JPS58127528A - Generator facility - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to power generation equipment in which a superconducting generator having a superconducting field winding is configured to control voltage when applied to a power system.

[Technical background of the invention]

In recent years, superconducting generators with field windings in a superconducting state are expected to be smaller, lighter, and larger in capacity, and because their synchronous reactance is extremely small, they are being applied to power systems to improve round-field stability. You can expect to do so. For this reason, research into superconducting generators continues in many countries, but no practical equipment has entered commercial operation, and one notable feature is expected to be an extremely large field time constant. ing. this is,
Since the resistance of the superconducting field winding is zero, the circuit DC resistance is extremely low even considering the resistance of some normal conducting parts such as the lead-out leads, and the inductance component generates a strong magnetic field. is large and the value of 4 becomes large.
For example, in a 300 MVA class, the value of 'r': 16 is considered to be about 5 seconds in a normal conductor, but it can reach 800 seconds.

[Problems with background technology]

Looking at this in the other way, if you try to adjust the stain pressure by excitation control in a superconducting generator, the normal method would take too much time to be of practical use, and tb voltage control would be impossible. It can be said that. Furthermore, in order to make the peak voltage extremely high and change the magnetic field rapidly, there are many technical problems that need to be solved, such as how to prevent the loss of superconductivity, so-called quench phenomenon.

As mentioned above, in its current state, it is difficult to connect superconducting generators to an actual system and put them into practical use.

[Purpose of the invention]

The present invention was made in order to solve the above-mentioned problems, and its purpose is to provide power generation equipment that can be applied to an actual system by making it possible to control the voltage of a superconducting generator whose voltage control is impossible or extremely difficult. Our goal is to provide the following.

[Summary of the invention]

In order to achieve the above object, the present invention provides a power generation facility in which a plurality of generators driven by a prime mover of a turbine bed are configured to be able to operate in parallel. The generator is characterized in that the normal conduction generator is configured to be excitation-controlled so that the voltage of the entire generator group becomes a predetermined value.

[Embodiments of the invention]

An embodiment of the present invention shown in the drawings will be described below.

In addition, here, a Crossco/I-land type power generation facility will be described as an example.

FIG. 1 is a diagram showing an example of the configuration of a shaft system of a power generation facility according to the present invention, and FIG. 2 is a diagram similarly showing an electric circuit connection configuration. In the figure, medium and high pressure steam turbines IP, HP and low pressure steam turbines LP-z, Lp- are used as prime movers.
2 consists of two axes, primary and secondary,
! The superconducting generator G is directly connected to the primary shaft, and the normal-conducting generator G2 is directly connected to the secondary shaft to form a cross-conductor round turbine power generation facility. Here, each of the generators Gl and G2 has a superconducting field winding IPI and a normal conducting field winding F2, and in particular, the superconducting field winding F is short-circuited by the superconducting wire after initial excitation is completed, resulting in a permanent short circuit. Allows current to flow. Therefore, in this state, the generator G1 is equivalent to a large permanent magnet generator. Further, the generators Gl and G2 are connected to each other through phase-separated busbars so as to be able to operate in parallel, and are connected to a power system (not shown) via a main transformer Tr.

On the other hand, the AVR is an automatic voltage regulator that receives the output current and voltage of the normal conduction generator G2 detected by the current and voltage transformers CT and PT as input, and adjusts the voltage of the entire power generator group to a predetermined value. , an excitation current is supplied to the normally conducting field winding F2 via the Cyrisk converter SCR, i) the normally conducting generator G2;
is configured to control excitation.

It is assumed that in such a cross-conductor/four-round turbine power generation facility, a superconducting generator G1 and a normal-conducting generator G2 are operated in parallel. In this state, if the load on the power system changes (increases), the terminal voltage of superconducting generator G1 changes (decreases), but each generator G J r G 2 is connected to the phase-separated bus bar. Therefore, when two generators G rpa x are operated in parallel as a cross-connected machine, the normal conduction generator 02 is controlled to excite via the thyristor converter 80R by the automatic voltage regulator A. Especially, voltage fluctuation (drop) of superconducting generator G1
As a result, the terminal voltage of the entire generator group is controlled to a predetermined value. In other words, it can be considered that reactive power corresponding to the voltage drop of the superconducting generator GI flows into the normal conductive generator 02 as a circulating current.

In this way, medium and high pressure steam turbine I as a prime mover
P, HP and low pressure steam turbine LP-1゜LP-
J is a cross-conductor armature turbine power generation facility consisting of two shafts, an f2 primary shaft and a secondary shaft, in which the superconducting generator 01 is directly connected to the primary shaft, and the normal conductive generator 02 is directly connected to the secondary shaft, and they are operated in parallel. (by the AVR) via the thyristor converter SCR, so that the voltage of the entire generator group is a predetermined value.
It is configured to control the excitation of the normal conduction generator G2.

Therefore, it is possible to perform voltage control that is impossible or extremely difficult with a single superconducting generator G, and can be easily applied to an actual system and has extremely high reliability.

In the above embodiment, the superconducting generator G1 is installed on the primary shaft.
, the normal conduction generator G2 was directly connected to the secondary shaft, but it was the other way around! The normal-conducting generator G2 may be directly connected to the primary shaft, and the superconducting generator G1 may be directly connected to the secondary shaft.

In addition, although the above mentioned the cross-conductor/mother-conductor system, in cases where multiple generators are synchronized at low voltage, such as the non-combined cycle system, at least one normal-conducting generator and a superconducting generator are used. It may also be configured by combining machines.

In addition, the superconducting generator @Fl was described as a method in which the superconducting wire is short-circuited and a permanent short-circuit current continues to flow, but a normal-conducting wire is connected and the excitation current for the loss is continuously supplied through a thyristor converter. In addition, we installed an automatic voltage regulator (mu), which responds to the superconducting generator 01 at a slow rate, and expects the AVB effect of the superconducting generator G1 to respond to slow fluctuations in the power system, and to prevent rapid fluctuations. In response, the AVR of the normal conduction generator G2 will mainly respond. It is also possible to configure

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to provide extremely reliable power generation equipment that enables voltage control of superconducting generators for which voltage control is impossible or extremely difficult, and that can be easily applied to actual power systems.

[Brief explanation of the drawing]

FIGS. 1 and 2 are configuration diagrams showing one embodiment of the present invention. HP, IP, LP-J・LP-! ...High, medium, and low pressure steam turbines, G1...Superconducting generator, G2...Normal conducting generator, Fl, F2...Field winding, CT, F T
...Current, voltage transformer, 7r...Main transformer, AVR
...Automatic voltage adjustment equipment, SCR...Thyristor converter.

Claims (1)

[Claims] In a power generation facility in which a plurality of generators driven by a prime mover such as a turbine are configured to be able to operate in parallel, the generator is composed of at least one normal-conducting generator and a superconducting generator, and the entire generator group is A power generation facility characterized in that the normal conduction generator is controlled in excitation so that the voltage of the generator becomes a predetermined value.