WO2011092302A2 - Système de connexion de réseau d'énergie électrique et système et procédé de transmission d'énergie électrique - Google Patents

Système de connexion de réseau d'énergie électrique et système et procédé de transmission d'énergie électrique Download PDF

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Publication number
WO2011092302A2
WO2011092302A2 PCT/EP2011/051245 EP2011051245W WO2011092302A2 WO 2011092302 A2 WO2011092302 A2 WO 2011092302A2 EP 2011051245 W EP2011051245 W EP 2011051245W WO 2011092302 A2 WO2011092302 A2 WO 2011092302A2
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WO
WIPO (PCT)
Prior art keywords
controllable switch
switch device
voltage
electric energy
current
Prior art date
Application number
PCT/EP2011/051245
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English (en)
Other versions
WO2011092302A3 (fr
Inventor
Xue Zhi Wu
Jing KE
Ji Long Yao
Original Assignee
Siemens Aktiengesellschaft
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Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2011092302A2 publication Critical patent/WO2011092302A2/fr
Publication of WO2011092302A3 publication Critical patent/WO2011092302A3/fr

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Classifications

    • 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
    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
    • H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
    • 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]

Definitions

  • the present invention relates to an electric energy grid connecting system and an electric energy transmission system and method.
  • FIG 1 is a schematic diagram showing a conventional electric energy grid connecting system which generates electric power by using offshore wind power.
  • the electric energy grid connecting system 10 comprises the offshore electric energy transmission system 100 and the onshore electric energy receiving system 150.
  • the electric energy transmission system 100 comprises N wind power generation units 102, N AC/DC converters 104, N
  • N is a positive integer.
  • the N wind power generation units 102 separately generate electric power using wind power to generate N ACs .
  • the N AC/DC converters 104 convert the generated N ACs into N DCs.
  • the N capacitors 108 filter the received N DCs to further remove the AC part from the N DCs.
  • the N DC/AC converters 110 convert the filtered N DCs to N ACs and input them to the local power grid 112.
  • the AC transformer 114 transforms the ACs in the local power grid 112 into the ACs which are suited for rectification.
  • the silicon controlled rectifier 118 rectifies the ACs transformed by the AC transformer 114 to obtain HVDC and input it into the HVDC link in the electric energy receiving system 150 for transmission.
  • the electric energy receiving system 150 comprises the HVDC link 152 and the silicon controlled inverter 156.
  • the HVDC link 152 transmits the HVDC input from the electric energy transmission system 100.
  • the silicon controlled inverter 156 converts the HVDC from the HVDC link 152 into AC and inputs it to the power grid on shore.
  • FIG. 1 shows a schematic diagram of another conventional electric energy grid connecting system
  • another conventional electric energy grid connecting system 20 comprises the offshore electric energy transmission system 200 and the onshore electric energy receiving system 250.
  • the electric energy transmission system 200 comprises N wind power generation units 202, N rectifiers (AC/DC) 206 and N capacitors 210.
  • the N wind power generation units 202 are configured to generate N wind power.
  • the N rectifiers 206 convert the generated N ACs to N DCs.
  • the N capacitors 210 filter the converted N DCs to further remove the AC part from the N DCs, wherein HVDC from the cascaded connection of the filtered N DCs is input to the HVDC link in the electric energy
  • the electric energy receiving system 250 comprises the HVDC transmission link 252, the grid connecting inverter 256 and the inverter transformer 260.
  • the HVDC transmission link 252 transmits the HVDC input from the electric energy
  • the grid connecting inverter 256 converts the HVDC from the HVDC transmission link 252 to AC.
  • the inverter transformer 260 transforms the AC converted by the grid connecting inverter 256 into the AC meeting the requirements of the power grid on shore and inputs it to the power grid on shore.
  • the electric energy grid connecting system 20 also has its shortcomings. Particularly, in the electric energy grid connecting system 20, the transmission is realized by converting the N ACs generated by the N wind power generation units 202 into N DCs and connecting them in series to become the HVDC. As a result, each wind power generation unit in the N wind power generation units 202 requires different voltage withstand capacity and insulation magnitude to the ground, wherein the wind power generation unit at the highest end may require dozens to hundreds of kilovolts of insulation voltage to the ground, which results in the need for diversified designs of the wind power generation units and AC/DC
  • the object of this invention is to provide an electric energy grid connecting system, wherein the electric energy grid connecting system does not require diversified designs of generation units, and has a smaller size and higher
  • a further object of this invention is to provide an electric energy transmission system and method, which does not require diversifying the design of generation units.
  • An electric energy grid connecting system comprising: N generation units for generating N ACs where N is an integer larger than 1; N rectifiers for translating said N ACs into N DCs; a booster for boosting the DC with a first voltage from the parallel connection of said N DCs to the DC with a second voltage for HVDC transmission; an HVDC transmission link for transmitting the DC with said second voltage; the grid connecting inverter for translating the DC with said second voltage from said HVDC transmission link into a second AC; and an inverter transformer for translating said second AC into the AC meeting said power grid requirements and outputting it to said power grid.
  • the electric energy transmission system comprising: N generation units for generating N ACs where N is an integer larger than 1; N rectifiers for translating said N ACs into N DCs; and a booster for boosting the DC with a first voltage from the parallel connection of said N DCs to the DC with a second voltage for HVDC
  • An electric energy transmission method comprising: translating the N ACs generated from the N generation units into N DCs where N is an integer larger than 1; connecting said N DCs in parallel to obtain the DC with the first voltage; boosting said DC with said first voltage DC with the second voltage for HVDC
  • Figure 1 is a schematic diagram showing a conventional electric energy grid connecting system for generating
  • Figure 2 is a schematic diagram showing another conventional electric energy grid connecting system for generating
  • Figure 3 is a schematic diagram showing the electric energy grid connecting system according to one embodiment of this invention .
  • Figure 4 is a schematic diagram showing the booster according to one embodiment of this invention.
  • Figure 5 is a schematic diagram showing the boosting unit according to one embodiment of this invention.
  • Figure 6 shows an example of how the controllable switch device according to one embodiment of this invention works.
  • Figure 7 is a schematic diagram showing the booster according to another embodiment of this invention.
  • FIG 3 is a schematic diagram showing the electric energy grid connecting system according to one embodiment of this invention.
  • the electric energy grid connecting system 30 comprises the offshore electric energy transmission system 300 and the onshore electric energy receiving system 350.
  • the electric energy transmission system 300 comprises the offshore electric energy transmission system 300 and the onshore electric energy receiving system 350.
  • N is an integer larger than 1.
  • N wind power generation units 302 are used to generate N ACs with the wind power on the sea. Wherein, each wind power generation unit of the N wind power generation units 302 generates 1 AC which can be a single-phase AC or multi-phase AC.
  • N rectifiers 306 are used to convert the N ACs generated by the N wind power generation units 302 into N DCs. Wherein, each rectifier of the N rectifiers 306 converts the AC generated by one of the N wind power generation units 302 into a DC, so that the N rectifiers 306 obtain N DCs by conversion .
  • the N capacitors 310 are used to filter the N DCs converted by the N rectifiers 306 to further remove the AC part from the N DCs. Wherein, each of the N capacitors 310 filters one of the N DCs converted by the N rectifiers 306.
  • the filtered N DCs are connected in parallel to form a DC ZL1 with the first voltage.
  • the first voltage is a low voltage .
  • the booster 314 is used to boost the DC ZL1 with the first voltage formed by parallel connection of the filtered N DCs to the DC ZL2 with the second voltage (high voltage DC) for HVDC transmission, and to export the DC ZL2 with the second voltage to the HVDC output link of the electric energy receiving system 350 for transmission.
  • the second voltage is higher than the first voltage.
  • the electric energy receiving system 350 comprises the HVDC transmission link 352, the grid connecting inverter 356 and the inverter transformer 360.
  • the HVDC transmission link 352 transmits the DC ZL2 with the second voltage input from the electric energy transmission system 300.
  • the grid connecting inverter 356 converts the DC ZL2 with the second voltage from the HVDC transmission link 352 into the AC.
  • the grid connecting inverter 356, for example, can be a conventional HVDC voltage source inverter, such as the HVDC light inverter of ABB or the HVDC plus inverter of Siemens.
  • the inverter transformer 360 converts the AC converted by the grid connecting inverter 356 into the AC meeting the
  • the electric energy grid connecting system 30 first, the N ACs generated by the N wind power generation units 302 are converted into N DCs, and then the N DCs are connected in parallel to become a low voltage DC, and then the low voltage DC is boosted to the HVDC for transmitting. Therefore, both the voltage withstand capability and the insulation magnitude to the ground are the same for each of the N wind power generation units 302, and there is no need to diversify the design of the N wind power generation units 302. In addition, the electric energy grid connecting system 30 only requires 4 energy conversions.
  • the electric energy grid connecting system 30 has a smaller size and higher efficiency.
  • FIG 4 is a schematic diagram showing the booster according to one embodiment of this invention.
  • the booster 314 comprises the M boosting stages 410 in cascaded connection and the HVDC loop formed by series connection of M+l filter capacitors 440, wherein M is a positive integer.
  • Each of the M boosting stages 410 in cascaded connection is used to boost the received DC by a preset multiple, wherein the DC received by the first boosting stage of the M boosting stages 410 in cascaded connection is the DC ZL1 with the first voltage, and every boosting stage of the M boosting stages 410 in cascaded connection comprises a boosting unit 412.
  • the two sides of the first filter capacitor of the M+l filter capacitors 440 are separately connected to the positive pole (Vin+) and negative pole (Vin-) of the DC ZL1 with the first voltage, the two sides of each of the M+l filter capacitors 440 with a serial number from 2 to M+l are separately
  • FIG. 5 is a schematic diagram showing the boosting unit according to one embodiment of this invention.
  • the boosting unit 412 comprises the first capacitor CI, the second capacitor C2, the first to the fifth
  • controllable switch devices T1-T5 the inductor LI and the control module KZ .
  • the two sides of the first capacitor CI are separately connected to the positive pole and negative pole of the input of its boosting unit 412.
  • the positive pole and negative pole of the first controllable switch device Tl are separately connected to the positive pole of the input of the boosting unit 412 and the positive pole of the second controllable switch device T2.
  • controllable switch device T2 are separately connected to the negative pole of the first controllable switch device Tl and the negative pole of the input of the boosting unit 412.
  • the positive and negative poles of the third controllable switch device T3 are separately connected to the positive pole of the input of the boosting unit 412 and the positive pole of the fourth controllable switch device T4.
  • controllable switch device T4 are separately connected to the negative pole of the third controllable switch device T3 and the positive pole of the output of the boosting unit 412.
  • the positive and negative poles of the fifth controllable switch device T5 are separately connected to the negative pole of the first controllable switch device Tl and the negative pole of the output of the boosting unit 412.
  • the two sides of the second capacitor C2 are separately connected to the negative pole of the third controllable switch device T3 and to one end of inductor LI, and the other end of inductor LI is connected to the positive pole of the fifth controllable switch device T5, that is, the inductor LI is connected between the positive poles of the second
  • the control module KZ is connected to the control poles of the first to the fifth controllable switch devices T1-T5 to control the first to the fifth controllable switch devices T1-T5, so that the second and the third controllable switch devices T2 and T3 complete the current while the other controllable switch devices break the current in the first time interval si of every work cycle Ts, that the first and the fourth controllable switch devices Tl and T4 complete the current while the other controllable switch devices break the current in the second time interval s2 of every work cycle Ts, and that the fourth and the fifth controllable switch devices T4 and T5 complete the current while the other controllable switch devices break the current in the third time interval s3 of every work cycle Ts, wherein the first time interval si, the second time interval s2 and the third time interval s3 can be the same or different in length.
  • Figure 6 shows an example of how the controllable switch device according to one embodiment of this invention works.
  • the shaded areas indicate that the controllable switch devices make the circuits, and the first time interval si, the second time interval s2 and the third time interval s3 are the same in length.
  • the control module KZ Under the control of the control module KZ, when the second controllable switch device T2 and the third controllable switch device T3 complete the current and the other
  • controllable switch devices break the current, the electric energy will be exchanged between the first capacitor CI and the second capacitor C2; when the first controllable switch device Tl and the fourth controllable switch device T4 complete the current and the other controllable switch devices break the current, the electric energy will be exchanged between the second capacitor C2 and the filter capacitor 440 connected to the positive pole of the input and the output of the boosting stage which the boosting unit 412 belongs to, so that the voltage is boosted; and when the fourth controllable switch device T4 and the fifth
  • controllable switch device T5 complete the current and the other controllable switch devices break the current, the electric energy will be exchanged between the second
  • the boosting units adopt the standardized and modularized design.
  • control mode of in-line hot backup can be adopted to improve reliability of the system and to reduce the amount of maintenance work.
  • each boosting stage comprises only one boosting unit; however, this invention is not limited to that.
  • each boosting stage near the low voltage side can comprise several boosting units that are connected in parallel. Therefore, when the DC with the first voltage has a large current, each boosting stage near the low voltage side can provide
  • FIG. 7 is a schematic diagram showing the booster according to another embodiment of this invention. As shown in Figure 7, the boosting stages closer to the low voltage side have more boosting units, and the boosting stages further away from the low voltage side have less boosting units.
  • the 1 st to the 5 th switch devices T1-T5 are all bidirectional-current switch devices, so that the
  • the 2 nd and the 4 th switch devices T2 and T4 when electric energy is transmitted only from the low voltage side to the high voltage side, can be diodes which allow current to flow in one way only, and their connection method is the same as an anti-parallel diode.
  • control module KZ is connected to the control poles of the 1 st , 3 rd and 5 th controllable switch devices Tl, T3 and T5 to control the 1 st , 3 rd and 5 th
  • controllable switch devices Tl, T3 and T5 so that the 3 rd controllable switch device T3 will complete the current and the other controllable switch devices will break the current in the 1 st time interval si of every work cycle Ts, that the 1 st controllable switch device Tl will complete the current and the other controllable switch devices will break the current in the 2 nd time interval s2 of every work cycle Ts, and that the 5 th controllable switch device T5 will complete the current and the other controllable switch devices will break the current in the 3 rd time interval s3 of every work cycle Ts.
  • the I s and 4 controllable switch devices Tl and T4 will complete the current and the other controllable switch devices will break the current so the electric energy will be exchanged between the 2 nd capacitor C2 and the filter capacitor 440 connected to the positive poles of the input and output of the boosting stage which the boosting unit 412 belongs to, so that the voltage is boosted.
  • the 4 th and 5 th In the 3 rd time interval s3 of every work cycle Ts, the 4 th and 5 th
  • the electric energy transmission system 300 comprises N capacitors 310.
  • this invention is not limited to that. In some other embodiments of this invention, for example, when the N DCs obtained from
  • the boosting unit 412 comprises the inductor LI to limit the charging current of the 2 nd
  • the present invention is not limited to that.
  • the inductor LI can be omitted.
  • the inductor LI is located between the 2 nd capacitor C2 and the 5 th
  • the present invention is not limited to that.
  • the inductor LI can be located in a place other than between the 2 n capacitor C2 and the 5 controllable switch device T5.
  • the inductor LI will consist of the 1 st inductor and the 2 nd inductor, wherein the 1 st inductor is connected between the positive poles of the 1 st capacitor CI and the input of the boosting unit 412, and the 2 nd inductor is connected between the positive poles of the 1 st controllable switch device Tl and the input of the boosting unit 412; alternatively, the 1 st inductor is
  • embodiments can be a gate-turn-off thyristor (GTO) , a giant transistor (GTR) , a vertical metal-oxide-semiconductor field- effect transistor (VMOSFET) , an insulated gate bipolar transistor (IGBT), an integrated gate commutated thyristor (IGCT) , a symmetrical gate commutated thyristor (SGCT) , etc.
  • GTO gate-turn-off thyristor
  • GTR giant transistor
  • VMOSFET vertical metal-oxide-semiconductor field- effect transistor
  • IGBT insulated gate bipolar transistor
  • IGCT integrated gate commutated thyristor
  • SGCT symmetrical gate commutated thyristor
  • the electricity generation units can also be hydropower electric generation units, solar power electric generation units, etc.
  • control module KZ can be implemented by using software or hardware such as an electric circuit.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Inverter Devices (AREA)

Abstract

La présente invention concerne un système de connexion d'un réseau d'énergie électrique, ainsi qu'un système et un procédé de transmission d'énergie électrique, lequel système de transmission d'énergie électrique comprend : N unités de génération pour générer N courants alternatifs (CA), N étant un nombre entier supérieur à 1 ; N redresseurs afin de convertir lesdits N CA en N courants continus (CC) ; et un survolteur afin de survolter le CC ayant une première tension depuis la connexion parallèle desdits N CC vers le CC ayant une seconde tension, afin de transmettre un CC haute tension (CCHT) et d'émettre le CC ayant la seconde tension vers le lien de transmission de CCHT en vue de la transmission. Grâce à ce système de connexion d'un réseau d'énergie électrique et à ce système et ce procédé de transmission d'énergie électrique, il n'est pas nécessaire de diversifier la conception des unités de génération.
PCT/EP2011/051245 2010-01-29 2011-01-28 Système de connexion de réseau d'énergie électrique et système et procédé de transmission d'énergie électrique WO2011092302A2 (fr)

Applications Claiming Priority (2)

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CN201010115367.X 2010-01-29
CN201010115367.XA CN102142688B (zh) 2010-01-29 2010-01-29 电能并网系统以及电能传输系统和方法

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WO2011092302A3 WO2011092302A3 (fr) 2011-10-20

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EP2626972A1 (fr) * 2012-02-13 2013-08-14 GE Energy Power Conversion Technology Ltd Système d'alimentation électrique d'une charge, et centrale de production d'énergie électrique comprenant un tel système
WO2015090936A1 (fr) * 2013-12-20 2015-06-25 Siemens Aktiengesellschaft Centrale électrique
US9407157B2 (en) 2013-09-13 2016-08-02 General Electric Company High voltage DC power conversion system and method of operating the same
CN108875994A (zh) * 2017-12-25 2018-11-23 北京金风科创风电设备有限公司 风电变流器的igbt组合方案的评估方法及装置
JP2019041477A (ja) * 2017-08-24 2019-03-14 三菱重工業株式会社 分散電源システムの制御装置、分散電源システム、分散電源システムの制御方法、及び分散電源システムの制御プログラム

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EP2626972A1 (fr) * 2012-02-13 2013-08-14 GE Energy Power Conversion Technology Ltd Système d'alimentation électrique d'une charge, et centrale de production d'énergie électrique comprenant un tel système
FR2986917A1 (fr) * 2012-02-13 2013-08-16 Converteam Technology Ltd Systeme d'alimentation electrique d'une charge, et centrale de production d'energie electrique comprenant un tel systeme
US9407157B2 (en) 2013-09-13 2016-08-02 General Electric Company High voltage DC power conversion system and method of operating the same
WO2015090936A1 (fr) * 2013-12-20 2015-06-25 Siemens Aktiengesellschaft Centrale électrique
JP2019041477A (ja) * 2017-08-24 2019-03-14 三菱重工業株式会社 分散電源システムの制御装置、分散電源システム、分散電源システムの制御方法、及び分散電源システムの制御プログラム
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CN108875994A (zh) * 2017-12-25 2018-11-23 北京金风科创风电设备有限公司 风电变流器的igbt组合方案的评估方法及装置

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