JP2008263708A - Hydrogen-cooled generator system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydrogen-cooled generator system achieving efficient operation by adjusting hydrogen gas pressure for cooling, in accordance with the fluctuation of the operation power factor of a generator, thereby reducing windage loss. <P>SOLUTION: This hydrogen-cooled generator system, which has a hydrogen-cooled generator 1, a hydrogen gas cylinder 2 that supplies hydrogen gas for cooling, and a conduit 3 connecting the hydrogen bomb 2 with the inside of the hydrogen-cooled generator 1, has a pressure regulating valve 4 which regulates the pressure of hydrogen gas to be supplied into the hydrogen-cooled generator 1, being arranged in the middle of the conduit 3, a power factor detector 5 which detects the power factor, based on the output of the hydrogen-cooled generator 1, and a controller 6 which controls the pressure regulating valve 4 so that the pressure of hydrogen gas may be a predetermined pressure, based on the power factor detected by the power factor detector 5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hydrogen-cooled generator system, and is particularly useful when applied to the case where the pressure of the cooling hydrogen gas is adjusted in accordance with the power factor of the output of the hydrogen-cooled generator in the system.

  Equipment cooling is important in a turbine generator in which a large current flows through the field and the stator. In particular, in a large-capacity turbine generator used in commercial thermal power generation or nuclear power plants, in order to enhance the cooling effect, hydrogen is usually enclosed in equipment and used as a refrigerant. Such a hydrogen cooling system has various features such as excellent heat conduction, high cooling effect, low density, low windage loss, high insulation, and no oxidation / degradation of the constituent materials of the generator. Yes.

In the operation of a turbine generator including a hydrogen cooling generator system that employs a hydrogen cooling system, it is necessary to keep the stator current determined by the apparent power (VA) within a predetermined limit value of the device. However, when the power factor of the load is low, there are restrictions due to the following factors.
1) With a delayed power factor (inductive load), it is necessary to increase the field current even with the same output as the power factor decreases. Therefore, the output is limited by the current limitation of the field winding.
2) With the advance power factor (capacitive load), the field current is weakened even with the same output, but overheating due to magnetic flux concentration at the stator end and out-of-synchronization or out-of-synchronization (out of synchronization) In order to prevent this, the output is limited.

  Therefore, in an actual turbine generator, what takes the above into consideration is defined as a capacity characteristic curve, which is an important matter that must be taken into consideration during operation.

  Here, in the conventional hydrogen-cooled generator system using a hydrogen-cooled generator as a turbine generator, the pressure of the cooling hydrogen gas is determined based on a generator rated operating power factor of 0.9 pf. It is always operated at a sealing pressure of 0.41 MPa.

  As described above, the rated operating power factor of the hydrogen-cooled generator is 0.9 pf, but the actual operating power factor fluctuates from time to time depending on the state of the system, and is almost operated at 0.9 pf or more.

  Therefore, during the time except for summer when the generator operating power factor is low, the pressure adjustment valve of the hydrogen gas supply system is manually adjusted to operate at 0.38 MPa.

  Note that there is Patent Document 1 as a publicly known document disclosing a generator that performs hydrogen cooling.

Special Table 2000-503199

  In the above-described conventional technology, the pressure of hydrogen gas is simply adjusted in two periods, summer and other periods. Therefore, it was not operated at a reasonable hydrogen gas pressure that matched the operating power factor of the generator.

  In view of the above-described prior art, the present invention is a hydrogen cooling system capable of reducing windage loss and realizing efficient operation by adjusting the hydrogen gas pressure for cooling by following the fluctuation of the generator operating power factor. The purpose is to provide a generator system.

In order to achieve the above object, the first aspect of the present invention provides:
A hydrogen-cooled power generator, a hydrogen gas cylinder that supplies hydrogen gas for cooling to the hydrogen-cooled power generator, and a hydrogen gas for cooling the field or stator to the interior of the hydrogen-cooled power generator. In a hydrogen-cooled generator system having a hydrogen cylinder and a pipe line communicating between the interior of the hydrogen-cooled generator,
A pressure regulating valve that is arranged in the middle of the pipeline and that regulates the pressure of the hydrogen gas supplied into the hydrogen-cooled generator;
Power factor detecting means for detecting the power factor based on the output of the hydrogen cooled generator;
Control means for controlling the pressure regulating valve so that the pressure of the hydrogen gas becomes a pressure determined in advance based on the power factor detected by the power factor detection means. In the machine system.

The second aspect of the present invention is:
In the hydrogen-cooled generator system described in the first aspect,
Furthermore, while having an output detection means for detecting the output of the hydrogen-cooled generator, the control means controls the pressure regulating valve so as to have a predetermined pressure based on the power factor and the output. The hydrogen-cooled generator system is configured as described above.

The third aspect of the present invention is:
In the hydrogen-cooled generator system described in the first or second aspect,
The power factor detection means calculates a predetermined power factor by using a detection result of an active power meter that detects an active power of a bus for extracting an output of the hydrogen-cooled generator and a reactive power meter that detects a reactive power. In the hydrogen-cooled generator system, which is characterized by

  According to the present invention, the gas pressure of the cooling hydrogen can be appropriately maintained by automatically adjusting the pressure regulating valve based on the generator operating power factor. As a result, it is possible to perform a rational power generation operation in which windage loss is reduced as much as possible, and to maintain the required hydrogen gas pressure, so that wasteful consumption of hydrogen gas can be suppressed.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing a hydrogen-cooled generator system according to an embodiment of the present invention. As shown in the figure, a hydrogen-cooled generator system according to this embodiment includes a hydrogen-cooled generator 1, a hydrogen gas cylinder 2 that supplies hydrogen gas for cooling to the hydrogen-cooled generator 1, and a hydrogen-cooled generator 1 And a pipe line 3 communicating between the inside of the hydrogen cooling generator 1 and the hydrogen gas cylinder 2 so as to supply hydrogen gas for cooling the field or stator. A pressure adjusting valve 4 for automatically adjusting the pressure of the hydrogen gas supplied to the inside of the hydrogen cooled generator 1 is disposed in the middle of the pipe line 3.

  The power factor detector 5 detects the power factor based on the output of the hydrogen cooled generator 1. Specifically, for example, a predetermined power factor is calculated using detection results of an active wattmeter that detects the active power of the bus for extracting the output of the hydrogen-cooled generator 1 and a reactive wattmeter that detects reactive power. It can be suitably configured. However, the present invention is not limited to this, and if it is an effective voltage and an ineffective voltage in the power plant premises, a measured value with a predetermined accuracy can be obtained, so that these data can be used effectively for calculation.

  In the control device 6, the pressure of the hydrogen gas becomes an optimum pressure determined in advance based on the power factor detected by the power factor detector 5 and the output power of the hydrogen cooling generator 1 detected by the output meter 7. Thus, the opening degree of the pressure regulating valve 4 is automatically adjusted. Here, the output power detected by the output meter 7 is active power (W) obtained by multiplying the apparent power (VA) by the power factor (pf). Here, the output voltage is not necessarily a control parameter. A predetermined effect can also be obtained by simply adjusting the gas pressure of hydrogen gas based on the power factor (pf). However, there is no doubt that high-precision optimal control can be achieved with the output voltage taken into account.

FIG. 2 is a characteristic diagram showing the relationship of the hydrogen gas pressure with respect to the output, reactive power, and power factor of the hydrogen-cooled generator in this embodiment. In such a characteristic diagram, the horizontal axis represents output power (MW), the vertical axis represents reactive power (MVAR), the thick line represents hydrogen gas pressure (kg / cm ² ), and the thin line represents power factor (pf).

  Each data represented in the characteristic diagram is stored in the control device 6 as map data. The control device 6 determines the hydrogen gas pressure based on the measured data of the power factor detector 5 and the output meter 7, and the gas pressure The opening of the pressure regulating valve 4 is adjusted so that

  In this embodiment, the opening degree of the pressure regulating valve 4 is adjusted so as to be an optimum hydrogen gas pressure based on the generator power factor and the output of the hydrogen cooled generator 1. Accordingly, hydrogen gas having an optimum pressure corresponding to the output and power factor is supplied into the hydrogen-cooled generator 1. That is, the hydrogen gas pressure is automatically adjusted by continuous adjustment without steps.

  As a result, it is possible to perform a rational power generation operation with the windage loss reduced as much as possible. At the same time, it is sufficient to maintain the required hydrogen gas pressure, so that wasteful consumption of hydrogen gas can be suppressed.

  INDUSTRIAL APPLICABILITY The present invention can be used in an industrial field where electric power is supplied using a power generation facility or an industrial field where the facility is manufactured and sold.

It is a block block diagram which shows the hydrogen cooling generator system which concerns on embodiment of this invention. It is a characteristic view which shows the relationship of the hydrogen gas pressure with respect to the output of the hydrogen cooling generator in embodiment shown in FIG. 1, reactive power, and a power factor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hydrogen cooling generator 2 Hydrogen gas cylinder 3 Pipe line 4 Pressure regulating valve 5 Power factor detector 6 Control apparatus 7 Output meter

Claims (3)

A hydrogen-cooled power generator, a hydrogen gas cylinder that supplies hydrogen gas for cooling to the hydrogen-cooled power generator, and a hydrogen gas for cooling the field or stator to the interior of the hydrogen-cooled power generator. In a hydrogen-cooled generator system having a hydrogen cylinder and a pipe line communicating between the interior of the hydrogen-cooled generator,
A pressure regulating valve that is arranged in the middle of the pipeline and that regulates the pressure of the hydrogen gas supplied into the hydrogen-cooled generator;
Power factor detecting means for detecting the power factor based on the output of the hydrogen cooled generator;
Control means for controlling the pressure regulating valve so that the pressure of the hydrogen gas becomes a pressure determined in advance based on the power factor detected by the power factor detection means. Machine system. In the hydrogen cooled generator system according to claim 1,
Furthermore, while having an output detection means for detecting the output of the hydrogen-cooled generator, the control means controls the pressure regulating valve so as to have a predetermined pressure based on the power factor and the output. A hydrogen-cooled generator system characterized by being configured as described above. In the hydrogen-cooled generator system according to claim 1 or 2,
The power factor detection means calculates a predetermined power factor by using a detection result of an active power meter that detects an active power of a bus for extracting an output of the hydrogen-cooled generator and a reactive power meter that detects a reactive power. A hydrogen-cooled generator system characterized by