CN202488150U - Three-phase-integrated power quality control device with by-pass switch - Google Patents
Three-phase-integrated power quality control device with by-pass switch Download PDFInfo
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- CN202488150U CN202488150U CN2012201170186U CN201220117018U CN202488150U CN 202488150 U CN202488150 U CN 202488150U CN 2012201170186 U CN2012201170186 U CN 2012201170186U CN 201220117018 U CN201220117018 U CN 201220117018U CN 202488150 U CN202488150 U CN 202488150U
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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
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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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Abstract
A three-phase-integrated power quality control device with a by-pass switch mainly comprises the by-pass switch and three full-bridge units. The three-phase-integrated power quality control device with the by-pass switch is characterized in that the by-pass switch is connected in parallel between a power supply and a load, each full-bridge unit comprises a paralleling unit, a serial unit and a energy storage unit, the parallel unit comprises an inverter bridge made up of two switch tubes and a filter made up of a capacitance and an inductance, and the energy storage unit is made up of two groups of direct-current capacitances connected serially. Since the three-phase-integrated power quality control device with the by-pass switch adopts phase-spanning connection, faults such as capacitance direct connection and alternating-current short circuit caused by shared energy storage part of serial-parallel units are avoided, and extra quarantine measures are not needed to be taken. Serial units of respective phase are serially connected with the power supply, paralleling units of respective phase form a triangle on the load side, and storage units of respective phase are mutually independent. The three-phase-integrated power quality control device with the by-pass switch has the functions of harmonic current compensation, voltage dropping, surging and 100% single-phase dropping and the like.
Description
Technical field
The utility model relates to a kind of quality of power supply control device, exactly discloses a kind of three-phase unified electric energy quality control apparatus with by-pass switch.
Background technology
Power quality problem can be divided into two big types: 1, quality of voltage problem, the quality of the reliability of confession under directions electricity and the amplitude of supply power voltage, waveform, frequency etc.; 2, electric current quality problems refer to idle, the humorous size that involves negative sequence component in the load current, and these two problems all are that electric power system is paid close attention to.These two types of problems can utilize corresponding power electronic equipment to solve, and can solve the quality of voltage problem like dynamic voltage compensator, and Active Power Filter-APF can solve the electric current quality problems.
Unified electric energy quality controller (UPQC) has combined 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, parallelly connected unit 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; The parallel connection unit solves the electric current quality problems as current compensation, is equivalent to an Active Power Filter-APF; Dc energy storage unit is made up of direct current capacitor, and is shared with parallelly connected unit institute for series connection, to them the galvanic current pressure is provided.Owing to dc capacitor is that connection in series-parallel Unit two institute is shared; In traditional U PQC topology; For preventing faults such as ac short circuit, dc capacitor be straight-through, must take certain electrical isolation between the alternating current-direct current, be employed in series connection usually and realize isolation with the method that parallelly connected both sides install transformer respectively additional.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.
The utility model belongs to the three-phase unified electric energy quality control apparatus, and it takes to stride the design of phase structure, thereby has avoided short circuit problem; Need not extra isolating transformer, can solve problems such as the load harmonic problem, imbalance problem, the power factor that cause are low, what can solve mains side again falls problem such as surge; By-pass switch is that installation, maintenance etc. provide convenience; Increased the reliability of device, need not jumbo energy storage, single-phasely fallen at 100% o'clock and also can compensate.Three-phase three wire system can be applied to, three-phase four wire system can be applied to again.
Summary of the invention
The purpose of the utility model provides a kind of a kind of three-phase unified electric energy quality control apparatus with by-pass switch that need not to take quarantine measures, with each item voltage compensation and the electric current compensation function of realizing that traditional three-phase UPQC is had.This device mainly comprises: by-pass switch, three full bridge unit constitute; It is characterized in that:
Described by-pass switch comprises:
By-pass switch is attempted by between power supply and the load;
The mains side isolating switch is serially connected between power supply and the following full bridge unit;
The load side isolating switch is serially connected between load and the following full bridge unit.
Described three full bridge unit; Each full bridge unit comprises: 1 parallelly connected unit and 1 series unit and an energy-storage units; Series unit is directly gone here and there with power supply mutually; Triangular structure is formed in load side in the parallel connection unit, and described parallelly connected unit comprises an inverter bridge and a filter inductance of being made up of the switching tube of two forward series connection; The serial connection point of said two switching tubes of one termination of this filter inductance; The input of another termination load side isolating switch, the pwm voltage ripple of said inverter bridge output are used for control flows and cross the electric current of above-mentioned filter inductance, 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 series unit; The low pass filter and the bypass thyristor that comprise the inverter bridge formed by the switching tube of two other forward series connection, form by filter capacitor and another filter inductance; Serial connection point in the said series unit of one termination of this filter inductance between two switching tubes of inverter bridge; Filter capacitor in the said series unit and the serial connection of filter inductance point connect the output of mains side isolating switch; This serial connection point connects an end of said bypass thyristor simultaneously, and the other end of this bypass thyristor is connected to the input of load side isolating switch with the other end of above-mentioned filter capacitor, and the inverter bridge of said series unit produces suitable pwm voltage ripple and comes the falling of offset supply voltage, surge, harmonic wave and negative phase-sequence composition; Low pass filter in the said series unit is used for the switch harmonic component in the filtering pwm voltage ripple; Said bypass thyristor is in supply voltage conducting just often, and supply voltage directly offers load by it, when the quality of voltage problem occurring, turn-offs.
Described energy-storage units; Be composed in series by two groups of dc capacitor forwards; The serial connection point of said two groups of dc capacitors is connected to the load side of said bypass thyristor; Said energy-storage units simultaneously and connect the two ends of series unit inverter bridge, parallelly connected unit inverter bridge, this energy-storage units is that said series unit and parallelly connected unit provide galvanic current to press.
Described a kind of three-phase unified electric energy quality control apparatus with by-pass switch, the switching tube of wherein forming parallelly connected unit and series unit are any in insulated gate bipolar transistor, gate level turn-off thyristor, the integral gate change transistor.
A kind of three-phase unified electric energy quality control apparatus with by-pass switch that the present invention proposes has following advantage:
1, isolating switch has brought convenience for installing, safeguarding;
2, compare with traditional U PQC, do not introduce transformer or other isolation links, many unfavorable factors of having avoided transformer to bring, and simple in structure, cost is lower;
3, storage capacitor is that connection in series-parallel unit institute is shared, 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;
4, owing to take to stride phase structure design, need not jumbo energy storage, single-phasely fall at 100% o'clock and also can compensate;
5, each item function of traditional three-phase UPQC can be realized, all kinds of voltage and current quality problems can be effectively solved.
In a word, the three-phase unified electric energy quality control apparatus that the utility model proposes had both saved the additional isolation link, can realize each item current compensation and the voltage compensating function of traditional three-phase UPQC again.
Description of drawings
Referring to accompanying drawing:
Fig. 1 is a circuit diagram of the present invention;
Fig. 2 is compensation harmonic and unbalanced analogous diagram;
Fig. 3 a, b are the simulation waveform figure of compensation three-phase voltage when falling;
Fig. 4 a, b are the single-phase analogous diagram of falling at 100% o'clock of compensation.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the technical characterictic of the utility model is described further.
The circuit diagram of the utility model proposes a kind of three-phase unified electric energy quality control apparatus with by-pass switch is as shown in Figure 1, mainly comprises: the filter capacitor 1 in the series unit, the bypass thyristor 2 in the series unit, the filter inductance 3 in the series unit; 4,5, two direct current capacitor groups 6,7 of switching tube in the series unit are composed in series energy-storage units; The switching tubes 8,9 of two forwards series connection are formed the inverter bridge of parallelly connected unit; The filter inductance 10 of parallel connection unit, the isolating switch 11 of mains side, the isolating switch 12 and the by-pass switch 13 of load side.
During installation and maintenance, closes bypass switch 13, the isolating switch 11 of opening power side, the isolating switch 12 of load side; During normal the operation, the isolating switch 11 of closed mains side, the isolating switch 12 of load side are opened by-pass switch 13.
When current harmonics, three-phase imbalance or idle electric current quality problems such as bigger 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; Start working in the parallel connection unit; Compare with the electric current of standard according to load current, control switching tube (like " 8 ", " 9 " of A phase) the output corresponding compensation amount of parallelly connected unit, thereby make source current sinusoidal, smooth, symmetrical.
When the quality of voltage problem appears in mains side; In order to guarantee that load side voltage still is the sinusoidal quantity three symmetrical, that amplitude is specified; Break off bypass thyristor (like " 2 " of A phase); Control series unit (like " 4 ", " 5 " of A phase) output corresponding compensation amount makes load voltage not receive the influence of mains side quality of voltage, has protected load.
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.Accompanying drawing 2 is the compensation effect of load harmonic wave when uneven, though load has harmonic wave, wave distortion is serious and asymmetric, after overcompensation, source current is sinusoidal and symmetrical.Accompanying drawing 3 falls to three-phase has taken place between the 1.5s at 0.8s for supply voltage; After overcompensation; The sine wave that load voltage is always is three symmetrical, amplitude is specified, the single-phase 100% compensation waveform that falls takes place for supply voltage in accompanying drawing 4, owing to take to stride phase structure; Obtained energy mutually from other two, even single-phase 100% falls and obtained good compensation equally.Explain that the quality of power supply control device that the present invention proposes can solve all kinds of power quality problems effectively.
Claims (3)
1. the three-phase unified electric energy quality control apparatus with by-pass switch mainly comprises: by-pass switch and three full bridge unit formations; It is characterized in that:
Described by-pass switch comprises:
By-pass switch is connected in parallel between power supply and the load;
The mains side isolating switch is connected between power supply and the full bridge unit;
The load side isolating switch is connected between load and the full bridge unit;
Described full bridge unit has 3, and each full bridge unit comprises a parallelly connected unit, a series unit and an energy-storage units, and series unit is directly gone here and there with power supply mutually, and triangular structure is formed in load side in parallelly connected unit.
2. a kind of three-phase unified electric energy quality control apparatus with by-pass switch according to claim 1 is characterized in that:
Described parallelly connected unit comprises inverter bridge and a filter inductance of being made up of the switching tube of two forward series connection, the serial connection point of said two switching tubes of a termination of this filter inductance, the input of another termination load side isolating switch;
Described series unit; The low pass filter and the bypass thyristor that comprise the inverter bridge formed by the switching tube of two other forward series connection, form by filter capacitor and another filter inductance; One end of this filter inductance connects the serial connection point between two switching tubes of inverter bridge in the said series unit; Filter capacitor in the said series unit and the serial connection of filter inductance point connect the output of mains side isolating switch; This serial connection point connects an end of said bypass thyristor simultaneously, and the other end of this bypass thyristor is connected to the input of load side isolating switch with the other end of above-mentioned filter capacitor;
Described energy-storage units is composed in series by two groups of dc capacitor forwards, and the serial connection point of said two groups of dc capacitors is connected to the load side of described bypass thyristor, and said energy-storage units simultaneously and connect the two ends of series unit inverter bridge, parallelly connected unit inverter bridge.
3. a kind of three-phase unified electric energy quality control apparatus with by-pass switch according to claim 1 is characterized in that: the switching tube of parallelly connected unit of described composition and series unit is any in insulated gate bipolar transistor, gate level turn-off thyristor, the integral gate change transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201170186U CN202488150U (en) | 2012-03-26 | 2012-03-26 | Three-phase-integrated power quality control device with by-pass switch |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201170186U CN202488150U (en) | 2012-03-26 | 2012-03-26 | Three-phase-integrated power quality control device with by-pass switch |
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| CN202488150U true CN202488150U (en) | 2012-10-10 |
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| CN2012201170186U Expired - Fee Related CN202488150U (en) | 2012-03-26 | 2012-03-26 | Three-phase-integrated power quality control device with by-pass switch |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106921162A (en) * | 2017-04-17 | 2017-07-04 | 贵州电网有限责任公司电力科学研究院 | A kind of bridge transformer carries out the bypass examination and repair system and method for power quality controlling |
-
2012
- 2012-03-26 CN CN2012201170186U patent/CN202488150U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106921162A (en) * | 2017-04-17 | 2017-07-04 | 贵州电网有限责任公司电力科学研究院 | A kind of bridge transformer carries out the bypass examination and repair system and method for power quality controlling |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121010 Termination date: 20130326 |