JPS5824920A - Power source controller - Google Patents

Abstract

PURPOSE:To perform rising of a load with high accuracy, by providing a feedback loop of load voltage in a field weakening control circuit of a power generator and by setting the voltage of the basis on the load voltage and the voltage measured value in a controller of a power source device peforming excitation of magnetic field coils of which a nuclear fusion device is constituted. CONSTITUTION:A voltage detector 12 detecting coil voltage, a current detector 13 detecting coil current and an operation setting device 15 deriving the setting of the coil voltage by an operation are provided to a troidal coil 1. To control the coil current, the set value of the coil voltage is operated at the setting device 15 on the bisis of the measured value by detectors 12, 13. The deviation signal between a feedback signal from the detector 12 obtained through an amplifier 14 and the set signal of the setting device 15 is amplified 9, and an output of a thyristor exciting device 10 is controlled by the deviation signal and an output of a generator 2 is controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to, for example, a control device for a power supply device that excites a magnetic field coil that constitutes a nuclear fusion device.

Hereinafter, both the conventional power supply and the embodiment of the present invention will be explained using a toroidal magnetic field coil power supply as an example.

BACKGROUND ART Conventionally, as shown in FIG. 1, there is a device of this type that excites a coil, which is a load, by controlling a generator voltage.

In the figure, (1) is a toroidal magnetic field coil (hereinafter simply referred to as a coil) that serves as a load, and (2) is this coil f.
i/(1) is a generator that supplies power, (3) is a transformer that steps down the output of this generator, and (4) is the AC power of generator (2) that is supplied via this transformer. A rectifier that rectifies and supplies DC power to the coil (1), (5) is an instrument transformer that detects the output voltage of the generator (2), and (6)
) is a signal amplifier that amplifies the secondary output of this potential transformer, (7) is a voltage setting device that sets the output voltage of the generator (2), (8) is a signal adder, and (9) is this signal amplifier. A deviation amplifier that amplifies the output of the signal adder, QG is a thyristor excitation circuit that supplies an output corresponding to the output of this deviation amplifier to the field (2a) of the generator (2), and αυ is a transformer for the power supply voltage (not shown). , a transformer that supplies the thyristor excitation circuit QQ.

The one shown in FIG. 1 controls the output voltage of a generator (1) to a predetermined value and excites the carp /I/ (1).

That is, the output voltage of the generator (2) is transformed by the instrument transformer (5) and inputted to the signal adder (8) via the signal amplifier (6). On the other hand, the signal adder (8) also inputs the set value of the generator voltage set in the voltage setting device (7), and the signal adder (8) derives a deviation signal between the two. The signal is input to the thyristor excitation circuit αq via the signal amplifier (9). The thyristor excitation circuit QO adjusts the field (2a) so that the deviation signal becomes zero, and the generator (
The output voltage of step 2) is controlled to the set value set in the voltage setting device (7). The thus controlled generator voltage is supplied to the rectifier (4) via the transformer (3), converted into a DC voltage, and excites the coil /I/ (1).

By the way, the current Ie of the toroidal magnetic field coil, as shown in FIG.
It is necessary to maintain the current value for a predetermined time T-.

In Fig. 1, the voltage of the generator, which is controlled to the required voltage by adjusting the field (2a), is stepped down to an appropriate voltage by the transformer (3), and is further passed through the rectifier (4) to the DC voltage. , and excites the carp/L' (1).

When controlling the rise of the coil current flowing into the coil (1) using the generator voltage constant control as described above, the generator voltage V, coil voltage 75d, and coil current 4 are set as shown in Fig. 8 1a). , lbl, ic).

When starting up the coil current, give the voltage setter (7) a set value v1 of the generator voltage so that the set current value is reached at the set time, and set the generator (2). Control voltage. When the coil current d reaches the set current F, in order to keep the coil fi/current constant at the current F, the setting value of the voltage setting device (7) is changed to H, and the coil current is kept constant for a predetermined period of time. Keep it.

However, a voltage drop occurs in the coil voltage according to the current of the coil, which is a load. Therefore, in order to ramp up the coil current at a predetermined time, a circuit that accurately predicts and compensates for the voltage drop is required. Furthermore, since the coil resistance value changes depending on the temperature of the coil conductor, it is necessary to compensate for these changes and control the coil iV current with high accuracy.
Have difficulty. Another possible method is to perform feed-pack control on the coil current, but in a control system for a circuit that has two large time constants, such as a generator and a coil, the coil current may be controlled relative to the set value. It is difficult to control accurately and stably.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above.
A pack loop is provided, and the voltage setting value is given after correcting resistance fluctuations based on the measured values of load current and load voltage. Starts up the load with high accuracy regardless of resistance value fluctuations,
Furthermore, it provides a control device that can be maintained.

An embodiment of this invention is shown in FIG. In Figure 4,
(2) is a voltage detector that detects the coil voltage, (to) is a current detector that detects the coil current, a4 is an amplifier for the coil voltage detection signal, and (g) is the coil voltage setting derived by calculation. It is a calculation setting device.

Note that the other configurations are similar to those shown in FIG. 1.

Next, the operation when controlling the coil current according to the present invention will be explained. In Figure 4, voltage detector (2)
Based on the measured value by the current detector (2), the set value of the coil voltage is calculated in the calculation setting device (to) by means described later. The deviation signal between the feed pack signal from the voltage detector (2) obtained via the amplifier 04 and the setting signal of the setting device (G) is amplified by the amplifier (9), and the deviation signal is used to control the thyristor excitation device QQ. Adjust the output and control the output of the generator (2).

The set value of the coil voltage is corrected every ΔY seconds as shown in FIG. First, based on the measured values of voltage and current in a certain time period, the resistance value of the carp μ at the same time is determined. Next, during the remaining start-up period, set current F
Find the coil voltage required to start up to. The voltage value thus obtained is given as the voltage setting value of the field control circuit for each time segment.

An example of a procedure for calculating a voltage setting value using the above control method will be shown. In the first time segment, the resistance value can be expressed as follows.

1+n - No. 11 Δt 1 (da ma: Voltage value at the end of the 1st time period, average value of the voltage values at the end of the 11th time period.

ldk: Current value fah-1 at the end of the first time period
: 1st -1 Δt : 1 time segment L : The resistance value change of the inductance coil is obtained for each time υ by applying the above formula. Next, the resistance value Rk before 1 hour division
If -1 is calculated, it remains. Coil 1 required to raise the set current IP during startup time
Find the v voltage as follows.

τh-t: L/Rk-1Δt: 1 time segment tr: Start-up time By giving the voltage value obtained in this way as the setting voltage value for field control for each time segment, the coil current can be controlled. Ru.

In addition, in the above example, the resistance value is determined for each time period,
Although we have shown a control method in which the coil voltage setting value is calculated and given, since the absolute values of the current and voltage are small at the beginning of the rise of the coil/I' current, the detection error becomes relatively large. Unable to predict values. Therefore, in the initial stage of startup, there are certain time divisions, carp/
A method may also be considered in which the L/M pressure set value is held. Further, since the coil voltage fluctuates greatly during the transition from the coil current rise to the current maintenance, and the calculation of the resistance value becomes inaccurate, a method may be considered in which the voltage setting value is gradually changed during this period.

In the above embodiments, the load is a toroidal magnetic field coil as an example, but the present invention is not limited to this, and any load having a relatively large time constant may be used.

As described above, according to the present invention, the change in the actual resistance value of the load is corrected by the set value of the load voltage, and since the coil voltage is controlled, it is not affected by the voltage drop in the rectifier circuit. To start up the coil current with high precision,
Maintenance can be controlled.

[Brief explanation of the drawing]

FIG. 1 is a control circuit diagram of a conventional toroidal magnetic field coil power supply, FIG. 2 is a diagram showing a control pattern of a toroidal magnetic field coil current, and FIG. 8 is a characteristic diagram showing control characteristics in a conventional control circuit. FIG. 4 is a control circuit diagram according to an embodiment of the present invention, and FIG. 6 is a diagram showing a control pattern when controlled by the control circuit of the present invention. (1)... Toroidal magnetic field coil, (2)... Generator, (3)... Transformer, (4)... Rectifier, (5
)...Instrument transformer, (7)...Voltage setting device, QG
... Thyristor excitation circuit, (2) ... Voltage detector,
α: Current detector, (to)... Calculation setting device. In each figure, the same reference numerals indicate the same or corresponding parts. Agent Makoto Kuzuno (and 1 other person) Figure 1 Figure 3 Continued from page 1 Application of Article 30, Paragraph 1 of the Patent Act (2) Materials distributed on the day of the February 5, 1980 lecture (Pb-
Presented at 3-10 JT-60t-Loidal Magnetic Field Coil Power Supply System (Simulation)0 Inventor: Shunji Sato Inside Mitsubishi Electric Corporation Control Manufacturing Works, 1-1-2 Wadazaki-cho, Hyogo-ku, Kobe ■Applicant: Mitsubishi Electric Co., Ltd. Company 2-2-3 Marunouchi, Chiyoda-ku, Tokyo

Claims (1)

[Claims] Rectifying the output of the power supply in a device that controls the power supply to adjust the output of the power supply to be controlled so that the load current supplied to the load with a large time constant rises to a set value in a predetermined period. and a rectifier that supplies power to the load, a voltage detector that detects the load voltage applied to the load, a current detector that detects the load current flowing to the load, and detection of the voltage detector and current detector. value, calculate the resistance value of the load at that time, and based on the resistance value, calculate the load voltage value necessary to raise the load current to the set value by a predetermined time point, sequentially for each arbitrary time interval. A power supply control device comprising: a calculation setting device that derives the load voltage value; and a device that controls the output of the power supply device in accordance with load voltage values sequentially derived by the calculation setting device.