JPS62155800A - Gas-turbine power generation equipment - Google Patents

Abstract

PURPOSE:To reduce the capacity of an auxiliary battery by using the auxiliary battery as a power supply for making field currents flow only at the time of the starting of a high-frequency generator. CONSTITUTION:When starting a high-frequency generator 12, contacts for relays 28, 30 are changed over to the 28b, 30b sides by a power selecting circuit connected to an auxiliary battery 22 first, and the voltage of the auxiliary battery 22 is applied to a field coil 20. After a desired time passes, the contacts for the relays 28, 30 are changed over to the 28a, 30a sides by the power selecting circuit, and output voltage from a rectifier 14 is applied to the field coil 20 through a field controller 26. Output voltage from the rectifier 14 is stepped down by a battery charger 24 and applied to the auxiliary battery 22 at normal state, and charging is conducted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a gas turbine power generation device, and particularly to a gas turbine power generation device in which a power source for supplying current to a field coil of a high frequency generator is improved. It is.

[Prior Art] A gas turbine power generation device has been proposed in which a gas turbine engine obtains a high-speed constant rotational motion, and this high-speed constant rotation rotates a high-frequency generator to perform a desired power generation action. The value of its use as a backup power source in areas where power is unavailable or during power outages has increased significantly in recent years.

Usually, in this type of gas turbine power generation device, the fourth
As shown in the figure, the electric power extracted by the high-frequency generator 12 directly connected to the gas turbine engine 10 is first transferred to the rectifier 14.
It is converted to DC power by the smoothing capacitor 1
After the power is smoothed by the inverter 18, it is again converted into desired commercial frequency or other alternating current power to operate various electrical devices.

In such a power generation device, the field coil 20 of the high frequency valve N machine
An auxiliary battery 22 provided within the power generation device supplies current to the generator, and a battery chiller 24 charges the auxiliary battery 22. That is,
First, the output voltage of the rectifier 14 is charged to the battery r24.
(DC/DC converter) lowers the voltage to the auxiliary battery 2.
Charge 2. Using this auxiliary battery 22 as a power source, the field controller 26 controls the output voltage VD of the rectifier 14.
A field current is passed through the field coil 20 so that C remains constant.

[Problems to be Solved by the Invention] However, in the conventional device described above, the field current is supplied to the field coil 20 using the auxiliary battery 22 as the only power source.

Therefore, in addition to supplying current to the other auxiliaries, the battery 22 must also supply field current, which requires a larger power valve than those auxiliaries, so the capacity of the battery charger 24 is limited only to that power valve. Therefore, the battery charger 24 becomes large, resulting in an increase in weight and a decrease in efficiency.

The present invention has been made in view of the above-mentioned problems with conventional devices, and its object is to provide a gas turbine power generation device that is smaller and lighter by reducing the capacity of the battery chiller.

[Means for Solving the Problems] In order to achieve the above object, the present invention uses an auxiliary battery as a power source for applying voltage to the field coil of a high-frequency generator only at the time of starting the generator, and thereafter is characterized in that the output of a rectifier that rectifies the output of the generator is used as a power source for supplying field current, and that a switch is provided to switch between these power sources.

[Function] By configuring as described above, first, when the high-frequency generator is started, the output voltage VDC of the rectifier is not generated, so the switching device is activated and connected to the auxiliary battery power supply side, and the field coil is switched on. A voltage is applied to the rectifier using the auxiliary battery as a power source, and the generated rectifier output is smoothed by a smoothing capacitor.

Next, the switch switches to the rectifier output power source, and the output voltage VDC of the high frequency generator is set to a predetermined value V. Until it reaches 1, a field current is passed using the power charged in the smoothing capacitor, and VDC becomes V. When the voltage becomes 1, the field current is caused to flow directly by the output of the rectifier, and from then on, voltage is continued to be applied to the field coil using only the output of the rectifier as a power source.

As a result, the auxiliary battery only needs to be used as a power source to flow the field current when starting the high-frequency generator.
Its capacity can be reduced. Therefore, this trap can also reduce the capacity of the battery chiller that charges the battery, making it possible to reduce the size and weight of the battery charger, which requires a large volume compared to other components. , the effect of improving the efficiency of the power generation unit can be obtained.

[Example] FIG. 1 is an overall configuration diagram of a preferred practical example of the present invention.

The gas turbine engine 10 consists of an engine that rotates at a constant high speed, and in the embodiment, for example, 86, OOORP
It has a rotational speed of M.

A high frequency power generator 12 is directly connected to the gas turbine engine 10, and the high frequency power output from the high frequency power generator 12 is converted into DC power by a high frequency rectifier 14 including six rectifying elements.

A smoothing capacitor 16 is connected to the output of the rectifier 14, and the smoothed DC power is transferred to an inverter 18.
is supplied to the load from In the embodiment, the inverter 18 is constructed by combining well-known inverter elements consisting of a combination of a transistor, a gate control circuit, and a diode, and by controlling the gate of each transistor at a desired timing, the DC current of the rectifier 14 is adjusted to a desired level. For example, it is supplied to a load as AC power at a commercial frequency.

The high frequency power source 12 is constructed of a field coil type and is provided with a field coil 20. This field coil 2
The output of the generator 12 is controlled by controlling the field current '20 supplied to the generator 12.

Application of voltage to the field coil 20 is performed by two power sources: the auxiliary battery 22 and the output of the rectifier 14. The auxiliary battery 22 is connected to the output end of the rectifier 14 via a battery charger 24 (DC/DC converter), and the battery charger 24 steps down the output voltage of the rectifier 14 to charge the auxiliary battery 22 . The output terminal of the auxiliary battery 22 is connected to the field coil 20 via a relay 28, 30 serving as a switch.

The output of the other power source, rectifier 14, is connected to field coil 20 via field controller 26 and relays 28,30.

Switching of the relays 28 , 30 is performed by an excitation coil 32 controlled by the field controller 26 .

In the operation of this embodiment, first, after the gas turbine engine 10 is set to the rated rotation, the high frequency power generation unit 12 is started.
At this time, since the field current '20 has not yet flowed, the output voltage of the high frequency generator 12 is not generated. therefore,
Since the output of the rectifier 14 cannot be used as a power source to flow the field current '20, when the high frequency generator 12 is started, the auxiliary battery 22 is used as a power source to flow the field current '20.

FIG. 2 shows the internal configuration of the field controller 26 connected to the output end of the rectifier 14, and shows the internal configuration of the field controller 26 connected to the output end of the rectifier 14.
At the time of starting, first, a current is applied to the excitation coil 36 by the power supply selection circuit 34 connected to the auxiliary battery 22.
36 and turns on the relay contact 38. This results in
The excitation coil 32 (see Figure 1) is energized, and the relay 28
．． The contacts 30 are switched to the 28b and 30b sides, and the auxiliary battery 22 and the field coil 20 are brought into conduction.

As a result, the voltage of the auxiliary battery 22 increases to the field coil 20.
is applied, and a field current '20 flows. At this time, the full voltage of the auxiliary battery 22 is applied, but considering that the rectifier output voltage is applied to the field coil 20, the resistance value is set higher than that of the conventional one, while the battery voltage is the rectifier output voltage. Since a sufficiently lower voltage, for example 12V or 24V, is used, the field current '20 is kept at a relatively low value, and there is no need for special control.

When the field current '20 flows, the generator 12 starts generating electricity, the rectifier output voltage Voo becomes vini, and the smoothing capacitor 16 is charged. After the desired time has elapsed, the current 136 supplied by the power supply selection circuit 34 is
, relay contact 38 is turned off, and relay 28.30
Switch the contacts to the 28a and 30a sides. Thereby, the output end of the rectifier 14 and the field coil 20 are connected via the field controller 26. Immediately after this switching, the electric power charged in the smoothing capacitor 16 is used to generate the field current '
Run 20.

Next, a signal 34a is sent from the power supply selection circuit 34 to the VDC adjustment circuit 40, and the output voltage VDC of the rectifier 14 is set to a predetermined value VDC.
, V to be et. . The adjustment circuit 40 is started to operate. One end of the Zunawara circuit 40 is connected to the output end of the rectifier 14, and the other end is connected to the transistor 42 and the diode 4.
4 to the relays 28 and 30, and by controlling the duty of the transistor 42, VDC is set to V. I'm trying to make it 1.

vDC=V,. , the inverter 18 is activated to start supplying AC power to the load, and the rectifier 1
The field current '20 begins to flow with the output voltage of 4.

FIG. 3 is a timing diagram showing the operation of this embodiment, where tl is the time of starting the high frequency power generation a12, t2 is the time of switching the supply power of the field current '20, t3 is the output voltage V of the rectifier 14, . Vini to V,. .

From the power supply selection circuit 34 to the VDC adjustment circuit 40 in order to increase the
This shows the time when the signal 34a sent to is transmitted.

FIG. 3A shows a current '36 in the excitation coil 36 at tl.
is supplied and stopped at t2, and FIG. 3B shows that
11-t when current '36 flows and coil 36 is excited
2 indicates that the relay contact 38 is in the ON state,
FIG. 3C shows that while the relay contact 38 is in the ON state, the relay 2
8.30 contacts are on the 28b and 30b sides, and the field current'
20 is supplied using the compensation battery 22 as a power source, and t
2 indicates that the output side of the rectifier 14 has been switched, and the third
Diagram D shows that the field current '2 is due to the total voltage of the auxiliary battery 22.
Between t1 and t2 when 0 is flowing, the field current is determined by the voltage of the auxiliary battery 22 and the resistance value of the field coil 20.
, and FIG. 3E shows that the output voltage VDC of the rectifier 14 is generated from tl, is in the vini state until t3, and from the time t3, the output voltage VDC of the rectifier 14 is generated by the VDC adjustment circuit 40.
Figure 3F shows that it is increased to t3.
The signal is sent from the power supply selection circuit 34 to the VDC adjustment circuit 40 at @3
4a has been sent.

[Effects of the Invention] As explained above, according to the present invention, the auxiliary battery is used as the field current supply power only when starting the high frequency generator, and thereafter the rectifier output is used as the field current supply power. , the capacity of the auxiliary battery can be reduced by an amount that does not require the supply of field current. Therefore, the capacity of the battery charger for charging the auxiliary battery needs to be small, and as a result, the battery charger can be made smaller and lighter, and the efficiency of the power generation unit can be improved.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of a preferred embodiment of the gas turbine power generator according to the present invention, FIG. 2 is an internal configuration diagram of a field controller used in the embodiment shown in FIG. 1, and FIG. 3 is a diagram of the present embodiment. FIG. 4 is a diagram showing the overall configuration of a conventional gas turbine power generation device. 10... Gas turbine engine 12... High frequency generator 14... Rectifier 16... Smoothing capacitor 18... Inverter 20... Field coil 22... Auxiliary battery 24... Battery charger 26... Field controller 28.30... Relay as a switch 32.36
... Excitation coil 34 ... Power selection circuit 34a ... Signal 38 ... Relay contact 40 ... VDC adjustment circuit '20 ... Field current Fig. 1 Fig. 2 Fig. 3

Claims (1)

[Claims] A gas turbine engine, a high-frequency generator directly connected to the gas turbine engine, a rectifier that rectifies the output of the generator, a smoothing capacitor that smoothes the output of the rectifier, and a high-frequency generator that is smoothed by the smoothing capacitor. An inverter that converts DC power into an AC signal of a desired frequency, an auxiliary battery that causes field current to flow through a field coil provided in the high-frequency generator, and a battery charger that charges the auxiliary battery. , a field controller that controls the field current and controls the output of the high-frequency generator, wherein an output end of the auxiliary battery and an output end of the rectifier are connected to each other via a switching device. The auxiliary battery is selectively connected to the field coil, and when the high-frequency generator is started, the auxiliary battery is used as a field current supply source, and after the generator starts driving, the output voltage of the rectifier is set to a predetermined value. A gas turbine power generation device characterized in that the output of the rectifier is used as a power source for supplying field current.