CN105305407B - A kind of photovoltaic HVDC transmission system - Google Patents
A kind of photovoltaic HVDC transmission system Download PDFInfo
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- CN105305407B CN105305407B CN201510696953.0A CN201510696953A CN105305407B CN 105305407 B CN105305407 B CN 105305407B CN 201510696953 A CN201510696953 A CN 201510696953A CN 105305407 B CN105305407 B CN 105305407B
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Abstract
A kind of photovoltaic HVDC transmission system, including at least 2 photovoltaic generation units and 1 hot standby generator unit of photovoltaic.It connects between the photovoltaic generation unit of 2 or more, and it is connected in series with the outlet side of the hot standby generator unit of photovoltaic (15), then access HVDC transmission line (16), the outlet side of HVDC transmission line (16) is connect with the input side of high-voltage inverter (17), high-voltage inverter (17) exports high pressure three-phase alternating current, it is incorporated to ac high-voltage power grid (18), the low voltage isolation switch input side of multiple photovoltaic generation units and the hot standby generator unit of photovoltaic (15) is connected in parallel by photovoltaic input side parallel connection interconnection (110)；The system controller (19) is connect by signal wire with the inverter controller of photovoltaic generation unit and the hot standby generator unit of photovoltaic, for the control to photovoltaic generation unit and the hot standby generator unit of photovoltaic；The high-voltage inverter (17) is using modular multilevel topological structure.
Description
Technical field
The present invention relates to a kind of photovoltaic power generation equipments to access HVDC transmission system.
Background technology
The energy plays an important role in modern society, be the foundation stone depended on for existence and development of modern society it
One and International Politics at present, economic focal issue.Energy problem is related to International Politics wind and cloud, is related to the warp of country
Ji social development.Fossil energy is substituted using renewable energy power generation, is the general choice of current various countries.Photovoltaic generation is used as can
The important form of renewable source of energy generation, due to it is clean, environmental protection, Land use systems are flexible the characteristics of, more and more paid attention to,
Its installed capacity rapidly develops at home.
Common photovoltaic generating system and web form are to be incorporated to based on AC network.And current domestic flexible direct current and tradition
Direct current transportation is fast-developing, and demonstrative project is more and more, and photovoltaic generation must have the ability of access high-voltage dc transmission power grid.
Common photovoltaic DC converter is relatively low there are output voltage, and the problem of be difficult to disposably boost to very high voltage,
In order to realize that photovoltaic system output is incorporated to high-voltage direct current power grid, multiple photovoltaic DC converter inputs is generally taken to connect independence at present
Photovoltaic module, the mode for exporting series connection improve the output voltage of system, so as to reach output more High Level DC Voltage so as to access height
Press the purpose of DC grid.The country has more document and patent to be illustrated the program at present.
204103503 U of CN propose a kind of connect by photovoltaic generation unit output and access mesohigh straight-flow system
Scheme, but the input terminal of each output tandem photovoltaic generator unit is respectively independent in scheme, it is difficult to realize that power coordination exports,
And the coordination control strategy of each photovoltaic generation unit is not provided, simultaneously because the output series connection of multiple photovoltaic generation units is as all the way
Generator unit goes wrong, then whole system can not must be shut down.
201310244951.9 a kind of photovoltaic DC transmission system of similar modular multi-level converter structure is proposed,
But its DC converting and power cell are non-isolated topology, can not realize secured electrical between high voltage power transmission and photovoltaic module every
From and due to the presence of redundant module, the corresponding photovoltaic module of redundant module can not realize power output during non-faulting, during failure
Single photovoltaic generation unit is isolated, and photovoltaic module can not realize power output, reduces the utilization rate of photovoltaic module.
204068816 U of CN, it is proposed that a kind of method that output voltage is improved using block coupled in series, specially multiple electricity
The output terminal of pressure modular converter is in series successively forms photovoltaic plant, and high straightening is used as after the output terminal parallel connection of multiple photovoltaic plants
Flow the input terminal of transmission of electricity.And it proposes a kind of topological project of voltage transformation module.But the invention still has single module
System will be unable to the problem of operation, and used control method when not illustrating using the program when something goes wrong.
In the such scheme and patent that propose at present, for the detailed embodiment party of photovoltaic DC converter output series topology
Case is expounded.But there are problems that in the program：
1. input is independent, in the photovoltaic DC converter connection topology of output series connection, since photovoltaic DC converter connects
Photovoltaic module it is different, input power fluctuation is larger to lead to the variation of its output voltage greatly, it is necessary to strictly control multiple photovoltaics straight
Current converter output voltage is pressed, and such control algolithm is complicated, and reliability is relatively low.
2. the output of photovoltaic DC converter is is connected in series with, modules flow through identical grid-connected current, when some mould
When block breaks down, whole system will be unable to run, and reduce the reliability of the system.When malfunctioning module is cut off, while the mould
The photovoltaic module of block connection is also removed, and is reduced the utilization rate of photovoltaic module, is reduced the photovoltaic power generation quantity in the power station.
3. the system access high-voltage direct current power grid, voltage is generally more than 10kV, and the pressure resistance one over the ground of photovoltaic module
As for 1kV or 1.5kV, in order to ensure the personal safety of the equipment safety of photovoltaic module and component maintenance personnel, it is necessary to by direct current
The high-pressure system and low-pressure system of converter both sides are isolated.
Invention content
The present invention seeks to overcome the photovoltaic HVDC transmission system control of prior art output series topology it is complicated, can
By property it is low, easily to low-pressure system introduce high pressure the problem of, propose a kind of photovoltaic HVDC transmission system.
The technical solution adopted in the present invention is as follows：
Photovoltaic HVDC transmission system of the present invention includes photovoltaic generation unit, the hot standby generator unit of photovoltaic, photovoltaic input
Side parallel connection interconnection, system controller, HVDC transmission line and high-voltage inverter.The photovoltaic generation unit and light
Latent heat preparation electric unit outlet side is connected in parallel, and is then connected HVDC transmission line, is led in ultra-high-tension power transmission line opposite side
It is alternating current incoming transport high-voltage fence that high-voltage inverter, which is crossed, by DC power conversion.The photovoltaic generation unit at least uses 2,
The hot standby generator unit of photovoltaic at least uses 1.Connect between multiple photovoltaic generation units, and with the hot standby generator unit of photovoltaic
Outlet side is connected in series with；The system controller is used to carry out all photovoltaic generation units and photovoltaic hot standby generator unit unification
Control；The high-voltage inverter is centralized high-voltage inverter, using modular multilevel topological structure.
Photovoltaic generation unit includes photovoltaic module, photovoltaic MPPT (Maximum Power Point Tracking, maximum work
Rate point tracks) with DC/DC converters, low voltage isolation switch, photovoltaic booster converter and high_voltage isolation by-pass switch.Photovoltaic group
It is suitable between part, photovoltaic MPPT DC/DC converters, low voltage isolation switch, photovoltaic booster converter and high_voltage isolation by-pass switch
Sequence is connected in series with.Photovoltaic generation unit is delivered to outlet side for photovoltaic module to be sent out energy when working normally.
The hot standby generator unit of photovoltaic includes low voltage isolation switch, photovoltaic booster converter and high_voltage isolation by-pass switch.It is low
Sequential series between disconnecting switch, photovoltaic booster converter, high_voltage isolation by-pass switch is pressed to connect；The hot standby generator unit of photovoltaic is used
In after photovoltaic HVDC transmission system of the present invention some photovoltaic generation unit failure removal, under the non-stop-machine state of system
It puts into operation, so as to improve the reliability of photovoltaic HVDC transmission system of the present invention.Photovoltaic generation unit and the hot standby hair of photovoltaic
The low voltage isolation switch input side of electric unit is realized in parallel by photovoltaic input side parallel connection interconnection；
Low voltage isolation switch includes a disconnecting switch.The disconnecting switch can be mechanical contactor, breaker,
Can be electronic power switch device, such as IGBT；By unsteady flow when the low voltage isolation switch is used for photovoltaic booster converter failure
Device input side disconnects, and is conveniently replaceable current transformer.
High_voltage isolation by-pass switch includes a fault isolator and a switch failure by-pass, and switch failure by-pass is simultaneously
It is associated in the outlet side of fault isolator；The fault isolator and switch failure by-pass can be mechanical contactor, break
Road device or electronic power switch device, such as IGBT；The high_voltage isolation by-pass switch is for the event of photovoltaic booster converter
Current transformer is bypassed during barrier, and isolating points are formed with high voltage power transmisson system, is conveniently replaceable current transformer.
Photovoltaic MPPT realized with DC/DC converters to the maximal power tracing function of photovoltaic module, and specific topology can be with
For isolated topology or non-isolated topology.The converter can be Boost topology for hicap, so as to
Improving output DC voltage reduces system loss；The converter front end at least connects photovoltaic module all the way, when connection multichannel photovoltaic
Converter includes photovoltaic conflux module during component.
Photovoltaic booster converter topology is necessary for isolated topology and has certain boost capability, the photovoltaic booster converter
Isolating transformer pressure resistance should be DC transmission system maximum voltage；The photovoltaic booster converter further includes a current transformer control
Device processed controls current transformer working condition for the transient process in current transformer disorderly closedown, online input；The photovoltaic boosting
Current transformer is designed for high modularization, is safeguarded by the way of integral replacing when a failure occurs, greatly reduces system dimension
The time is protected, improves system reliability.
The low voltage isolation switch input side of photovoltaic generation unit and the hot standby generator unit of photovoltaic is in parallel using photovoltaic input side
Interconnection realizes parallel connection, connects so as to fulfill photovoltaic booster converter input side Parallel opertation side, so as to simplify system controlling party
Case.
System controller is to all photovoltaic generation units and the hot standby generator unit of photovoltaic using unified Duty ratio control；System
Controller at least acquires high-voltage direct current power grid grid-connected current, after generating algorithm operation according to unified duty ratio in normal operation,
Duty cycle signals are exported to inverter controller, the current transformer of photovoltaic generation unit is run according to duty cycle signals, photovoltaic hair
The current transformer of electric unit only receives duty cycle signals without running, in hot standby state.
When the photovoltaic booster converter failure of a certain photovoltaic generation unit, system controller sends out control signal, bypass
The photovoltaic generation unit to break down, and start the hot standby generator unit of photovoltaic, its output voltage is made to reach equal voltage levels, realization pair
The energy output of failure photovoltaic generation unit front end photovoltaic module, makes full use of photovoltaic module generated energy；Subsequent system controller
Signal is sent out to the low voltage isolation switch and high voltage isolator of failure photovoltaic generation unit, by failure photovoltaic booster converter every
From can be safeguarded or be repaired.
The quantity of the hot standby generator unit of photovoltaic according to the quantity and failure-frequency of photovoltaic generation unit to integrate determining, failure
Then hot standby generator unit quantity is more after photovoltaic for frequency height；The selection of photovoltaic input side parallel connection interconnection cable cross-sections and photovoltaic are hot standby
Generator unit quantity is related, and the area of section of photovoltaic input side parallel connection interconnection cable can be according to the maximum current and connection that it is flowed through
Winding thread cable type determines jointly, and the maximum current that when failure flows through photovoltaic input side parallel connection interconnection meets equation below：
Wherein P is the power of photovoltaic generation unit, and U is the voltage of photovoltaic input side parallel connection interconnection, and m is the hot standby hair of photovoltaic
The quantity of electric unit, I flow through the maximum current of the hot standby generator unit of photovoltaic when being failure.
The hot standby generator unit of photovoltaic generation unit, photovoltaic, system controller, photovoltaic input side parallel connection interconnection composition are all the way
The hot standby generator unit outlet side series connection of outlet side and photovoltaic of photovoltaic DC high voltage power generation unit, wherein photovoltaic generation unit, light
Photovoltaic generation unit and the hot standby generator unit low voltage isolation switch input side of photovoltaic are together in parallel by volt input side parallel connection interconnection,
System controller controls low voltage isolation switch and high_voltage isolation by-pass switch, output control signal to control by output action signal
Inverter controller.Photovoltaic HVDC transmission system of the present invention, can according to grid connection capacity and the capacity of direct current high tension transmission net
Multichannel photovoltaic DC high voltage power generation unit independent of each other is designed with, multichannel photovoltaic DC high voltage power generation unit independent of each other
Output-parallel is connected in direct current high tension transmission net.
Beneficial effects of the present invention：
1. for traditional output tandem photovoltaic generator unit, the present invention in low voltage isolation switch front end by increasing by one
Photovoltaic input side parallel connection interconnection, so as to achieve the purpose that balanced each photovoltaic booster converter input power, so as to greatly simplify
The control mode of photovoltaic booster converter, while power equalization is carried out using interconnection and is avoided because direct current junction electric current is excessive
Caused loss problems of too, improves system effectiveness.
2. the present invention is equipped with the hot standby generator unit of photovoltaic, normal operation time except conventional photovoltaic generator unit
Latent heat preparation electric unit access system but transimission power is not run, when certain photovoltaic generation unit failure is out of service, this is hot standby
Unit puts into operation, and the electric energy of its front end photovoltaic module is taken over by interconnection, and high-voltage direct current power grid is incorporated to after being converted.It is real
Show system and do not shut down the hot standby generator unit of input, substantially increase system reliability.
3. the present invention increases disconnecting switch in photovoltaic booster converter low pressure side and high pressure side, guarantee can not stop in system
Malfunctioning module is cut off in the case of machine, and electrical isolation is formed with operating system, module is facilitated to remove repair and maintenance.
Description of the drawings
Fig. 1 is the system schema topological diagram of the embodiment of the present invention；
In figure：11 first photovoltaic generation units, 12 second photovoltaic generation units, 13 (n-1)th photovoltaic generation unit n-1,14
N-th photovoltaic generation unit n, the hot standby generator unit of 15 photovoltaics, 16 HVDC transmission lines, 17 high-voltage inverters, 18 exchanges are high
Voltage electric grid, 19 system controllers, 110 photovoltaic input side parallel connection interconnections.
Fig. 2 is the structure chart of photovoltaic generation unit of the embodiment of the present invention；
In figure：21 photovoltaic modulies, 22 photovoltaic MPPT DC/DC converters, 23 low voltage isolation switchs, 24 photovoltaics boosting unsteady flow
Device, 25 high_voltage isolation by-pass switches, 26 inverter controllers；
Fig. 3 is the hot standby generator unit structure chart of photovoltaic of the embodiment of the present invention,
In figure：23 low voltage isolation switchs, 24 photovoltaic booster converters, 25 high_voltage isolation by-pass switches, the control of 26 current transformers
Device.
Fig. 4 is low voltage isolation switch structure chart of the embodiment of the present invention；
Fig. 5 is high_voltage isolation by-pass switch structure chart of the embodiment of the present invention,
In figure：QF2 fault isolators, QF3 switch failure by-pass；
Fig. 6 is system controller structure chart of the embodiment of the present invention,
In figure：191 low voltage isolation switch action signals, 192 photovoltaic generation units and the hot standby generator unit of photovoltaic uniformly account for
Sky is than signal, 193 high_voltage isolation by-pass switch action signals, 194 photovoltaic generation unit output electric current measure signals.
Specific embodiment
It is further illustrated the present invention below in conjunction with the drawings and specific embodiments.
Fig. 1 is topological diagram of the embodiment of the present invention.As shown in Figure 1, photovoltaic HVDC transmission system of the present invention includes first
Photovoltaic generation unit 11, the second photovoltaic generation unit 12, the (n-1)th photovoltaic generation unit 13, the n-th photovoltaic generation unit 14, photovoltaic
Generate electricity hot standby unit 15, photovoltaic input side parallel connection interconnection 110, system controller 19, HVDC transmission line 16, Yi Jigao
Press inverter 17.Photovoltaic generation unit is at least using n in the present embodiment, and n is integer, n ＞ 1, and the hot standby generator unit of photovoltaic is adopted
With 1；It is one another in series between n photovoltaic generation unit, and is connected in series with the hot standby generator unit outlet side of photovoltaic, then accessed
HVDC transmission line 16, the outlet side of HVDC transmission line 16 are connect with the input side of high-voltage inverter 17, high pressure
Inverter 17 exports high pressure three-phase alternating current, is incorporated to ac high-voltage power grid 18, and n photovoltaic generation unit and the hot standby power generation of photovoltaic are single
The low voltage isolation switch input side of member is connected in parallel by photovoltaic input side parallel connection interconnection 110.The system control
For device 19 for being uniformly controlled to all photovoltaic generation units and the hot standby generator unit of photovoltaic, which includes at least three
Output signal, an input signal, three output signals are respectively low voltage isolation switch action signal 191, photovoltaic generation unit
And the hot standby generator unit of photovoltaic unifies duty cycle signals 192, high_voltage isolation by-pass switch action signal 193, input signal is light
Lie prostrate generator unit output electric current measure signal 194.The high-voltage inverter 17 is centralized configuration, is opened up using modular multilevel
Flutter structure.
Fig. 2 is the structure chart of photovoltaic generation unit of the embodiment of the present invention.As shown in Fig. 2, photovoltaic generation unit includes photovoltaic
Component 21, photovoltaic MPPT DC/DC converters 22, low voltage isolation switch 23, photovoltaic booster converter 24, high_voltage isolation bypass are opened
Close 25；The input side of the output connection photovoltaic MPPT DC/DC converters 22 of photovoltaic module 21, photovoltaic MPPT are converted with DC/DC
One end of the outlet side connection low voltage isolation switch 23 of device 22, the other end connection photovoltaic booster converter of low voltage isolation switch 23
24 input side, the outlet side of photovoltaic booster converter 24 are connected in series with high_voltage isolation by-pass switch 25, and high_voltage isolation bypass is opened
The outlet side that 25 outlet sides form photovoltaic generation unit is closed, inverter controller 26 is integrated into one with photovoltaic booster converter 24
Body.
Photovoltaic MPPT realizes the maximal power tracing function to photovoltaic module with DC/DC converters 22, and specific topology can
It may be non-isolated topology to think isolated topology；The photovoltaic MPPT with DC/DC converters 22 for hicap, can be with
For Boost topology, system loss is reduced so as to improve output DC voltage；The photovoltaic MPPT DC/DC converters 22
Front end is at least connected with photovoltaic module all the way, and photovoltaic MPPT DC/DC converters include photovoltaic and converge when connecting multichannel photovoltaic module
Flow module.
Fig. 3 is the hot standby generator unit structure chart of photovoltaic of the embodiment of the present invention.As shown in figure 3, the hot standby generator unit 15 of photovoltaic
Include low voltage isolation switch 23, photovoltaic booster converter 24, high_voltage isolation by-pass switch 25, inverter controller 26.Above-mentioned member
Part sequential series connect.
The hot standby generator unit 15 of photovoltaic forms photovoltaic generation unit hot standby.It is out of service for photovoltaic generation unit failure
When, the photovoltaic module of photovoltaic generation unit front end out of service is taken over, is imported after the transformation of electrical energy that photovoltaic module is sent out straight
Flow high-voltage fence.
The topology of photovoltaic booster converter 24 is necessary for isolated topology, and has certain boost capability, the photovoltaic boosting
The isolating transformer pressure resistance of current transformer 24 should be DC transmission system maximum voltage；The photovoltaic booster converter further includes one
Inverter controller controls current transformer working condition for the transient process in current transformer disorderly closedown, online input；It is described
Photovoltaic booster converter is designed for high modularization, is safeguarded by the way of integral replacing when a failure occurs, is subtracted significantly
Few system maintenance time, improves system reliability.
Fig. 4 is the structure chart of low voltage isolation switch of the embodiment of the present invention 23.The low voltage isolation switch 23 include one every
It leaves and closes QF1.Fig. 5 is 25 structure chart of high_voltage isolation of embodiment of the present invention by-pass switch.High_voltage isolation by-pass switch 25 includes event
Hinder disconnecting switch QF2 and switch failure by-pass QF3.Disconnecting switch QF1, fault isolator QF2, switch failure by-pass QF3 can
Think mechanical contactor, breaker or electronic power switch device, such as IGBT；It is mechanically isolated from the easy shape of switch
Powered off into machinery, be more conducive to repair and maintenance, the disconnecting switch that power electronic devices is formed, available for cut-out running current or
Equipment circulation, the disconnecting switch that power electronic devices is formed can be used alone, can be also used cooperatively with isolation switch.It is described low
Pressure disconnecting switch 23 is used to disconnect current transformer input side during photovoltaic booster converter failure, is controlled with photovoltaic MPPT with DC/DC
Device 22 forms isolating points, and the switch failure by-pass QF3 is used to bypass current transformer during photovoltaic booster converter failure, the height
Pressure isolation by-pass switch 25 is used to disconnect current transformer outlet side during photovoltaic booster converter failure, is formed with high voltage power transmisson system
Isolating points are conveniently replaceable current transformer.Low voltage isolation switch 23 and high_voltage isolation by-pass switch 25 are used to bypass photovoltaic liter during failure
Volage current transformer, and apparent electrical power-off is formed with front and rear side, facilitate and extract the photovoltaic booster converter of high modularization out dimension
Shield.
Fig. 6 is the structure chart of system controller of the embodiment of the present invention 19.The output signal of system controller 19 mainly has：
191 low voltage isolation switch action signals, 192 photovoltaic generation units and the hot standby generator unit of photovoltaic unify duty cycle signals, and 193 is high
Pressure isolation by-pass switch action signal.The input signal of system controller mainly has 194 photovoltaic generation unit output electric current measures
Signal.System controller 19 is to all photovoltaic generation units and the hot standby generator unit of photovoltaic using unified Duty ratio control；System
Controller 19 at least acquires high-voltage direct current power grid grid-connected current, and algorithm operation is generated according to unified duty ratio in normal operation
Afterwards, duty cycle signals are exported to inverter controller, the current transformer of photovoltaic generation unit is run according to duty cycle signals, photovoltaic
The current transformer of generator unit only receives duty cycle signals without running, in hot standby state.
The low voltage isolation switch input side of photovoltaic generation unit and the hot standby generator unit of photovoltaic is in parallel using photovoltaic input side
Interconnection realizes parallel connection, connects so as to fulfill photovoltaic booster converter input side Parallel opertation side, so as to simplify system controlling party
Case.
When the photovoltaic booster converter failure of a certain photovoltaic generation unit, system controller sends out control signal, bypass
The photovoltaic generation unit to break down, and start the hot standby generator unit of photovoltaic, its output voltage is made to reach equal voltage levels, realization pair
The energy output of failure photovoltaic generation unit front end photovoltaic module, makes full use of photovoltaic module generated energy；Subsequent system controller
Signal is sent out to the low voltage isolation switch and high voltage isolator of failure photovoltaic generation unit, by failure photovoltaic booster converter every
From can be safeguarded or be repaired.
The quantity of the hot standby generator unit of photovoltaic according to the quantity and failure-frequency of photovoltaic generation unit to integrate determining, failure
Then hot standby generator unit quantity is more after photovoltaic for frequency height；The selection of photovoltaic input side parallel connection interconnection cable cross-sections and photovoltaic are hot standby
Generator unit quantity is related, and the area of section of photovoltaic input side parallel connection interconnection can be according to the maximum current and interconnection that it is flowed through
Cable type determines jointly, and the maximum current that when failure flows through photovoltaic input side parallel connection interconnection meets equation below：
Wherein I flows through the maximum current of the hot standby generator unit of photovoltaic when being failure, P is the power of photovoltaic generation unit, and U is
The voltage of photovoltaic input side parallel connection interconnection, m are the quantity of the hot standby generator unit of photovoltaic.
Multiple photovoltaic generation units output of output series connection, the hot standby generator unit output of photovoltaic and system controller output string
Connection, the hot standby generator unit of photovoltaic generation unit, photovoltaic, system controller and photovoltaic input side parallel connection interconnection form photovoltaic all the way
High direct voltage generator unit.Photovoltaic HVDC transmission system of the present invention is according to the appearance of grid connection capacity and direct current high tension transmission net
Amount, can be designed with multichannel photovoltaic DC high voltage power generation unit independent of each other, the output of multichannel photovoltaic DC high voltage power generation unit
Parallel connection is connected in direct current high tension transmission net.
Photovoltaic HVDC transmission system of the present invention, by increasing a photovoltaic input side parallel connection interconnection, so as to reach
The purpose of balanced each photovoltaic booster converter input power, so as to enormously simplify the control mode of photovoltaic booster converter, together
Shi Caiyong interconnections progress power equalization is avoided is lost problems of too caused by direct current junction electric current is excessive, improves system
Efficiency.The present invention is equipped with the hot standby generator unit of photovoltaic, avoids generating electricity caused by part photovoltaic generation unit releases operation
Amount loss, the system that realizes do not shut down the hot standby generator unit of input, substantially increase system reliability, take full advantage of photovoltaic group
Part.The present invention both increases disconnecting switch in booster converter low pressure side and high pressure side, and guarantee can be in the non-stop-machine feelings of system
Malfunctioning module is cut off under condition, and electrical isolation is formed with operating system, module is facilitated to remove repair and maintenance, substantially reduces and is
The power failure maintenance time of system improves system generated energy.
Claims (3)
1. a kind of photovoltaic HVDC transmission system, it is characterised in that：The photovoltaic HVDC transmission system includes photovoltaic
The hot standby generator unit of generator unit, photovoltaic (15), photovoltaic input side parallel connection interconnection (110), system controller (19), high straightening
Flow transmission line of electricity (16) and high-voltage inverter (17)；The photovoltaic generation unit is at least 2, the hot standby generator unit of photovoltaic
(15) 1 is at least used；It connects between the outlet side of the photovoltaic generation unit of 2 or more, and single with the hot standby power generation of photovoltaic
The outlet side of first (15) is connected in series with, and then accesses HVDC transmission line (16), HVDC transmission line (16) it is defeated
The input side for going out side with high-voltage inverter (17) is connect, and it is high to be incorporated to exchange for high-voltage inverter (17) output high pressure three-phase alternating current
The low voltage isolation switch input side of voltage electric grid (18), multiple photovoltaic generation units and the hot standby generator unit of photovoltaic (15) passes through photovoltaic
Input side parallel connection interconnection (110) is connected in parallel；The system controller (19) passes through signal wire and photovoltaic generation list
Member is connected with the inverter controller of the hot standby generator unit of photovoltaic, for photovoltaic generation unit and the hot standby generator unit of photovoltaic
Control；The high-voltage inverter (17) is using modular multilevel topology；
The photovoltaic generation unit includes photovoltaic module (21), photovoltaic MPPT DC/DC converters (22), low voltage isolation switch
(23), photovoltaic booster converter (24) and high_voltage isolation by-pass switch (25)；The output connection photovoltaic MPPT of photovoltaic module (21)
With the input side of DC/DC converters (22), the outlet side connection low voltage isolation switch of photovoltaic MPPT DC/DC converters (22)
(23) one end, the input side of the other end connection photovoltaic booster converter (24) of low voltage isolation switch (23), photovoltaic boosting become
The outlet side of stream device (24) is connected in series with high_voltage isolation by-pass switch (25), and the outlet side of high_voltage isolation by-pass switch (25) is formed
The outlet side of photovoltaic generation unit, inverter controller (26) become one with photovoltaic booster converter (24)；
The photovoltaic booster converter is isolated topology and has boost capability, the isolating transformer of the photovoltaic booster converter
Pressure resistance should be DC transmission system maximum voltage；The inverter controller (26) is in current transformer disorderly closedown, online throwing
Fashionable transient process control current transformer working condition；
The low voltage isolation switch (23) includes a disconnecting switch (QF1)；The disconnecting switch (QF1) is mechanical type contact
Device, breaker or electronic power switch device；When the low voltage isolation switch (23) is for photovoltaic booster converter failure, by light
Booster converter input side is lied prostrate to disconnect；
The high_voltage isolation by-pass switch (25) includes a fault isolator (QF2) and a switch failure by-pass (QF3)；
The fault isolator (QF2) and switch failure by-pass (QF3) are mechanical contactor, breaker or electronic power switch device
Part；The high_voltage isolation by-pass switch (25) during photovoltaic booster converter failure for bypassing current transformer, and and high voltage direct current
Transmission system forms isolating points；
The system controller (19) at least acquires HVDC transmission line electric current, in normal operation according to unified duty ratio
After generating algorithm operation, duty cycle signals are exported to inverter controller, the current transformer of photovoltaic generation unit is according to duty ratio
Signal is run, and the current transformer of the hot standby generator unit of photovoltaic only receives duty cycle signals without running, in hot standby state；
When the photovoltaic booster converter failure of a certain photovoltaic generation unit, system controller (19) sends out control signal, bypass
The photovoltaic generation unit to break down, and start the hot standby generator unit of photovoltaic, its output voltage is made to reach equal voltage levels, realization pair
The energy output of failure photovoltaic generation unit front end photovoltaic module；Subsequent system controller (19) is to failure photovoltaic generation unit
Low voltage isolation switch and high voltage isolator send out signal, and failure photovoltaic booster converter is isolated, is safeguarded or is repaired.
2. photovoltaic HVDC transmission system according to claim 1, it is characterised in that：The hot standby power generation of the photovoltaic is single
First (15) under the non-stop-machine state of system for after some photovoltaic generation unit failure removal, putting into operation.
3. photovoltaic HVDC transmission system according to claim 1 or claim 2, it is characterised in that：The hot standby power generation of the photovoltaic
The quantity of unit (15) determines that then the hot standby power generation of photovoltaic is single for failure-frequency height according to the quantity and failure-frequency of photovoltaic generation unit
First quantity is more；The selection of photovoltaic input side parallel connection interconnection cable cross-sections is related with the quantity of the hot standby generator unit of photovoltaic, photovoltaic
The maximum current and interconnection cable type that the area of section of input side parallel connection interconnection is flowed through according to it determine jointly, during failure
The maximum current for flowing through photovoltaic input side parallel connection interconnection meets equation below：
Wherein P is the power of photovoltaic generation unit, and U is the voltage of photovoltaic input side parallel connection interconnection, and m is single for the hot standby power generation of photovoltaic
The quantity of member, I flow through the maximum current of the hot standby generator unit of photovoltaic when being failure.
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| CN105932662B (en) * | 2016-04-29 | 2019-05-24 | 中国科学院电工研究所 | Large-sized photovoltaic DC series booster system based on N-m equipment redundancy |
| ES2804248T3 (en) * | 2017-03-07 | 2021-02-05 | Marici Holdings The Netherlands Bv | Photovoltaic Power Plant System |
| CN106849679A (en) * | 2017-03-31 | 2017-06-13 | 沈阳工业大学 | For the grid-connected wide range input converting means of distributed power source and method |
| CN107294129A (en) * | 2017-06-22 | 2017-10-24 | 胡炎申 | Battery inversion train and inverter power supply device |
| DE102017210610A1 (en) * | 2017-06-23 | 2018-12-27 | Audi Ag | An electric power supply device having a plurality of exchangeable use units and methods of operating such an energy delivery device |
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| CN108695842A (en) * | 2018-06-15 | 2018-10-23 | 西安交通大学 | A kind of photovoltaic system flexibility suitable for direct current distribution collects topology and its control method |
| CN109004817A (en) * | 2018-07-09 | 2018-12-14 | 许继集团有限公司 | A kind of the starting method and DC boosting system of DC boosting system |
| CN111162681B (en) * | 2018-11-08 | 2021-10-12 | 中车永济电机有限公司 | AC-DC-AC type direct-drive permanent magnet traction converter and control method and system thereof |
| CN110867846B (en) * | 2019-10-25 | 2021-12-17 | 中国科学院电工研究所 | Large-scale photovoltaic direct current series connection boosting grid-connected system with power balancer |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7964991B2 (en) * | 2009-02-20 | 2011-06-21 | The Aerospace Corporation | Converter channelized uniform power distribution system |
| CN203589824U (en) * | 2013-11-20 | 2014-05-07 | 梁一桥 | Renewable energy power generation, power transmission and transformation and power grid access integration system |
-
2015
- 2015-10-23 CN CN201510696953.0A patent/CN105305407B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7964991B2 (en) * | 2009-02-20 | 2011-06-21 | The Aerospace Corporation | Converter channelized uniform power distribution system |
| CN203589824U (en) * | 2013-11-20 | 2014-05-07 | 梁一桥 | Renewable energy power generation, power transmission and transformation and power grid access integration system |
Non-Patent Citations (1)
| Title |
|---|
| "模块化独立光伏储能系统及其控制策略";周毓颖等;《轻工机械》;20130831;第31卷(第4期);第39-42、47页 * |
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