JP4690706B2 - Power system - Google Patents

Description

  The present invention relates to a power supply system that simultaneously uses a plurality of power units of several MW class, such as an electromagnet power supply system for an accelerator and a superconducting power storage power supply system used for load fluctuation compensation.

  Electromagnet power supply systems for accelerators used in medical and physics research and superconducting power storage power supply systems used for load fluctuation compensation are power supply systems that use multiple power supply units at the same time due to the recent increase in equipment capacity. is there.

 These power supply systems use an AC / DC power converter to convert alternating current to direct current, supply direct current energy from the alternating current power supply to the electromagnetic load, and compensate the alternating current power from the direct current energy stored in the superconducting coil. Get energy. When the AC / DC power converter drives the semiconductor switch element in the AC / DC power converter by PWM (pulse width modulation) control, a harmonic current is generated in the AC output.

   Conventionally, as a technique for suppressing harmonic current from flowing into the power system, there is a method of applying phase shift of a transformer, installation of a harmonic filter, phase shift of a triangular wave carrier of PWM control (for example, patent) Reference 1).

An example of this will be described with reference to FIG. FIG. 11 shows one configuration example of the power supply system. Here, for ease of explanation, the power supply system is divided into three types. It aims at suppression of the harmonic outflow of the power supply device connected to 22 kV system and 6.6 kV system with respect to 66 kV system.
The 66 kV system is connected to the 22 kV system via the step-down transformer 100. A plurality of power supply devices 1 to 4 are connected to the 22 kV system. Here, a large-capacity power supply device of several MW class or higher is assumed. The power supply device 1 that supplies DC power to the power transfer object, for example, the coil 1c, and the power supply device 2 that supplies DC power to the power transfer object, for example, the coil 2c, are both the same type of power supply device. The power supply device 1 includes a three-phase transformer 1a on both the primary side and the secondary side, and an AC / DC converter (AC / DC power converter: a semiconductor switching element and a three-phase DC converter) 1b. The power supply device 2 includes a transformer 2a having a three-phase primary side and a secondary side, and an AC / DC converter (AC / DC power converter: a semiconductor switching element and a three-phase DC converter) 2b.

    The power supply device 3 that supplies DC power to the power transfer object, such as the coil 3c, and the power supply device 4 that supplies DC power to the power transfer object, such as the coil 4c, are the same type of power supply device. The power supply device 3 includes a transformer 3a having a three-phase primary side and a six-phase secondary side, and an AC / DC converter (AC / DC power converter: a semiconductor switching element and a six-phase DC converter) 3b. The power supply device 4 includes a transformer 4a having a three-phase primary side and a six-phase secondary side, and an AC / DC converter (AC / DC power converter: a semiconductor switching element and a six-phase DC converter) 4b.

    A plurality of power supply devices 10 to 11 are connected to the 6.6 kV system via the step-down transformer 101 from the 22 kV system. The power supply devices 10 and 11 are respectively a three-phase transformer 10a and an AC / DC converter (AC / DC power converter: a three-phase DC converter consisting of semiconductor switching elements) 10b, a three-phase transformer 11a and an AC / DC converter (AC / DC power conversion). Device: a three-phase DC converter comprising a semiconductor switching element) 11b.

    Here, a small and medium capacity power supply device of several MW class or less is assumed. In order to suppress harmonic outflow to the 66 kV system, generally, the harmonic filters 21 and 22 are connected to the 22 kV system and the 6.6 kV system, respectively.

    The power supply device 1 is connected from the 22 kV system to the AC / DC converter 1b via the transformer 1a. The transformer 1a insulates the AC / DC converter 1b from the AC power supply of the system and gives a desired transformation ratio and phase condition. The AC / DC converter 1b performs power transfer to the coil 1c through conversion from an AC power supply of the system to a DC power supply or reverse conversion thereof.

    In recent years, the AC / DC converter 1b is configured by a self-extinguishing element that can be controlled on / off, for example, an IGBT (Insulated Gate Bipolar Transistor). However, as the IGBT is driven by PWM control, desired AC power transfer is performed. Therefore, a harmonic current is generated on the AC side of the power supply device 1. The same applies to the power supply devices 2 to 4 and 10 to 11 introduced elsewhere.

    For example, in an accelerator electromagnet power supply system, pattern excitation is simultaneously used for coil loads of a plurality of power supply apparatuses 1 to 4 and 10 to 11 including those having different load constants. Also, in the superconducting power storage power supply system, if it is difficult to realize or optimize the power storage coil with a large capacity, the power supply device can be installed separately for the desired load fluctuation compensation power, or it can be added for enhancement Build a system with multiple power supplies. For this reason, a plurality of power supply devices are simultaneously used by exchanging power patterns.

    As a harmonic reduction method when using a plurality of power supply devices as described above, a triangular wave carrier and a sine wave carrier synchronized with the phase of the AC voltage waveform detected by the voltage detector 1v of the power supply device 1 are used. The gate controller 111e is provided with a predetermined phase setting therebetween. Similarly, the power supply device 2 includes a voltage detector 2v and a gate controller 112e, and the phase of the triangular wave carrier is set to be opposite to that of 111e. FIG. 11 shows a case where the gate controller 1f side is set to 0 ° and the gate controller 2f side is set to 30 ° with respect to a triangular wave carrier of 360 pulses at 360 °. By canceling out the harmonic components between the power supply device 1 and the power supply device 2, harmonics at the power receiving end can be reduced.

    In the conventional power supply system described above, the PWM control method for driving the AC / DC converter is the triangular wave carrier comparison method, but there is a method for selecting a space vector or a pulse pattern in addition to this (for example, see Non-Patent Document 1). .

Needless to say, the AC / DC converters 3b, 4b, 10b, and 11b other than the above-described AC / DC converters 1b and 2b are each supplied with a gate signal from a known gate controller (not shown). Absent.
JP-A-9-201056 Power Electronics Circuit, Ohm, p. p. 188-197

   The triangular wave carrier comparison method, which is an example of the PWM control method for driving the AC / DC converter described above, has a complicated configuration. Further, since a triangular wave carrier is not used in the method of selecting a space vector or a pulse pattern, a method of changing the carrier phase cannot be applied. Furthermore, in a current source converter that can be simply configured with only an AC / DC converter, it is necessary to consider that the conduction period of the arm of each phase is commutated at 120 °, so there are cases where a method of selecting a pulse pattern is selected. Many.

   On the other hand, the installation of the harmonic filter increases the phase capacity (reactive power) of the filter as the capacity of the system increases, which is a burden on the power receiving equipment.

   An object of the present invention is to suppress harmonics flowing into the power supply system while having a simple configuration when simultaneously using a plurality of power supply devices, and to reduce the size of the harmonic filter, reduce the phase advance capacity, An object of the present invention is to provide a power supply system capable of reducing the size and efficiency of the apparatus.

To achieve the aforementioned object, the present invention corresponding to claim 1, an AC power system, the first, second, third, between the fourth power transfer object, the first, second power a first and second direct-current power supply device that will be connected to each of the transfer object, and the AC power system, the third, the third and fourth direct current is connected to each of the fourth power exchange object A power supply;
Each of the first and second DC power supply devices respectively receives the AC power of the first and second six-phase transformers that transform the AC voltage of the AC power system, and the first and second six-phase transformers. Comprising first and second AC / DC converters for converting to DC power and supplying the first and second objects to be transferred;
The third and fourth DC power supply devices respectively supply the AC power of the third and fourth 12-phase transformers that transform the AC voltage of the AC power system, and the third and fourth 12-phase transformers. Comprising third and fourth AC / DC converters for converting to DC power and supplying the third and fourth power transfer objects;
A first AC voltage detector detects an AC voltage waveform applied between the AC power system and the first DC power supply device, and supplies a gate pulse to the first AC / DC power converter based on the AC voltage detector. A gate pulse controller;
An AC voltage detector detects an AC voltage waveform applied between the AC power system and the second DC power supply device, and based on this, a second pulse is supplied to the second AC / DC power converter. A gate pulse controller;
An AC voltage waveform applied between the AC power system and the third DC power supply device is detected by an AC voltage detector, and based on this, a third pulse is supplied to the third AC / DC power converter. A gate pulse controller;
An AC voltage waveform applied between the AC power system and the fourth DC power supply is detected by an AC voltage detector, and based on this, a fourth pulse is supplied to the fourth AC / DC power converter. A power supply system comprising a gate pulse controller,
Phase shifting the second transformer by 30 degrees relative to the first transformer, phase shifting the fourth transformer by 15 degrees relative to the third transformer, and the first and The phase of the output harmonic waveform of the second power supply device is opposite to that of the second power supply device, and the phase of the output harmonic waveform of the third and fourth power supply devices is opposite to that of the second power supply device. It is a power system.

To achieve the aforementioned object, the present invention corresponding to claim 2, an AC power system, between the first, second, third power exchange object, the first, second power exchange object First and second DC power supply devices connected to each of the above, the AC power system, a third DC power supply device connected to each of the third power transfer object,
Each of the first and second DC power supply devices respectively receives the AC power of the first and second six-phase transformers that transform the AC voltage of the AC power system, and the first and second six-phase transformers. Comprising first and second AC / DC converters for converting to DC power and supplying the first and second objects to be transferred;
The third DC power supply includes a third 12-phase transformer that transforms an AC voltage of the AC power system, and converts the AC power of the third 12-phase transformer into DC power to convert the third Comprising third and fourth AC / DC converters for supplying power to the object;
A first AC voltage detector detects an AC voltage waveform applied between the AC power system and the first DC power supply device, and supplies a gate pulse to the first AC / DC power converter based on the AC voltage detector. A gate pulse controller;
An AC voltage detector detects an AC voltage waveform applied between the AC power system and the second DC power supply device, and based on this, a second pulse is supplied to the second AC / DC power converter. A gate pulse controller;
An AC voltage waveform applied between the AC power system and the third DC power supply device is detected by an AC voltage detector, and based on this, a third pulse is supplied to the third AC / DC power converter. A gate pulse controller;
In a power supply system with
Phase shifting the second transformer 30 degrees relative to the first transformer, phase shifting the third transformer 15 degrees relative to the first transformer, and the first and The phase of the output harmonic waveform of the second power supply device is opposite to that of the second power supply device, and the phase of the output harmonic waveform of the first and third power supply devices is opposite to that of the second power supply device. It is a power system.

In order to achieve the object, the invention corresponding to claim 3 is connected to the first power transfer object between the high-voltage AC power system and at least one first power transfer object . At least one first DC power supply device ,
Between the high-voltage AC power system and zero or even number of second power transfer objects, zero or even number of second DC power supply devices connected to the second power transfer object When,
A low-voltage AC power system disposed via a step-down transformer in the high-voltage AC power system;
Between the low-voltage AC power system and the fifth and sixth power transfer objects, fifth and sixth DC power supply devices connected to the fifth and sixth power transfer objects,
The first DC power supply device includes a six-phase transformer that transforms an AC voltage of the high-voltage AC power system, and converts the AC power of the six-phase transformer into DC power, and the first power transfer object Comprising a first AC / DC power converter for supplying to
Each of the second DC power supply devices includes a 12-phase transformer that transforms an AC voltage of the high-voltage AC power system, and converts the AC power of the 12-phase transformer into DC power to receive the second power transfer target. A second AC / DC converter for supplying each of the objects,
Each of the fifth and sixth DC power supply devices includes a six-phase transformer that transforms an AC voltage of the low-voltage AC power system, and converts the AC power of each of the six-phase transformers into DC power. , Comprising fifth and sixth AC / DC power converters to be supplied for each sixth power transfer object,
An AC voltage detector detects an AC voltage waveform applied to each of the high-voltage AC power system and the first DC power supply device, and supplies a gate pulse to the first AC / DC power converter based on the detected waveform. A first gate pulse controller;
An AC voltage detector detects an AC voltage waveform applied to each of the high-voltage AC power system and the second DC power supply device, and supplies a gate pulse to the second AC / DC power converter based on the detected waveform. A second gate pulse controller;
An AC voltage detector detects an AC voltage waveform applied to each of the low-voltage AC power system and the fifth and sixth DC power supply devices, and the fifth and sixth AC / DC converters based on the detected AC voltage waveform. Fifth and sixth gate pulse controllers for supplying gate pulses to
In a power supply system with
The fifth, and the phase of the sixth one of the output harmonic wave of the direct-current power supply, the first direct-current power supply or said second output harmonic waveform of the DC power supply phase and reverse phase and The power supply system is characterized by the above.

In order to achieve the object, the invention corresponding to claim 4 is connected to the first power transfer object between the high-voltage AC power system and at least one first power transfer object . At least one first DC power supply device ,
Between the high-voltage AC power system and zero or even number of second power transfer objects, zero or even number of second DC power supply devices connected to the second power transfer object When,
A low-voltage AC power system disposed via a step-down transformer in the high-voltage AC power system;
Between the low-voltage AC power system and the fifth and sixth power transfer objects, fifth and sixth DC power supply devices connected to the fifth and sixth power transfer objects,
The first DC power supply device includes a six-phase transformer that transforms an AC voltage of the high-voltage AC power system, and converts the AC power of the six-phase transformer into DC power, and the first power transfer object A first AC / DC power converter for supplying to
Each of the second DC power supply devices includes a 12-phase transformer that transforms an AC voltage of the high-voltage AC power system, and converts the AC power of the 12-phase transformer into DC power to receive the second power transfer target. And a second AC / DC power converter for supplying each of the objects,
Each of the fifth and sixth DC power supply devices includes a six-phase transformer that transforms an AC voltage of the low-voltage AC power system, and converts the AC power of each of the six-phase transformers into DC power. , Comprising fifth and sixth AC / DC power converters to be supplied for each sixth power transfer object,
An AC voltage detector detects an AC voltage waveform applied to each of the high-voltage AC power system and the first DC power supply device, and supplies a gate pulse to the first AC / DC power converter based on the detected waveform. A first gate pulse controller;
An AC voltage detector detects an AC voltage waveform applied to each of the high-voltage AC power system and the second DC power supply device, and supplies a gate pulse to the first AC / DC power converter based on the detected waveform. A second gate pulse controller;
The AC voltage waveform applied to each of the low-voltage AC power system and the fifth and sixth DC power supply devices is detected by an AC voltage detector, and based on this, the fifth and sixth AC / DC power converters are detected. Fifth and sixth gate pulse controllers for supplying gate pulses;
In a power supply system with
The transformer of the first DC power supply device or the transformer of the second DC power supply device is phase-shifted by 30 degrees with respect to any one of the transformers of the fifth and sixth DC power supply devices. This is a power supply system characterized by the above.

In order to achieve the above object, the invention corresponding to claim 5 is connected to the first power transfer object between the high-voltage AC power system and at least one first power transfer object . At least one first AC power supply device,
And the high voltage AC power system, zero one or between the even number second power exchange objects, the zero or Ru is connected to the second power exchange objects or even number of the second AC power supply When,
A low-voltage AC power system disposed via a step-down transformer in the high-voltage AC power system;
Between the low-voltage AC power system and the fifth and sixth power transfer objects, fifth and sixth AC power supply devices connected to the fifth and sixth power transfer objects,
The first AC power supply device includes: a first AC / DC power converter that converts DC power from the first power transfer object to AC power; and AC power converted by the first AC / DC power converter. A six-phase transformer that transforms each of the AC voltages and applies them to the high-voltage AC power system,
The second AC power supply device includes: a second AC / DC power converter that converts DC power from the second power transfer object into AC power; and AC power converted by the second AC / DC power converter. A twelfth phase transformer for transforming each of the alternating voltages and applying it to the high voltage alternating current power system,
The fifth and sixth AC power supply devices respectively include fifth and sixth AC / DC power converters that convert DC power from the fifth and sixth power transfer objects into AC power, respectively, and the fifth The fifth and sixth six-phase transformers respectively transforming the AC voltage of the AC power converted by the sixth AC / DC power converter and applying it to the low-voltage AC power system,
An AC voltage detector detects an AC voltage waveform applied to each of the high-voltage AC power system and the first AC power supply device, and supplies a gate pulse to the first AC / DC converter based on the detected AC voltage waveform. 1 gate pulse controller;
An AC voltage detector detects an AC voltage waveform applied to each of the high-voltage AC power system and the second AC power supply device, and supplies a gate pulse to the second AC / DC power converter based on the detected AC voltage waveform. A second gate pulse controller;
An AC voltage detector detects an AC voltage waveform applied to each of the low-voltage AC power system and the fifth and sixth AC power supply devices, and the fifth and sixth AC / DC converters based on the detected AC voltage waveform. Fifth and sixth gate pulse controllers for supplying gate pulses to
In a power supply system with
The transformer of the first DC power supply device or the transformer of the second DC power supply device is phase-shifted by 30 degrees with respect to any one of the transformers of the fifth and sixth DC power supply devices. This is a power supply system characterized by the above.

  According to the present invention, when a plurality of power supply devices are used at the same time, the harmonics flowing into the power supply system are suppressed while having a simple configuration, and the harmonic filter is reduced in size and the phase advance capacity is reduced. A power supply system that can reduce the size and increase the efficiency of the apparatus can be provided.

   Hereinafter, embodiments of a power supply system according to the present invention will be described with reference to the drawings.

(First embodiment)
First, the first embodiment will be described with reference to FIG. The same elements as those in FIG. 11 are denoted by the same reference numerals, description thereof is omitted, and only different parts are described here. The first embodiment is generally configured as follows. That is, based on the voltage waveform detected from the AC voltage detectors 1V and 2V for detecting the AC voltage of the 22KV AC power system and the AC voltage detectors 1V and 2V, the power supply devices 1, 2, 3, 4, 10, 11 of the same type of power supply device, for example, each AC / DC power converter 1 b, 2 b included in each of the power supply devices 1, 2 is given a gate pulse. The phase of the gate pulse applied to each AC / DC converter 1b, 2b included in the first power supply unit 1, 2 or the second type power supply unit 3, 4 according to the gate phase condition between each AC / DC converter 1b, 2b And gate pulse controllers 1d and 2d that can be set to desired values for harmonic suppression, and output harmonics of the first type power supply devices 1 and 2 or the second type power supply devices 3 and 4. Wave waveform is out of phase A power supply system was set to be. The configuration described above is a case where the transformers 1a, 2a, 3a, 4a, 10a, and 11a of FIG.

    Further, when the first type power supply device 1 or 2 or the second type power supply device 3 or 4 is selected from among the power supply devices 1, 2, 3, 4, 10, or 11, the power supply device 1 or 2 is selected. The phase of the transformers in the power supply devices 1, 2, 3, and 4 is set to a desired value for suppressing harmonics depending on the phase condition between the transformers 1a, 2a, 3a, and 4a. This is a power supply system that is set and in which the phases of the first or second type of power supply devices 1, 2, 3, and 4 are opposite in phase.

  Hereinafter, this embodiment will be specifically described. The gate phase controller 1d is provided with a gate phase setting φ provided to a gate pulse selected in synchronization with the phase detected by the system voltage detector 1v (here, the case where one pulse is energized at 120 °). . Similarly, the power supply device 2 includes a voltage detector 2v and a gate controller 2d. The setting of the phase φ of the gate pulse is selected so that the phases of the output harmonics of the power supply device 1 and the power supply device 2 are opposite to each other. For example, when reducing the harmonics of six-phase sideband components (5th and 7th), the phase φ of the gate pulse is set so that 2d is 30 ° with respect to 0 ° of 1d.

  The phase difference of 30 ° is a value that is shifted by 1/2 cycle with respect to one cycle of the 6th-order component being 60 ° (= 360 ° / 6th order). Since the 6th-order component is even-order, no harmonics are theoretically generated, but the 5th-order and 7th-order components, which are sidebands, are reduced.

  Accordingly, since the harmonic current is reduced in the 22 kV system to which the power supply device 1 and the power supply device 2 are connected, it is possible to reduce the burden capacity of the harmonic filter 21 installed in the same system and to reduce the size. The harmonic reduction is the same for the combination of the power supply 3 and the power supply 4 or the combination of the power supply 10 and the power supply 11 in the 6.6 kV system via the step-down transformer 101. In the case of harmonic reduction in the 6.6 kV system, the harmonic filter 22 can be downsized.

  As described above, in a plurality of power supply devices, by synchronizing the power supply devices individually with the power supply voltage of the system and setting the phase of the gate pulse between the power supply devices to a desired value, it is possible to connect to the system with a simple configuration. In addition to suppressing outflow harmonics, the harmonic filter can be downsized and the phase advance capacity can be reduced. In addition, when the number of power supply devices that can be phase-set in the power supply system increases, higher order component harmonics can be reduced by multiplexing, so that the number of pulses (switching frequency) per power supply device can be reduced. As a result, it is possible to provide a power supply system in which element loss and snubber loss due to switching are reduced and the power supply apparatus can be reduced in size and efficiency.

(Second Embodiment)
A second embodiment will be described with reference to FIG. The same elements as those in FIGS. 11 and 1 are denoted by the same reference numerals, description thereof is omitted, and only different parts are described here. The second embodiment is generally configured as follows. That is, based on the voltage waveform detected from the AC voltage detectors 1V and 2V for detecting the AC voltage of the 22KV AC power system, and the AC voltage detectors 1V and 2V, the first type power supply device 1, 2 and 2, each of the AC / DC power converters 1 b, 2 b, 3 b, 4 b included in each of the power supply devices 3, 4 is provided with a gate pulse. And the AC / DC power converters 1b included in all of the power supplies 1, 2, 3, and 4 depending on the gate phase condition between the AC / DC converters 1b, 2b, 3b, and 4b included in the second type power supply units 3 and 4, respectively. Comprising gate pulse controllers 1d, 2d, 3d, and 4d capable of setting the phase of the gate pulse applied to 2b, 3b, and 4b to a desired value for harmonic suppression, and power supply devices 1, 2, 3, Set phase out of 4 1 and the second type of power supply 1, 2, 3, 4 kinds of phase is in the power system so as to be opposite phase.

  The configuration described above is a case where the gate pulse controllers 1d, 2d, 3d, and 4d are used. In order to achieve the same purpose and effect, the transformers 1a, 2a in the power supply devices 1, 2, 3, and 4 are used. 3a and 4a may be used. That is, when selecting the first and second types of power supply devices 1, 2, 3, and 4, the phase between the transformers 1a, 2a, 3a, and 4a included in each of the power supply devices 1, 2, 3, and 4, respectively. Depending on conditions, the phase of the transformers 1a, 2a, 3a, 4a in the first and second types of power supply devices 1, 2, 3, 4 is set to a desired value for harmonic suppression, and the first This is a power supply system in which the phases of the output harmonic waveforms of the first and second types of power supply devices 1, 2, 3, and 4 are opposite in phase.

  Hereinafter, this embodiment will be specifically described. In the present embodiment, the power supply device 1 and the power supply device 2, and the power supply device 3 and the power supply device 4 are selected in combination as the same type of power supply device from among the plurality of power supply devices. Since the combination of the power supply device 1 and the power supply device 2 is composed of a single 6-phase, a 30 ° phase shift is selected for the transformer 2a of the power supply device 2 with respect to the transformer 1a of the power supply device 1. Further, since the combination of the power supply device 3 and the power supply device 4 is composed of a single 12-phase, a 15 ° phase shift is selected for the transformer 4a of the power supply device 4 with respect to the transformer 3a of the power supply device 3. To do. Harmonics can be reduced by selecting both the power supply device 1 and the power supply device 2 and the power supply device 3 and the power supply device 4 so that the phase of the output harmonics is opposite.

  As described above, in a plurality of power supply devices, the same type of power supply device is selected, and the phase of the transformers 1a, 2a, 3a, 4a or the gate pulse controllers 1d, 2d, 3d, 4d is set to a desired value between the power supply devices. In addition to suppressing the outflow harmonics to the system, the harmonic filter can be reduced in size and the phase advance capacity can be reduced. In addition, if the number of power supply devices that can shift the phase of the transformer in the power supply system increases, the harmonics of higher-order components can be further reduced by multiplexing, so the number of pulses (switching frequency) per power supply device can be reduced. It becomes. As a result, it is possible to provide a power supply system in which element loss and snubber loss due to switching are reduced and the power supply apparatus can be reduced in size and efficiency.

(Third embodiment)
A third embodiment will be described with reference to FIG. The third embodiment is generally configured as follows. That is, for example, four AC voltage detectors (not shown here, which are similar to FIGS. 1 and 2) for detecting the AC voltage of the 22 KV AC power system, and voltage waveforms detected by the AC voltage detector. Based on the voltage waveform, a gate pulse is given to each of the AC / DC power converters 1b, 2b, 3b, 4b included in each of the first and second types of power supply devices 1, 2, 3, 4 The first and second types and the first and second types according to the gate phase condition between the AC / DC power converters 1b, 2b, 3b, and 4b included in the first and second types of power supply devices 1, 2, 3, and 4, respectively. Gate pulse controller capable of setting the phase of the gate pulse applied to the AC / DC power converters 1b, 2b, 3b, and 4b of the power supply devices 1, 2, 3, and 4 of this type to a desired value for suppressing harmonics (Although not shown here, FIG. 2), and output harmonics of the first and second types of power supply devices 1, 2, 3, 4 for setting the phase of the power supply devices 1, 2, 3, 4 This is a power supply system in which the phase of the waveform is reversed.

  The configuration described above is a case where a gate pulse controller is used, but in order to achieve the same purpose effect, the transformers 1a, 2a, 3a, 4a in the power supply devices 1, 2, 3, 4 are used. Also good. That is, when selecting the first and second types of power supply devices 1, 2, 3, and 4, the phase between the transformers 1a, 2a, 3a, and 4a included in each of the power supply devices 1, 2, 3, and 4, respectively. Depending on the conditions, the phase of the transformer in the first or second and the first and second types of power supply devices 1, 2, 3, 4 is set to a desired value for harmonic suppression, and the first This is a power supply system in which the phases of output harmonic waveforms of the first and second types of power supply devices 1a, 2a, 3a, and 4a are opposite in phase.

  Hereinafter, this embodiment will be specifically described. In the present embodiment, the phase shift of the transformer is multiplexed by combining the power supply device 4 with the combined configuration of the power supply device 1 and the power supply device 2 of the embodiment of FIG.

When the AC / DC converter 4b of the power supply device 4 is driven by the same gate control method as that of the AC / DC converter 1b of the power supply device 1 and the AC / DC converter 2b of the power supply device 2, the difference between the power supply device configurations (the power supply device 1 and the power supply device) The frequency components of the outflow harmonics are the same except that the single unit configuration of 2 is 6 phases and the power supply device 4 is 12 phases. Therefore, the secondary side of the transformer 2 a of the power supply device 2 is phase-shifted by 30 ° by the combination of the power supply device 1 and the power supply device 2 to have the same 12-phase configuration as the power supply device 4. Further, the primary side of the transformers 1a and 2a of the power supply device 1 and the power supply device 2 is shifted by 15 ° from the primary side of the transformer 4a of the power supply device 4, thereby forming an apparent 24-phase configuration as a whole. Provide. If the harmonic outflow amount of the combination of the power supply device 1 and the power supply device 2 is equal to the harmonic outflow amount of the power supply device 4, the harmonic reduction effect of the 23rd and 25th order components is great. Since the phases between the power supply devices are opposite to each other, a reduction effect can be obtained even when the sizes are different.

 As described above, in a plurality of power supply devices, the configuration of power supply devices with different ratings is similar, and the phase of the transformer is selected to a desired value between the power supply devices, thereby suppressing the outflow harmonics to the system. The harmonic filter can be downsized and the phase advance capacity can be reduced. Further, the number of combinations of power supply devices that can shift the phase of the transformer in the power supply system is increased, and the harmonics of higher-order components can be further reduced by multiplexing, so that the power supply device can be reduced in size and efficiency. In addition, it is possible to provide a power supply system that can flexibly reduce harmonics in response to rating variations and expansion of power supply facilities.

 In FIG. 3, the reason that the power supply device 3 is indicated by a broken line means that the power supply device 3 is established even when there is no power supply device 3.

(Fourth embodiment)
A fourth embodiment will be described with reference to FIG. The fourth embodiment is generally configured as follows. That is, when selecting the first or second type of power supply device 1, 2, 3, 4, the phase between the transformers in the first or second type of power supply device 1, 2, 3, 4 respectively. Depending on the conditions, the phase of the transformers 1a, 2a, 3a, 4a and the step-down transformer 101 included in the first or second type power supply device 1, 2, 3, 4 is set to a desired value for suppressing harmonics. It is a power supply system set to.

  Hereinafter, this embodiment will be specifically described. The step-down transformer 101 is phase-shifted by 30 ° with respect to the transformer 1a of the power supply device 1 of the embodiment of FIGS. When the AC / DC converters 10b and 11b of the power supply devices 10 and 11 are driven by the same gate control method as that of the AC / DC converter 1b of the power supply device 1, the power supply device 1 and the power supply devices 10 and 11 pass through the step-down transformer 101. The frequency components of the flowing out harmonics are the same. By shifting the step-down transformer 101 by 30 ° with respect to the power supply device 1, an apparent 12-phase configuration is provided by combining the power supply device 1, the power supply device 10, and the power supply device 11.

  As described above, in a plurality of power supply devices, the power supply configurations of the power supply devices of different ratings and the entire lower system bus are similar, and the phase of the transformer is selected to a desired value between the power supply devices. In addition to suppressing outflow harmonics, the harmonic filter can be downsized and the phase advance capacity can be reduced. In particular, the high frequency filter of the lower system bus can also be omitted by serving as the upper high frequency filter 21. In addition, it is possible to provide a power supply system that can flexibly reduce harmonics in response to rating variations and expansion of power supply facilities.

 In FIG. 4, the reason that the power supply devices 2, 3, and 4 are indicated by broken lines means that the power supply devices 2, 3, and 4 are also provided.

(Fifth embodiment)
A fifth embodiment will be described with reference to FIG. The fifth embodiment is generally configured as follows. That is, for example, three AC voltage detectors (not shown here but similar to FIGS. 1 and 2) for detecting the AC voltage of the 22KV AC power system and the 6.6KV AC power system, and the AC voltage detector For each AC / DC power converter 1b, 2b or 3b, 4b and the lower power receiving system of each of the first or second type power supply devices 1, 2, 3 or 4 based on the voltage waveform detected by A gate pulse is applied to each AC / DC power converter 10b / 11b included in the power supply apparatus 10/11, and each AC / DC converter included in the first or second type power supply apparatus and the lower power receiving system Depending on the gate phase condition between the AC / DC power converters in the power supply device, the AC / DC power converters in the first or second type power supply device and the AC / DC power changes in the power supply device for the lower power receiving system A gate pulse controller (not shown here but similar to FIGS. 1 and 2) that can set the phase of the gate pulse applied to the detector to a desired value for harmonic suppression, In the power supply system, the phase of the output harmonic waveform included in the first or second type power supply device that performs phase setting of the power supply device and the power supply device for the lower power receiving system is reversed.

  The configuration described above is a case where a gate pulse controller is used, but in order to achieve the same purpose and effect, the transformers 1a, 2a, 3a, 4a and the lower power receiving in the power supply devices 1, 2, 3, 4 are achieved. The transformers 10a and 11a included in the system power supply devices 10 and 11 may be used. That is, when the first or second type power supply device 1, 2, 3, 4 and the lower power receiving system power supply device 10, 11 are selected from among the power supply devices 1, 2, 3, 4, 10, 11 Depending on the phase condition between the transformers 1b, 10b, and 11b included in the first or second type power supply devices 1, 2, 3, 4 and the lower power receiving system power supply devices 10, 11, respectively, The phase of the transformer in the type of power supply device and the power supply device for the lower power receiving system is set to a desired value for suppressing harmonics, and the power supply device for the first or second type and the lower power receiving system are used. This is a power supply system in which the phase of the output harmonic waveform of the power supply device is reversed.

  Hereinafter, this embodiment will be specifically described. In the present embodiment, the transformer 1a of the power supply device 1 is shifted by 30 ° with respect to the transformers 10a and 11a of the power supply device 10 and the power supply device 11 of the embodiment of FIG.

  As described above, the same operations and effects as those of the fourth embodiment can be obtained, and the phase shift of the transformer can be selected on the power supply device 1 (upper side) and the power supply devices 10 and 11 (lower order) side. Therefore, it is possible to provide a power supply system that can flexibly reduce harmonics in response to variations in ratings and expansion.

 In FIG. 5, the reason that the power supply devices 2, 3, and 4 are indicated by broken lines means that the power supply devices 2, 3, and 4 are also provided.

(Sixth embodiment)
A sixth embodiment will be described with reference to FIG. The present embodiment is a system including the step-down transformer 102, the power supply device 12, and the power supply device 13 with the same configuration as the step-down transformer 101, the power supply device 10, and the power supply device 11 of the embodiment of FIG. In contrast, the step-down transformer 102 is phase shifted by 30 °.

  From the above, harmonics are reduced by apparently having a 12-phase configuration between two identical voltage system buses. For example, when the same voltage system buses are divided by building, the harmonics are flexibly flexible. It is possible to provide a power supply system that can take measures to reduce the above.

(Seventh embodiment)
The seventh embodiment will be described with reference to FIG. The same elements as those in FIGS. 11 and 1 are denoted by the same reference numerals, description thereof is omitted, and only different parts are described here. The seventh embodiment
The reactive power detector 1e for detecting reactive power between the 22KV AC power system and one of the power supply devices 1 to 4, and the detected value obtained from the reactive power detector 1e and the reactive power command value, the power supply device 1 This is a power supply system provided with a controller 1f capable of operating the reactive power output and means 1g for multiplying an arbitrary reactive power set value that can be added to the reactive power command value.

As shown in FIG. 7, the controller 1f includes a subtractor 1f1, an active power proportional controller 1f2, a calculator 1f3, a pulse width modulator 1f4, an adder 1f5, a subtractor 1f6, and a reactive power proportional controller 1f7.
It is made up of.

This embodiment shows an example of a superconducting power storage system. Since the power supply device 1 performs power fluctuation compensation of the 66 kV system, the P value, the Q value and the command value P ^* , Q detected by the PQ detector 1e (where P is active power and Q is reactive power). ^{* With the} PQ controller 1f, the AC / DC converter 1b is driven to control the P value and Q value. On the other hand, the harmonic filter 21 for reducing harmonics of the power supply apparatus including the power supply apparatus 1 has a phase advance capacity (generation of reactive power) of about 10% to 20% of the entire power supply apparatus. Therefore, control is performed by adding a gain of 1 g to the phase advance capacity Q ^* (C) to the Q ^* command value of the PQ control 1f. If the gain 1g is set to 1, the entire phase advance capacity of the harmonic filter 21 is compensated. However, when the range of the rated output capacity of the power supply device 1 is exceeded, the compensation burden can be suppressed by setting the gain 1g. . There is no need to provide a reactive power compensator separately for the harmonic filter, which is economical.

  As described above, in a plurality of power supply devices, by allowing one power supply device to compensate for the phase advance capacity of the harmonic filter, it is possible to increase the harmonic capacity without increasing the facility capacity due to reactive power generation or installing the reactive power compensation device. It is possible to provide a power supply system that can reduce waves.

(Eighth embodiment)
The eighth embodiment will be described with reference to FIG. In the present embodiment, the power supply device 2 also includes a PQ detector 2e, a PQ controller 2f, and a gain 2g, similarly to the control configuration of the power supply device 1 of the embodiment of FIG.

From the above, in a plurality of power supply devices, when the ability to compensate the phase advance capacity of the harmonic filter is insufficient in one power supply device, for example, by weighting the gains 1g and 2g by the output capacity ratio of the power supply device, Reactive power compensation is performed with two power supply units. Further, the compensation burden can be suppressed by setting the gains 1g and 2g. Although two units are illustrated in the drawing, a combination of a plurality of power source devices and application to all power source devices are also possible for all power source devices connected to the power source system. Further, since there is no change in the phase advance capacity Q ^* (C), the Q ^* (C) command value may be fixedly set for each power supply device in advance without distributing the Q ^* (C) command value. Provide a power supply system that can reduce harmonics without increasing the installed capacity due to reactive power generation or installing a reactive power compensator by compensating the phase advance capacity of the harmonic filter with the power supply device in the power supply system It becomes possible.

(Ninth embodiment)
The ninth embodiment will be described with reference to FIG. The same elements as those in FIGS. 11 and 1 are denoted by the same reference numerals, description thereof is omitted, and only different parts are described here. This embodiment shows an example of a superconducting power storage system. The power supply device 10 has a function of controlling the P value and the Q value by driving the AC / DC converter 1b with the PQ controller 10f in order to perform power fluctuation compensation of the 66 kV system. In order to reduce the outflow of harmonics to the 66 kV system, harmonics are detected by the harmonic detector 31 and added to the operation amount of the PQ control in a negative phase (negative) so that the harmonics can be reduced. It also functions as a so-called active filter. Since the switching frequency in the AC / DC converter 10b can be set high if the large-capacity power supply device of the power supply devices 1 to 4 is comparatively small and the small-capacity power supply device 10, the control response is improved. It is possible to reduce the generated harmonic components. The compensation burden amount is adjusted within the output capacity range of the power supply device 10 by setting the gain 10g.

  The PQ controller 10f includes an active reactive power proportional controller 10f1, a subtractor 10f2, and a pulse width modulator 10f3.

  As described above, in a plurality of power supply devices, by providing an active filter function to one power supply device, the harmonics of the power supply system can be reduced and the harmonic filter can be reduced in size and a dedicated active filter device can be installed. Therefore, it is possible to provide a power supply system that can reduce harmonics.

(Tenth embodiment)
The tenth embodiment will be described with reference to FIG. In the present embodiment, similarly to the control configuration of the power supply apparatus 10 of the embodiment of FIG. 9, the power supply apparatus 11 also includes a gain 11g and a PQ controller 11f in the harmonic detector 31.

  As described above, in a case where a plurality of power supply apparatuses do not have sufficient capability to reduce and compensate for harmonics, for example, by weighting the gains 10g and 11g with the output capacity ratio of the power supply apparatuses, the two power supplies The device compensates for harmonic reduction. Further, the compensation burden amount can be suppressed by setting the gains 10 g and 11 g. Although two units are illustrated in the drawing, a combination of a plurality of power source devices and application to all power source devices are possible for a power source device connected to the power source system and capable of obtaining a high switching frequency. By compensating for the reduction of harmonics with the power supply device in the power supply system, it is possible to provide a power supply system that can reduce the harmonics without downsizing the harmonic filter or installing a dedicated active filter device. Become.

(Other embodiments)
In the above description, the power supply system is divided into 66 kV, 22 kV, and 6.6 kV. However, the power supply system is not limited to the number of divisions and voltage values. Further, the same effect can be obtained without depending on the number of device configurations of the exemplified power supply device, the method of serial / parallel configuration, the number of power supply devices and the combination method.

The figure for demonstrating 1st Embodiment of the power supply system of this invention. The figure for demonstrating 2nd Embodiment of the power supply system of this invention. The figure for demonstrating 3rd Embodiment of the power supply system of this invention. The figure for demonstrating 4th Embodiment of the power supply system of this invention. The figure for demonstrating 5th Embodiment of the power supply system of this invention. The figure for demonstrating 6th Embodiment of the power supply system of this invention. The figure for demonstrating 7th Embodiment of the power supply system of this invention. The figure for demonstrating 8th Embodiment of the power supply system of this invention. The figure for demonstrating 9th Embodiment of the power supply system of this invention. The figure for demonstrating 10th Embodiment of the power supply system of this invention. The figure for demonstrating an example of the conventional power supply system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1-4 ... Power supply device, 1a-4a ... Transformer, 1b-4b ... AC / DC converter, 1c-4c ... Coil, 1d-4d ... Gate pulse controller 10, 11 ... Power supply device for lower power receiving systems, 10a, DESCRIPTION OF SYMBOLS 11 ... Transformer, 10b, 11b ... AC / DC converter, 10c, 11c ... Coil, 10f ... PQ controller, 10f1 ... Active reactive power proportional controller, 10f2 ... Subtractor, 10f3 ... Pulse width modulator, 10g, 11g ... Gain, 31 ... harmonic detector, 100 ... step-down transformer, 101 ... step-down transformer, 102 ... step-down transformer, 111e ... gate controller, 112e ... gate controller.

Claims (5)

An AC power system, the first, second, third, between the fourth power transfer object, the first, the first and second DC that will be connected to each of the second power transfer object A power supply device, the AC power system, and third and fourth DC power supply devices connected to each of the third and fourth power transfer objects,
Each of the first and second DC power supply devices respectively receives the AC power of the first and second six-phase transformers that transform the AC voltage of the AC power system, and the first and second six-phase transformers. Comprising first and second AC / DC converters for converting to DC power and supplying the first and second objects to be transferred;
The third and fourth DC power supply devices respectively supply the AC power of the third and fourth 12-phase transformers that transform the AC voltage of the AC power system, and the third and fourth 12-phase transformers. Comprising third and fourth AC / DC converters for converting to DC power and supplying the third and fourth power transfer objects;
A first AC voltage detector detects an AC voltage waveform applied between the AC power system and the first DC power supply device, and supplies a gate pulse to the first AC / DC power converter based on the AC voltage detector. A gate pulse controller;
An AC voltage detector detects an AC voltage waveform applied between the AC power system and the second DC power supply device, and based on this, a second pulse is supplied to the second AC / DC power converter. A gate pulse controller;
An AC voltage waveform applied between the AC power system and the third DC power supply device is detected by an AC voltage detector, and based on this, a third pulse is supplied to the third AC / DC power converter. A gate pulse controller;
An AC voltage waveform applied between the AC power system and the fourth DC power supply is detected by an AC voltage detector, and based on this, a fourth pulse is supplied to the fourth AC / DC power converter. A power supply system comprising a gate pulse controller,
Phase shifting the second transformer by 30 degrees relative to the first transformer, phase shifting the fourth transformer by 15 degrees relative to the third transformer, and the first and The phase of the output harmonic waveform of the second power supply device is opposite to that of the second power supply device, and the phase of the output harmonic waveform of the third and fourth power supply devices is opposite to that of the second power supply device. Power system. An AC power system, the first, second, between the third power exchange object, the first, and the first and second direct-current power supply connected to each of the second power transfer object , The AC power system, a third DC power supply device connected to each of the third power transfer object,
Each of the first and second DC power supply devices respectively receives the AC power of the first and second six-phase transformers that transform the AC voltage of the AC power system, and the first and second six-phase transformers. Comprising first and second AC / DC converters for converting to DC power and supplying the first and second objects to be transferred;
The third DC power supply includes a third 12-phase transformer that transforms an AC voltage of the AC power system, and converts the AC power of the third 12-phase transformer into DC power to convert the third Comprising third and fourth AC / DC converters for supplying power to the object;
A first AC voltage detector detects an AC voltage waveform applied between the AC power system and the first DC power supply device, and supplies a gate pulse to the first AC / DC power converter based on the AC voltage detector. A gate pulse controller;
An AC voltage detector detects an AC voltage waveform applied between the AC power system and the second DC power supply device, and based on this, a second pulse is supplied to the second AC / DC power converter. A gate pulse controller;
An AC voltage waveform applied between the AC power system and the third DC power supply device is detected by an AC voltage detector, and based on this, a third pulse is supplied to the third AC / DC power converter. A gate pulse controller;
In a power supply system with
Phase shifting the second transformer 30 degrees relative to the first transformer, phase shifting the third transformer 15 degrees relative to the first transformer, and the first and The phase of the output harmonic waveform of the second power supply device is opposite to that of the second power supply device, and the phase of the output harmonic waveform of the first and third power supply devices is opposite to that of the second power supply device. Power system. A high voltage AC power system, in between at least one first electric power transfer object, and at least one of the first direct-current power supply device that is connected to said first power exchange object,
Between the high-voltage AC power system and zero or even number of second power transfer objects, zero or even number of second DC power supply devices connected to the second power transfer object When,
A low-voltage AC power system disposed via a step-down transformer in the high-voltage AC power system;
Between the low-voltage AC power system and the fifth and sixth power transfer objects, fifth and sixth DC power supply devices connected to the fifth and sixth power transfer objects,
The first DC power supply device includes a six-phase transformer that transforms an AC voltage of the high-voltage AC power system, and converts the AC power of the six-phase transformer into DC power, and the first power transfer object Comprising a first AC / DC power converter for supplying to
Each of the second DC power supply devices includes a 12-phase transformer that transforms an AC voltage of the high-voltage AC power system, and converts the AC power of the 12-phase transformer into DC power to receive the second power transfer target. A second AC / DC converter for supplying each of the objects,
Each of the fifth and sixth DC power supply devices includes a six-phase transformer that transforms an AC voltage of the low-voltage AC power system, and converts the AC power of each of the six-phase transformers into DC power. , Comprising fifth and sixth AC / DC power converters to be supplied for each sixth power transfer object,
An AC voltage detector detects an AC voltage waveform applied to each of the high-voltage AC power system and the first DC power supply device, and supplies a gate pulse to the first AC / DC power converter based on the detected waveform. A first gate pulse controller;
An AC voltage detector detects an AC voltage waveform applied to each of the high-voltage AC power system and the second DC power supply device, and supplies a gate pulse to the second AC / DC power converter based on the detected waveform. A second gate pulse controller;
An AC voltage detector detects an AC voltage waveform applied to each of the low-voltage AC power system and the fifth and sixth DC power supply devices, and the fifth and sixth AC / DC converters based on the detected AC voltage waveform. Fifth and sixth gate pulse controllers for supplying gate pulses to
In a power supply system with
The fifth, and the phase of the sixth one of the output harmonic wave of the direct-current power supply, the first direct-current power supply or said second output harmonic waveform of the DC power supply phase and reverse phase and A power supply system characterized by that. A high voltage AC power system, in between at least one first electric power transfer object, and at least one of the first direct-current power supply device that is connected to said first power exchange object,
Between the high-voltage AC power system and zero or even number of second power transfer objects, zero or even number of second DC power supply devices connected to the second power transfer object When,
A low-voltage AC power system disposed via a step-down transformer in the high-voltage AC power system;
Between the low-voltage AC power system and the fifth and sixth power transfer objects, fifth and sixth DC power supply devices connected to the fifth and sixth power transfer objects,
The first DC power supply device includes a six-phase transformer that transforms an AC voltage of the high-voltage AC power system, and converts the AC power of the six-phase transformer into DC power, and the first power transfer object A first AC / DC power converter for supplying to
Each of the second DC power supply devices includes a 12-phase transformer that transforms an AC voltage of the high-voltage AC power system, and converts the AC power of the 12-phase transformer into DC power to receive the second power transfer target. And a second AC / DC power converter for supplying each of the objects,
Each of the fifth and sixth DC power supply devices includes a six-phase transformer that transforms an AC voltage of the low-voltage AC power system, and converts the AC power of each of the six-phase transformers into DC power. , Comprising fifth and sixth AC / DC power converters to be supplied for each sixth power transfer object,
An AC voltage detector detects an AC voltage waveform applied to each of the high-voltage AC power system and the first DC power supply device, and supplies a gate pulse to the first AC / DC power converter based on the detected waveform. A first gate pulse controller;
An AC voltage detector detects an AC voltage waveform applied to each of the high-voltage AC power system and the second DC power supply device, and supplies a gate pulse to the first AC / DC power converter based on the detected waveform. A second gate pulse controller;
The AC voltage waveform applied to each of the low-voltage AC power system and the fifth and sixth DC power supply devices is detected by an AC voltage detector, and based on this, the fifth and sixth AC / DC power converters are detected. Fifth and sixth gate pulse controllers for supplying gate pulses;
In a power supply system with
The transformer of the first DC power supply device or the transformer of the second DC power supply device is phase-shifted by 30 degrees with respect to any one of the transformers of the fifth and sixth DC power supply devices. A power system characterized by that. A high voltage AC power system, between the first, second electric power transfer object, said first, first that will be connected to each second power exchange object, the second direct-current power supply,
Between the high-voltage AC power system and the third and fourth power transfer objects, third and fourth DC power supply devices connected to the third and fourth power transfer objects,
A first low-voltage AC power system disposed in the high-voltage AC power system via a first step-down transformer;
A second low voltage AC power system disposed in the high voltage AC power system via a second step-down transformer;
Fifth and sixth DC power supply devices connected to each of the fifth and sixth power transfer objects between the first low-voltage AC power system and the fifth and sixth power transfer objects. When,
Seventh and eighth DC power supply devices connected to each of the seventh and eighth power transfer objects between the second low-voltage AC power system and the seventh and eighth power transfer objects. When,
Each of the first DC power supply devices includes a six-phase transformer that transforms an AC voltage of the high-voltage AC power system, and converts the AC power of the six-phase transformer into DC power to receive the first power transfer target. And first and second AC / DC power converters that supply the product,
Each of the third and fourth DC power supply devices includes a 12-phase transformer that transforms an AC voltage of the high-voltage AC power system, and converts the AC power of each of the 12-phase transformers to DC power. The third and fourth AC / DC power converters to be supplied for each fourth power transfer object,
The fifth and sixth DC power supply devices each convert a six-phase transformer that transforms the AC voltage of the first low-voltage AC power system, and converts the AC power of each of the six-phase transformers to DC power. The fifth and sixth AC / DC power converters for supplying each of the fifth and sixth power transfer objects,
Each of the seventh and eighth DC power supply devices converts a six-phase transformer that transforms the AC voltage of the second low-voltage AC power system, and converts the AC power of each of the six-phase transformers to DC power. A seventh and an eighth AC / DC power converter for supplying each of the seventh and eighth power transfer objects;
An AC voltage detector detects an AC voltage waveform applied to each of the high-voltage AC power system and the first and second DC power supply devices, and based on this, the first and second AC / DC power converters are detected. First and second gate pulse controllers for supplying gate pulses respectively;
The AC voltage waveform applied to each of the high-voltage AC power system and the third and fourth DC power supply devices is detected by an AC voltage detector, and based on this, the third and fourth AC / DC power converters are detected. Third and fourth gate pulse controllers for supplying gate pulses, respectively;
An AC voltage detector detects an AC voltage waveform applied to each of the first low-voltage AC power system and the fifth and sixth DC power supply devices, and based on this, the fifth and sixth AC / DC powers are detected. Fifth and sixth gate pulse controllers for supplying gate pulses to the converter;
An AC voltage detector detects an AC voltage waveform applied to each of the second low-voltage AC power system and the seventh and eighth DC power supply devices, and based on this, the seventh and eighth AC / DC powers are detected. Seventh and eighth gate pulse controllers for supplying gate pulses to the converter;
In a power supply system with
The first step-down transformer is not phase-shifted with respect to the six-phase transformer of the first DC power supply device, and the second step-down transformer is phase-shifted by 30 degrees with respect to the first step-down transformer. An apparently 12-phase configuration between the buses of the first and second low voltage AC power systems.

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