JPH02269498A - Controlling of generator - Google Patents

Abstract

PURPOSE:To effectively operate a turbo generator and a shaft generator by detecting variation in an input vapor amount by a pressure signal oscillator, comparing the pressure signal with a set pressure to obtain a deviation, automatically altering the set value of a governor in response to the deviation, and subsequently automatically altering the opening of a vapor amount control valve. CONSTITUTION:When an output of a main engine 1 is raised, vapor amount is increased, a pressure detection signal is compared with a set pressure to automatically obtain a deviation signal. This deviation signal automatically raises the set value of a governor 18 to increase the opening of a vapor amount control valve 16, and the output and frequency of a turbo generator 19 are raised as compared with reference values. The frequency is automatically detected to so control it as to reduce the output of a shaft generator 21. Then, the sharing power of the generator 19 is increased, and the sharing power of the generator 21 is decreased. Here, in the case of the deviation in which the vapor pressure is higher than the set pressure, marginal power is supplied to the generator 21 if the generator 19 has room for load.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a turbo generator driven by steam generated in an exhaust gas economizer that uses exhaust gas from a ship's main engine as a heat source, and a shaft driven by the main engine. The present invention relates to a method for controlling a generator in a power generation device having a generator.

[Conventional technology]

Conventionally, the power required during a ship's normal voyage cannot be provided solely by the power of the turbo generator, which is driven by the steam generated by the exhaust gas economizer, which uses the exhaust gas from the main engine as a heat source, so the shaft driven by the main engine has been used. Generators are operated in parallel to compensate for power shortages.

That is, in the conventional power generation device of this type, for example, the third
It consists of the configuration shown in the figure.

In Figure 3, 1 is the ship's main engine (diesel engine), 2
3 is an exhaust gas pipe, 3 is an exhaust gas economizer that uses the exhaust gas from the main engine 1 as a heat source, 4 is a superheater built into the exhaust gas economizer 3, 5 is an evaporator, 6 is a boiler water drum, and 7 is a brackish water Drum, 8 is water pump, 9
10 is a circulation pump, 10 is a steam pipe, 11 is a steam supply pipe to a customer, 12 is a steam pressure detector, and 13 is a steam valve.

14 is a dump steam pipe, 15 is a steam pipe, 16 is a steam amount control valve, 17 is a steam turbine, 18 is the steam turbine 170
a governor that controls the opening degree of the steam amount control valve 16 according to the rotational speed; 19 a turbo generator driven by the steam turbine 17; 20 a propeller shaft of the ship; 21 a shaft generator driven by the main engine 1; 22 is a propeller, 23 is a converter that converts AC power of a certain frequency generated by the shaft generator 21 into DC power, 24 is an inverter that converts the DC power into AC power at a bus frequency, and 25 is a diesel generator. , 26 is its governor, 27 is the bus bar of the main switchboard,
28 is a load sharing device.

Here, as is well known, exhaust gas economizer 3 during voyage
Since the amount of steam generated at the turbo generator 19 changes depending on the output of the main engine 1, etc., it is necessary to share the load so that as much of the steam available from the turbo generator 19 as possible is converted into electric power.
Conventionally, the method has been to manually set load sharing by setting a steam volume smaller than the lower limit as the usable steam volume of the turbo generator 19 in response to fluctuations in steam volume. , and secondly, the steam turbine 17 is operated with the steam amount control valve 16 fully open, and the steam turbine 17 is
A method has been adopted in which the load sharing of the shaft generators 21 operating in parallel is manually adjusted by utilizing the fact that the output of the turbo generator 19 fluctuates due to an increase or decrease in the amount of steam flowing into the shaft generator 21 .

[Problem to be solved by the invention]

However, all of the above-mentioned conventional methods are manual, and it is very difficult to follow fluctuations in the amount of steam.Especially in the first method, there is a problem that excess steam is wasted. There is a point.

The present invention attempts to solve these problems. That is, the present invention.

It is an object of the present invention to provide a method for controlling a generator, which enables the most effective operation of a turbo generator and a shaft generator by automatic operation that follows fluctuations in the amount of steam.

[Means to solve the problem]

In order to achieve the above object, the generator control method of the present invention includes an exhaust gas economizer whose heat source is exhaust gas from the main engine of a ship, a steam turbine driven by the steam from the exhaust gas economizer, and a steam turbine driven by the steam turbine. A turbo generator to be driven, a shaft generator driven by the main engine, a steam amount control valve provided at the steam inlet of the steam turbine, and an opening degree of the steam amount control valve according to the rotational speed of the steam turbine. In the power generation device having a governor for controlling the steam turbine, a pressure signal transmitter is provided that transmits a signal corresponding to the inlet steam pressure of the steam turbine, and a deviation between the pressure detection signal from the pressure signal transmitter and the set pressure is determined. ,
By changing the set value of the governor according to the deviation, the load shared by the turbo generator is automatically changed, and the turbo generator is thereby changed. The output of the shaft generator is automatically controlled according to the fluctuation signal of the frequency of the turbo generator, thereby automatically returning the frequency of the turbo generator to the original reference frequency.

[For production]

According to the present invention, since a pressure signal transmitter is provided that transmits a signal according to the inlet steam pressure of the steam turbine,
Fluctuations in the amount of steam at the inlet of the steam turbine are detected as fluctuations in steam pressure by the pressure signal transmitter, and a pressure detection signal corresponding to this fluctuation is transmitted. This pressure detection signal is compared with the set pressure by the controller to determine the deviation.

Then, the set value of the governor is automatically changed according to the deviation, and the opening degree of the steam flow control valve is also automatically changed, thereby sharing the frequency of the turbo generator and the turbo generator. The current load changes depending on the deviation. The output of the shaft generator is automatically controlled according to this frequency fluctuation signal. As a result of this, the frequency of the turbo generator is returned to the original reference frequency.

〔Example〕

FIG. 1 shows an example of an apparatus for carrying out the method of the invention.

In FIG. 1, numerals 1 to 28 are the same as in FIG. 29 is a pressure signal transmitter, and the steam pipe 1
5, that is, the inlet pressure of the steam turbine 17, and transmits a pressure signal according to the detected pressure. Further, 30 is a controller to be described later, and 31 is an arrow indicating that a set pressure is input to the controller 30.

As is well known, when the output of the main engine 1 increases, the amount of steam from the exhaust gas economizer 3 increases, and the steam pressure increases. Conversely, when the output of the main engine 1 decreases, the amount of steam from the exhaust gas economizer 5 decreases, and the steam pressure decreases.

Therefore, the pressure signal transmitter 29 detects fluctuations in the amount of steam at the inlet of the steam turbine 17 as fluctuations in the steam pressure,
A signal corresponding to the steam pressure can be obtained. The pressure detection signal is then input to the controller 30, compared with the set pressure, and the pressure deviation is automatically determined.

Here, if there is no deviation, it is determined that the reference state is reached, and the turbo generator 19 is driven by the steam turbine 17 operated with the same steam pressure, and the shaft generator 21
The main engine 1 continues to operate as it is.

FIG. 2 shows the shared load (KW) of the turbo generator 19 and the shared load (KW) of the shaft generator 21.

As mentioned above, if the pressure detection signal from the pressure signal transmitter 29 is compared with the set pressure and there is no deviation, it is determined that the reference state is reached. is the turbo generator side governor reference setting value (code 40
The shaft generator 21 is operated at the shaft generator side governor standard setting value (shaded line 50), and the frequency f is the standard cycle (60 cycles).
Therefore, if the inboard load is L (KW), the power burden of the turbo generator 19 is Ao (KW), and the power burden of the shaft generator 21 is a.

(KW), and just L = Ao+a. It is.

However, when the output of the main engine 1 increases, the amount of steam from the exhaust gas economizer 5 increases.

This increase is manifested as an increase in the turbine inlet steam pressure, and a pressure detection signal from the pressure signal transmitter 29 is sent to the controller 30 and compared with the set pressure to signal a deviation that the turbine inlet steam pressure is higher than the set pressure. is automatically obtained.

This deviation signal is sent to the turbo generator side governor motor,
The motor automatically increases the set value of the governor 18 to the diagonal line 41 in FIG. 2 and increases the opening degree of the steam amount control valve 16.

Then, the output and rotational speed of the steam turbine 17 both increase above the reference, and therefore the output and the frequency of the turbokoto electric machine 19 both increase above the reference.

When the frequency increases, it automatically detects this and drives the governor motor on the shaft generator side, automatically lowering the setting value of the governor on the shaft generator side to the diagonal line 51 in Figure 2, and The output of the machine 21 is controlled to decrease.

As a result, the frequency of the turbo generator 19 is automatically returned to the original reference frequency (60 cycles).

Then, the power burden of the turbo generator 19 is A,
(KW), and the power burden on the shaft generator 21 decreases to a. In other words, L = A, +a, and A,
＞Ao, al< al), A, −A0= aQ −
a.

Here, if the steam pressure detected by the pressure signal transmitter 29 has a deviation higher than the set pressure, even if the load share of the turbo generator i9 is set to the full load, if there is a margin, that is, the above-mentioned When A is larger than L, the excess power is supplied to the shaft generator 21, and the shaft generator 21 is operated as an electric motor, so that it is used for part of the rotational force of the propeller shaft 20.

Conversely, when the output of main engine 1 decreases, exhaust gas economizer 3
The amount of steam from the turbine decreases, and this decrease appears as a decrease in the steam pressure at the turbine inlet, so the operation is opposite to that when the turbine inlet increases. That is, in this case, a deviation signal indicating that the turbine inlet steam pressure is lower than the set pressure is automatically obtained, and this deviation signal automatically changes the set value of the turbo generator side governor 18 to the diagonal line 42 in FIG. The opening degree of the steam amount control valve 16 becomes smaller.

Then, both the output and the rotational speed of the steam turbine 17 are lower than the reference, so the output and the frequency of the turbo generator 19 are both lower than the reference.

When the frequency decreases, this is automatically detected, the shaft generator side governor motor is driven, and the shaft generator side governor setting value is automatically increased to diagonal 1i152 in Fig. 2.
Control is performed by increasing the output of the shaft generator 21.

As a result, the frequency of the turbo generator 19 is automatically returned to the original reference frequency (60 cycles).

Then, the power burden on the turbo generator 19 decreases to A, (KW), and the power burden on the shaft generator 21 increases to a. In other words, L=A, +a2, and A, <A6,
a, >ao, Ao-A2 =al-a.

becomes.

In this way, even if there is a fluctuation in the amount of steam at the turbine inlet, it can be automatically followed.

L=A(1+aO =A, -)-a.

=A2+al K can.

During the voyage, the main engine 1 is reversed, decelerated, and the shaft generator 21
If the generated power from the shaft generator 210 cannot be expected due to a failure of the generator, the boiler is started to secure the amount of steam at the turbine inlet, or the diesel generator 25 is started.

〔Effect of the invention〕

As explained above, according to the present invention, the set value of the governor is changed according to the deviation between the set pressure and the pressure detection signal from the pressure signal transmitter that transmits the signal corresponding to the inlet steam pressure of the steam turbine. In addition, the opening degree of the steam flow control valve is automatically changed so that the load shared by the turbo generator is changed.
This automatically controls the output of the shaft generator according to the fluctuation signal of the fluctuating turbogenerator frequency, thereby automatically returning the turbogenerator frequency to the original reference frequency. , main engine output increase/decrease during voyage,
If there is a fluctuation in the amount of steam at the turbine inlet due to a change in steam consumption in a steam turbine other than the steam turbine that drives the turbo generator, this will be automatically followed and the steam generated by the exhaust gas economizer will be transferred to the turbo generator without wasting it. It can be used in Therefore, the turbo generator and shaft generator can be operated most effectively.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing an example of the flow of an apparatus implementing the method of the present invention, Fig. 2 is an explanatory diagram of the turbo generator shared load and shaft generator shared load of the apparatus of Fig. 1, and Fig. 3 FIG. 1 is an explanatory diagram of an example of a conventional technique. 1. Main engine, 5.. Φ exhaust gas economizer, 4.
・Superheater, 5. ・Evaporator, 15. ・Steam pipe, 16.
・Steam amount control valve, 17...Steam turbine, 18. Governor, 19...Turbo generator, 21. Shaft generator, ・Pressure signal transmitter, controller

Claims (1)

[Claims] 1. An exhaust gas economizer that uses exhaust gas from a ship's main engine as a heat source, a steam turbine driven by steam from the exhaust gas economizer, and a turbo generator driven by the steam turbine. a shaft generator driven by the main engine; a steam flow control valve provided at the steam inlet of the steam turbine; and controlling the opening degree of the steam flow control valve in accordance with the rotational speed of the steam turbine. In a power generation device having a governor, a pressure signal transmitter is provided that transmits a signal corresponding to the inlet steam pressure of the steam turbine, and a deviation between a pressure detection signal from the pressure signal transmitter and a set pressure is determined,
By changing the set value of the governor according to the deviation, the opening degree of the steam amount control valve is automatically changed so that the load shared by the turbo generator is changed, and from this the opening degree of the steam amount control valve is changed. It is characterized in that the output of the shaft generator is automatically controlled according to the fluctuation signal of the frequency of the turbo generator, thereby automatically returning the frequency of the turbo generator to the original reference frequency. , how to control a generator. 2. If the steam pressure detected by the pressure signal transmitter has a deviation higher than the set pressure, the load share of the turbo generator is increased, and the load share of the shaft generator becomes smaller by the increased amount. In addition, if the steam pressure detected by the pressure signal transmitter is lower than the set pressure, the load share of the turbo generator is reduced, and the shaft generator is controlled by the reduced amount. 2. The method of controlling a generator according to claim 1, comprising controlling the generator so that the load is shared more. 3. If the steam pressure detected by the pressure signal transmitter has a deviation higher than the set pressure, the shaft generator 2. The method of controlling a generator according to claim 1, further comprising supplying the excess power to the shaft generator, operating the shaft generator as an electric motor, and controlling the shaft generator so that it is used as part of the rotational force of the propeller shaft. 4. Claim 1, 2 or 3, wherein the main engine is a diesel engine.
Method of controlling the generator described. 5. The method for controlling a generator according to claim 1, 2, 3 or 4, wherein the exhaust gas economizer includes an evaporator and a superheater of a boiler.