CN102983584A - Unified power flow controller used for unbalanced system - Google Patents
Unified power flow controller used for unbalanced system Download PDFInfo
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- CN102983584A CN102983584A CN201210267168XA CN201210267168A CN102983584A CN 102983584 A CN102983584 A CN 102983584A CN 201210267168X A CN201210267168X A CN 201210267168XA CN 201210267168 A CN201210267168 A CN 201210267168A CN 102983584 A CN102983584 A CN 102983584A
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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
- Y02E40/10—Flexible AC transmission systems [FACTS]
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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
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Abstract
The invention relates to a unified power flow controller used for an unbalanced system. The unified power flow controller comprises a static synchronization compensator and a static synchronization series compensator. An upper part split capacitance and a lower part capacitance are arranged between the static synchronization compensator and the static synchronization series compensator. The upper part split capacitance and the lower part split capacitance are connected in series and then respectively connected with the static synchronization compensator and the static synchronization series compensator in parallel. The upper part split capacitance and the lower part split capacitance are connected in series and then a split capacitance branch circuit is formed. A midpoint of the split capacitance branch circuit is connected with a neutral point of the static synchronization series compensator. Output ends of the static synchronization compensator and the static synchronization series compensator are respectively connected with a power grid. The unified power flow controller is convenient to split-phase control and modularization design, small in running loss, good in voltage control capacity, good in zero-sequence current controlling, few in element quantity, low in cost and high in cost performance.
Description
Technical field
The present invention relates to the THE UPFC in a kind of Survey of Flexible AC Transmission System field, be specifically related to a kind of THE UPFC for unbalanced system.
Background technology
110kV and above neutral point of electric network adopt direct grounding way, when threephase load is asymmetric, zero-sequence current can occur on the circuit.The imbalance of three-phase voltage degree is an important indicator weighing the electrical network quality of power supply.Along with the raising that people require the quality of power supply, voltage imbalance question is just receiving increasing concern.In three-phase system, cause that the reason of Voltage unbalance is mainly from two aspects: the output voltage of generator is uneven and load is asymmetric.Theoretically, the output voltage of generator is not full symmetric, has certain degree of unbalance, but in the scope that the standard that all should be limited in allows.The impossible full symmetric of the threephase load of distribution end, the occasion that particularly exists at the large capacity single phase load, voltage imbalance question is particularly serious.When Voltage unbalance is comparatively serious, will affect the normal operation of some equipment, such as motor, power electronic equipment etc.Electric locomotive is the very large high-power single-phase rectification load of fluctuation, power system power supply for three-phase symmetrical, electricity railway traction load has the characteristics of non-linear, asymmetric and fluctuation, with producing the harmonic current injection system of three-phase imbalance, makes the voltage fluctuation of electric power system.Therefore, at the electric locomotive high speed development, under the increasing background of electric network influencing, seem particularly important for the control of unbalanced system.
THE UPFC (UPFC) is flexible AC transmission of new generation (FACTS) device that a kind of function is the most powerful, characteristic is superior, it is the best FACTS device of versatility up to now, combine the multiple flexible control device of FACTS element, only by the change of control law, just can be respectively or realize simultaneously several different functions such as shunt compensation, series compensation and phase shift.The UPFC device can be regarded as a STATCOM (STATCOM) device and consists of at DC side parallel with a Static Series Synchronous Compensator (SSSC) device, it can be simultaneously and fast, active power and reactive power in the independent control transmission line, thereby so that UPFC has the four quadrant running function that STATCOM, SSSC device do not possess.
UPFC device main circuit topology adopts the mode of two voltage source converters (VSC) DC side parallel, and wherein an AC side of converter is direct or in parallel with system by transformer, and another AC side of converter is by transformer and Cascade System.Each voltage source converter adopts two level or three level three-phase voltage source converter structures usually.
Among the large capacity UPFC, the mode that the common employing of voltage source converter can be turn-offed power electronic device (typical device such as insulated gate bipolar transistor IGBT) series connection improves the voltage endurance capability of device.The technological difficulties of turn-off device IGBT series connection are mainly manifested in: be subjected to the impact of technical monopoly, the IGBT device with self limiting short-circuit current characteristic is difficult to buying, and it is not deep enough that the control technology of IGBT series average-voltage is studied in theory.For reducing the device output harmonic wave, need to adopt higher switching frequency, thereby the device running wastage is larger.These have limited the application of large capacity UPFC.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of THE UPFC UPFC main circuit topological structure, adopt modularization multi-level converter to consist of current transformer, the technological difficulties of device series connection have been avoided, this THE UPFC has following characteristics: be convenient to minute phase control and modularized design, but by redundant technique bypass trouble unit, and then improve the THE UPFC operational reliability, the devices switch frequency is low, and THE UPFC UPFC running wastage is little.Dc bus adopts two capacitors to divide mid-point voltage, and is connected with the output transformer neutral point, consists of three-phase and four-line MMC converter, and have the following advantages: voltage control capability is good, and zero-sequence current is controlled well, and number of elements is few, and cost is low, and cost performance is high.
The objective of the invention is to adopt following technical proposals to realize:
A kind of THE UPFC for unbalanced system, its improvements are that described THE UPFC comprises STATCOM 1 and Static Series Synchronous Compensator 2;
Between described STATCOM 1 and Static Series Synchronous Compensator 2, be provided with top split capacitor 3 and bottom split capacitor 4; In parallel with STATCOM 1 and Static Series Synchronous Compensator 2 respectively after described top split capacitor 3 and 4 series connection of bottom split capacitor;
Form the split capacitor branch road after described top split capacitor 3 and 4 series connection of bottom split capacitor; The mid point of described split capacitor branch road is connected with the neutral point of the series transformer 11 of described Static Series Synchronous Compensator 2;
The output of described STATCOM 1 be connected the output of Static Series Synchronous Compensator 2 and be connected with electrical network respectively.
Wherein, described STATCOM 1 comprises start-up circuit 6, converter 8 and access transformer 9;
Described converter 8 one ends successively by described start-up circuit 6 be connected transformer 9 and be connected with electrical network;
The secondary of described access transformer 9 is connected with described start-up circuit 6; The former limit of described access transformer 9 is connected with described electrical network.
Wherein, described converter 8 is made of three-phase; Parallel three phase; Every identical up and down two brachium pontis of structure by series connection consist of; The midpoint of two brachium pontis is drawn the output as described STATCOM 1 up and down.
Wherein, each brachium pontis comprises 1 reactor and N the submodule that structure is identical in described up and down two brachium pontis; An end is connected with described start-up circuit 6 by reactor after the submodule cascade of each brachium pontis; The other end is connected with submodule one end of the cascade of other two-phase brachium pontis after the submodule cascade of each brachium pontis, forms the both positive and negative polarity bus of described converter 8; Or
Each brachium pontis comprises 1 reactor and N the submodule that structure is identical in described up and down two brachium pontis; An end is connected with described start-up circuit 6 after the submodule cascade of each brachium pontis; Be connected with other reactor of two-phase brachium pontis behind the other end series reactor after the submodule cascade of each brachium pontis, form the both positive and negative polarity bus of described converter 8.
Wherein, described start-up circuit 6 comprises resistance and switch in parallel.
Wherein, described Static Series Synchronous Compensator 2 comprises start-up circuit 7, converter 10 and series transformer 11;
Described converter 10 1 ends are connected with series transformer and are connected with electrical network by start-up circuit 7 successively.
Described converter 10 other ends are connected with the other end of converter 8 by the split capacitor branch road.
Wherein, described converter 10 is made of three-phase; Parallel three phase; Every identical up and down two brachium pontis of structure by series connection consist of; The midpoint of two brachium pontis is drawn the output as described Static Series Synchronous Compensator 2 up and down.
Wherein, each brachium pontis comprises 1 reactor and M the submodule that structure is identical in described up and down two brachium pontis; An end is connected with described series transformer 11 by reactor after the submodule cascade of each brachium pontis; The other end is connected with submodule one end of the cascade of other two-phase brachium pontis, forms described converter 10 both positive and negative polarity buses, respectively with the corresponding connection of both positive and negative polarity bus of described converter 8; Or
Each brachium pontis comprises 1 reactor and M the submodule that structure is identical in described up and down two brachium pontis; An end is connected with described series transformer 11 by reactor after the submodule cascade of each brachium pontis; Be connected with other reactor of two-phase brachium pontis behind the other end series reactor, form the both positive and negative polarity bus of described converter 10, respectively with the corresponding connection of both positive and negative polarity bus of described converter 8.
Wherein, described start-up circuit 7 comprises resistance and switch in parallel.
Wherein, described THE UPFC comprises by-pass switch 5; Described by-pass switch 5 is in parallel with described series transformer 11.
Wherein, are connected with start-up circuit with electrical network respectively and are connected in the former limit of described series transformer 11; Described series transformer 11 secondary are connected with load.
Wherein, described submodule consists of by half-bridge structure is in parallel with dc capacitor, and described half-bridge structure comprises the IGBT module of two series connection, and each IGBT module comprises antiparallel IGBT and diode;
Submodule bypass circuit in parallel between described half-bridge structure mid point and the IGBT emitter;
Described dc capacitor can power supply provides power supply for the control circuit of submodule by getting.
Wherein, the both positive and negative polarity bus of described converter 8 and converter 10 both positive and negative polarity buses are called dc bus; Described dc bus adopts top split capacitor 3 and bottom split capacitor 4 to divide mid-point voltage, and is connected with the neutral point of series transformer 11, consists of three-phase and four-line modularization multi-level converter MMC.
Compared with the prior art, the beneficial effect that reaches of the present invention is:
1, the THE UPFC for unbalanced system provided by the invention can significantly improve the THE UPFC capacity, need not to adopt the technology of complicated IGBT device series connection;
2, the THE UPFC for unbalanced system provided by the invention can realize a minute phase control;
3, the THE UPFC for unbalanced system provided by the invention can realize modularized design;
4, but the THE UPFC for unbalanced system provided by the invention is passed through redundant technique bypass trouble unit, improves the device operational reliability;
5, the THE UPFC for unbalanced system provided by the invention, for reducing output harmonic wave, IGBT device tandem plan switching frequency is usually very high, and the device loss is large; This programme has adopted the modular multilevel technology, and the switching frequency of each device is low, but can realize that external equivalent switching frequency is very high, reduces output harmonic wave, and it is little therefore to install running wastage;
6, the THE UPFC for unbalanced system provided by the invention, three-phase and four-line topological structure voltage control capability is good, and zero-sequence current is controlled well, and number of elements is few, and cost is low, and cost performance is high.
Description of drawings
Fig. 1 is the single-phase MMC topology diagram of series side;
Fig. 2 is series side four brachium pontis MMC topology diagrams;
Fig. 3 is three-phase and four-line MMC topological project one schematic diagram of the THE UPFC series side band split capacitor for unbalanced system provided by the invention;
Wherein: (1) is that STATCOM, (2) are series transformer for access transformer, (10) for converter, (11) for converter, (9) for start-up circuit, (8) for start-up circuit, (7) for by-pass switch, (6) for bottom split capacitor, (5) for top split capacitor, (4) for Static Series Synchronous Compensator, (3).
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
The present invention proposes a kind of THE UPFC UPFC for unbalanced system, the technological difficulties of having evaded the device series connection, have and be convenient to minute phase control and modularized design, but by redundant technique bypass trouble unit, improve the THE UPFC operational reliability, and the devices switch frequency is low, and the THE UPFC running wastage is little.
Series side MMC converter can adopt following several scheme:
I, the single-phase MMC scheme of series side (accompanying drawing 1).The every full bridge structure that adopts mutually of series side, output seals in circuit by single-phase transformer.But this scheme series side three-phase independent regulation, control is flexible, superior performance, and control strategy is relatively simple.But this scheme number of elements is maximum, and cost is the highest, and cost performance is low.
II, series side four brachium pontis MMC schemes (accompanying drawing 2).Series side is made of four MMC brachium pontis, and output seals in circuit by single-phase or three-phase (five posts) transformer.This scheme series side three-phase voltage is controlled flexibly like that not as single-phase invertor, and number of elements is many, and cost is high, and cost performance is lower.
The three-phase and four-line MMC scheme (accompanying drawing 3) of III, series side band split capacitor.Dc bus adopts two capacitors to divide mid-point voltage, and is connected with the output transformer neutral point, consists of three-phase and four-line MMC converter, have following characteristics: voltage control capability is better, and zero-sequence current control is better, and number of elements is less, cost is lower, and cost performance is higher.
The present invention adopts the three-phase and four-line MMC scheme of series side band split capacitor.
Embodiment 1
The three-phase and four-line MMC topological project one of a kind of THE UPFC series side band split capacitor for unbalanced system provided by the invention as shown in Figure 3, THE UPFC comprises STATCOM 1 and Static Series Synchronous Compensator 2; Between STATCOM 1 and Static Series Synchronous Compensator 2, be provided with top split capacitor 3 and bottom split capacitor 4; In parallel with STATCOM 1 and Static Series Synchronous Compensator 2 respectively after top split capacitor 3 and 4 series connection of bottom split capacitor; Form the split capacitor branch road after top split capacitor 3 and 4 series connection of bottom split capacitor; The mid point of split capacitor branch road is connected with the neutral point of the series transformer 11 of described Static Series Synchronous Compensator 2; The output of STATCOM 1 be connected the output of Static Series Synchronous Compensator 2 and be connected with electrical network respectively.
The both positive and negative polarity bus of STATCOM 1 and Static Series Synchronous Compensator 2 both positive and negative polarity buses are called dc bus; Dc bus adopts two capacitors 3 and 4 to divide mid-point voltage, and is connected with series transformer 11 neutral points, consists of three-phase and four-line MMC converter.Neutral point current can flow through two split capacitor devices 3 and 4.
STATCOM 1 links to each other by the intermediate dc link that is made of split capacitor 3 and 4 with Static Series Synchronous Compensator 2, and active power can be carried out bi-directional between two current converters like this; Reactive power can be exchanged with system at its AC independently by each current converter.
STATCOM 1 comprises start-up circuit 6, converter 8 and access transformer 9; Converter 8 one ends successively by start-up circuit 6 be connected transformer 9 and be connected with electrical network; The secondary of access transformer 9 is connected with start-up circuit 6; The former limit of access transformer 9 is connected with electrical network.
Converter 8 is made of three-phase; Parallel three phase; Every identical up and down two brachium pontis of structure by series connection consist of; The midpoint of two brachium pontis is drawn the output as STATCOM 1 up and down.
Wherein, up and down in two brachium pontis each brachium pontis comprise 1 reactor and N (N the is natural number) submodule that individual structure is identical; An end is connected with start-up circuit 6 by reactor after the submodule cascade of each brachium pontis; The other end is connected with submodule one end of the cascade of other two-phase brachium pontis after the submodule cascade of each brachium pontis, forms the both positive and negative polarity bus of converter 8; Concrete, half-bridge brachium pontis mid point and lower pipe IGBT emitter are connected with the submodule of front and back successively respectively as the submodule exit, connect with 1 change of current reactance to consist of 1 brachium pontis again.Two brachium pontis series connection consist of 1 phase current converter up and down, and the three-phase current converter is whole in parallel, and draws positive and negative busbar.The upper and lower bridge arm midpoint is drawn the output as the STATCOM converter, after start-up circuit 6 is connected, by the transformer in parallel with system 9 connecting systems.Access transformer 9 is used for realizing the coupling of system voltage and STATCOM device output voltage.
Start-up circuit 6 is made of with the starting resistance by-pass switch is in parallel starting resistance.Start-up circuit 6 is used for realizing the soft start of STATCOM 1.
Converter 10 is identical with converter 8 structures, and converter 10 is made of three-phase; Parallel three phase; Every identical up and down two brachium pontis of structure by series connection consist of; The midpoint of two brachium pontis is drawn the output as described Static Series Synchronous Compensator 2 up and down.
Each brachium pontis comprises 1 reactor and M (M is natural number, and M can equal N, also can the be not equal to N) submodule that individual structure is identical in two brachium pontis up and down; An end is connected with described series transformer 11 by reactor after the submodule cascade of each brachium pontis; The other end is connected with submodule one end of the cascade of other two-phase brachium pontis, forms described converter 10 both positive and negative polarity buses, respectively with the corresponding connection of both positive and negative polarity bus of described converter 8.
Concrete, half-bridge brachium pontis mid point and lower pipe IGBT emitter are connected with the submodule of front and back successively respectively as the submodule exit, connect with 1 change of current reactance to consist of 1 brachium pontis again.Two brachium pontis series connection consist of 1 phase current converter up and down, and the three-phase current converter is whole in parallel, and draws positive and negative busbar.The upper and lower bridge arm midpoint is drawn the output as the SSSC converter, after start-up circuit 7 is connected, by with transformer 11 connecting systems of Cascade System.The submodule of present embodiment is connected with system by reactor, can suppress on the one hand thunder and lightning, operation ripple from electrical network to the infringement of equipment, can suppress the current converter output harmonic wave on the other hand.
Series transformer 11 neutral points divide the mid point that and are connected after the series connection with being connected with the bottom split capacitor by top split capacitor 3.Former limit one end of series transformer 11 is connected with system, and an end is connected with load.Series transformer 11 is used for realizing the coupling of system voltage and Static Series Synchronous Compensator 2 output voltages.
Start-up circuit 7 is made of with the starting resistance by-pass switch is in parallel starting resistance.Start-up circuit 7 is used for realizing the soft start of Static Series Synchronous Compensator 2.
Preferably, the THE UPFC of present embodiment also is provided with by-pass switch 5 for the safety setting, and by-pass switch 5 is in parallel with series transformer 11, is used for realizing withdrawing from of Static Series Synchronous Compensator.
The submodule of present embodiment is used for the output required voltage, it is made of half-bridge structure and dc capacitor, described half-bridge structure comprises the up and down IGBT module of two series connection, parallel connection direct electric capacity between upper pipe IGBT collector electrode and the lower pipe IGBT emitter, submodule bypass circuit in parallel between half-bridge structure mid point and the lower pipe IGBT emitter, get can power supply from the direct current capacitor power taking, for the control circuit of submodule provides the control power supply.The dc capacitor of submodule is used for providing the submodule voltage support.During the submodule internal fault, its bypass circuit is used for making submodule out of service, realizes the redundancy running of STATCOM.Get and to be used for providing the control power supply to the submodule control circuit by power supply.Control circuit is used for realization to control, monitoring and the protection of submodule.The bypass circuit of present embodiment can be realized that by switch control circuit can be realized by numeral or analog circuit.Can power supply referenced patent 201010624225.6 or ZL201020700480.X realization but get.
Embodiment 2
Present embodiment is substantially the same manner as Example 1, but distinctive points is:
The position of the reactor in converter 8 and the converter 10 is different.The reactor string of present embodiment is in the positive and negative busbar side, and it is used for suppressing the current converter output harmonic wave.
Concrete, converter 8 is made of three-phase; Parallel three phase; Every identical up and down two brachium pontis of structure by series connection consist of; The midpoint of two brachium pontis is drawn the output as STATCOM 1 up and down.Each brachium pontis comprises 1 reactor and N the submodule that structure is identical in two brachium pontis up and down; An end is connected with start-up circuit 6 after the submodule cascade of each brachium pontis; Be connected with other reactor of two-phase brachium pontis behind the other end series reactor after the submodule cascade of each brachium pontis, form the both positive and negative polarity bus of described converter 8.
Converter 10 is made of three-phase; Parallel three phase; Every identical up and down two brachium pontis of structure by series connection consist of; The midpoint of two brachium pontis is drawn the output as described Static Series Synchronous Compensator 2 up and down.Each brachium pontis comprises 1 reactor and M the submodule that structure is identical in two brachium pontis up and down; An end is connected with described series transformer 11 by reactor after the submodule cascade of each brachium pontis; Be connected with other reactor of two-phase brachium pontis behind the other end series reactor, form the both positive and negative polarity bus of described converter 10, respectively with the corresponding connection of both positive and negative polarity bus of described converter 8.
THE UPFC UPFC for unbalanced system provided by the invention, wherein dc bus adopts two capacitors to divide mid-point voltage, and be connected with the output transformer neutral point, consist of three-phase and four-line MMC converter, have following characteristics: voltage control capability is good, and zero-sequence current is controlled well, and number of elements is few, cost is low, and cost performance is high.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or be equal to replacement the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (12)
1. a THE UPFC that is used for unbalanced system is characterized in that described THE UPFC comprises STATCOM (1) and Static Series Synchronous Compensator (2);
Between described STATCOM (1) and Static Series Synchronous Compensator (2), be provided with top split capacitor (3) and bottom split capacitor (4); In parallel with STATCOM (1) and Static Series Synchronous Compensator (2) respectively after described top split capacitor (3) and bottom split capacitor (4) series connection;
Form the split capacitor branch road after described top split capacitor (3) and bottom split capacitor (4) series connection; The mid point of described split capacitor branch road is connected with the neutral point of the series transformer (11) of described Static Series Synchronous Compensator (2);
Described THE UPFC comprises by-pass switch (5); Described by-pass switch (5) is in parallel with described series transformer (11);
The output of described STATCOM (1) be connected the output of Static Series Synchronous Compensator (2) and be connected with electrical network respectively.
2. THE UPFC as claimed in claim 1 is characterized in that, described STATCOM (1) comprises start-up circuit (6), converter (8) and access transformer (9);
Described converter (8) one ends successively by described start-up circuit (6) be connected transformer (9) and be connected with electrical network;
The secondary of described access transformer (9) is connected with described start-up circuit (6); The former limit of described access transformer (9) is connected with described electrical network.
3. THE UPFC as claimed in claim 2 is characterized in that, described converter (8) is made of three-phase; Parallel three phase; Every identical up and down two brachium pontis of structure by series connection consist of; The midpoint of two brachium pontis is drawn the output as described STATCOM (1) up and down.
4. THE UPFC as claimed in claim 3 is characterized in that, each brachium pontis comprises 1 reactor and N the submodule that structure is identical in described up and down two brachium pontis; An end is connected with described start-up circuit (6) by reactor after the submodule cascade of each brachium pontis; The other end is connected with submodule one end of the cascade of other two-phase brachium pontis after the submodule cascade of each brachium pontis, forms the both positive and negative polarity bus of described converter (8); Or
Each brachium pontis comprises 1 reactor and N the submodule that structure is identical in described up and down two brachium pontis; An end is connected with described start-up circuit (6) after the submodule cascade of each brachium pontis; Be connected with other reactor of two-phase brachium pontis behind the other end series reactor after the submodule cascade of each brachium pontis, form the both positive and negative polarity bus of described converter (8).
5. THE UPFC as claimed in claim 2 is characterized in that, described start-up circuit (6) comprises resistance and switch in parallel.
6. THE UPFC as claimed in claim 1 is characterized in that, described Static Series Synchronous Compensator (2) comprises start-up circuit (7), converter (10) and series transformer (11);
Described converter (10) one ends are connected 11 by start-up circuit (7) with series transformer successively) be connected with electrical network.
Described converter (10) other end is connected with the other end of converter (8) by the split capacitor branch road.
7. THE UPFC as claimed in claim 5 is characterized in that, described converter (10) is made of three-phase; Parallel three phase; Every identical up and down two brachium pontis of structure by series connection consist of; The midpoint of two brachium pontis is drawn the output as described Static Series Synchronous Compensator (2) up and down.
8. THE UPFC as claimed in claim 7 is characterized in that, each brachium pontis comprises 1 reactor and M the submodule that structure is identical in described up and down two brachium pontis; An end is connected with described series transformer (11) by reactor after the submodule cascade of each brachium pontis; The other end is connected with submodule one end of the cascade of other two-phase brachium pontis, forms described converter (10) both positive and negative polarity bus, respectively with the corresponding connection of both positive and negative polarity bus of described converter (8); Or
Each brachium pontis comprises 1 reactor and M the submodule that structure is identical in described up and down two brachium pontis; An end is connected with described series transformer (11) by reactor after the submodule cascade of each brachium pontis; Be connected with other reactor of two-phase brachium pontis behind the other end series reactor, form described converter (10) both positive and negative polarity bus, respectively with the corresponding connection of both positive and negative polarity bus of described converter (8).
9. THE UPFC as claimed in claim 5 is characterized in that, described start-up circuit (7) comprises resistance and switch in parallel.
10. such as each described THE UPFC among the claim 2-9, it is characterized in that the former limit of described series transformer (11) is connected 7 with electrical network with start-up circuit respectively) be connected; Described series transformer (11) secondary is connected with load.
11. such as claim 4 or 7 described THE UPFC, it is characterized in that, described submodule consists of by half-bridge structure is in parallel with dc capacitor, and described half-bridge structure comprises the IGBT module of two series connection, and each IGBT module comprises antiparallel IGBT and diode;
Submodule bypass circuit in parallel between described half-bridge structure mid point and the IGBT emitter;
Described dc capacitor can power supply provides power supply for the control circuit of submodule by getting.
12., it is characterized in that the both positive and negative polarity bus of described converter (8) and converter (10) both positive and negative polarity bus are called dc bus such as claim 4 or 7 described THE UPFC; Described dc bus adopts top split capacitor (3) and bottom split capacitor (4) to divide mid-point voltage, and is connected with the neutral point of series transformer (11), consists of three-phase and four-line modularization multi-level converter MMC.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210267168.XA CN102983584B (en) | 2012-07-13 | 2012-07-13 | A kind of THE UPFC for unbalanced system |
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| CN201210267168.XA CN102983584B (en) | 2012-07-13 | 2012-07-13 | A kind of THE UPFC for unbalanced system |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103311944A (en) * | 2013-05-16 | 2013-09-18 | 国家电网公司 | Unified power flow controller adopting modular structure and starting method for unified power flow controller |
| CN103490407A (en) * | 2013-09-17 | 2014-01-01 | 南方电网科学研究院有限责任公司 | Synchronous detection method between flexible direct-current power transmission controllers |
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