CN114336718A - Three-pole low-voltage direct-current power distribution system - Google Patents
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Abstract
The invention discloses a three-pole low-voltage direct current distribution system, which comprises: the power supply comprises an alternating current power supply unit, a rectifying unit for converting electric energy into direct current voltage, a direct current power transmission unit and an inversion unit; the alternating current power supply unit is connected with the rectifying unit, the output side of the rectifying unit is connected with the direct current power transmission unit, and the direct current power transmission unit is connected with the input side of the inverting unit; the power transmission line of the direct current power transmission unit is a three-phase line, and the three-phase line respectively corresponds to the positive line, the negative line and the modulation electrode line; the direct current transmission unit comprises a controllable switch, and the controllable switch is used for controlling the modulation pole line to be alternately connected in parallel with the positive pole line and the negative pole line. The invention effectively improves the maximum power transmission capability of the system by adding the modulating electrode circuit and alternately transmitting the modulating electrode circuit and the positive electrode circuit in parallel.
Description
Technical Field
The invention relates to the technical field of power supply systems, in particular to a three-pole low-voltage direct-current power distribution system.
Background
Along with the improvement of the living standard of people, the household loads are increasingly diversified, so that the centralized starting of high-power loads causes obvious voltage drop of a remote distribution line, and the problem of voltage drop of a remote end user is obvious. In addition, the starting of various high-power electric loads is often periodic, so that the problem of low terminal voltage occurs periodically, and the problem is remarkably aggravated due to the time concentration, and the daily life and the production and the electricity utilization of residents are influenced.
In order to solve the problem of low voltage at the end, the existing solutions mainly comprise:
(1) a10 kV line and a transformer are added, namely a power supply point is newly added, line transformation is carried out simultaneously, and the power supply radius is shortened. The method can solve the low voltage problem from the root, but the method has huge investment and long implementation time, and the line crosses the mountain area, so that the green vegetation of the mountain grows rapidly, the ground short circuit fault is easily caused, and the operation and maintenance work in the later period is increased.
(2) The photovoltaic power generation device and the energy storage device are arranged at the tail end of the user, namely, a new power supply is arranged on the side of the user to improve the voltage of the user, the power is prevented from being transmitted for a long distance through the original power transmission line, and the voltage drop can be reduced. However, the photovoltaic energy storage device has high cost and long investment return period, and the rural area faces the land acquisition problem.
(3) And installing a reactive power compensation device. Reactive compensation is additionally arranged in an inductive load dense area or a line inductive reactance larger occasion, voltage drop caused by reactive power is reduced, and the construction cost is lower. The voltage boost is limited and the application scenarios are limited.
(4) A series voltage regulator and a load voltage regulator. And a series voltage regulator is additionally arranged on a line with an overlong power supply radius to regulate the voltage at the tail end. A load voltage regulator is additionally arranged at the initial end of the line, so that the initial end voltage is increased. The adjusting range is limited, and the low voltage problem of the low voltage scene cannot be solved.
Disclosure of Invention
The invention aims to provide a three-pole low-voltage direct-current power distribution system to solve the problems of high investment cost and limited power transmission capacity caused by low terminal voltage in the prior art.
To achieve the above object, the present invention provides a three-pole low-voltage dc power distribution system, including: the power supply comprises an alternating current power supply unit, a rectifying unit for converting electric energy into direct current voltage, a direct current power transmission unit and an inversion unit;
the alternating current power supply unit is connected with the rectifying unit, the output side of the rectifying unit is connected with the direct current power transmission unit, and the direct current power transmission unit is connected with the input side of the inverting unit;
the power transmission line of the direct current power transmission unit is a three-phase line, and the three-phase line corresponds to the positive line, the negative line and the modulation electrode line respectively;
the direct current transmission unit comprises a controllable switch, and the controllable switch is used for controlling the modulation pole line to be alternately connected with the positive pole line and the negative pole line in parallel.
Preferably, the controllable switches include a first controllable switch and a second controllable switch located at an output side of the rectification unit, and a third controllable switch and a fourth controllable switch located at an input side of the inversion unit.
Preferably, the first controllable switch and the third controllable switch are closed, the second controllable switch and the fourth controllable switch are opened, and the system is in a working mode that the modulation pole line is connected with the positive pole line in parallel.
Preferably, the second controllable switch and the fourth controllable switch are closed, the first controllable switch and the third controllable switch are opened, and the system is in a working mode that the modulation pole line is connected with the negative pole line in parallel.
Preferably, the rectifying unit comprises an AC/DC rectifier, the inverting unit comprises a DC/AC inverter, and the AC/DC rectifier and the DC/AC inverter adopt a three-phase two-level full-bridge topology.
Preferably, the rectifying unit comprises an AC/DC rectifier, the inverting unit comprises a DC/AC inverter, and the AC/DC rectifier and the DC/AC inverter adopt a three-phase three-level full-bridge topology.
Preferably, a rectifier is further connected in series on the modulation pole line, and the rectifier is connected in series with a three-phase alternating current source to construct a controllable voltage source, and the controllable voltage source is used for controlling the power flow direction of the modulation pole line.
Preferably, the rectifier connected in series with the modulation electrode is a three-phase double full-bridge rectifier converter, the three-phase double full-bridge rectifier converter adopts two single full-bridge rectifiers to connect, and the output voltage and the output current of the three-phase double full-bridge rectifier converter determine the forward output or the reverse output according to the current polarity change of the modulation electrode circuit.
Preferably, the single-phase alternating current source is connected with a single-phase double full-bridge rectifier converter connected in series on the modulation electrode to construct a controllable voltage source, and the controllable voltage source is used for controlling the power flow direction of the modulation electrode circuit.
Preferably, the three-pole low-voltage dc distribution system further includes an equivalent load, and the equivalent load is connected to the output side of the inverter unit.
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts the rectifier to convert the electric energy into the direct current voltage in the alternating current distribution core area, adopts the controllable switch to control the modulation polar line to be alternately connected with the anode line and the cathode line in parallel in the middle direct current transmission link, improves the power transmission capability of the three-pole low-voltage direct current distribution system because of adopting three distribution lines, effectively improves the maximum power transmission capability of the improved direct current distribution system by fully utilizing the power transmission capability of the transmission line of the original alternating current distribution system, and fully considers the flexible direct current technology of power electronization.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a three-pole low-voltage dc power distribution system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a three-pole low-voltage dc power distribution system according to another embodiment of the present invention.
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.
It should be understood that the step numbers used herein are for convenience of description only and are not intended as limitations on the order in which the steps are performed.
It is to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the invention provides a three-pole low-voltage dc power distribution system, including: the direct current power transmission system comprises an alternating current power supply unit 100, a rectifying unit 200 for converting electric energy into direct current voltage, a direct current transmission unit 300 and an inversion unit 400, wherein the alternating current power supply unit 100 is connected with the rectifying unit 200, the output side of the rectifying unit 200 is connected with the direct current transmission unit 300, the direct current transmission unit 300 is connected with the input side of the inversion unit 400, the power transmission line of the direct current transmission unit 300 is a three-phase line, the three-phase line corresponds to a positive line, a negative line and a modulation electrode line respectively, and the direct current transmission unit comprises a controllable switch for controlling the modulation electrode line to be connected with the positive line and the negative line alternately in parallel. A three-pole low-voltage dc distribution system further includes an equivalent load connected in series with the output side of the inverter unit 400.
It should be noted that the power transmission line further includes A, B, C three phases of the original ac power transmission line, and the positive electrode line, the negative electrode line, and the modulation pole line are respectively corresponding to any one of the three lines of the original ac power transmission line A, B, C, and no specific specification is made for the three lines. The controllable switches comprise four switching devices, namely a first controllable switch S11, a second controllable switch S12, a third controllable switch S21 and a fourth controllable switch S22, and a fully-controlled switching device can be selected. The first controllable switch S11 and the second controllable switch S12 are connected to the output side of the rectifying unit 200, and the third controllable switch S21 and the fourth controllable switch S22 are connected to the input side of the inverting unit 400. The controllable switches are used for controlling the modulation pole circuit to be alternately connected in parallel with the positive pole circuit and the negative pole circuit, specifically, when the first controllable switch S11 and the third controllable switch S21 are closed and the second controllable switch S12 and the fourth controllable switch S22 are opened, the modulation pole circuit is connected in parallel with the positive pole circuit, the sum of currents flowing through the positive pole circuit and the modulation pole circuit is equal to the current flowing through the negative pole circuit, and the negative pole circuit is equal to the maximum current flowing through the negative pole circuit; when the second controllable switch S12, the fourth controllable switch S22 are closed and the first controllable switch S11, the third controllable switch S21 are open, the modulated pole line is connected in parallel with the negative pole line, and the sum of the currents flowing through the negative pole line and the modulated pole line is equal to the current flowing through the positive pole line.
In the embodiment, the controllable switch is used for controlling the modulation polar line to be alternately connected in parallel with the positive electrode line and the negative electrode line, so that the power transmission of the power transmission line of the original alternating current power distribution system is fully utilized, and the maximum power transmission capability of the system is effectively improved.
In an embodiment, the controllable switches include a first controllable switch S11 and a second controllable switch S12 on the output side of the rectifying unit 200, and a third controllable switch S21 and a fourth controllable switch S22 on the input side of the inverting unit 400.
Specifically, the first controllable switch S11 and the second controllable switch S12 are located at the output side of the rectifying unit 200, and the third controllable switch S21 and the fourth controllable switch S22 are located at the input side of the inverting unit 400. The first S11, second S12, third S21 and fourth S22 controllable switches enable switching between a parallel connection of the positive line and the modulation pole and a parallel connection of the negative line and the modulation pole.
In one embodiment, the first controllable switch S11 and the third controllable switch S21 are closed, the second controllable switch S12 and the fourth controllable switch S22 are open, and the system is in a modulated pole line and positive pole line parallel operation mode.
The modulated pole line is connected in parallel with the positive pole line, and the sum of the currents flowing through the positive pole line and the modulated pole line is equal to the current flowing through the negative pole line, wherein the negative pole line is equivalent to the maximum current flowing through the negative pole line.
In one embodiment, the second controllable switch and the fourth controllable switch are closed, the first controllable switch and the third controllable switch are opened, and the system is in a working mode that the modulation pole line is connected with the negative pole line in parallel.
The modulated pole line is connected with the negative pole line in parallel, the sum of the currents flowing through the negative pole line and the modulated pole line is equal to the current flowing through the positive pole line, and the positive pole line is equivalent to the maximum current flowing at the moment.
The working modes shown in the above two embodiments are mutually switched at a very low frequency to complete the low-voltage direct-current power distribution process, in the working process of the whole system, the polarity of the current flowing through the positive and negative circuits is unchanged, the direct-current voltage of the positive and negative circuits is kept unchanged, and the continuous output of power can be realized in the whole process. The first controllable switch S11, the second controllable switch S12, the third controllable switch S21 and the fourth controllable switch S22 can be full-control type switch devices, on and off of the switches are achieved through an intelligent control algorithm, and compared with manual operation, the intelligent control switch is safer and more reliable.
In one embodiment, the rectifying unit 200 includes an AC/DC rectifier, the inverting unit 400 includes a DC/AC inverter, and the AC/DC rectifier and the DC/AC inverter employ a three-phase two-level full-bridge topology.
In an embodiment, the rectifying unit 200 includes an AC/DC rectifier, the inverting unit 400 includes a DC/AC inverter, and the AC/DC rectifier and the DC/AC inverter employ a three-phase three-level full-bridge topology.
Specifically, the AC/DC rectifier and the DC/AC inverter have the same topological structure, the switching devices have the same selection type, only the control implementation mode is different, the modular design can be realized, the maintenance and the assembly are convenient, the cost is reduced, and the topological structure of the AC/DC rectifier or the DC/AC inverter can adopt but not limited to a three-phase two-level full-bridge structure or a three-phase three-level full-bridge structure.
In one embodiment, a rectifier is further connected in series with the modulation pole line, and the rectifier is connected in series with the three-phase alternating current source to form a controllable voltage source which is used for controlling the power flow direction of the modulation pole line.
In one embodiment, a controllable voltage source is constructed by connecting a single-phase alternating current source to a single-phase double full-bridge rectifier converter connected in series with a modulation pole, and the controllable voltage source is used for controlling the power flow direction of a modulation pole line.
The rectifier connected with the modulation electrode in series is a three-phase double full-bridge rectifier converter, the three-phase double full-bridge rectifier converter is connected with two single full-bridge rectifiers, and the output voltage and the output current of the three-phase double full-bridge rectifier converter determine forward output or reverse output according to the current polarity change of the modulation electrode circuit.
In order to realize the equal effective value of the current flowing through the positive and negative electrode lines, the current on the modulation electrode line changes when the polarity is switched to be different, and in order to control the power flow direction on the modulation electrode line, the control is realized by controlling the voltage polarity of a controllable voltage source connected in series on the modulation electrode line. The polarity of the controllable voltage source can change in different stages, so that the amplitude and the polarity of the voltage can be controlled by selectively adopting the controllable converter to rectify the output.
Referring to fig. 2, the controllable voltage source is implemented by connecting a three-phase ac source to a three-phase double full-bridge rectifier converter, the three-phase double full-bridge rectifier converter is implemented by connecting two identical single full-bridge rectifiers back to back, and the output voltage and current can be output in forward and reverse directions, so that the requirement of current polarity change of a modulation electrode circuit can be met. It should be noted that: the modulation pole only needs to provide a controllable voltage source, one scheme is that an input three-phase power source (the three phases can be a three-phase voltage source of an alternating current power distribution system, and can also be a three-phase voltage source with adjustable output amplitude of a programmable source) is output through three-phase rectification, and the other scheme can directly adopt a single-phase alternating current source and a single-phase double full-bridge rectification output).
In a specific embodiment, a process simulating current commutation on three distribution lines is set up, the voltages on the positive electrode and the negative electrode are basically kept unchanged, namely kept at +/-350V, and only small fluctuation exists in the switching process. For the current waveform, the current of the positive electrode is reduced to +20A after the switching process from about +80A, and the current of the negative electrode is increased to-80A from-20A after the switching process, because the previous analysis has described that the current on the modulation electrode is the difference between the currents of the positive electrode and the negative electrode, the current of the modulation electrode is-60A in the stage 1 and becomes +60A after the switching process, and meanwhile, the polarity of the output voltage of the voltage source on the modulation electrode is changed along with the change of the current. The whole switching process maintaining time is about 0.4s, the switching period is determined according to the heating condition of the line and is generally 4-5 minutes, and therefore the switching process time is almost negligible.
The prior art adopts power frequency isolation transformer to realize the isolation of contravariant side and user side, firstly, when being applied to high power occasion, because there is power frequency isolation transformer, along with the increase of power grade, power frequency isolation transformer's volume and weight can double increase, the cost increases, secondly, when terminal low pressure user of circuit disperses, when needing to install many receiving end converters, need correspond many transformers of installation simultaneously, installation cost increases, the economic nature further reduces, this system can cause transmission power less at last, the power transmission ability of alternating current three-phase transmission line is not fully utilized.
Therefore, the invention fully utilizes the power transmission capability of the transmission line of the original alternating current distribution system, effectively improves the maximum power transmission capability of the improved direct current distribution system, fully considers the flexible direct current technology of power electronization, and has lower cost and large transmission power compared with the prior art. The three-pole low-voltage direct-current power distribution system adopts a three-pole direct-current power distribution system structure, a modulation pole circuit is added and is used for being alternately connected with a positive pole and a negative pole in parallel, three phase lines of an original alternating-current power transmission line are fully utilized, the maximum power transmission capacity of the direct-current power distribution system is effectively improved, and multi-terminal direct-current expansion is convenient to realize.
Further specifically, the transmitting-end converter and the receiving-end converter of the invention adopt the same topological structure, and can realize modular design.
Further specifically, the four controllable switches and the controllable voltage source are used for realizing the switching of the parallel mode of the modulation electrode circuit and the positive and negative electrode circuits and realizing the continuous output of power in the working process of the whole system.
More specifically, the modulation electrode circuit changes the current polarity in a mode of connecting a controllable voltage source in series, and the parallel mode switching of the modulation electrode circuit and the positive and negative electrode circuits is realized.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A three pole low voltage dc power distribution system, comprising: the power supply comprises an alternating current power supply unit, a rectifying unit for converting electric energy into direct current voltage, a direct current power transmission unit and an inversion unit;
the alternating current power supply unit is connected with the rectifying unit, the output side of the rectifying unit is connected with the direct current power transmission unit, and the direct current power transmission unit is connected with the input side of the inverting unit;
the power transmission line of the direct current power transmission unit is a three-phase line, and the three-phase line corresponds to the positive line, the negative line and the modulation electrode line respectively;
the direct current transmission unit comprises a controllable switch, and the controllable switch is used for controlling the modulation pole line to be alternately connected with the positive pole line and the negative pole line in parallel.
2. The three-pole low voltage dc power distribution system according to claim 1, wherein the controllable switches comprise a first controllable switch and a second controllable switch on an output side of the rectifying unit, and a third controllable switch and a fourth controllable switch on an input side of the inverting unit.
3. A three pole low voltage dc distribution system according to claim 2 wherein the first and third controllable switches are closed and the second and fourth controllable switches are open, the system being in a mode in which the modulated pole line is connected in parallel with the positive pole line.
4. The three-pole low voltage dc power distribution system according to claim 2, wherein the second controllable switch and the fourth controllable switch are closed, the first controllable switch and the third controllable switch are open, and the system is in an operation mode in which the modulated pole line is connected in parallel with the negative pole line.
5. The system of claim 1, wherein the rectifying unit comprises an AC/DC rectifier, the inverting unit comprises a DC/AC inverter, and the AC/DC rectifier and the DC/AC inverter employ a three-phase two-level full-bridge topology.
6. The system of claim 1, wherein the rectifying unit comprises an AC/DC rectifier, the inverting unit comprises a DC/AC inverter, and the AC/DC rectifier and the DC/AC inverter employ a three-phase three-level full-bridge topology.
7. The system of claim 1, wherein a rectifier is further connected in series with the modulated pole line, the rectifier being connected in series with a three-phase ac source to form a controllable voltage source for controlling a power flow direction of the modulated pole line.
8. The three-pole low-voltage dc power distribution system according to claim 7, wherein the rectifier connected in series with the modulation pole is a three-phase dual full-bridge rectifier converter, the three-phase dual full-bridge rectifier converter is connected by two single full-bridge rectifiers, and the output voltage and the output current of the three-phase dual full-bridge rectifier converter determine the forward output or the reverse output according to the current polarity change of the modulation pole line.
9. The system of claim 1 wherein the controllable voltage source is constructed by connecting a single-phase dual full-bridge rectifier converter in series with the modulator poles using a single-phase ac source to control the power flow direction of the modulator pole lines.
10. The three-pole low-voltage dc distribution system according to claim 1, further comprising an equivalent load connected to an output side of the inverter unit.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114362233A (en) * | 2021-12-30 | 2022-04-15 | 广东电网有限责任公司 | Three-pole low-voltage direct-current power distribution system and control method thereof |
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| US20170117817A1 (en) * | 2015-10-22 | 2017-04-27 | Qatar Foundation For Education, Science And Community Development | Method of converting high voltage ac lines into bipolar high voltage dc systems |
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| CN103595064A (en) * | 2013-10-23 | 2014-02-19 | 浙江大学 | Expansion double-electrode direct current transmission system |
| US20170117817A1 (en) * | 2015-10-22 | 2017-04-27 | Qatar Foundation For Education, Science And Community Development | Method of converting high voltage ac lines into bipolar high voltage dc systems |
| CN106452136A (en) * | 2016-06-20 | 2017-02-22 | 清华大学 | Multi-port power electronic converter for energy internet |
| CN111983501A (en) * | 2020-08-26 | 2020-11-24 | 广东电网有限责任公司电力科学研究院 | Modular energy feedback type AC/DC virtual load |
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| CN114362233A (en) * | 2021-12-30 | 2022-04-15 | 广东电网有限责任公司 | Three-pole low-voltage direct-current power distribution system and control method thereof |
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