阅读说明：本技术 产生均匀分布十二相位离散调相单相电压的系统及方法 (System and method for generating uniformly-distributed twelve-phase discrete phase-modulation single-phase voltage ) 是由 刘晓庄 张文忠 仇永军 戴大春 于 2021-08-28 设计创作，主要内容包括：本发明提供产生均匀分布十二相位离散调相单相电压的系统及方法,涉及交流电源技术领域。该产生均匀分布十二相位离散调相单相电压的系统及方法,包括三相变压器,所述三相变压器内部设置有原边绕组,所述三相变压器内部设置有副边绕组,所述原边绕组的输入端连接有变压器输入端,所述副边绕组电性连接有变压器三相四线输出端。通过采用三相对称电源三相电源构造成的三相四线制电源系统的三相变压器来产生均匀分布十二相位离散调相单相电压,使用的时候成本低,抗冲击性强,能够实现大容量输出,运行稳定、可靠,实用性强。(The invention provides a system and a method for generating uniformly-distributed twelve-phase discrete phase-modulation single-phase voltage, and relates to the technical field of alternating-current power supplies. The system and the method for generating the uniformly distributed twelve-phase discrete phase-modulated single-phase voltage comprise a three-phase transformer, wherein a primary winding is arranged inside the three-phase transformer, a secondary winding is arranged inside the three-phase transformer, the input end of the primary winding is connected with the input end of the transformer, and the secondary winding is electrically connected with the three-phase four-wire output end of the transformer. The three-phase transformer of the three-phase four-wire system power supply system constructed by the three-phase symmetrical power supply three-phase power supply is used for generating uniformly distributed twelve-phase discrete phase modulation single-phase voltage, and the three-phase transformer has the advantages of low cost and strong impact resistance when in use, can realize large-capacity output, and is stable and reliable in operation and strong in practicability.)

1. System for producing twelve-phase discrete phase modulation single-phase voltage with uniform distribution, comprising a three-phase transformer (2), characterized in that: the three-phase transformer is characterized in that a primary winding (3) is arranged inside the three-phase transformer (2), a secondary winding (4) is arranged inside the three-phase transformer (2), the input end of the primary winding (3) is connected with a transformer input end (1), and the secondary winding (4) is electrically connected with a three-phase four-wire output end (5) of the transformer.

2. The system for generating a uniformly distributed twelve-phase discrete phase modulated single phase voltage of claim 1, wherein: the primary winding (3) can be in a star connection mode or a triangular connection mode, and the secondary winding (4) is in a star connection mode with a neutral point N led out.

3. The system for generating a uniformly distributed twelve-phase discrete phase modulated single phase voltage of claim 1, wherein: the transformer input end (1) is connected with a QF control switch (9) through an electric wire, and the QF control switch (9) is connected with a three-phase symmetrical power supply (10) through an electric wire.

4. The system for generating a uniformly distributed twelve-phase discrete phase modulated single phase voltage of claim 1, wherein: the three-phase four-wire output end (5) of the transformer is respectively and electrically connected with a first phase selection and switching control device (6) and a second phase selection and switching control device (7).

5. The system for generating a uniformly distributed twelve-phase discrete phase modulated single phase voltage of claim 4, wherein: the first phase selecting and switching control device (6) is electrically connected with a phase modulation output terminal (8).

6. The system for generating a uniformly distributed twelve-phase discrete phase modulated single phase voltage of claim 4, wherein: and the second phase selection and switching control device (7) is electrically connected with a phase modulation output terminal (8).

7. The system for generating a uniformly distributed twelve-phase discrete phase modulated single phase voltage of claim 5, wherein: and the phase modulation output terminal (8) is internally provided with two terminals a and x, wherein the terminal a is electrically connected with the first phase selection and switching control device (6), and the terminal x is electrically connected with the second phase selection and switching control device (7).

8. Method of operating a system for generating a uniformly distributed twelve-phase discretely phase modulated single-phase voltage according to claim 1, characterized in that: the method comprises the following steps:

the method comprises the following steps: a, B, C three-phase symmetrical voltage provided by a three-phase symmetrical power supply (10) is utilized and controlled by a QF control switch (9), the QF control switch (9) is connected to R, S, T of a primary winding (3) in a three-phase transformer (2) through a transformer input end (1), the primary winding (3) can be in a triangular connection mode or a star connection mode, a secondary winding (4) is in a star connection mode and is provided with a neutral point N, and terminals U, V, W and N are four output ends of a three-phase four-wire output end (5) of the secondary winding (4), so that the three-phase four-wire power supply system can output phase voltage, namely, any phase of U, V, W is output with the neutral point N, and can also output the line voltage, namely, any two phases of U, V, W are output;

step two: a transformer three-phase four-wire output end (5) is respectively connected with a first phase selection and switching control device (6) and a second phase selection and switching control device (7), an a terminal and an x terminal in a phase modulation output terminal (8) can be respectively selected and switched to be connected with U, V, W and any one of N terminals, the first phase selection and switching control device (6) and the second phase selection and switching control device (7) can respectively regulate and control the a terminal and the x terminal, when the a terminal and the x terminal are respectively connected with terminals of voltage subscripts in a table below to output single-phase voltage, twelve voltage vectors of discrete phases can be generated, the voltage vectors are uniformly distributed in a 360-degree periodic plane, and the phases are sequentially different by 30 degrees.

Technical Field

The invention relates to the technical field of alternating current power supplies, in particular to a system and a method for generating uniformly distributed twelve-phase discrete phase modulation single-phase voltage.

Background

The common power supply mode in the power system is three-phase or single-phase alternating current power supply, and the output voltage phase is less and is fixed and not adjustable.

The conventional phase-adjustable voltage output device is a signal generator, the output phase of the conventional phase-adjustable voltage output device is generally continuously adjusted, and the difficulty in controlling the output specific phase is higher; the output frequency is generated by the synthesis of an internal oscillating circuit or a digital signal, is difficult to strictly follow the frequency of an external signal (voltage), and is influenced by the stability (parameters) of elements such as a system oscillator and the like and the temperature of a working environment; the phase adjustment performed by the phase shifting method has relatively poor stability, is easily influenced by the parameter change of circuit elements, and is complex to control. In addition, the signal generator is a signal-level power supply, the output power of the signal generator is watt-level and very small, and if a high-power co-frequency phase modulation voltage power supply of tens to hundreds of kilowatts needs to be obtained, a large number of power electronic devices (mainly a diode rectifier, a filter, a large number of power triodes and a driving signal generation and system control circuit) need to be utilized for rectification, filtering and inversion to realize power amplification, which greatly reduces the reliability of the system, and has a complex structure and low efficiency.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a system and a method for generating uniformly distributed twelve-phase discrete phase modulation single-phase voltage, and solves the problems that the output specific phase of an adjustable voltage output device is difficult to control, is easily influenced by the parameter change of circuit elements, is complex to control, has low system reliability and is low in efficiency.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: the system and the method for generating the uniformly distributed twelve-phase discrete phase-modulated single-phase voltage comprise a three-phase transformer, wherein a primary winding is arranged inside the three-phase transformer, a secondary winding is arranged inside the three-phase transformer, the input end of the primary winding is connected with the input end of the transformer, and the secondary winding is electrically connected with the three-phase four-wire output end of the transformer.

Preferably, the primary winding may be in a star connection mode or a delta connection mode, and the secondary winding is in a star connection mode with a neutral point N led out.

Preferably, the input end of the transformer is connected with a QF control switch through an electric wire, and the QF control switch is connected with a three-phase symmetrical power supply through an electric wire.

Preferably, the three-phase four-wire output end of the transformer is electrically connected with a first phase selection and switching control device and a second phase selection and switching control device respectively.

Preferably, the first phase selecting and switching control device is electrically connected with a phase modulation output terminal.

Preferably, the second phase selection and switching control device is electrically connected with a phase modulation output terminal.

Preferably, two terminals a and x are arranged in the phase modulation output terminal, wherein the terminal a is electrically connected with the first phase selection and switching control device, and the terminal x is electrically connected with the second phase selection and switching control device.

Preferably, the method of operating a system for generating a uniformly distributed twelve-phase discrete phase modulated single phase voltage comprises the steps of:

the method comprises the following steps: a, B, C three-phase symmetrical voltage provided by a three-phase symmetrical power supply is controlled by a QF control switch and is connected to the input end R, S, T of a primary winding in a three-phase transformer, the primary winding can be in a triangular connection mode or a star connection mode, a neutral point N is arranged on a secondary winding and the three-phase four-wire output end of the transformer in an electric connection mode, and the wiring ends of the three-phase four-wire output end of the transformer are U, V, W and four output terminals N, so that the three-phase four-wire power supply system can output phase voltage, namely, any phase of U, V, W is output with the neutral point N, and can also output line voltage, namely, any two phases of U, V, W are output;

step two: the transformer three-phase four-wire output end is respectively connected with a first phase selection and switching control device and a second phase selection and switching control device, an a terminal and an x terminal in a phase modulation output terminal can be respectively connected with U, V, W and any one of N terminals in a selective and switching mode, the first phase selection and switching control device and the second phase selection and switching control device can respectively regulate the a terminal and the x terminal, when the a terminal and the x terminal are respectively connected with terminals of voltage subscripts in a table below to output single-phase voltage, voltage vectors of twelve discrete phases can be generated, the voltage vectors are uniformly distributed in a 360-degree periodic plane, and the phases sequentially differ by 30 degrees.

(III) advantageous effects

The invention provides a system and a method for generating uniformly distributed twelve-phase discrete phase-modulated single-phase voltage.

The method has the following beneficial effects:

1. the invention adopts the three-phase transformer which constructs an external three-phase power supply into a three-phase four-wire system power supply system, and the three-phase four-wire output end of the transformer for changing the output wiring mode of the three-phase four-wire system power supply to flexibly regulate and control, regulates and controls the flexible use of the output terminal through the first phase selection and switching control device and the second phase selection and switching control device, does not adopt power electronic power devices and related conversion control technologies thereof, and has the advantages of low cost when in use, strong impact resistance, stable and reliable operation and strong practicability, and can realize large-capacity output.

2. The invention controls the capacity of single-phase output by adjusting the power supply capacity of R, S, T in the input end of the transformer and the capacity of the three-phase transformer, thereby having wider capacity range, strong adaptability and practicability.

3. The invention does not relate to power electronic transformation and control technologies such as power circuit rectification, filtering, inversion, phase locking and the like, does not need to adopt power electronic power devices, has low cost, simple control, high working reliability, impact resistance and stable performance, avoids the defects of easy damage of the power devices, low working reliability and the like of the traditional linear power amplification type power electronic phase modulation power supply device, and the like, and the power voltage generated by the scheme is easy to realize high-power output and has extremely high reliability, stability and practicability.

4. The invention can output phase voltage and line voltage, and change the output mode and direction of the three-phase four-wire system power supply by using the first phase selection and switching control device and the second phase selection and switching control device, thus generating twelve phase discretely distributed single-phase voltages.

5. The invention constructs a three-phase four-wire system power supply system from a three-phase power supply by using a three-phase transformer and an internal primary winding and an internal secondary winding thereof, thereby generating uniformly distributed twelve-phase discrete phase-modulated single-phase voltage. If the power supply is a three-phase four-wire system and the capacity meets the requirement, the power supply can be directly utilized, and the power supply is worth popularizing.

Drawings

FIG. 1 is a block diagram of the system of the present invention;

FIG. 2 is a plane distribution diagram of the output voltage vector of the present invention.

Wherein, 1, transformer input end; 2. a three-phase transformer; 3. a primary winding; 4. a secondary winding; 5. a three-phase four-wire output end of the transformer; 6. a first phase selection and switching control device; 7. a second phase selection and switching control device; 8. a phase modulation output terminal; 9. a QF control switch; 10. three-phase symmetrical power supply.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example (b):

as shown in fig. 1-2, an embodiment of the present invention provides a system for generating a uniformly distributed twelve-phase discrete phase-modulated single-phase voltage, including a three-phase transformer 2, a primary winding 3 is disposed inside the three-phase transformer 2, a secondary winding 4 is disposed inside the three-phase transformer 2, an input end of the primary winding 3 is connected to a transformer input end 1, the secondary winding 4 is electrically connected to a three-phase four-wire output end 5 of the transformer, and there are no processing links such as rectification, filtering, inversion, etc. for a main circuit of a power supply, so that the system is low in cost, strong in impact resistance, high in reliability, and the output frequency is strictly consistent with the input frequency, and the output waveform is the same as the input waveform, and twelve phases are uniformly distributed in a cycle plane of 360 ° and have a phase difference of 30 ° in sequence;

the three-phase four-wire output terminal 5 of the transformer is constructed to output either a phase voltage (U, V, W or relative neutral point N) or a line voltage (between any two phases). When the power supply R, S, T is symmetrically input in three phases, the output three-phase voltage U, V, W is also symmetrical and has a phase difference of 120 degrees in sequence according to the electromagnetic induction principle and the vector operation rule; when different power supply phase modulation output terminals 8 and direction outputs are adopted between U, V, W and N by using the first phase selection and switching control device 6 and the second phase selection and switching control device 7, voltage vectors of twelve phases can be generated, and the phases are sequentially different by 30 degrees.

The primary winding 3 can be in a star connection mode or a triangular connection mode, and the secondary winding 4 is in a star connection mode with a neutral point N led out.

The transformer input end 1 is connected with a QF control switch 9 through an electric wire, the QF control switch 9 is connected with a three-phase symmetrical power supply 10 through an electric wire, the capacity of three phases of a power supply A, B, C is controlled, the three-phase symmetrical power supply 10 with proper capacity, the transformer input end 1 and the three-phase transformer 2 are selected, the capacity of a phase modulation output terminal 8 can be guaranteed, and high-capacity output can be achieved.

The three-phase four-wire output end 5 of the transformer is respectively and electrically connected with a first phase selection and switching control device 6 and a second phase selection and switching control device 7.

The first phase selecting and switching control device 6 is electrically connected with a phase modulation output terminal 8.

The second phase selecting and switching control device 7 is electrically connected with a phase modulation output terminal 8.

A phase modulation output terminal 8 is internally provided with two terminals a and x, wherein the terminal a is electrically connected with the first phase selection and switching control device 6, and the terminal x is electrically connected with the second phase selection and switching control device 7;

the scheme does not relate to a power supply rectification, inversion conversion or conversion control mechanism, and the three-phase transformer 2 only performs voltage conversion and does not change the output frequency of the power supply, so that the output frequency is the same as the input frequency, the output frequency and the input frequency are strictly consistent, and the use is convenient.

In the embodiment shown in fig. 1, the terminal a and the terminal x are the single-phase modulation output terminal 8 of the present invention, and these two terminals can be selectively and switchably connected to any one of the terminals U, V, W and N by the first phase selection and switching control device 6 and the second phase selection and switching control device 7, respectively. Through the first phase selection and switching control device 6 and the second phase selection and switching control device 7 of the three-phase four-wire output end 5 of the transformer, when a terminal a and a terminal x are respectively connected with terminals of voltage subscripts in the following table to output single-phase voltage, voltage vectors of twelve discrete phases can be generated, and the voltage vectors are uniformly distributed in a 360-degree periodic plane and sequentially differ by 30 degrees. In the following, taking the reference vector with the U-phase voltage UN of 0 ° as an example, the phases corresponding to the twelve phase discrete output voltages are shown in table one, and the vector plane distribution diagram is shown in fig. 2.

A method of operating a system for generating a uniformly distributed twelve-phase discrete phase modulated single phase voltage, comprising the steps of:

the method comprises the following steps: a, B, C three-phase symmetrical voltage provided by a three-phase symmetrical power supply 10 is controlled by a QF control switch 9, the QF control switch 9 is connected to the input end R, S, T of a primary winding 3 in a three-phase transformer 2 through a transformer input end 1, the primary winding 3 can be in a triangular connection mode or a star connection mode, a secondary winding 4 and a transformer three-phase four-wire output end 5 are electrically connected and provided with a neutral point N, and the wiring end of the transformer three-phase four-wire output end 5 is U, V, W and N four terminals, so that the three-phase four-wire power supply system can output phase voltage, namely, either one phase of U, V, W outputs with the neutral point N, or output line voltage, namely, either two phases of U, V, W outputs;

step two: the transformer three-phase four-wire output end 5 is respectively connected with a first phase selection and switching control device 6 and a second phase selection and switching control device 7, an a terminal and an x terminal in a phase modulation output terminal 8 can be respectively selected and switched to be connected with any one of U, V, W and N terminals, the first phase selection and switching control device 6 and the second phase selection and switching control device 7 can respectively regulate the a terminal and the x terminal, when the a terminal and the x terminal are respectively connected with terminals of voltage subscripts in the following table to output single-phase voltage, twelve voltage vectors of discrete phases can be generated, and the voltage vectors are uniformly distributed in a 360-degree periodic plane and sequentially differ by 30 degrees.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.