CN107611959A - A kind of control method of HVDC electric power system and HVDC electric power system - Google Patents
A kind of control method of HVDC electric power system and HVDC electric power system Download PDFInfo
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- CN107611959A CN107611959A CN201610548268.8A CN201610548268A CN107611959A CN 107611959 A CN107611959 A CN 107611959A CN 201610548268 A CN201610548268 A CN 201610548268A CN 107611959 A CN107611959 A CN 107611959A
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000005540 biological transmission Effects 0.000 claims abstract description 35
- 239000004065 semiconductor Substances 0.000 claims description 23
- 230000005611 electricity Effects 0.000 claims description 16
- 238000012423 maintenance Methods 0.000 claims description 11
- 230000003287 optical effect Effects 0.000 claims description 11
- 239000013307 optical fiber Substances 0.000 claims description 7
- 238000009413 insulation Methods 0.000 claims description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 4
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 4
- 230000001960 triggered effect Effects 0.000 claims description 4
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- 238000004804 winding Methods 0.000 claims description 2
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- 238000005516 engineering process Methods 0.000 abstract description 5
- 230000004888 barrier function Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
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- 238000013461 design Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention discloses a kind of HVDC electric power system and the control method of HVDC electric power system, HVDC electric power system to include：Photovoltaic high potential assembly string；The positive and negative electrode connection of by-pass switch, by-pass switch and photovoltaic module, or by-pass switch are connected with the both positive and negative polarity of photovoltaic module string；Direct current output control device, direct current output control device include dc circuit breaker, and dc circuit breaker is connected with the positive pole and/or negative pole of photovoltaic high potential assembly string；High voltage direct current is converted to alternating current by Inverter Station, Inverter Station；DC transmission line, one end of DC transmission line and the output end of dc circuit breaker connect, and the input of the other end and Inverter Station connects.The cooperation that present system passes through by-pass switch and direct current output control device; solve photovoltaic plant HVDC side switch because of the arc extinguishing problem can not separating brake technology barrier; direct current photovoltaic plant relay protection measure is improved, electrical system is run more secure, reliable.
Description
Technical field
The invention belongs to technical field of HVDC transmission, more particularly to a kind of HVDC electric power system, Yi Jisuo
State the control method of HVDC electric power system.
Background technology
Modern transmission ＆ distribution are electrically still based on ac transmission, but the quality requirements of alternating current are very high, to consider frequency, work(
The problems such as rate factor, harmonic wave, capacitive earth current, line impedance, same period processing, exchange power transmission and distribution start at many aspects
Show limitation.Direct current transmission and distribution technology with its it is exclusive the characteristics of, avoid consider required for alternating current more than many asking
Topic, so direct current transmission and distribution especially D.C. high voltage transmission has obvious cost advantage, it will be sent out in current or even future power network
Wave great function.
It is current build with built HVDC transmission system, be all AC-DC-AC form.DC transmission system master
To include current conversion station (rectification side), DC transmission line, current conversion station (inverter side).The change of current of the usual current conversion station of DC transmission system is set
It is standby to use the high-power thyristor without cut-off current ability.Also a kind of direct current transportation of mode (is also named HVDC Light
Flexible DC power transmission), using novel high-frequency Turn-off semiconductor device (such as IGBT, IGCT, silicon carbide elements) and pulsewidth modulation
(PWM) technology carries out the change of current.
Although direct current transmission and distribution has been paid attention to and developed, current photovoltaic plant electrical power trans mission/distribution system is still photovoltaic
DC inverter boosts grid-connected mode again into alternating current.Consider from the overall situation, i.e., it is this to send out defeated again to user from generating electricity to transmitting electricity
There is investment greatly in power transformation and power distribution mode, technical difficulty is high, and fault rate is high, and loss is big, the problems such as benefit is low.
The content of the invention
The first object of the present invention is to provide a kind of HVDC electric power system, and the second object of the present invention is to provide one kind
The control method of HVDC electric power system, to solve the maintenance of existing HVDC electric power system source and control problem.
In order to realize above-mentioned first purpose, the present invention provides a kind of HVDC electric power system, and it includes：
Photovoltaic high potential assembly string, the photovoltaic high potential assembly string are connect by photovoltaic module series winding and formed, the photovoltaic module string
Connected and formed by photovoltaic module；The photovoltaic module is the solar battery apparatus that direct current electricity output can be provided separately；
By-pass switch, the positive and negative electrode connection of the by-pass switch and photovoltaic module, or the by-pass switch and photovoltaic
The both positive and negative polarity connection of component string；
Direct current output control device, the direct current output control device include dc circuit breaker, the dc circuit breaker with
Positive pole and/or the negative pole connection of photovoltaic high potential assembly string, on-off is connect for control photovoltaic high potential assembly string and extraneous circuit
Open；
High voltage direct current is converted to alternating current by Inverter Station, the Inverter Station；
The output end of DC transmission line, one end of the DC transmission line and dc circuit breaker connects, the other end with it is described
The input connection of Inverter Station.
HVDC electric power system as described above of the invention, further, the photovoltaic module string is connected by photovoltaic module
Form, or the photovoltaic module string is formed by photovoltaic module connection in series-parallel.
HVDC electric power system as described above of the invention, further, the photovoltaic high potential assembly string is by photovoltaic module
String is in series, or the photovoltaic high potential assembly string is formed by photovoltaic module string connection in series-parallel.
HVDC electric power system as described above of the invention, further, the by-pass switch is mechanical switch；It is described
Dc circuit breaker is Turn-off semiconductor device or mechanical switch.
HVDC electric power system of the invention as described above, further, the Turn-off semiconductor device be triode,
Metal-oxide-semiconductor, IGBT, IGCT or silicon carbide elements.
HVDC electric power system as described above of the invention, further, the mechanical switch are with contact contact
Switching device.
HVDC electric power system as described above of the invention, further, the by-pass switch is light-operated normally closed switch, or
Automatically controlled normally closed switch.
HVDC electric power system of the invention as described above, further, the light-operated normally closed switch include optical transmitting set,
Optical fiber, optical pickup apparatus and Turn-off semiconductor device or mechanical switch.
HVDC electric power system of the invention as described above, further, the light-operated normally closed switch include optical transmitting set,
Optical fiber, light-triggered Turn-off semiconductor device can be realized.
HVDC electric power system as described above of the invention, further, the photovoltaic module is arranged on ground by support
Face, and photovoltaic module insulation against ground distance increasing and be gradually increased with corresponding photovoltaic module voltage-to-ground.
HVDC electric power system as described above of the invention, further, the direct current output control device also includes electricity
Flow counnter attack device.
HVDC electric power system as described above of the invention, further, the electric current counnter attack device is high-voltage diode.
HVDC electric power system as described above of the invention, further, the quantity of the photovoltaic high potential assembly string is two
Individual or two or more, different photovoltaic high potential assembly string series, parallel or connection in series-parallel are connected to DC transmission line.
HVDC electric power system as described above of the invention, further, the quantity of the Inverter Station is two or two
More than.
HVDC electric power system as described above of the invention, further, the Inverter Station is provided with maximum power tracing
And controller, exported for electric energy caused by adjusting photovoltaic high potential assembly string with peak power.
HVDC electric power system as described above of the invention, further, in addition to disconnecting switch, the disconnecting switch are used
In the transmission line of electricity of cut-out photovoltaic module string.
In order to realize above-mentioned second purpose, the present invention provides a kind of control method of HVDC electric power system, the height
DC power-supply system is pressed as the HVDC electric power system as described in as above any one；Needing to cut off photovoltaic high potential assembly string
During power output, by-pass switch conducting is controlled first, photovoltaic module or photovoltaic module string is in short-circuit condition；Then control is straight
Breaker is flowed to disconnect.
The control method of HVDC electric power system as described above of the invention, it is preferable that needing photovoltaic high potential assembly
When string carries out power output, by-pass switch conducting is controlled first, photovoltaic module or photovoltaic module string is in short-circuit condition；Then
Control dc circuit breaker closure；Finally by-pass switch is controlled to disconnect.
The control method of HVDC electric power system as described above of the invention, it is preferable that needed in photovoltaic high potential assembly string
When carrying out repair and maintenance, control all by-pass switches to turn on first, photovoltaic module or photovoltaic module string is in short-circuit condition；
Then dc circuit breaker is controlled to disconnect；The positive and negative both ends of photovoltaic module are finally subjected to grounding.
The control method of HVDC electric power system as described above of the invention, it is preferable that in photovoltaic high potential assembly string
When some photovoltaic module string needs maintenance, the by-pass switch of the photovoltaic module string turns on, at the by-pass switch of the photovoltaic module string
In short-circuit condition；Then disconnecting switch corresponding to control disconnects, and the photovoltaic module string is isolated with photovoltaic high potential assembly string；Finally
The positive and negative both ends of photovoltaic module are subjected to grounding.
The beneficial effects of the invention are as follows：
HVDC electric power system of the present invention directly produces high-tension electricity by photovoltaic high potential assembly string, and then remote DC is defeated
Electricity.Compared with traditional Transmission Mode, it is evident that have three features：First, having lacked change of current control and the boosting rectifier control of side, throw
Money cost at least reduces；Second, the presence of no reactive power, improves power transmission efficiency；Third, no vibration frequency, the control of electric energy
System simplifies, and technical difficulty reduces.
By the cooperation of by-pass switch and direct current output control device, solves photovoltaic plant HVDC side switch because of arc extinguishing
Problem and can not separating brake technology barrier, improve direct current photovoltaic plant relay protection measure, make electrical system operation it is safer,
Reliably.
The maintenance safety of photovoltaic module string is convenient, can realize the power-off maintenance of whole power station high pressure photovoltaic module string,
The power-off maintenance of a certain photovoltaic module string can be realized, maintenance mode is versatile and flexible, can adapt to photovoltaic plant stable operation
It is required that.
Photovoltaic generation is dc source in itself, and we can be by photovoltaic DC electricity generation system and DC transmission system knot herein
Conjunction forms distinctive photovoltaic HVDC transmission system or photovoltaic high-voltage dc transmission electric network.Because this mode is in Generation Side
(photovoltaic plant) eliminates the change of current and boosting link, and and can takes full advantage of the advantage of direct current transportation, so in whole hair transmission of electricity
Technical requirements are also reduced with cost of investment is reduced on distribution, the reliability for generating electricity and transmitting electricity is improved and also improves photovoltaic plant
Economic benefit.
Brief description of the drawings
By the detailed description made in conjunction with the following drawings, above-mentioned and/or other aspects of the invention and advantage will become
Becoming apparent from and be easier to understand, these accompanying drawings are simply schematical, are not intended to limit the present invention, wherein：
Fig. 1 is the photovoltaic high potential assembly string and by-pass switch connection diagram of an embodiment of the present invention；
Fig. 2 is the HVDC electric power system schematic diagram of the first embodiment of the invention；
Fig. 3 is the HVDC electric power system schematic diagram of second of embodiment of the invention；
Fig. 4 is the HVDC electric power system schematic diagram of the third embodiment of the invention；
Fig. 5 is the HVDC electric power system schematic diagram of the 4th kind of embodiment of the invention；
Fig. 6 is the HVDC electric power system schematic diagram of the 5th kind of embodiment of the invention；
Fig. 7 is the close-up schematic view at A positions in Fig. 1.
Embodiment
Hereinafter, the HVDC electric power system of the present invention and its embodiment of control method are described with reference to the accompanying drawings.
The embodiment recorded herein is specific embodiment of the invention, for illustrating the design of the present invention,
It is explanatory and exemplary, should not be construed as the limitation to embodiment of the present invention and the scope of the invention.Except what is recorded herein
Outside embodiment, those skilled in the art can also be based on the application claims and specification disclosure of that using aobvious and
The other technical schemes being clear to, these technical schemes include any obvious using making for the embodiment to recording herein
The technical scheme of substitutions and modifications.
The accompanying drawing of this specification is schematic diagram, aids in illustrating the design of the present invention, it is schematically indicated the shape of each several part
And its correlation.It note that for the ease of clearly showing the structure of each part of the embodiment of the present invention, between each accompanying drawing
Do not drawn according to identical ratio.Identical reference marker is used to represent identical part.
The embodiment of the present invention provides a kind of HVDC electric power system, and it includes：
Photovoltaic high potential assembly string 1, the photovoltaic high potential assembly string is connected by photovoltaic module string 11 to be formed, the photovoltaic module
String 11, which by photovoltaic module connects 111 and connect, to be formed；The photovoltaic module 111 is the solar cell dress that direct current electricity output can be provided separately
Put；
By-pass switch 12, the by-pass switch 12 are connected with the positive and negative electrode of photovoltaic module 111 and (shown in Fig. 7), or
The by-pass switch 12 is connected with the both positive and negative polarity of photovoltaic module string 11 and (shown in Fig. 1)；Can according to photovoltaic module volt-ampere curve table
Find out its short circuit curve, when the direct short-circuit of photovoltaic module, short circuit current there is no fear of infinity, typically not greater than specified electricity
1.2 times or so of stream, the output of voltage can drop to null value the short time.The component string voltage of many photovoltaic projects is all low at present
Below 1000V is pressed, when the photovoltaic module under the voltage class occurs short-circuit, circuit or photovoltaic cell are not damaged.
Direct current output control device 2, the direct current output control device 2 include dc circuit breaker 21, the direct current interruption
Device 21 is connected with the positive pole and/or negative pole of photovoltaic high potential assembly string 1, for controlling photovoltaic high potential assembly string 1 and extraneous circuit
It is switched on or switched off；
High voltage direct current is converted to alternating current by Inverter Station 4, the Inverter Station 4；
DC transmission line 3, one end of the DC transmission line 3 are connected with the output end of dc circuit breaker 21, the other end with
The input connection of the Inverter Station 4.
In the embodiment shown in fig. 1, the photovoltaic module string 11 is in series by photovoltaic module 111, or described
Photovoltaic module string 11 is formed by the connection in series-parallel of photovoltaic module 111, and the connection in series-parallel refers to include mutually simultaneously in photovoltaic module string 11
The photovoltaic module 111 of connection, also includes the photovoltaic module 111 that is serially connected, in addition to several photovoltaic modulies 111 in parallel and other
The situation that photovoltaic module 111 is connected.
In the embodiment shown in fig. 1, the photovoltaic high potential assembly string 1 is in series by photovoltaic module string 11, or
The photovoltaic high potential assembly string 1 is formed by the connection in series-parallel of photovoltaic module string 11.The connection in series-parallel refers in photovoltaic high potential assembly string 1 i.e.
Including photovoltaic module string 11 parallel with one another, also include the photovoltaic module string 11 being serially connected, in addition to several photovoltaics in parallel
The situation that component string 11 is connected with other photovoltaic module strings 11.
In the specific implementation process of the above embodiment of the present invention, the by-pass switch 12 is to include turn-off semiconductor device
The switch or mechanical switch of part；The dc circuit breaker 21 is Turn-off semiconductor device or mechanical switch.Preferable
In embodiment, the Turn-off semiconductor device is triode, metal-oxide-semiconductor, IGBT, IGCT or silicon carbide elements.Preferable real
Apply in example, the mechanical switch is the switching device with contact contact.
A kind of by-pass switch 12 of specific embodiment of the explanation present invention below, the by-pass switch 12 normally closed are opened to be light-operated
Close, or automatically controlled normally closed switch.The light-operated normally closed switch includes optical transmitting set, optical fiber, optical pickup apparatus and turn-off semiconductor
Device or mechanical switch.Or the light-operated normally closed switch includes optical transmitting set, optical fiber, can realize light-triggered turn off
Semiconductor devices.The by-pass switch of light-operated mode, optical signal is transferred to light-receiving by optical fiber or light guide by optical transmitting set and filled
Put, optical pickup apparatus control Turn-off semiconductor device or mechanical switch, make switch open circuit or path.Light can not also be passed through
Reception device and direct optical signal, which are transferred to, can realize light-triggered Turn-off semiconductor device, make semiconductor devices breaking or logical
Road.
The by-pass switch of automatically controlled mode, electric signal are transferred to signal receiving device, signal receiving device by controlling cable
Turn-off semiconductor device or mechanical switch are controlled, makes switch open circuit or path.Can not also by signal receiving device and
The Turn-off semiconductor device of straight contact point signal triggering, makes semiconductor devices open circuit or path.
In the HVDC electric power system of the above embodiment of the present invention, the photovoltaic module 111 is arranged on by support
Ground, and the insulation against ground distance of photovoltaic module 111 increasing and be gradually increased with corresponding photovoltaic module voltage-to-ground.Utilize
The mode at interval is incrementally increased, reduces the high insulating requirements of itself of photovoltaic module.In this way, such as multiple photovoltaic groups
Although the rated voltage of the D.C. high voltage transmission of part composition is very high, each photovoltaic module need not be by direct current transportation rated voltage
The class of insulation be designed.Solves the photovoltaic module high-voltage isulation problem of photovoltaic generating system.
In HVDC electric power system as described above of the invention, the direct current output control device 2 also includes electric current
Counnter attack device 22.The effect of counnter attack device 22 is both positive and negative polarity reversal connection or the outlet side for preventing the outlet side because of high pressure photovoltaic module string 1
Outside other reasonses caused by pressure difference be present between current flowing backwards, or each branch road of HVDC transmission system and produce electric current
Send, i.e. circulation, and burn the device of high pressure photovoltaic module string or make some devices can not normal operation.When place high potential assembly
When string breaks down, as a cut-off point, it is effectively isolated with system, while failure group string is protected, to overhaul provider
Just.Counnter attack device can use the high pressure counnter attack diode with unilateral conduction, electric current (power) can also be used inversely to examine
Survey and the device of electric current can be blocked rapidly.
In the HVDC electric power system of the above embodiment of the present invention, as shown in figure 1, also including disconnecting switch 13, institute
State the transmission line of electricity that disconnecting switch 13 is used to cut off photovoltaic module string 11.
As shown in Fig. 2 being a kind of HVDC electric power system of embodiment, the system only includes a photovoltaic high potential assembly
String 1, and it is provided with an Inverter Station 4 in output end.
As shown in figure 3, be the HVDC electric power system of another embodiment, the system only include two or two with
On photovoltaic high potential assembly string 1, be mutually connected in series between photovoltaic high potential assembly string 1, an inversion be provided with output end
Stand 4.
As shown in figure 4, being the HVDC electric power system of the third embodiment, the system only includes two photovoltaic high pressure groups
Part string 1, photovoltaic high potential assembly string 1 is parallel running, and an Inverter Station 4 is provided with output end.
As shown in figure 5, being the HVDC electric power system of the 4th kind of embodiment, the system includes three photovoltaic high potential assemblies
String 1, the 1 existing parallel running of photovoltaic high potential assembly string also has series operation, and an Inverter Station 4 is provided with output end.
As shown in fig. 6, being the HVDC electric power system of the 5th kind of embodiment, the system includes three photovoltaic high potential assemblies
String 1, the 1 existing parallel running of photovoltaic high potential assembly string also has series operation, but is provided with two Inverter Stations 4 in output end, in addition,
Multiple Inverter Stations can also be set according to the actual requirements.In such an embodiment, the HVDC power supply of multiple Inverter Stations is included
System more conforms to actual electric network arrangement, realizes and draws electric energy caused by photovoltaic high potential assembly string in multiple places.
According to the HVDC electric power system of above-described embodiment description, the present invention also provides a kind of HVDC electric power system
Control method, the HVDC electric power system is HVDC electric power system as described in as above any one；
When needing to cut off the power output of photovoltaic high potential assembly string (such as when there is line fault), control bypass first
The conducting of switch 12, makes photovoltaic module 111 or photovoltaic module string 11 be in short-circuit condition；Then control dc circuit breaker 21 disconnects.
When needing photovoltaic high potential assembly string to carry out power output, control by-pass switch 12 to turn on first, make photovoltaic module
Or photovoltaic module string is in short-circuit condition；Then control dc circuit breaker 21 closes；Finally control by-pass switch 12 disconnects.
When photovoltaic high potential assembly string needs to carry out repair and maintenance, control by-pass switch 12 to turn on first, make photovoltaic module
111 or photovoltaic module string 11 be in short-circuit condition；Then control dc circuit breaker 21 disconnects；Finally photovoltaic module by 111 just
Negative both ends carry out grounding, ensure not get an electric shock when maintainer's contact arrangement and circuit.
When some photovoltaic module string in photovoltaic high potential assembly string needs maintenance, the by-pass switch of the photovoltaic module string 11
12 conductings, the by-pass switch of the photovoltaic module string 11 are in short-circuit condition；Then disconnecting switch 21 corresponding to control disconnects, and makes this
Photovoltaic module string 11 is isolated with photovoltaic high potential assembly string 1；The positive and negative both ends of photovoltaic module 111 are finally subjected to grounding.
Each technical characteristic of above-mentioned disclosure is not limited to disclosed and further feature combination, and those skilled in the art are also
Other combinations between each technical characteristic can be carried out according to the purpose of invention, are defined by the purpose for realizing the present invention.
Claims (20)
- A kind of 1. HVDC electric power system, it is characterised in that including：Photovoltaic high potential assembly string, the photovoltaic high potential assembly string are connect by photovoltaic module series winding and formed, and the photovoltaic module string is by light Volt component connects to be formed；The photovoltaic module is the solar battery apparatus that direct current electricity output can be provided separately；By-pass switch, the positive and negative electrode connection of the by-pass switch and photovoltaic module, or the by-pass switch and photovoltaic module The both positive and negative polarity connection of string；Direct current output control device, the direct current output control device include dc circuit breaker, the dc circuit breaker and photovoltaic Positive pole and/or the negative pole connection of high potential assembly string, for controlling being switched on or switched off for photovoltaic high potential assembly string and extraneous circuit；High voltage direct current is converted to alternating current by Inverter Station, the Inverter Station；DC transmission line, one end of the DC transmission line and the output end of dc circuit breaker connect, the other end and the inversion The input connection stood.
- 2. HVDC electric power system according to claim 1, it is characterised in that the photovoltaic module string is by photovoltaic module It is in series, or the photovoltaic module string is formed by photovoltaic module connection in series-parallel.
- 3. HVDC electric power system according to claim 1 or 2, it is characterised in that the photovoltaic high potential assembly string by Photovoltaic module string is in series, or the photovoltaic high potential assembly string is formed by photovoltaic module string connection in series-parallel.
- 4. HVDC electric power system according to claim 1, it is characterised in that the by-pass switch is mechanical open Close；The dc circuit breaker is Turn-off semiconductor device or mechanical switch.
- 5. HVDC electric power system according to claim 4, it is characterised in that the Turn-off semiconductor device is three Pole pipe, metal-oxide-semiconductor, IGBT, IGCT or silicon carbide elements.
- 6. HVDC electric power system according to claim 4, it is characterised in that the mechanical switch is that band contact is touched The switching device of head.
- 7. HVDC electric power system according to claim 1, it is characterised in that the by-pass switch normally closed is opened to be light-operated Close, or automatically controlled normally closed switch.
- 8. HVDC electric power system according to claim 7, it is characterised in that the light-operated normally closed switch is sent out including light Emitter, optical fiber, optical pickup apparatus and Turn-off semiconductor device or mechanical switch.
- 9. HVDC electric power system according to claim 7, it is characterised in that the light-operated normally closed switch is sent out including light Emitter, optical fiber, light-triggered Turn-off semiconductor device can be realized.
- 10. HVDC electric power system according to claim 1, it is characterised in that the photovoltaic module is pacified by support Mounted in ground, and photovoltaic module insulation against ground distance increasing and be gradually increased with corresponding photovoltaic module voltage-to-ground.
- 11. HVDC electric power system according to claim 1, it is characterised in that the direct current output control device is also Including electric current counnter attack device.
- 12. HVDC electric power system according to claim 11, it is characterised in that the electric current counnter attack device is high pressure Diode.
- 13. HVDC electric power system according to claim 1, it is characterised in that the number of the photovoltaic high potential assembly string Measure for two or more, different photovoltaic high potential assembly string series, parallel or connection in series-parallel are connected to DC transmission line.
- 14. the HVDC electric power system according to claim 1 or 13, it is characterised in that the quantity of the Inverter Station is Two or more.
- 15. HVDC electric power system according to claim 1, it is characterised in that the Inverter Station is provided with maximum work Rate is followed the trail of and controller, is exported for electric energy caused by adjusting photovoltaic high potential assembly string with peak power.
- 16. HVDC electric power system according to claim 1, it is characterised in that also including disconnecting switch, the isolation Switch the transmission line of electricity for cutting off photovoltaic module string.
- 17. a kind of control method of HVDC electric power system, it is characterised in that the HVDC electric power system will for right Seek the HVDC electric power system described in any one of 1-16；When needing to cut off the power output of photovoltaic high potential assembly string, first By-pass switch conducting is controlled, photovoltaic module or photovoltaic module string is in short-circuit condition；Then dc circuit breaker is controlled to disconnect.
- 18. the control method of HVDC electric power system according to claim 17, it is characterised in that needing photovoltaic height When pressing component string progress power output, by-pass switch conducting is controlled first, photovoltaic module or photovoltaic module string is in short-circuit shape State；Then dc circuit breaker closure is controlled；Finally by-pass switch is controlled to disconnect.
- 19. the control method of HVDC electric power system according to claim 17, it is characterised in that in photovoltaic high pressure group When part string needs to carry out repair and maintenance, control all by-pass switches to turn on first, photovoltaic module or photovoltaic module string is in short Line state；Then dc circuit breaker is controlled to disconnect；The positive and negative both ends of photovoltaic module are finally subjected to grounding.
- 20. the control method of HVDC electric power system according to claim 17, it is characterised in that photovoltaic high potential assembly When some photovoltaic module string in string needs maintenance, the by-pass switch conducting of the photovoltaic module string, the bypass of the photovoltaic module string Switch is in short-circuit condition；Then disconnecting switch corresponding to control disconnects, make the photovoltaic module string and photovoltaic high potential assembly string every From；The positive and negative both ends of photovoltaic module are finally subjected to grounding.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610548268.8A CN107611959A (en) | 2016-07-12 | 2016-07-12 | A kind of control method of HVDC electric power system and HVDC electric power system |
| CN201620734197.6U CN205901296U (en) | 2016-07-12 | 2016-07-12 | High -voltage direct current power supply system |
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| CN201620734197.6U CN205901296U (en) | 2016-07-12 | 2016-07-12 | High -voltage direct current power supply system |
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| CN111837307A (en) * | 2018-12-28 | 2020-10-27 | 华为技术有限公司 | Photovoltaic direct current breaking device |
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| CN107611959A (en) * | 2016-07-12 | 2018-01-19 | 北京实力源科技开发有限责任公司 | A kind of control method of HVDC electric power system and HVDC electric power system |
| CN108429282B (en) | 2018-03-28 | 2020-11-10 | 阳光电源股份有限公司 | Medium-high voltage photovoltaic power generation system |
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