CN105281354A - Method of DC power transmission inversion side for accessing to AC system - Google Patents
Method of DC power transmission inversion side for accessing to AC system Download PDFInfo
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- CN105281354A CN105281354A CN201410250916.2A CN201410250916A CN105281354A CN 105281354 A CN105281354 A CN 105281354A CN 201410250916 A CN201410250916 A CN 201410250916A CN 105281354 A CN105281354 A CN 105281354A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- 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]
Abstract
The invention discloses a method of a DC power transmission inversion side for accessing to an AC system. The electrode 1 and the electrode 2 of a DC system inversion side are respectively accessed to different current conversion buses. Each current conversion bus is respectively connected with different AC system partitions via AC lines. A bus interconnection switch is arranged between the current conversion buses of the electrode 1 and the electrode 2. The electrode 1 and the electrode 2 of the DC system inversion side can be accessed to different AC system partitions for operation by controlling on/off of the bus interconnection switch. With application of the scheme, power transmission to two receiving ends through one transmitting end can be realized by means of DC power transmission so that the operation risk of a high-capacity DC system can be reduced and operation reliability of a receiving end power grid can be enhanced.
Description
Technical field
The present invention relates to power transmission and distribution technical field, be specifically related to the method for existing DC transmission system incoming transport system.
Background technology
Direct current transportation as ripe, Large Copacity, remote conveying power technology reliably, in China transprovincially, played important function in district's networking project.Along with putting into operation of more and more DC engineering, south China electrical network, East China Power Grid have defined typical direct current many feed-ins receiving-end system structure, and in planning, also will have more DC line drop point in these regions.According to the planning of China DC transmission engineering, the ratio of direct current transportation capacity in whole electric power system transmission capacity will improve further, and DC transmission system ruuning situation will significantly strengthen the fail safe of whole system, economic influence.
At present, tradition reaches 800kV based on the DC transmission system voltage of thyristor, and transmission power reaches 8000MW.Along with the improving constantly of DC transmission engineering electric pressure, transmitted power constantly increase, the interaction property between ac and dc systems and between each direct current system will be more complicated.For extra-high voltage direct-current transmission, because transmission capacity is larger, adopt receiving end drop point power of dissolving usually more difficult, inevitable contradiction is there is in restriction grid short circuit levels of current with raising system short-circuit ratio, receiving end AC system breaks down commutation failure or locking while of causing high-capacity direct current bipolar, cause larger unbalanced power and power flow transfer, be enough to the safe and stable operation threatening whole system.And adopt multiple distributing receiving end comparatively easy to system to power of dissolving, also less to the impact of receiving end AC system during fault.On the other hand, along with electrical network development, AC system is in order to optimized network structure, and avoid occurring electromagnetic looped network, reducing short circuit current, adopting layering and zoning to run becomes inexorable trend.
Summary of the invention
The present invention proposes a kind of direct current transportation inverter side incoming transport systems approach, and direct current system inversion side pole 1,2 two, pole pole drop point separately, access different AC system subregion respectively.As direct current receiving end AC system is divided into two independently AC system subregions at a current conversion station, then pole 1, pole 2 change of current bus are set at this station, direct current system inversion side pole 1, pole 2 access different change of current bus respectively, two pole change of current buses are connected with respective AC system subregion respectively by alternating current circuit, between pole 1, pole 2 change of current bus, bar coupler is set, by cut-offfing of control bus interconnection switch, realize the partition running of receiving end AC network; As direct current receiving end two AC system subregions do not split at same current conversion station, then at receiving end two AC system subregions, current conversion station is set respectively, direct current system inversion side pole 1, pole 2 is accessed respectively the different current conversion station of receiving end.
Further, as direct current receiving end AC system is divided into two independently AC system subregions at a current conversion station, then pole 1 is set at this current conversion station, pole 2 change of current bus, direct current system inversion side pole 1, pole 2 accesses different change of current bus respectively, pole 1, between pole 2 change of current bus, bar coupler state is " dividing " position, configuration pole 1, pole 2 alternating current filter, pole 1, pole 2 alternating current filter accesses each pole change of current bus respectively, pole 1, pole 2 adopts one pole control model to control each pole through-put power, the switching of alternating current filter extremely affiliated is separately controlled respectively by each pole transmission power size.As between pole 1, pole 2 change of current bus, bar coupler state is " conjunction " position, then receiving end AC system 1, receiving end AC system 2 form an AC system, pole 1, pole 2 adopt bipolar control model to control each pole through-put power, pole 1, the unified control of pole 2 alternating current filter.
Further, as direct current receiving end two AC system subregions do not split at same current conversion station, then receiving end current conversion station is set respectively at receiving end two AC system subregions, direct current system inversion side pole 1, pole 2 are accessed respectively the different current conversion station of receiving end, bi-pole area and earth electrode are arranged in one of them current conversion station, be connected by DC power transmission line between receiving end two current conversion stations, form the MTDC transmission system of a sending end two receiving ends.Receiving end two current conversion stations configure pole 1, pole 2 alternating current filter respectively, and pole 1, pole 2 adopt one pole control model to control each pole through-put power, control the switching of alternating current filter extremely affiliated separately respectively by each pole transmission power size.
Feature of the present invention is: realize direct current system pole 1, different sub area division is accessed at the two poles of the earth, pole 2 respectively, make receiving end DC bipolar drop point separately, reduce between DC bipolar and intercouple, reduce DC bipolar influence each other and then reduce because direct-current commutation failure causes receiving-end system to fluctuate, cause the larger unbalanced power of receiving-end system and power flow transfer, thus the possibility that influential system stability occurs, avoid receiving-end system occurrence of large-area linksystem accident, reduce high-capacity direct current system cloud gray model risk, improve receiving end operation of power networks reliability, there is good engineer applied be worth.
Accompanying drawing explanation
Fig. 1 is typical bipolar DC transmission system principle assumption diagram
Fig. 2 is the direct current transportation inverter side access system plan 1 that the present invention proposes
Fig. 3 is the direct current transportation inverter side access system plan 2 that the present invention proposes
Embodiment
This patent is according to direct current transportation development trend and AC system partition running feature, a kind of direct current transportation inverter side incoming transport systems approach is proposed, direct current transportation can be adopted to realize a sending end to two receiving end power transmissions, fault in ac transmission system is avoided to cause bipolar commutation failure and the DC bipolar block of simultaneously occurring of high-capacity direct streaming system to cause receiving end AC system to produce larger unbalanced power and power flow transfer and then occurrence of large-area linksystem accident, reduce high-capacity direct current system cloud gray model risk, improve receiving end operation of power networks reliability.
Below with reference to drawings and the specific embodiments, technical scheme of the present invention is described in detail.
Figure 1 shows that a typical bipolar DC transmission system principle assumption diagram, Fig. 2, Fig. 3 are two kinds of direct current transportation inverter side access system plan schematic diagrams that the present invention proposes.
As shown in Figure 2, as direct current receiving end AC system is divided into two independently AC system subregions at a current conversion station, then pole 1, pole 2 change of current bus are set at this station, direct current system inversion side pole 1, pole 2 access different change of current bus respectively, pole 1, pole 2 change of current bus are connected with receiving end AC system 1, receiving end AC system 2 respectively by m bar, n bar alternating current circuit, between pole 1, pole 2 change of current bus, bar coupler is set, by cut-offfing of control bus interconnection switch, realize the partition running of receiving end AC network.Between pole 1, pole 2 change of current bus, bar coupler state is " dividing " position, configuration pole 1, pole 2 alternating current filter, pole 1, pole 2 alternating current filter access each pole change of current bus respectively, pole 1, pole 2 adopt one pole control model to control each pole through-put power, control the switching of alternating current filter extremely affiliated separately respectively by each pole transmission power size.As between pole 1, pole 2 change of current bus, bar coupler state is " conjunction " position, then receiving end AC system 1, receiving end AC system 2 form an AC system, pole 1, pole 2 adopt bipolar control model to control each pole through-put power, pole 1, the unified control of pole 2 alternating current filter, direct current power under bipolar DC operational mode controls and alternating current filter controls to be prior art, does not repeat them here.
As shown in Figure 3, as direct current receiving end two AC system subregions do not split at same current conversion station change of current bus, then Inverter Station 1 and Inverter Station 2 are set respectively at receiving end two AC system subregions, Inverter Station 1 and Inverter Station 2 are accessed respectively in direct current system inversion side pole 1, pole 2, receiving end bi-pole area and earth electrode are arranged in Inverter Station 1, be connected by DC power transmission line between Inverter Station 1 and Inverter Station 2, form the MTDC transmission system of a sending end two receiving ends.The each current conversion station of receiving end configures pole 1, pole 2 alternating current filter respectively, and pole 1, pole 2 adopt one pole control model to control each pole through-put power, controls the switching of alternating current filter extremely affiliated separately respectively by each pole transmission power size.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.
Claims (4)
1. a direct current transportation inverter side incoming transport systems approach, is characterized in that: direct current system inversion side pole 1,2 two, pole pole drop point separately, access different AC system subregion respectively; As direct current receiving end AC system is divided into two independently AC system subregions at a current conversion station, then pole 1, pole 2 change of current bus are set at this station, direct current system inversion side pole 1, pole 2 access different change of current bus respectively, two pole change of current buses are connected with respective AC system subregion respectively by alternating current circuit, between pole 1, pole 2 change of current bus, bar coupler is set, by cut-offfing of control bus interconnection switch, realize the partition running of receiving end AC network; As direct current receiving end two AC system subregions do not split at same current conversion station change of current bus, then at receiving end two AC system subregions, current conversion station is set respectively, direct current system inversion side pole 1, pole 2 is accessed respectively the different current conversion station of receiving end.
2. a kind of direct current transportation inverter side incoming transport systems approach according to claim 1, it is characterized in that: as direct current receiving end AC system is divided into two independently AC system subregions at a current conversion station, then pole 1 is set at this current conversion station, pole 2 change of current bus, direct current system inversion side pole 1, pole 2 accesses different change of current bus respectively, pole 1, between pole 2 change of current bus, bar coupler state is " dividing " position, configuration pole 1, pole 2 alternating current filter, pole 1, pole 2 alternating current filter accesses each pole change of current bus respectively, pole 1, pole 2 adopts one pole control model to control each pole through-put power, the switching of alternating current filter extremely affiliated is separately controlled respectively by each pole transmission power size.
3. a kind of direct current transportation inverter side incoming transport systems approach according to claim 1 and 2, it is characterized in that: if bar coupler state between pole 1, pole 2 change of current bus is " conjunction " position, then receiving end AC system 1, receiving end AC system 2 form an AC system, pole 1, pole 2 adopt bipolar control model to control each pole through-put power, pole 1, the unified control of pole 2 alternating current filter.
4. a kind of direct current transportation inverter side incoming transport systems approach according to claim 1, it is characterized in that: as direct current receiving end two AC system subregions do not split at same current conversion station change of current bus, then receiving end current conversion station is set respectively at receiving end two AC system subregions, direct current system inversion side pole 1, pole 2 are accessed respectively the different current conversion station of receiving end, receiving end bi-pole area and earth electrode are arranged in one of them current conversion station, be connected by DC power transmission line between receiving end two current conversion stations, form the MTDC transmission system of a sending end two receiving ends; The each current conversion station of receiving end configures pole 1, pole 2 alternating current filter respectively, and pole 1, pole 2 adopt one pole control model to control each pole through-put power, controls the switching of alternating current filter extremely affiliated separately respectively by each pole transmission power size.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105914772A (en) * | 2016-04-26 | 2016-08-31 | 华中科技大学 | Hybrid DC power transmission system having DC fault blocking capacity and control method thereof |
| CN106410825A (en) * | 2016-10-26 | 2017-02-15 | 华北电力大学 | Method for prediction of electrical power system electromechanical oscillation mode after accessing multi-port direct current system |
| CN106936153A (en) * | 2017-04-28 | 2017-07-07 | 南方电网科学研究院有限责任公司 | A kind of new extra-high voltage DC transmission system and method for operation changing method |
| CN108923450A (en) * | 2018-07-16 | 2018-11-30 | 东南大学 | A kind of current source type HVDC transmission system and its operation method |
| CN109560565A (en) * | 2017-09-27 | 2019-04-02 | 南京南瑞继保电气有限公司 | A kind of flexible DC transmission bipolar DC system inverter overload protection method |
| CN110266011A (en) * | 2019-07-05 | 2019-09-20 | 南京南瑞继保工程技术有限公司 | Rail traffic Load flow calculation dynamic network reconstruction method and tidal current computing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109245181B (en) * | 2018-10-15 | 2020-12-04 | 中国南方电网有限责任公司电网技术研究中心 | Control and protection system configuration of flexible direct current polarization access topological structure |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105914772A (en) * | 2016-04-26 | 2016-08-31 | 华中科技大学 | Hybrid DC power transmission system having DC fault blocking capacity and control method thereof |
| CN105914772B (en) * | 2016-04-26 | 2019-03-05 | 华中科技大学 | The mixed type DC transmission system and control method for having DC Line Fault blocking ability |
| CN106410825A (en) * | 2016-10-26 | 2017-02-15 | 华北电力大学 | Method for prediction of electrical power system electromechanical oscillation mode after accessing multi-port direct current system |
| CN106936153A (en) * | 2017-04-28 | 2017-07-07 | 南方电网科学研究院有限责任公司 | A kind of new extra-high voltage DC transmission system and method for operation changing method |
| CN106936153B (en) * | 2017-04-28 | 2023-10-20 | 南方电网科学研究院有限责任公司 | Novel extra-high voltage direct current transmission system and operation mode switching method |
| CN109560565A (en) * | 2017-09-27 | 2019-04-02 | 南京南瑞继保电气有限公司 | A kind of flexible DC transmission bipolar DC system inverter overload protection method |
| CN109560565B (en) * | 2017-09-27 | 2022-04-19 | 南京南瑞继保电气有限公司 | Overload protection method for converter of flexible direct current transmission bipolar system |
| CN108923450A (en) * | 2018-07-16 | 2018-11-30 | 东南大学 | A kind of current source type HVDC transmission system and its operation method |
| CN110266011A (en) * | 2019-07-05 | 2019-09-20 | 南京南瑞继保工程技术有限公司 | Rail traffic Load flow calculation dynamic network reconstruction method and tidal current computing method |
| CN110266011B (en) * | 2019-07-05 | 2020-11-17 | 南京南瑞继保工程技术有限公司 | Dynamic network reconstruction method for track traffic load flow calculation and load flow calculation method |
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| CN105281354B (en) | 2018-03-13 |
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