CN108879679B - Multi-target electric energy quality comprehensive treatment device for medium-voltage power distribution network - Google Patents
Multi-target electric energy quality comprehensive treatment device for medium-voltage power distribution network Download PDFInfo
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- 230000002457 bidirectional effect Effects 0.000 claims abstract description 34
- 238000004146 energy storage Methods 0.000 claims abstract description 32
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 238000004804 winding Methods 0.000 claims description 12
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 229910052744 lithium Inorganic materials 0.000 claims description 3
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- 206010003591 Ataxia Diseases 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
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Abstract
The invention discloses a multi-target electric energy quality comprehensive treatment device for a medium-voltage distribution network, which comprises three-phase parallel transformers, three single-phase series transformers respectively corresponding to each phase of ABC three phases and three single-phase energy storage type conversion units, wherein each single-phase energy storage type conversion unit comprises 2n first units and n second units, each first unit comprises a single-phase full-bridge AC-DC converter, a power supply side bidirectional DC-DC converter, an energy storage device and a load side bidirectional DC-DC converter which are sequentially connected, and each second unit comprises a three-phase six-bridge arm DC-AC converter. The invention is mainly used for medium-voltage distribution networks with medium-level (10 kV or 35 kV) voltage levels, can inhibit harmonic current at the load side, balance three-phase current of a distribution transformer, improve the utilization rate of the transformer, dynamically compensate reactive power of the load, improve the power factor of the distribution network, quickly compensate active power of the load, improve the stability and reliability of power supply voltage of users and the like.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a multi-target power quality comprehensive treatment device for a medium-voltage distribution network.
Background
Electric energy is used as a secondary energy source which is economical, practical, convenient to clean and easy to control and convert, and becomes an important foundation for economic development and people's life. With the wide application of power electronic equipment, various nonlinear, impact, fluctuating and asymmetric loads are greatly increased, and the problems of three-phase voltage unbalance, voltage sag, harmonic waves, low power factor, high negative sequence current content and other electric energy quality are caused. Meanwhile, the distribution network voltage is difficult to adjust due to the large load change range of the distribution network, and the phenomenon that the power supply voltage is higher or lower and even exceeds the voltage limit occurs. Therefore, how to effectively improve the quality of electric energy is a common concern for power supply departments, power consumers, and power equipment manufacturers.
Therefore, various current quality control devices are installed at the user side at present, so that pollution of harmonic current, negative sequence current and the like of the user to a power grid is inhibited; meanwhile, various voltage quality control devices are installed between a power supply system and a user to provide high-quality power supply voltage for electric equipment. However, when there are multiple power quality problems in a power supply area, multiple different target management devices are needed to be used in cooperation, and due to the lack of coordination among multiple devices, repeated compensation or mutual influence on some power quality problems may be caused, so that the management of the power quality cannot achieve an ideal effect. In addition, there may be repeated installation of power quality management devices of similar function, resulting in waste of management capital.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the problems in the prior art, the multi-target, synchronous and integrated power quality treatment device is provided, and various power quality problems existing at the power supply side and the user side at the same time are comprehensively treated, so that the power supply quality of sensitive loads is improved, and the power pollution of the sensitive loads to a power distribution network is inhibited.
In order to solve the technical problems, the invention adopts the technical scheme that:
the invention provides a multi-target electric energy quality comprehensive treatment device for a medium-voltage distribution network, which comprises a three-phase parallel transformer, three single-phase series transformers respectively corresponding to each phase of ABC three phases and three single-phase energy storage type conversion units, wherein each single-phase energy storage type conversion unit comprises 2n first units and n second units, each first unit comprises a single-phase full-bridge AC-DC converter, a power supply side bidirectional DC-DC converter, an energy storage device and a load side bidirectional DC-DC converter which are sequentially connected, each second unit comprises a three-phase six-bridge arm DC-AC converter, alternating current ports of all the 2n single-phase full-bridge AC-DC converters of the first units are sequentially connected in a cascade manner to form a chain structure and are respectively connected with low-voltage windings of the three-phase parallel transformer through alternating current ports at a chain head and a chain tail, the high-voltage winding of the three-phase parallel type transformer is connected with the medium-voltage distribution network, the direct-current port of the single-phase full-bridge AC-DC converter in each first unit is connected with one end of the energy storage device and the power supply side bidirectional DC-DC converter in sequence, the other end of the energy storage device is connected with a low-voltage port of a load-side bidirectional DC-DC converter, high-voltage ports of the load-side bidirectional DC-DC converters of 2n first units are connected in parallel two by two and then respectively connected with direct-current ports of three-phase six-bridge-arm DC-AC converters of n second units one by one, each phase of an alternating-current port of the three-phase six-bridge-arm DC-AC converters of the n second units is respectively connected with an outlet terminal of a single-phase series transformer, and the other outlet terminals of the three single-phase series transformers are mutually connected in parallel and grounded, and the high-voltage windings of the three single-phase series transformers are respectively connected in series in the corresponding phases of the medium-voltage distribution network.
Preferably, the second unit further includes a three-phase filter inductor, the three-phase filter inductor is connected in series to an AC port of the three-phase six-leg DC-AC converter, and the three-phase filter inductor includes a filter inductor connected in series to each phase of the AC port of the three-phase six-leg DC-AC converter.
Preferably, the ac port of the chain head in the chain structure and each phase line of the low-voltage winding of the three-phase parallel transformer are connected in series with a single-phase filter inductor.
Preferably, the energy storage device is a super capacitor, or a lithium battery, or a storage battery.
Preferably, the single-phase full-bridge AC-DC converter, the power supply side bidirectional DC-DC converter, the load side bidirectional DC-DC converter and the three-phase six-leg DC-AC converter are all converters based on fully-controlled switch devices.
Preferably, the fully-controlled switch device is one of an insulated gate bipolar power transistor IGBT, an electron injection enhanced gate transistor IEGT, an integrated gate commutated thyristor IGCT, and a turn-off thyristor GTO.
The multi-target electric energy quality comprehensive treatment device for the medium-voltage distribution network has the following advantages: the invention comprises a three-phase parallel type transformer, three single-phase series type transformers respectively corresponding to each phase of ABC three phases and three single-phase energy storage type conversion units, wherein each single-phase energy storage type conversion unit comprises 2n first units and n second units, each first unit comprises a single-phase full-bridge AC-DC converter, a power supply side bidirectional DC-DC converter, an energy storage device and a load side bidirectional DC-DC converter which are sequentially connected, each second unit comprises a three-phase six-bridge-arm DC-AC converter, by controlling the working state of each single-phase full-bridge AC-DC converter and the working state of the power supply side bidirectional DC-DC converter, on one hand, harmonic current generated by a load side and three-phase current imbalance of the load side can be treated, on the other hand, reactive power can be rapidly and dynamically compensated, and stable operation of voltage on a power grid side is ensured; by controlling the working states of all three-phase six-bridge-arm DC-AC converters and the working states of the load-side bidirectional DC-DC converters and combining the energy storage device, voltage sag, voltage harmonics and three-phase voltage imbalance of the power supply side can be controlled, and the voltage stability and reliability of the user side are improved.
Drawings
Fig. 1 is a schematic circuit diagram according to an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of a single-phase energy storage type conversion unit according to an embodiment of the present invention.
Illustration of the drawings: 1. a single-phase energy storage type conversion unit; 11. a single-phase full-bridge AC-DC converter; 111. a single-phase filter inductor; 12. a power supply side bidirectional DC-DC converter; 13. an energy storage device; 14. a load-side bidirectional DC-DC converter; 15. a three-phase six-leg DC-AC converter; 16. a three-phase filter inductor; 2. a three-phase parallel type transformer; 3. a single-phase series transformer.
Detailed Description
As shown in fig. 1 and 2, the present embodiment provides a multi-target power quality comprehensive treatment device for a medium voltage distribution network, including a three-phase parallel transformer 2, three single-phase series transformers 3 and three single-phase energy storage type conversion units 1 (see fig. 1, 1#1 to 1# 3) corresponding to each of three phases ABC, where each single-phase energy storage type conversion unit 1 includes 2n first units and n second units, each first unit includes a single-phase full-bridge AC-DC converter 11, a power supply side bidirectional DC-DC converter 12, an energy storage device 13, and a load side bidirectional DC-DC converter 14, each second unit includes a three-phase six-bridge arm DC-AC converter 15, alternating current ports of the single-phase full-bridge AC-DC converters 11 of all the 2n first units are sequentially connected in a cascade connection manner to form a chain structure, And are connected with the low-voltage winding of the three-phase parallel type transformer 2 through the alternating current ports of the chain head and the chain tail respectively, the high-voltage winding of the three-phase parallel type transformer 2 is connected with the medium-voltage distribution network, the direct-current port of the single-phase full-bridge AC-DC converter 11 in each first unit is connected with one end of the power supply side bidirectional DC-DC converter 12 and one end of the energy storage device 13 sequentially, the other end of the energy storage device 13 is connected with the low-voltage port of the load side bidirectional DC-DC converter 14, the high-voltage ports of the load side bidirectional DC-DC converters 14 of 2n first units are connected in parallel in pairs and then are respectively connected with the direct-current ports of the three-phase six-bridge arm DC-AC converters 15 of n second units one by one, each phase of the alternating-current ports of the three-phase six-bridge arm DC-AC converters 15 of n second units is, and the other outlet terminals of the three single-phase series transformers 3 are grounded in parallel, and the high-voltage windings of the three single-phase series transformers 3 are respectively connected in series in the corresponding phases of the medium-voltage distribution network. It should be noted that, as shown in fig. 1, the number of the 2n first units and the number of the n second units included in the single-phase energy storage type conversion unit 1 are exemplarily illustrated as a plurality (n ≧ 3), and needless to say, the number of the first units and the number of the n second units may be one or two according to needs, and the principle is the same as that of the present embodiment, so the number n thereof may be extended to be n ≧ 1.
As shown in fig. 1 and 2, the second unit further includes a three-phase filter inductor 16, the three-phase filter inductor 16 is connected in series to the AC port of the three-phase six-leg DC-AC converter 15, and the three-phase filter inductor 16 includes a filter inductor connected in series to each phase of the AC port of the three-phase six-leg DC-AC converter 15.
As shown in fig. 1 and fig. 2, a single-phase filter inductor 111 is connected in series to each phase line of the low-voltage winding of the three-phase parallel transformer 2 and the ac port of the chain head in the chain structure.
Referring to fig. 2, a chain structure formed by cascading all the single-phase full-bridge AC-DC converters 11 of the 2n first units is connected to the low-voltage winding of the three-phase parallel transformer 2 through the AC ports a and b at the head and tail of the chain, respectively. Taking the single-phase full-bridge AC-DC converter 11 at the head of the chain as an example, the positive electrode of the DC port of the single-phase full-bridge AC-DC converter 11c1 and high voltage port of single phase full bridge AC-DC converter 12d1-phase connected, low-voltage port of single-phase full-bridge AC-DC converter 12e1 and one end of an energy storage device 13f1 connected to one end of an energy storage device 13gLow voltage port of 1-time and load-side bidirectional DC-DC converter 14h1 are connected. Furthermore, the high-voltage port of the load-side bidirectional DC-DC converter 14 in the first-chain single-phase full-bridge AC-DC converter 11i1 and a high-voltage port of a load-side bidirectional DC-DC converter 14 in a second single-phase full-bridge AC-DC converter 11i2 are connected in parallel with each other and then respectively connected with the direct current ports of the three-phase six-bridge arm DC-AC converter 15 of the first one of the n second unitsj1-phase three-phase six-bridge arm DC-AC converter 15 alternating current portk1, and one terminal of a three-phase filter inductor 16l1-phase connected, three-phase filter inductor 16o1, the three-phase single-phase series-connection type transformer 3 is connected with one outlet terminal of the A-phase single-phase series-connection type transformer 3, the other outlet terminals of the A \ B \ C three-phase single-phase series-connection type transformer 3 are connected in parallel with each other and grounded, and high-voltage windings of the A \ B \ C three-phase single-phase series-connection type transformer 3 are respectively connected in series in corresponding phases of the medium-voltage distribution network.
In this embodiment, the energy storage device 13 may adopt a super capacitor, a lithium battery, or a storage battery as needed.
In this embodiment, the single-phase full-bridge AC-DC converter 11, the power supply side bidirectional DC-DC converter 12, the load side bidirectional DC-DC converter 14, and the three-phase six-leg DC-AC converter 15 are all converters based on fully-controlled switching devices.
In this embodiment, the fully-controlled switch device is one of an insulated gate bipolar power transistor IGBT, an electron injection enhanced gate transistor IEGT, an integrated gate commutated thyristor IGCT, and a turn-off thyristor GTO.
The multi-target electric energy quality comprehensive treatment device for the medium-voltage distribution network is mainly used for medium-level (10 kV or 35 kV) voltage levels, and the working principle of the multi-target electric energy quality comprehensive treatment device for the medium-voltage distribution network is as follows: on one hand, by controlling the working state of each single-phase full-bridge AC-DC converter 11 and the working state of the power supply side bidirectional DC-DC converter 12, on the one hand, harmonic current generated by a load side and three-phase current imbalance of the load side can be treated, on the other hand, reactive power can be rapidly and dynamically compensated, and stable operation of voltage on a power grid side is ensured; on the other hand, by controlling the working states of all three-phase six-bridge arm DC-AC converters 15 and the working states of the load side bidirectional DC-DC converter 14 and combining the energy storage device 13, voltage sag, voltage harmonics and three-phase voltage unbalance of a power supply side can be treated, the voltage stability and reliability of a user side are improved, and the purpose of multi-target electric energy quality comprehensive treatment of the medium-voltage distribution network can be achieved.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (6)
1. The device is characterized by comprising a three-phase parallel transformer (2), three single-phase series transformers (3) corresponding to each phase of ABC three phases respectively and three single-phase energy storage type conversion units (1), wherein each single-phase energy storage type conversion unit (1) comprises 2n first units and n second units, each first unit comprises a single-phase full-bridge AC-DC converter (11), a power supply side bidirectional DC-DC converter (12), an energy storage device (13) and a load side bidirectional DC-DC converter (14) which are sequentially connected, each second unit comprises a three-phase six-bridge-arm DC-AC converter (15), and alternating current ports of the single-phase full-bridge AC-DC converters (11) of all the 2n first units are sequentially connected in a cascade mode to form a chain structure, The high-voltage terminals of the single-phase full-bridge AC-DC converters (11) in each first unit are sequentially connected with one end of an energy storage device (13) through a power supply side bidirectional DC-DC converter (12), the other end of the energy storage device (13) is connected with the low-voltage terminal of a load side bidirectional DC-DC converter (14), the high-voltage terminals of the load side bidirectional DC-DC converters (14) of 2n first units are connected in parallel with one another two by two and then respectively connected with the direct-current terminals of three-phase six-bridge-arm DC-AC converters (15) of n second units one by one, each phase of the alternating-current terminal of the three-phase six-bridge-arm DC-AC converters (15) of n second units is respectively connected with an outlet terminal of a single-phase series-type transformer (3), and the other outlet terminals of the three single-phase series transformers (3) are grounded in parallel, and high-voltage windings of the three single-phase series transformers (3) are respectively connected in series in corresponding phases of the medium-voltage distribution network.
2. The multi-target power quality comprehensive treatment device for the medium voltage distribution network according to claim 1, wherein the second unit further comprises a three-phase filter inductor (16), the three-phase filter inductor (16) is connected in series to an alternating current port of the three-phase six-leg DC-AC converter (15), and the three-phase filter inductor (16) comprises a filter inductor connected in series to each phase of the alternating current port of the three-phase six-leg DC-AC converter (15).
3. The multi-target power quality comprehensive treatment device for the medium-voltage distribution network according to claim 1, characterized in that: and the alternating current port of the chain head in the chain structure and each phase line of the low-voltage winding of the three-phase parallel transformer (2) are connected with a single-phase filter inductor (111) in series.
4. The multi-target power quality comprehensive treatment device for the medium-voltage distribution network according to claim 1, characterized in that: the energy storage device (13) is a super capacitor, or a lithium battery, or a storage battery.
5. The multi-target power quality comprehensive treatment device for the medium-voltage distribution network according to claim 1, characterized in that: the single-phase full-bridge AC-DC converter (11), the power supply side bidirectional DC-DC converter (12), the load side bidirectional DC-DC converter (14) and the three-phase six-bridge arm DC-AC converter (15) are all converters based on fully-controlled switch devices.
6. The multi-target power quality comprehensive treatment device for the medium-voltage distribution network according to claim 5, wherein: the full-control switch device is one of an insulated gate bipolar power tube IGBT, an electron injection enhanced gate transistor IEGT, an integrated gate commutated thyristor IGCT and a turn-off thyristor GTO.
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| CN113131429B (en) * | 2021-05-14 | 2022-12-06 | 南方电网科学研究院有限责任公司 | Controllable current source ice melting device |
| CN113890028B (en) * | 2021-10-20 | 2024-04-12 | 东南大学 | Novel load element model considering power electronic influence |
| CN115622068B (en) * | 2022-12-16 | 2024-04-05 | 普世通（北京）电气有限公司 | Power distribution network power supply voltage deviation and interruption treatment device and control method thereof |
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| CN102231522B (en) * | 2011-07-01 | 2013-11-06 | 中国科学院电工研究所 | Power flow controller with failure current limiting function |
| CN104701838A (en) * | 2013-12-06 | 2015-06-10 | 广西大学 | Unified power quality adjusting device based on battery energy storage |
| CN107248750A (en) * | 2017-06-12 | 2017-10-13 | 国家电网公司 | A kind of accumulation energy type power governor and distribution system for distribution system |
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