CN106253728B - Multi-port modular multi-level converter for Multi-end flexible direct current transmission application - Google Patents
Multi-port modular multi-level converter for Multi-end flexible direct current transmission application Download PDFInfo
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- CN106253728B CN106253728B CN201610670336.8A CN201610670336A CN106253728B CN 106253728 B CN106253728 B CN 106253728B CN 201610670336 A CN201610670336 A CN 201610670336A CN 106253728 B CN106253728 B CN 106253728B
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- 230000005611 electricity Effects 0.000 claims abstract description 5
- 238000013459 approach Methods 0.000 claims description 3
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
- H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
- H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/49—Combination of the output voltage waveforms of a plurality of converters
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Abstract
The present invention provides a kind of multi-port modular multi-level converters for Multi-end flexible direct current transmission application, it is made of (2n+1) a cascade converter, each cascade converter is made of three bridge arms, and each bridge arm is connected in series by N number of submodule and corresponding bridge arm impedance；(2n+1) a cascade converter forms (2n+1) a neutral point altogether in the multi-port structure MMC, DC power transmission line positive electrode bus is drawn from the neutral point of cascade converter 0,2n negative DC transmission line of electricity is drawn respectively from the neutral point of remaining 2n cascade converter, can produce 2n DC power transmission line.Bridge arm of the invention can be multiplexed, to realize the reduction of reduction, the loss and capacitor total amount of overall power number of devices, and the normal operation on the blocking of Arbitrary Fault route without influencing other transmission lines of electricity can be realized by the DC Line Fault blocking ability of converter itself in the case where not using high voltage DC breaker.
Description
Technical field
The present invention relates to flexible DC transmissions, power electronics field in electric system, and in particular, to one kind is used for
The multi-port modular multi-level converter of Multi-end flexible direct current transmission application.
Background technique
Modular multilevel converter (modular multilevel converter, MMC) is widely used in flexible straight
Flow field of power transmission, be it is a kind of suitable for high-power application converters, scalability is strong, it is with higher can
By property, the voltage stress of power switch is small in submodule, has more level number, and output power quality is higher.
MMC can be good at applying in point-to-point MMC-HVDC occasion, but expand to Multi-end flexible direct current transmission
When occasion, since high voltage DC breaker is expensive, technology is immature, needs to consider to have direct current event by converter itself
Barrier cutting capacity could constitute Multi-end flexible direct current transmission net.Multi-end flexible direct current transmission net is due to a plurality of route, when it
In after direct-current short circuit failure occurs for route, while blocking to the route DC Line Fault, other lines cannot be influenced
The normal operation on road.Therefore, MMC converter needs multiple ports, if using tradition MMC in such a way that exchange side is in parallel shape
At multiport, need power device quantity very big, submodule capacitor quantity is very big, increases the volume, cost and damage of converter
Consumption.In conclusion when forming multiport in multi-terminal HVDC transmission in application, power device in exchange side parallel connection using tradition MMC
Total capacity, loss and capacitor total amount are significantly increased, so that volume and cost are all higher.
Through retrieving, " large capacity overhead line flexible DC transmission key technology and prospect forecast ", Proceedings of the CSEE,
Volume 34, the 29th phase, 2014.It utilizes the combined converter of the series-parallel technological maheup of convertor unit, needs quantity very much
Power device and submodule capacitor, so that converter volume and cost are all higher.
Summary of the invention
For the defects in the prior art, the object of the present invention is to provide it is a kind of for Multi-end flexible direct current transmission application
Multi-port modular multi-level converter is not using high voltage DC breaker suitable for the application of Multi-end flexible direct current transmission
In the case where facilitate composition multi-terminal HVDC transmission net.
Purpose according to the present invention, the invention adopts the following technical scheme:
A kind of multi-port modular multi-level converter for Multi-end flexible direct current transmission application, by (2n+1) a cascade
Converter composition, each cascade converter are made of three bridge arms, and three bridge arms are in star-like connection by a common point, each
Bridge arm is connected in series by N number of submodule and corresponding bridge arm impedance；
The multi-port modular multi-level converter exchange flanks power grid, and (2n+1) a cascade converter forms (2n+ altogether
1) a neutral point draws DC power transmission line positive electrode bus from the neutral point of one of cascade converter, from remaining 2n grade
The neutral point of connection converter draws 2n negative DC transmission line of electricity respectively, can generate 2n DC power transmission line.
Preferably, the multi-port modular multi-level converter controls alterating and direct current by directly controlling bridge arm current
Flow and maintain the balance of bridge arm energy.It is specific:
The energy balance of three bridge arms passes through the DC component in control bridge arm current inside each cascade converter
It realizes, bridge arm energy balance between different cascade converters is realized by the Fundamental-frequency Current in control bridge arm current；Every
Three bridge arm current flip-flops inside a cascade converter are equal, 2 π/3 of mutual deviation of alternating component amplitude equal phase.
Bridge arm current all inside multiport MMC is directly controlled, to carry out effective control to ac and dc current.
Preferably, the voltage modulated method of each bridge arm includes that nearest level approaches modulation, phase-shifting carrier wave PWM modulation
Or other are suitable for the modulator approach of routine MMC, while various submodule capacitor voltages balance plan inside the bridge arm in tradition MMC
Slightly it is also fully applicable for the multi-port structure MMC.
Preferably, inside the efficiency multi-port structure MMC in order to improve converter all cascade converters bridge arm by
Several half-bridge structure submodules are in series.
Preferably, each bridge arm is connected in series by N number of submodule and corresponding bridge arm impedance, and submodule can use a variety of
Submodule topology, the submodule all from the point of view of minimum from loss all use half-bridge structure submodule, from direct current event
Should be using the submodule with DC Line Fault blocking ability, such as full-bridge submodule from the point of view of barrier cutting capacity, clamp is double
Submodule etc..
Further, in order to realize that direct fault current blocks, cascade converter 1 arrives 2n's inside multi-port structure MMC
Bridge arm uses the submodule with DC Line Fault blocking ability in series, and the bridge arm of cascade converter 0 can be using half-bridge
Module topology structure can also be in series using the submodule with failure blocking ability.
Further, the multi-port modular multi-level converter is made of (2n+1) a cascade converter, forms 2n
A port, port number can be carried out arbitrary extension.
Compared with prior art, the present invention have it is following the utility model has the advantages that
The above-mentioned multi-port modular multi-level converter of the present invention, can be realized in the feelings for not using high voltage DC breaker
Condition blocks any DC Line Fault route, the operation without influencing normal other regular links.When transmitting Same Efficieney, compare
Multiterminal transmission line of electricity is formed in exchange side parallel connection based on traditional MMC to compare, and reduces overall losses and overall power number of devices
And the total amount of submodule capacitor, improve the power density of converter.Submodule is voltage-controlled in the modulation of traditional MMC and bridge arm
System is also applied for mentioned multiport MMC.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is the circuit diagram of one embodiment of the invention multi-port modular multi-level converter；
Fig. 2 is that the embodiment of the present invention uses submodule topological structure example schematic；
Fig. 3 is the simulated effect figure of the ac output current of one embodiment of the invention；
Fig. 4 is the simulated effect figure of the submodule capacitor voltage of one embodiment of the invention.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection scope.
As shown in Figure 1, a kind of multi-port modular multi-level converter for Multi-end flexible direct current transmission application, described
Multi-port modular multi-level converter is made of (2n+1) a cascade converter, and each cascade converter is by three bridge arm groups
At, three bridge arms are in star-like connection by a common point, each bridge arm by N number of submodule and corresponding bridge arm impedance series connection and
At.
In one embodiment, the design parameter of multi-port modular multi-level converter is as follows:
Direct current transmission route is that 2 i.e. (2n=2), rated power 20MW has 6 submodules, every height in each bridge arm
Module capacitance voltage rating is 2000V, and bridge arm inductance 6mH, submodule capacitor is 9mF；DC voltage is 12000V；Exchange side
Line voltage virtual value is 6000V, frequency 50Hz；Converter is run according to unity power factor.
In the present embodiment, 3 cascade converters are denoted as respectively according to order: cascade converter 0, cascade converter 1, cascade
Converter 2, each cascade converter are made of three bridge arms, and three in cascade converter 0 bridge arm is by n half-bridge submodule
It is connected in series with corresponding bridge arm impedance, six in cascade converter 1 and 2 bridge arm is by n full-bridge submodule and accordingly
Bridge arm impedance is connected in series；3 cascade converters form 3 neutral points altogether in the multi-port structure MMC, from cascade converter
0 neutral point draws DC power transmission line positive electrode bus, draws 2 cathode respectively from the neutral point of remaining 2 cascade converter
DC power transmission line, raw 2 DC power transmission lines of common property.
The multi-port structure MMC exchange flanks power grid, and three cascade converter exchange sides are connected in parallel.If stable state is transported
The series connection submodule of bridge arm is equivalent to controllable voltage source inside multiport MMC when row, by adjusting the exchange in controllable voltage source
Component controls the AC compounent in bridge arm current, is controlled in bridge arm current by adjusting the DC component in controllable voltage source
DC component.
According to each bridge arm modulation voltage of following various controlled stage connection converter 0:
u0u1=u0udc-u0uac cos(ωt+φ)
In formula: u0u1、u0u2、u0u3It is divided into the modulation voltage of three bridge arms in cascade converter 0, u0udcFor three bridge arm tune
DC voltage in voltage processed is generated by bridge arm DC current controller, and the DC voltage in three bridge arm modulation voltages is equal,
u0uacIt for the alternating voltage peak in three bridge arm modulation voltages, is generated by bridge arm AC current control device, three bridge arm modulation
Alternating voltage phase in voltage successively 2 π/3 of mutual deviation.
According to each bridge arm modulation voltage of following various controlled stage connection converter 1:
u1u1=u1udc+u1uac cos(ωt+θ)
In formula: u1u1、u1u2、u1u3It is divided into the modulation voltage of three bridge arms in cascade converter 1, u1udcFor three bridge arm tune
DC voltage in voltage processed is generated by bridge arm DC current controller, and the DC voltage in three bridge arm modulation voltages is equal,
u1uacIt for the alternating voltage peak in three bridge arm modulation voltages, is generated by bridge arm AC current control device, three bridge arm modulation
Alternating voltage phase in voltage successively 2 π/3 of mutual deviation.
According to each bridge arm modulation voltage of following various controlled stage connection converter 2:
In formula: u2u1、u2u2、u2u3It is divided into the modulation voltage of three bridge arms in cascade converter 2, u2udcFor three bridge arm tune
DC voltage in voltage processed is generated by bridge arm DC current controller, and the DC voltage in three bridge arm modulation voltages is equal,
u2uacIt for the alternating voltage peak in three bridge arm modulation voltages, is generated by bridge arm AC current control device, three bridge arm modulation
Alternating voltage phase in voltage successively 2 π/3 of mutual deviation.
In the present embodiment, determine that the size of ac and dc current in bridge arm current realizes institute by control bridge arm energy
There is the balance of submodule capacitor voltage, it is ensured that the stable operation of multiport MMC.
It is emulated in MATLAB emulation platform, three-phase alternating current output current under rated condition is as shown in figure 3, bridge arm is sub
Module capacitance balance of voltage situation is as shown in figure 4, all submodule capacitor voltages can realize equilibrium.
In other embodiments, each bridge arm is connected in series by N number of submodule and corresponding bridge arm impedance, and submodule can be with
Using a variety of submodule topologys, the submodule all from the point of view of minimum from loss all uses half-bridge structure submodule, from tool
Having should be using the submodule with DC Line Fault blocking ability, such as full-bridge submodule from the point of view of DC Line Fault blocking ability
Block, clamp Shuangzi module etc., as shown in Fig. 2, further, in order to realize that direct fault current blocks, multi-port structure MMC
The bridge arm of internal cascade converter 1 to 2n use the submodule with DC Line Fault blocking ability in series, cascade converter 0
Bridge arm can using half-bridge submodule topological structure and also using with failure blocking ability submodule it is in series.
It compares tradition MMC and forms multi-port structure in exchange side parallel connection, when transmitting identical power, described in the present embodiment
Power device quantity required for multi-port structure MMC reduces, and required submodule capacitor total amount reduces, to realize whole
The reduction of body power device capacity and the reduction of capacitor total amount.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring substantive content of the invention.
Claims (8)
1. a kind of multi-port modular multi-level converter for Multi-end flexible direct current transmission application, it is characterised in that:
The multi-port modular multi-level converter is made of (2n+1) a cascade converter, and each cascade converter is by three
Bridge arm composition, three bridge arms are in star-like connection by a common point, and each bridge arm is by N number of submodule and corresponding bridge arm impedance
It is connected in series；
The multi-port modular multi-level converter exchange flanks power grid, and it is a that (2n+1) a cascade converter forms (2n+1) altogether
Neutral point draws DC power transmission line positive electrode bus from the neutral point of one of cascade converter, becomes from remaining 2n cascade
The neutral point of parallel operation draws 2n negative DC transmission line of electricity respectively, can generate 2n DC power transmission line.
2. a kind of multi-port modular multilevel for Multi-end flexible direct current transmission application according to claim 1
Device, which is characterized in that the multi-port modular multi-level converter is by directly controlling the bridge arm in each cascade converter
Electric current controls ac and dc current, and maintains the balance of submodule capacitor voltage inside multi-port modular multi-level converter,
And then maintain the stabilization of DC voltage.
3. a kind of multi-port modular multilevel for Multi-end flexible direct current transmission application according to claim 2
Device, which is characterized in that the electric current of each bridge arm of (2n+1) a cascade converter can directly control, and very easily distribute each
The power of port.
4. a kind of multi-port modular multilevel for Multi-end flexible direct current transmission application according to claim 1
Device, which is characterized in that each bridge arm, voltage modulated approach modulation or phase-shifting carrier wave PWM modulation using nearest level.
5. a kind of multi-port modular multilevel for Multi-end flexible direct current transmission application according to claim 1
Device, which is characterized in that each bridge arm, alternating voltage and DC voltage therein are except needing to meet voltage synthesis demand, also
Need to meet energy balance condition, to maintain the energy balance in branch's bridge arm.
6. a kind of multi-port modular for Multi-end flexible direct current transmission application according to claim 1-5 is more
Level converter, which is characterized in that each bridge arm, it is in series by several half-bridge structure submodules.
7. a kind of multi-port modular multilevel for Multi-end flexible direct current transmission application according to claim 6
Device, which is characterized in that the submodule uses the submodule of the topology with DC Line Fault blocking ability.
8. a kind of multi-port modular for Multi-end flexible direct current transmission application according to claim 1-5 is more
Level converter, which is characterized in that the multi-port modular multi-level converter is made of (2n+1) a cascade converter, shape
At 2n port, port number can be carried out arbitrary extension.
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| CN113346780B (en) * | 2021-05-28 | 2023-09-26 | 西安交通大学 | Multi-frequency three-port modularized multi-level converter |
| CN113364311B (en) * | 2021-06-25 | 2023-07-25 | 上海交通大学 | Multi-medium-voltage alternating-current port solid-state transformer and control method thereof |
| CN113422518B (en) * | 2021-06-30 | 2022-08-16 | 天津大学 | Three-phase direct AC-AC converter topology based on MMC and control method thereof |
| CN113922671B (en) * | 2021-10-21 | 2023-07-21 | 国网经济技术研究院有限公司 | Three-port flexible direct-current transmission DC-DC converter and control method thereof |
| CN114826000A (en) * | 2022-05-09 | 2022-07-29 | 北京易菲盛景科技有限责任公司 | Three-bridge-arm multilevel converter |
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