CN103997054B - A kind of light DC power transmission equipment high voltage direct current lateral capacitance charging method - Google Patents
A kind of light DC power transmission equipment high voltage direct current lateral capacitance charging method Download PDFInfo
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- CN103997054B CN103997054B CN201410238846.9A CN201410238846A CN103997054B CN 103997054 B CN103997054 B CN 103997054B CN 201410238846 A CN201410238846 A CN 201410238846A CN 103997054 B CN103997054 B CN 103997054B
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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]
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Abstract
A kind of light DC power transmission equipment high voltage direct current of the present invention lateral capacitance charging method, the direct current of rectification side or inverter side exports the mode adopting and start step by step, start delay time between each power cell of rectification side cascade is t, each power cell exports and adopts pulse-width modulation PWM technology, and duty ratio is incremented to 1 gradually by 0.High voltage direct current side great instantaneous current can be effectively reduced; especially light DC power transmission equipment is applied to the more severe scene of condition; or DC side is when being provided with lightning arrester on-the-spot; the dc-side short-circuit protective device of light DC power transmission equipment is very necessary; the present invention can turn off direct current when direct current transportation is broken down at DC output side or input side effectively, promotes the security reliability that whole system is run.
Description
Technical field
The present invention relates to HVDC Light, field of power electronics, particularly a kind of light DC power transmission equipment high voltage direct current lateral capacitance charging method.
Background technology
Along with the develop rapidly of power electronic device and control technology, HVDC Light technology is gradually improved, its purposes comprises that long distance passive network power supply, isolated island and offshore drilling platform are powered, new-energy grid-connected and be used for forming multi-terminal direct current transmission system in big city and replace traditional AC distribution net etc., employing direct current transportation is more energy-conservation, consumption reduction, increases economic efficiency.HVDC Light, as a kind of economic, flexible, high-quality power transmission mode, can be applied in remote direct current high tension transmission engineering, will obtain good economy and environmental benefit.
When light DC power transmission equipment is applied to the more severe scene of condition; or DC side is when being provided with lightning arrester on-the-spot; the dc-side short-circuit protective device of light DC power transmission equipment is very necessary; effectively can turn off direct current when direct current transportation is broken down at DC output side or input side, promote the security reliability that whole system is run.Due to the existence of short-circuit protection; after rectification side or inverter side input three-phase alternating current; power cell side band high voltage direct current; inverter side or rectification side power cell voltage are 0V; for reducing high voltage direct current side great instantaneous current, the direct current of rectification side or inverter side exports and adopts Starting mode step by step very important.
Summary of the invention
The object of this invention is to provide a kind of light DC power transmission equipment high voltage direct current lateral capacitance charging method; the direct current of rectification side or inverter side exports the mode adopting and start step by step; high voltage direct current side great instantaneous current can be effectively reduced; especially light DC power transmission equipment is applied to the more severe scene of condition; or DC side is when being provided with lightning arrester on-the-spot, the dc-side short-circuit protective device of light DC power transmission equipment and the selection of DC bus capacitor charging method are very necessary.
For achieving the above object, the present invention is achieved through the following technical solutions:
A kind of light DC power transmission equipment high voltage direct current lateral capacitance charging method, described light DC power transmission equipment is made up of rectification side current conversion station, inverter side current conversion station and direct current transportation cable; Rectification side is input as three-phase alternating voltage, and the phase shifting transformer through rectification side is transformed to n group low-voltage three-phase AC and exports rectification side power cell to; After rectification side power cell adopts three-phase controlled rectification to add direct current capacitor filtering, the series connection of n level rectified power unit DC output side is formed high voltage direct current, transfers to light DC power transmission equipment inverter side current conversion station through direct current cables; The input of inverter side high voltage direct current adopts electric capacity and electric resistance partial pressure, the high voltage direct current of DC bus is divided into n low-voltage direct, for n level converter module is powered, the DC voltage conversion of input is low-voltage three-phase AC voltage by PWM and LC filtering technique by converter module; It is characterized in that:
Described direct current capacitor two ends are provided with the protective device in parallel be made up of two IGBT electronic switch devices in series, during normal work, upper brachium pontis is in opening state, lower brachium pontis is in off state, by the direct voltage of two IGBT electronic switch devices in series intermediate points and DC capacitor negative pole end stable output; The direct current of rectification side exports the mode adopting and start step by step, and the start delay time between each power cell of rectification side cascade is t, and each power cell exports and adopts pulse-width modulation PWM technology, and duty ratio is incremented to 1 gradually by 0.
Compared with prior art, the invention has the beneficial effects as follows:
By the light DC power transmission equipment high voltage direct current lateral capacitance charging that pulse-width modulation PWM control mode is power unit cascade structure; and slowly rise by controlling its capacitance voltage; effectively reliably can solve the key issue of the light DC power transmission equipment high voltage direct current lateral capacitance charging of band dc-side short-circuit protective device, there is comparatively actual engineer applied and be worth.
When light DC power transmission equipment is applied to the more severe scene of condition; or DC side is when being provided with lightning arrester on-the-spot; the dc-side short-circuit protective device of light DC power transmission equipment is very necessary; the present invention can turn off direct current when direct current transportation is broken down at DC output side or input side effectively, promotes the security reliability that whole system is run.Due to the existence of short-circuit protection; after rectification side or inverter side input three-phase alternating current; power cell side band high voltage direct current; inverter side or rectification side power cell voltage are 0V; for reducing high voltage direct current side great instantaneous current, the direct current of rectification side or inverter side exports and adopts Starting mode step by step particularly important.
Accompanying drawing explanation
Fig. 1 is the light direct-current transmission system topology figure of band dc-side short-circuit protective device.
Fig. 2 is PWM driving pulse diagram.
Embodiment
Specific embodiments of the invention are described in detail below in conjunction with accompanying drawing.
A kind of light DC power transmission equipment high voltage direct current lateral capacitance charging method; light DC power transmission equipment is applied to the more severe scene of condition; in DC side, lightning arrester is installed; direct current capacitor two ends are provided with the protective device in parallel be made up of two IGBT electronic switch devices in series; during normal work; upper brachium pontis is in opening state, and lower brachium pontis is in off state, by the direct voltage of two IGBT electronic switch devices in series intermediate points and DC capacitor negative pole end stable output.
Light DC power transmission equipment surveys current conversion station by the identical rectification of structure and inverter side current conversion station forms, and Starting mode can be that rectification side starts converter module or inverter side starts rectified power unit.After described rectification side (inverter side) inputs three-phase alternating current, power cell side band high voltage direct current, inverter side (rectification side) power cell voltage is 0V; For reducing high voltage direct current side great instantaneous current, the direct current of rectification side (inverter side) exports and adopts Starting mode step by step, start delay time between each power cell is t, each power cell exports and adopts pulse-width modulation (PWM) technology, and duty ratio is incremented to 1 gradually by 0.
See Fig. 1; light DC power transmission equipment comprises rectification side current conversion station, inverter side current conversion station and direct current transportation cable composition; wherein rectification side current conversion station is made up of phase shifting transformer, transformer, LC filter circuit, power cell and short-circuit protection, and inverter side current conversion station is made up of short-circuit protection, power cell, LC filter circuit, transformer and phase shifting transformer.
Rectification side current conversion station, phase shifting transformer former limit access high-voltage alternating system, forms low-voltage AC at secondary and sends into power cell; Power cell is the three-phase controlled rectifier circuit rectification of IGBT composition, direct voltage is formed at DC bus capacitor C two ends, DC bus capacitor device C output parallel connection short circuit protective device, i.e. electronic switch device IGBT1 and IGBT2 of two series connection, by the series connection point of electronic switch device IGBT1, IGBT2 and the direct voltage of DC capacitor C negative pole stable output of two series connection; During normal work, IGBT1 is in opening state, and IGBT2 is in off state.
Inverter side current conversion station, direct voltage is added in capacitor two ends by the series connection point of electronic switch device IGBT3, IGBT4, and the controlled inverter circuit of three-phase then through being made up of IGBT is reverse into alternating voltage and exports; During normal work, IGBT3 is in opening state, and IGBT4 is in off state; Direct current input side is cascaded up and is connected with direct current transportation cable again, electric capacity and resistance is adopted all to press the direct voltage making each power cell bear decile, power cell adopts PWM pulse modulation technology by direct voltage inversion output AC electricity, again the ac output end of each power cell is accessed transformer secondary through LC filter circuit, export the required alternating current of user by the transformer of different model.
DC bus capacitor is its DC side energy-storage travelling wave tube, the impulse current that available buffer brachium pontis cut-offs, reduces the voltage harmonic of DC side, and provides voltage support for power cell.
Wherein, the power cell number of rectification side current conversion station and inverter side current conversion station, is determined by the required DC voltage level of user.DC voltage level is higher, and required power cell number is more.
See Fig. 2, be the PWM driving pulse of brachium pontis on short-circuit protection, the cycle is T, and duty ratio successively increases progressively, and each duty ratio duration is nT, is 1 in t2 moment duty ratio;
Described rectification side starts inverter side DC capacitor charging method and comprises the following steps:
Step one: rectification side power cell U
1padopt PWM driving pulse to start brachium pontis IGBT1 on short-circuit protection, DC side output voltage is U
c1, component voltage that inverter side grading resistor R guarantees that each unit is born etc., at t
2the duty ratio of moment PWM driving pulse is 1, now starts U
2p;
Step 2: start remaining element in turn according to step one, each unit starting is t time of delay
2;
Step 3: the voltage at high voltage direct current lateral capacitance two ends grows steadily, and reduces great instantaneous current.
Described inverter side starts rectification side DC capacitor charging method and comprises the following steps:
Step one: inverter side power cell U
1nadopt PWM driving pulse to start brachium pontis IGBT3 on short-circuit protection, DC side output voltage is U
c2, component voltage that rectification side grading resistor R guarantees that each unit is born etc., at t
2the duty ratio of moment PWM driving pulse is 1, now starts U
2n;
Step 2: start remaining element in turn according to step one, each unit starting is t time of delay
2;
Step 3: the voltage at high voltage direct current lateral capacitance two ends grows steadily, and reduces great instantaneous current.
Described DC transmission line, is squeezed into insulating barrier by conductor shield, insulating barrier, insulation screen three layers simultaneously, middle conductor one be aluminium list core conductor, the feature such as there is high strength, environmental protection and conveniently bury.
Claims (1)
1. a light DC power transmission equipment high voltage direct current lateral capacitance charging method, described light DC power transmission equipment is made up of rectification side current conversion station, inverter side current conversion station and direct current transportation cable; Rectification side is input as three-phase alternating voltage, and the phase shifting transformer through rectification side is transformed to n group low-voltage three-phase AC and exports rectification side power cell to; After rectification side power cell adopts three-phase controlled rectification to add direct current capacitor filtering, the series connection of n level rectified power unit DC output side is formed high voltage direct current, transfers to light DC power transmission equipment inverter side current conversion station through direct current cables; The input of inverter side high voltage direct current adopts electric capacity and electric resistance partial pressure, the high voltage direct current of DC bus is divided into n low-voltage direct, for n level converter module is powered, the DC voltage conversion of input is low-voltage three-phase AC voltage by PWM and LC filtering technique by converter module; It is characterized in that:
Described direct current capacitor two ends are provided with the protective device in parallel be made up of two IGBT electronic switch devices in series, during normal work, upper brachium pontis is in opening state, lower brachium pontis is in off state, by the direct voltage of two IGBT electronic switch devices in series intermediate points and DC capacitor negative pole end stable output; The direct current of rectification side exports the mode adopting and start step by step, and the start delay time between each power cell of rectification side cascade is t, and each power cell exports and adopts pulse-width modulation PWM technology, and duty ratio is incremented to 1 gradually by 0; Described inverter side starts rectification side DC capacitor charging method and comprises the following steps:
Step one: inverter side power cell U
1nadopt PWM driving pulse to start brachium pontis IGBT3 on short-circuit protection, DC side output voltage is U
c2, component voltage that rectification side grading resistor R guarantees that each unit is born etc., at t
2the duty ratio of moment PWM driving pulse is 1, now starts U
2n;
Step 2: start remaining element in turn according to step one, each unit starting is t time of delay
2;
Step 3: the voltage at high voltage direct current lateral capacitance two ends grows steadily, and reduces great instantaneous current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410238846.9A CN103997054B (en) | 2014-05-30 | 2014-05-30 | A kind of light DC power transmission equipment high voltage direct current lateral capacitance charging method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410238846.9A CN103997054B (en) | 2014-05-30 | 2014-05-30 | A kind of light DC power transmission equipment high voltage direct current lateral capacitance charging method |
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| CN103997054A CN103997054A (en) | 2014-08-20 |
| CN103997054B true CN103997054B (en) | 2016-03-09 |
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| CN201410238846.9A Expired - Fee Related CN103997054B (en) | 2014-05-30 | 2014-05-30 | A kind of light DC power transmission equipment high voltage direct current lateral capacitance charging method |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108683204B (en) * | 2018-04-08 | 2020-08-25 | 许继集团有限公司 | Charging method for direct current side short circuit of sub-module hybrid converter |
| CN110048590B (en) * | 2019-02-13 | 2020-03-24 | 阳光电源股份有限公司 | Two-stage power converter and system with lightning protection design |
| CN110112927B (en) * | 2019-05-16 | 2020-10-30 | 中国科学院电工研究所 | Double-port flexible loop closing device for alternating current power grid |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1189235A (en) * | 1997-09-08 | 1999-03-30 | Tokyo Electric Power Co Inc:The | Dc voltage allotment balance controller in self-excited dc power transmission system |
| WO2009110648A1 (en) * | 2008-03-06 | 2009-09-11 | Jun Sung Electronics Co., Ltd | Converter for hvdc |
| CN101741094A (en) * | 2010-01-25 | 2010-06-16 | 株洲变流技术国家工程研究中心有限公司 | Turn-off device-based mobile power transmission device |
| CN102136725A (en) * | 2011-03-02 | 2011-07-27 | 荣信电力电子股份有限公司 | Light direct-current transmission system topology |
-
2014
- 2014-05-30 CN CN201410238846.9A patent/CN103997054B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1189235A (en) * | 1997-09-08 | 1999-03-30 | Tokyo Electric Power Co Inc:The | Dc voltage allotment balance controller in self-excited dc power transmission system |
| WO2009110648A1 (en) * | 2008-03-06 | 2009-09-11 | Jun Sung Electronics Co., Ltd | Converter for hvdc |
| CN101741094A (en) * | 2010-01-25 | 2010-06-16 | 株洲变流技术国家工程研究中心有限公司 | Turn-off device-based mobile power transmission device |
| CN102136725A (en) * | 2011-03-02 | 2011-07-27 | 荣信电力电子股份有限公司 | Light direct-current transmission system topology |
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| CN103997054A (en) | 2014-08-20 |
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Address after: 550002 Jiefang Road, Nanming, Guizhou, No. 251, Patentee after: Guizhou Electric Power Test Research Institute Patentee after: MONTNETS RONGXIN TECHNOLOGY GROUP CO.,LTD. Address before: 550002 Jiefang Road, Nanming, Guizhou, No. 251, Patentee before: Guizhou Electric Power Test Research Institute Patentee before: RONGXIN POWER ELECTRONIC Co.,Ltd. |
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| TR01 | Transfer of patent right |
Effective date of registration: 20161028 Address after: 550002 Jiefang Road, Nanming, Guizhou, No. 251, Patentee after: Guizhou Electric Power Test Research Institute Patentee after: RONGXIN POWER ELECTRONIC Co.,Ltd. Address before: 550002 Jiefang Road, Nanming, Guizhou, No. 251, Patentee before: Guizhou Electric Power Test Research Institute Patentee before: RONGXIN POWER ELECTRONIC Co.,Ltd. Patentee before: LIAONING RONGXIN ZHONGTENG TECHNOLOGY Co.,Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160309 Termination date: 20170530 |
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| CF01 | Termination of patent right due to non-payment of annual fee |