CN102891498A - Direct-current power transmission system for load lines - Google Patents
Direct-current power transmission system for load lines Download PDFInfo
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- CN102891498A CN102891498A CN2012104292071A CN201210429207A CN102891498A CN 102891498 A CN102891498 A CN 102891498A CN 2012104292071 A CN2012104292071 A CN 2012104292071A CN 201210429207 A CN201210429207 A CN 201210429207A CN 102891498 A CN102891498 A CN 102891498A
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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 direct-current power transmission system for load lines. A current-limiting reactor shows high impedance to higher harmonic waves, so that the higher harmonic waves in alternating current are filtered, and the distortion of the waveform of the alternating current is reduced; a silicon diode group or a three-phase full-wave bridge type pulsating rectifying device is used, so that the rectification effect is good, the harmonic component is less, and the investment is saved; a smoothing reactor filters the alternating current in current after rectification to ensure that the waveform of direct current after rectification is smooth; a direct-current capacitor shows a conducting state to the alternating current and a disconnecting state to the direct current, so that the alternating current can be further filtered; a current changer consists of a high-power insulated gate bipolar transistor (IGBT) with breaking capacity and a diode; a high-pass filter filters out higher harmonic current after current change, so that waveform distortion is reduced; and a current change reactor cancels out the capacitive current generated by an earth capacitor of a cable circuit. By the direct-current power transmission system, direct-current power transmission of the load lines is realized, the transmission capacity of electric energy is improved, and a conducting wire material is saved.
Description
Technical field
The invention belongs to the HVDC Transmission Technology field, relate in particular to a kind of DC transmission system for the load circuit.
Background technology
The total length of load circuit accounts for more than 80% of system's total length in the electric power system, the safe operation of load circuit is to guaranteeing system safety, user's power supply quality is significant, but because the continuous increase of load, a lot of circuits have been in the overload operation state, also have many aging circuits serious, need to improve circuit.
Along with industrialized fast development, the urban power consumption is anxious to be increased, and the circuit corridor is more and more difficult, because the urban distribution network scale is increasing and the access of generation of electricity by new energy, the stability of electrical network is greatly affected simultaneously.
Summary of the invention
The invention provides a kind of DC transmission system for the load circuit, be intended to solve along with industrialized fast development, the urban power consumption is anxious to be increased, the circuit corridor is more and more difficult, simultaneously because the urban distribution network scale is increasing and the access of generation of electricity by new energy, the problem that the stability of electrical network is greatly affected.
The object of the present invention is to provide a kind of DC transmission system for the load circuit, this DC transmission system comprises: AC power, AC load, and this DC transmission system also comprises:
Be connected with the output of AC power, be used for the current limiting reactor of filtering three-phase alternating current high order harmonic component;
Be connected with described current limiting reactor, be used for three-phase alternating current is rectified into galvanic rectifying device;
Be connected with described rectifying device, be used for the DC power transmission line that the direct current that rectifying device is exported is transmitted;
Be connected with the end of described DC power transmission line, be used for the current converter with converting direct-current power into alternating-current power;
Be connected with described current converter, be used for providing inductive current, to offset the converter reactor of the capacitance current that the cable circuit direct-to-ground capacitance produces;
Be connected with described converter reactor, for the higher harmonic current of alternating current after the filtering change of current, reduce the high pass filter of wave distortion.
Further, the head end of described DC power transmission line and end are provided with alternating current are presented conducting state, and direct current is presented off-state, further the direct current capacitor of alternating current in the filtering direct current.
Further, described DC power transmission line can adopt overhead transmission line or direct current cables.
Further, this DC transmission system can select silicon diode group or three-phase full-wave bridge-type pulsation rectifying device to convert alternating current to direct current.
Further, the rectification relevant parameters of described rectifying device is as follows:
Unloaded direct voltage mean value in one-period: U
d=2.34U
2=1.35U
1, U in the formula
2Be rectifier bridge AC phase voltage effective value, U
1For rectifier bridge exchanges the current average that the side line voltage effective value flows through each rectifier diode: I
0=1/3I
d, I in the formula
dBe output DC stream;
High backward voltage: the U that each diode bears
0=2.45U2, ac-side current effective value: U
0=2.45I
d, I
2=0.816I
d, VD mean value ripple factor S=0.0571.
Further, the optional usefulness of this DC transmission system has the high-power insulated gate bipolar transistor IGBT of connecting-disconnecting function and the three-phase full-wave six pulsation bridge-type current converters of silicon diode composition.
DC transmission system for the load circuit provided by the invention, current limiting reactor presents high impedance to high order harmonic component, filtering the high order harmonic component in the alternating current, reduced the wave distortion in the alternating current, by silicon diode group or three-phase full-wave bridge-type pulsation rectifying device, safe and reliable, rectification effect is good, harmonic component is few, investment is saved, alternating current in the electric current after the smoothing reactor filtering rectification, make rectification direct current waveform afterwards more level and smooth, direct current capacitor presents conducting state to interchange, direct current is presented off-state, energy is the filtering alternating current further, current converter is comprised of the high-power insulated gate bipolar transistor IGBT with connecting-disconnecting function and silicon diode, higher harmonic current after the high pass filter filtering change of current, reduced wave distortion, converter reactor has been offset the capacitance current that the cable circuit direct-to-ground capacitance produces, this DC transmission system has realized the direct current transportation of load circuit, has reduced the circuit corridor, has improved the transmission capacity of electric energy, saved conductor material, had stronger propagation and employment and be worth.
Description of drawings
Fig. 1 is the key wiring diagram of the DC transmission system that is used for the load circuit that provides of the embodiment of the invention.
Among the figure: 10, AC power; 11, current limiting reactor; 12, rectifying device; 13, smoothing reactor; 14, DC power transmission line; 15, current converter; 16, converter reactor; 17, AC load; 18, direct current capacitor; 19, high pass filter.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further described in detail.Should be appreciated that specific embodiment described herein only in order to explaining the present invention, and be not used in and limit invention.
Fig. 1 shows the structure of the DC transmission system that is used for the load circuit that the embodiment of the invention provides.For convenience of explanation, only show part related to the present invention.
This DC transmission system comprises: AC power 10, AC load 17, and this DC transmission system also comprises:
Be connected with the output of AC power 10, be used for the current limiting reactor 11 of filtering three-phase alternating current high order harmonic component;
Be connected with current limiting reactor 11, be used for three-phase alternating current is rectified into galvanic rectifying device 12;
Be connected with rectifying device 12, be used for the DC power transmission line 14 that the direct current that rectifying device 12 is exported is transmitted;
Be connected with the end of DC power transmission line 14, be used for the current converter 15 with converting direct-current power into alternating-current power;
Be connected with current converter 15, be used for providing inductive current, to offset the converter reactor 16 of the capacitance current that the cable circuit direct-to-ground capacitance produces;
Be connected with converter reactor 16, for the higher harmonic current of alternating current after the filtering change of current, reduce the high pass filter 19 of wave distortion.
In embodiments of the present invention, the head end of DC power transmission line 14 and end are provided with alternating current are presented conducting state, and direct current is presented off-state, further the direct current capacitor of alternating current in the filtering direct current.
In embodiments of the present invention, DC power transmission line 14 can adopt overhead transmission line or direct current cables.
In embodiments of the present invention, this DC transmission system can select silicon diode group or three-phase full-wave bridge-type pulsation rectifying device 12 to convert alternating current to direct current.
In embodiments of the present invention, the rectification relevant parameters of rectifying device 12 is as follows:
Unloaded direct voltage mean value in one-period: U
d=2.34U
2=1.35U
1, U in the formula
2Be rectifier bridge AC phase voltage effective value, U
1For rectifier bridge exchanges the current average that the side line voltage effective value flows through each rectifier diode: I
0=1/3I
d, I in the formula
dBe output DC stream;
High backward voltage: the U that each diode bears
0=2.45U
2, ac-side current effective value: U
0=2.45I
d, I
2=0.816I
d, VD mean value ripple factor S=0.0571.
In embodiments of the present invention, the optional usefulness of this DC transmission system has the high-power insulated gate bipolar transistor IGBT of connecting-disconnecting function and the three-phase full-wave six pulsation bridge-type current converters 15 of silicon diode composition.
Below in conjunction with drawings and the specific embodiments application principle of the present invention is further described.
As shown in Figure 1, this DC transmission system is connected and composed by rectifying device 12, smoothing reactor 13, direct current capacitor 18, transmission line 14, current converter 15, high pass filter 19, current limiting reactor 11, converter reactor 16.
(1) current limiting reactor 11: the inductive type device, high order harmonic component is presented high impedance, and the high order harmonic component in the energy filtering alternating current reduces wave distortion;
(2) rectifying device 12: because the load circuit only has a power end, the normal condition trend is to flow to load side by power supply, the problem that trend is sent can not appear, so can select silicon diode group or three-phase full-wave bridge-type pulsation rectifying device 12 at current terminal, its effect is rectified into direct current to three-phase alternating current exactly, great advantage is simple and safe reliable, rectification effect is good, harmonic component is few, do not need reactive power compensation can save ac filter and DC filtering device, reduce investment outlay, its rectification relevant parameters is as follows:
Unloaded direct voltage mean value in one-period: U
d=2.34U
2=1.35U
1U in the formula
2Be rectifier bridge AC phase voltage effective value, U
1For rectifier bridge exchanges the side line voltage effective value, flow through the current average of each rectifier diode: I
0=1/3I
d, I in the formula
dBe output DC stream;
High backward voltage: the U that each diode bears
0=2.45U
2
Ac-side current effective value: U
0=2.45I
d, I
2=0.816I
dVD mean value ripple factor S=0.0571.
As seen VD is very level and smooth, and near direct current, smoothing reactor 13 capacity can be selected smaller value.Because silicon controlled rectifier is not adopted in the AC rectification.The commutation process that does not have silicon controlled rectifier, and commutation process is to realize at the line to line fault electric current that rectification becomes the two ends winding by means of converter valve, requires the short-circuit voltage of rectifier transformer higher, should be in 12 ~ 18% scopes.Use uncontrollable three phase full wave rectification that Transformer Short Circuit Impedance is not had special requirement, needn't change transformer, this is transformed into direct current transportation for the basis at original old station is very important, can save huge investment.
(3) smoothing reactor 13 and direct current capacitor 18: smoothing reactor 13 is the inductive type device, and the alternating current in the electric current after the filtering rectification makes rectification direct current waveform afterwards more level and smooth.18 pairs of interchanges of direct current capacitor present conducting state, and direct current is presented off-state, further the filtering alternating current.
(4) current converter 15 usefulness have the high-power insulated gate bipolar transistor IGBT of connecting-disconnecting function and the three-phase full-wave 6 pulsation bridge-type current converters of silicon diode composition, only do the inverter operation at this, and direct current is converted to alternating current.General load station belongs to weak AC system or non-transformer AC system, as the inverter that controllable silicon forms selecting, require load station that the commutation three-phase alternating-current supply is provided, namely load station must have AC power, will debug camera and a large amount of reactive-load compensation equipments as not satisfying the requirements.This will increase investment and maintenance workload, and load station also should have rectifier transformer.Therefore the three-phase full-wave 6 of selecting to be formed by high-power insulated gate bipolar transistor IGBT and the silicon diode bridge-type current converters 15 of pulsing.This device does not need AC system that commutation voltage is provided for from the commutation converter, can move as rectifier, also can be as invertor operation, and when as invertor operation, to AC system, it similarly is a generator.Quick adjustment that can be continuous is meritorious to provide electric energy with load or burden without work for system.
(5) higher harmonic current after the high pass filter 19 filtering changes of current reduces wave distortion.
(6) converter reactor 16 provides inductive current, offsets the capacitance current that the cable circuit direct-to-ground capacitance produces.
Direct current transportation has that the circuit corridor area is little, and transmission capacity is large, saves the advantages such as wire, and the present invention selects suitable device according to the load line feature, can realize direct current transportation in the load circuit, and the occasion that the present invention is fit to is as follows:
(1) is adapted at realizing being transformed into direct current transportation by ac transmission on the old basis of standing;
(2) the offshore platform electrical network is the radioactivity electrical network at present, as changing direct current supply into by Alternating Current Power Supply, takes full advantage of this good conductor of seawater and only can realize direct current supply with an extremely extra large cable as the loop.Can save large quantities of funds and non-ferrous metal;
(3) load point that isolates to a distant place is as sending electricity to marine island.
(4) be difficult to increase the urban distribution network in overhead transmission line corridor, can adopt direct current cables to carry out electric power transfer.
The DC transmission system that is used for the load circuit that the embodiment of the invention provides, 11 pairs of high order harmonic components of current limiting reactor present high impedance, filtering the high order harmonic component in the alternating current, reduced the wave distortion in the alternating current, by silicon diode group or three-phase full-wave bridge-type pulsation rectifying device 12, safe and reliable, rectification effect is good, harmonic component is few, investment is saved, alternating current in the electric current after the smoothing reactor 13 filtering rectifications, make rectification direct current waveform afterwards more level and smooth, 18 pairs of interchanges of direct current capacitor present conducting state, direct current is presented off-state, energy is the filtering alternating current further, current converter 15 is comprised of the high-power insulated gate bipolar transistor IGBT with connecting-disconnecting function and silicon diode, higher harmonic current after the high pass filter 19 filtering changes of current, reduced wave distortion, converter reactor 16 has been offset the capacitance current that the cable circuit direct-to-ground capacitance produces, this DC transmission system has realized the direct current transportation of load circuit, has reduced the circuit corridor, has improved the transmission capacity of electric energy, saved conductor material, had stronger propagation and employment and be worth.
Below only be preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. DC transmission system that is used for the load circuit, this DC transmission system comprises: AC power, AC load is characterized in that this DC transmission system also comprises:
Be connected with the output of AC power, be used for the current limiting reactor of filtering three-phase alternating current high order harmonic component;
Be connected with described current limiting reactor, be used for three-phase alternating current is rectified into galvanic rectifying device;
Be connected with described rectifying device, be used for the DC power transmission line that the direct current that rectifying device is exported is transmitted;
Be connected with the end of described DC power transmission line, be used for the current converter with converting direct-current power into alternating-current power;
Be connected with described current converter, be used for providing inductive current, to offset the converter reactor of the capacitance current that the cable circuit direct-to-ground capacitance produces;
Be connected with described converter reactor, for the higher harmonic current of alternating current after the filtering change of current, reduce the high pass filter of wave distortion.
2. DC transmission system as claimed in claim 1, it is characterized in that, the head end of described DC power transmission line and end are provided with alternating current are presented conducting state, and direct current is presented off-state, further the direct current capacitor of alternating current in the filtering direct current.
3. DC transmission system as claimed in claim 2 is characterized in that, described DC power transmission line can adopt overhead transmission line or direct current cables.
4. DC transmission system as claimed in claim 1 is characterized in that, this DC transmission system can select silicon diode group or three-phase full-wave bridge-type pulsation rectifying device to convert alternating current to direct current.
5. DC transmission system as claimed in claim 4 is characterized in that, the rectification relevant parameters of described rectifying device is as follows:
Unloaded direct voltage mean value in one-period: U
d=2.34U
2=1.35U
1, U in the formula
2Be rectifier bridge AC phase voltage effective value, U
1For rectifier bridge exchanges the current average that the side line voltage effective value flows through each rectifier diode: I
0=1/3I
d, I in the formula
dBe output DC stream;
High backward voltage: the U that each diode bears
0=2.45U
2, ac-side current effective value: U
0=2.45I
d, I
2=0.816I
d, VD mean value ripple factor S=0.0571.
6. DC transmission system as claimed in claim 1 is characterized in that, the optional usefulness of this DC transmission system has the high-power insulated gate bipolar transistor IGBT of connecting-disconnecting function and the three-phase full-wave six pulsation bridge-type current converters of silicon diode composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104292071A CN102891498A (en) | 2012-11-01 | 2012-11-01 | Direct-current power transmission system for load lines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104292071A CN102891498A (en) | 2012-11-01 | 2012-11-01 | Direct-current power transmission system for load lines |
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|---|---|
| CN102891498A true CN102891498A (en) | 2013-01-23 |
Family
ID=47534922
Family Applications (1)
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| CN2012104292071A Pending CN102891498A (en) | 2012-11-01 | 2012-11-01 | Direct-current power transmission system for load lines |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006035018A2 (en) * | 2004-09-27 | 2006-04-06 | Areva T & D Uk Ltd | A direct current power transmission system and associated control method |
| CN101512865A (en) * | 2006-09-29 | 2009-08-19 | Abb技术有限公司 | Transition from AC line to high voltage DC line |
| CN101860037A (en) * | 2010-05-26 | 2010-10-13 | 浙江大学 | Determination method of network side harmonic current of high-voltage direct current power transmission system |
-
2012
- 2012-11-01 CN CN2012104292071A patent/CN102891498A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006035018A2 (en) * | 2004-09-27 | 2006-04-06 | Areva T & D Uk Ltd | A direct current power transmission system and associated control method |
| CN101512865A (en) * | 2006-09-29 | 2009-08-19 | Abb技术有限公司 | Transition from AC line to high voltage DC line |
| CN101860037A (en) * | 2010-05-26 | 2010-10-13 | 浙江大学 | Determination method of network side harmonic current of high-voltage direct current power transmission system |
Non-Patent Citations (1)
| Title |
|---|
| 李华: "柔性直流输电在城市电网中的应用探讨", 《东北电力技术》 * |
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Application publication date: 20130123 |