JP7798820B2 - Power generation device, power generation system, power generation method, and program - Google Patents

Description

This disclosure relates to a power generation device, a power generation system, a power generation method, and a program.

There are power generation systems that generate electricity by rotating the rotor of a generator using a steam turbine or gas turbine. Patent Document 1 discloses related technology, including technology related to an excitation device for a generator.

JP 2010-088234 A

When generating electricity by rotating the generator rotor using a steam turbine or gas turbine, a magnetic field is generated by the generator's field winding, generator rectifier, main exciter, and main exciter rectifier, and the generator rotor must be placed within that magnetic field. The main exciter is composed of a main exciter and a main exciter field winding, and receives AC power from an external source and inputs the received AC power into the main exciter rectifier. The DC power rectified by the main exciter rectifier then causes DC current to flow through the main exciter's field winding, generating a magnetic field around the main exciter's rotor. This allows AC power to be generated from the main exciter. The AC power generated by the main exciter is input into the generator rectifier. The DC power rectified by the generator rectifier then causes DC current to flow through the generator's field winding, generating a magnetic field around the generator rotor. In this way, the generator rotor is placed within a magnetic field.

The AC power received by the rectifier of the main exciter may be supplied from a commercial AC power source. Loads other than the power generation system equipped with the main exciter may also be connected to this commercial AC power source. As a result, the AC voltage of the AC power supplied from the commercial AC power source may be distorted from a sine wave (causing voltage fluctuations, harmonics, and power outages). If the AC voltage of the AC power received by the rectifier of the main exciter is distorted from a sine wave, the desired magnetic field cannot be generated, and the generator may not generate power properly. For this reason, the AC power received by the rectifier of the main exciter is set to high AC voltage to suppress the effects of voltage fluctuations due to load changes and voltage fluctuations caused by noise. In other words, to suppress voltage fluctuations in the AC voltage of the AC power received by the rectifier of the main exciter, a high-voltage commercial AC power source with little distortion is required.

However, since the AC power received by the rectifier of the main exciter is small compared to the power supplied from the high-voltage AC circuit (due to the small current), it is generally supplied from a low-voltage AC circuit from the perspective of circuit protection. Therefore, there is a need for technology that can supply the AC power received by the rectifier of the main exciter from a low-voltage AC circuit and reduce the effects of distortion.

The present disclosure has been made to solve the above-mentioned problems, and aims to provide a power generation device, power generation system, power generation method, and program that can supply AC power received by the rectifier of a main exciter from an AC low-voltage circuit, thereby reducing the effects of distortion.

In order to solve the above-mentioned problems, a power generating device according to the present disclosure includes: a first power supply that outputs a power smaller than the power that can generate a first magnetic field that is a magnetic field for a generator to generate power, and that is capable of outputting a first AC voltage; a first device that, when the first AC voltage is output from the first power supply, generates a DC voltage from the first AC voltage and generates a second AC voltage from the generated DC voltage that is closer to a sine wave than the first AC voltage; a main exciter that generates AC power of a third AC voltage in a second magnetic field that is generated based on the DC power generated from the AC power of the second AC voltage; a generator that generates AC power of a fourth AC voltage in the first magnetic field generated based on DC power generated by the generator; a second power supply that outputs power smaller than the power that can generate the first magnetic field, and that is capable of outputting a fifth AC voltage that is the same low voltage as the first AC voltage independently from the first AC voltage; and a second device that generates a DC voltage from the fifth AC voltage in place of the first AC voltage, and that is capable of generating a sixth AC voltage from the generated DC voltage that is closer to a sine wave than the fifth AC voltage, wherein the second power supply outputs the fifth AC voltage when the first AC voltage is not being output from the first power supply .

The power generation system according to the present disclosure includes the above-described power generation device and a turbine that rotates a rotor shaft and is connected to the generator included in the power generation device via the rotor shaft.

A power generation method according to the present disclosure is a power generation method performed by a power generation device including: a first power supply that outputs a power smaller than the power that can generate a first magnetic field, which is a magnetic field for a generator to generate power, and that is capable of outputting a first AC voltage; and a second power supply that outputs a power smaller than the power that can generate the first magnetic field, and that is capable of outputting a fifth AC voltage that is the same low voltage as the first AC voltage, independently from the first AC voltage, and that outputs the fifth AC voltage when the first AC voltage is not being output from the first power supply, wherein when the first AC voltage is being output from the first power supply, generating a third AC voltage in a second magnetic field generated based on DC power generated from the second AC voltage; generating a fourth AC voltage in the first magnetic field generated based on DC power generated from the third AC voltage; and generating a fifth AC voltage from the fifth AC voltage in place of the first AC voltage when the first AC voltage is not being output from the first power source, and generating a sixth AC voltage from the generated DC voltage that is closer to a sine wave than the fifth AC voltage .

The program according to the present disclosure provides a program for causing a computer of a power generating device including: a first power supply that outputs a power smaller than that capable of generating a first magnetic field, which is a magnetic field for generating electricity by a generator, and that is capable of outputting a first AC voltage; and a second power supply that outputs a power smaller than that capable of generating the first magnetic field, and that is capable of outputting a fifth AC voltage, which is the same low voltage as the first AC voltage, independently from the first AC voltage, and that outputs the fifth AC voltage when the first AC voltage is not being output from the first power supply, to generate a DC voltage from the first AC voltage when the first AC voltage is being output from the first power supply. generating a second AC voltage from the generated DC voltage, the second AC voltage having a waveform closer to a sine wave than the first AC voltage; generating AC power of a third AC voltage in a second magnetic field generated based on DC power generated from AC power of the second AC voltage; generating AC power of a fourth AC voltage in the first magnetic field generated based on DC power generated from AC power of the third AC voltage; and, when the first AC voltage is not being output from the first power source, generating a DC voltage from the fifth AC voltage instead of the first AC voltage, and generating a sixth AC voltage from the generated DC voltage, the sixth AC voltage having a waveform closer to a sine wave than the fifth AC voltage .

The power generation device, power generation system, power generation method, and program disclosed herein enable the use of an AC power supply that outputs low-power AC power and low-voltage AC voltage when generating a magnetic field for the generator to generate electricity based on the AC voltage of the AC power received by the rectifier of the main exciter.

1 is a diagram illustrating an example of a configuration of a power generation system according to a first embodiment of the present disclosure. 1 is a diagram illustrating an example of the configuration of a power source reforming apparatus according to a first embodiment of the present disclosure. FIG. 4 is a diagram showing an example of a processing flow of a program of the power generation system according to the first embodiment of the present disclosure. FIG. 10 is a diagram illustrating an example of the configuration of a power generation system according to a second embodiment of the present disclosure. FIG. 10 is a diagram illustrating an example of the configuration of a switching unit according to a second embodiment of the present disclosure. FIG. 10 is a diagram illustrating an example of the configuration of a power generation system according to a third embodiment of the present disclosure. FIG. 1 is a schematic block diagram illustrating the configuration of a computer according to at least one embodiment.

First Embodiment
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A power generation system 1 according to a first embodiment of the present disclosure will be described below with reference to the accompanying drawings.

(Configuration of power generation system)
Fig. 1 is a diagram illustrating an example of the configuration of a power generation system 1 according to a first embodiment of the present disclosure. As shown in Fig. 1, the power generation system 1 includes a power generation device 10, a low-voltage power supply 20 (an example of a first power supply), a turbine 30, and a rotor shaft 40. The power generation system 1 is a system that generates power by generating, from a low-voltage AC power supply, a magnetic field for a generator 101 (described later) included in the power generation device 10 to generate power.

As shown in FIG. 1, the power generation system 10 includes a generator 101, a rectifier 102, a rectifier 104, a power reformer 105 (an example of a first device), and a main excitation device 108.

The generator 101 includes a first field winding 101a. When a direct current flows through the first field winding 101a, it generates a magnetic field that allows the generator 101 to generate power. For example, the first field winding 101a is an electromagnet coil. As shown in FIG. 1, the generator 101 is connected to the turbine 30 and a main exciter 103 (described below) via the rotor shaft 40. The generator 101 generates power when the turbine 30 rotates, rotating a rotor having a rotor of the generator 101 in the magnetic field. For example, the generator 101 outputs the generated power to a step-up transformer.

The rectifier 102 generates DC power by rectifying the AC power generated by the main exciter 103. The rectifier 102 supplies the generated DC power to the first field winding 101a. This DC power causes a DC current to flow through the first field winding 101a (i.e., a magnetic field is generated for the generator 101 to generate power). Examples of rectifiers 102 include power conversion devices such as converters that convert AC power to DC power using circuits that use power semiconductors such as diodes and thyristors.

The main excitation device 108 includes a main exciter 103 and a second field winding 103a. By passing a DC current through the second field winding 103a, it generates a magnetic field that allows the main exciter 103 to generate AC power. For example, the second field winding 103a is an electromagnet coil. The main exciter 103 generates AC power by rotating the turbine 30 and rotating a rotor having the rotor of the main exciter 103 in the magnetic field. Note that the power generated by the main exciter 103 is used only to generate a magnetic field for the generator 101 to generate power. Therefore, the power generated by the main exciter 103 is smaller than the power generated by the generator 101. The main exciter 103 outputs the generated AC power to the rectifier 102.

The rectifier 104 generates DC power by rectifying the AC power output by the power source reformer 105. The rectifier 104 supplies the generated DC power to the second field winding 103a. This DC power causes a DC current to flow through the second field winding 103a (i.e., a magnetic field is generated so that the main exciter 103 generates AC power). Examples of rectifiers 104 include power conversion devices such as converters that convert AC power to DC power using circuits that use power semiconductors such as diodes and thyristors.

The power supply reformer 105 improves the AC voltage fluctuations of the AC power supplied from the low-voltage power supply 20. The power supply reformer 105 then outputs the improved AC voltage to the rectifier 104. Figure 2 is a diagram showing an example of the configuration of the power supply reformer 105 according to the first embodiment of the present disclosure. For example, as shown in Figure 2, the power supply reformer 105 includes a converter 105a and an inverter 105b.

Converter 105a converts the AC voltage supplied from low-voltage power supply 20 into DC voltage. Converter 105a outputs the converted DC voltage to inverter 105b. In addition, inverter 105b converts the DC voltage output by converter 105a into AC voltage (i.e., AC power). Inverter 105b outputs the converted AC power to rectifier 104. In other words, power supply reformer 105 converts the AC voltage supplied from low-voltage power supply 20 into a DC voltage that is less affected by the magnitude of distortion (i.e., a substantially constant voltage). Then, power supply reformer 105 converts the substantially constant voltage into an AC voltage that is substantially sinusoidal and has almost no distortion. Therefore, power supply reformer 105 can convert the AC voltage supplied from low-voltage power supply 20 into an AC voltage with almost no distortion.

The low-voltage power supply 20 is a commercial AC power supply capable of outputting a low-voltage AC voltage (for example, 600 volts of AC (Alternating Current)). A load (not shown) other than the power generation system 1 may be connected to the low-voltage power supply 20. Therefore, the AC voltage supplied from the low-voltage power supply 20 may be highly distorted. The low-voltage power supply 20 outputs the AC voltage to the power source reformer 105. The low-voltage power supply 20 is a power supply that can only output a power level that is insufficient to generate a magnetic field for the generator 101 to generate electricity, even if it supplies AC power to the rectifier 102.

The turbine 30 rotates the rotor shaft 40. Examples of the turbine 30 include a steam turbine and a gas turbine.

(Processing performed by the power generation system)
3 is a diagram illustrating an example of a processing flow of the power generation system 1 according to the first embodiment of the present disclosure. Next, the processing performed by the power generation system 1 will be described with reference to FIG. 3. It is assumed that the turbine 30 is rotating the rotor shaft 40.

The low-voltage power supply 20 outputs an AC voltage to the power supply reformer 105. The power supply reformer 105 improves the AC voltage fluctuations of the AC power supplied from the low-voltage power supply 20 (step S1). For example, as shown in FIG. 2, the power supply reformer 105 includes a converter 105a and an inverter 105b. The power supply reformer 105 then converts the AC voltage supplied from the low-voltage power supply 20 into an AC voltage with almost no distortion. The power supply reformer 105 outputs the improved AC voltage to the rectifier 104.

The rectifier 104 generates DC power by rectifying the AC power output by the power source reformer 105 (step S2). The rectifier 104 supplies the generated DC power to the second field winding 103a.

A DC current flows through the second field winding 103a, generating a magnetic field that causes the main exciter 103 to generate AC power (step S3). The main exciter 103 generates AC power by rotating the rotor, which has the armature coil (rotor) of the main exciter 103, in the magnetic field as the turbine 30 rotates (step S4). The main exciter 103 outputs the generated AC power to the rectifier 102.

The rectifier 102 generates DC power by rectifying the AC power generated by the main exciter 103 (step S5). The rectifier 102 supplies the generated DC power to the first field winding 101a.

A direct current flows through the first field winding 101a, generating a magnetic field for the generator 101 to generate electricity (step S6). The generator 101 generates electricity by rotating the turbine 30 and rotating the rotor having the armature coil (rotor) of the generator 101 in the magnetic field (step S7). The generator 101 outputs the generated power to the step-up transformer.

(advantage)
The above has described a power generation system 1 according to a first embodiment of the present disclosure. In the power generation system 1, the power generation device 10 includes: a low-voltage power supply 20 (an example of a first power supply) that outputs a power smaller than the power that can generate a first magnetic field, which is a magnetic field for generating power by a generator 101, and that is capable of outputting a first AC voltage; a power source reforming device 105 (an example of a first device) that, when the first AC voltage is output from the low-voltage power supply 20, generates a DC voltage from the first AC voltage and generates a second AC voltage from the generated DC voltage that is closer to a sine wave than the first AC voltage; a main exciter 103 that generates AC power of a third AC voltage in a second magnetic field generated based on DC power generated from AC power of the second AC voltage; and the generator 101 that generates AC power of a fourth AC voltage in the first magnetic field generated based on the DC power generated from the AC power of the third AC voltage.

As a result, the power source reforming device 105 can generate AC voltage with small voltage fluctuations from the low-voltage AC voltage that is low-power AC power output by the AC power source and has large voltage fluctuations. As a result, in the power generation system 1, the power generation device 10 can use an AC power source that outputs low-power AC power and low-voltage AC voltage when generating a magnetic field for the generator to generate electricity based on the AC voltage of the AC power received by the rectifier 104 of the main exciter 103.

Second Embodiment
Next, a power generation system 1 according to a second embodiment of the present disclosure will be described. The following mainly describes the differences between the power generation system 1 according to the second embodiment of the present disclosure and the power generation system 1 according to the first embodiment of the present disclosure.

(Configuration of power generation system)
Fig. 4 is a diagram showing an example of the configuration of a power generation system 1 according to a second embodiment of the present disclosure. As shown in Fig. 4, the power generation system 1 includes a power generation device 10, a low-voltage power supply 20 (an example of a first power supply), a turbine 30, and a rotor shaft 40, and further includes a low-voltage power supply 50 (an example of a second power supply).

As shown in FIG. 4, the power generation device 10 includes a generator 101, a rectifier 102, a main exciter 103, a rectifier 104, and a power source reformer 105 (an example of a first device), as well as a switching unit 106. The switching unit 106 switches between the low-voltage power supply 20 and the low-voltage power supply 50. For example, the switching unit 106 is provided between the low-voltage power supplies 20 and 50 and the rectifier 104, and disconnects the low-voltage power supply 50 from the rectifier 104 when AC power is being supplied from the low-voltage power supply 20 to the power generation device 10. Furthermore, the switching unit 106 connects the low-voltage power supply 50 to the rectifier 104 when AC power is not being supplied from the low-voltage power supply 20 to the power generation device 10. FIG. 5 is a diagram showing an example of the configuration of the switching unit 106 according to the second embodiment of the present disclosure. As shown in FIG. 5, the switching unit 106 is configured using, for example, an uninterruptible changeover switch, and when AC power is not being supplied from the low-voltage power supply 20 to the power generation device 10, the uninterruptible changeover switch can switch without interruption to the supply of AC power from the low-voltage power supply 50.

Note that in the first embodiment of the present disclosure, the AC power supplied to the rectifier 104 is the AC power output by the power source reforming device 105, whereas in the second embodiment of the present disclosure, the AC power supplied to the rectifier 104 is the AC power output by the power source reforming device 105 or the AC power supplied from the low-voltage power supply 50. Taking this difference into consideration, the processing performed by the power generation system 1 according to the second embodiment of the present disclosure shown in FIG. 4 can be considered to be similar to that of the power generation system 1 according to the first embodiment of the present disclosure.

(advantage)
The power generation system 1 according to the second embodiment of the present disclosure has been described above. In the power generation system 1, the switching unit 106 switches between the low-voltage power supply 20 and the low-voltage power supply 50. For example, the switching unit 106 is provided between the low-voltage power supply 20 and the low-voltage power supply 50 and the rectifier 104, and when AC power is being supplied from the low-voltage power supply 20 to the power generation device 10, the switching unit 106 disconnects the low-voltage power supply 50 from the rectifier 104. Furthermore, when AC power is not being supplied from the low-voltage power supply 20 to the power generation device 10, the switching unit 106 connects the low-voltage power supply 50 and the rectifier 104 without momentary interruption.

As a result, the switching unit 106 can supply AC power from the low-voltage power supply 50 to the power generation device 10 even when AC power is no longer supplied from the low-voltage power supply 20 to the power generation device 10. As a result, in the power generation system 1, the power generation device 10 can continue power generation operation without stopping power generation by the generator 101.

Third Embodiment
Next, a power generation system 1 according to a third embodiment of the present disclosure will be described. The following mainly describes the differences between the power generation system 1 according to the third embodiment of the present disclosure and the power generation system 1 according to the second embodiment of the present disclosure.

(Configuration of power generation system)
Fig. 6 is a diagram illustrating an example of the configuration of a power generation system 1 according to a third embodiment of the present disclosure. As shown in Fig. 6, the power generation system 1 includes a power generation device 10, a low-voltage power supply 20 (an example of a first power supply), a turbine 30, a rotor shaft 40, and a low-voltage power supply 50 (an example of a second power supply).

As shown in FIG. 6, the power generation system 10 includes a generator 101, a rectifier 102, a main exciter 103, a rectifier 104, a power supply reformer 105 (an example of a first device), and a switching unit 106, as well as a power supply reformer 107 (an example of a second device). As shown in FIG. 6, the power supply reformer 107 is provided between the low-voltage power supply 50 and the switching unit 106, and improves distortion in the AC voltage of the AC power supplied from the low-voltage power supply 50. The power supply reformer 107 then outputs the improved AC voltage to the rectifier 104 via the switching unit 106. Note that the power supply reformer 107 may have a configuration similar to that of the power supply reformer 105.

The switching unit 106 switches between the low-voltage power supply 20 and the low-voltage power supply 50. For example, the switching unit 106 is provided between the power supply reforming device 105 and the power supply reforming device 107 and the rectifier 104, and when AC power is being supplied from the low-voltage power supply 20 to the power generation device 10, the switching unit 106 disconnects the power supply reforming device 107 from the rectifier 104 without interruption. Furthermore, when AC power is not being supplied from the low-voltage power supply 20 to the power generation device 10, the switching unit 106 connects the power supply reforming device 107 to the rectifier 104. The switching unit 106 is configured using, for example, an uninterruptible changeover switch, similar to the switching unit 106 according to the second embodiment of the present disclosure, as shown in FIG. 5 . When AC power is not being supplied from the low-voltage power supply 20 to the power generation device 10, the uninterruptible changeover switch can uninterruptibly switch to AC power supplied from the low-voltage power supply 50.

Note that in the second embodiment of the present disclosure, the AC power supplied to the rectifier 104 is the AC power output by the power source reforming device 105 or the AC power supplied from the low-voltage power supply 50, whereas in the third embodiment of the present disclosure, the AC power supplied to the rectifier 104 is the AC power output by the power source reforming device 105 or the AC power output by the power source reforming device 107. Taking these differences into consideration, the processing performed by the power generation system 1 according to the third embodiment of the present disclosure shown in FIG. 6 can be considered to be similar to that of the power generation system 1 according to the second embodiment of the present disclosure.

(advantage)
The power generation system 1 according to the third embodiment of the present disclosure has been described above. In the power generation system 1, the power source reforming device 107 improves fluctuations in the AC voltage of the AC power supplied from the low-voltage power source 50.

This allows the power source reformer 107 to improve distortion in the AC voltage of the AC power supplied from the low-voltage power source 50 to the rectifier 104. As a result, in the power generation system 1, the power generation device 10 can improve the reliability of power generation by the generator 101 when AC power is no longer supplied to the power generation device 10 from the low-voltage power source 20.

Note that the order of the processes in the embodiments of the present disclosure may be changed as long as appropriate processing is performed.

In the embodiments of the present disclosure, each of the memory units and storage devices (including registers and latches) may be located anywhere within the range in which appropriate information can be transmitted and received. Furthermore, each of the memory units and storage devices may exist in multiple locations within the range in which appropriate information can be transmitted and received, and data may be stored in a distributed manner.

Although the embodiments of the present disclosure have been described, the power generation system 1, the power generation device 10, the turbine 30, and other control devices may have a computer system built therein. The above-described processing steps are stored in the form of a program on a computer-readable recording medium, and the computer reads and executes this program to perform the above processing. Specific examples of computers are shown below.
FIG. 7 is a schematic block diagram illustrating the configuration of a computer according to at least one embodiment.
As shown in FIG. 7, the computer 5 includes a CPU 6, a main memory 7, a storage 8, and an interface 9.
For example, the power generation system 1, the power generation device 10, the turbine 30, and the other control devices are implemented in a computer 5. The operations of the above-described processing units are stored in the storage 8 in the form of a program. The CPU 6 reads the program from the storage 8, loads it into the main memory 7, and executes the above-described processing in accordance with the program. The CPU 6 also allocates storage areas in the main memory 7 corresponding to the above-described storage units in accordance with the program.

Examples of storage 8 include HDD (Hard Disk Drive), SSD (Solid State Drive), magnetic disk, magneto-optical disk, CD-ROM (Compact Disc Read Only Memory), DVD-ROM (Digital Versatile Disc Read Only Memory), semiconductor memory, etc. Storage 8 may be internal media directly connected to the bus of computer 5, or external media connected to computer 5 via interface 9 or a communication line. Furthermore, if this program is distributed to computer 5 via a communication line, the computer 5 that receives the program may expand the program into main memory 7 and execute the above-mentioned processing. In at least one embodiment, storage 8 is a non-transitory, tangible storage medium.

The program may also implement some of the functions described above. Furthermore, the program may be a file that can implement the functions described above in combination with a program already recorded on the computer system, a so-called differential file (differential program).

Several embodiments of the present disclosure have been described, but these embodiments are merely examples and do not limit the scope of the disclosure. Various additions, omissions, substitutions, and modifications may be made to these embodiments without departing from the spirit of the disclosure.

<Additional Notes>
The power generation device 10, the power generation system 1, the power generation method, and the program described in each embodiment of the present disclosure can be understood, for example, as follows.

(1) A power generation device (10) according to a first aspect of the present invention includes:
a first power source (20) that outputs a power smaller than the power that can generate a first magnetic field, which is a magnetic field for generating power from a generator (101), and that is capable of outputting a first AC voltage;
a first device (105) that, when the first AC voltage is output from the first power source (20), generates a DC voltage from the first AC voltage and generates a second AC voltage from the generated DC voltage, the second AC voltage having a waveform closer to a sine wave than the first AC voltage;
a main exciter (103) that generates AC power of a third AC voltage in a second magnetic field generated based on DC power generated from AC power of the second AC voltage;
the generator (101) that generates AC power of a fourth AC voltage in the first magnetic field generated based on DC power generated from AC power of the third AC voltage;
Equipped with.

This power generating device (10) can use an AC power supply that outputs low-power AC power and low-voltage AC voltage when generating a magnetic field for the generator to generate electricity based on the AC voltage of the AC power received by the rectifier of the main exciter.

(2) A power generation device (10) according to a second aspect is the power generation device (10) of (1),
a first field winding (101a) which is a coil of an electromagnet that generates the first magnetic field;
The above configuration may be adopted.

This allows the power generation device (10) to generate a magnetic field that allows the generator to generate electricity.

(3) A power generation device (10) according to a third aspect is the power generation device (10) according to (1) or (2),
a second field winding (103a) which is a coil of an electromagnet that generates the second magnetic field;
The above configuration may be adopted.

This allows the power generating device (10) to generate a magnetic field that allows the main exciter to generate AC power.

(4) A power generation device (10) according to a fourth aspect is any one of the power generation devices (10) of (1) to (3),
a second power supply (50) that outputs a power smaller than the power capable of generating the first magnetic field and that is capable of outputting a fifth AC voltage that is the same low voltage as the first AC voltage, independently of the first AC voltage;
a second device (107) that generates a DC voltage from the fifth AC voltage instead of the first AC voltage, and that is capable of generating a sixth AC voltage from the generated DC voltage, the sixth AC voltage having a waveform closer to a sine wave than the fifth AC voltage;
Equipped with
The second power source (50)
When the first AC voltage is not output from the first power supply (20), the fifth AC voltage may be output.

As a result, even if AC power is no longer supplied from the first power source to the power generation device (10), AC power can be supplied from the second power source to the power generation device (10). As a result, in the power generation system, the power generation device (10) can continue power generation operation without stopping power generation by the generator.

(5) A power generation device (10) according to a fifth aspect is the power generation device (10) of (4),
a switching unit (106) that switches between the first power source and the second power source;
The above configuration may be adopted.

As a result, even if AC power is no longer supplied from the first power source to the power generation device (10), AC power can be supplied from the second power source to the power generation device (10). As a result, in the power generation system, the power generation device (10) can continue power generation operation without stopping power generation by the generator.

(6) A power generation device (10) according to a sixth aspect is the power generation device (10) according to (4) or (5),
The second device (107) comprises:
A DC voltage may be generated from the fifth AC voltage, and a sixth AC voltage having a waveform closer to a sine wave than the fifth AC voltage may be generated from the generated DC voltage.

This allows the power generation device (10) to improve distortion in the AC voltage of the AC power supplied from the second power source.

(7) A power generation system (1) according to a seventh aspect includes:
The power generation device according to any one of claims 1 to 6;
a turbine that rotates a rotor shaft, the turbine being connected to the generator included in the power generation device via the rotor shaft;
Equipped with.

This power generation system (1) can use an AC power supply that outputs low-power AC power and low-voltage AC voltage when generating a magnetic field for the generator to generate electricity based on the AC voltage of the AC power received by the rectifier of the main exciter.

(8) A power generation method according to an eighth aspect includes:
A power generation method performed by a power generation device including a first power source that outputs a power smaller than a power that can generate a first magnetic field, which is a magnetic field for generating power by a generator, and that is capable of outputting a first AC voltage,
When the first AC voltage is output from the first power supply, generating a DC voltage from the first AC voltage, and generating a second AC voltage from the generated DC voltage, the second AC voltage having a waveform closer to a sine wave than the first AC voltage;
generating AC power of a third AC voltage in a second magnetic field generated based on DC power generated from AC power of the second AC voltage;
generating AC power of a fourth AC voltage in the first magnetic field generated based on DC power generated from AC power of the third AC voltage;
Includes.

This power generation method can use an AC power supply that outputs low-power AC power and low-voltage AC voltage when generating a magnetic field for the generator to generate electricity based on the AC voltage of the AC power received by the rectifier of the main exciter.

(9) A program according to a ninth aspect includes:
A computer of a power generating device including a first power supply that outputs a power smaller than the power that can generate a first magnetic field, which is a magnetic field for generating power by the generator, and that can output a first AC voltage,
When the first AC voltage is output from the first power supply, generating a DC voltage from the first AC voltage, and generating a second AC voltage from the generated DC voltage, the second AC voltage having a waveform closer to a sine wave than the first AC voltage;
generating AC power of a third AC voltage in a second magnetic field generated based on DC power generated from AC power of the second AC voltage;
generating AC power of a fourth AC voltage in the first magnetic field generated based on DC power generated from AC power of the third AC voltage;
Execute the following.

This program allows the use of an AC power supply that outputs low-power AC power and low-voltage AC voltage when generating a magnetic field for the generator to generate electricity based on the AC voltage of the AC power received by the rectifier of the main exciter.

1... Power generation system 5... Computer 6... CPU
7: Main memory 8: Storage 9: Interface 10: Power generation device 20: Low-voltage power supply (first power supply)
30: Turbine 40: Rotor shaft 50: Low-voltage power supply (second power supply)
101... Generator 101a... First field winding 102, 104... Rectifier 103... Main exciter 103a... Second field winding 105... Power source reforming device (first device)
105a: Converter 105b: Inverter 106: Switching unit 107: Power source reforming device (second device)

Claims (8)

a first power supply that outputs a power smaller than the power that can generate a first magnetic field, which is a magnetic field for generating power by the generator, and that is capable of outputting a first AC voltage;
a first device that, when the first AC voltage is output from the first power supply, generates a DC voltage from the first AC voltage and generates a second AC voltage from the generated DC voltage, the second AC voltage having a waveform closer to a sine wave than the first AC voltage;
a main exciter that generates AC power of a third AC voltage in a second magnetic field that is generated based on DC power generated from AC power of the second AC voltage;
the generator generating AC power of a fourth AC voltage in the first magnetic field generated based on DC power generated from AC power of the third AC voltage;
a second power supply that outputs a power smaller than the power capable of generating the first magnetic field, and that is capable of outputting a fifth AC voltage that is the same low voltage as the first AC voltage, independently of the first AC voltage;
a second device that generates a DC voltage from the fifth AC voltage instead of the first AC voltage, and that is capable of generating a sixth AC voltage from the generated DC voltage, the sixth AC voltage having a waveform closer to a sine wave than the fifth AC voltage;
Equipped with
The second power source is
When the first AC voltage is not output from the first power supply, the fifth AC voltage is output.
Power generation equipment. a first field winding which is a coil of an electromagnet that generates the first magnetic field;
The power generating device according to claim 1 . a second field winding which is a coil of an electromagnet that generates the second magnetic field;
The power generating device according to claim 1 . a switching unit that switches between the first power source and the second power source;
The power generating device according to claim 1 . The second device is
generating a DC voltage from the fifth AC voltage, and generating a sixth AC voltage from the generated DC voltage, the sixth AC voltage having a waveform closer to a sine wave than the fifth AC voltage;
The power generating device according to claim 1 . The power generation device according to any one of claims 1 to 5 ;
a turbine that rotates a rotor shaft, the turbine being connected to the generator included in the power generation device via the rotor shaft;
A power generation system comprising: a first power supply that outputs a power smaller than the power that can generate a first magnetic field, which is a magnetic field for a generator to generate power, and that can output a first AC voltage ; and a second power supply that outputs a power smaller than the power that can generate the first magnetic field, and that can output a fifth AC voltage that is the same low voltage as the first AC voltage, independently from the first AC voltage, and that outputs the fifth AC voltage when the first AC voltage is not being output from the first power supply,
When the first AC voltage is output from the first power supply, generating a DC voltage from the first AC voltage, and generating a second AC voltage from the generated DC voltage, the second AC voltage having a waveform closer to a sine wave than the first AC voltage;
generating AC power of a third AC voltage in a second magnetic field generated based on DC power generated from AC power of the second AC voltage;
generating AC power of a fourth AC voltage in the first magnetic field generated based on DC power generated from AC power of the third AC voltage;
When the first AC voltage is not being output from the first power supply, a DC voltage is generated from the fifth AC voltage instead of the first AC voltage, and a sixth AC voltage having a waveform closer to a sine wave than the fifth AC voltage is generated from the generated DC voltage;
A method of generating electricity comprising: a first power supply that outputs a power smaller than the power that can generate a first magnetic field, which is a magnetic field for a generator to generate power, and that can output a first AC voltage ; and a second power supply that outputs a power smaller than the power that can generate the first magnetic field, and that can output a fifth AC voltage that is the same low voltage as the first AC voltage, independently from the first AC voltage, and that outputs the fifth AC voltage when the first AC voltage is not being output from the first power supply,
When the first AC voltage is output from the first power supply, a DC voltage is generated from the first AC voltage, and a second AC voltage having a waveform closer to a sine wave than the first AC voltage is generated from the generated DC voltage;
generating AC power of a third AC voltage in a second magnetic field generated based on DC power generated from AC power of the second AC voltage;
generating AC power of a fourth AC voltage in the first magnetic field generated based on DC power generated from AC power of the third AC voltage;
When the first AC voltage is not being output from the first power supply, a DC voltage is generated from the fifth AC voltage instead of the first AC voltage, and a sixth AC voltage having a waveform closer to a sine wave than the fifth AC voltage is generated from the generated DC voltage;
A program that executes the following.