CN113824121A

CN113824121A - Topology applied to flexible direct-current comprehensive voltage regulating device for suppressing common-mode interference

Info

Publication number: CN113824121A
Application number: CN202111389702.XA
Authority: CN
Inventors: 杨常战; 于瑞; 徐鹏; 宗国强
Original assignee: Qingdao Topscomm Communication Co Ltd
Current assignee: Qingdao Topscomm Communication Co Ltd
Priority date: 2021-11-23
Filing date: 2021-11-23
Publication date: 2021-12-21
Anticipated expiration: 2041-11-23
Also published as: CN113824121B

Abstract

The invention relates to the field of distribution automation, and particularly discloses a topology for suppressing common mode interference applied to a flexible direct current comprehensive voltage regulating device, which comprises six-phase common mode inductors 1, 2, 4P alternating current circuit breakers 1 and 2, a rectification module, an inversion module, direct current circuit breakers 1 and 2, inductor modules 1 and 2, a three-phase four-wire alternating current power grid and positive and negative direct current lines. The invention solves the problem that the flexible direct current comprehensive voltage regulating device inhibits common mode interference, realizes the isolation of common mode interference signals while regulating the voltage of a power grid, and achieves the aim of regulating the quality of electric energy.

Description

Topology applied to flexible direct-current comprehensive voltage regulating device for suppressing common-mode interference

Technical Field

The invention relates to the technical field of distribution automation, in particular to a topology for suppressing common-mode interference applied to a flexible direct-current comprehensive voltage regulating device.

Background

In recent years, due to the deep progress of new rural construction work and the rapid development of rural economy, the number of high-power electric equipment such as air conditioners, refrigerators, electric cookers, induction cookers and the like in rural residents increases day by day, the rural power consumption demand increases rapidly, and the situations of insufficient power supply capacity, too low terminal voltage of a circuit platform area, reduced voltage quality and reduced power supply reliability of partial rural power grids cause adverse effects on the normal domestic power consumption of residents. Meanwhile, due to the phenomena, part of line equipment, transformers and the like can bear heavy load, the normal demand of resident electricity utilization is difficult to meet, and the normal operation of a rural power grid is not facilitated.

Aiming at the low voltage problem, a plurality of low voltage treatment devices are developed on the market, the voltage performance of a power grid is improved, but the common mode interference problem exists, if the devices generate common mode current on a cable, the cable can generate strong electromagnetic radiation, the electromagnetic interference is generated on electronic and electrical product components, and the performance of the product is influenced; in addition, a larger common-mode interference source exists in the power grid cable, and some treatment equipment does not have better precautionary measures, so that larger interference and potential safety hazards are generated to other electrical equipment, and the service life is shortened.

Disclosure of Invention

Aiming at the defects and defects of the prior art, the invention provides a topology for suppressing common-mode interference applied to the flexible direct-current comprehensive voltage regulating device, solves the problem of suppressing the common-mode interference of the flexible direct-current comprehensive voltage regulating device, realizes the isolation of common-mode interference signals while regulating the voltage of a power grid, achieves the aim of regulating the quality of electric energy, and prolongs the service life of other electrical equipment.

In order to achieve the purpose, the invention provides a topology for suppressing common mode interference applied to a flexible direct current comprehensive voltage regulating device, which comprises six-phase common mode inductors 1, 2, 4P alternating current circuit breakers 1 and 2, a rectification module, an inversion module, direct current circuit breakers 1 and 2, inductor modules 1 and 2, a three-phase four-wire alternating current power grid and positive and negative direct current circuits, wherein:

the six-phase common mode inductor comprises six-phase common mode inductors 1 and 2, wherein 4 input terminals in the six-phase common mode inductors 1 and 2 are respectively connected with a three-phase four-wire alternating current power grid through 4P alternating current circuit breakers 1 and 2, 2 input terminals in the six-phase common mode inductor 1 are connected with positive and negative direct current ends of a rectifier module, 2 input terminals in the six-phase common mode inductor 2 are connected with positive and negative direct current ends of an inverter module, 4 output terminals in the six-phase common mode inductor 1 are connected with three-phase four-wire terminals of the rectifier module, 4 output terminals in the six-phase common mode inductor 2 are connected with the inverter module, and 2 output terminals in the six-phase common mode inductors 1 and 2 are connected with positive and negative direct current wiring terminals of an inductor module; the output terminals of the inductance modules 1 and 2 are respectively connected with the direct current circuit breakers 1 and 2 through copper bars; the dc breaker 1 is interconnected with the dc line of another dc breaker 2 by a dc conductor.

Further, the six-phase common-mode inductors 1 and 2 respectively comprise 6 coils, annular magnetic cores, bases, wire harnesses and terminals which are same in turn number, wire rod, size and winding method, and are key devices of the flexible direct-current comprehensive voltage regulating device for inhibiting common-mode interference topology; the six-phase common mode inductor comprises six-phase common mode inductors 1 and 2, wherein 4 input terminals S1, S2, S3 and S4 of the six-phase common mode inductors 1 and 2 are connected with A, B, C, N of a three-phase four-wire power grid through a 4P alternating current breaker, 4 output terminals F1, F2, F3 and F4 of the six-phase common mode inductors 1 and 2 are connected with A, B, C, N terminals of a rectifying module or an inverting module, 2 input terminals S5 and S6 of the six-phase common mode inductors 1 and 2 are connected with direct current terminals BUS + and BUS-of the rectifying module or the inverting module, and 2 output terminals F5 and F6 of the six-phase common mode inductors 1 and 2 are connected with the direct current terminals BUS + and BUS-of the inductor module.

Further, the topology applied to the flexible direct-current comprehensive voltage regulating device for suppressing the common-mode interference is characterized in that the annular magnetic cores of the six-phase common-mode inductors 1 and 2 are made of ferrite, magnetic powder cores and nanocrystalline materials according to inductance and current characteristics.

Further, the topology applied to the flexible direct current comprehensive voltage regulating device for inhibiting common mode interference is characterized in that the inductance modules 1 and 2 are respectively connected with 2 direct current strong current signals, the 2 direct current strong current signals are respectively connected with a direct current line BUS + and a direct current line BUS-through a wave-blocking inductor and a fuse, and the wave-blocking inductor is mainly used for preventing interference signals of carrier communication.

Further, the topology applied to the flexible direct current comprehensive voltage regulating device for inhibiting common mode interference is characterized in that fuses of the inductance modules 1 and 2 are selected according to the passing current and voltage levels and are mainly used for fusing protection equipment safety under the conditions that direct current lines BUS + and BUS-are in misconnection or short circuit and the like.

Furthermore, the topology applied to the flexible direct-current comprehensive voltage regulating device for suppressing the common-mode interference is characterized in that the inductance value of the six-phase common-mode inductor is selected according to the switching frequency of the rectifier module and the inverter module and the load and impedance performance of a power grid line, the temperature rise characteristic is met when the topology accords with the performance of suppressing the common-mode interference, and the service life is ensured.

The invention has the beneficial technical effects that: the six-phase common mode inductor can inhibit common mode interference, and is mainly characterized in that the six-phase common mode inductor introduces three-phase four-wire and direct current BUS +/BUS-lines of a power grid into the common mode inductor, and magnetic fluxes generated in a magnetic core of the six-phase common mode inductor are mutually offset when normal current flows through the three-phase four-wire power grid lines and the direct current lines; when common mode current flows through the six-phase common mode inductor, due to the isotropy of the common mode current, an equidirectional magnetic field can be generated in the coil to increase the inductance of the coil, so that the coil is high in impedance and generates a strong damping effect, the common mode current is attenuated, the purpose of inhibiting common mode interference is achieved, the problem that the flexible direct current comprehensive voltage regulating device inhibits the common mode interference is solved, the voltage of a power grid is regulated, common mode interference signals generated by a high-frequency switch of a power device of the device are isolated, the pollution to the public power grid is reduced, the meter reading success rate is improved, and the quality of electric energy is regulated.

Drawings

Fig. 1 is a schematic diagram of a topology of the invention applied to a flexible direct current integrated voltage regulator device for suppressing common mode interference.

Fig. 2 is a schematic of a topology utilizing common mode inductance functionality.

Fig. 3 is a schematic diagram of the six-phase common mode inductors 1 and 2 according to the invention.

Reference numerals: 000 be three-phase four-wire AC electric network, 001 is 4P AC circuit breaker 1, and 002 is 4P AC circuit breaker 2, and 010 is six looks common mode inductance 1, and 011 is the rectifier module, and 012 is six looks common mode inductance 2, and 013 is the contravariant module, and 020 is inductance module 1, and 021 is DC circuit breaker 1, and 022 is DC circuit breaker 2, and 023 is inductance module 2.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.

As shown in fig. 1, a topology applied to a flexible dc integrated voltage regulator to suppress common mode interference includes 2 six-phase

common mode inductors

010 and 012, 2 4P

ac circuit breakers

001 and 002, a rectifier module 011, an inverter module 013, 2

dc circuit breakers

021 and 022, 2

inductor modules

020 and 023, a three-phase four-wire ac power grid 000, and positive and negative dc lines BUS + and BUS-; the six-phase common mode inductor 010 is characterized in that 4 input terminals of the six-phase common mode inductor 010 are connected with a three-phase four-wire alternating current power grid 000 through a 4P alternating current circuit breaker 001, 2 input terminals of the six-phase common mode inductor 010 are connected with a positive direct current terminal BUS + and a negative direct current terminal BUS-of a rectification module 011, 4 output terminals of the six-phase common mode inductor 010 are connected with a three-phase four-wire terminal A, B, C, N of the rectification module 011, and 2 output terminals of the six-phase common mode inductor 010 are connected with a positive direct current terminal and a negative direct current terminal of an inductor module 020; the inductance module 020 comprises 2 wave choke inductors, 2 fuses, an input wiring terminal and an output wiring terminal; the input terminal of the inductance module 020 is connected with six-phase common mode inductance 010 direct current output terminals BUS + and BUS-, and the positive and negative direct current output terminals of the inductance module 020 are connected with a direct current breaker 021 through a copper bar; the six-phase common mode inductor 012 is characterized in that 4 input terminals of the six-phase common mode inductor 012 are connected with a three-phase four-wire alternating current power grid 000 through a 4P alternating current circuit breaker 002, 2 input terminals of the six-phase common mode inductor 012 are connected with a direct current terminal BUS + and BUS-of an inverter module 013, 4 output terminals of the six-phase common mode inductor 012 are connected with a three-phase four-wire terminal A, B, C, N of the inverter module 013, and 2 output terminals of the six-phase common mode inductor 012 are connected with a direct current terminal BUS + and BUS-of an inductor module 023; the output terminals BUS + and BUS-of the inductance module 023 are connected with a direct current breaker 022 through copper bars; the dc breaker 022 is connected to another dc breaker 021 via dc lines BUS + and BUS-.

As shown in fig. 3, the six-phase

common mode inductor

010 or 012 includes: 6 coils, annular magnetic cores, bases, wire harnesses and terminals which are the same in number of turns, wire rods, size and winding method are key devices of the flexible direct-current comprehensive voltage regulating device for inhibiting common-mode interference topology; 4 input terminals S1, S2, S3 and S4 of the six-phase common mode inductor 010 are connected with A, B, C, N of a three-phase four-wire alternating current power grid 000 through a 4P alternating current breaker 001, 4 output terminals F1, F2, F3 and F4 of the six-phase common mode inductor 010 are connected with A, B, C, N terminals of a rectification module 011, 2 input terminals S5 and S6 of the six-phase common mode inductor 010 are connected with a direct current terminal BUS + and BUS-of the rectification module 011, and 2 output terminals F5 and F6 of the six-phase common mode inductor 010 are connected with a direct current terminal BUS + and BUS-of the inductance module 020; the six-phase common mode inductor 012 is connected in the same manner in the topology, 4 input terminals S1, S2, S3, S4 of the six-phase common mode inductor 012 are connected to A, B, C, N of a three-phase four-wire ac power grid 000 through a 4P ac breaker 002, 4 output terminals F1, F2, F3, F4 of the six-phase common mode inductor 012 are connected to A, B, C, N terminal of an inverter module 013, 2 input terminals S5 and S6 of the six-phase common mode inductor 012 are connected to dc terminals BUS + and BUS of the inverter module 013, and 2 output terminals F5 and F6 of the six-phase common mode inductor 012 are connected to dc terminals BUS + and BUS-of the inductor module 023.

As shown in fig. 2, when the six-phase

common mode inductor

010 or 012 uses 4 phases of the

common mode inductor

010 or 012, a three-phase four-wire A, B, C, N wire harness of the three-phase four-wire ac power grid 000 is led into the six-phase

common mode inductor

010 or 012, a dc output dc line BUS + and BUS-of the rectifier module 011 and the inverter module 013 do not pass through the six-phase

common mode inductor

010 or 012, since the rectifier module 011 and the inverter module 013 are N-line shunted during operation, several tens of amperes of ac current exist on the dc line including a bundle of lines of BUS + and BUS-, a flux increment generated by the three-phase four-wire A, B, C, N of the three-phase four-wire ac power grid 000 on the six-phase

common mode inductor

010 or 012 is not 0, the six-phase

common mode inductor

010 or 012 is easily damaged by magnetic saturation, and the present invention can prevent the N-line loop current from causing the damage of the common mode inductor itself by magnetic saturation.

In addition, the annular magnetic core of the six-phase

common mode inductor

010 or 012 selects materials such as ferrite, magnetic powder core, nanocrystalline and the like according to inductance and current characteristics, and the materials are selected according to factors such as working temperature, frequency range, cost and the like, and the size of the magnetic core is firstly verified, a material with proper magnetic conductivity is selected, and then the inductance is calculated.

As shown in fig. 1, the

inductance module

020 or 023 is connected with 2 direct current strong wires BUS + and BUS-, one direct current strong wire is connected with a BUS + connection wire through a wave-blocking inductance and a fuse, the other direct current strong wire is connected with a BUS-connection wire through a wave-blocking inductance and a fuse, the wave-blocking inductances at two ends of the BUS + connection wire and the BUS-connection wire are mainly used for preventing interference signals of carrier communication, and inductance values of the wave-blocking inductance at the direct current side are designed according to wave-blocking frequency to ensure the quality of carrier communication; on BUS + line and BUS-line, the fuse is used for fusing the safety of the protection equipment under the conditions of wrong connection of direct current lines BUS + and BUS-or short circuit of BUS + and BUS-and the like, is selected according to the passing current and voltage level, and is designed with a related protection circuit according to the direct current voltage value on the line in addition, so that the frequent shutdown of the equipment or the damage of the equipment caused by larger transient voltage or current impulse pulse is prevented.

In the topology, the 4P

ac circuit breakers

001 and 002 or the

dc circuit breakers

021 and 022 should be selected according to the maximum current passing capacity and the breaking current capacity, and the N-phase terminal services of the 4P

ac circuit breakers

001 and 002 are necessarily connected to the N line of the three-phase four-wire ac power grid 000, and should have sufficient breaking capacity and operation safety, and the rated capacity should have a sufficient current margin.

Furthermore, the inductance values of the six-phase common-

mode inductors

010 and 012 are selected according to the switching frequency of the rectifier module 011 and the inverter module 013 and the load and impedance performance of the power grid line, so that the temperature rise characteristic is met when the common-mode interference suppression performance is met, and the service life is ensured.

The invention solves the problem that the flexible direct current comprehensive voltage regulating device inhibits common mode interference, realizes the purpose of regulating the voltage of a power grid to solve the problem of low voltage of a terminal user, and simultaneously isolates common mode interference signals generated by a power device IGBT high-frequency switch of the device, thereby achieving the purposes of reducing pollution to the public power grid, improving the meter reading success rate and regulating the quality of electric energy.

The above-mentioned embodiments are illustrative of the specific embodiments of the present invention, and are not restrictive, and those skilled in the relevant art can make various changes and modifications to obtain corresponding equivalent technical solutions without departing from the spirit and scope of the present invention, so that all equivalent technical solutions should be included in the scope of the present invention.

Claims

1. The utility model provides a be applied to flexible direct current and synthesize voltage regulator and restrain topology of common mode interference, contains six looks common mode inductance 1, 2, 4P alternating current circuit breaker 1, 2, rectifier module, contravariant module, direct current circuit breaker 1, 2, inductance module 1, 2, three-phase four-wire alternating current electric network, positive and negative direct current circuit, prevents that N wire loop current from leading to common mode inductance itself because magnetic saturation damages its characterized in that:

each 4 input terminals of the six-phase common mode inductors 1 and 2 are respectively connected with a three-phase four-wire alternating current power grid through 4P alternating current circuit breakers 1 and 2, 2 input terminals of the six-phase common mode inductor 1 are connected with positive and negative direct current ends of a rectification module, 2 input terminals of the six-phase common mode inductor 2 are connected with positive and negative direct current ends of an inversion module, 4 output terminals of the six-phase common mode inductor 1 are connected with three-phase four-wire terminals of the rectification module, 4 output terminals of the six-phase common mode inductor 2 are connected with the inversion module, and 2 output terminals of the six-phase common mode inductors 1 and 2 are connected with positive and negative direct current wiring terminals of an inductor module;

the output terminals of the inductance modules 1 and 2 are respectively connected with the direct current circuit breakers 1 and 2 through copper bars;

the dc breaker 1 is interconnected with the dc line of another dc breaker 2 by a dc conductor.

2. The topology for suppressing the common-mode interference applied to the flexible direct-current comprehensive voltage regulating device is characterized in that the six-phase common-mode inductors 1 and 2 respectively comprise 6 coils, annular magnetic cores, bases, wire harnesses and terminals with the same number of turns, wires, size and winding method, and are key devices of the topology for suppressing the common-mode interference of the flexible direct-current comprehensive voltage regulating device; the six-phase common mode inductor comprises 4 input terminals S1, S2, S3 and S4, wherein the 4 input terminals S1, S2, S3 and S4 are connected to A, B, C, N of a three-phase four-wire power grid through a 4P alternating current breaker, 4 output terminals F1, F2, F3 and F4 of the six-phase common mode inductor are connected to A, B, C, N terminals of a rectifying module or an inverter module, 2 input terminals S5 and S6 of the six-phase common mode inductor are connected to BUS + and BUS-of the rectifying module or the inverter module, and 2 output terminals F5 and F6 of the six-phase common mode inductor are connected to BUS + and BUS-of the inductor module.

3. The topology applied to the flexible direct-current comprehensive voltage regulating device for suppressing the common-mode interference according to claim 2 is characterized in that the annular magnetic cores of the six-phase common-mode inductors 1 and 2 are made of ferrite, magnetic powder cores and nanocrystalline materials according to inductance and current characteristics.

4. The topology applied to the flexible direct current integrated voltage regulation device for suppressing the common mode interference according to claim 1, wherein the inductance modules 1 and 2 are respectively connected with 2 direct current strong electric signals, and the 2 direct current strong electric signals are respectively connected with a direct current line BUS + and a direct current line BUS-through a wave-blocking inductor and a fuse.

5. The topology applied to the flexible direct current integrated voltage regulating device for suppressing the common mode interference as claimed in claim 1, wherein the wave choke inductor is used for preventing the interference signal of the carrier communication.

6. The topology applied to the flexible direct current comprehensive voltage regulating device for suppressing the common mode interference as claimed in claim 1, wherein the fuse is selected according to the passing current and voltage levels and is used for fusing the safety of a protection device in the case of misconnection or short circuit of a direct current line.

7. The topology applied to the flexible direct-current comprehensive voltage regulating device for suppressing the common-mode interference according to claim 1 is characterized in that the inductance value of the six-phase common-mode inductor is selected according to the switching frequency of the rectifying module and the inverting module and the load and impedance performance of a power grid line, the temperature rise characteristic is met when the topology accords with the performance of suppressing the common-mode interference, and the service life is ensured.