of the generator field voltage at that time. Determine whether it is normal. And after confirming that the value is reasonable, Change the output voltage setting value Increase the generator voltage to the rated voltage.
[0021]
As a result, the set value for diagnosing the abnormality is much smaller than the above-described no-load OEP set value, so that it is possible to detect the abnormality and stop the generator before the generator becomes overvoltage.
[0022]
According to claim 3, when the generator is MEC activated, the field current set value is set to a value smaller than the field current value corresponding to the rated voltage when the generator is unloaded, and the generator is activated, Whether or not the generator circuit is normal is determined based on the generator voltage value at that time. After confirming that the value is appropriate, set the field current value to the field current value corresponding to the rated voltage when the generator is unloaded. switching Set and raise the generator voltage to the rated voltage.
[0023]
As a result, the set value of the generator voltage for diagnosing the abnormality is much smaller than the set value of the overvoltage protection relay, so that it is possible to detect the abnormality and stop the generator before the generator becomes overvoltage. Become.
[0024]
According to claim 4, when the generator is MEC activated, the field voltage set value is set to a value smaller than the field voltage value corresponding to the rated voltage when the generator is not loaded, and the generator is activated, Whether or not the generator circuit is normal is determined based on the generator voltage value at that time. After confirming that the value is reasonable, set the field voltage value to the field voltage value corresponding to the rated voltage when the generator is not loaded. switching Set and raise the generator voltage to the rated voltage.
[0025]
As a result, the set value of the generator voltage for diagnosing the abnormality is much smaller than the set value of the overvoltage protection relay, so that it is possible to detect the abnormality and stop the generator before the generator becomes overvoltage. Become.
[0026]
According to claim 5, when the generator is MEC started, the field current set value is set to a value smaller than the field current value corresponding to the rated voltage when the generator is not loaded, and the generator is started. Whether or not the circuit is normal is determined based on the generator field voltage value at that time. After confirming that the value is appropriate, set the field current value to the field current value corresponding to the rated voltage when the generator is unloaded. switching Set and raise the generator voltage to the rated voltage.
[0027]
As a result, the set value for diagnosing the abnormality is much smaller than the field voltage value equivalent to the rated voltage when the generator is not loaded. Therefore, before the generator becomes overvoltage, the abnormality is detected and the generator is stopped. It becomes possible to do.
[0028]
According to claim 6, when the generator is MEC started, the field voltage set value is set to a value smaller than the field voltage value corresponding to the rated voltage when the generator is not loaded, and the generator is started. Whether the circuit is normal or not is determined based on the generator field current value. After confirming that the value is reasonable, set the field voltage value to the field voltage value corresponding to the rated voltage when the generator is not loaded. switching Set and raise the generator voltage to the rated voltage.
[0029]
As a result, the set value for diagnosing the abnormality is much smaller than the field current value equivalent to the rated voltage when the generator is not loaded. Therefore, before the generator becomes overvoltage, the abnormality is detected and the generator is stopped. It becomes possible to do.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
The configuration of the embodiment of the present invention is shown in FIGS. 1 to 3, the operation flow is shown in FIG. 4, and the operating characteristics are shown in FIGS. 1 shows the configurations of the first and second embodiments corresponding to the inventions described in claims 1 and 2, and FIG. 2 shows the third and the third configurations corresponding to the inventions described in claims 3 and 4. Each configuration of the fourth embodiment is shown in FIG. 3, and each configuration of the fifth and sixth embodiments corresponding to the inventions described in claims 5 and 6 is shown.
[0031]
FIG. 4 is an operation flowchart common to the first to sixth embodiments. FIG. 5 shows the characteristics during normal operation of the first and second embodiments, and FIG. 6 shows the characteristics during abnormal operation of the first and second embodiments. FIG. 7 shows the characteristics during normal operation of Examples 3 to 6, and FIG. 8 shows the characteristics during abnormal operation of Examples 3 to 6, respectively.
[0032]
FIG. 1 shows the configuration of the first and second embodiments of the present invention, and shows the configuration of a thyristor excitation method using AVR. In the first embodiment, as shown in FIG. 1, the start-up initial voltage setter SS1 for setting the set value of AVR to be smaller than the rated voltage at the no load of the generator, the start-up abnormality when controlled to the initial set value. Is provided with a switching circuit SW for switching the AVR set value to a set value equivalent to the rated voltage when the generator is not loaded when no start abnormality is detected.
[0033]
As a result, the output voltage of the generator G detected by the instrument transformer VT and the voltage detector DV is controlled so as to coincide with the voltage set by the start-up initial voltage setter SS1 provided via the switching circuit SW. To do.
[0034]
If it can be confirmed that the start-up is normal, the output voltage of the generator G is compared with the set voltage (no-load rated voltage) of the voltage setter SV by switching the switching circuit SW, and power generation is performed so that the two match. Control the output voltage of machine G.
[0035]
FIG. 2 shows the configuration of the third and fourth embodiments of the present invention, and shows the configuration of a thyristor excitation method using MEC. In the third and fourth embodiments, the amount of excitation of the generator G is used instead of the output voltage of the generator G in the first and second embodiments, and the startup is started instead of the initial voltage at startup. Use the initial excitation amount. An excitation amount setting device SE is used instead of the voltage setting device SV.
[0036]
As a result, the start control of the generator G can be performed in the same manner as the control performed based on the generator voltage in the first and second embodiments with the excitation amount as a reference. In this case, the start abnormality is performed by monitoring the detected voltage of the VT, and the output of the VT is given to the start abnormality determining device JS1.
[0037]
FIG. 3 shows the fifth and sixth embodiments of the present invention and shows the structure of the thyristor excitation method using the MEC, which is quite similar to the third and fourth embodiments. Have. However, the detection of the start abnormality is determined by the amount of excitation, and the start abnormality determination circuit JS2 is connected to the field circuit of the generator G.
[0038]
FIG. 4 is a start-up flowchart common to the first to sixth embodiments of the present invention, showing the operation when starting the generator. According to the present invention, basically, whether it is AVR activation or MEC activation, first, the set value is set to be significantly smaller than the rated voltage equivalent value of the generator (S1), and the set value is reached by starting. At the time of (S2), it is confirmed whether there is any abnormality by the activation abnormality determination function (S3).
[0039]
If an abnormality is detected (S5), the activation is stopped and the cause is investigated. If no abnormality is detected, the set value is set to a value corresponding to the rated voltage of the generator G (S6), the system is started (S7), and it is confirmed that the voltage has reached the generator rated voltage (S8). The voltage establishment is completed (S9).
[0040]
FIG. 5 shows the time characteristics of the generator voltage and excitation amount at the time of normal start by AVR, and FIG. 6 shows the time characteristics of the generator voltage and excitation amount at the time of abnormal start by AVR. It is.
[0041]
The operation of the first embodiment in which the field current is monitored by the AVR activation method and the second embodiment in which the field voltage is monitored by the AVR activation method will be described with reference to FIGS.
[0042]
(Operation of the first embodiment)
In the first embodiment, in the case of normal startup, the generator voltage rises to the AVR set value as shown in FIG. When the generator voltage reaches the shaded area A in FIG. 5A, the AVR set value is reached. On the other hand, the field current amount (expressed as an excitation amount for convenience in FIGS. 5 and 6) is a field current amount abnormal region (FIG. 5B, hatched region) as shown in FIG. 5B. It rises to the generator current set value equivalent field current amount without reaching B).
[0043]
For this reason, the generator start abnormality is not detected, the voltage setting value of AVR is switched to the rated voltage of the generator, and the generator rises to the rated voltage.
[0044]
On the other hand, in the case of abnormal startup (that is, when there is an abnormality in the voltage detection circuit, such as when the VT of the detection circuit has not been recovered from the circuit), as shown in FIG. Therefore, the AVR attempts to increase the generator voltage to the AVR voltage set value by increasing the field current amount.
[0045]
At that time, before the generator voltage reaches the AVR voltage set value (FIG. 6 (a), hatched area A), the field current amount reaches the abnormal area (FIG. 6 (b), hatched area B). A startup abnormality is detected and the generator is stopped.
[0046]
As described above, when the AVR voltage set value is started in a state significantly smaller than the generator rated voltage and the abnormal state is determined, the field current amount abnormality determination value can be set smaller than the field current amount at the generator rated voltage. An abnormality can be detected without causing the generator to overvoltage even for a moment. For this reason, the generator can be stopped without damaging the generator even when the generator is abnormally started.
[0047]
(Operation of the second embodiment)
In the second embodiment, in the case of normal startup, the generator voltage rises to the AVR voltage set value as shown in FIG. When the generator voltage reaches the shaded area A in FIG. 5A, the AVR voltage set value is reached. On the other hand, the field voltage amount (represented as the excitation amount in FIG. 5 and FIG. 6 for the sake of convenience) is, as shown in FIG. 5B, the field voltage amount abnormal region (FIG. 5B, diagonal line). It rises to the generator voltage set value equivalent field voltage amount without reaching region B). For this reason, the generator start abnormality is not detected, the generator voltage setting value of AVR is switched to the generator rated voltage, and the generator rises to the rated voltage.
[0048]
On the other hand, in the case of abnormal startup (that is, when there is an abnormality in the voltage detection circuit, such as when the VT of the detection circuit has not been recovered from the circuit), an increase in the generator voltage is not detected, or Since AVR is detected to be smaller than the actual voltage, AVR attempts to increase the generator voltage to the AVR voltage set value by increasing the field voltage amount.
[0049]
At that time, before the generator voltage reaches the AVR voltage set value (FIG. 6 (a), hatched area A), the field voltage amount reaches the abnormal area (FIG. 6 (b), hatched area B). An abnormal voltage establishment error is detected and the generator is stopped.
[0050]
Thus, when the AVR voltage set value is started in a state that is significantly smaller than the generator rated voltage and the abnormal state is determined, the field voltage amount abnormality determination value is set smaller than the field voltage amount at the generator rated voltage. It is possible to detect an abnormality without causing the generator to overvoltage even for a moment. For this reason, the generator can be prevented from being damaged due to a circuit abnormality at the time of voltage establishment.
[0051]
(Operation of the third to sixth embodiments)
The third to sixth embodiments operate as shown in FIGS. FIG. 7 shows the startup characteristics when MEC is normally started, and FIG. 8 shows the startup characteristics when MEC is abnormally started.
[0052]
7 and 8, a third embodiment in which the field current set value is adjusted by using the MEC to monitor the generator output voltage, and the generator output voltage is adjusted by adjusting the field voltage set value by using the MEC. A fourth embodiment for monitoring, a fifth embodiment for monitoring the generator field voltage by adjusting the field current set value using the MEC, and a generator for adjusting the field voltage set value using the MEC The operation of the sixth embodiment for monitoring the field current value will be described.
[0053]
(Operation of the third embodiment)
In the case of normal startup, as shown in FIG. 7, the generator field current rises to the MEC set value (in FIG. 7A and FIG. 8A, it is expressed as an excitation amount for convenience). When the generator field current reaches the hatched area A in FIG. 7A, the MEC set value is reached. On the other hand, as shown in FIG. 7B, the generator voltage amount (expressed as an abnormal activation determination amount for convenience in FIGS. 7B and 8B) It rises to the generator voltage amount equivalent to the MEC set value without reaching FIG. 7 (b), the shaded area B).
[0054]
For this reason, the generator start abnormality is not detected, and the generator shifts to the MEC no-load field current set value corresponding to the generator rated voltage, and the generator rises to the rated voltage.
[0055]
When there is an abnormality in the generator excitation amount detection circuit, the increase in the generator field current is not detected or is detected to be smaller than the actual value. Therefore, the MEC increases the field current amount to the MEC set value. Try to increase the magnetic current. At that time, before the generator field current reaches the MEC set value (FIG. 8 (a), hatched area A), the generator voltage amount reaches the abnormal area (FIG. 8 (b), hatched area B). A generator start abnormality is detected and the generator is stopped.
[0056]
As described above, when the MEC field current set value is started in a state that is significantly smaller than the field current corresponding to the rated voltage when the generator is not loaded and an abnormal state is determined, the generator voltage abnormality determination value is set to the generator rating. It can be set smaller than the voltage value, and an abnormality can be detected without causing the generator to overvoltage even for a moment. For this reason, the generator can be prevented from being damaged due to a circuit abnormality at the time of voltage establishment.
[0057]
(Operation of the fourth embodiment)
In the case of normal startup in the fourth embodiment, as shown in FIG. 7, the generator field voltage rises to the MEC set value (in FIGS. 7A and 8A, for the sake of convenience, the excitation amount and Expressed). When the generator no-load field voltage reaches the shaded area A in FIG. 7A, the MEC set value is reached. On the other hand, the generator voltage amount (in FIG. 7 (b) and FIG. 8 (b)) is expressed as an abnormal activation determination amount for convenience) as shown in FIG. b) Since it rises to the MEC set value equivalent generator voltage amount without reaching the shaded area B), the generator start abnormality is not detected, and the MEC field voltage set value is the value when the generator is unloaded. The value is switched to a value equivalent to the rated voltage, and the generator rises to the rated voltage.
[0058]
If there is an abnormality in the generator excitation amount detection circuit, the increase in the generator field voltage is not detected or is detected to be smaller than the actual value, so the MEC increases the field voltage amount to the MEC set value. Try to increase the field voltage. At that time, before the field voltage reaches the MEC set value (FIG. 8 (a), hatched area A), the generator voltage amount reaches the abnormal area (FIG. 8 (b), hatched area B). A startup abnormality is detected and the generator is stopped.
[0059]
Thus, when the MEC field voltage set value is started in a state that is significantly smaller than the field voltage value corresponding to the rated voltage when the generator is not loaded and an abnormal state is determined, the generator voltage abnormality determination value is set to the generator rating. It can be set smaller than the voltage value, and an abnormality can be detected without causing the generator to overvoltage even for a moment. For this reason, the generator can be prevented from being damaged due to a circuit abnormality at the time of voltage establishment.
[0060]
(Operation of the fifth embodiment)
In the fifth embodiment, in the case of normal startup, as shown in FIG. 7A, the generator field current rises to the MEC set value (in FIG. 7A and FIG. 8A, for convenience, It is expressed as the amount of excitation). When the generator field current reaches the shaded area A in FIG. 7A, the MEC set value is reached. On the other hand, the generator field voltage amount (in FIG. 7B and FIG. 8B, expressed for the sake of convenience as an abnormal start determination amount) is the generator field voltage as shown in FIG. 7B. It rises to the generator field voltage amount corresponding to the MEC set value without reaching the abnormal region (FIG. 7B, hatched region B).
[0061]
For this reason, the generator start abnormality is not detected, the MEC field current set value is switched to a value corresponding to the rated voltage when the generator is not loaded, and the output voltage of the generator rises to the rated voltage.
[0062]
When there is an abnormality in the excitation amount detection circuit, since the increase in the generator field current is not detected or is detected smaller than the actual value, the MEC increases the field current amount to the MEC set value. Try to raise. At that time, before the generator field current reaches the MEC set value (FIG. 8A, hatched area A), the generator field voltage amount is changed to the abnormal area (FIG. 8B, hatched area B). And the generator start abnormality is detected and the generator is stopped.
[0063]
As described above, when the MEC field current set value is started with the field current value corresponding to the rated voltage when the generator is unloaded being significantly smaller and the abnormal state is determined, the generator field voltage abnormality determination value is generated. It can be set smaller than the rated voltage equivalent field voltage value when the machine is not loaded, and an abnormality can be detected without making the generator overvoltage even for a moment. For this reason, the generator can be prevented from being damaged due to a circuit abnormality at the time of voltage establishment.
[0064]
(Operation of the sixth embodiment)
In the sixth embodiment, in the case of normal startup, the generator field voltage rises to the MEC set value as shown in FIG. 7 (in FIG. 7A and FIG. Expressed). When the generator field voltage reaches the hatched area A in FIG. 7A, the MEC set value is reached. On the other hand, the generator field current amount (in FIG. 7 (b) and FIG. 8 (b), expressed for the sake of convenience as an abnormal activation determination amount) is an abnormal generator field current as shown in FIG. 7 (b). Since the generator field current amount corresponding to the MEC set value is reached without reaching the region (FIG. 7 (b), hatched region B), the generator start abnormality is not detected, and the MEC set value is the value when the generator is not loaded. Switching to a set value equivalent to the rated voltage causes the generator to rise to the rated voltage.
[0065]
If there is an abnormality in the excitation amount detection circuit, an increase in the generator field voltage is not detected or is detected to be smaller than the actual value. Therefore, the MEC increases the field voltage amount to the MEC set value. Try to increase the voltage. At that time, before the generator field voltage reaches the MEC set value (FIG. 8A, hatched area A), the generator field current amount reaches the abnormal area (FIG. 8B, hatched area B). When the generator start abnormality is detected, the generator is stopped.
[0066]
As described above, when the MEC field voltage set value is started with the field voltage value substantially smaller than the rated voltage when the generator is unloaded and the abnormal state is determined, the generator field current abnormality determination value is generated. It can be set smaller than the rated voltage equivalent field current value when the machine is not loaded, and an abnormality can be detected without making the generator overvoltage even for a moment. For this reason, the generator can be prevented from being damaged due to a circuit abnormality at the time of voltage establishment.
[0067]
In these embodiments, in order to avoid overexcitation and overvoltage of the generator, it is necessary to detect the start-up abnormality as quickly as possible. It is desirable to make it much smaller than the equivalent value of the rated voltage.
[0068]
(Modification)
In the first to sixth embodiments, the thyristor excitation method is illustrated, but the present invention can also be applied to a brushless excitation method.
[0069]
Further, the present invention determines an abnormality in a sufficiently low generator voltage state where the generator does not become an overvoltage, and can also be applied to a configuration in which the AVR voltage set value or the MEC set value increases stepwise. .
[0070]
【The invention's effect】
As described above, according to the present invention, the AVR or MEC control set value for controlling the start-up of the generator is reduced only at the start-up, and the output voltage of the generator or the field voltage and current at that time are monitored. Therefore, it is possible to provide an excitation control device for a generator capable of starting without overexcitation or overvoltage of the generator because it is determined that no abnormal start has occurred and the normal operation is started. it can.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of the present invention in which activation control is performed using AVR.
FIG. 2 is a block diagram showing another embodiment of the present invention in which activation control is performed using an MEC.
FIG. 3 is a block diagram showing still another embodiment of the present invention in which activation control is performed using an MEC.
FIG. 4 is a start-up flowchart when starting up a generator using the present invention.
FIG. 5A is a diagram showing a time characteristic of a generator voltage at the time of normal startup by AVR control, and FIG. 5B is a diagram showing a time characteristic of an excitation amount at the time of normal startup by AVR control.
6A is a diagram showing a time characteristic of a generator voltage at the time of abnormal start by AVR control, and FIG. 6B is a diagram showing a time characteristic of an excitation amount at the time of abnormal start by AVR control.
7A is a diagram showing a time characteristic of an excitation amount at the time of normal activation by MEC control, and FIG. 7B is a diagram showing a time characteristic of an abnormal activation determination amount at the time of normal activation by MEC control.
FIG. 8A is a diagram showing a time characteristic of an excitation amount at the time of abnormal activation by MEC control, and FIG. 8B is a diagram showing a time characteristic of an abnormal activation determination amount at the time of abnormal activation by MEC control.
FIG. 9 is a diagram showing a configuration of a general thyristor control method using conventional AVR.
FIG. 10 is a diagram showing a configuration of a general thyristor control method using a conventional MEC.

Claims (6)

In the generator excitation control device that performs start-up control based on the output voltage of the generator,
A voltage setting device for setting an output voltage setting value of the generator;
The output voltage set value of the generator and the start time of the initial voltage setting unit for setting lower than the rated voltage of the generator during starting,
Field current detection means for detecting the field current of the generator;
The field current value detected by the field current detection means at the time of start-up is set by the start-up initial voltage setter set by the start-up initial voltage setter, but is determined based on the output voltage set value. An activation abnormality determination device for determining an activation abnormality when a magnetic current abnormality determination value is exceeded ;
A generator excitation control device comprising switching means for switching the output voltage set value to a value set by the voltage setter when the start abnormality determining device does not determine a start abnormality . In the generator excitation control device that performs start-up control based on the output voltage of the generator,
A voltage setting device for setting an output voltage setting value of the generator;
An initial voltage setter at start- up that sets the output voltage set value of the generator lower than the rated voltage of the generator at start-up ;
A field voltage detecting means for detecting a field voltage of the generator;
Activated when the field voltage value detected by the field voltage detecting means at the time of activation exceeds a predetermined field voltage abnormality determination value set by the initial voltage setting device at the time of activation and based on the output voltage setting value An activation abnormality determination device for determining abnormality ;
A generator excitation control device comprising switching means for switching the output voltage set value to a value set by the voltage setter when the start abnormality determining device does not determine a start abnormality . In the generator excitation control device that controls the start-up of the generator based on the excitation amount,
An excitation amount setting device for setting a field current setting value of the generator;
An excitation amount initial value setter that sets the field current setting value of the generator lower than the rated voltage equivalent field current value of the generator at the time of startup ;
Output voltage detecting means for detecting the output voltage of the generator;
Start abnormality is determined when the output voltage detected by the output voltage detection means at the start exceeds a predetermined output voltage abnormality determination value based on the field current set value set by the excitation amount initial value setter A startup abnormality determination device to
An excitation control device for a generator , comprising switching means for switching the field current set value to a value set by the excitation amount setter when the start abnormality determining device does not determine a start abnormality . In the generator excitation control device that controls the start-up of the generator based on the excitation amount,
An excitation amount setting device for setting a field current setting value of the generator;
The field voltage set value of the generator and the amount of excitation setter to set lower than the rated voltage corresponding field voltage value of the generator during starting,
Output voltage detecting means for detecting the output voltage of the generator;
Start abnormality is determined when the output voltage detected by the output voltage detection means at start-up exceeds a predetermined output voltage abnormality determination value based on the field voltage set value set by the initial excitation amount setter A startup abnormality determination device to
An excitation control device for a generator , comprising switching means for switching the field current set value to a value set by the excitation amount setter when the start abnormality determining device does not determine a start abnormality . In the generator excitation control device that controls the start-up of the generator based on the excitation amount,
An excitation amount setting device for setting a field current setting value of the generator;
An excitation amount setting device for setting a field current set value of the generator lower than a rated voltage equivalent field current value of the generator at the time of startup ;
A field voltage detecting means for detecting a field voltage of the generator;
Field voltage the detected that the field voltage detecting means during startup, activated when the excitation amount initial value setting unit exceeds the field voltage abnormality determination value set in advance based on the field current setting value set An activation abnormality determination device for determining abnormality;
An excitation control device for a generator , comprising switching means for switching the field current set value to a value set by the excitation amount setter when the start abnormality determining device does not determine a start abnormality . In the generator excitation control device that controls the start-up of the generator based on the excitation amount,
An excitation amount setting device for setting a field current setting value of the generator;
An excitation amount setting device for setting a field voltage setting value of the generator lower than a rated voltage equivalent field voltage value of the generator at the time of startup ;
Field current detection means for detecting the field current of the generator;
Field current the field current detecting means detects at startup, start if it exceeds the amount of excitation of the initial value the field voltage setting predetermined field current abnormality determination value based on value setter has set An activation abnormality determination device for determining abnormality;
An excitation control device for a generator , comprising switching means for switching the field current set value to a value set by the excitation amount setter when the start abnormality determining device does not determine a start abnormality .

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