CN202068184U - Cascade converter station and cascade multi-terminal HVDC system - Google Patents

Cascade converter station and cascade multi-terminal HVDC system Download PDF

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Publication number
CN202068184U
CN202068184U CN 201020649760 CN201020649760U CN202068184U CN 202068184 U CN202068184 U CN 202068184U CN 201020649760 CN201020649760 CN 201020649760 CN 201020649760 U CN201020649760 U CN 201020649760U CN 202068184 U CN202068184 U CN 202068184U
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China
Prior art keywords
current conversion
conversion station
converter
station
coupled
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CN 201020649760
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Chinese (zh)
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孙昕
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State Grid Corp of China SGCC
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State Grid Corp of China SGCC
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Priority to CN 201020649760 priority Critical patent/CN202068184U/en
Priority to DE201120102535 priority patent/DE202011102535U1/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

The utility model discloses a cascade converter station, including a low-voltage end converter station, wherein every pole includes a converter transformer coupled to a first AC electrical network, a converter valve coupled to the converter transformer, a flat wave reactor and a high-voltage end converter station. The high-voltage end converter station is connected with the low-voltage end converter station in series through an MVDC, and is connected to the HVDC, wherein every pole of the high-voltage end converter station includes a converter transformer coupled to a second AC electrical network, a converter valve coupled to the converter transformer, and a flat wave reactor. A ground electrode circuit and a metal return wire are provided in the low-voltage end converter station. A ground electrode circuit and a neutral bus switch are further arranged in the high-voltage end converter station. The utility model also discloses a cascade multi-terminal HVDC system composed of cascade converter stations. The utility model can realize HVDC in a flexible, reliable, and economical mode.

Description

Cascade connection converter station and cascade multiterminal HVDC transmission system
Technical field
The utility model relates to the direct current transportation technical field, more specifically, and the cascade multiterminal HVDC transmission system that relates to the cascade connection converter station that is used for the direct current transportation of cascade multi-terminal high-voltage and utilize this cascade connection converter station to constitute.
Background technology
Along with the development of power electronic technology, the particularly development of high-power silicon controlled rectifier manufacturing technology, the direct current transportation technology is more and more used in electric power system.The cascade multiterminal HVDC transmission system is made of current conversion station more than three and DC power transmission line, and a wherein more than current conversion station is as converting plant or Inverter Station operation.Compare with the two ends HVDC (High Voltage Direct Current) transmission system, in occasion described below for example, the cascade multiterminal HVDC transmission system can be with more economically, the flexible way operation: a plurality of power supplys base (for example wind power plant) in the big zone is collected electric power by direct current and is outwards carried; Carry the several load centers of a large amount of electric power to a distant place from energy base; DC line branch midway inserts power supply or load; Several isolated AC system realize the non-networking same period with DC line; To big city or center of industry power supply, in the time of must ac transmission should not being adopted with cable or because of the capacity of short circuit restriction because of limited by the overhead transmission line corridor, utilize direct current transportation several current conversion stations power supplies to these places.
In the cascade multiterminal HVDC transmission system, high voltage direct current equipment for example converter, smoothing reactor, DC filter or the like can break down unavoidably owing to the influence of the AC system of bearing high voltage, big electric current, natural environment and being connected.Under the situation that certain part in system (for example a certain extremely in converter) breaks down, expectation is this part of excision from system reliably, and other parts of system can also continue operation, with the fail safe that guarantees HVDC (High Voltage Direct Current) transmission system and improve its energy availability factor.
The utility model content
The utility model is intended to overcome the problems referred to above, and a kind of technology that can realize high voltage direct current transmission in flexible, reliable, economic mode is provided.
For realizing this purpose,, provide a kind of cascade connection converter station that is used for the direct current transportation of cascade multi-terminal high-voltage according to first aspect of the present utility model, comprise: the low-pressure end current conversion station, comprise side of the positive electrode and negative side, wherein each side comprises: converter transformer is coupled to first AC network; Converter valve is coupled to described converter transformer, is used to realize the ac/dc conversion; With the smoothing reactor that is arranged in described converter valve two ends; And high-pressure side current conversion station, connect with described low-pressure end current conversion station by middle straightening stream transmission line, and be connected to HVDC (High Voltage Direct Current) transmission line, this high-pressure side current conversion station comprises side of the positive electrode and negative side, wherein each side comprises: converter transformer is coupled to second AC network; Converter valve is coupled to described converter transformer, is used to realize the ac/dc conversion; With the smoothing reactor that is arranged in described converter valve two ends; Wherein, in described low-pressure end current conversion station, be provided with the earth electrode circuit that is coupled to earth electrode and be coupled in the metal line of return between the positive and negative polar curve.
According to second aspect of the present utility model, a kind of cascade connection converter station that is used for the direct current transportation of cascade multi-terminal high-voltage is provided, comprising: the low-pressure end current conversion station, comprise side of the positive electrode and negative side, wherein each side comprises: converter transformer is coupled to first AC network; Converter valve is coupled to described converter transformer, is used to realize the ac/dc conversion; With the smoothing reactor that is arranged in described converter valve two ends; And high-pressure side current conversion station, connect with described low-pressure end current conversion station by middle straightening stream transmission line, and be connected to HVDC (High Voltage Direct Current) transmission line, this high-pressure side current conversion station comprises side of the positive electrode and negative side, wherein each side comprises: converter transformer is coupled to second AC network; Converter valve is coupled to described converter transformer, is used to realize the ac/dc conversion; With the smoothing reactor that is arranged in described converter valve two ends; Wherein, in described low-pressure end current conversion station, be provided with the earth electrode circuit that is coupled to earth electrode and be coupled in the metal line of return between the positive and negative polar curve, and in described high-pressure side current conversion station, be provided with the earth electrode circuit that is coupled to earth electrode.
According to the third aspect of the present utility model, a kind of cascade connection converter station that is used for the direct current transportation of cascade multi-terminal high-voltage is provided, comprising: the low-pressure end current conversion station, comprise side of the positive electrode and negative side, wherein each side comprises: converter transformer is coupled to first AC network; Converter valve is coupled to described converter transformer, is used to realize the ac/dc conversion; With the smoothing reactor that is arranged in described converter valve two ends; And high-pressure side current conversion station, connect with described low-pressure end current conversion station by middle straightening stream transmission line, and be connected to HVDC (High Voltage Direct Current) transmission line, this high-pressure side current conversion station comprises side of the positive electrode and negative side, wherein each side comprises: converter transformer is coupled to second AC network; Converter valve is coupled to described converter transformer, is used to realize the ac/dc conversion; With the smoothing reactor that is arranged in described converter valve two ends; Wherein, in described low-pressure end current conversion station, be provided with the earth electrode circuit that is coupled to earth electrode and be coupled in the metal line of return between the positive and negative polar curve, in described high-pressure side current conversion station, be provided with the earth electrode circuit and the neutral bus switch that are coupled to earth electrode.
According to fourth aspect of the present utility model, a kind of cascade connection converter station that is used for the direct current transportation of cascade multi-terminal high-voltage is provided, comprise: the low-pressure end current conversion station, comprise side of the positive electrode and negative side, wherein each side comprises: converter transformer is coupled to first AC network, converter valve, be coupled to described converter transformer, the smoothing reactor that is used to realize the ac/dc conversion and is arranged in described converter valve two ends; And high-pressure side current conversion station, connect with described low-pressure end current conversion station by middle straightening stream transmission line, and be connected to HVDC (High Voltage Direct Current) transmission line, this high-pressure side current conversion station comprises side of the positive electrode and negative side, and wherein each side comprises: converter transformer is coupled to second AC network, converter valve, be coupled to described converter transformer, the smoothing reactor that is used to realize the ac/dc conversion and is arranged in described converter valve two ends; Wherein, in described low-pressure end current conversion station, be provided with the earth electrode circuit that is coupled to earth electrode and be coupled in the metal line of return between the positive and negative polar curve, in described high-pressure side current conversion station, be provided with the earth electrode circuit, neutral bus switch and the neutral bus isolation switch that are coupled to earth electrode, and in described, coupled the passage that the high-pressure side current conversion station is carried out bypass between straightening stream transmission line and the described HVDC (High Voltage Direct Current) transmission line.
According to the 5th aspect of the present utility model, a kind of cascade multiterminal HVDC transmission system is provided, comprise the current conversion station of sending end, the current conversion station of receiving end and the HVDC (High Voltage Direct Current) transmission line between the two, wherein, at least one in the current conversion station of the current conversion station of described sending end and receiving end is by constituting to the described cascade connection converter of fourth aspect station according to top first.
By adopting cascade connection converter of the present utility model station and by its cascade multiterminal HVDC transmission system that constitutes, because the various flexible combination of earth electrode circuit, the metal line of return, neutral bus equipment and isolation switch are provided in the wiring at cascade connection converter station, make other parts of system continue operation under the situation about can certain part in system breaking down, improved the fail safe of HVDC (High Voltage Direct Current) transmission system and improved its energy availability factor.In addition, owing to the two ends that smoothing reactor are arranged on converter valve, can play the effect of lightning protection effectively.
Description of drawings
In order more to be expressly understood above-mentioned feature of the present utility model and advantage, unrestricted mode shows preferred embodiment of the present utility model with example in the accompanying drawings, and wherein same or analogous Reference numeral is represented same or analogous parts.
Fig. 1 shows structure and the wiring schematic diagram according to the cascade connection converter station that is used for the direct current transportation of cascade multi-terminal high-voltage of the utility model first embodiment.
The cascade connection converter that Fig. 2 shows first embodiment stands in the complete bipolar operation wiring mode under the normal operating condition.
Fig. 3 A-3C shows the 3/4 bipolar operation wiring at the cascade connection converter station of first embodiment.
Fig. 4 A and Fig. 4 B show the 1/2 bipolar operation wiring at the cascade connection converter station of first embodiment.
Fig. 5 shows the complete one pole ground return circuit operation wiring at the cascade connection converter station of first embodiment.
Fig. 6 A and Fig. 6 B show the 1/2 one pole ground return circuit operation wiring at the cascade connection converter station of first embodiment.
Fig. 7 shows the complete monopole metallic loop operation wiring at the cascade connection converter station of first embodiment.
Fig. 8 A and Fig. 8 B show the 1/2 monopole metallic loop operation wiring at the cascade connection converter station of first embodiment.
Fig. 9 shows structure and the wiring schematic diagram according to the cascade connection converter station that is used for the direct current transportation of cascade multi-terminal high-voltage of the utility model second embodiment.
The cascade connection converter that Figure 10 shows second embodiment stands in the complete bipolar operation wiring under the normal operating condition.
Figure 11 A-11C shows the 3/4 bipolar operation wiring at the cascade connection converter station of second embodiment.
Figure 12 A and Figure 12 B show the 1/2 bipolar operation wiring at the cascade connection converter station of second embodiment.
Figure 13 shows the complete one pole ground return circuit operation wiring at the cascade connection converter station of second embodiment.
Figure 14 A-14C shows the 1/2 one pole ground return circuit operation wiring at the cascade connection converter station of second embodiment.
Figure 15 shows the complete monopole metallic loop operation wiring at the cascade connection converter station of second embodiment.
Figure 16 A-16C shows the 1/2 monopole metallic loop operation wiring at the cascade connection converter station of second embodiment.
Figure 17 shows first kind of expansion connection plan at the cascade connection converter station of second embodiment.
Figure 18 shows the high-pressure side current conversion station monopole metallic loop operation wiring of first kind of expansion connection plan of second embodiment.
Figure 19 shows second kind of expansion connection plan at the cascade connection converter station of second embodiment.
Figure 20 shows the low-pressure end current conversion station one pole ground return circuit operation wiring of second kind of expansion connection plan of second embodiment.
Figure 21 shows structure and the wiring schematic diagram according to the cascade connection converter station that is used for the direct current transportation of cascade multi-terminal high-voltage of the utility model the 3rd embodiment.
Figure 22 shows the 3/4 bipolar operation wiring at the cascade connection converter station of the 3rd embodiment.
Figure 23 shows the bipolar operation wiring of high-pressure side current conversion station at the cascade connection converter station of the 3rd embodiment.
Figure 24 shows the expansion connection plan at the cascade connection converter station of the 3rd embodiment.
Figure 25 shows structure and the wiring schematic diagram according to the cascade connection converter station that is used for the direct current transportation of cascade multi-terminal high-voltage of the utility model the 4th embodiment.
The cascade connection converter that Figure 26 shows the 4th embodiment stands in the complete bipolar operation wiring mode under the normal operating condition.
Figure 27 A and Figure 27 B show the 3/4 bipolar operation wiring at the cascade connection converter station of the 4th embodiment.
Figure 28 A and Figure 28 B show the 1/2 bipolar operation wiring at the cascade connection converter station of the 4th embodiment.
Figure 29 shows the complete one pole ground return circuit operation wiring at the cascade connection converter station of the 4th embodiment.
Figure 30 A and Figure 30 B show the 1/2 one pole ground return circuit operation wiring at the cascade connection converter station of the 4th embodiment.
Figure 31 shows the complete monopole metallic loop operation wiring at the cascade connection converter station of the 4th embodiment.
Figure 32 A and Figure 32 B show the 1/2 monopole metallic loop operation wiring at the cascade connection converter station of the 4th embodiment.
Figure 33 shows first kind of expansion connection plan at the cascade connection converter station of the 4th embodiment.
Figure 34 shows second kind of expansion connection plan at the cascade connection converter station of the 4th embodiment.
Figure 35 shows a kind of optional DC filter allocation plan.
Figure 36 shows another kind of optionally DC filter allocation plan.
Figure 37 shows another optional DC filter allocation plan.
Figure 38 shows according to cascade multiterminal HVDC transmission system of the present utility model.
Embodiment
Below with reference to the accompanying drawings, preferred embodiment of the present utility model is described in detail.Need to prove that described embodiment only is exemplary and be not to be intended to protection range of the present utility model is limited.
Fig. 1 shows structure and the wiring schematic diagram according to the cascade connection converter station that is used for the direct current transportation of cascade multi-terminal high-voltage of the utility model first embodiment.For the purpose of simplified illustration, Fig. 1 only show HVDC (High Voltage Direct Current) transmission system sending end, be the schematic diagram of rectification side.But it will be appreciated by those skilled in the art that, the receiving end of HVDC (High Voltage Direct Current) transmission system, be that the inversion side can adopt the structure substantially the same with sending end and the mode of connection, only be in the inversion operating mode, and the configuration of filter can be slightly different with the rectification side at inversion side converter.
As shown in Figure 1, the cascade connection converter station according to first embodiment comprises low-pressure end current conversion station 11 and high-pressure side current conversion station 12.These two current conversion stations 11 can be in different geographical position with 12.High-pressure side current conversion station 12 is connected with described low-pressure end current conversion station 11 by middle straightening stream transmission line 13.High-pressure side current conversion station 12 also is connected to HVDC (High Voltage Direct Current) transmission line 14.
Low-pressure end current conversion station 11 is used for the alternating current of first AC power 110 is converted to direct current, and is input to high-pressure side current conversion station 12 by middle straightening stream transmission line 13.High-pressure side current conversion station 12 is converted to direct current with the alternating current of second AC power 120, and it is the direct current of this direct current and 11 outputs of low-pressure end current conversion station is superimposed, producing high voltage direct current, and by HVDC (High Voltage Direct Current) transmission line 14 transfer to HVDC (High Voltage Direct Current) transmission system receiving end, be inversion side (not shown in figure 1).First AC power 110 and second AC power 120 for example can be the wind power plants that is positioned at diverse location.Like this, can realize that collecting electric power from a plurality of AC power in the direct current mode outwards carries.
The voltage range of the high voltage direct current of high-pressure side current conversion station 12 output can be ± more than the 750KV, for example, the voltage of this high voltage direct current can for ± 800KV or ± 1000KV.In this specification will be with the voltage of high voltage direct current ± 800KV is that example describes.In this case, the galvanic voltage range of low-pressure end current conversion station 11 output is preferably half of voltage of high voltage direct current, promptly ± and 400KV.Voltage after 12 pairs second AC power 120 rectifications of high-pressure side current conversion station also is ± 400KV that then the voltage of the high voltage direct current after the two stack is ± 800KV.
The negative side of low-pressure end current conversion station 11 comprises converter transformer 111a, is coupled to first AC power 110.Converter transformer 111a is used to change alternating voltage, and realize exchanging in the transmission system and direct current component between electrical isolation.
Converter valve 112a is coupled to converter transformer 111a, is used to realize the ac/dc conversion.In embodiment of the present utility model, this converter valve 112a preferably uses 12 pulse conversion valves.
A smoothing reactor 115a is respectively arranged at the two ends of converter valve 112a.Smoothing reactor 115a is used for the ripple in the smooth direct current electric current, avoids the interrupted of direct current.Smoothing reactor 115a can also prevent that the steep wave impact that is produced by DC line or DC equipment from entering the valve Room, thereby avoids the infringement of overcurrent to converter valve 112a.By smoothing reactor 115a being arranged on the two ends of converter valve 112a, can also play the effect of lightning protection effectively, thereby increase the fail safe of transmission system.
In this scheme shown in Fig. 1, the two ends of smoothing reactor 115a also cross-over connection DC filter 117a, the harmonic current that is produced when being used for the change of current of filtering converter valve is with the interference that prevents that this harmonic current from causing system.According to a kind of optional scheme, isolation switch can also be installed at DC filter 117a two ends.
Be provided with bypass isolation switch 116a between the smoothing reactor 115a, be used for when converter valve 112a breaks down, carrying out bypass.The next door of converter valve 112a also is provided with bypass alternating-current switch 113a and isolation switch 114a.
The side of the positive electrode of low-pressure end current conversion station 11 has adopted and the negative side symmetrical structure, and comprises converter transformer 111b, converter valve 112b, smoothing reactor 115b, DC filter 117b, bypass isolation switch 116b, bypass alternating-current switch 113b and isolation switch 114b.Because the function of these devices is identical with negative side, no longer is described in greater detail herein.
High-pressure side current conversion station 12 has adopted and low-pressure end current conversion station 11 similar two electrode structures.Particularly, high-pressure side current conversion station 12 comprises: the converter transformer 121a, the 121b that are coupled to second AC power 120; Be coupled to converter valve 122a, the 122b of converter transformer 121a, 121b; Be arranged in smoothing reactor 125a, the 125b at converter valve 122a, 122b two ends; Be connected across DC filter 127a, the 127b at smoothing reactor 125a, 125b two ends; Be arranged on bypass isolation switch 126a, 126b between smoothing reactor 125a, the 125b; And bypass alternating- current switch 123a, 123b and isolation switch 124a, 124b.Because the function of these devices is identical with low-pressure end current conversion station 11, no longer is described in greater detail herein.
Incidentally, in first embodiment shown in Figure 1, the equal cross-over connection in two ends of the smoothing reactor in low-pressure end current conversion station 11 and high-pressure side current conversion station 12 DC filter, this configuration can the elimination system in everywhere harmonic current.But need to prove, in the selection of cascade multiterminal HVDC transmission system connection plan, can reasonably select the allocation plan of DC filter according to the requirement of engineering to equivalent disturbing current.Requiring to adopt the scheme that DC filter is connected across the smoothing reactor two ends under all fronts equivalent disturbing current situation up to standard; On the other hand, allowing equivalence completely to disturb under the principal current situation not up to standard, then can omit DC filter.Also will carry out more specific description hereinafter to the allocation plan of DC filter.
In cascade connection converter station, in low-pressure end current conversion station 11, set up the earth electrode circuit 126 that is coupled to earth electrode and be coupled in the metal line of return 128 between the positive and negative polar curve according to first embodiment.Earth electrode for example can be arranged on low-pressure end current conversion station 11 at a distance of the 40-50km place.In addition, in the wiring of low-pressure end current conversion station 11, be provided with neutral bus switch (NBS) 119a, 119b, neutral bus earthed switch (NBGS) 121, ground return circuit change over switch (GRTS) 120 and metallic(return) circuit change over switch (MRTS) 125.The effect of NBS 119a, 119b is to isolate the utmost point and the normal utmost point that moves that locking will be withdrawed from apace.The effect of NBGS 121 is the temporary grounding net that when earth electrode is out of service under bipolar operational mode neutral bus is forwarded to low-pressure end current conversion station 11.MRTS 125 and GRTS 120 work in coordination, and are implemented in the conversion between one pole ground return circuit and the monopole metallic loop dual mode.
In high-pressure side current conversion station 12, do not set up the earth electrode circuit and the metal line of return that are coupled to earth electrode.
Fig. 2 to Fig. 8 shows 7 kinds of operation wiring modes according to the above-mentioned cascade connection converter station of the utility model first embodiment respectively, that is:
(1) complete bipolar operation wiring;
(2) 3/4 bipolar operation wirings;
(3) 1/2 bipolar operation wirings;
(4) complete one pole ground return circuit wiring;
(5) 1/2 one pole ground return circuit wiring;
(6) complete monopole metallic loop wiring;
(7) 1/2 monopole metallic loop wiring.
In these 7 kinds of operation wiring modes, complete bipolar operation wiring mode is the mode of connection under the normal operating condition, and other various operational modes are the mode of connection under the malfunction.
Referring to Fig. 2, wherein show the complete bipolar operation wiring mode under normal operating condition.The part of having drawn charging operation in the cascade connection converter station with heavy line among the figure. Four converter valve 112a, 112b, 122a, 122b in the positive pole of low-pressure end current conversion station 11 and high-pressure side current conversion station 12 and the negative pole all put into operation.
Fig. 3 A-3C shows 3/4 bipolar operation wiring.This operational mode refers to, and in the positive pole of low-pressure end current conversion station 11 and high-pressure side current conversion station 12 and four converter valve 112a, 112b in the negative pole, 122a, 122b, some converter valve are because fault and out of service, and other three converter valve keep operation.
Fig. 3 A, Fig. 3 B show the converter valve 112a of the low-pressure end operation wiring schematic diagram when out of service.Shown in Fig. 3 A and Fig. 3 B, the bypass channel of the converter valve 112a that withdraws from has two: GRTS and metal line of return loop, perhaps bypass isolation switch loop.When the smoothing reactor 115a of low-pressure end converter valve 112a and DC filter 117a break down, can utilize the GRTS 120 and the metal line of return 128 to carry out bypass.In the case, the converter valve 122a of high-pressure side, 122b still can move.Because all there is dc circuit breaker in these two loops, therefore switches and onlinely to carry out.
Fig. 3 C shows the converter valve 122a of the high-pressure side operation wiring schematic diagram when out of service.Shown in Fig. 3 C, when the converter valve 122a of high-pressure side was out of service, the smoothing reactor 125a at these converter valve two ends still was connected in the operating loop and does not withdraw from.
Fig. 4 A and Fig. 4 B show 1/2 bipolar operation wiring.This operational mode refers to, and a current conversion station in low-pressure end current conversion station 11 and the high-pressure side current conversion station 12 is because fault and out of service, and the positive and negative polarities in another current conversion station keep operation.
Fig. 4 A shows the converter valve 122a of high-pressure side and the 122b operation wiring schematic diagram when out of service.Shown in Fig. 4 A, when the converter valve 122a of high-pressure side and 122b were out of service, the smoothing reactor 125a at these converter valve two ends and 125b still were connected in the operating loop and do not withdraw from.
Fig. 4 B shows the converter valve 112a of low-pressure end and the 112b operation wiring schematic diagram when out of service.Shown in Fig. 4 B, when the converter valve 112b of low-pressure end was out of service, the smoothing reactor 115b at these converter valve two ends still was connected in the operating loop and does not withdraw from.
Fig. 5 shows complete one pole ground return circuit operation wiring.This operational mode refers to, in the positive pole and negative pole of low-pressure end current conversion station 11 and high-pressure side current conversion station 12, the converter valve of one of them utmost point is because fault and out of service, and another converter valve (comprising high-pressure side and low-pressure end) in extremely keeps operation, and constitutes the loop by the earth.The converter valve 122b that the converter valve 112b of anodal low-pressure end and high-pressure side have been shown among Fig. 5 is out of service, and the converter valve 122a of the converter valve 112a of the low-pressure end of negative pole and high-pressure side keeps the situation of operation.
Fig. 6 A and Fig. 6 B show 1/2 one pole ground return circuit operation wiring.This operational mode refers to, in low-pressure end current conversion station 11 and high-pressure side current conversion station 12, converter valve in one of them current conversion station (comprising positive pole and negative pole) is because fault and out of service fully, and the converter valve of having only a utmost point in another current conversion station keeps operation, and constitutes the loop by the earth.
Fig. 6 A shows out of service and the operation wiring schematic diagram when having only the converter valve 112a of negative pole to keep operation in the low-pressure end current conversion station 11 of converter valve 122a in the high-pressure side current conversion station 12 and 122b.As shown in Figure 6A, when the converter valve 122a of high-pressure side was out of service, the smoothing reactor 125a at these converter valve two ends still was connected in the operating loop and does not withdraw from.
Fig. 6 B shows out of service and the operation wiring schematic diagram when having only the converter valve 122a of negative pole to keep operation in the high-pressure side current conversion station 12 of the converter valve 112a of low-pressure end current conversion station 11 and 112b.
Fig. 7 shows complete monopole metallic loop operation wiring.This operational mode refers to, in the positive pole and negative pole of low-pressure end current conversion station 11 and high-pressure side current conversion station 12, the converter valve of one of them utmost point is because fault and out of service, and another converter valve (comprising high-pressure side and low-pressure end) in extremely keeps operation, and constitutes the loop by metallic circuit.The converter valve 122b that the converter valve 112b of anodal low-pressure end and high-pressure side have been shown among Fig. 7 is out of service, and the converter valve 122a of the converter valve 112a of the low-pressure end of negative pole and high-pressure side keeps the situation of operation.
Fig. 8 A and Fig. 8 B show 1/2 monopole metallic loop operation wiring.This operational mode refers to, in low-pressure end current conversion station 11 and high-pressure side current conversion station 12, converter valve in one of them current conversion station (comprising positive pole and negative pole) is because fault and out of service, and the converter valve of having only a utmost point in another current conversion station keeps operation, and constitutes the loop by the metal line of return 128.
Fig. 8 A shows out of service and the operation wiring schematic diagram when having only the converter valve 112a of negative pole to keep operation in the low-pressure end current conversion station 11 of converter valve 122a in the high-pressure side current conversion station 12 and 122b.Shown in Fig. 8 A, when the converter valve 122a of high-pressure side and 122b were out of service, the smoothing reactor 125a at these converter valve two ends and 125b still were connected in the operating loop and do not withdraw from.
Fig. 8 B shows out of service and the operation wiring schematic diagram when having only the converter valve 122a of negative pole to keep operation in the high-pressure side current conversion station 12 of converter valve 112a in the low-pressure end current conversion station 11 and 112b.Shown in Fig. 8 B, when the converter valve 122b of high-pressure side and the converter valve 112a of low-pressure end were out of service, the smoothing reactor 125b at these converter valve two ends and 115a still were connected in the operating loop and do not withdraw from.
The advantage of describing in conjunction with Fig. 1-8 according to the connection plan at the cascade connection converter station of the utility model first embodiment is above: when a converter valve in the low-pressure end current conversion station 11 is stopped transport, can adopt the online bypass of metallic return, also can adopt the online bypass of bypass isolation switch, the flexibility in the control is provided thus.Number of elements in the loop is less, the reliability height.In addition, compare, because the metal line of return 128 is arranged in the low-pressure end current conversion station 11, has reduced the required insulation level of equipment and realized same function with the Xiang Jiaba-Shanghai HVDC (High Voltage Direct Current) transmission system of prior art.
In connection plan according to the cascade connection converter station of first embodiment, if the straightening Flow Line breaks down in the one pole, low pressure current conversion station neutral bus mono-polar devices (equipment such as NBS, isolation switch, CT, PT) breaks down, and can only adopt the operation of one pole ground return circuit.If bipolar medium-voltage line breaks down, then can only bipolarly stop transport.In order to improve the energy availability factor,, provide another kind of cascade connection converter station according to the utility model second embodiment.
Fig. 9 shows structure and the wiring schematic diagram according to the cascade connection converter station that is used for the direct current transportation of cascade multi-terminal high-voltage of the utility model second embodiment.
Compare with first embodiment, in cascade connection converter station, in high pressure station current conversion station 12, set up the earth electrode circuit 133 that is coupled to earth electrode according to second embodiment.In addition, neutral bus isolation switch 137a, 137b have also been increased.
Similar with the situation of first embodiment, Figure 10 to Figure 16 shows 7 kinds of operation wiring modes according to the cascade connection converter station of the utility model the 3rd embodiment respectively, that is:
(1) complete bipolar operation wiring;
(2) 3/4 bipolar operation wirings;
(3) 1/2 bipolar operation wirings;
(4) complete one pole ground return circuit wiring;
(5) 1/2 one pole ground return circuit wiring;
(6) complete monopole metallic loop wiring;
(7) 1/2 monopole metallic loop wiring.
Referring to Figure 10, wherein show the complete bipolar operation wiring mode under normal operating condition.Four converter valve 112a, 112b, 122a, 122b in the positive pole of low-pressure end current conversion station 11 and high-pressure side current conversion station 12 and the negative pole all put into operation.
Figure 11 A-11C shows 3/4 bipolar operation wiring.
Figure 11 A shows the converter valve 122a of the high-pressure side operation wiring schematic diagram when out of service.Shown in Figure 11 A, when the converter valve 122a of high-pressure side was out of service, the smoothing reactor 125a at these converter valve two ends still was connected in the operating loop and does not withdraw from.
Figure 11 B, Figure 11 C show the converter valve 112a of the low-pressure end operation wiring schematic diagram when out of service.Shown in Figure 11 B and Figure 11 C, the bypass channel of the converter valve 112a that withdraws from has two: GRTS and metal line of return loop, perhaps bypass isolation switch loop.When the smoothing reactor 115a of low-pressure end converter valve 112a and DC filter 117a break down, can utilize the GRTS 120 and the metal line of return 128 to carry out bypass.
Figure 12 A and Figure 12 B show 1/2 utmost point operation wiring.
Figure 12 A shows the converter valve 122a of high-pressure side and the 122b operation wiring schematic diagram when out of service.Shown in Figure 12 A, when the converter valve 122a of high-pressure side and 122b were out of service, the smoothing reactor 125a at these converter valve two ends and 125b still were connected in the operating loop and do not withdraw from.
Figure 12 B shows the converter valve 122a of low-pressure end and the 122b operation wiring schematic diagram when out of service.Shown in Figure 12 B, when the converter valve 112a of low-pressure end and 112b were out of service, the smoothing reactor 115a at these converter valve two ends and 115b still were connected in the operating loop and do not withdraw from.
Figure 13 shows complete one pole ground return circuit operation wiring.The converter valve 122b that wherein shows the converter valve 112b of anodal low-pressure end and high-pressure side is out of service, and the converter valve 122a of the converter valve 112a of the low-pressure end of negative pole and high-pressure side keeps the situation of operation.
Figure 14 A-14C shows 1/2 one pole ground return circuit operation wiring.
Figure 14 A shows out of service and the operation wiring schematic diagram when having only the converter valve 112a of negative pole to keep operation in the low-pressure end current conversion station 11 of converter valve 122a in the high-pressure side current conversion station 12 and 122b.Shown in Figure 14 A, when the converter valve 122a of high-pressure side was out of service, the smoothing reactor 125a at these converter valve two ends still was connected in the operating loop and does not withdraw from.
Figure 14 B, Figure 14 C show out of service and the operation wiring schematic diagram when having only the converter valve 122a of negative pole to keep operation in the high-pressure side current conversion station 12 of the converter valve 112a of low-pressure end current conversion station 11 and 112b.
Figure 15 shows complete monopole metallic loop operation wiring, the converter valve 122b that wherein shows the converter valve 112b of anodal low-pressure end and high-pressure side is out of service, and the converter valve 122a of the converter valve 112a of the low-pressure end of negative pole and high-pressure side keeps the situation of operation.
Figure 16 A-16C shows 1/2 monopole metallic loop operation wiring.
Figure 16 A shows out of service and the operation wiring schematic diagram when having only the converter valve 112a of negative pole to keep operation in the low-pressure end current conversion station 11 of converter valve 122a in the high-pressure side current conversion station 12 and 122b.Shown in Figure 16 A, the converter valve 122a of high-pressure side, when 122b is out of service, smoothing reactor 125a, the 125b at these converter valve two ends still are connected in the operating loop and do not withdraw from.
Figure 16 B, 16C show out of service and the operation wiring schematic diagram when having only the converter valve 122a of negative pole to keep operation in the high-pressure side current conversion station 12 of converter valve 112a in the low-pressure end current conversion station 11 and 112b.Shown in Figure 16 B and Figure 16 C, when the converter valve 122b of high-pressure side was out of service, the smoothing reactor 125b at these converter valve two ends still was connected in the operating loop and does not withdraw from.
Energy availability factor according to the cascade connection converter station of second embodiment is higher than first embodiment.In the middle of the line ball road is bipolar breaks down or the neutral bus bipolar devices (equipment such as NBS, NBGS, isolation switch) of low-pressure end current conversion station breaks down, low-pressure end current conversion station 11 is out of service, and high-pressure side current conversion station 12 can adopt one pole metallic return or the big earthed return operation of one pole.
On the basis of the connection plan at the cascade connection converter station of second embodiment, can also expand other connection plans according to the specific requirement of engineering.
Figure 17 shows first kind of expansion connection plan on the second embodiment basis, has wherein increased the metal line of return 138 in high-pressure side current conversion station 12.When high-pressure side current conversion station 12 one pole metallic returns move, can be without the smoothing reactor 125b and the DC filter 127b of another utmost point in missing the stop, as shown in figure 18.
Figure 19 shows second kind of expansion connection plan on the second embodiment basis, has wherein increased converter bypass channel 139a and 139b at high-pressure side current conversion station 12.When the smoothing reactor of high-pressure side current conversion station 12 or DC filter broke down, low-pressure end current conversion station 11 still can move, and as shown in figure 20, wherein shows low-pressure end current conversion station 11 one pole ground return circuit operation wirings.
In first embodiment, when bipolar operation or the operation of one pole ground return circuit, if the smoothing reactor of one pole, DC filter, bypass isolation switch break down in the low-pressure end current conversion station 11, but off-line adopts the metal line of return and GRTS bypass, but break down (N-1 faults) such as middle pressure 400kV DC power transmission line one pole fault or one pole neutral bus equipment NBS, CT, PT, isolation switchs then needs to stop transport one pole, and can not realize the DC bipolar operation.For further improving the energy availability factor,, provide another kind of cascade connection converter station according to the utility model the 3rd embodiment.
Figure 21 shows structure and the wiring schematic diagram according to the cascade connection converter station that is used for the direct current transportation of cascade multi-terminal high-voltage of the utility model the 3rd embodiment.
Compare with second embodiment, increase on the basis of neutral bus isolation switch, set up 2 NBS circuit breaker 140a, 140b and 2 again neutral bus isolation switch 141a, 141b at high-pressure side current conversion station 12.
Adopt the connection plan of the 3rd embodiment, make the N-1 fault is taking place, during faults such as promptly middle pressure 400kV DC line one pole fault or one pole neutral bus equipment NBS, CT, PT, isolation switch, 3/4 bipolar operation still can be realized in this cascade connection converter station, as shown in figure 22.
The N-2 fault is taking place, and promptly when bipolar fault of medium-voltage line or low pressure current conversion station 11 interruption maintenances, high-pressure side current conversion station 12 can adopt bipolar operation, one pole metallic return, the big earthed return operation of one pole, has improved the energy availability factor of system.Because the neutral bus loop of high-pressure side current conversion station 12 is equipped with NBS 140a, 140b, when 11 maintenance of low-pressure end current conversion station, the 12 bipolar operations of high-pressure side current conversion station, it is bipolar to stop transport when the one pole fault takes place, and as shown in figure 23, wherein shows the bipolar operation wiring of high-pressure side current conversion station 12.
On the basis of the connection plan of the 3rd embodiment, if realize high-pressure side current conversion station 12 online carry out between the big earthed return of one pole and the one pole metallic return switching, move without the independent metal line of return of another converter, and adopt the current conversion station temporary grounding to carry out bipolar operation, can adopt the expansion connection plan of Figure 24, wherein in high-pressure side current conversion station 12, increased the metal line of return 138, and MRTB 143, GRTS 142, NGBS 144.
Figure 25 shows structure and the wiring schematic diagram according to the cascade connection converter station that is used for the direct current transportation of cascade multi-terminal high-voltage of the utility model the 4th embodiment.
Compare with the 3rd embodiment, in cascade connection converter station, between middle straightening stream transmission line 13 and HVDC (High Voltage Direct Current) transmission line 14, coupled bypass channel 139a, the 139b that high-pressure side current conversion station 12 is carried out bypass according to the 4th embodiment.Between smoothing reactor 125a, 125b and HVDC (High Voltage Direct Current) transmission line 14, and be provided with the 800KV isolation switch among bypass channel 139a, the 139b respectively.
Figure 26 to Figure 32 shows 7 kinds of operation wiring modes according to the above-mentioned cascade connection converter station of the 4th embodiment respectively, that is:
(1) complete bipolar operation wiring;
(2) 3/4 bipolar operation wirings;
(3) 1/2 bipolar operation wirings;
(4) complete one pole ground return circuit wiring;
(5) 1/2 one pole ground return circuit wiring;
(6) complete monopole metallic loop wiring;
(7) 1/2 monopole metallic loop wiring.
In these 7 kinds of operation wiring modes, complete bipolar operation wiring mode is the mode of connection under the normal operating condition, and other various operational modes are the mode of connection under the malfunction.
Referring to Figure 26, wherein show the complete bipolar operation wiring mode under normal operating condition.Four converter valve 112a, 112b, 122a, 122b in the positive pole of low-pressure end current conversion station 11 and high-pressure side current conversion station 12 and the negative pole all put into operation.
Figure 27 A, 27B show 3/4 bipolar operation wiring.Figure 27 A shows the converter valve 112a of the low-pressure end operation wiring schematic diagram when out of service.Figure 27 B shows the converter valve 122a of the high-pressure side operation wiring schematic diagram when out of service.Shown in Figure 27 B, when the converter valve 122a of high-pressure side is out of service, form the loop by bypass channel 139a, and equipment such as smoothing reactor 125a are not connected in the operating loop.
Figure 28 A and Figure 28 B show 1/2 bipolar operation wiring.Figure 28 A shows the converter valve 122a of high-pressure side and the 122b operation wiring schematic diagram when out of service.Shown in Figure 28 A, when the converter valve 122a of high-pressure side and 122b are out of service, form the loop by bypass channel 139a, 139b, and equipment such as smoothing reactor 125a, 125b are not connected in the operating loop.Figure 28 B shows the converter valve 112a of low-pressure end and the 112b operation wiring schematic diagram when out of service.
Figure 29 shows complete one pole ground return circuit operation wiring, the converter valve 122b that wherein shows the converter valve 112b of anodal low-pressure end and high-pressure side is out of service, and the converter valve 122a of the converter valve 112a of the low-pressure end of negative pole and high-pressure side keeps the situation of operation.
Figure 30 A and Figure 30 B show 1/2 one pole ground return circuit operation wiring.
Figure 30 A shows out of service and the operation wiring schematic diagram when having only the converter valve 112a of negative pole to keep operation in the low-pressure end current conversion station 11 of converter valve 122a in the high-pressure side current conversion station 12 and 122b.Shown in Figure 30 A, when the converter valve 122a of high-pressure side is out of service, form the loop by bypass channel 139a and earth electrode circuit 126, and equipment such as smoothing reactor 125a are not connected in the operating loop.
It is out of service and operation wiring schematic diagram when having only the converter valve 122a of negative pole to keep operation in the high-pressure side current conversion station 12 wherein forms loops by earth electrode circuit 133 that Figure 30 B shows the converter valve 112a of low-pressure end current conversion station 11 and 112b.
Figure 31 shows complete monopole metallic loop operation wiring, the converter valve 122b that wherein shows the converter valve 112b of anodal low-pressure end and high-pressure side is out of service, and the converter valve 122a of the converter valve 112a of the low-pressure end of negative pole and high-pressure side keeps the situation of operation.As shown in figure 31, when the converter valve 122b of high-pressure side is out of service, constitute the loop by the bypass channel 139b and the metal line of return 128, and equipment such as smoothing reactor 125b are not connected in the operating loop.
Figure 32 A and Figure 32 B show 1/2 monopole metallic loop operation wiring.Figure 32 A shows out of service and the operation wiring schematic diagram when having only the converter valve 112a of negative pole to keep operation in the low-pressure end current conversion station 11 of converter valve 122a in the high-pressure side current conversion station 12 and 122b.Shown in Figure 32 A, when the converter valve 122a of high-pressure side and 122b are out of service, form the loop by bypass channel 139a, 139b and the metal line of return 128, and equipment such as smoothing reactor 125a, 125b are not connected in the operating loop.
Figure 32 B shows out of service and the operation wiring schematic diagram when having only the converter valve 122a of negative pole to keep operation in the high-pressure side current conversion station 12 of converter valve 112a in the low-pressure end current conversion station 11 and 112b.
The advantage of the connection plan of the 4th embodiment is: low-pressure end current conversion station 11 and high-pressure side current conversion station 12 be independent operating separately, and be independent of each other mutually (for example when the current conversion station overhaul) improved the energy availability factor of system.When the smoothing reactor of high-pressure side current conversion station 12 and DC filter broke down, low-pressure end current conversion station 11 homopolarity converters still can move, and stop transport and need not one pole.
On the basis of the connection plan at the cascade connection converter station of the 4th embodiment, can also expand other connection plans, as Figure 33 and shown in Figure 34.
Figure 33 shows first kind of expansion connection plan on the foregoing description basis, MRTB 143 and NBGS 144 wherein has been installed in the earth electrode line loop of high-pressure side current conversion station 12, and has been provided with isolation switch 130a, 130b on the smoothing reactor next door.According to this connection plan, can realize high-pressure side current conversion station 12 alone the big earthed return of one pole and one pole metallic return online switching, without the independent metal line of return operation of another converter smoothing reactor, and adopt the current conversion station temporary grounding to carry out bipolar operation.
Figure 34 shows second kind of expansion connection plan on the foregoing description basis, and MRTB 143 and NBGS 144 wherein have been installed in the earth electrode line loop of high-pressure side current conversion station 12.According to this connection plan, can realize high-pressure side current conversion station 12 alone the big earthed return of one pole and one pole metallic return online switching, adopt the current conversion station temporary grounding to carry out bipolar operation.Be with the difference of Figure 33,, when a utmost point converter one pole metal moves, need smoothing reactor branch road via another converter owing to isolation switch 130a, 130b are not set on the smoothing reactor next door.
In the structure of the cascade connection converter station of above first to the 4th embodiment that describes in conjunction with Fig. 1-34 and expansion thereof, the equal cross-over connection in two ends of the smoothing reactor in low-pressure end current conversion station 11 and high-pressure side current conversion station 12 DC filter.But the configuration mode of this DC filter is a kind of preferred scheme is not to be restrictive.Figure 35-37 shows the DC filter allocation plan of three kinds of alternatives, and the DC filter allocation plan of these alternatives can make up (replacing DC filter wherein) by rights with the various modes of connection at the cascade connection converter station of first to the 3rd embodiment shown in Fig. 1-34.In the selection of cascade multiterminal HVDC transmission system connection plan, can reasonably select the allocation plan of DC filter according to the requirement of engineering to equivalent disturbing current.
Equivalent disturbing current is defined as follows: the harmonic current of all frequencies is identical with the interference effect that harmonic current produced of certain single frequency to the integrated interference effect that communication line produced contiguous parallel or that intersect on the circuit, and this unifrequency harmonic current just is called equivalent disturbing current.According to the concrete condition of engineering, the equivalent disturbing current limit value requires and can suitably adjust, and carries out balance between improvement harmonic wave measure cost and compensation harmonic interference expense, and is minimum in the hope of harmonic wave control and reimbursement for expenses.
Possible situation has following 3 kinds:
(1) requiring under all fronts equivalent disturbing current situation up to standard, DC filter is pressed the converter configuration, is connected across converter smoothing reactor two ends, as shown in Fig. 1-34.
(2) in permission, press under the 400kV section circuit situation not up to standard, can DC filter 142a, 142b over the ground be set at high-pressure side current conversion station 12, and cancellation is across the DC filter at converter two ends, as Figure 35 and shown in Figure 36.Figure 35 shows the situation that high-pressure side current conversion station 12 is provided with earth electrode circuit 133.Figure 36 shows the situation that high-pressure side current conversion station 12 does not have the earth electrode circuit, and in the case, the harmonic current that converter produces will return through the ground network of high-pressure side current conversion station 12 earth electrode via low-pressure end current conversion station 11.
(3) allowing can to cancel DC filter, as shown in figure 37 under the situation not up to standard completely.
The utility model also provides a kind of cascade multiterminal HVDC transmission system.As shown in figure 38, this system comprises the current conversion station of sending end, the current conversion station of receiving end and the HVDC (High Voltage Direct Current) transmission line between the two.The current conversion station of sending end and receiving end links to each other with load area with AC power respectively.Wherein, one or two in sending end and the receiving end current conversion station is made of previously described cascade connection converter station according to first to the 4th embodiment.Correspondingly, AC power and load area comprise one or more AC power and load area respectively.
Need to prove that the selection to the number of the numerical value of for example high-voltage dc voltage, isolation switch and converter valve type or the like only is exemplary in this article.Those skilled in the art can make change to it according to the requirement of actual engineering.In addition, in this article, relational terms such as first and second grades only is used for an entity or operation are made a distinction with another entity or operation, and not necessarily requires or hint and have the relation of any this reality or in proper order between these entities or the operation.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby make and comprise that process, method, article or the equipment of a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or also be included as this process, method, article or equipment intrinsic key element.Do not having under the situation of more restrictions, the key element that limits by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
Preferred embodiment of the present utility model more than has been described with reference to the drawings.But clearly, these embodiment only are used for the purpose of example, and should not be regarded as the restriction to the utility model protection range.Those skilled in the art can make various modifications, be equal to and replace and improve these embodiment under the situation that does not depart from spirit of the present utility model and principle.Protection range of the present utility model is only limited by the accompanying Claim book.

Claims (21)

1. cascade connection converter station that is used for the direct current transportation of cascade multi-terminal high-voltage is characterized in that comprising:
The low-pressure end current conversion station comprises side of the positive electrode and negative side, and wherein each side comprises:
Converter transformer is coupled to first AC network,
Converter valve is coupled to described converter transformer, is used to realize the ac/dc conversion,
With
Be arranged in the smoothing reactor at described converter valve two ends; And
The high-pressure side current conversion station is connected with described low-pressure end current conversion station by middle straightening stream transmission line, and is connected to HVDC (High Voltage Direct Current) transmission line, and this high-pressure side current conversion station comprises side of the positive electrode and negative side, and wherein each side comprises:
Converter transformer is coupled to second AC network,
Converter valve is coupled to described converter transformer, is used to realize the ac/dc conversion,
With
Be arranged in the smoothing reactor at described converter valve two ends;
Wherein, in described low-pressure end current conversion station, be provided with the earth electrode circuit that is coupled to earth electrode and be coupled in the metal line of return between the positive and negative polar curve.
2. cascade connection converter according to claim 1 station is characterized in that, in described low-pressure end current conversion station and high-pressure side current conversion station, in the two ends of smoothing reactor cross-over connection DC filter.
3. cascade connection converter according to claim 1 station is characterized in that, in described high-pressure side current conversion station DC filter over the ground is set.
4. cascade connection converter according to claim 1 station is characterized in that, in described low-pressure end current conversion station and high-pressure side current conversion station, is provided with the bypass isolation switch between smoothing reactor.
5. cascade connection converter station that is used for the direct current transportation of cascade multi-terminal high-voltage is characterized in that comprising:
The low-pressure end current conversion station comprises side of the positive electrode and negative side, and wherein each side comprises:
Converter transformer is coupled to first AC network,
Converter valve is coupled to described converter transformer, is used to realize the ac/dc conversion,
With
Be arranged in the smoothing reactor at described converter valve two ends; And
The high-pressure side current conversion station is connected with described low-pressure end current conversion station by middle straightening stream transmission line, and is connected to HVDC (High Voltage Direct Current) transmission line, and this high-pressure side current conversion station comprises side of the positive electrode and negative side, and wherein each side comprises:
Converter transformer is coupled to second AC network,
Converter valve is coupled to described converter transformer, is used to realize the ac/dc conversion,
With
Be arranged in the smoothing reactor at described converter valve two ends;
Wherein, in described low-pressure end current conversion station, be provided with the earth electrode circuit that is coupled to earth electrode and be coupled in the metal line of return between the positive and negative polar curve, and in described high-pressure side current conversion station, be provided with earth electrode circuit and the neutral bus isolation switch that is coupled to earth electrode.
6. cascade connection converter according to claim 5 station is characterized in that, also is provided with the metal line of return that is coupled between the positive and negative polar curve in described high-pressure side current conversion station.
7. cascade connection converter according to claim 5 station is characterized in that, has coupled between straightening stream transmission line and the described HVDC (High Voltage Direct Current) transmission line to be used for passage that described high-pressure side current conversion station is carried out bypass in described.
8. according to each described cascade connection converter station among the claim 5-7, it is characterized in that, in described low-pressure end current conversion station and high-pressure side current conversion station, in the two ends of smoothing reactor cross-over connection DC filter.
9. according to each described cascade connection converter station among the claim 5-7, it is characterized in that, in described high-pressure side current conversion station, DC filter over the ground is set.
10. according to each described cascade connection converter station among the claim 5-7, it is characterized in that, in described low-pressure end current conversion station and high-pressure side current conversion station, between smoothing reactor, be provided with the bypass isolation switch.
11. a cascade connection converter station that is used for the direct current transportation of cascade multi-terminal high-voltage is characterized in that comprising:
The low-pressure end current conversion station comprises side of the positive electrode and negative side, and wherein each side comprises:
Converter transformer is coupled to first AC network,
Converter valve is coupled to described converter transformer, is used to realize the ac/dc conversion,
With
Be arranged in the smoothing reactor at described converter valve two ends; And
The high-pressure side current conversion station is connected with described low-pressure end current conversion station by middle straightening stream transmission line, and is connected to HVDC (High Voltage Direct Current) transmission line, and this high-pressure side current conversion station comprises side of the positive electrode and negative side, and wherein each side comprises:
Converter transformer is coupled to second AC network,
Converter valve is coupled to described converter transformer, is used to realize the ac/dc conversion,
With
Be arranged in the smoothing reactor at described converter valve two ends;
Wherein, in described low-pressure end current conversion station, be provided with the earth electrode circuit that is coupled to earth electrode and be coupled in the metal line of return between the positive and negative polar curve, in described high-pressure side current conversion station, be provided with the earth electrode circuit, neutral bus switch and the neutral bus isolation switch that are coupled to earth electrode.
12. cascade connection converter according to claim 11 station is characterized in that, also is provided with the metal line of return that is coupled between the positive and negative polar curve in described high-pressure side current conversion station.
13. according to claim 11 or 12 described cascade connection converter stations, it is characterized in that, in described low-pressure end current conversion station and high-pressure side current conversion station, in the two ends of smoothing reactor cross-over connection DC filter.
14. according to claim 11 or 12 described cascade connection converter stations, it is characterized in that, in described high-pressure side current conversion station, DC filter over the ground be set.
15. according to claim 11 or 12 described cascade connection converter stations, it is characterized in that, in described low-pressure end current conversion station and high-pressure side current conversion station, between smoothing reactor, be provided with the bypass isolation switch.
16. a cascade connection converter station that is used for the direct current transportation of cascade multi-terminal high-voltage is characterized in that comprising:
The low-pressure end current conversion station comprises side of the positive electrode and negative side, and wherein each side comprises:
Converter transformer is coupled to first AC network,
Converter valve is coupled to described converter transformer, is used to realize the ac/dc conversion,
With
Be arranged in the smoothing reactor at described converter valve two ends; And
The high-pressure side current conversion station is connected with described low-pressure end current conversion station by middle straightening stream transmission line, and is connected to HVDC (High Voltage Direct Current) transmission line, and this high-pressure side current conversion station comprises side of the positive electrode and negative side, and wherein each side comprises:
Converter transformer is coupled to second AC network,
Converter valve is coupled to described converter transformer, is used to realize the ac/dc conversion,
With
Be arranged in the smoothing reactor at described converter valve two ends;
Wherein, in described low-pressure end current conversion station, be provided with the earth electrode circuit that is coupled to earth electrode and be coupled in the metal line of return between the positive and negative polar curve, in described high-pressure side current conversion station, be provided with the earth electrode circuit, neutral bus switch and the neutral bus isolation switch that are coupled to earth electrode, and in described, coupled the passage that is used for the high-pressure side current conversion station is carried out bypass between straightening stream transmission line and the described HVDC (High Voltage Direct Current) transmission line.
17. cascade connection converter according to claim 16 station is characterized in that, also is provided with metallic(return) circuit change over switch and neutral bus earthed switch in described high-pressure side current conversion station.
18. according to claim 16 or 17 described cascade connection converter stations, it is characterized in that, in described low-pressure end current conversion station and high-pressure side current conversion station, in the two ends of smoothing reactor cross-over connection DC filter.
19. according to claim 16 or 17 described cascade connection converter stations, it is characterized in that, in described high-pressure side current conversion station, DC filter over the ground be set.
20. according to claim 16 or 17 described cascade connection converter stations, it is characterized in that, in described low-pressure end current conversion station and high-pressure side current conversion station, between smoothing reactor, be provided with the bypass isolation switch.
21. cascade multiterminal HVDC transmission system, it is characterized in that comprising the current conversion station of sending end, the current conversion station of receiving end and the HVDC (High Voltage Direct Current) transmission line between the two, wherein, at least one in the current conversion station of the current conversion station of described sending end and receiving end is by constituting according to claim 1,5,11, one of 16 described cascade connection converter stations.
CN 201020649760 2010-12-09 2010-12-09 Cascade converter station and cascade multi-terminal HVDC system Expired - Lifetime CN202068184U (en)

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