CN101588073A - Balancing power distribution system of 10kV and below power distribution network - Google Patents

Balancing power distribution system of 10kV and below power distribution network Download PDF

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Publication number
CN101588073A
CN101588073A CNA2009100874565A CN200910087456A CN101588073A CN 101588073 A CN101588073 A CN 101588073A CN A2009100874565 A CNA2009100874565 A CN A2009100874565A CN 200910087456 A CN200910087456 A CN 200910087456A CN 101588073 A CN101588073 A CN 101588073A
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China
Prior art keywords
power distribution
phase
network
compensating device
power
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CNA2009100874565A
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Chinese (zh)
Inventor
郑琼林
杨晓峰
林飞
黄先进
孙湖
贺明智
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Beijing Jiaotong University
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Beijing Jiaotong University
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Priority to CNA2009100874565A priority Critical patent/CN101588073A/en
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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
    • 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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Abstract

The invention discloses a balancing power distribution system for 0kV and below power distribution network, belonging to the electrical distribution technology field. A first, second and third AC output ends (U) (V) (W) of a synthetic compensating gear (101) are respectively connected in parallel with a first, second and third feeder lines (111) (112) (113) of a switch-in electric network, the synthetic compensating gear is controlled as a current source and output the current signal, the current signal is superposed to the load current of a three-phase non-linearity asymmetric load, a three-phase symmetrical electric network current is obtained at the three-phase power distribution network side. A first, second and third public joint points of the synthetic compensating gear is located at the high-voltage side of a step-down distributing transformator or at the low-voltage side of the step-down distributing transformator. The balancing power distribution system can meet various electrical distribution requirements of a low-voltage power consumer, and realize the quick balancing of the power distribution network three-phase power, at the same time, the balancing power distribution system can compensate the electric network reactive power, restrain the system harmonic and effectively improve the utilization ratio of the distributing transformator.

Description

The balance distribution system of 10kV and following power distribution network
Technical field
The present invention relates to a kind of mesolow power transmission and distribution scheme, the balance distribution system of particularly a kind of 10kV and following power distribution network belongs to the distribution technique field.
Background technology
Along with industrial expansion, comprise that all kinds of power consumption equipments of power electronic equipment constantly increase, be to have introduced more interference source on the one hand, on the other hand, more power consumption equipment but needs high-quality electric energy, has therefore caused the contradiction on the supply-demand relationship.In, in the low-voltage network, the nonlinear-load of three-phase line has very big randomness, nor may be complete equipilibrium.The unbalanced operation meeting of distribution transformer brings transformer running wastage and three-phase distribution voltage deviation, and in this running status, has produced negative sequence component, and negative sequence component will cause the additional heating of electric rotating machine, increases system loss, reduces running efficiency of system.Town and country 10kV and following power distribution network three phase power be asymmetric appoints from three phase network during mainly owing to most of power consumer electricity consumption and gets one and cause mutually, the main method that solves is the distribution situation of electric power operation department according to each phase load at present, adjust certain electricity consumption of large electricity consumer, make this regional distribution network threephase load be tending towards in a basic balance with electric unit.But this method wastes time and energy, and only can make power distribution network be tending towards three-phase equilibrium, influences normal production.
Summary of the invention
Technical problem to be solved by this invention is: the balance distribution system that a kind of 10kV and following power distribution network are provided, can satisfy the various distribution demands of mesolow power consumer, and realize quick balance power distribution network three phase power, while compensation network reactive power, inhibition system harmonics, effectively improve the utilance of distribution transformer, reduce power distribution network line loss; The comprehensive compensating device of balance distribution system can be realized direct hanging net operation simultaneously.
Technical scheme of the present invention is as follows:
The balance distribution system of 10kV and following power distribution network, it is characterized in that: first ac output end of the ac output end of comprehensive compensating device connects first feeder line of electrical network, contact is first points of common connection, second ac output end of comprehensive compensating device connects second feeder line of electrical network, contact is second points of common connection, the 3rd ac output end of comprehensive compensating device connects the 3rd feeder line of electrical network, and contact is the 3rd points of common connection.Comprehensive compensating device is controlled as current source, and output current signal on the load current of the non-linear asymmetric load of three-phase that is added to, thereby obtains three symmetrical power network currents in three-phase distribution net side.
First, second, third points of common connection of comprehensive compensating device can be positioned at the high-pressure side of step-down distribution transformer, also can be positioned at the low-pressure side of step-down distribution transformer.
Described comprehensive compensating device adopts a kind of in the cascade multilevel converter, three-phase voltage code converter of three-phase module combined multi-level converter, three-phase delta connection.
The balance distribution system of 10kV and following power distribution network according to actual needs, also comprises the passive filtering unit, the detection control unit that are used with comprehensive compensating device except part recited above.
Beneficial effect of the present invention: 10kV that the present invention proposes and the balance distribution of following power distribution network system, can satisfy the various distribution demands of mesolow power consumer, and realize quick balance power distribution network three phase power, while compensation network reactive power, inhibition system harmonics, effectively improve the utilance of distribution transformer, reduce power distribution network line loss.The low voltage power devices of utilizing the comprehensive compensating device that the present invention addresses realizes high-power input, output, has that floor space is little, the devices switch frequency is low, is easy to advantage such as modularization.
Description of drawings
Fig. 1 is the balance distribution system structural representation of 10kV of the present invention and following power distribution network.
Fig. 2 is the structural representation of the specific embodiment of the invention one.
Fig. 3 is the structural representation of the specific embodiment of the invention two.
The three-phase module combined multi-level converter structural representation of Fig. 4 for proposing in the patent application 200910083927.5.
Embodiment
In conjunction with the accompanying drawings embodiments of the present invention are described further:
Fig. 1 is the balance distribution system structural representation of 10kV of the present invention and following power distribution network.The first ac output end U of comprehensive compensating device 101 connects first feeder line 111 of electrical network, contact is the first points of common connection PCC1, the second ac output end V of comprehensive compensating device 101 connects second feeder line 112 of electrical network, contact is the second points of common connection PCC2, the 3rd ac output end W of comprehensive compensating device 101 connects the 3rd feeder line 113 of electrical network, and contact is the 3rd points of common connection PCC3.
Comprehensive compensating device 101 is controlled as current source, and output current signal on the load current of the non-linear asymmetric load 109 of the three-phase that is added to, thereby obtains three symmetrical power network currents in three-phase distribution net 107 sides.
Fig. 2 is the structural representation of the specific embodiment of the invention one.The first ac output end U of comprehensive compensating device 101 connects first feeder line 111 of the high-pressure side 220 of step-down distribution transformer 108, tie point is the first points of common connection PCC1, the second ac output end V of comprehensive compensating device 101 connects second feeder line 112 of the high-pressure side 220 of step-down distribution transformer 108, tie point is the second points of common connection PCC2, the 3rd ac output end W of comprehensive compensating device 101 connects the 3rd feeder line 113 of the high-pressure side 220 of step-down distribution transformer 108, and tie point is the 3rd points of common connection PCC3.
Three outputs of parasitic element 120 are connected with the first ac output end U, the second ac output end V, the 3rd ac output end W of comprehensive compensating device 101 respectively, near the harmonic wave in the offset current that energy filtering comprehensive compensating device 101 produces the switching frequency.
Reference numeral among Fig. 2: 107---three-phase distribution net; 109---the non-linear asymmetric load of three-phase.
Fig. 3 is the structural representation of the specific embodiment of the invention two.The first ac output end U of comprehensive compensating device 101 connects first feeder line 116 of the low-pressure side 230 of step-down distribution transformer 108, tie point is the first points of common connection PCC1, the second ac output end V of comprehensive compensating device 101 connects second feeder line 117 of the low-pressure side 230 of step-down distribution transformer 108, tie point is the second points of common connection PCC2, the 3rd ac output end W of comprehensive compensating device 101 connects the 3rd feeder line 118 of the low-pressure side 230 of step-down distribution transformer 108, and tie point is the 3rd points of common connection PCC3.
Three outputs of parasitic element 120 are connected with the first ac output end U, the second ac output end V, the 3rd ac output end W of comprehensive compensating device 101 respectively, near the harmonic wave in the offset current that energy filtering comprehensive compensating device 101 produces the switching frequency.
Reference numeral among Fig. 3: 107---three-phase distribution net; 109---the non-linear asymmetric load of three-phase.
Comprehensive compensating device 101 adopts the three-phase module combined multi-level converter that proposes in the patent application 200910083927.5, perhaps adopt the three-phase module combined multi-level converter that is proposed in the document " Dorn Joerg; Huang Hartmut; Retzmann Dietmar.Novel Voltage-Sourced Converters for HVDC and FACTS Applications ", perhaps adopt the cascade multilevel converter of three-phase triangle (Delta) wiring that proposes in the United States Patent (USP) " US RE37,126 Multilevelcascade voltage source inverter with seperate DC sources ".The AC reactor of comprehensive compensating device 101 is installed in the brachium pontis, need not Industrial Frequency Transformer and adds reactor, directly hanging net operation.
The three-phase module combined multi-level converter structural representation of Fig. 4 for proposing in the patent application 200910083927.5.The first power cell U 1First AC terminal 11 n the 3rd power cell U that connects successively 3Constitute A and go up brachium pontis mutually, the second power cell U 2First AC terminal 21 n the 4th power cell U that connects successively 4Constitute A and descend brachium pontis mutually, A goes up brachium pontis mutually and A descends to pass through first reactor 1 between the brachium pontis to be connected with second reactor 2 mutually, and the tie point between described first reactor 1 and second reactor 2 is the ac output end U of A phase brachium pontis; The first power cell U 1Second AC terminal 12 n the 3rd power cell U that connects successively 3Constitute B and go up brachium pontis mutually, the second power cell U 2Second AC terminal 22 n the 4th power cell U that connects successively 4Constitute B and descend brachium pontis mutually, B goes up brachium pontis mutually and B descends to pass through the 3rd reactor 3 between the brachium pontis to be connected with the 4th reactor 4 mutually, and the tie point between described the 3rd reactor 3 and the 4th reactor 4 is the ac output end V of B phase brachium pontis; The first power cell U 1The 3rd AC terminal 13 n the 3rd power cell U that connects successively 3Constitute C and go up brachium pontis mutually, the second power cell U 2The 3rd AC terminal 23 n the 4th power cell U that connects successively 4Constitute C and descend brachium pontis mutually, C goes up brachium pontis mutually and C descends to pass through the 5th reactor 5 between the brachium pontis to be connected with the 6th reactor 6 mutually, and the tie point between described the 5th reactor 5 and the 6th reactor 6 is the ac output end W of C phase brachium pontis.The 3rd power cell U 3With the 4th power cell U 4Can mutual alternative, n gets the positive integer more than or equal to 1.
The first power cell U 1, the second power cell U 2, the 3rd power cell U 3, the 4th power cell U 4Belong to existing topological structure,, all adopt full control power device not at the present invention's row.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims (3)

1.10kV and the balance distribution system of following power distribution network, it is characterized in that: first ac output end (U) of comprehensive compensating device (101) connects first feeder line (111) of electrical network, tie point is first points of common connection (PCC1), second ac output end (V) of comprehensive compensating device (101) connects second feeder line (112) of electrical network, tie point is second points of common connection (PCC2), the 3rd ac output end (W) of comprehensive compensating device (101) connects the 3rd feeder line (113) of electrical network, and tie point is the 3rd points of common connection (PCC3);
Comprehensive compensating device (101) is controlled as current source, and output current signal on the load current of the non-linear asymmetric load of the three-phase that is added to (109), thereby obtains three symmetrical power network currents in three-phase distribution net (107) side.
2. the balance distribution system of 10kV according to claim 1 and following power distribution network, it is characterized in that: first points of common connection (PCC1) of comprehensive compensating device (101), second points of common connection (PCC2), the 3rd points of common connection (PCC3) are positioned at the high-pressure side (220) of step-down distribution transformer (108), or are positioned at the low-pressure side (230) of step-down distribution transformer (108).
3. the balance distribution system of 10kV according to claim 1 and following power distribution network is characterized in that: the comprehensive compensating device of addressing (101) adopts a kind of in the cascade multilevel converter of three-phase module combined multi-level converter, three-phase delta connection.
CNA2009100874565A 2009-06-22 2009-06-22 Balancing power distribution system of 10kV and below power distribution network Pending CN101588073A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102723738A (en) * 2012-07-05 2012-10-10 北京交通大学 Modularized dynamic voltage regulating system based on cascade structure
CN103088220A (en) * 2013-01-30 2013-05-08 东南大学 Three-phase-equilibrium electroslag refining furnace
CN104065092A (en) * 2014-06-04 2014-09-24 毛四新 Intelligent balance compensation method and apparatus
CN107437825A (en) * 2016-05-27 2017-12-05 恩斯迈电子(深圳)有限公司 Current regulation system
US9876358B2 (en) 2013-06-07 2018-01-23 Abb Schweiz Ag Converter arrangement for power compensation and a method for controlling a power converter
CN109028944A (en) * 2018-07-28 2018-12-18 中原工学院 A kind of grinding wheel firing tunnel oven low-voltage three phase symmetry load temperature control system

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102723738A (en) * 2012-07-05 2012-10-10 北京交通大学 Modularized dynamic voltage regulating system based on cascade structure
CN102723738B (en) * 2012-07-05 2014-12-03 北京交通大学 Modularized dynamic voltage regulating system based on cascade structure
CN103088220A (en) * 2013-01-30 2013-05-08 东南大学 Three-phase-equilibrium electroslag refining furnace
US9876358B2 (en) 2013-06-07 2018-01-23 Abb Schweiz Ag Converter arrangement for power compensation and a method for controlling a power converter
CN104065092A (en) * 2014-06-04 2014-09-24 毛四新 Intelligent balance compensation method and apparatus
CN107437825A (en) * 2016-05-27 2017-12-05 恩斯迈电子(深圳)有限公司 Current regulation system
CN107437825B (en) * 2016-05-27 2021-11-02 恩斯迈电子(深圳)有限公司 Current regulation system
CN109028944A (en) * 2018-07-28 2018-12-18 中原工学院 A kind of grinding wheel firing tunnel oven low-voltage three phase symmetry load temperature control system

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Open date: 20091125