CN207234419U - Looped network of DC power framework based on multiport residents energy source router - Google Patents
Looped network of DC power framework based on multiport residents energy source router Download PDFInfo
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Abstract
It is to overcome the shortcomings of that the prior art is deposited for the purpose of the utility model, proposes the looped network of DC power framework based on multiport residents energy source router, realize framework and the direct current distribution construction of future source of energy internet, prepares for the birth of third generation energy source router.One kind is based on multiport residents energy source router looped network of DC power framework, and equipped with dc bus, looped network is formed by dc bus, and some multiport energy source routers are set on looped network of DC power, block switch is provided between the multiport energy source router of interval.The dc bus is connected to the ac bus of outside by DC/AC transverters.The utility model direct-current grid main advantage concentrates on：The high quality powering solution of customization can be provided；Reduce voltage transformation link, reduce equipment investment and running wastage；Can for it is straight/exchange micro-capacitance sensor provide and network interface, improve that the operational reliability of micro-capacitance sensor can simultaneously meet the harmonic wave control of exchange micro-capacitance sensor, reactive-load compensation and energy is counter send demand.
Description
Technical field
The affiliated field of power electronics of the utility model.
Background technology
With the shortage of fossil fuel, environmental pollution getting worse, the domestic demand for renewable energy power generation is progressively
Increase.And such as typical photovoltaic distributed power generation and the power generation of wind distribution formula with fluctuation and randomness, it is necessary to configure
Energy-storage units stabilizing system fluctuates.
First generation inversion system, in order to realize the configuration of the minimum system of photovoltaic+energy storage, it is necessary to which photovoltaic DC-to-AC converter is inverse with energy storage
Become the combination of device；Second generation inversion system, it is proposed that light stores up all-in-one machine, can access photovoltaic and energy-storage units at the same time.
On the other hand, increasing with DC load, traditional exchange micro-capacitance sensor has problems to highlight, such as：
A) change of current loss and the increase of change of current cost caused by DC load access；
B) high permeability, a large amount of distributed generation resources, energy-accumulating power station etc. while the stationary problem of incoming transport system；
C) the grid-connected frequency that need to be considered and phase problem are exchanged；
D) voltage dip and power supply short interruptions problem；
E) voltage source converter is idle in circuit and the problems such as harmonic wave.
Utility model content
Third generation inverter system in prospect.Third generation inverter system is envisioned for the energy source router system of multiport
System, in addition to photovoltaic, energy-storage system, can consider wind generator system, hydrogen fuel cell at the same time.Become at the same time by energy supply form
The influence of change, the one-way flow of electric energy just changes towards the mode of two-way flow, and first, second traditional generation inverter system
It can not meet power-supplying forms diversity, energy two-way flow, and the requirement such as active control of power flow
It is to overcome the shortcomings of that the prior art is deposited for the purpose of the utility model, proposition is based on multiport residents energy source routing
The looped network of DC power framework of device, realizes framework and the direct current distribution construction of future source of energy internet, is third generation energy source router
Birth prepare.
The utility model needs technical solution to be protected to be characterized as：
A kind of looped network of DC power framework based on multiport residents energy source router, it is characterised in that：Equipped with dc bus,
Looped network is formed by dc bus, some multiport energy source routers are set on looped network of DC power, interval multiport energy source router it
Between be provided with block switch.The dc bus is connected to the ac bus of outside by DC/AC transverters.
The looped network of DC power is low-voltage direct looped network.
Exterior all kinds of electricity generation systems, energy-storage system can access the direct current ring by each multiport energy source router
Net, meanwhile, exterior all kinds of loads can obtain the energy by multiport energy source router nearby, form small-sized local direct current and match somebody with somebody
Power grid.
The multiport energy source router, including multiport DC/DC parts, suppression dc bus wave portion, DC/AC changes
Side change part, DC side input/output section.The multiport DC/DC parts are the DC/DC low-pressure sides of router, by a plurality of only
Vertical branch composition, is connected in parallel between branch, and each branch uses the two-way DC/DC transformation topologies of non-isolation type, can directly with outside
Photovoltaic cells, wind energy unit, the energy-storage units in portion are connected.The DC/AC converts side part, and exchange side power grid and high-pressure side is straight
Busbar connection is flowed, using two level three-phase half-bridge topologies.The suppression dc bus wave portion includes capacitance C4, the electricity
Hold the positive and negative electrode that C4 is connected in parallel on dc bus.The DC side input/output section, direct current ring is connected directly to by conducting wire
Net.
As embodiment technical solution, multiport DC/DC parts are made of three separate branches (#2,3,5), are #2
Port branch, #3 ports branch, #5 ports branch, every branch configuration inductance and capacitance, wherein by taking the branch of #2 ports as an example, often
A branch structure is circuit energy storage inductor including a L1, concatenates with #2 ports access energy-storage units, for storage energy, adjusts
The voltage change ratio of whole input and output.It is circuit input side filter capacitor including a C1, with #2 ports access energy-storage units simultaneously
Connect, for filtering out high frequency electric ripple, finally obtain smooth direct current output.Including the branch being made of two groups of IGBT modules；
Connected between two groups of IGBT modules by node A, while each the other end is respectively connected to the positive and negative electrode of dc bus；
The node A is connected to the energy outlet side that the L1 is circuit energy storage inductor；Each IGBT module is reverse and connects an afterflow two
Pole pipe；IGBT (VS5) is reverse and connects fly-wheel diode (VD5), and IGBT (VS6) is reverse and meets fly-wheel diode VD6, forms two groups
IGBT module, the collector of the IGBT (VS5) are connected to the cathode of dc bus, and IGBT (VS6) emitter is connected to
The anode of dc bus.
As embodiment technical solution, power module, LC that the DC/AC conversion sidepiece point includes sequentially concatenating are filtered back
Road, isolating transformer, #4 exchange side output ports；The positive and negative electrode of dc bus is connected to by power module；The power module
Including 6 IGBT (VS7-VS12) and 6 fly-wheel diodes (VD7-VD12), 6 IGBT are the 7th IGBT (VS7),
9th IGBT (VS9), the 11st IGBT (VS11), the 8th IGBT (VS8), the tenth IGBT (VS10), the 12nd IGBT
(VS12), 6 fly-wheel diodes for the 7th fly-wheel diode (VD7), the 8th fly-wheel diode (VD8), the 9th afterflow two
Pole pipe (VD9), the tenth fly-wheel diode (VD10), the 11st fly-wheel diode (VD11), the 12nd fly-wheel diode (VD12)：
V7-V12 is DC/AC Partial Power switching tubes, and each bridge arm is made of IGBT power tubes and antiparallel diode, with bridge arm
7th fly-wheel diode (VD7) i.e. upper and lower, the 8th fly-wheel diode (VD8), two pole of the 9th afterflow between upper and lower two power
Manage (VD9), the tenth fly-wheel diode (VD10), the 11st fly-wheel diode (VD11), the 12nd fly-wheel diode (VD12) it
Between can prevent from simultaneously turning on there are dead time.7th IGBT (VS7), the 9th IGBT (VS9), the 11st IGBT
(VS11) collector is connected to the cathode of dc bus, the 8th IGBT (VS8), the tenth IGBT (VS10), the 12nd
IGBT (VS12) emitter is connected to the anode of dc bus；7th IGBT (VS7), the 9th IGBT (VS9), the 11st
The emitter of IGBT (VS11) respectively with the 8th IGBT (VS8), the tenth IGBT (VS10), the 12nd IGBT (VS12) collection
Electrode concurrent.The LC filter circuits being made of L4 and C5, make trend sine wave, to change to power module output waveform filtering process
The sine wave of depressor T1 output smoothings；The transformer T1 exchanges exported are connected to by common electrical by #4 exchange side output port
Net or load.
As embodiment technical solution, DC side input and output portion is divided into #1 ports, and direct current is connected directly to by conducting wire
Looped network.
Further expand, will construction multiport residents energy source router looped network of DC power framework by direct current transmission circuit with
Multiport residents energy source router looped network of DC power framework forms interconnection, forms multi-level straight-flow system.
Looped network of DC power architecture technology scheme above based on multiport residents energy source router, due to the use of multiport road
By device can on-site elimination distributed new to greatest extent, various energy resources complementation can improve power supply reliability, at the same by
In using low-voltage direct ring network power supply, a circuit part breaks down, can the part of isolated fault in time, avoid causing on a large scale
Power outage, transmission of electricity line loss on decrease, be a kind of powering mode of high-quality.
Power inverter and its control will correspondingly be increased by often increasing a port in conventional electric power electronics grid-connected system
Circuit, system cost are higher.For simplied system structure, cost is reduced, effective method is exactly power in reduction system
The quantity of converter.For this reason, the utility model energy source router prime DC converting side is former using the substitution of single power inverter
The multiple power inverters having, the topology combination and function for realizing power inverter merge.Power inverter after merging participates in
Energy transmission between multiple dc bus ports.One-way or bi-directional energy can be achieved between input port and output port to pass
Pass, energy transmission can be while or timesharing, and energy cannot be mutually transmitted between other ports.
The utility model direct-current grid main advantage concentrates on：
A) the high quality powering solution of customization can be provided；
B) reduce voltage transformation link, reduce equipment investment and running wastage；
C) simultaneously network interface can be provided for straight/exchange micro-capacitance sensor, improving the operational reliability of micro-capacitance sensor can simultaneously meet to exchange micro- electricity
The harmonic wave control of net, reactive-load compensation and energy is counter send demand.
Brief description of the drawings
Fig. 1 is looped network of DC power configuration diagram of the utility model based on multiport residents energy source router.
Fig. 2 is energy router body main structure schematic diagram in Fig. 1.
Fig. 3 is energy router topological structure.
Fig. 4 is by the wide area network link schematic diagram of looped network of DC power framework structure interconnection.
Embodiment
Technical solutions of the utility model are described further below in conjunction with drawings and embodiments.
Embodiment 1
As shown in Figure 1, the present embodiment constructs small-sized local DC distribution net by taking 4 multiport energy source routers as an example,
Wherein
Equipped with dc bus, looped network is formed by dc bus, set on looped network of DC power it is some (the present embodiment set more than four
Port can source router) multiport energy source router, it is spaced between multiport energy source router and is provided with block switch.It is described straight
Stream looped network is low-voltage direct looped network.The dc bus is connected to ac bus (this part category of outside by DC/AC transverters
The prior art, and be this area routine techniques).
Exterior all kinds of electricity generation systems, energy-storage system can access the direct current ring by each multiport energy source router
Net, meanwhile, exterior all kinds of loads can obtain the energy by multiport energy source router nearby, form small-sized local direct current and match somebody with somebody
Power grid, can mutually be adjusted with the energy.
Dc bus configuring direct current block switch in single lan, there is provided system-level protection.
As shown in Fig. 2, the body construction of each multiport energy source router：
Input side is converted by prime multiport DC converter (Multi-Port DC/DC Converters, MPC)
Direct current side bus is imported for certain DC voltage (such as 350Vdc), then goes out certain alternating voltage by rear class DC/AC module inversions and (leads to
Often be 220Vac) for rear end it is grid-connected or load use.
Multiport energy source router operational mode：Input port #2 can access energy-storage system；Input port #3 can access point
Cloth wind-powered electricity generation and photovoltaic generating system；Input port #5 can access fuel cell generation；The defeated entry/exit port #1 sides of direct current can
Looped network of DC power is incorporated to, while supports energy in bidirectional flow；Ac output end mouth #4 rear ends connect actual loading and bulk power grid is grid-connected
Mouthful.
As shown in figure 3, the circuit topological structure of the multiport energy source router of the present embodiment is：
First,Prime, low-pressure side, DC/DC modules(the latter half topological diagram as shown in Figure 3), wherein
Multiport DC/DC parts are the DC/DC low-pressure sides of router, are made of three separate branches (#2,3,5),
For #2 ports branch, #3 ports branch, #5 ports branch, it is connected in parallel between branch, each branch is two-way using non-isolation type
DC/DC transformation topologies, can directly be connected with photovoltaic, energy-storage units.Compared to conventional three-phase crisscross parallel topology, the utility model
Technical solution realize herein each branch can independent operating, every branch configuration inductance and capacitance, wherein by taking the branch of #2 ports as an example,
Each branch structure is designed as：
It is circuit energy storage inductor including a L1, the L1 is concatenated with #2 ports access energy-storage units, is mainly used for depositing
Energy storage capacity, adjusts the voltage change ratio of input and output.
It is circuit input side filter capacitor including a C1, the C1 accesses energy-storage units with the #2 ports and connects, mainly
For filtering out high frequency electric ripple, smooth direct current output is finally obtained；
Including the branch being made of two groups of IGBT modules；Connected between two groups of IGBT modules by node A, at the same time
The respective other end is respectively connected to the positive and negative electrode of dc bus；The node A is connected to the energy that the L1 is circuit energy storage inductor
Measure outlet side；Each IGBT module is reverse and connects a fly-wheel diode；
5th IGBT (VS5) reversely and connects the 5th fly-wheel diode (VD5), and the 6th IGBT (VS6) is reversely and to connect the 6th continuous
Diode VD6 is flowed, forms two groups of IGBT modules, the collector of the 5th IGBT (VS5) is connected to the cathode of dc bus, institute
State the anode that the 6th IGBT (VS6) emitter is connected to dc bus.
When energy-storage units are accessed in #2 ports, when energy flows to dc bus side by battery unit, inductance L1 is filled first
Electricity, while inductive current increases, VS5 is turned off with VS6 alternate conductions in circuit, and VD5 and VD6 carries out current stream, loop works
In Boost patterns, in such a mode, control and power adjustment of the duty cycle realization of VS6 to output voltage are mainly adjusted by,
VS5 is managed and VS6 carries out alternate conduction, primarily to afterflow, improves device efficiency.When decompression mode is run, charge to battery,
Realize the voltage and Power Control to battery side, the duty cycle by controlling upper tube VS5 is realized.Down tube VS6 alternately lead
Logical effect improves device efficiency also for afterflow.
Similarly, #3 ports, #5 ports are similar with #2 ports, can work independently in charging and discharge mode and mutual nothing
Interference.
When to port #2, #3, when #5 is charged, three half-bridges (are named as：Power module) upper tube VS1, VS3,
VS5 carries out alternate conduction, and the pulse of switching tube differs 120 °, and the electric current between three inductance (L1, L2, L3) forms staggeredly folded
Add, the final equivalent high frequency ripple current amplitude for flowing through high voltage bus side substantially reduces, and so can largely reduce on high-tension side
DC support capacitance, reduces the volume and cost of equipment.And relatively low high frequency ripple current can reduce system heat generation, equipment
Stability and the service life can obtain larger lifting.
2nd, dc bus fluctuation is suppressed, wherein
C4 is DC side bus capacitor, is connected in parallel on the positive and negative electrode of dc bus, predominantly suppresses dc bus fluctuation.
3rd,Rear class, DC/AC modules(top half topological diagram as shown in Figure 3), wherein
Exchange side power grid is connected by DC/AC Partial Transformations side with high-pressure side dc bus, is opened up using two level three-phase half-bridges
Structure is flutterred, which is：Including sequentially concatenate power module, LC filter circuits, isolating transformer, #4 exchange side output
Port；
The positive and negative electrode of dc bus is connected to by power module；The power module include 6 IGBT (VS7-VS12) with
And 6 fly-wheel diodes (VD7-VD12), 6 IGBT are the 7th IGBT (VS7), the 9th IGBT (VS9), the 11st
IGBT (VS11), the 8th IGBT (VS8), the tenth IGBT (VS10), the 12nd IGBT (VS12), 6 fly-wheel diodes are
7th fly-wheel diode (VD7), the 8th fly-wheel diode (VD8), the 9th fly-wheel diode (VD9), the tenth fly-wheel diode
(VD10), the 11st fly-wheel diode (VD11), the 12nd fly-wheel diode (VD12)：
V7-V12 is DC/AC Partial Power switching tubes, and each bridge arm is made of IGBT power tubes and antiparallel diode,
And under net state, electric current flows to DC/AC by high voltage dc bus side (i.e. #1 direct-flow input ends mouth) and becomes side change, in control signal
Under driving, 6 power tube alternate conduction shut-offs, cannot change direction immediately, each diode current flow continues since there are load current
Stream, with (upper and lower VD7, VD8, VD9, VD10, between VD11, VD12) between two power up and down of bridge arm, there are dead time
It can prevent from simultaneously turning on, the waveform through power module inversion output is handled using pulse modulation technology.
The LC filter circuits (this partial circuit belongs to the prior art in this area) being made of L4 and C5, it is defeated to power module
Going out waveform filtering process makes trend sine wave, that is, filters out the higher hamonic wave that power module inversion goes out, to transformer T1 output smoothings
Sine wave；
T1 is isolating transformer, and power electronics part and system are done electrical isolation；
The transformer T1 exchanges exported are connected to by public electric wire net or load by #4 exchange side output port.
Dc bus charges during normal operation, and the interleaved clearances of VS7-VS12 are broken, and VD7-12 carries out circuit afterflow, LC circuits
Higher harmonic components are filtered out, grid-connected by transformer, #4 ports are equipment grid entry point, can be directly accessed power grid or load.
4th, DC side input and output (right half topological diagram as shown in Figure 3)
#1 ports：Looped network of DC power is connected directly to by conducting wire
It is to be understood that above control section belongs to state of the art, system carries out necessary class such asTo output The control of voltage, power adjustment, constant voltage/constant current control, constant pressure/constant frequency control, shut-off control are turned on to power tube, to same bridge arm Two power tube Power MOSFETs, carry out necessary processing to output waveform using pulsewidth modulationEtc. each function, routine is utilized
Technology can be achieved, i.e., the central control unit in traditional ordinary power converter is usually all also required to the content completed.
It is to be understood that control section is not belonging to the invention task of the utility model, technical solutions of the utility model
Key technology contribution is the Topology Structure Design of open circuit, to realize that " a pair of of multi-router " and " looped network of DC power framework " is set
The invention task thought.Control section is the problem of follow-up research and development consider.
The present embodiment looped network of DC power operational mode introduction：
Multiport energy source router is inputted by direct current and output port #1 is incorporated to direct current distribution, energy capable of bidirectional flowing,
Can source router direct current output mouth side may be configured with bidirectional, dc ammeter, it is measurable can the external output power of source router, when
When transience power failure occur in energy source router #4 AC networks, it can be supported by DC port side energy, by energy source router #2
Or energy source router #3 powers, energy can interconnect between each router.The operational mode inherits the advantage of direct current distribution, at the same time
Due to taking energy source router to be directly incorporated into direct current distribution, reduce one-stage transfor-mation, have lifting in the efficiency of bulk supply.
Looped network of DC power advantage：By power load reasonable distribution, shorten radius of electricity supply, improve the voltage matter of user terminal comprehensively
Amount.When circuit a part break down, can the part of isolated fault in time, avoid causing large-scale power outage.
Embodiment 2
The present embodiment 2 is that embodiment 1 is further expanded, and the system structure formed as shown in Figure 1, embodiment 1 is constructed
Small-sized local DC distribution net formed and interconnect by direct current transmission circuit and other direct current distributions, form multi-level direct current
System.In this way, energy can flow mutually between each local straight-flow system, further enhance the stability of direct-flow distribution system and resist
Interference.
Claims (8)
- A kind of 1. looped network of DC power framework based on multiport residents energy source router, it is characterised in that：Equipped with dc bus, by Dc bus forms looped network, and some multiport energy source routers are set on looped network of DC power, is spaced between multiport energy source router Block switch is provided with, which is connected to the ac bus of outside by DC/AC transverters.
- 2. the looped network of DC power framework as claimed in claim 1 based on multiport residents energy source router, it is characterised in that：Institute It is low-voltage direct looped network to state looped network of DC power.
- 3. the looped network of DC power framework as claimed in claim 1 based on multiport residents energy source router, it is characterised in that：Outside All kinds of electricity generation systems in portion, energy-storage system access the looped network of DC power by each multiport energy source router, meanwhile, it is exterior each Class load obtains the energy by multiport energy source router nearby, forms small-sized local DC distribution net.
- 4. the looped network of DC power framework as claimed in claim 1 based on multiport residents energy source router, it is characterised in that：Institute State multiport energy source router, including multiport DC/DC parts, suppress dc bus wave portion, DC/AC conversion side part, DC side input/output section；The multiport DC/DC parts are the DC/DC low-pressure sides of router, are made of a plurality of separate branches, in parallel between branch Connection, each branch use the two-way DC/DC transformation topologies of non-isolation type, the directly photovoltaic cells, wind energy unit, energy storage with outside Unit is connected；The DC/AC converts side part, and exchange side power grid is connected with high-pressure side dc bus, is opened up using two level three-phase half-bridges Flutter structure；The suppression dc bus wave portion includes capacitance C4, and capacitance C4 is connected in parallel on the positive and negative electrode of dc bus；The DC side input/output section, looped network of DC power is connected directly to by conducting wire.
- 5. the looped network of DC power framework as claimed in claim 4 based on multiport residents energy source router, it is characterised in that：It is more Port DC/DC part be by three separate branches (#2,3,5) form, be #2 ports branch, #3 ports branch, #5 ports branch, Every branch configuration inductance and capacitance, wherein by taking the branch of #2 ports as an example, each branch structureIt is circuit energy storage inductor including a L1, the circuit energy storage inductor is concatenated with #2 ports branch access energy-storage units；It is circuit input side filter capacitor, the circuit input side filter capacitor and #2 ports access energy storage including a C1 Unit simultaneously connects；Including the branch being made of two groups of IGBT modules；Connected between two groups of IGBT modules by node A, at the same it is each another One end is respectively connected to the positive and negative electrode of dc bus；The node A is connected to the energy that the L1 is circuit energy storage inductor and exports Side；Each IGBT module is reverse and connects a fly-wheel diode；5th IGBT (VS5) is reverse and connects the 5th fly-wheel diode (VD5), 6th IGBT (VS6) is reverse and meets the 6th fly-wheel diode VD6, forms two groups of IGBT modules, the collection of the 5th IGBT (VS5) Electrode is connected to the cathode of dc bus, and the 6th IGBT (VS6) emitter is connected to the anode of dc bus.
- 6. the looped network of DC power framework as claimed in claim 4 based on multiport residents energy source router, it is characterised in that：Institute State power module, LC filter circuits, isolating transformer, #4 exchange side output terminals that DC/AC conversion sidepieces point include sequentially concatenating Mouthful；The positive and negative electrode of dc bus is connected to by power module；The power module includes 6 IGBT (VS7-VS12) and 6 A fly-wheel diode (VD7-VD12), 6 IGBT are the 7th IGBT (VS7), the 9th IGBT (VS9), the 11st IGBT (VS11), the 8th IGBT (VS8), the tenth IGBT (VS10), the 12nd IGBT (VS12), 6 fly-wheel diodes are the 7th Fly-wheel diode (VD7), the 8th fly-wheel diode (VD8), the 9th fly-wheel diode (VD9), the tenth fly-wheel diode (VD10), 11st fly-wheel diode (VD11), the 12nd fly-wheel diode (VD12)：Each bridge arm is by IGBT power tubes and antiparallel Diode forms, and can prevent from simultaneously turning on there are dead time between two power up and down of bridge arm；It is between two power up and down of the same bridge arm：Upper and lower the 7th fly-wheel diode (VD7), the 8th fly-wheel diode (VD8), the 9th fly-wheel diode (VD9), the tenth fly-wheel diode (VD10), the 11st fly-wheel diode (VD11), the 12nd Between fly-wheel diode (VD12)；7th IGBT (VS7), the 9th IGBT (VS9), the collector of the 11st IGBT (VS11) are connected to dc bus Cathode, the 8th IGBT (VS8), the tenth IGBT (VS10), the 12nd IGBT (VS12) emitter are connected to dc bus Anode；7th IGBT (VS7), the 9th IGBT (VS9), the emitter of the 11st IGBT (VS11) are respectively with the described 8th IGBT (VS8), the tenth IGBT (VS10), the collector concurrent of the 12nd IGBT (VS12)；The LC filter circuits being made of L4 and C5, make trend sine wave, to transformer to power module output waveform filtering process The sine wave of T1 output smoothings；The transformer T1 exchanges exported are connected to by public electric wire net or load by #4 exchange side output port.
- 7. the looped network of DC power framework as claimed in claim 4 based on multiport residents energy source router, it is characterised in that：Directly Stream side input and output portion is divided into #1 ports, and looped network of DC power is connected directly to by conducting wire.
- 8. the looped network of DC power framework based on multiport residents energy source router as described in claim 1 to 7 is any, its feature It is：Construction multiport residents energy source router looped network of DC power framework is passed through into direct current transmission circuit and multiport residents energy Source router looped network of DC power framework forms interconnection, forms multi-level straight-flow system.
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