CN104426158B - Direct current transportation layer-specific access system and method - Google Patents
Direct current transportation layer-specific access system and method Download PDFInfo
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- CN104426158B CN104426158B CN201310367725.XA CN201310367725A CN104426158B CN 104426158 B CN104426158 B CN 104426158B CN 201310367725 A CN201310367725 A CN 201310367725A CN 104426158 B CN104426158 B CN 104426158B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The present invention provides direct current transportation layer-specific access system and method.This system includes: at least one current conversion station unit group;At least one switch being connected across between the DC terminal of at least one current conversion station unit group;The DC terminal of at least one current conversion station unit group can distinguish electrical couplings HVDC polar curve and ground;The exchange end of the high-pressure side current conversion station unit of at least one current conversion station unit group can be with the first electric pressure AC network electrical couplings;The exchange end of the low-pressure end current conversion station unit of at least one current conversion station unit group can be with the second electric pressure AC network electrical couplings;Controller, corresponding to the state of the transmission of inactivity on HVDC polar curve, it can control at least one switch makes it close and controls the high-pressure side current conversion station unit of at least one current conversion station unit group and low-pressure end current conversion station unit makes it work in one of rectification mode different from each other and inverter mode respectively.The utilization rate of equipment that can be properly functioning can be improved.
Description
Technical field
The present invention relates to direct current transportation layer-specific access system and method.
Background technology
" Proceedings of the CSEE " the 10th phase of volume 33 proposes a kind of extra-high voltage direct-current layer-specific access mode to improve electric network composition in the article " extra-high voltage direct-current layer-specific access mode is at the applied research of multi-infeed HVDC electrical network " that on April 5th, 2013 has delivered Liu Zhenya et al..
But, in existing direct current layer-specific access systems technology, when bipolar direct current transmission system is not at when bipolar power runs (monopolar operation or stoppage in transit) or is in stoppage in transit when monopolar D. C transmission system, often there is in leaving unused or to be run inverter in this DC transmission system.The above-mentioned at least two situation that is attributed to:
When bipolar direct current transmission system one pole or bipolar due to fault stoppage in transit, the inverter that can normally work in stoppage in transit pole (not having power to transmit on corresponding HVDC polar curve) is in stoppage in transit state;Stopping transport (not having power to transmit on HVDC polar curve) due to fault when monopolar D. C transmission system, the inverter (inverter unit) that can normally work in stopping transport extremely is also at stopping row state;Or
The construction period in bipolar direct current transmission system engineering and corresponding generating base is longer usually several years, is usually present long monopolar operational mode;The inverter that can normally work in stopping transport extremely is in idle or treats running status.
Above-mentioned situation cause can be properly functioning the idleness of equipment and cannot effectively utilize.
Summary of the invention
For above-mentioned technical problem, the present invention provides a kind of direct current transportation layer-specific access system, including: at least one current conversion station unit group, described current conversion station unit group includes high-pressure side current conversion station unit and the low-pressure end current conversion station unit connected with described high-pressure side current conversion station unit;At least one switch being connected across between the DC terminal of at least one current conversion station unit group described;Wherein: the DC terminal of at least one current conversion station unit group described can distinguish electrical couplings HVDC polar curve and ground;The exchange end of the high-pressure side current conversion station unit of at least one current conversion station unit group described can be with the first electric pressure AC network electrical couplings;The exchange end of the low-pressure end current conversion station unit of at least one current conversion station unit group described can be with the second electric pressure AC network electrical couplings;Controller, corresponding to the state of the transmission of inactivity on described HVDC polar curve, it can control at least one switch described makes it close and controls the high-pressure side current conversion station unit of at least one current conversion station unit group described and low-pressure end current conversion station unit makes it work in one of rectification mode different from each other and inverter mode respectively.By above-mentioned configuration, the utilization rate of equipment (such as current conversion station unit group) that can be properly functioning can be improved.Specifically, on HVDC polar curve when inactivity transmission, current conversion station unit group can be used for the trend distribution between different AC networks, to improve the actively regulating power of the trend between AC network.
According to another aspect of the present invention, a kind of flow control method for direct current transportation layer-specific access system is provided, described direct current transportation layer-specific access system includes: at least one current conversion station unit group, and described current conversion station unit group includes high-pressure side current conversion station unit and the low-pressure end current conversion station unit connected with described high-pressure side current conversion station unit;At least one switch being connected across between the DC terminal of at least one current conversion station unit group described;Wherein: the DC terminal of at least one current conversion station unit group described can be distinguished electric Rhizoma Nelumbinis and close HVDC polar curve and ground;The exchange end of the high-pressure side current conversion station unit of at least one current conversion station unit group described can be with the first electric pressure AC network electrical couplings;The exchange end of the low-pressure end current conversion station unit of at least one current conversion station unit group described can be with the second electric pressure AC network electrical couplings;Described method includes: corresponding to the state of the transmission of inactivity on described HVDC polar curve, controls at least one switch described and makes it close and control the high-pressure side current conversion station unit of at least one current conversion station unit group described and low-pressure end current conversion station unit makes it work in one of rectification mode different from each other and inverter mode respectively.By said method, the utilization rate of equipment (such as current conversion station unit group) that can be properly functioning can be improved.Specifically, on HVDC polar curve when inactivity transmission, current conversion station unit group can be used for the trend distribution between different AC networks, to improve the actively regulating power of the trend between AC network.
Accompanying drawing explanation
Fig. 1 illustrates direct current transportation layer-specific access system according to an embodiment of the invention;
Fig. 2 illustrates the structure of current conversion station unit;
Fig. 3 A and 3B is shown respectively the power distribution that the enforcement according to Fig. 1 is poured between the first electric pressure AC network and the second electric pressure AC network;
Fig. 4 illustrates direct current transportation layer-specific access system according to an embodiment of the invention;
Fig. 5 A is illustrated based on the total power power flowcontrol pattern of the direct current transportation layer-specific access system shown in Fig. 4;
Partial Power power flowcontrol pattern based on the direct current transportation layer-specific access system shown in Fig. 4 Fig. 5 B is shown on positive polarity HVDC polar curve inactivity transmission and has power to transmit on negative polarity HVDC polar curve;
Fig. 5 C be shown on positive polarity HVDC polar curve have power transmission and on negative polarity HVDC polar curve inactivity transmission Partial Power power flowcontrol pattern based on the direct current transportation layer-specific access system shown in Fig. 4;With
Fig. 5 D is illustrated based on the normal mode of the direct current transportation layer-specific access system shown in Fig. 4.
Detailed description of the invention
Fig. 1 illustrates direct current transportation layer-specific access system according to an embodiment of the invention.As it is shown in figure 1, direct current transportation layer-specific access system 1 is monopole type, comprising: current conversion station unit group 10, switch 11 and controller 12.Current conversion station unit group 10 includes high-pressure side current conversion station unit 100 and the low-pressure end current conversion station unit 101 connected with high-pressure side current conversion station unit 100.Current conversion station unit is to realize direct current and unit that AC power is mutually changed.Fig. 2 illustrates the structure of current conversion station unit.As in figure 2 it is shown, current conversion station unit 2 includes inverter 20, one or more converter power transformer 21 and corresponding control and protection device and the auxiliary switch assembly that one or more DC side connects.Inverter unit is mainly to be realized direct current and equipment that AC power is mutually changed by what semiconductor equipment formed, six pulse conversion devices of such as six groups valve cell compositions.Valve cell be by the semiconductor power switch device as IGCT and the relevant device such as triggering, protection, all pressure thereof by series or in parallel constitute have open, the flow device of blocking ability.Those skilled in the art is to be understood that current conversion station unit can be that six kinds of pulses moves the combination of thyristor converter device alternating current-direct current equipment, it is alternatively 12 pulsation thyristor converter device alternating current-direct current equipment combinations, or double 12 pulsation thyristor converter device alternating current-direct current equipment combination, even 24 pulsation thyristor converter device alternating current-direct current equipment combination.Return to Fig. 1, switch 11 is connected across DC terminal 10a of current conversion station unit 10, between 10b, from there through the two states of turn-on and turn-off of switch 11, the electrical connection state of the high-pressure side current conversion station unit 100 of current conversion station unit group 10 and low-pressure end current conversion station unit 101 can be switched between back-to-back and series system.DC terminal 10a of the current conversion station unit 10 of current conversion station unit group 10,10b can distinguish electrical couplings HVDC polar curve and ground, for DC side through-put power or from DC side reception power.The exchange end 100a of the high-pressure side current conversion station unit 100 of current conversion station unit group 10 can be with the first electric pressure AC network electrical couplings, for the first electric pressure AC network through-put power or from the first electric pressure AC network reception power.The exchange end 101a of the low-pressure end current conversion station unit 101 of current conversion station unit group 10 can be with the second electric pressure AC network electrical couplings, for the second electric pressure AC network through-put power or from the second electric pressure AC network reception power.Corresponding to the state of the transmission of inactivity on HVDC polar curve, controller 12 controllable switch 11 makes it close and controls the high-pressure side current conversion station unit 100 of current conversion station unit group 10 and low-pressure end current conversion station unit 101 makes it work in one of rectification mode different from each other and inverter mode respectively.Such as, when monopolar D. C transmission system is stopped transport, inactivity transmission on HVDC polar curve, and current conversion station unit group 10 still can work normally.Controller 12 controllable switch 11 makes it close, and making high-pressure side current conversion station unit 100 be operated in rectification state and low-pressure end current conversion station unit 101 is operated in inverter mode by sending angle of flow instruction to the high-pressure side current conversion station unit 100 of current conversion station unit group 10 and low-pressure end current conversion station unit 101, trend is flowed to the second electric pressure AC network (arrow A1) by the first electric pressure AC network;Or, controller 12 controllable switch 11 makes it close, and making high-pressure side current conversion station unit 100 be operated in inverter mode and low-pressure end current conversion station unit 101 is operated in rectification state by sending angle of flow instruction to the high-pressure side current conversion station unit 100 of current conversion station unit group 10 and low-pressure end current conversion station unit 101, trend is flowed to the first electric pressure AC network (arrow A2) by the second electric pressure AC network.
By above-mentioned configuration, the utilization rate of equipment (such as current conversion station unit group) that can be properly functioning can be improved.Specifically, on HVDC polar curve when inactivity transmission, current conversion station unit group can be used for the trend distribution between different AC networks, to improve the actively regulating power of the trend between AC network.
Best, corresponding to the state having power to transmit on HVDC polar curve, controller 12 can also control to switch 11 and turn it off and control the high-pressure side current conversion station unit 100 of current conversion station unit group 10 and low-pressure end current conversion station unit 101 makes to work in both it one of rectification mode and inverter mode.Such as, under conditions of HVDC system pole alignment AC network input power, controller 12 works in inverter mode by the high-pressure side current conversion station unit 100 and low-pressure end current conversion station unit 101 sending angle of flow instruction control current conversion station unit group 10;From AC network under conditions of HVDC polar curve input power, controller 12 is by sending angle of flow instruction and control the high-pressure side current conversion station unit 100 of current conversion station unit group 10 and low-pressure end current conversion station unit 101 working in rectification state.
Fig. 3 A and 3B is shown respectively the power distribution that the enforcement according to Fig. 1 is poured between the first electric pressure AC network and the second electric pressure AC network.As shown in Figure 3A, HVDC polar curve has the state that power transmits, the power that HVDC polar curve is sent/receives is 1p.u., and switch 11 shutoff, the power that the first electric pressure AC network and the second electric pressure AC network are received/send is respectively 0.5p.u..Certainly, it will be appreciated by those skilled in the art that the power that the first electric pressure AC network and the second electric pressure AC network are received/send can also distinguish other values, such as 0.3p.u. and 0.7p.u. etc..As shown in Figure 3 B, the state of inactivity transmission on HVDC polar curve, the power that HVDC polar curve is sent/receives is 0p.u., switch 11 Guan Bi, the high-pressure side current conversion station unit 100 and the low-pressure end current conversion station unit 101 that control current conversion station unit group 10 work in one of rectification mode different from each other and inverter mode respectively.Such as, high-pressure side current conversion station unit 100 is operated in rectification state and low-pressure end current conversion station unit 101 is operated in inverter mode.In this case, the power that the first electric pressure AC network sends/receives may be controlled to 0 to 0.5p.u., and the second electric pressure AC network is 0 to 0.5p.u. from the power controllable that the first estate AC network receives/sends.Otherwise, according to existing direct current transportation layer-specific access system, the power that the second electric pressure AC network receives/sends is 0p.u..Such that it is able to the change reduced between state and the state that inactivity transmits on HVDC polar curve that the second electric pressure AC network power of being received/sending has power to transmit on HVDC polar curve.The power being received for the first electric pressure AC network and the second electric pressure AC network/sending is respectively other values, the situation of such as 0.3p.u. and 0.7p.u., the power that first electric pressure AC network sends/receives may be controlled to 0.3p.u., and the second electric pressure AC network is 0 to 0.3p.u. from the power controllable that the first estate AC network receives/sends, equally reduce state that the power that the second electric pressure AC network received/send has power to transmit on HVDC polar curve and change between the state of inactivity transmission on HVDC polar curve.By adjusting the trend between AC network, power or the power of reception that AC network sends can be controlled.
Fig. 4 illustrates direct current transportation layer-specific access system according to an embodiment of the invention.As shown in Figure 4, direct current transportation layer-specific access system 4 is that ambipolar system is for including positive polarity HVDC polar curve and the DC power transmission line of negative polarity HVDC polar curve.As shown in Figure 4, direct current transportation layer-specific access system 4 includes that first current conversion station unit group the 40, second current conversion station unit group 41, first switchs 42, second switch 43 and controller 44.First current conversion station unit group 40 is similar with the embodiment described in Fig. 1 with the structure of the second current conversion station unit group 41, no longer repeats at this.First switch 42 is connected across between DC terminal 40a of the first current conversion station unit group 40,40b, and second switch 43 is connected across between DC terminal 41a of the second current conversion station unit group 41,41b.DC terminal 40a of the first current conversion station unit group 40, 40b can distinguish electric Rhizoma Nelumbinis and close positive polarity HVDC polar curve and ground, DC terminal 41a of the second current conversion station unit group 41, 41b can distinguish electrical couplings negative polarity HVDC polar curve and described, the exchange end of the high-pressure side current conversion station unit 400 of the first current conversion station unit group 40 can be with the first electric pressure AC network electrical couplings, the exchange end of the low-pressure end current conversion station unit 401 of the first current conversion station unit group 40 can be with the second electric pressure AC network electrical couplings, the exchange end of the high-pressure side current conversion station unit 410 of the second current conversion station unit group 41 can be with the first electric pressure AC network electrical couplings, the exchange end of the low-pressure end current conversion station unit 411 of the second current conversion station unit group 41 can be with the second electric pressure AC network electrical couplings.Corresponding to the state of the transmission of inactivity on positive polarity HVDC polar curve, controller 44 can control the low-pressure end current conversion station unit 401 of high-pressure side current conversion station unit 400 and the first current conversion station unit group 40 that described first switch 42 makes it close and controls the first current conversion station unit group 40 makes it work in one of rectification mode different from each other and inverter mode respectively;And corresponding to the state of the transmission of inactivity on negative polarity HVDC polar curve, controller 44 can control the low-pressure end current conversion station unit 411 of high-pressure side current conversion station unit 410 and the second current conversion station unit group 41 that second switch 43 makes it close and controls the second current conversion station unit group 41 makes it work in one of rectification mode different from each other and inverter mode respectively.Direct current transportation layer-specific access system shown in Fig. 4 is with the difference of the direct current transportation layer-specific access system shown in Fig. 1: the bipolar direct current transmission structure that the direct current transportation layer-specific access system shown in Fig. 4 uses, and can improve the ability to transmit electricity of DC transmission system compared to the monopolar D. C transmission of electricity structure shown in Fig. 1.
By using the structure shown in Fig. 4, total power power flowcontrol pattern can be used.Fig. 5 A is illustrated based on the total power power flowcontrol pattern of the direct current transportation layer-specific access system shown in Fig. 4.As shown in Figure 5A, state corresponding to the transmission of inactivity in positive polarity and negative polarity HVDC polar curve, the dipolar configuration of one end of HVDC transmission system may be configured to be connected between two AC networks for bipolar back-to-back DC system, can carry out large-scale bidirectional power control for unipolarity.
Best, corresponding to the state having power to transmit on positive polarity HVDC polar curve, controller 44 can control the first switch 42 and turn it off and control the high-pressure side current conversion station unit 400 of the first current conversion station unit group 40 and low-pressure end current conversion station unit 401 makes to work in both it one of rectification mode and inverter mode;Corresponding to the state having power to transmit on negative polarity HVDC polar curve, controller 44 can control second switch 43 and turn it off and control the high-pressure side current conversion station unit 410 of the second current conversion station unit group 41 and low-pressure end current conversion station unit 411 makes to work in both it one of rectification mode and inverter mode.Further, direct current transportation layer-specific access system 4 can use Partial Power power flowcontrol pattern.Partial Power power flowcontrol pattern based on the direct current transportation layer-specific access system shown in Fig. 4 Fig. 5 B is shown on positive polarity HVDC polar curve inactivity transmission and has power to transmit on negative polarity HVDC polar curve.First switch 42 conducting and second switch 43 turn off.Such as Fig. 5 B, both the high-pressure side current conversion station unit 410 of the second current conversion station unit group 41 and low-pressure end current conversion station unit 411 work in rectification mode/inverter mode, and power is from negative polarity HVDC system pole alignment the first electric pressure AC network and the second electric pressure AC network/transmit to negative polarity HVDC polar curve from the first electric pressure AC network and the second electric pressure AC network.The high-pressure side current conversion station unit 400 of the first current conversion station unit group 40 is operated in rectification state and its low-pressure end current conversion station unit 401 is operated in inverter mode, and trend is flowed to the second electric pressure AC network (arrow A1) by the first electric pressure AC network;Or, high-pressure side current conversion station unit 400 is operated in inverter mode and low-pressure end current conversion station unit 401 is operated in rectification state, and trend is flowed to the first electric pressure AC network (arrow A2) by the second electric pressure AC network.Fig. 5 C be shown on positive polarity HVDC polar curve have power transmission and on negative polarity HVDC polar curve inactivity transmission Partial Power power flowcontrol pattern based on the direct current transportation layer-specific access system shown in Fig. 4.Fig. 5 D is illustrated based on the normal mode of the direct current transportation layer-specific access system shown in Fig. 4.Table 1 provides state and the power flow direction of the parts of the direct current transportation layer-specific access system of Fig. 5 A to 5D.Positive polarity HVDC polar curve and negative polarity HVDC Pole line through-put power 1p.u. respectively.In Table 1, shown tidal current between network transmission capacity perunit value is using the nominal transmission power of current conversion station unit group as base value.
Table 1
From the point of view of unipolarity, the part power flowcontrol pattern shown in Fig. 5 B and Fig. 5 C under an electrode systems is still in normal operation state, can make the DC equipment of another pole realize two electricity tidal current between network distribution functions.
Preferably, direct current transportation layer-specific access system also includes the first detection part according to an embodiment of the invention, for the magnitude of voltage of detection the first electric pressure AC network；Second detection part, for the magnitude of voltage of detection the second electric pressure AC network；Wherein, controller according to the magnitude of voltage by the first detection part detection and can be controlled in described first electric pressure AC network and the trend of described second electric pressure AC network by the magnitude of voltage of the second detection part detection.
Best, direct current transportation layer-specific access system also includes man machine interface according to an embodiment of the invention, and its middle controller can control in described first electric pressure AC network and the trend of described second electric pressure AC network according to the instruction received by man machine interface.
Although some preferred embodiment with reference to the present invention illustrate and describes the present invention, but it will be appreciated by those skilled in the art that, in the case of without departing substantially from the spirit and scope of the present invention as defined in appended claims, can in the form and details it be made a variety of changes.
Claims (14)
1. a direct current transportation layer-specific access system, it is characterised in that including:
At least one current conversion station unit group, described current conversion station unit group include high-pressure side current conversion station unit and with
The low-pressure end current conversion station unit of described high-pressure side current conversion station unit series connection；
At least one switch being connected across between the DC terminal of at least one current conversion station unit group described；
Wherein:
The DC terminal of at least one current conversion station unit group described for respectively electrical couplings HVDC polar curve and
Ground；
The exchange end of the high-pressure side current conversion station unit of at least one current conversion station unit group described is for electric with first
Pressure grade AC network electrical couplings；
The exchange end of the low-pressure end current conversion station unit of at least one current conversion station unit group described is for electric with second
Pressure grade AC network electrical couplings；
Controller, corresponding to the state of the transmission of inactivity on described HVDC polar curve, it is used for controlling
At least one switch described makes it close and controls the high-pressure side of at least one current conversion station unit group described to change
Stream station unit and low-pressure end current conversion station unit make it work in rectification mode different from each other and inversion mould respectively
One of formula.
2. direct current transportation layer-specific access system as claimed in claim 1, wherein:
Described controller is corresponding to the state having power to transmit on described HVDC polar curve, and it is used for controlling
System at least one switch described turns it off and controls the high-pressure side of at least one current conversion station unit group described
Current conversion station unit and low-pressure end current conversion station unit make to work in rectification mode or inverter mode both it.
3. direct current transportation layer-specific access system as claimed in claim 1, comprising:
At least one current conversion station unit group described includes: the first current conversion station unit group and the second current conversion station unit
Group；
The switch being connected across between the DC terminal of at least one current conversion station unit group described includes: be connected across institute
State the between the DC terminal of the first current conversion station unit group first switch and be connected across described second current conversion station unit
Second switch between the DC terminal of group；
Wherein:
The DC terminal of described first current conversion station unit group is for electrical couplings positive polarity HVDC polar curve respectively
And ground；
The DC terminal of described second current conversion station unit group is for electrical couplings negative polarity HVDC polar curve respectively
With described；
The exchange end of the high-pressure side current conversion station unit of described first current conversion station unit group is used for and the first voltage etc.
Level AC network electrical couplings；
The exchange end of the low-pressure end current conversion station unit of described first current conversion station unit group is used for and the second voltage etc.
Level AC network electrical couplings；
The exchange end of the high-pressure side current conversion station unit of described second current conversion station unit group is used for and the first voltage etc.
Level AC network electrical couplings；
The exchange end of the low-pressure end current conversion station unit of described second current conversion station unit group is used for and the second voltage etc.
Level AC network electrical couplings；
Described controller,
Corresponding to the state of the transmission of inactivity on described positive polarity HVDC polar curve, it is used for controlling institute
State the first switch make it close and control described first current conversion station unit group high-pressure side current conversion station unit and
The low-pressure end current conversion station unit of described first current conversion station unit group makes it work in rectification different from each other respectively
One of pattern and inverter mode；Or transmit corresponding to inactivity on described negative polarity HVDC polar curve
State, it is used for controlling described second switch makes it close and controls described second current conversion station unit group
High-pressure side current conversion station unit and the low-pressure end current conversion station unit of described second current conversion station unit group make it respectively
Work in one of rectification mode different from each other and inverter mode.
4. direct current transportation layer-specific access system as claimed in claim 3, wherein:
Described controller corresponding to the state having power to transmit on described positive polarity HVDC polar curve, its
Turn it off and control the high-pressure side of described first current conversion station unit group change for controlling described first switch
Stream station unit and low-pressure end current conversion station unit make to work in both it one of rectification mode and inverter mode；And
And corresponding to the state having power to transmit on described negative polarity HVDC polar curve, it is used for controlling described
Second switch turns it off and controls the high-pressure side current conversion station unit of described second current conversion station unit group and low
Pressure side current conversion station unit makes to work in both it one of rectification mode and inverter mode.
5. direct current transportation layer-specific access system as claimed in claim 1, also includes:
First detection part, for the magnitude of voltage of detection the first electric pressure AC network；
Second detection part, for the magnitude of voltage of detection the second electric pressure AC network；
Wherein:
Described controller is for according to the magnitude of voltage detected by described first detection part and being examined by described second
The magnitude of voltage surveying parts detection controls in described first electric pressure AC network and described second electric pressure
The trend of AC network.
6. direct current transportation layer-specific access system as claimed in claim 1, also includes:
Man machine interface；
Wherein:
Described controller is for controlling in described first electric pressure according to the instruction received by man machine interface
AC network and the trend of described second electric pressure AC network.
7. the direct current transportation layer-specific access system as described in claim 5 or 6, wherein:
Described controller is at the high-pressure side current conversion station unit controlling at least one current conversion station unit group described
Low-pressure end current conversion station unit in rectification mode and control at least one current conversion station unit group described is in inverse
Change pattern flows to described second voltage etc. to control described trend from described first electric pressure AC network
Level AC network.
8. the direct current transportation layer-specific access system as described in claim 5 or 6, wherein:
Described controller is at the low-pressure end current conversion station unit controlling at least one current conversion station unit group described
High-pressure side current conversion station unit in rectification mode and control at least one current conversion station unit group described is in inverse
Change pattern flows to described first voltage etc. to control described trend from described second electric pressure AC network
Level AC network.
9. for a flow control method for direct current transportation layer-specific access system,
Described direct current transportation layer-specific access system includes:
At least one current conversion station unit group, described current conversion station unit group include high-pressure side current conversion station unit and with
The low-pressure end current conversion station unit of described high-pressure side current conversion station unit series connection；
At least one switch being connected across between the DC terminal of at least one current conversion station unit group described；
Wherein:
The DC terminal of at least one current conversion station unit group described for respectively electrical couplings HVDC polar curve and
Ground；
The exchange end of the high-pressure side current conversion station unit of at least one current conversion station unit group described is for electric with first
Pressure grade AC network electrical couplings；
The exchange end of the low-pressure end current conversion station unit of at least one current conversion station unit group described is for electric with second
Pressure grade AC network electrical couplings；
Described method includes: corresponding to the state of the transmission of inactivity on described HVDC polar curve, controls
At least one switch described makes it close and controls the high-pressure side of at least one current conversion station unit group described to change
Stream station unit and low-pressure end current conversion station unit make it work in rectification mode different from each other and inversion mould respectively
One of formula.
10. flow control method as claimed in claim 9, including:
Corresponding to the state having power to transmit on described HVDC polar curve, its be used for controlling described at least
One switch turns it off and controls the high-pressure side current conversion station unit of at least one current conversion station unit group described
Make both it, to work in rectification mode or inverter mode with low-pressure end current conversion station unit.
11. flow control methods as claimed in claim 9,
Described direct current transportation layer-specific access system includes also including:
First detection part, for the magnitude of voltage of detection the first electric pressure AC network；
Second detection part, for the magnitude of voltage of detection the second electric pressure AC network；
Described method also includes:
According to the magnitude of voltage by described first detection part detection and the electricity by described second detection part detection
Pressure value controls at described first electric pressure AC network and the tide of described second electric pressure AC network
Stream.
12. flow control methods as claimed in claim 9,
Described direct current transportation layer-specific access system includes also including:
Man machine interface；
Described method also includes:
Control at described first electric pressure AC network and described according to the instruction received by man machine interface
The trend of the second electric pressure AC network.
13. flow control methods as described in claim 11 or 12, also include:
Control the high-pressure side current conversion station unit of at least one current conversion station unit group described be in rectification mode and
The low-pressure end current conversion station unit controlling at least one current conversion station unit group described is in inverter mode to control
Described trend flows to described second electric pressure AC network from described first electric pressure AC network.
14. flow control methods as described in claim 11 or 12, also include:
Control the low-pressure end current conversion station unit of at least one current conversion station unit group described be in rectification mode and
The high-pressure side current conversion station unit controlling at least one current conversion station unit group described is in inverter mode to control
Described trend flows to described first electric pressure AC network from described second electric pressure AC network.
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| CN104734205B (en) * | 2015-03-27 | 2018-01-19 | 国家电网公司 | A kind of direct current transformation controller based on DC/AC converters |
| CN106611958B (en) * | 2015-10-23 | 2019-06-28 | 中国电力科学研究院 | One kind ± 1100kV extra-high voltage direct-current transmission engineering layer-specific access mode system debug method |
| CN106816869B (en) * | 2015-11-27 | 2019-07-19 | 中国电力科学研究院 | Near region Line Flow method of adjustment under a kind of direct current layer-specific access mode |
| CN108521137B (en) * | 2018-04-26 | 2020-11-03 | 国网经济技术研究院有限公司 | Hybrid layered direct-current power transmission system and method |
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| CN102593857A (en) * | 2012-03-05 | 2012-07-18 | 南京南瑞继保电气有限公司 | Method for configuring multiport direct-current transmission control system |
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| WO2012037964A1 (en) * | 2010-09-21 | 2012-03-29 | Abb Technology Ag | Series - connected dc / dc converter for controlling the power flow in a hvdc power transmission system |
| US9048694B2 (en) * | 2012-02-01 | 2015-06-02 | Abb Research Ltd | DC connection scheme for windfarm with internal MVDC collection grid |
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| CN101882792A (en) * | 2010-06-30 | 2010-11-10 | 国家电网公司 | Connection method for ultrahigh-voltage direct current transmission and ultrahigh-voltage converter stations |
| CN102593857A (en) * | 2012-03-05 | 2012-07-18 | 南京南瑞继保电气有限公司 | Method for configuring multiport direct-current transmission control system |
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