CN202949235U - Three-level voltage source converter-based HVDC-UPFC system - Google Patents
Three-level voltage source converter-based HVDC-UPFC system Download PDFInfo
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- CN202949235U CN202949235U CN 201220374951 CN201220374951U CN202949235U CN 202949235 U CN202949235 U CN 202949235U CN 201220374951 CN201220374951 CN 201220374951 CN 201220374951 U CN201220374951 U CN 201220374951U CN 202949235 U CN202949235 U CN 202949235U
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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
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Abstract
The utility model brings forward a three-level voltage source converter-based high voltage direct current (HVDC)-unified power flow controller (UPFC) system. The system comprises current conversion apparatuses (1, 2, and 11), ground circuits (3 and 12), a switch (4), and a direct-current power transmission line (13). The current conversion apparatuses (1 and 2) form the UPFC; and the current conversion apparatus (1) and the current conversion apparatus (11) form the HVDC. According to the utility model, the HVDC and the UPFC share one same current conversion apparatus, thereby saving the engineering construction cost and investment, improving the utilization rate of the equipment and realizing centralized management and controlling conveniently. Moreover, the grid-side waveform quality can also be improved.
Description
Technical field
The utility model relates to field of power electronics, is specifically related to a kind of HVDC based on three-level voltage source converter UPFC system of holding concurrently.
Background technology
Develop rapidly under the new situation in distributed power generation, regenerative resource, intelligent grid technology, Technology of HVDC based Voltage Source Converter provides new approach for the deficiency that makes up the conventional high-tension HVDC Transmission Technology.The high voltage direct current transmission of traditional employing half control device thyristor, AC needs reactive power compensator, and the inversion side needs very powerful power supply to carry out active inversion, otherwise can produce commutation failure.Flexible DC power transmission adopts the voltage source converter based on turn-off device, has the ability of cut-off current, uses the PWM technology and carries out passive inverter, and the receiving-end system capacity is not required, and has solved traditional direct current transportation to the difficult problem of passive load point power transmission; Can independently control meritoriously, idle etc., have good control flexibility; In trend when counter-rotating,, direct current direction counter-rotating and direct voltage polarity is constant conveniently consists of the direct current multi-terminal system.
The flexible DC power transmission device adopts the voltage source converter based on turn-off device, has the ability of cut-off current, uses the PWM technology and carries out passive inverter, and the receiving-end system capacity is not required, and has solved traditional direct current transportation to the difficult problem of passive load point power transmission; Can independently control meritoriously, idle etc., have good control flexibility.Its main circuit topology adopts the mode of two voltage source converters (VSC) DC side parallel, wherein a converter AC is direct or in parallel with system by transformer, DC side connects power transmission line, after arriving the destination of transmitting electricity, another converter AC is direct or in parallel with the system of destination by transformer.
THE UPFC (UPFC) is the best FACTS device of versatility up to now, only by the change of control law, and 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, independent active power and the reactive power of controlling in transmission line, thereby make UPFC have the four quadrant running function that STATCOM, SSSC device do not possess.
UPFC system main circuit topology adopts the mode of two voltage source converters (VSC) DC side parallel, and wherein a converter AC is direct or in parallel with system by transformer, and another converter AC is by transformer and Cascade System.Owing to having adopted turn-off device control, make the output voltage of parallel inverter and series winding converter to control separately.Each converter can independently absorb or supply with reactive power and active power at ac output end.
The voltage source converter that flexible DC power transmission and UPFC use adopts two level and two kinds of topological structures of three level usually.The weak point of two level topological structures is, when it is applied to the high pressure occasion, needs with the power switch pipe of high back-pressure or a plurality of power switch pipe series connection are used.In addition, because VSC AC output voltage always switches on two level, when switching frequency is not high, will cause harmonic content relatively large.Use with a plurality of power switch series connection in three level VSC topological structures, and adopt diode clamp to obtain three level modulation of ac output voltage.Three level VSC have reduced AC harmonic voltage, electric current effectively when improving voltage withstand class, thereby have improved its net side waveform quality.
In common Practical Project, flexible DC power transmission device and UPFC independently build with operation often, this has caused the overlapping investment construction, cost is high, utilization rate of equipment and installations is low, management with control the problems such as concentrated.
The utility model content
For the deficiencies in the prior art, the utility model provides a kind of HVDC based on three-level voltage source converter UPFC system of holding concurrently, utilize voltage source converter direct voltage polarity constant, the convenient characteristics that consist of the direct current multi-terminal system, flexible DC power transmission and UPFC share a current converter, have saved engineering construction cost and investment, have improved utilization rate of equipment and installations, be convenient to centralized management and control, and can improve its net side waveform quality.
A kind of HVDC based on the three-level voltage source converter that the utility model provides UPFC system of holding concurrently comprises current converter 1, current converter 2, current converter 11, earthed circuit 3, earthed circuit 12, switch 4 and DC transmission line 13; Its improvements are,
Described current converter 1 one ends are connected with electrical network, after other end earth circuit 3, are divided at least two branch roads, and branch road one is to be connected with described electrical network after the earthed circuit 3 described current converters 2 of two ends connection, consists of one group of THE UPFC UPFC; Branch road two is to be connected with electrical network after earthed circuit 3 two ends are connected with described current converter 11 by described DC transmission line 13, consists of one group of flexible DC power transmission HVDC; Earth electric capacity 12 between described DC transmission line 13 and described current converter 11; Described switch 4 is in parallel with described current converter 2.
Wherein, described current converter 1 comprises converter 6; It is in parallel with electrical network that described converter 6 exchanges end, and its dc terminal is in parallel with described earthed circuit 3.Preferably, described current converter 1 can also comprise start-up circuit 5, is arranged between described converter 6 and described electrical network; Described start-up circuit 5 one ends are connected with described electrical network, and the other end is connected with described converter 6.
Wherein, described current converter 11 comprises converter 15; Described converter 15 ACs are connected between power supply and load by transformer 10, its DC side and 12 parallel connections of described earthed circuit.Preferably, described current converter 11 can also comprise the start-up circuit 14 that is connected between described electrical network and described converter 15.
Wherein, described current converter 2 comprises transformer 10 and converter 9; The former limit of described transformer 10 is connected between described electrical network and load, and described transformer 10 secondary are connected with described converter 6.Preferably, described current converter (2) can also comprise the start-up circuit 8 that is connected between described transformer 10 secondary and described converter 9.
Wherein, described earthed circuit 3 and 12 is ground capacity, the neutral ground of described ground capacity.Perhaps, described earthed circuit 3 and 12 is earth resistance, the neutral ground of described earth resistance.
Wherein, described converter 6,9 and 15 includes three-phase current converter, filter inductance, clamp diode, Support Capacitor; Every phase current converter is in series by upper brachium pontis and lower brachium pontis; Described every phase current converter midpoint is connected with start-up circuit through the ac filter inductance; Described three-phase current converter is in parallel, forms positive and negative busbar;
Described clamp diode comprises brachium pontis clamp diode and lower brachium pontis clamp diode; In described every phase current converter, described upper brachium pontis mid point is connected with upper brachium pontis clamp diode negative electrode, lower brachium pontis mid point and lower brachium pontis clamp diode anodic bonding, and upper brachium pontis clamp diode anode is connected with lower brachium pontis clamp diode negative electrode;
After two described Support Capacitor series connection, be connected in parallel between positive and negative busbar, the mid point of two electric capacity of series connection is connected with the mid point of the clamp diode that often is in series.Preferably, described upper brachium pontis and described lower brachium pontis include the IGBT module of at least two cascades; Described IGBT module comprises antiparallel IGBT and diode.
Wherein, described converter 6,9 and 15 all adopts three level topological structures.
Wherein, described start-up circuit 5,8 and 14 includes resistance and switch in parallel.
Wherein, described flexible DC power transmission HVDC adopts two ends form or multiterminal form; Described THE UPFC UPFC adopts two ends or multiterminal form; Described HVDC holds concurrently in the UPFC system, and the positive and negative busbar of HVDC (being common DC bus) is connected with the positive and negative busbar (being common DC bus) of UPFC.
Compared with the prior art, the beneficial effects of the utility model are:
The utility model uses clamp diode, obtains three level modulation of ac output voltage;
Three level VSC of the present utility model have improved the device for power switching voltage withstand class;
The utility model has reduced AC harmonic voltage, electric current effectively, thereby has improved its net side waveform quality;
The utility model can be realized a minute phase control;
The utility model flexible DC power transmission and UPFC share a current converter, have saved engineering construction cost and investment, have improved utilization rate of equipment and installations, are convenient to centralized management and control.
Description of drawings
The three-level voltage source converter topological structure that Fig. 1 provides for the utility model.
The flexible DC power transmission HVDC based on the three-level voltage source converter that Fig. 2 provides for the utility model THE UPFC UPFC topological diagram (scheme one) of holding concurrently.
The flexible DC power transmission HVDC based on the three-level voltage source converter that Fig. 3 provides for the utility model THE UPFC UPFC topological diagram (scheme two) of holding concurrently.
The flexible DC power transmission HVDC based on the three-level voltage source converter that Fig. 4 provides for the utility model THE UPFC UPFC topology (scheme three) of holding concurrently.
Wherein, (1) is current converter; (2) be current converter; (3) be ground capacity or earth resistance in earthed circuit; (4) be by-pass switch; (5) be start-up circuit; (6) be converter; (7) be transformer; (8) be start-up circuit; (9) be converter; (10) be transformer; (11) be current converter; (12) be earthed circuit; (13) be DC transmission line; (14) be start-up circuit; (15) be converter; (16) be transformer; (17) be filter inductance; (18) be the IGBT module of two cascades of upper brachium pontis; (19) be the IGBT module of two cascades of lower brachium pontis; (20) be clamp diode; (21) be clamp diode; (22) be Support Capacitor; (23) be Support Capacitor.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.
Embodiment one
A kind of HVDC based on the three-level voltage source converter that the present embodiment provides UPFC system of holding concurrently, its topological diagram such as Fig. 2 or shown in Figure 3 comprise current converter 1, current converter 2, current converter 11, earthed circuit 3, earthed circuit 12, switch 4 and DC transmission line 13; Wherein switch 4 is by-pass switch;
Described current converter 1 one ends are connected with electrical network, and the other end is in parallel with earthed circuit 3; Earthed circuit 3 two ends are divided at least two branch roads, and branch road one is to be connected with described electrical network after the earthed circuit 3 described current converters 2 of two ends connection, consists of one group of THE UPFC UPFC; Branch road two is to be connected with electrical network after earthed circuit 3 two ends are connected with described current converter 11 by described DC transmission line 13, consists of one group of flexible DC power transmission HVDC; Earth electric capacity 12 between described DC transmission line 13 and described current converter 11; Switch 4 is in parallel with described current converter 2.
Wherein, each device is constructed as follows:
Described current converter 1 comprises start-up circuit 5 and converter 6 (converter 6 is cascade half-bridge structure voltage source converter, for flexible DC power transmission and THE UPFC shared).Described start-up circuit 5 one ends are connected with electrical network, the other end and 6 series connection of described converter.
Described current converter 11 comprises start-up circuit 14 and converter 15; Described start-up circuit 14 1 ends are connected with electrical network, the other end and 15 series connection of described converter.
Described current converter 2 comprises transformer 10, start-up circuit 8 and converter 9; The described electrical network of the former limit of described transformer 10 series connection access, described transformer 10 secondary are connected with described start-up circuit 8 and described converter 9 successively; The former limit of described transformer 10 is connected with load.
Described earthed circuit 3 and 12---flexible DC power transmission and THE UPFC shares, and it is ground capacity (as Fig. 2) or earth resistance (as Fig. 3), is used for preventing electric potential floating, fixed system current potential; The neutral ground of described ground capacity; The neutral ground of described earth resistance.
The topological diagram of described converter 6 comprises three-phase current converter, filter inductance, clamp diode, Support Capacitor as shown in Figure 1; Every phase current converter is in series by upper brachium pontis and lower brachium pontis.An arbitrary phase current converter midpoint is connected with start-up circuit through ac filter inductance 29; Described three-phase current converter is in parallel, forms positive and negative busbar (as shown in the sign that marks in figure).The present embodiment illustrates mutually with wherein arbitrary: described clamp diode comprises upper brachium pontis clamp diode 27 and lower brachium pontis clamp diode 28; Described upper brachium pontis mid point is connected with upper brachium pontis clamp diode 27 negative electrodes, lower brachium pontis mid point and lower brachium pontis clamp diode 28 anodic bondings, and upper brachium pontis clamp diode 27 anodes are connected with lower brachium pontis clamp diode 28 negative electrodes; After two described Support Capacitors 23 and 24 series connection, be connected in parallel between positive and negative busbar, the mid point of two electric capacity of series connection is connected with the mid point of the clamp diode that often is in series.Wherein go up the IGBT module 25 that brachium pontis comprises at least two cascades, lower brachium pontis comprises the IGBT module 26 of at least two cascades; Described IGBT module comprises antiparallel IGBT and diode.During to the three-level voltage source converter control, its direct current capacitor is used for providing the converter voltage support; The ac filter inductance is used for filtering ac-side current harmonic wave; Clamp diode is used for obtaining three level modulation of ac output voltage; Get and to be used for providing the control power supply to control circuit by power supply; Control circuit is used for realization to control, monitoring and the protection of converter.Need to prove, the IGBT number of modules in three three-level voltage source converter upper and lower bridge arms of the present embodiment can equate also can not wait, and each IGBT module can by etc. quantity I GBT module series connection substitute, the number of IBGT module is positive integer.
All for the soft start of implement device, it includes resistance and switch in parallel to described start-up circuit 5,8 and 14.
The present embodiment HVDC can adopt two ends form or multiterminal form; UPFC can adopt two ends or multiterminal form; Described HVDC holds concurrently in the UPFC system, and the positive and negative busbar of HVDC (being common DC bus) is connected with the positive and negative busbar (being common DC bus) of UPFC (anodal and anodal company the, negative pole and negative pole are even).
Embodiment two
The present embodiment and embodiment one are basic identical, but distinctive points is:
The present embodiment adds respectively transformer 7 and transformer 16 in order to realize the coupling of system voltage and converter voltage in electrical network and current converter 1 and 11, perhaps in current converter 1 and 11 arbitrary one add and all can.As shown in Figure 4, the present embodiment all adds a transformer in current converter 1 and 11, and it is arranged between start-up circuit and described electrical network, described transformer primary side and ground connection in parallel with described electrical network, and its secondary is connected with described start-up circuit.
Should be noted that at last: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit, although with reference to above-described embodiment, the utility model is had been described in detail, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement embodiment of the present utility model, and do not break away from any modification of the utility model spirit and scope or be equal to replacement, it all should be encompassed in the middle of claim scope of the present utility model.
Claims (14)
1. the HVDC based on three-level voltage source converter UPFC system of holding concurrently, comprise current converter (1,2,11), earthed circuit (3,12), switch (4) and DC transmission line (13); It is characterized in that,
Described current converter (1) one end is connected with electrical network, after other end earth circuit (3), be divided at least two branch roads, branch road one is to be connected with described electrical network after earthed circuit (3) the two ends described current converters of connection (2), consists of one group of THE UPFC UPFC; Branch road two is to be connected with electrical network after earthed circuit (3) two ends are connected with described current converter (11) by described DC transmission line (13), consists of one group of flexible DC power transmission HVDC; Earth electric capacity (12) between described DC transmission line (13) and described current converter (11); Described switch (4) is in parallel with described current converter (2).
2. the system as claimed in claim 1, is characterized in that, described current converter (1) comprises converter (6); It is in parallel with electrical network that described converter (6) exchanges end, and its dc terminal is in parallel with described earthed circuit (3).
3. system as claimed in claim 2, is characterized in that, described current converter (1) comprises start-up circuit (5), is arranged between described converter (6) and described electrical network; Described start-up circuit (5) one ends are connected with described electrical network, and the other end is connected with described converter (6).
4. the system as claimed in claim 1, is characterized in that, described current converter (11) comprises converter (15); Described converter (15) AC is connected between power supply and load by transformer (10), its DC side and described earthed circuit (12) parallel connection.
5. system as claimed in claim 4, is characterized in that, described current converter (11) comprises the start-up circuit (14) that is connected between described electrical network and described converter (15).
6. the system as claimed in claim 1, is characterized in that, described current converter (2) comprises transformer (10) and converter (9); The former limit of described transformer (10) is connected between described electrical network and load, and described transformer (10) secondary is connected with described converter (6).
7. system as claimed in claim 6, is characterized in that, described current converter (2) comprises the start-up circuit (8) that is connected between described transformer (10) secondary and described converter (9).
8. the system as claimed in claim 1, is characterized in that, described earthed circuit (3,12) is ground capacity, the neutral ground of described ground capacity.
9. the system as claimed in claim 1, is characterized in that, described earthed circuit (3,12) is earth resistance, the neutral ground of described earth resistance.
10. described system as arbitrary in claim 1-7, is characterized in that, described converter (6,9,15) comprises three-phase current converter, filter inductance, clamp diode, Support Capacitor; Every phase current converter is in series by upper brachium pontis and lower brachium pontis; Described every phase current converter midpoint is connected with start-up circuit through the ac filter inductance; Described three-phase current converter is in parallel, forms positive and negative busbar;
Described clamp diode comprises brachium pontis clamp diode and lower brachium pontis clamp diode; In described every phase current converter, described upper brachium pontis mid point is connected with upper brachium pontis clamp diode negative electrode, lower brachium pontis mid point and lower brachium pontis clamp diode anodic bonding, and upper brachium pontis clamp diode anode is connected with lower brachium pontis clamp diode negative electrode;
After two described Support Capacitor series connection, be connected in parallel between positive and negative busbar, the mid point of two electric capacity of series connection is connected with the mid point of the clamp diode that often is in series.
11. system as claimed in claim 10 is characterized in that, described upper brachium pontis and described lower brachium pontis include the IGBT module of at least two cascades; Described IGBT module comprises antiparallel IGBT and diode.
12. described system as arbitrary in claim 1-7 is characterized in that, described converter (6,9,15) all adopts three level topological structures.
13. as claim 3,5 or 7 arbitrary described systems, it is characterized in that, described start-up circuit (5,8,14) comprises resistance and switch in parallel.
14. the system as claimed in claim 1 is characterized in that, described flexible DC power transmission HVDC adopts two ends form or multiterminal form; Described THE UPFC UPFC adopts two ends or multiterminal form; Described HVDC holds concurrently in the UPFC system, and the positive and negative busbar of HVDC is connected with the positive and negative busbar of UPFC.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220374951 CN202949235U (en) | 2012-07-13 | 2012-07-13 | Three-level voltage source converter-based HVDC-UPFC system |
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| CN 201220374951 CN202949235U (en) | 2012-07-13 | 2012-07-13 | Three-level voltage source converter-based HVDC-UPFC system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104348167A (en) * | 2013-07-26 | 2015-02-11 | 南京南瑞继保电气有限公司 | Static synchronous series compensator start method |
| CN105978134A (en) * | 2016-06-22 | 2016-09-28 | 清华大学 | Uninterrupted electric power exchanger used for alternating current power distribution system |
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2012
- 2012-07-13 CN CN 201220374951 patent/CN202949235U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104348167A (en) * | 2013-07-26 | 2015-02-11 | 南京南瑞继保电气有限公司 | Static synchronous series compensator start method |
| CN105978134A (en) * | 2016-06-22 | 2016-09-28 | 清华大学 | Uninterrupted electric power exchanger used for alternating current power distribution system |
| CN105978134B (en) * | 2016-06-22 | 2018-10-19 | 清华大学 | A kind of uninterrupted power exchanger for alternating-current system |
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