JPS6233823B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power supply device for supplying power to an intermittent load in nuclear fusion, etc., and particularly to a power supply device for effectively supplying coil energy from a superconducting energy storage coil to a load. be.

A conventional device of this type is shown in FIG. In the figure, 1 is a superconducting energy storage coil (superconducting coil), 2 is a coil as a load, and 3 is a self-excited DC-AC-DC thyristor converter for effectively transmitting the energy of superconducting coil 1 to load 2. . The self-excited DC-AC-DC thyristor converter 3 includes thyristor bridges 4 and 5.
and these two thyristor bridges 4 and 5
and a commutating capacitor 6 connected in delta between the two. The conduction of thyristor bridges 4 and 5 is controlled by gate control circuits 7 and 8, respectively.

Next, the operation will be explained. Self-excited DC-AC-
As the name suggests, the DC thyristor converter 3 is a converter in which the input and final output are each DC, and the intermediate output is AC, and the three-phase AC output as the intermediate output is used for commutation. This occurs between each terminal of the capacitor 6. The waveform of one phase of this three-phase alternating current is shown in FIG. As shown in Figure 2, the three-phase AC output does not form a smooth sine wave.

Gate control circuits 7 and 8 connected to the gate terminals of each thyristor constituting thyristor bridges 4 and 5 of this DC-AC-DC thyristor converter 3 are configured such that the inputs of thyristor bridges 4 and 5 are DC. When the thyristor bridge is used as an inverter, it acts as a frequency control circuit, and when the input to the thyristor bridge is alternating current and it is used as a converter, it acts as a phase angle control circuit. Therefore, the gate control circuit 7 sequentially supplies a trigger signal to the gate terminal of each thyristor of the thyristor bridge 4 at an appropriate period to fire each thyristor, thereby converting a DC input into an AC output. Moreover, by changing the period of the trigger signal, the frequency of this AC output can be adjusted and controlled.

Furthermore, the gate control circuit 8 arbitrarily changes the firing timing of each thyristor of the thyristor bridge 5 by changing the phase angle γ, thereby converting an AC input into a DC output, and changing the phase angle γ. This makes it possible to continuously adjust and control the DC output value.

In the superconducting energy transfer system shown in Fig. 1, the inverter operates as a current type, and in order to control the commutation voltage, it is necessary to control the firing angle and conduction time of the inverter, and as a result, the commutation capacitor The AC output generated between each terminal has an uneven waveform as shown in Figure 2 above, so establishing the commutation voltage that ensures reliable commutation operation of the converter relies only on the control system. This had the disadvantage that it was not possible to supply power to multiple rectifiers.

This invention was made to eliminate the drawbacks of the conventional ones as described above, and it connects a commutating reactor in parallel with a commutating capacitor, generates a commutating voltage in a sine wave shape, and controls the voltage by frequency control. It is an object of the present invention to provide a power supply device that can establish a commutated voltage by controlling the power supply device and can supply power to a plurality of rectifiers.

Hereinafter, one embodiment of the present invention will be described based on the drawings. In FIG. 3, a storage coil charging circuit REC is provided between the superconducting energy storage coil 1 and the inverter 4, and this charging circuit
Bypass switch BS1 is connected in parallel with REC, and inverter 4 and bypass switch
BS2 is connected. An L-C parallel resonant tank circuit 6' for generating commutation voltage is connected to the output side of the inverter 4, and this is connected in parallel with each capacitor of the commutation capacitor 6 shown in FIG. It is configured by connecting reactors. The output side of the inverter 4 is further connected to corresponding loads 2 via a plurality of rectifiers 5'. In this case, a poloidal power supply system (multiple loads) of a tokamak device is assumed as the load, and each rectifier 5' is paired so that power can be supplied from either the positive or negative side.

When storing energy in the storage coil 1 in the above configuration, the storage coil 1 is energized by the charging circuit REC, and the bypass switch BS2 is turned on to charge the storage coil 1 while bypassing the inverter 4.

When supplying energy from storage coil 1 to each load coil 2, first switch bypass switch BS1.
After turning on and disconnecting the charging circuit REC on the grid side, the inverter 4 is operated, and the bypass switch BS2 is turned off to generate a three-phase sine wave voltage in the L-C resonance tank circuit 6', and multiple The rectifier 5' is energized.

In the embodiment shown in Fig. 3, the operating frequency of the inverter 4 is 240Hz, and the rectifier 5' is a 240Hz three-phase full-wave rectifier in order to make the ripple and response to each load coil equivalent to a 60Hz 24-phase rectifier. shall be.

In the above embodiment, a coil is used as the load, but in general, a direct current load will produce the same effect.

As described above, according to the present invention, the commutation circuit is
Since it is configured with a C resonant circuit, the commutated voltage of the converter can be generated in the form of a sine wave, and since the operation is a voltage type operation, there is an effect that power can be supplied to a plurality of coil loads.

In addition, when this type of superconducting energy operation system is used as a replacement for a flywheel generator, according to the present invention, by using a voltage type transfer system with an L-C resonant circuit, it is closer to the actual one. This has the effect of realizing a power supply device.

[Brief explanation of the drawing]

FIG. 1 is a circuit configuration diagram showing a conventional superconducting energy transfer system, FIG. 2 is a waveform diagram for explaining the operation of FIG. 1, and FIG. 3 is a superconducting energy transfer system according to an embodiment of the present invention. FIG. 3 is a circuit configuration diagram. In the figure, 1 is a superconducting energy storage coil, 2 is a storage coil charging circuit, 4 is an inverter, 5' is a rectifier, and 6' is an L for commutation voltage generation.
-C parallel resonant tank circuit. In addition, in each figure,
The same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] 1 Superconducting energy from a superconducting energy storage coil is transferred to a self-excited DC with a commutation capacitor.
- In a power supply device for supplying power to intermittent loads via an AC-DC thyristor converter, power can be supplied to multiple loads by replacing the commutation capacitor with an L-C parallel resonant tank circuit for commutation voltage generation. A power supply device characterized by: