JP2649443B2 - Power supply device and particle accelerator using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device, and more particularly to a power supply device suitable for exciting a main electromagnet of an elementary particle accelerator such as a proton synchrotron at high speed and with high accuracy, and a particle accelerator using the same. .

[0002]

2. Description of the Related Art In a synchrotron particle accelerator, an electromagnet is used to control the orbit of a particle.
A power supply device for exciting the electromagnet of such a synchrotron particle accelerator is characterized by handling large power, rapidly changing a load current and a voltage in a fixed pattern, and repeatedly operating, and having high accuracy and High-speed controllability is required. As a power supply for exciting such an electromagnet,
For example, there is one described in Hitachi Review (Vol. 60, No. 10, pp. 739-744 "Proton Synchrotron Main Electromagnet Power Supply Controller"). In this power supply device, the configuration of an AVR (voltage control circuit), which is a voltage control system for performing voltage control using an output signal of an ACR (current control circuit), which is a current control system, as a voltage set value, is a proportional system (0 type system) or It was an integral system (type 1 system).

[0003]

In the conventional power supply device described above, the AVR as a voltage control system for performing constant voltage control is used.
(Constant voltage control circuit) is proportional system (0 type system) or integral system (1
However, there is a problem that the recovery characteristic of the output voltage is poor because of the type, and the fluctuation of the load current becomes large when a voltage disturbance occurs.

Since the load current is finally controlled based on the output of the voltage control system, when the load current is changed by the current control system, the current control for the load is caused due to the response delay of the voltage control system. There is a problem that the responsiveness of the device is reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is possible to suppress a change in load current with respect to a voltage disturbance, and to respond to a current set value given to a current control system. It is an object of the present invention to provide a high-precision power supply device capable of high-speed response with little delay.

Another object of the present invention is to provide a particle accelerator using the power supply device.

[0007]

A power supply device according to the present invention has a switching element, converts alternating current to direct current, and supplies a direct current voltage to a load, and a current command based on a current pattern flowing to the load. Current command generating means for generating
A current control means for inputting a deviation between the current command and the load current detection value, generating and outputting an output voltage command of the AC / DC conversion means required for removing the deviation, and a voltage command and an output voltage detection of the AC / DC conversion means A voltage control means for inputting a deviation from the value and generating and outputting an ignition phase angle command of the AC / DC conversion means necessary for removing this deviation, and a switching element of the AC / DC conversion means based on the ignition point angle command. Control means for controlling the output of the AC / DC conversion means by controlling, wherein the voltage control means integrates the deviation and further performs a proportional integral of the integrated value.

Further, in the power supply device according to the present invention, the current command generating means is characterized in that the bent portion of the current pattern to be set is formed using a cubic spline function that is continuous up to the second derivative.

Further, in the power supply device according to the present invention, the voltage pattern of the output voltage of the AC / DC converter corresponding to the current pattern is obtained by calculation using the current pattern set by the current command generator and the load characteristic constant. A voltage advance command generation means for generating an output voltage advance command based on a pattern is provided, and the output voltage advance command is added to an output voltage command generated by the current control means.

Further, the power supply device of the present invention has a switching element and has an AC / DC converting means for converting an AC to a DC and outputting the DC, and detects a pulsating component of an output voltage of the AC / DC converting means, and detects the pulsating component in reverse. An active filter that generates a phase voltage and superimposes it on a signal on the output side of the AC / DC converter; a current command generator that generates a current command based on a current pattern flowing to the load; And a current control means for generating and outputting an output voltage command of the AC / DC conversion means necessary for removing the difference, and inputting a difference between the voltage command and an output voltage detection value of the AC / DC conversion means. By controlling the switching element of the AC / DC converter on the basis of the voltage control means for generating and outputting the insulated phase angle command of the AC / DC converter required for removing this deviation, and outputting the command. And control means for controlling the output of the AC-DC conversion means, voltage control means integrates the deviation,
Further, the integral value is proportionally integrated, and a voltage obtained by subtracting the output voltage command input to the voltage control means from the output voltage of the AC / DC conversion means is input to the active filter.

The particle accelerator according to the present invention includes a particle generator for generating particles, a pre-accelerator for accelerating particles generated by the particle generator to a predetermined energy level, and a main electromagnet for accelerating the particles accelerated by the pre-accelerator. In a particle accelerator having a final-stage accelerator for applying predetermined particle energy by being accelerated by a high-frequency acceleration cavity while orbiting, and a power supply for exciting a main electromagnet, the power supply has a switching element and converts AC to DC. AC / DC conversion means for converting and supplying a DC voltage to the load, and a deviation between the current command and the load current detection value are inputted, and an output voltage command of the AC / DC conversion means required for removing the deviation is generated and output. Current control means,
A voltage control means for inputting a deviation between the voltage command and the output voltage detection value of the AC / DC conversion means, generating and outputting an ignition phase angle command of the AC / DC conversion means necessary for removing the deviation, Control means for controlling the output of the AC / DC conversion means by controlling the switching element of the AC / DC conversion means based on the command, wherein the voltage control means integrates the deviation and further proportionally integrates the integrated value. It is characterized by having.

[0012]

In the power supply device having the above-described structure, the voltage control means as the voltage control system captures a deviation between the output voltage command generated by the current control means and the output voltage detection value of the AC / DC conversion means, and at least detects the deviation. Since the second-order integration processing is performed and the output is output as the output voltage command of the AC / DC converter, the response can be improved, the voltage disturbance can be suppressed rapidly, and the output current (load current) caused by the voltage disturbance can be suppressed. )
Can be made extremely small.

Further, in the power supply device of the present invention, the current pattern output by the current command control means is formed by a cubic spline function whose bent portion is continuous up to the second derivative. Therefore, the voltage set value given by the current control means becomes smooth, so that the transient deviation due to the response delay of the voltage control means becomes small, and the current pattern given by the current command control means to the constant current control means and the load current become smaller. Transient deviation can be reduced.

Further, in the power supply device of the present invention, the voltage advance command generation means uses the current pattern set by the current command generation means and the load characteristic constant to change the voltage pattern of the output voltage of the AC / DC conversion means corresponding to this current pattern. An output voltage advance command is obtained by calculation and based on this voltage pattern. This output voltage advance command is added to the output voltage command of the AC / DC conversion means generated by the current control means. Therefore, since the load current can be changed by the feedforward control, a high-speed response to the current pattern can be achieved.

Further, in the power supply device of the present invention, the active filter detects a voltage pulsation included in the output voltage of the thyristor converter as the AC / DC converter, and generates a voltage having a phase opposite to the voltage pulsation to generate the AC / DC conversion. Superimposed on the signal on the output side of the means. Thereby, voltage pulsation included in the output voltage of the AC / DC converter can be suppressed. Here, a voltage obtained by subtracting the output voltage command generated by the current control means input to the voltage control means from the output voltage of the AC / DC conversion means is input to the active filter. Therefore, the active filter does not operate for the voltage change due to the current control that operates according to the change in the current command value, and the operation can be stabilized.

According to the particle accelerator of the present invention, the main electromagnet is excited with a predetermined current and voltage pattern by the power supply having high accuracy and high speed response having the above-described configuration, thereby accurately maintaining the orbit of the particles. However, the particles can be accelerated to a predetermined energy level in a stable state in a short time.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of an embodiment of the power supply device according to the present invention. In FIG. 1, a power supply device includes a thyristor converter 1 (AC / DC converter) for converting AC power to DC power, a DC filter 2 for smoothing an output voltage of the thyristor converter 1, and a thyristor via the DC filter 2. A current detector 4 for detecting a current (load current) i supplied from the converter 1 to the electromagnet 3 as a load;
Control circuit 5 (current control means) operating based on
A voltage control circuit 6 (voltage control means) for setting an output of the current control circuit 5 to a voltage set value; and controlling a control angle of each thyristor constituting the thyristor conversion device 1 based on an output voltage of the voltage control circuit 6. It mainly comprises an automatic pulse phase shifter 7.

The voltage control circuit 6 comprises an integral operation circuit 61 for integrating the output signal of the adder 8 and a proportional integral operation circuit 62 for proportionally integrating the output signal of the integral operation circuit 61. (Type 2 system). FIG. 2 shows a block diagram in which a control system including the voltage control circuit 6, the automatic pulse phase shifter 7, and the thyristor converter 1 is represented by a transfer function. K3 gain in FIGS. 1 and 2, omega ₀ is the resonant frequency, the ζ damping constant, s is the Laplace operator, w is the voltage disturbance. The response speed can be improved as ω ₀ is increased. However, since there is a control delay due to the characteristics of the thyristor converter, it is appropriate to set it to 500 to 1000 rad / s. A voltage control circuit as a voltage control system constituting a conventional power supply device of this type has been configured as a proportional system or an integral system. Therefore, for example, when the voltage disturbance w is applied at the output of the thyristor conversion device as the AC / DC conversion means, the output voltage of the voltage control circuit becomes as shown in FIG. FIG. 3 (b) shows the case of the integral system. That is, when the voltage control circuit is constituted by a proportional control system, a part of the disturbance voltage w remains as the steady-state deviation δ due to the control offset in the proportional control, and as a result, the output current (load current) fluctuates.

When the voltage control circuit is constituted by an integral system, the steady-state deviation δ can be eliminated. However, an error voltage is generated due to a transient response delay.
A current fluctuation of a value obtained by dividing (voltage / time product) V · t by the inductance of the electromagnet occurs.

On the other hand, the response waveform to the voltage disturbance of the constant voltage control circuit 6 of the power supply device according to the present invention is as shown in FIG. 3 (c). That is, when the control method of the present invention is adopted, the response to the voltage disturbance becomes faster than that of the integration system shown in FIG. 3 (b), and the damping constant 応 答 of the response waveform becomes 0.7
If it is selected to 1.5, the voltage change overshoots as shown in FIG. 4 so that V · t due to the error voltage of the voltage control system caused by the voltage disturbance can be reduced to almost zero. Almost never occurs.
In FIG. 3, u is an output voltage command output from the constant current control circuit 5, and v is an output voltage of the thyristor converter 1.

Next, the voltage control system of the power supply device shown in FIG.
FIG. 5 shows a gain characteristic when ζ = 1 in the closed loop of the (voltage control circuit), and FIG. 6 shows a phase characteristic. In these figures, the curve A shows the characteristics of the voltage control system of the power supply according to the present invention, and the curve B shows the characteristics of the voltage control system of the conventional power supply. As is clear from these figures, in the voltage control system of the power supply device according to the present invention, since a frequency equal to or less than half of the resonance frequency ω ₀ and ω ₀ = 500 to 1000 rad / s, for example, 50 Hz
Phase lag when a voltage pattern of about frequency is given
(Follow-up delay) with little control. In contrast, the voltage control system of the conventional power supply unit (integral control method)
In this case, a phase delay occurs even within the band.

When the power supply according to the present invention is applied to an excitation power supply of a main electromagnet of a particle accelerator such as a proton synchrotron, the power supply is inputted to the current control circuit 5 of FIG. The current set value (current pattern) r is as shown in FIG. In FIG. 7, a period Ta is an incident period for allowing protons generated by the proton generator to enter the accelerator, a period Tb is an acceleration period for accelerating the protons in the accelerator, a period Tc is a proton extraction period, and a period Td is a current injection. This is a reset period for returning to the hour value.

Next, a process of generating a current pattern for suppressing a transient deviation between the current set value r input to the current control circuit 5 and the detection output of the current detector 4 will be described with reference to FIG. I do. The following description focuses on a part of the basic current pattern shown in FIG. 7 which shifts from the incident period Ta to the acceleration period Tb. Here, assuming that the resistance of the electromagnet 3 is R and the inductance is L, the output voltage Vd applied to the electromagnet 3 by flowing the load current i according to the current pattern is as follows: Vd = Ri + Ldi / dt. Therefore, when a current of a broken line pattern is applied as in the basic current pattern shown by the broken line in FIG. 8A, the component di / dt of the second term on the right side of the above equation is shown by the broken line in FIG. 8B. It changes from 0 to A stepwise like this,
The transient deviation in the voltage control circuit increases, which is not preferable. Therefore, as shown by the solid line in FIG. 8B, in order to continuously and gradually change the di / dt component, as shown by the solid line in FIG. Perform First, as shown in FIG. 8B, a smoothing time T is set so that the component di / dt does not change from 0 to A stepwise. Here, the smoothing time refers to a period during which two straight line portions of a current pattern (voltage pattern) are connected by a spline function (a function of smoothly connecting two straight lines). The smoothing time T is taken as T / 2 before and after the time at which the slope of the current i changes when smoothing processing is not performed, that is, processing for smoothing the two linear portions by the spline function, and is continuously performed as a spline function up to the second derivative. In order to obtain a proper current pattern, that is, to make the derivative of di / dt quadratic, a cubic spline function is used in this embodiment. As a specific example, the differential value di / d of the current pattern
(1−cos (π · t / T)) / 2 is selected as a function of t. This curve is as shown by the solid line in FIG.
It should be noted that the smoothing time T is desirably 50 Hz or less when expressed by frequency with f = 1 / T in order to obtain the effect of suppressing the transient deviation to be small.

The current pattern (current command) subjected to the smoothing process in this way is actually generated by performing a calculation process using a computer or the like, and is finally D / A converted and output as a current set value r. (FIG. 8 (c)). At this time, the voltage Vd applied to the electromagnet 3 as a load becomes a curve having a continuous and gradual change as shown in FIG.

In the above configuration, the difference between the current set value r and the load current i detected by the current detector 4 is calculated by the adder 9 and input to the current control circuit 5. The current control circuit 5 calculates an output voltage command of the thyristor conversion device 1 necessary for making the deviation zero based on the above deviation, and outputs it to the adder 8 as a voltage set value u. Here, since the current set value r has been subjected to the smoothing process, the voltage set value u is also subjected to the smoothing process.

The adder 8 calculates a deviation between the voltage set value u and the output voltage v of the thyristor converter 1, and this deviation is input to the voltage control circuit 6. In the voltage control circuit 6, the integral operation and the proportional integral operation circuit 62 perform integration and proportional integral operation on the above deviation, and output the result to the automatic pulse phase shifter 7 as a final ignition phase angle command.

The automatic pulse phase shifter 7 controls the output voltage v of the thyristor converter 1 in accordance with the output voltage command of the voltage control circuit 6, and this output voltage v is output to the adder 8 and to the DC filter 2 Is entered. The output voltage v of the thyristor converter 1 is applied to the electromagnet 3 after the AC component is removed by the DC filter 2. A voltage Vd is applied to the electromagnet 3, and a current i flows through the exciting coil. This current i is detected by the current detector 4, and the detection output is input to the adder 9. The adder 9 calculates a deviation between the current set value r and the detection output i of the current detector 4.

In this manner, the output control of the exciting current i of the electromagnet 3 is performed. Here, the parameter of the transfer function of the voltage control circuit 6, that is, the voltage control system of the power supply device is, as described above, an attenuation constant such that the product V · t of the error voltage V caused by the voltage disturbance and the time t becomes zero. ζ is selected from 0.7 to 1.5, and the resonance frequency ω ₀ is selected from 500 to 1000 rad / s. Therefore, even if a voltage disturbance occurs on the output side of the thyristor conversion device 1, the fluctuation of the output current of the electromagnet 3 can be suppressed to a very small value.

Next, another embodiment of the power supply device according to the present invention is shown in FIG. In this figure, the same elements as those in FIG. 1 are denoted by the same reference numerals, and duplicate description will be omitted. This embodiment is different from the embodiment shown in FIG. 1 in that a voltage set value u ₀ for feedforward control is generated by a set value generator 11 separately from a current set value r.
Active filter 10 between DC filter 2 and electromagnet 3
Is provided. In FIG. 9, the set value generator 11 includes a computer 110 and D / A converters 111 and 112. The active filter 10 includes an adder 100,
It comprises a high-pass filter 101, an amplifier 102, and a reactor transformer 103.

In the above configuration, when a new current set value 12 is given to the set value generator 11 from the outside, the computer 11
At 0, the set value pattern s is calculated by the above-described smoothing processing algorithm that is continuous up to the second derivative,
The set value pattern s at each time is output for each sampling time Ts. This set value pattern s is the D / A converter 111
, And is output to the adder 9. The adder 9 calculates a deviation between the current set value r and the load current i of the electromagnet 3 detected by the current detector 4 and inputs the calculated deviation to the current control circuit 5, where the current control circuit 5 converts the current into a constant current. The value is output to the adder 81 as the set value u.

On the other hand, the adder 81 includes a set value generator 1
The voltage set value u ₀ generated from 1 is input. This voltage set value u ₀ is calculated by a computer 110 in the set value generator 11 as shown in FIG.
Is converted from the current set value 12 (FIG. 10A) input into the voltage pattern u ₀₀ (FIG. 10B), and this voltage pattern is further converted into a voltage pattern u ₀ by a smoothing process. This voltage pattern u ₀ is output to the adder 81 via the D / A converter 112. As a result, an output voltage command of u + u _{0 is} input from the adder 81 to the adder 8 and the active filter 10. The output voltage v of the thyristor converter 1 is input to the adder 8, and u + u ₀ is input to the voltage control circuit 6.
An error voltage (deviation) of −v is input. Voltage control circuit 6
In the above, voltage control is performed by the operation described above, and finally output control of the exciting current i of the electromagnet 3 is performed.

On the other hand, the output voltage v of the thyristor converter 1
Are reduced by the DC filter 2 and input to the active filter 10. In the active filter 10, the output voltage of the DC filter 2 and the output voltage of the adder 8 are input to the adder 100, and the deviation is calculated by the adder 100. The output voltage of the adder 100 is
1, and the high-pass filter 101 extracts an AC component. This AC component is output to reactor transformer 103 via amplifier 102. In the reactor transformer 103, the output voltage of the amplifier 102 is inverted, and the reactor transformer 103
An AC component having a phase opposite to the AC component included in the output voltage of the DC filter 2 is induced on the secondary side of the DC filter 2. As a result, the AC component included in the output voltage of the DC filter 2 is removed.

In this embodiment, a voltage obtained by subtracting a voltage set value from the output voltage of the thyristor converter 1 is input to the active filter 10. Therefore, the active filter 10 does not operate for the voltage change due to the current control accompanying the change in the current set value, and the operation can be stabilized.
Further, in the power supply device according to the present embodiment, since the voltage control system is a type 2 system, the error between the voltage set value and the actual output voltage can be reduced for the above-described reason. Can be reduced.

Next, an embodiment in which the power supply according to the present invention is applied as an excitation power supply for the main electromagnet of the synchrotron particle accelerator will be described. First, the overall configuration (not shown) of a typical proton synchrotron as a synchrotron particle accelerator will be described.

Proton generated by discharge in proton generator
(Hydrogen ion) is accelerated by high voltage in the pre-accelerator,
Furthermore, it is accelerated by a booster by a linear accelerator, sent to a final stage accelerator (main ring), accelerated while circulating, and given energy.

The final stage accelerator forms a circular orbit, on which a main electromagnet and a high-frequency accelerating cavity are arranged.
The main electromagnet is composed of a deflection electromagnet for deflecting the proton so as to orbit the circular orbit, a focusing quadrupole electromagnet for converging the proton beam so as not to leave the circular orbit, and a diverging quadrupole electromagnet. Further, a power supply device for direct current excitation of each electromagnet is also provided. These power supplies have a large output, abruptly change the load current and the load voltage in a fixed pattern, and repeat this pattern periodically, so that high precision, high power factor, and high reliability are required.

The high-frequency accelerating cavity is a device for accelerating protons with a high-frequency magnetic field, and the protons are gradually accelerated each time they pass through the high-frequency accelerating cavity.

Next, the connection between the electromagnet of the proton synchrotron and the power supply according to the present invention for exciting the electromagnet is shown in FIG.
It is shown in FIG. In the figure, a bending electromagnet excitation power supply 31
The power supply for exciting the bending electromagnet 34 is a power supply for exciting the focusing quadrupole electromagnet 35. The diverging quadrupole electromagnet excitation power supply 33 is a power supply for exciting the diverging quadrupole electromagnet 36. Each electromagnet is connected in series.

Next, the acceleration of protons will be described. Upon proton acceleration, the magnetic field generated by these electromagnets is increased according to the energy of the protons. If the time for accelerating the protons is, for example, 1 second, the high-level energy accelerated from the magnetic field of about 10% corresponding to the protons of the low energy level at the beginning of the acceleration when the protons are injected into the final stage accelerator to the predetermined energy level. Rapidly change in one second to 100% magnetic field corresponding to energy level protons. In order to focus the proton beam so as not to depart from the circumferential orbit, it is necessary to control the magnetic field with high accuracy of 0.01% or more. Therefore, each power supply device that supplies the exciting current to each electromagnet constituting the proton synchrotron is required to have extremely high accuracy, suppress ripples, and change the load current (exciting current) at high speed. You.

By applying the power supply device according to the present invention to the synchrotron particle accelerator, it is possible to accurately maintain the orbit of the particles, so that the particles can be accelerated to a predetermined energy level in a short time and in a stable state. .

[0041]

As described above, according to the power supply device of the present invention, the voltage control means as the voltage control system is controlled by the output voltage command generated by the current control means and the output voltage detection value of the AC / DC conversion means. Capture the deviation and reduce this deviation by at least 2
Since the configuration is such that the integration process is performed and output as the output voltage command of the AC / DC conversion means, the responsiveness can be improved, the voltage disturbance can be suppressed rapidly, and the fluctuation of the load current caused by the voltage disturbance can be extremely reduced. Can be smaller.

According to the power supply device of the present invention, the current pattern output by the current command control means is formed using a cubic spline function whose bent portion is continuous up to the second derivative. Therefore, the response delay of the voltage control means to the voltage set value given by the current control means is reduced, and the transient deviation caused by the voltage disturbance between the current pattern given to the current control means by the current command generation means and the load current is reduced. Can be smaller.

Further, according to the power supply device of the present invention, the output voltage pattern of the AC / DC conversion means corresponding to the current pattern is generated by using the current pattern flowing to the load and the load characteristic constant by the voltage advance command generation means. Since the configuration is such that the load current is added to the command, the load current can be changed by the feedforward control, and a high-speed response to the current pattern can be achieved.

Further, according to the power supply device of the present invention, the active type filter detects the voltage pulsation included in the output voltage of the thyristor converter as the AC / DC converter, and generates a voltage having a phase opposite to the voltage pulsation. Since the signal is superimposed on the signal on the output side of the AC / DC converter, voltage pulsation included in the output voltage of the AC / DC converter can be suppressed. Then, a voltage obtained by subtracting the output voltage command generated by the current control means input to the voltage control means from the output voltage of the AC / DC conversion means is input to the active filter.
The active filter does not operate with respect to the voltage change due to the current control accompanying the change in the current pattern, and the operation of the power supply device can be stabilized.

Further, according to the particle accelerator of the present invention, the main electromagnet is excited by the power supply device having the above-described configuration with high accuracy and high speed response at a predetermined current and voltage pattern, thereby accurately maintaining the orbit of the particles. However, the particles can be accelerated to a predetermined energy level in a short time and in a stable state.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a power supply device according to the present invention.

FIG. 2 is a block diagram expressing a control system including a constant voltage control circuit, a constant current control circuit, an automatic pulse phase shifter, and a thyristor converter of the power supply device shown in FIG. 1 by a transfer function.

FIG. 3 is an explanatory diagram showing a response characteristic of a voltage control system of the power supply device according to the present invention to a voltage disturbance in comparison with a conventional device.

FIG. 4 is a characteristic diagram showing a specific example of a response characteristic of the voltage control system according to the present invention to a voltage disturbance.

FIG. 5 is a characteristic diagram showing gain characteristics of a voltage control system of the power supply device according to the present invention.

FIG. 6 is a characteristic diagram showing phase characteristics of a voltage control system of the power supply device according to the present invention.

FIG. 7 is a waveform diagram showing an example of a current pattern provided to a current control system of the power supply device according to the present invention.

FIG. 8 is an explanatory diagram showing the contents of a smoothing process of the power supply device according to the present invention.

FIG. 9 is a block diagram showing another embodiment of the power supply device according to the present invention.

10 is an explanatory diagram showing a voltage pattern given to a voltage control system for feedforward control in the power supply device shown in FIG.

FIG. 11 is a connection diagram showing a connection relationship between each electromagnet constituting a proton synchrotron as a particle accelerator and a power supply device for exciting each electromagnet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thyristor converter 2 DC filter 3 Electromagnet 4 Current detector 5 Constant current control circuit 6 Constant voltage control circuit 7 Automatic pulse phase shifter 8, 9 Adder 10 Active filter 11 Set value generator 100 Adder 101 High-pass filter 102 Amplifier 103 Reactor transformer 110 Computer

Claims (12)

(57) [Claims] 1. An AC / DC converter for controlling a firing phase of a switching element on the basis of a given ignition phase angle command and outputting a voltage corresponding to the ignition phase angle command to a load; And a current control means for generating an output voltage command based on the difference, and inputting a difference between the output voltage command and an output voltage detection value of the AC / DC conversion means. And voltage control means for outputting at least a second-order integration process as an ignition phase angle command of the AC / DC conversion means. 2. An AC / DC converter having a switching element for converting AC to DC and supplying a DC voltage to a load; a current command generator for generating a current command based on a current pattern flowing to the load; A current control means for inputting a deviation between the command and the load current detection value, generating and outputting an output voltage command of the AC / DC conversion means necessary for removing the deviation, and an output of the voltage command and the output of the AC / DC conversion means. A voltage control means for inputting a deviation from the detected voltage value, generating and outputting an ignition phase angle command of the AC / DC conversion means required for removing the deviation, and the AC / DC conversion based on the ignition phase angle command Control means for controlling the output of the AC / DC conversion means by controlling the switching element of the means, wherein the voltage control means integrates the deviation and further proportionally integrates the integrated value. And electricity Source equipment. 3. The resonance frequency ω ₀ of the voltage control means is set to 500
The power supply device according to claim 1, wherein the power supply is set to 1000 rad / sec. 4. The decay constant の of the voltage control means is set to 0.7 to 0.7.
3. The power supply device according to claim 1, wherein the power supply device is set to 1.5. 5. The current command generating means according to claim 1, wherein the bent portion of the current pattern to be set is formed using a cubic spline function that is continuous up to a second derivative. The power supply device according to any one of the above. 6. A voltage for calculating a voltage pattern of an output voltage of the AC / DC converter corresponding to the current pattern by using the current pattern and a load characteristic constant, and generating an output voltage advance command based on the voltage pattern. 3. The power supply device according to claim 1, further comprising a preceding command generation unit, wherein the output voltage preceding command is added to the output voltage command. 4. 7. The power supply device according to claim 5, wherein a frequency applied to a bent portion of the current pattern or the voltage pattern is 50 Hz or less. 8. An AC-DC converter having a switching element for converting an AC to a DC and outputting the same, detecting a pulsating component of an output voltage of the AC-DC converter, and generating a voltage having an opposite phase to the pulsating component. An active filter that superimposes the signal on the output side of the AC / DC converter, a current command generator that generates a current command based on a current pattern flowing to the load, and a deviation between the current command and a load current detection value. Current control means for generating and outputting an output voltage command of the AC / DC conversion means necessary for removing the deviation; and inputting a difference between the output voltage command and an output voltage detection value of the AC / DC conversion means. Voltage control means for generating and outputting a point-and-shoot phase angle command of the AC-DC converter required for removing the deviation; and AC-DC conversion by controlling a switching element of the AC-DC converter based on the point-and-shape phase angle command. Of means Control means for performing output control, wherein the voltage control means integrates the deviation and further proportionally integrates the integrated value. A power supply device, wherein a voltage obtained by subtracting the output voltage command input to the control means is input. 9. A particle generator for generating particles, a pre-stage accelerator for accelerating the particles generated by the particle generator to a predetermined energy level, and the particles accelerated by the pre-stage accelerator are rotated by a main electromagnet. In a particle accelerator having a final-stage accelerator that is accelerated by a high-frequency acceleration cavity to apply predetermined particle energy, and a power supply that excites the main electromagnet, the power supply has a switching element and converts AC to DC. AC / DC conversion means for supplying a DC voltage to the load, current command generation means for generating a current command based on a current pattern flowing to the load, and a deviation between the current command and a detected load current value, and the deviation is inputted. A current control means for generating and outputting an output voltage command of the AC / DC conversion means required for removal, and a deviation between the voltage command and an output voltage detection value of the AC / DC conversion means. A voltage control means for generating and outputting an ignition phase angle command of the AC / DC conversion means necessary for removing the deviation, and a switching element of the AC / DC conversion means based on the ignition phase angle command. Control means for controlling the output of the AC / DC conversion means, wherein the voltage control means integrates the deviation and further proportionally integrates the integrated value. 10. A particle generator for generating particles, a pre-stage accelerator for accelerating the particles generated by the particle generator to a predetermined energy level, and the particles accelerated by the pre-stage accelerator are rotated by a main electromagnet. A final-stage accelerator that is accelerated by a high-frequency accelerating cavity to impart predetermined particle energy;
In a particle accelerator having a power supply for exciting the main electromagnet, the power supply has a switching element, converts AC to DC, and supplies AC voltage to the load. A current command generating means for generating a current command based on the current command and a deviation between the current command and the detected load current, and generating and outputting an output voltage command of the AC / DC conversion means required for removing the deviation. A current control unit, and a voltage control for inputting a deviation between the voltage command and the output voltage detection value of the AC / DC conversion unit, and generating and outputting an ignition phase angle command of the AC / DC conversion unit necessary for removing the deviation. Means, and control means for controlling the output of the AC / DC conversion means by controlling the switching element of the AC / DC conversion means based on the ignition phase angle command, wherein the voltage control means comprises: The current command generating means forms a bent portion of a current pattern to be set using a cubic spline function that is continuous up to a second derivative. And a particle accelerator. 11. A particle generator for generating particles, a pre-stage accelerator for accelerating particles generated by the particle generator to a predetermined energy level, and the particles accelerated by the pre-stage accelerator are rotated by a main electromagnet. A final-stage accelerator that is accelerated by a high-frequency accelerating cavity to impart predetermined particle energy;
In a particle accelerator having a power supply for exciting the main electromagnet, the power supply has a switching element, converts AC to DC, and supplies AC voltage to the load. A current command generating means for generating a current command based on the current command and a deviation between the current command and the detected load current, and generating and outputting an output voltage command of the AC / DC conversion means required for removing the deviation. A current control unit, and a voltage control for inputting a deviation between the voltage command and the output voltage detection value of the AC / DC conversion unit, and generating and outputting an ignition phase angle command of the AC / DC conversion unit necessary for removing the deviation. Means for controlling the output of the AC / DC converter by controlling the switching element of the AC / DC converter based on the ignition phase angle command, and the current command generator. A voltage leading command generating means for calculating a voltage pattern of an output voltage of the AC / DC converting means corresponding to the current pattern using a current pattern and a load characteristic constant, and generating an output voltage leading command based on the voltage pattern. A particle accelerator, wherein the output voltage advance command is added to the output voltage command, and the voltage control means integrates the deviation, and further performs a proportional integration of the integrated value. 12. A particle generator for generating particles, a pre-stage accelerator for accelerating the particles generated by the particle generator to a predetermined energy level, and the particles accelerated by the pre-stage accelerator are rotated by a main electromagnet. A final-stage accelerator that is accelerated by a high-frequency accelerating cavity to impart predetermined particle energy;
In the particle accelerator having a power supply device for exciting the main electromagnet, the power supply device has a switching element, and converts AC to DC to output by converting AC to DC; and a pulsating component of an output voltage of the AC / DC conversion means. An active filter that detects and generates a voltage in phase opposite to the pulsating component and feeds it back to the output side of the AC / DC converter; a current command generator that generates a current command based on a current pattern flowing to the load; A current control means for inputting a deviation between the current command and the load current detection value, generating and outputting an output voltage command of the AC / DC conversion means necessary for removing the deviation, A voltage control means for inputting a deviation from the output voltage detection value and generating and outputting an ignition phase angle command of the AC / DC conversion means necessary for removing the deviation; and an AC / DC converter based on the ignition phase angle command. Conversion hand Control means for controlling the output of the AC / DC conversion means by controlling the switching element of (i), wherein the voltage control means is configured to integrate the deviation and further proportionally integrate the integrated value; A voltage obtained by subtracting the output voltage command input to the voltage control means from the output voltage of the AC / DC conversion means.