JPS63242126A - Failure detector of generator - Google Patents

Abstract

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

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention is directed to failure detection of a plurality of generators connected to the same bus bar and each terminal voltage being adjusted to a set value by an automatic voltage regulator. Regarding equipment.

(Conventional technology) Generally, ships use one generator to supply power to all power loads, but in recent years, as the power load on ships has increased, multiple power generators with a relatively small power generation capacity have been installed. As a result, the outputs of these generators are now connected to the same bus bar and supplied to the load.

In this case, by operating only the number of generators corresponding to the power load used on the ship, the generators can be operated efficiently.

On the other hand, if there is a generator that is failing.

Since the generator can be disconnected from the grid and another generator can be used, the safety of the ship can be ensured.

(Problems to be Solved by the Invention) However, conventionally, in order to effectively use a generator in this way, it has been necessary to appropriately detect a malfunctioning generator.

SUMMARY OF THE INVENTION In order to solve the problems of the prior art, it is an object of the present invention to provide a generator failure detection device that can detect a generator in which a failure has occurred.

[Structure of the Invention] (Means for Solving the Problems) The present invention detects the reactive power of each generator, and determines the power generation of each generator based on the polarity relationship between the deviation of the reactive power and the deviation of the bus voltage. This is to detect machine failure.

(Function) As a result, it is possible to reliably detect during operation that a failure has occurred in one generator, so that countermeasures against such abnormality can be appropriately executed.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a failure detection device for a generator according to an embodiment of the present invention. Note that in this embodiment, two generators are connected to the same bus bar.

In the figure, the outputs of generators 1 and 2 are connected to the same bus 3 and supplied to load 4.The terminal voltages of generators 1 and 2 are detected by transformers 5 and 6; Signal Vl
, V2 are fed back to automatic voltage regulators 7, 8 that adjust the terminal voltages of the generators 3, 4 to constant values.

The output current of the generator 1.2 is detected by current transformers 9 and 10, and the current detection signals If and I2 are applied to reactive power detection sections 11 and 12. The voltage of the bus 3 is detected by the transformer 13, and its voltage detection signal v3 is applied to the reactive power detectors 11, 12 and the fault detector 14.

The reactive power detection unit 11.12 receives the input current detection signal I.
t, I2 and the generator l based on the voltage detection signal v3.

2 reactive power is calculated, and the calculation result is converted into a reactive power signal P.
It is output to the failure detection unit 14 as I and P2.

In the fault detection section 14, the voltage detection signal v3 and the reactive power signals PL and P2 are applied to the plus input terminals of the subtracters 15, 16, and 17, respectively.

The negative input terminal of the subtracter 15 receives a setting signal Vr of the voltage setting device 18 which stores the voltage on the bus 3 during steady state.
x is added. Therefore, the subtracter 15 calculates the deviation of the voltage of the bus 3 from the steady state.

A setting signal Prz of a reactive power setting device 19 that stores the reactive power in the generator 1 during steady state is applied to the negative input terminal of the subtracter 16. Therefore, subtractor 1
6 calculates the deviation of the reactive power of the generator 1 from the steady state.

A setting signal Prz of a reactive power setting device 20, which stores the reactive power of the generator 2 in a steady state, is applied to the negative input terminal of the subtracter 17. Therefore, subtractor 1
7 calculates the deviation of the reactive power of the first generator 2 from the steady state.

The subtraction result of the subtracter 15 is applied to the multiplier 21 and the multiplier 22 as a voltage deviation signal Hv. Subtractor 16
The subtraction result is added to the multiplier 21 as the reactive power deviation signal of the generator 1. The subtraction result of the subtracter 17 is
It is added to the multiplier 22 as a reactive power deviation signal H2 of the generator 2.

Therefore, the multiplier 21 multiplies the voltage deviation signal Hv and the reactive power deviation signal old, and the multiplier 22 multiplies the voltage deviation signal Hv by the reactive power deviation signal old.
is multiplied by the reactive power deviation signal H2. Multiplier 21゜22
The multiplication results are added to sign determination units 23 and 24.

When the input signals are of positive polarity, the sign determination units 23 and 24 output fault occurrence signals AI and A2, which indicate that a fault has occurred in the generators 1 and 2, respectively, to the operation of the generators 1 and 2, for example. Output to a device etc. (not shown).

With the above configuration, the automatic voltage regulators 7 and 8 are connected to the generator 1,
The voltage detection signal Vl is set so that the terminal voltage of No. 2 becomes the set value.
, V2, the excitation current of the generator 1.2 is adjusted.

Therefore, for example, as shown in FIG. 2(a), when the terminal voltages of generators 1 and 2 become larger than the set value, automatic voltage regulator 7.8 adjusts the terminal voltage of generator 1.2. Since the excitation current is changed so that it decreases to the set value,
As shown by the solid line in FIG. 2(b), the reactive power of the generator 1.2 becomes smaller.

Further, as shown in FIG. 3(a), when the terminal voltage of the generators 1 and 2 becomes smaller than the set value, the automatic voltage regulator 7.8 sets the terminal voltage of the generators 1 and 2. Since the excitation current is changed so as to increase the value, the reactive power of each generator 1, 2 increases as shown by the solid line in FIG.

However, a problem occurred in the excitation system of generators 1 and 2.

If the voltage adjustment by the automatic voltage regulators 7 and 8 is not performed properly and the terminal voltage of the generator 1.2 becomes higher than the set value, the voltage will change as shown by the dashed line in Fig. 2(b). , the reactive power increases. In addition, if the terminal voltage of generators 1 and 2 becomes smaller than the set value, as shown in Fig. 3 (
As shown by the dashed line in b), the reactive power becomes smaller.

That is, when the terminal voltages of the generators 1 and 2 are rising, the reactive power of the normal generators 1 and 2 decreases, and the reactive power of the generators 1 and 2 that are in trouble increases. Moreover, when the terminal voltage of generators 1 and 2 is small, the reactive power of normal generators 1 and 2 becomes large,
The reactive power of the generators 1 and 2 that are in trouble becomes smaller.

As a result, when the voltage of bus 3 is lower than the set value, generators whose reactive power is larger than in steady state are normal, and generators whose reactive power is smaller than in steady state are faulty. It can be determined that there is.

Similarly, when the voltage of bus 3 is higher than the set value, generators whose reactive power is smaller than in steady state are normal, and generators whose reactive power is larger than in steady state are faulty. It can be determined that it is.

According to the present invention, a fault in the generators 1 and 2 is determined based on the relationship between the voltage of the bus 3 and the reactive power of the generators 1 and 2.

Now, considering the case where both generators 1 and 2 are normal,
When the voltage of bus 3 is smaller than the set value, subtracter 1
The voltage deviation signal Hv outputted from the subtracter 16 and H2 is a negative polarity signal, and the reactive power deviation signals H2 and H2 outputted from the subtracters 16 and 17 are both positive polarity signals. As a result, the calculation result of the 1 multiplier 21.22 has a negative polarity, so that the sign determination section 23.24 does not output the fault occurrence signals AI and A2.

Further, when the voltage of the bus 3 is smaller than the set value, the voltage deviation signal Hv output from the subtracter 15 is a positive polarity signal, and the reactive power deviation signal H2 output from the subtracter 16.17 is Both are negative polarity signals. As a result, the operation results of the 1 multipliers 21 and 22 have negative polarity, so
The sign determination units 23 and 24 do not output failure signals Al and A2.

On the other hand, considering that a failure has occurred in the excitation system of the generator 1, when the voltage of the bus 3 is smaller than the set value, the voltage deviation signal Hv output from the subtractor 15 is a signal of negative polarity, and the subtraction The reactive power deviation signal old outputted from the device 16 is a signal of negative polarity. As a result, the calculation result of the multiplier 21 becomes positive, and the sign determination section 23 outputs the fault occurrence signal A1.

Further, when the voltage of the bus 3 is larger than the set value, the voltage deviation signal Hv output from the subtracter 15 is a positive polarity signal, and the reactive power deviation signal Hv output from the subtracter 16 is a positive polarity signal. It is. As a result, the calculation result of the multiplier 21 becomes positive, and the sign determination section 23 outputs the fault occurrence signal A1.

Note that in this case as well, for the generator 2, the calculation result of the multiplier 22 has a negative polarity at any time as described above, so the sign determination unit 24 does not output the fault occurrence signal A2.

As described above, a failure of one generator is detected.

Further, when a failure in a generator is detected in this manner, the occurrence of the failure is displayed to the operator, and the generator operating device is configured to stop the generator in which the failure has occurred.

In addition, in the embodiment mentioned above, the case where two generators are connected to the bus bar is explained.

The present invention can also be applied when three or more generators are connected to a bus bar.

[Effects of the Invention] As explained above, according to the present invention, the reactive power of each generator is detected, and the polarity of the deviation of the reactive power and the deviation of the bus voltage is used to detect the reactive power of each generator. Since a fault can be detected and the occurrence of a fault in the generator can be reliably detected during operation, it is possible to appropriately take measures against such an abnormality.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a device according to an embodiment of the present invention, FIGS. 2(a) and (b) are waveform diagrams showing an example of the relationship between voltage changes and reactive power changes, and FIG. 3(a) ). (b) is a waveform diagram showing another example of the relationship between voltage change and reactive power change. 9.10...Current transformer, 11.12...Reactive power detection unit, 13...Transformer, 14...Fault detection unit, 15~
17... Subtractor, 18... Voltage setting device, 19.2
0...Reactive power setting device. 21.22... Multiplier, 23.24... Sign determination unit.

Claims (1)

[Claims] A failure detection device for a plurality of generators connected to the same bus bar, each terminal voltage being adjusted to a set value by an automatic voltage regulator, comprising a reactive power detection means for detecting reactive power of each generator, and a voltage of the bus bar. a reactive power deviation calculation means for calculating the deviation of the detected value of the reactive power detecting means from a steady state; and a voltage deviation calculating means for calculating the deviation of the detected value of the voltage detecting means from a steady state. A calculation means multiplies the calculation result of the reactive power deviation calculation means and the calculation result of the voltage deviation calculation means for each generator, and the multiplication result indicates that an abnormality has occurred in the generator whose polarity is positive. A failure detection device for a generator, characterized in that it is provided with a determining means for determining.