CN100372208C - Three-phase unified electric energy quality controller without isolation link - Google Patents

Three-phase unified electric energy quality controller without isolation link Download PDF

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Publication number
CN100372208C
CN100372208C CNB2006100118102A CN200610011810A CN100372208C CN 100372208 C CN100372208 C CN 100372208C CN B2006100118102 A CNB2006100118102 A CN B2006100118102A CN 200610011810 A CN200610011810 A CN 200610011810A CN 100372208 C CN100372208 C CN 100372208C
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China
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unit
series
voltage
parallel
phase
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CNB2006100118102A
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Chinese (zh)
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CN1848585A (en
Inventor
李国杰
张谢平
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清华大学
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30Reactive power compensation
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40Arrangements for reducing harmonics

Abstract

The present invention relates to a three-phase unified electric energy quality controller without an isolation link, which belongs to the technical field of electric power equipment. The present invention is characterized in that the present invention is formed by the method that three completely identical single-phase controllers are assembled. Each controller comprises a parallel unit comprising an inversion bridge composed of two switching tubes and a filter inductor, a series unit comprising an inversion bridge composed of two switching tubes and a wave filter composed of a capacitor and an inductor, and an energy storage unit composed of an upper set of direct current capacitors and a lower set of direct current capacitors, wherein leading-out wires between the two sets of capacitors serve as common connecting wires of the series unit, the parallel unit and an electric network. The present invention avoids the faults of through capacitor conduction, alternating current short circuit, etc. caused by the condition that the series unit and the parallel unit share the energy storage part, and therefore, an isolation measure does not need to be used. Each series unit is connected with a power supply in series, each parallel unit is connected into a triangle on a load side, and each energy storage unit is independent mutually. With an appropriate control strategy, the present invention can effectively solve various electric energy quality problems and also have the advantages of simple structure and lower cost.

Description

A kind of three-phase unified electric energy quality controller that does not have isolation link
Technical field
The present invention relates to a kind of three-phase unified electric energy quality controller that does not have isolation link, belong to electrical equipment technical field.
Background technology
Power quality problem can be divided into two big classes: the quality of voltage problem, and the quality of the reliability of confession under directions electricity and the amplitude of supply power voltage, waveform, frequency etc. are that electric load is paid close attention to; The electric current quality problems refer to idle, the humorous size that involves negative sequence component in the load current, are that electric power system is paid close attention to.This two classes problem can utilize corresponding power electronic equipment to solve, and can solve the quality of voltage problem as dynamic voltage compensator, and Active Power Filter-APF can solve the electric current quality problems.
Unified electric energy quality controller (UPQC) combines the function of dynamic voltage compensator and Active Power Filter-APF, can guarantee the quality of voltage of load side and the electric current quality of system side simultaneously.UPQC is made up of three elementary cells usually: series unit, unit in parallel and dc energy storage unit.Wherein series unit is made the usefulness of voltage compensation, to solve the quality of voltage problem, is equivalent to a dynamic voltage compensator; Unit in parallel solves the electric current quality problems as current compensation, is equivalent to an Active Power Filter-APF; Dc energy storage unit is made of direct current capacitor, and is shared by series connection and unit in parallel, provides galvanic current pressure to them.Because dc capacitor is shared by connection in series-parallel Unit two, in traditional UPQC topology, for preventing faults such as ac short circuit, dc capacitor lead directly to, must take certain electrical isolation between the alternating current-direct current, usually adopt the method that installs transformer in series connection and both sides in parallel respectively additional to realize isolation, as shown in Figure 1.The access of transformer not only provides the effective isolation effect, and the capacity of all right expansion instrument makes the selection of device more flexible.But the introducing of transformer also can bring simultaneously such as unfavorable factors such as cost, volume, loss, non-linear, surges.Therefore, the defective of introducing transformer under the enough situation of capacity lower in electric pressure or switching device will be far longer than the advantage of being brought.
Apply for and disclose " a kind of unified electric energy regulator that adopts dc energy storage to carry out electrical isolation " of the Tsing-Hua University of (publication number is CN 1571235A) in January, 2005 to China State Intellectual Property Office in April, 2004, the method that proposition is isolated in the direct current unit, though this method has been saved transformer, but used four switching tubes more on every phase dc bus, and increased the complexity of control.
Summary of the invention
The purpose of this invention is to provide a kind of three-phase unified electric energy quality controller that need not to take quarantine measures, be aided with suitable control strategy, this controller can be realized every voltage compensation and the electric current compensation function that traditional three-phase UPQC is had.
The invention is characterized in:
Described controller is combined by three identical single-phase controllers, and the series unit of each controller is directly gone here and there mutually with power supply, and triangular structure is formed in load side in unit in parallel, and described every phase controller comprises:
Unit in parallel, comprise an inverter bridge and a filter inductance " 10 " of forming by the switching tube of " 8 ", " 9 " two forward series connection, the described switching tube of one termination " 8 " of this filter inductance, the serial connection point of " 9 ", the input of another termination load line voltage, the pwm voltage ripple of described inverter bridge output are used for control flows and cross the electric current (i of filter inductance " 10 " Ck), enable to compensate idle, harmonic wave and the negative sequence component in the load current and keep the constant of DC bus-bar voltage, described k ∈ the input of load line voltage: a, b, c}, down with;
Series unit, comprise switching tube " 4 " by two forward series connection, the inverter bridge that " 5 " are formed, low pass filter and the bypass thyristor " 2 " formed by electric capacity " 1 " and inductance " 3 ", the described switching tube of one termination " 4 " of described filter inductance " 3 " and the serial connection point of switching tube " 5 ", the serial connection point of described filter capacitor " 1 " and filter inductance " 3 " connects power end, this power end connects an end of described bypass thyristor " 2 " simultaneously, the other end of bypass thyristor " 2 " is connected to the input of load line voltage with the other end of electric capacity " 1 ", described inverter bridge produces suitable pwm voltage ripple and comes falling of offset supply voltage, surge, harmonic wave and negative phase-sequence composition, described low pass filter is used for the switch harmonic component in the filtering pwm voltage ripple, described bypass thyristor is in supply voltage conducting just often, supply voltage directly offers load by it, turn-offs when the quality of voltage problem occurring;
Energy-storage units, be composed in series by two dc capacitors " 6 ", " 7 " forward, the serial connection point of described dc capacitor " 6 ", " 7 " is connected to the load side of described bypass thyristor " 2 ", the series capacitor that constitutes by " 6 " and " 7 " simultaneously and connect the two ends of series unit inverter bridge, unit in parallel inverter bridge, this energy-storage units provides galvanic current to press for described series unit and unit in parallel.
The three-phase unified electric energy quality controller of the no isolation link that the present invention proposes has following advantage:
1, compare with traditional UPQC, do not introduce transformer or other isolation links, many unfavorable factors of having avoided transformer to bring, and simple in structure, cost is lower;
2, storage capacitor is shared by the connection in series-parallel unit, has both guaranteed the energy Flow between Unit two, and faults such as electric capacity is straight-through, ac short circuit can not take place again simultaneously;
3, be aided with suitable control strategy, can realize every function of traditional three-phase UPQC, can effectively solve all kinds of voltage and current quality problems.
In a word, the three-phase unified electric energy quality controller that the present invention proposes had both saved isolation link, can realize every current compensation and the voltage compensating function of traditional three-phase UPQC again.
Description of drawings
Fig. 1 is the circuit diagram of traditional three-phase unified electric energy quality controller.
Fig. 2 is the circuit diagram of the novel three-phase unified electric energy quality controller that proposes of the present invention.
Fig. 3 (a) (b) (c) be respectively power line voltage and load line voltage during the electric voltage dropping takes place, the simulation waveform figure of power supply phase voltage, source current and load current under the source current during falling and load current and the normal condition.
Embodiment
The novel three-phase unified electric energy quality controller that the present invention proposes is combined by three identical single-phase controllers, and every phase controller comprises:
(1) is used to solve the current compensator of electric current quality problems, or is called unit in parallel, comprise an inverter bridge and a filter inductance of forming by two IGBT;
(2) be used to solve the voltage compensator of quality of voltage problem, or claim series unit, comprise an inverter and a low pass filter of forming by electric capacity and inductance of forming by two IGBT;
(3) provide the energy-storage units of stable DC voltage for two unit of connection in series-parallel, be made up of two direct current capacitors up and down, the point of contact of two dc capacitors of energy-storage units is drawn to be received on the electrical network, as the public point of contact of connection in series-parallel Unit two and electrical network.
Respectively be in series unit and load is in series, and the unit that respectively is in parallel is coupled to triangular structure in load side, and each phase energy-storage units is separate.
When the quality of voltage problem appears in mains side, still be the sinusoidal quantity three symmetrical, that amplitude is specified in order to guarantee load side voltage, at first need to calculate the reference value u of unit output voltage of whenever being in series Jrefk(k=a, b, c, down with), draw the output voltage u of the inverter bridge that whenever is in series then CkControl law, make the output voltage of series unit reality, the voltage u on promptly every phase filter capacitor " 1 " JkCan follow the tracks of its reference value u rapidly and accurately Jrefku CkControl law realize by the pwm voltage ripple.
When the electric current quality problems appear in load side, in order to guarantee that source current still is that the power that three symmetrical sinusoidal quantities and power supply send equates with the power of load absorption, need calculate suitable shunt compensation current value, the current value i on the unit filtering inductance " 10 " that promptly whenever is in parallel Ck, this current value can be realized by two switching tubes " 8 " of control parallel inverter bridge, the on off state of " 9 ".
Lift the validity that a simulation example is verified the three-phase unified electric energy quality controller that the present invention proposes below.Adopt PSCAD/EMTDC simulation software bag, the power line voltage rated value is 380V, and frequency is 50Hz, loads to non-linear and unbalanced.Supply voltage falls to having taken place between the 1.5s at 0.8s, the waveform of supply voltage, load voltage, source current and load current during accompanying drawing 3 has provided and fallen and under the normal condition.As seen the sine wave that load voltage is always three symmetrical, amplitude is specified, source current is the symmetrical sine amount substantially, illustrates that the electric energy quality controller that the present invention proposes can solve all kinds of power quality problems effectively.

Claims (2)

1. a three-phase unified electric energy quality controller that does not have isolation link is characterized in that,
Described controller is combined by three identical single-phase controllers, and the series unit of each controller is directly gone here and there mutually with power supply, and triangular structure is formed in load side in unit in parallel, and described single-phase controller comprises:
Unit in parallel, comprise an inverter bridge and a filter inductance of forming by the switching tube of two forward series connection, the serial connection point of described two switching tubes of one termination of this filter inductance, the input of another termination load line voltage, the pwm voltage ripple of described inverter bridge output is used for control flows and crosses the electric current of above-mentioned filter inductance, enables to compensate idle, harmonic wave and the negative sequence component in the load current and keeps the constant of DC bus-bar voltage;
Series unit, comprise the inverter bridge of forming by the switching tube of two other forward series connection, low pass filter and the bypass thyristor formed by filter capacitor and another filter inductance, serial connection point in the described series unit of one termination of this filter inductance between two switching tubes of inverter bridge, filter capacitor in the described series unit and the serial connection of filter inductance point connect power end, this power end connects an end of described bypass thyristor simultaneously, the other end of this bypass thyristor is connected to the input of load line voltage with the other end of above-mentioned filter capacitor, the inverter bridge of described series unit produces suitable pwm voltage ripple and comes falling of offset supply voltage, surge, harmonic wave and negative phase-sequence composition, low pass filter in the described series unit is used for the switch harmonic component in the filtering pwm voltage ripple, described bypass thyristor is in supply voltage conducting just often, supply voltage directly offers load by it, turn-offs when the quality of voltage problem occurring;
Energy-storage units, be composed in series by two dc capacitor forwards, the serial connection point of described two dc capacitors is connected to the load side of described bypass thyristor, described energy-storage units simultaneously and connect the two ends of series unit inverter bridge, unit in parallel inverter bridge, this energy-storage units provides the galvanic current to press for described series unit and unit in parallel.
2. three-phase unified electric energy quality controller as claimed in claim 1 is characterized in that, the switching tube of wherein forming unit in parallel and series unit is any in insulated gate bipolar transistor, gate level turn-off thyristor, the integral gate change transistor.
CNB2006100118102A 2006-04-28 2006-04-28 Three-phase unified electric energy quality controller without isolation link CN100372208C (en)

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Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101766244B1 (en) * 2010-07-06 2017-08-08 엘지전자 주식회사 Apparatus and method for controlling compressor and refrigerator including the same
KR101766243B1 (en) 2010-07-06 2017-08-08 엘지전자 주식회사 Apparatus and method for controlling compressor and refrigerator including the same
CN201781278U (en) * 2010-08-02 2011-03-30 郑军 Power distribution circuit and power distribution cabinet
CN102055189A (en) * 2010-09-13 2011-05-11 徐州宇飞电力科技有限公司 Control method for three-phase unified electric energy quality controller without isolating transformer
CN102064552B (en) * 2010-12-03 2013-01-16 哈尔滨工业大学深圳研究生院 Single-phase and three-phase electric energy quality controllers with novel structures
CN102170139B (en) * 2011-04-02 2013-01-09 西安工程大学 Topology of series connection type voltage transient variation compensation circuit and control method thereof
CN102437575B (en) * 2011-12-29 2015-04-29 中国科学院电工研究所 Medium-and-high-voltage unified power quality controller (UPQC) without transformer
CN102769389B (en) * 2012-07-24 2015-03-04 西安交通大学 Transformer-free series voltage quality regulator based on parasitic booster circuit and control method of regulator
CN107425733A (en) * 2017-07-28 2017-12-01 西安交通大学 A kind of low-voltage electric energy router topology and control method

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CN1560981A (en) * 2004-03-12 2005-01-05 清华大学 Dynamic compensator for voltage down and surge
CN1571235A (en) * 2004-04-29 2005-01-26 清华大学 A uniform electric energy quality regulator using DC energy-storage to proceed electric isolation
CN1604421A (en) * 2004-08-11 2005-04-06 北京四方清能电气电子有限公司 Unified electric energy quality controller

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CN1571235A (en) * 2004-04-29 2005-01-26 清华大学 A uniform electric energy quality regulator using DC energy-storage to proceed electric isolation
CN1604421A (en) * 2004-08-11 2005-04-06 北京四方清能电气电子有限公司 Unified electric energy quality controller

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