CN203166539U - HVDC and UPFC system based on modularized multilevel converter - Google Patents

HVDC and UPFC system based on modularized multilevel converter Download PDF

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Publication number
CN203166539U
CN203166539U CN 201220695679 CN201220695679U CN203166539U CN 203166539 U CN203166539 U CN 203166539U CN 201220695679 CN201220695679 CN 201220695679 CN 201220695679 U CN201220695679 U CN 201220695679U CN 203166539 U CN203166539 U CN 203166539U
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CN
China
Prior art keywords
circuit
converter
brachium pontis
submodule
reactor
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Expired - Fee Related
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CN 201220695679
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Chinese (zh)
Inventor
王轩
赵刚
刘慧文
闫殳裔
宋晓通
刘隽
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State Grid Corp of China SGCC
Shanghai Municipal Electric Power Co
China EPRI Science and Technology Co Ltd
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State Grid Corp of China SGCC
Shanghai Municipal Electric Power Co
China EPRI Science and Technology Co Ltd
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Priority to CN201220374909.X priority
Application filed by State Grid Corp of China SGCC, Shanghai Municipal Electric Power Co, China EPRI Science and Technology Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN 201220695679 priority patent/CN203166539U/en
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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
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Abstract

The utility model provides a HVDC and UPFC system based on a modularized multilevel converter. The system comprises a first converter device, a second converter device, a third converter device, a first grounding circuit, a second grounding circuit and a direct current transmission line. The first converter device and the second converter device form a UPFC. The first converter device and the third converter device form a HVDC. According to the utility model, the HVDC and the UPFC share one converter device so that engineering construction cost and an investment are saved; a utilization rate of equipment is increased; concentration management and control are convenient. The converter device adopts a modularized multilevel converter topology structure. A technological difficulty of series connection of the device is avoided. Phase-splitting control is convenient and a modularized design is possessed. Through a redundancy technology, a fault unit can be bypassed and reliability of apparatus operation is increased. A device switch frequency is low and apparatus operation losses are small.

Description

A kind of HVDC based on modularization multi-level converter UPFC system of holding concurrently
Technical field
The utility model relates to field of power electronics, is specifically related to a kind of HVDC based on modularization multi-level converter UPFC system of holding concurrently.
Background technology
Develop rapidly under the new situation in distributed power generation, regenerative resource, intelligent grid technology, the flexible DC power transmission technology provides new approach for the deficiency that remedies conventional high-tension direct current transportation technology.The high voltage direct current transmission of traditional employing half control device thyristor, exchanging side 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 electricity is sent in a difficult problem from traditional direct current transportation to passive load point; 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 constitutes 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 electricity is sent in a difficult problem from traditional direct current transportation to passive load point; 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 interchange side is direct or in parallel with system by transformer, DC side connects power transmission line, after arriving the transmission of electricity destination, another converter exchanges side directly or is 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, just can distinguish or realizes several different functions such as shunt compensation, series compensation and phase shift simultaneously.The UPFC device can be regarded as a STATCOM (STATCOM) device and constitutes 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 make UPFC have 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 based on the MMC structure (VSC) DC side parallel, wherein a converter interchange side is direct or in parallel with system by transformer, and another converter exchanges side and connects with system by transformer.Owing to adopted turn-off device control, made the output voltage of parallel inverter and polyphone converter to control separately.Each converter can both independently absorb or supply with reactive power and active power at ac output end.
Among flexible DC power transmission and the UPFC, voltage source converter (VSC) adopts two level or three level structures usually.Among big capacity flexible DC power transmission and the UPFC, the mode that VSC need take to turn-off 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 mainly show: be subjected to the influence 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 bigger.These have limited the application of big capacity flexible DC power transmission and UPFC.
Modularization multi-level converter (MMC) is a kind of novel topological structure that adopts a plurality of submodule series connection, and its each phase brachium pontis is divided into brachium pontis and following brachium pontis, and upper and lower bridge arm is followed in series to form by N identical submodule and AC reactor respectively.The half-bridge structure that each submodule is made up of two insulated gate bipolar transistors (IGBT) and inverse parallel diode thereof constitutes with electric capacity in parallel.Each submodule is a two terminal device, and it can be simultaneously in the switching of carrying out under the situation of two kinds of senses of current between full module voltage and zero module voltage.MMC has avoided the technological difficulties of device series connection, and output waveform is many level, effectively reduces physical switch frequency and the switching loss of switching device; The peculiar modular construction of MMC makes its flexible design, is beneficial to batch process; Be convenient to phase-splitting control and modularized design, but by redundant technique bypass trouble unit, and then improve the device operational reliability; The devices switch frequency is lower, and the device running wastage is less.
Based on above characteristics, modularization multi-level converter extremely is adapted at using in flexible DC power transmission system and the THE UPFC (UPFC), and the advantage in high-power is used is particularly evident, will be one of main flow topology of multi-level converter of future generation.
Problems such as in the common actual engineering, flexible DC power transmission device and UPFC independently build with operation often, and this has caused, and overlapping investment construction, cost height, utilization rate of equipment and installations are low, management and control are concentrated.
The utility model content
At the deficiencies in the prior art, the utility model provides a kind of flexible DC power transmission HVDC based on modularization multi-level converter the THE UPFC UPFC system of holding concurrently, utilize voltage source converter direct voltage polarity constant, the convenient characteristics that constitute the direct current multi-terminal system, flexible DC power transmission and UPFC share a current converter, save engineering construction cost and investment, improved usage ratio of equipment, be convenient to centralized management and control.
A kind of HVDC based on modularization multi-level converter that the utility model provides UPFC system of holding concurrently comprises first current converter 1, second current converter 2, the 3rd current converter 11, first earthed circuit 3, second earthed circuit 12 and DC transmission line 13; Its improvements are,
Described first current converter, 1 one ends link to each other with electrical network, the other end is drawn positive and negative busbar, behind described positive and negative busbar first earthed circuit 3 in parallel, be divided at least two branch roads, branch road one is to be connected with described electrical network after first earthed circuit, 3 two ends connect described second current converter 2, constitutes one group of THE UPFC UPFC; Branch road two is to be connected with electrical network after first earthed circuit, 3 two ends are connected with described the 3rd current converter 11 by described DC transmission line 13, constitutes one group of flexible DC power transmission HVDC; Second earthed circuit 12 in parallel between described DC transmission line 13 and described the 3rd current converter 11.
Wherein, described first current converter 1 comprises first start-up circuit 5 and first converter 6; Described first start-up circuit 5 is connected between described electrical network and described first converter 6; Described first converter 6 is in parallel with described first earthed circuit 3.
Wherein, described the 3rd current converter 11 comprises the 3rd start-up circuit 14 and the 3rd converter 15; Described the 3rd start-up circuit 14 is connected between electrical network and described the 3rd converter 15.
Wherein, described second current converter 2 comprises transformer 10, second start-up circuit 8 and second converter 9; Described transformer 10 former limits are connected between described electrical network and the load, and described transformer 10 secondary are connected with described first start-up circuit 5 and described first converter 6 successively.
Wherein, described first earthed circuit 3 and described second earthed circuit 12 are ground capacity or earth resistance; The neutral ground of described ground capacity; The neutral ground of described earth resistance.
Wherein, when described first earthed circuit 3 and described second earthed circuit 12 are described ground capacity, described converter 6 by 3 mutually six brachium pontis constitute, each brachium pontis comprises 1 reactor and Q the submodule that structure is identical; An end is connected with described first start-up circuit 5 by reactor after the submodule cascade of each brachium pontis; Submodule one end of the cascade of two brachium pontis of the other end and other is connected.
Wherein, when described first earthed circuit is 3 and described second earthed circuit 12 when being described ground capacity, described converter 9 by 3 mutually six brachium pontis constitute, each brachium pontis comprises 1 reactor and W the submodule that structure is identical; An end is connected with described second start-up circuit 8 by reactor after the submodule cascade of each brachium pontis; Submodule one end of the cascade of two brachium pontis of the other end and other is connected.
Wherein, when described first earthed circuit 3 and described second earthed circuit 12 are described ground capacity, described converter 15 by 3 mutually six brachium pontis constitute, each brachium pontis comprises 1 reactor and R the submodule that structure is identical; An end is connected with described the 3rd start-up circuit 14 by reactor after the submodule cascade of each brachium pontis; Submodule one end of the cascade of two brachium pontis of the other end and other is connected.
Wherein, when described first earthed circuit 3 and described second earthed circuit 12 are described earth resistance, described converter 6 by 3 mutually six brachium pontis constitute, each brachium pontis comprises 1 reactor and N the submodule that structure is identical; An end is connected with described first start-up circuit 5 after the submodule cascade of each brachium pontis, is connected with other reactor of two brachium pontis behind the other end series reactor.
Wherein, when described first earthed circuit 3 and described second earthed circuit 12 are described earth resistance, described converter 9 by 3 mutually six brachium pontis constitute, each brachium pontis comprises 1 reactor and M the submodule that structure is identical; An end is connected with described second start-up circuit 8 after the submodule cascade of each brachium pontis, is connected with other reactor of two brachium pontis behind the other end series reactor.
Wherein, when described first earthed circuit 3 and described second earthed circuit 12 are described earth resistance, described converter 15 by 3 mutually six brachium pontis constitute, each brachium pontis comprises 1 reactor and P the submodule that structure is identical; An end is connected with described the 3rd start-up circuit 14 after the submodule cascade of each brachium pontis, is connected with other reactor of two brachium pontis behind the other end series reactor.
Wherein, described submodule constitutes 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, described first start-up circuit 5, described second start-up circuit 8 and described the 3rd start-up circuit 14 include parallel resistor and switch.
Wherein, described flexible DC power transmission HVDC can adopt two ends form or multiterminal form; Described THE UPFC 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) links to each other 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 can significantly improve installed capacity, need not to adopt the technology of complicated IGBT device series connection;
The utility model can be realized phase-splitting control;
The utility model can be realized modularized design;
But the utility model improves the device operational reliability by redundant technique bypass trouble unit;
For reducing output harmonic wave, IGBT device tandem plan switching frequency is higher usually, and the device loss is bigger; This programme has adopted the modular multilevel technology, and the switching frequency of each device is lower, but can realize that external equivalent switching frequency is very high, reduces output harmonic wave, and it is less therefore to install running wastage;
The utility model flexible DC power transmission and UPFC share a current converter, have saved engineering construction cost and investment, have improved usage ratio of equipment, are convenient to centralized management and control.
Description of drawings
The modularization multi-level converter MMC topology diagram (scheme one) that Fig. 1 provides for the utility model.
The modularization multi-level converter MMC topology diagram (scheme two) that Fig. 2 provides for the utility model.
The topological diagram (scheme one) that the flexible DC power transmission HVDC based on modularization multi-level converter MMC that Fig. 3 provides for the utility model holds concurrently THE UPFC UPFC.
The topological diagram (scheme two) that the flexible DC power transmission HVDC based on modularization multi-level converter MMC that Fig. 4 provides for the utility model holds concurrently THE UPFC UPFC.
The single submodular circuits figure that Fig. 5 provides for the utility model.
The modularization multi-level converter MMC topology diagram (scheme three) that Fig. 6 provides for the utility model.
The modularization multi-level converter MMC topology diagram (scheme three) that Fig. 7 provides for the utility model.
Wherein, (1) is current converter; (2) be current converter; (3) be ground capacity or earth resistance in the 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.
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 modularization multi-level converter that present embodiment provides UPFC system of holding concurrently, its topological diagram comprises first current converter 1, second current converter 2, the 3rd current converter 11, first earthed circuit 3, second earthed circuit 12 and DC transmission line 13 as shown in Figure 3;
Described first current converter, 1 one ends are connected with electrical network, and the other end is in parallel with first earthed circuit 3; First earthed circuit, 3 two ends are divided at least two branch roads, and branch road one connects described second current converter 2 backs and is connected with described electrical network, constitutes one group of THE UPFC UPFC; Branch road two is connected the back by described DC transmission line 13 and is connected with electrical network with described the 3rd current converter 11, constitute one group of flexible DC power transmission HVDC; Second ground capacity 12 in parallel between described DC transmission line 13 and described the 3rd current converter 11.
Wherein, each device is constructed as follows:
All for the soft start of implement device, it comprises parallel resistor and switch for described first start-up circuit 5, second start-up circuit 8, the 3rd start-up circuit 14.
Described first current converter 1 comprises that first start-up circuit 5 and the first converter 6(, first converter 6 are cascade half-bridge structure voltage source converter, for flexible DC power transmission and THE UPFC shared); Described first start-up circuit, 5 one terminations are gone into electrical network, the other end and 6 series connection of described first converter.
Described the 3rd current converter 11 comprises the 3rd start-up circuit 14 and the 3rd converter 15; Described the 3rd start-up circuit 14 1 ends are connected with electrical network, the other end and 15 series connection of described the 3rd converter.
Described second current converter 2 comprises transformer 10, second start-up circuit 8 and second converter 9; Described transformer 10 former limit series connection insert described electrical network, and described transformer 10 secondary are connected with described first start-up circuit 5 and described first converter 6 successively; Described transformer 10 former limits are connected with load.
The positive and negative busbar of first converter 6 and second converter 9 links to each other, and first earthed circuit 3 in parallel between the positive and negative busbar constitutes the intermediate dc link and links to each other, and active power can be carried out bi-directional between two current converters like this; Reactive power can exchange side at it by each current converter and exchange with system independently.
Described first earthed circuit 3 and second earthed circuit 12---flexible DC power transmission and THE UPFC shares, and it is ground capacity or earth resistance, 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.
When described first earthed circuit 3 and second earthed circuit 12 were described ground capacity: described converter 6 as shown in Figure 1, constituted by six brachium pontis of 3 phases, each brachium pontis comprises 1 reactor and Q the submodule that structure is identical, an end is connected with described first start-up circuit 5 by reactor after the submodule cascade of each brachium pontis, and submodule one end of the cascade of two brachium pontis of the other end and other is connected and draws direct current positive and negative busbar (shown in the sign that marks among the figure); Described second converter, 9 structures are identical with structure shown in Figure 1, constituted by six brachium pontis of 3 phases, each brachium pontis comprises 1 reactor and W the submodule that structure is identical, an end is connected with described first start-up circuit 5 by reactor after the submodule cascade of each brachium pontis, and submodule one end of the cascade of two brachium pontis of the other end and other is connected and draws the direct current positive and negative busbar; Described the 3rd converter 15 structures are identical with structure shown in Figure 1, are made of six brachium pontis of 3 phases, and each brachium pontis comprises 1 reactor and R the submodule that structure is identical; An end is connected with described first start-up circuit 5 by reactor after the submodule cascade of each brachium pontis; Submodule one end of the cascade of two brachium pontis of the other end and other is connected and draws the direct current positive and negative busbar.Above-mentioned reactance is used for suppressing the convertor assembly output harmonic wave.Wherein, Q, W and R are positive integer, and the number of Q, W and R can equate, also can not wait.When described first earthed circuit 3 and second earthed circuit 12 were described earth resistance: described first converter 6 as shown in Figure 2, constituted by six brachium pontis of 3 phases, each brachium pontis comprises 1 reactor and N the submodule that structure is identical, an end is connected with described first start-up circuit 5 after the submodule cascade of each brachium pontis, is connected with the reactor of other two brachium pontis behind the other end series reactor and draws direct current positive and negative busbar (shown in the sign that marks among the figure); Described second converter, 9 structures are identical with structure shown in Figure 2, constituted by six brachium pontis of 3 phases, each brachium pontis comprises 1 reactor and M the submodule that structure is identical, an end is connected with described first start-up circuit 5 after the submodule cascade of each brachium pontis, is connected with the reactor of other two brachium pontis behind the other end series reactor and draws the direct current positive and negative busbar; Described the 3rd converter 15 structures are identical with structure shown in Figure 2, constituted by six brachium pontis of 3 phases, each brachium pontis comprises 1 reactor and P the submodule that structure is identical, an end is connected with described first start-up circuit 5 after the submodule cascade of each brachium pontis, is connected with the reactor of other two brachium pontis behind the other end series reactor and draws the direct current positive and negative busbar.Above-mentioned reactance be used for to suppress thunder and lightning, operation ripple from system to the infringement of equipment.Wherein, N, M and P are positive integer, and the number of N, M and P can equate, also can not wait.
Above-mentioned its circuit diagram of described submodule constitutes by half-bridge structure is in parallel with dc capacitor as shown in Figure 5, 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; The submodule half-bridge is used for the output required voltage; Its direct current capacitor is used for providing submodule voltage to support; During the submodule internal fault, its bypass circuit is used for making submodule out of service, realizes STATCOM(current conversion station 1) the device redundancey operation; Described dc capacitor by get can power supply for the control circuit of submodule provides power supply, control circuit is used for realizing control, monitoring and the protection to submodule.
Described flexible DC power transmission HVDC can adopt two ends form or multiterminal form; Described THE UPFC UPFC can adopt two ends or multiterminal form; Described HVDC holds concurrently in the UPFC system, the positive and negative busbar of HVDC (being common DC bus) link to each other with the positive and negative busbar (being common DC bus) of UPFC (positive pole connects positive pole, and negative pole connects negative pole).
Embodiment two
Present embodiment and embodiment one are basic identical, but distinctive points is:
Present embodiment for the access of controlling second current converter 2 with withdraw from, present embodiment is by-pass switch 4 in parallel at transformer 10 two ends, as shown in Figure 6.
Embodiment three
Present embodiment and embodiment one and embodiment two are basic identical, but distinctive points is:
Present embodiment is in order to realize the coupling of system voltage and converter voltage, add transformer 7 and transformer 16 respectively in electrical network and first current converter 1 and the 3rd current converter 11, perhaps an arbitrary adding all can in first current converter 1 and the 3rd current converter 11.As shown in Figure 7, present embodiment all adds a transformer in first current converter 1 and the 3rd current converter 11, and it is arranged between start-up circuit and the described electrical network, the former limit of described transformer 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 make amendment 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 the claim scope of the present utility model.

Claims (14)

1. the HVDC based on modularization multi-level converter UPFC system of holding concurrently comprises first current converter (1), second current converter (2), the 3rd current converter (11), first earthed circuit (3), second earthed circuit (12) and DC transmission line (13); It is characterized in that,
Described first current converter (1) one end links to each other with electrical network, the other end is drawn positive and negative busbar, behind described positive and negative busbar first earthed circuit in parallel (3), be divided at least two branch roads, branch road one is to be connected with described electrical network after first earthed circuit (3) two ends connect described second current converter (2), constitutes one group of THE UPFC UPFC; Branch road two is to be connected with electrical network after first earthed circuit (3) two ends are connected with described the 3rd current converter (11) by described DC transmission line (13), constitutes one group of flexible DC power transmission HVDC; Second earthed circuit in parallel (12) between described DC transmission line (13) and described the 3rd current converter (11).
2. the system as claimed in claim 1 is characterized in that, described first current converter (1) comprises first start-up circuit (5) and first converter (6); Described first start-up circuit (5) is connected between described electrical network and described first converter (6); Described first converter (6) is in parallel with described first earthed circuit (3).
3. the system as claimed in claim 1 is characterized in that, described the 3rd current converter (11) comprises the 3rd start-up circuit (14) and the 3rd converter (15); Described the 3rd start-up circuit (14) is connected between electrical network and described the 3rd converter (15).
4. the system as claimed in claim 1 is characterized in that, described second current converter (2) comprises transformer (10), second start-up circuit (8) and second converter (9); The former limit of described transformer (10) is connected between described electrical network and the load, and described transformer (10) secondary is connected with described first start-up circuit (5) and described first converter (6) successively.
5. the system as claimed in claim 1 is characterized in that, described first earthed circuit and described second earthed circuit (12) are ground capacity or earth resistance; The neutral ground of described ground capacity; The neutral ground of described earth resistance.
6. system as claimed in claim 5, it is characterized in that, when described first earthed circuit (3) and described earthed circuit (12) when being described ground capacity, described first converter (6) by 3 mutually six brachium pontis constitute, each brachium pontis comprises 1 reactor and Q the submodule that structure is identical; An end is connected with described first start-up circuit (5) by reactor after the submodule cascade of each brachium pontis; Submodule one end of the cascade of two brachium pontis of the other end and other is connected.
7. system as claimed in claim 5, it is characterized in that, when described first earthed circuit (3) and described second earthed circuit (12) when being described ground capacity, described second converter (9) is made of six brachium pontis of 3 phases, and each brachium pontis comprises 1 reactor and W the submodule that structure is identical; An end is connected with described second start-up circuit (8) by reactor after the submodule cascade of each brachium pontis; Submodule one end of the cascade of two brachium pontis of the other end and other is connected.
8. system as claimed in claim 5, it is characterized in that, when described first earthed circuit (3) and second earthed circuit (12) when being described ground capacity, described the 3rd converter (15) is made of six brachium pontis of 3 phases, and each brachium pontis comprises 1 reactor and R the submodule that structure is identical; An end is connected with described the 3rd start-up circuit (14) by reactor after the submodule cascade of each brachium pontis; Submodule one end of the cascade of two brachium pontis of the other end and other is connected.
9. system as claimed in claim 5, it is characterized in that, when described first earthed circuit (3) and described second earthed circuit (12) when being described earth resistance, described first converter (6) is made of six brachium pontis of 3 phases, and each brachium pontis comprises 1 reactor and N the submodule that structure is identical; An end is connected with described first start-up circuit (5) after the submodule cascade of each brachium pontis, is connected with other reactor of two brachium pontis behind the other end series reactor.
10. system as claimed in claim 5, it is characterized in that, when described first earthed circuit (3) and described second earthed circuit (12) when being described earth resistance, described second converter (9) is made of six brachium pontis of 3 phases, and each brachium pontis comprises 1 reactor and M the submodule that structure is identical; An end is connected with described second start-up circuit (8) after the submodule cascade of each brachium pontis, is connected with other reactor of two brachium pontis behind the other end series reactor.
11. system as claimed in claim 5, it is characterized in that, when described first earthed circuit (3) and described second earthed circuit (12) when being described earth resistance, described the 3rd converter (15) is made of six brachium pontis of 3 phases, and each brachium pontis comprises 1 reactor and P the submodule that structure is identical; An end is connected with described the 3rd start-up circuit (14) after the submodule cascade of each brachium pontis, is connected with other reactor of two brachium pontis behind the other end series reactor.
12., it is characterized in that described submodule constitutes by half-bridge structure is in parallel with dc capacitor as the arbitrary described system of claim 6-11, described half-bridge structure comprises the IGBT module of two series connection, 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.
13., it is characterized in that described first start-up circuit (5), described second start-up circuit (8) and described the 3rd start-up circuit (14) include parallel resistor and switch as the arbitrary described system of claim 2-4.
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 links to each other with the positive and negative busbar of UPFC.
CN 201220695679 2012-07-13 2012-12-14 HVDC and UPFC system based on modularized multilevel converter Expired - Fee Related CN203166539U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103606911A (en) * 2013-10-12 2014-02-26 张家港智能电力研究院有限公司 Method for removing instantaneous short circuit earth faults of direct current line of flexible direct current power transmission system
CN104065061A (en) * 2014-06-23 2014-09-24 许继电气股份有限公司 STATCOM start modulation control method
CN110492740A (en) * 2019-08-28 2019-11-22 国网江苏省电力有限公司 A kind of the decompression self-energizing circuit and method of mesohigh DC distribution net

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103606911A (en) * 2013-10-12 2014-02-26 张家港智能电力研究院有限公司 Method for removing instantaneous short circuit earth faults of direct current line of flexible direct current power transmission system
CN103606911B (en) * 2013-10-12 2016-05-25 张家港智能电力研究院有限公司 A kind of method of excising flexible DC power transmission system DC line instantaneity short circuit grounding fault
CN104065061A (en) * 2014-06-23 2014-09-24 许继电气股份有限公司 STATCOM start modulation control method
CN110492740A (en) * 2019-08-28 2019-11-22 国网江苏省电力有限公司 A kind of the decompression self-energizing circuit and method of mesohigh DC distribution net

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