GB2581079A - Coordinating current stabilizing control with tap changer control - Google Patents

Coordinating current stabilizing control with tap changer control Download PDF

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Publication number
GB2581079A
GB2581079A GB2005787.3A GB202005787A GB2581079A GB 2581079 A GB2581079 A GB 2581079A GB 202005787 A GB202005787 A GB 202005787A GB 2581079 A GB2581079 A GB 2581079A
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United Kingdom
Prior art keywords
control
inverting
current
voltage
converters
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Granted
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GB2005787.3A
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GB202005787D0 (en
GB2581079B (en
Inventor
Toledo Paulo
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Hitachi Energy Ltd
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ABB Power Grids Switzerland AG
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Publication of GB2581079A publication Critical patent/GB2581079A/en
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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
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
    • H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
    • H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/75—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M7/757—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • 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)
  • Inverter Devices (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

In a power transmission system comprising two parallel converters operating as inverters (101a, 101b) at a first end of a dc link (116a, 116b) control units (108, 110a, 110b, 112a, 112b) determine that a first inverter (101a) is to control the dc link voltage,controls the extinction angle of the inverters via tap changer control, controls, based on the extinction angle being in the extinction angle window, the dc voltage of the first inverter, controls the second inverter to follow the voltage of the first inverter, and applies a current stabilizing control scheme on the inverters based on the inverters operating in the extinction angle window.

Claims (15)

CLAIMS l. A method in a power transmission system comprising at least two inverting converters (101a, 101b) connected in parallel at a first end of a direct current, dc, link (n6a, n6b), wherein a first alternating current, ac, power line (104) is connected to the first end of the dc link via a first and a second transformer (106a, 106b) and the inverting converters (101a, 101b), where the turns ratio of the first and second transformers are controllable via tap changer control and the inverting converters are controlled using a characteristic of the relationship between the dc voltage and the dc current, said characteristic (U/I) comprising a first section (Si) where the current is constant for different values of the voltage and a second section (S2) where the dc voltage varies with the dc current;
1. the method being performed in at least one control unit (108, 110a, 110b, 112a, 112b, 114a, 114b) for controlling operation of the dc link and comprising: determining (201) that a first of the inverting converters (101a) is to control the voltage of the dc link and the other (101b) to follow the voltage of the first inverting converter; setting (203) an extinction angle window (yiow - Yhigh) for the inverting converters; controlling (205) the extinction angle of the inverting converters via tap changer control; controlling (207), based on the extinction angle of the inverting converters being in the extinction angle window, the dc voltage of the first inverting converter; controlling the second inverting converter to follow the voltage of the first inverting converter; and applying (209) a current stabilizing control scheme on the inverting converters based on a fulfillment of a control condition that the inverting converters operate in the extinction angle window, said current stabilizing control scheme comprising controlling the extinction angle of the inverting converters in the second section (S2) of said characteristic.
2. A method according to claim l, further comprising setting (204) a voltage control window (Udciow - Udchigh), wherein the control of the dc voltage is made using tap changer control and the current stabilizing control scheme is applied on the inverting converters also based on a fulfilment of a control condition that the dc voltage is in the voltage control window.
3. A method according to claim 1 or 2, wherein the second section of the characteristic comprises a positive slope segment (PS) and a negative slope segment (NS) where the current stabilizing control scheme is applied in the positive slope segment and the negative slope segment is used for constant commutation margin control .
4. A method according to any one of claims 1-3, wherein the power transmission system comprises at least two rectifying converters (102a, 102b) connected in parallel at a second end of the dc link, a second alternating, ac, power line (103) is connected to the second end of the dc link (116a, 116b) via a third and a fourth transformer (105a, 105b) and the rectifying converters (102a, 102b), and the turns ratio of the third and fourth transformers are controllable via tap changer control and further comprising setting (203) a firing angle window (aiow - ahigh) for the rectifying converters (102a, 102b and controlling (205) the firing angle of the rectifying converters via tap changer control, wherein the applying of the current stabilization control scheme is based on a fulfillment of a control condition that the rectifying converters operate in the firing angle window.
5. A method according to any previous claim, wherein the current stabilization control in an inverting converter comprises adjusting the current through the inverting converter based on a difference between a current error in said converter and a current error in the parallel converter, where a current error is the difference between a current order and a measured current.
6. A method according to claim 5, wherein the adjusting of the current comprises applying proportional control on the difference between the current errors.
7. A method according to claim 6, wherein the adjustment is made based on Ay _ Balorder = iy^l lIdown~ I own ) -â (ldpar - Iopar )] Gl .
8. A method according to claim 7, wherein the adjusting of the current comprises applying integrating control on the difference between the current errors in the inverting converter that controls the dc voltage .
9. A power transmission system comprising: a direct current, dc, link (116a, 116b), at least one control unit (108, 110a, 110b, 112a, 112b, 114a, 114b) for controlling operation of the dc link, a first and a second transformer (106a, 106b), and at least two inverting converters (101a, 101b) connected in parallel at a first end of the direct current, dc, link (116a, 116b); wherein a first alternating current, ac, power line (104) is connected to the first end of the dc link via the first and the second transformer (106a, 106b) and the inverting converters (101a, 101b), where the turns ratio of the first and second transformers are controllable via tap changer control and the inverting converters are controlled using a characteristic of the relationship between the dc voltage and the dc current, said characteristic (U/I) comprising a first section (Si) where the current is constant for different values of the voltage and a second section (S2) where the dc voltage varies with the dc current; wherein said at least one control unit (108, 110a, 110b, 112a, 112b) is configured to: determine that a first of the inverting converters (101a) is to control the voltage of the dc link and the other (101b) to follow the voltage of the first inverting converter; set an extinction angle window (yiow - Yhigh) for the inverting converters, control the extinction angle of the inverting converters via tap changer control; control, based on the extinction angle of the inverting converters being in the extinction angle window, the dc voltage of the first inverting converter; control the second inverting converter to follow the voltage of the first inverting converter; and apply a current stabilizing control scheme on the inverting converters based on a fulfilment of a control condition that the inverting converters operate in the extinction angle window, said current stabilizing control scheme comprising controlling the extinction angle of the inverting converters in the second section (S2) of said characteristic.
10. The power transmission system according to claim 9, wherein said at least one control unit is further configured to set a voltage control window (Udciow - Udchigh) for the control voltage, wherein the control of the dc voltage is made using tap changer control and the current stabilizing control scheme is applied on the inverting converters also based on a fulfilment of a control condition that the dc voltage is in the voltage control window .
11. The power transmission system according to claim 9 or 10, wherein the second section of the characteristic comprises a positive slope segment (PS) and a negative slope segment (NS) where the current stabilizing control scheme is applied in the positive slope segment and the negative slope segment is used for constant commutation margin control.
12. The power transmission system according to any one of claims 9 - 11, further comprising a third and a fourth transformer (105a, 105b) and at least two rectifying converters (102a, 102b) connected in parallel at a second end of the dc link, wherein a second alternating, ac, power line (103) is connected to the second end of the dc link (116a, 116b) via the third and fourth transformers (105a, 105b) and the rectifying converters (102a, 102b) , the turns ratio of the third and fourth transformers are controllable via tap changer control, said at least one control unit is further configured to set a firing angle window (aiow - ahigh) for the rectifying converters (102a, 102b) and control the firing angle of the rectifying converters via tap changer control and the applying of the current stabilization control scheme is based on a fulfilment of a control condition that the rectifying converters operate in the firing angle window.
13. The power transmission system according to any of claims 9 - 12, wherein the current stabilization control in an inverting converter comprises adjusting the current through the inverting converter based on a difference between a current error in said converter and a current error in the parallel converter, where a current error is the difference between a current order and a measured current.
14. A converter control system for a power transmission system comprising at least two inverting converters (101a, 101b) connected in parallel at a first end of a direct current, dc, link (116a, 116b), wherein a first alternating current, ac, power line (104) is connected to the first end of the dc link via a first and a second transformer (106a, 106b) and the inverting converters (101a, 101b), where the turns ratio of the first and second transformers are controllable via tap changer control and the inverting converters are controlled using a characteristic of the relationship between the dc voltage and the dc current, said characteristic (U/I) comprising a first section (Si) where the current is constant for different values of the voltage and a second section (S2) where the dc voltage varies with the dc current; the converter control system comprising at least one control unit (108, 110a, 110b, 112a, 112b) configured to: determine that a first of the inverting converters (101a) is to control the voltage of the dc link and the other (101b) to follow the voltage of the first inverting converter; set an extinction angle window (yiow - Yhigh) for the inverting converters, control the extinction angle of the inverting converters via tap changer control; control, based on the extinction angle of the inverting converters being in the extinction angle window, the dc voltage of the first inverting converter; control the second inverting converter to follow the voltage of the first inverting converter via tap changer control; and apply a current stabilizing control scheme on the inverting converters based on a fulfilment of a control condition that the inverting converters operate in the extinction angle window, said current stabilizing control scheme comprising controlling the extinction angle of the inverting converters in the second section (S2) of said characteristic.
15. A computer program product adapted to be executed in a converter control system(io8, 110a, 110b, 112a, 112b, 114a, 114b) in a power transmission system comprising at least two inverting converters (101a, 101b) connected in parallel at a first end of a direct current, dc, link (116a, 116b), wherein a first alternating current, ac, power line (104) is connected to the first end of the dc link via a first and a second transformer (106a, 106b) and the inverting converters (101a, 101b), where the turns ratio of the first and second transformers are controllable via tap changer control and the inverting converters are controlled using a characteristic of the relationship between the dc voltage and the dc current, said characteristic (U/I) comprising a first section (Si) where the current is constant for different values of the voltage and a second section (S2) where the dc voltage varies with the dc current; the computer program product comprising computer-readable means carrying computer program code configured to, when executed in the converter control system, cause the converter control system to: determine that a first of the inverting converters (101a) is to control the voltage of the dc link and the other (101b) to follow the voltage of the first inverting converter; set an extinction angle window (yiow - Yhigh) for the inverting converters, control the extinction angle of the inverting converters via tap changer control; control, based on the extinction angle of the inverting converters being in the extinction angle window, the dc voltage of the first inverting converter; control the second inverting converter to follow the voltage of the first inverting converter; and apply a current stabilizing control scheme on the inverting converters based on a fulfilment of a control condition that the inverting converters operate in the extinction angle window, said current stabilizing control scheme comprising controlling the extinction angle of the inverting converters in the second section (S2) of said characteristic.
GB2005787.3A 2017-10-03 2017-10-03 Coordinating current stabilizing control with tap changer control Active GB2581079B (en)

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PCT/EP2017/075024 WO2019068311A1 (en) 2017-10-03 2017-10-03 Coordinating current stabilizing control with tap changer control

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* Cited by examiner, † Cited by third party
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CN111541261B (en) * 2020-05-11 2022-03-01 国网河北省电力有限公司经济技术研究院 Nonlinear dynamic current deviation control method and device and terminal equipment
CN112968459B (en) * 2021-02-05 2023-05-23 国网山西省电力公司检修分公司 Tap control method based on homopolar converter transformer tap fixed deviation alternating control

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4264951A (en) * 1978-06-14 1981-04-28 Hitachi, Ltd. DC Power transmission control
US5815385A (en) * 1994-05-24 1998-09-29 Asea Brown Boveri Ab Control of an installation for transmission of high-voltage direct current
WO2008036009A1 (en) * 2006-09-18 2008-03-27 Abb Technology Ltd. Hvdc converter
WO2008110211A1 (en) * 2007-03-15 2008-09-18 Abb Technology Ag Method and arrangement to reverse the power flow of a direct current power transmission system
WO2014044293A1 (en) * 2012-09-18 2014-03-27 Abb Technology Ltd Method of controlling a power transmission system and corresponding control system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4308362C1 (en) 1993-03-16 1994-11-03 Siemens Ag Methods and control arrangements for direct current transmission

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4264951A (en) * 1978-06-14 1981-04-28 Hitachi, Ltd. DC Power transmission control
US5815385A (en) * 1994-05-24 1998-09-29 Asea Brown Boveri Ab Control of an installation for transmission of high-voltage direct current
WO2008036009A1 (en) * 2006-09-18 2008-03-27 Abb Technology Ltd. Hvdc converter
WO2008110211A1 (en) * 2007-03-15 2008-09-18 Abb Technology Ag Method and arrangement to reverse the power flow of a direct current power transmission system
WO2014044293A1 (en) * 2012-09-18 2014-03-27 Abb Technology Ltd Method of controlling a power transmission system and corresponding control system

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WO2019068311A1 (en) 2019-04-11
GB202005787D0 (en) 2020-06-03
GB2581079B (en) 2022-05-04

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