JP2003157993A - Lighting system using small-sized gas turbine generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting system of which, generation of high harmonic is prevented, capable of stably lighting regardless of the fluctuation of alternating current output voltage from a gas turbine generator. SOLUTION: For the lighting system 1 lighting a lighting device 18 for a discharge lamp by the output of the small-sized gas turbine generator G, a direct current output voltage V2 is obtained by chopping a rectified output voltage V1 by a chopper circuit 14, here, the output voltage V1 is obtained by rectifying the alternating current output voltage by a rectifying circuit 13. The direct current output voltage V2 is converted into an alternating current output with required frequency by an inverter circuit 17, and supplied to the lighting device 18 for the discharge lamp. The input current of the chopper circuit 14 is formed into a requested sine wave form by a control circuit 16. The chopping operation of the chopping circuit 14 is controlled so as to keep the level of the direct current output voltage V2 at a prescribed level.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting system using a small gas turbine generator.

[0002]

2. Description of the Related Art In recent years, various compact power generation systems suitable for a regional distributed power supply system have been proposed from the viewpoint of rationalization of a power transmission and distribution system. As one of them, a small gas turbine generator, which is a so-called micro gas turbine, which is a combination of a small gas turbine and a permanent magnet type AC generator is used, and the electric power obtained by this is used in hospitals and supermarkets. A power supply system has been proposed to cover the power supply for various lighting and refrigerators in stores, office buildings, etc., but this system is small, easy to maintain, and economical. Attention is paid to the point.

A micro gas turbine used for such a purpose has a radial compressor one stage, a radial turbine one stage and a permanent magnet type induction generator coaxially provided with a pressure ratio of about 4, and a turbine inlet temperature of 1000. Usually 90,0 at ℃
It is a small gas turbine that operates at a high speed of 00 (rpm) or more, and is equipped with a plate fin type regenerator that uses gas turbine exhaust gas as a heat source to increase power generation efficiency. The AC generator has a field structure of about two poles using a permanent magnet, and has a structure of, for example, 1,600.
A sinusoidal AC output voltage of Hz can be obtained.

[0004]

By the way, when an illumination system using a small gas turbine generator such as the above-mentioned micro gas turbine generator is to be installed in a building such as a hospital or a supermarket, the following is required. I have a problem. First, since a permanent magnet is used for the field of the generator, it is difficult to adjust the fluctuation of the generator output voltage caused by the fluctuation of the generator load on the generator side, and a constant voltage is supplied to the load. That is, a stabilizer is required. Furthermore, the rotational speed of a small gas turbine greatly fluctuates due to various factors, which causes a large fluctuation in the frequency of the output voltage, and a lighting device with a rated frequency such as a fluorescent lamp is used as a load. When connected, there is a problem that a satisfactory operation cannot be expected. Further, when the frequency of the generator output voltage largely fluctuates in this way, a more expensive main inverter device is required as a stabilizing device for stabilizing the output voltage, and there is also a problem that the equipment cost increases. is doing. However, when the inverter device is used, another problem arises in that the generation of harmonics causes noise interference to surrounding electronic devices and the like.

An object of the present invention is to provide a lighting system using a small gas turbine generator, which can solve the above-mentioned problems in the prior art and which is suitable as a regional distributed lighting system.

[0006]

In order to solve the above problems, according to the present invention, a permanent magnet type AC generator is discharged using a small gas turbine generator configured to be driven by a small gas turbine. A lighting system for lighting an electric lighting device, comprising a rectifier circuit for rectifying an AC output voltage output from the AC generator, and a DC output by chopping the rectified output voltage from the rectifier circuit. A chopper circuit for obtaining the current, a current detection circuit for detecting the level of the input current to the chopper circuit, the input current having a required sine waveform in response to the detection output from the current detection circuit, and the direct current A control circuit for controlling the chopping operation of the chopper circuit so that the level of the output is maintained at a predetermined level, and the DC output from the chopper circuit are controlled by the required frequency. Lighting system using a small gas turbine generator, comprising: an inverter circuit for converting into several AC outputs; and an AC output from the inverter circuit is supplied to the lighting device for a discharge lamp. Is proposed.

According to the present invention, there is further provided a lighting system using a small gas turbine generator configured to drive a permanent magnet type AC generator with a small gas turbine, wherein the output of the AC generator is And a plurality of discharge lamp lighting units connected to the lighting wiring circuit, and a plurality of discharge lamp lighting units connected to the lighting wiring circuit. A unit, a rectifier circuit for rectifying an AC output voltage from the AC generator received from the lighting wiring circuit, and a chopper circuit for chopping the rectified output voltage from the rectifier circuit to obtain a DC output. A current detection circuit for detecting the level of the input current to the chopper circuit, and a level of the direct current output while the input current has a required sine waveform in response to the detection output from the current detection circuit. A control circuit for controlling the chopping operation of the chopper circuit to be maintained at a predetermined level, an inverter circuit for converting the DC output from the chopper circuit to the AC output of the required frequency,
An illumination system using a small gas turbine generator is provided, which comprises a lighting device for a discharge lamp that is turned on by an AC output from the inverter circuit.

The AC output voltage output from the small gas turbine generator is rectified by a rectifier circuit. The rectified output voltage thus obtained is chopped in the chopper circuit to obtain a DC output. The chopping operation in the chopper circuit is controlled by the control circuit so that the input current becomes the required sine wave, so the level of harmonics generated from the small gas turbine generator to the chopper circuit is small, and It is possible to reduce the level of the noise signal radiated to the outside. Therefore, even if the plurality of discharge lamp lighting units are connected to the lighting wiring circuit extended from the distribution board, and the lighting wiring circuit is routed in, for example, the inside of the building and / or outside the building. It is useful for preventing the generation of noise interference that hinders the operation of various electric devices such as personal computers.

Further, since the control circuit controls the chopping operation so that the level of the DC output from the chopper circuit is maintained at a predetermined level, the level of the AC output voltage from the small gas turbine generator changes greatly. However, the discharge lamp lighting device can perform a stable lighting operation without being greatly affected by this.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An example of an embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a system configuration diagram showing an example of an embodiment of an illumination system using a small gas turbine generator according to the present invention. Illumination system 1 shown in FIG.
Is a regional distributed lighting system using a small gas turbine generator, which is suitable as a lighting system in a hospital or a large-scale retail store such as a supermarket.

In FIG. 1, 2 is a small gas turbine,
3 is a three-phase AC generator, the small gas turbine 2 is rotated by receiving fuel from a fuel tank (not shown), and its output shaft 2A has a rotating shaft 3A of the three-phase AC generator 3.
Are connected by an appropriate connecting member. Therefore,
The three-phase AC generator 3 is operated at the same rotation speed as the output rotation of the small gas turbine 2 (in this case, 96,000 (rpm)).

The three-phase AC generator 3 is of a three-phase three-wire type whose field is composed of two poles using permanent magnets, and its output lines U, V and W have a frequency of 1,600 Hz. The three-phase AC voltage is output. The three-phase AC generator 3 itself is an AC generator having a known structure, and the waveform of the 1,600 Hz three-phase AC voltage output from the three-phase AC generator 3 is substantially a sine wave.

In the embodiment shown in FIG. 1, the output of the three-phase AC generator 3 is rated at 30 kW, and the small gas turbine 2 and the three-phase AC generator 3 generate a small gas output of 30 kW. A turbine generator G is configured. As such a small gas turbine generator G, for example, 30 kW of Capstone Turbine Corporation
A turbo generator can be used.

The output lines U, V, W of the three-phase AC generator 3 are connected to the input side of the generator breaker 4, and the output side terminals R, S, T of the generator breaker 4 are illuminated. The lighting distribution board 5 is connected to the distribution board 5, and a plurality of lighting wiring circuits 6-1 to 6-N are provided on the output side of the lighting distribution board 5 and extend to required locations in the building. Then, these wiring circuits for illumination 6-
Lighting units 10 for discharge lamps 1 to 6-N, respectively.
Are connected multiple times. The lighting unit 10 has a built-in discharge lamp lighting device such as a fluorescent lamp lighting device, receives an AC output voltage from the small gas turbine generator G, and stably lights the built-in discharge lamp lighting device. It is a unitized lighting device configured as described above.

FIG. 2 is a block diagram showing the structure of the lighting unit 10. A pair of input terminals 11A, 1
1B is connected to any of the lighting wiring circuits, and receives the AC output voltage from the small gas turbine generator G via the lighting wiring circuit. The AC output voltage thus received is sent to the rectifier circuit 13 via the filter device 12 for noise removal which is composed of a known LC type filter circuit.

The rectifier circuit 13 includes four diodes D1 to D1.
This is a known full-wave rectifier circuit configured as a diode bridge circuit using D4, and the rectified output voltage V1 from the rectifier circuit 13 is input to the chopper circuit 14.

The chopper circuit 14 is a circuit for obtaining a DC output voltage V2 by chopping the rectified output voltage V1 having a full-wave rectified waveform. In the chopper circuit 14, an input current to the chopper circuit 14 is provided. An input current detection circuit 141 and a zero-cross detection circuit 142 for detecting

The input current detection circuit 141 outputs a first detection voltage U1 having a level corresponding to the level of the input current to the chopper circuit 14, and the first detection voltage U1 is a DC output voltage V2. It is input to the circuit 16. The zero-cross detection circuit 142 is a circuit for detecting that the current flowing through a boosting circuit, which will be described later, provided in the chopper circuit 14 has become zero, and the second detection voltage U2 from the zero-cross detection circuit 142. Is also input to the control circuit 16. The control circuit 16 further includes
The rectified output voltage V1 is also input.

The control circuit 16 includes a rectified output voltage V1, a DC output voltage V2, a first detection voltage U1 and a second detection voltage U2.
In response to the above, the input current of the chopper circuit 14 becomes a sine wave current corresponding to the rectified output voltage V1 which is a sine wave voltage, and chopping in the chopper circuit 14 is performed so that the value of the DC output voltage V2 is maintained at a required level. The circuit configuration is such that the chopping control signal S1 required for controlling the operation is given to the chopper circuit 14.

As a result, the chopper circuit 14 keeps its input current waveform at a required sine wave corresponding to the rectified output voltage V1, and even if the level of the AC output voltage from the small gas turbine generator G fluctuates. It operates so as to maintain the level of the DC output voltage V2 at a predetermined level.

The DC output voltage V2 of the predetermined level thus obtained is input to the inverter circuit 17, where it is converted into an AC output voltage of a required frequency necessary for lighting the discharge lamp lighting device 18. . The AC output voltage AC from the inverter circuit 17 is a fluorescent lamp lighting device configured as a known fluorescent lamp lighting device in which a fluorescent lamp 18A, a capacitor 18B for flowing a preheating current, and a ballast 18C are connected as shown in the drawing. It is supplied to the device 18.

In the present embodiment, the ballast 18C is provided with a secondary winding 18Ca for current detection, and the level of the input current to the discharge lamp lighting device 18 obtained from the secondary winding 18Ca is adjusted. The third detection voltage U3 shown is input to the determination circuit 19. Then, the determination circuit 19 determines based on the third detection voltage U3 whether or not an excessive level of load current has flown to the control circuit 16.

When the determination circuit 19 determines that an abnormality has occurred in the load, the determination circuit 19 outputs the voltage drop command signal S2 to the inverter circuit 17 to reduce or cut off the output level, and the discharge lamp lighting device. It is configured to prevent damage to 18 and damage to the lamp and socket.

FIG. 3 shows an example of a more specific circuit configuration of the chopper circuit 14 including the input current detection circuit 141 and the zero-cross detection circuit 142, and the control circuit 16.

In the circuit configuration shown in FIG. 3, the chopper circuit 14 is configured as a boost converter. The chopper circuit 14 includes an input capacitor 14A and a boost coil 14
B, switching transistor 14C, detection resistor 14
D, diode 14E, noise removing capacitor 14F,
A smoothing output capacitor 14G is connected as shown in the figure. Here, T1 and T2 are a pair of input terminals to which the rectified output voltage V1 is applied, and T3 and T4 are DC output voltage V
2 is a pair of output terminals for outputting, and the input terminal T2 and the output terminal T4 are commonly connected and grounded.

In the chopper circuit 14, the switching transistor 14C is on / off controlled in accordance with the chopping control signal S1 from the control circuit 16, whereby the high voltage energy generated in the boosting coil 14B is generated by the diode 14a.
It is configured to act as a boost converter stored in the smoothing output capacitor 14G via E.

To detect this by utilizing the fact that the input current to the chopper circuit 14 is proportional to the current flowing through the switching transistor 14C, the detection resistor 14D is connected in series with the drain-source circuit of the switching transistor 14C. The voltage generated in the detection resistor 14D is extracted as the first detection voltage U1. That is, in the configuration shown in FIG. 3, the detection resistor 14D constitutes the input current detection circuit 141.

On the other hand, the zero-cross detection circuit 142 is composed of a secondary winding 14Ba provided on the boosting coil 14B and a resistor 14Bb for grounding one end of the secondary winding 14Ba and flowing into the chopper circuit 14. The timing at which the secondary voltage generated in the secondary winding 14Ba by the applied current becomes zero level indicates the zero cross timing.

The control circuit 16 sets the target voltage Vt indicating the desired target level value of the DC output voltage V2 to the DC output voltage V2.
And a control amplifier 16A that outputs a first error voltage ΔV1 indicating the difference between the two and a multiplier 16B that performs a multiplication process of the first error voltage ΔV1 and the rectified output voltage V1.

The multiplication result in the multiplier 16B shows the target current value It of the input current to the chopper circuit 14, and the target current It shows the required sine wave current. Multiplier 16
The output voltage Vi indicating the target current value It from B is calculated by the comparator 1
At 6C, the level is compared with the first detection voltage U1,
A second error voltage ΔV2 indicating the difference between the two is output. The second error voltage ΔV2 is input to the drive circuit 16D to which the second detection voltage U2 is input, and the drive circuit 16D outputs the chopping control signal S1.

Next, the operation of the circuit shown in FIG. 3 will be described. The input current value when the switching transistor 14C is turned off corresponds to the peak value of the choke current flowing through the boost coil 14B, and when the peak choke current value reaches a predetermined value, the comparator 16C accurately turns off the switching transistor 14C. .

This predetermined value is set by the multiplier 16B to a value proportional to the product of the input voltage instantaneous value and the output voltage. The switching transistor 14C is the boost coil 1
The off state is maintained until the current flowing through 4B and the diode 14E becomes zero.

The second detection voltage U2 is used for the zero cross control of the diode current. The polarity of the second detection voltage U2 changes depending on the operating state, the boosting coil 14B stores magnetic energy during the conduction period of the switching transistor 14C, its output terminal 14Bc becomes negative, and during the OFF period of the switching transistor 14C. Magnetic energy is emitted and the output terminal 14Bc becomes positive. When the energy release is completed, the choke voltage returns to zero, or the polarity of the output terminal 14Bc becomes negative again due to overswing.

Since the lighting unit 10 is constructed as described above, the chopping operation in the chopper circuit 14 is controlled by the control circuit 16 so that the input current of the chopper circuit 14 becomes a required sine wave. Therefore, the current consumption waveform of the lighting unit 10 is a sine wave,
Since the level of harmonics generated between the small gas turbine generator G and the chopper circuit 14 becomes small,
The level of the noise signal radiated from the lighting wiring circuits 6-1 to 6-N can be reduced. As a result,
Lighting wiring circuits 6-1 to 6 extended from the lighting distribution board 5
Even if -N is routed in a building, for example, it is possible to minimize the inhibition of the operation of various electrical devices inside and / or outside the building, such as a personal computer.

The control circuit 16 also includes a chopper circuit 14
Since the chopping operation is controlled so that the level of the DC output voltage V2 from the engine is maintained at a predetermined level, even if the level of the AC output voltage from the small gas turbine generator G changes significantly, this effect is greatly affected. Therefore, the lighting device 18 for the discharge lamp in the lighting unit 10 can be stably turned on.

In the above embodiment, an example of lighting the discharge lamp lighting device has been described. But,
The present invention is not limited to this embodiment, and can be similarly applied to lighting of a lamp other than the fluorescent lamp, for example, an HID lamp of about 150 W, and similar effects can be obtained.

[0038]

As described above, according to the present invention, since the consumption current waveform of the discharge lamp lighting device can be made into a sine wave, the generation of harmonics can be suppressed to an extremely low level, and the surrounding electronic devices can be suppressed. It is possible to effectively suppress noise interference to the etc. Further, since the voltage supplied to the discharge lamp lighting device can be kept constant regardless of the level variation of the AC output voltage from the small gas turbine generator, the discharge lamp lighting device can be lit stably. it can.

[Brief description of drawings]

FIG. 1 is a system configuration diagram showing an example of an embodiment of a lighting system using a small gas turbine generator according to the present invention.

FIG. 2 is a block diagram showing the configuration of the lighting unit shown in FIG.

3 is a circuit diagram showing an example of a more specific circuit configuration of a chopper circuit and a control circuit shown in FIG.

[Explanation of symbols]

1 lighting system 2 Small gas turbine 3 three-phase AC generator 4 Generator breaker 5 Lighting distribution board 6-1 to 6-N Lighting wiring circuit 10 Lighting unit 12 Filter device 13 Rectifier circuit 14 Chopper circuit 16 Control circuit 17 Inverter circuit 18 Lighting equipment for discharge lamps 19 Judgment circuit 141 Input current detection circuit AC AC output voltage G small gas turbine generator S1 chopping control signal S2 voltage drop command signal U1 first detection voltage U2 second detection voltage U3 Third detection voltage V1 rectified output voltage V2 DC output voltage ΔV1 First error voltage ΔV2 Second error voltage

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masahiro Mori             Firth, 10-13 Daikanmachi, Hiratsuka City, Kanagawa Prefecture             Tobil Daikancho 7th floor No.7 Zenshin Electric Power Co., Inc.             Inside engineering (72) Inventor Makoto Saito             1121 Sakurayama, Takamori, Yamato-mura, Makabe-gun, Ibaraki Prefecture             11 Iwasaki Electric Co., Ltd. Ibaraki Works (72) Inventor Ryusuke Yamaguchi             1121 Sakurayama, Takamori, Yamato-mura, Makabe-gun, Ibaraki Prefecture             11 Iwasaki Electric Co., Ltd. Ibaraki Works F term (reference) 3K072 AA02 AB01 AC02 AC11 BA05                       BB01 BB10 CA14 CB08 CB10                       DB03 DE02 DE05 FA04 FA05                       FA06 FA07 GA01 GA03 GB01                       GB03 HA10                 5H007 BB03 CA02 CB09 CC12 DB01                       DC02 DC05 EA13

Claims (2)

[Claims] 1. A lighting system for lighting a discharge lamp lighting device using a small gas turbine generator configured to drive a permanent magnet type AC generator with a small gas turbine, the alternating current system comprising: A rectifier circuit for rectifying the AC output voltage output from the generator, a chopper circuit for chopping the rectified output voltage from the rectifier circuit to obtain a DC output, and a level of the input current to the chopper circuit. A current detection circuit for detecting, and a chopping operation of the chopper circuit so that the input current has a required sine waveform and the level of the DC output is maintained at a predetermined level in response to a detection output from the current detection circuit. And a inverter circuit for converting the DC output from the chopper circuit into an AC output of a required frequency. Lighting system using a small gas turbine generator, characterized in that the AC output from the inverter circuit so as to supply to the discharge lamp lighting device. 2. A lighting system using a small gas turbine generator configured to drive a permanent magnet type AC generator with a small gas turbine, the lighting system being provided on the output side of the AC generator. An electric panel, an illumination wiring circuit extending from the distribution panel, and a plurality of discharge lamp illumination units connected to the illumination wiring circuit, wherein the discharge lamp illumination unit is the illumination unit. A rectifier circuit for rectifying the AC output voltage from the AC generator received from the wiring circuit, a chopper circuit for chopping the rectified output voltage from the rectifier circuit to obtain a DC output, and a chopper circuit for the chopper circuit. A current detection circuit for detecting the level of the input current, and in response to the detection output from the current detection circuit, the input current has a required sine waveform and the level of the DC output is maintained at a predetermined level. Control circuit for controlling the chopping operation of the chopper circuit, an inverter circuit for converting the DC output from the chopper circuit into an AC output of a required frequency, and lighting with an AC output from the inverter circuit. A lighting system for a small gas turbine generator, comprising: