CN105515401A - Solid state transformer in modularized multi-level structure - Google Patents
Solid state transformer in modularized multi-level structure Download PDFInfo
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- CN105515401A CN105515401A CN201510866616.1A CN201510866616A CN105515401A CN 105515401 A CN105515401 A CN 105515401A CN 201510866616 A CN201510866616 A CN 201510866616A CN 105515401 A CN105515401 A CN 105515401A
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Abstract
The invention relates to a solid state transformer in a modularized multi-level structure, and the transformer consists of an input stage, an isolation stage, and an output stage. The input stage is a three-phase MMC (modularized multi-level converter), and is formed through the cascading connection of submodules. An AC side is connected with a 110KV power distribution network, and is connected with the isolation stage through a high-voltage DC bus. The isolation stage is formed by the cascading connection of a plurality of subunits, and each subunit sequentially comprises a single-phase MMC inverter, a high-frequency transformer, a single-phase MMC rectifier, wherein the single-phase MMC inverter and the rectifier are respectively formed by the cascading connection of submodules. The isolation stage is connected with the input stage and the output stage through a high-voltage DC bus and a low-voltage DC bus. The output stage is a three-phase modularized multi-level current transformer, and is also formed by the cascading connection of submodules. An AC side is connected with a 10KV power distribution network. The transformer provided by the invention can reduce the size and weight, employs a modularized design, is good in flexibility, is good in control performance, can achieve the bidirectional flow of power, and carries out the compensation of the electric energy quality of the power grid.
Description
Technical field
The present invention relates to a kind of electric power electric transformer, be specifically related to a kind of solid-state transformer of modular multilevel structure.
Background technology
Along with the development of economic society, installed capacity and the annual energy output of electric power system constantly improve, and electrical network scale constantly expands, and the safe and stable operation problem of electric power system becomes distinct issues.And in increasing nonlinear-load access electrical network, had a strong impact on the quality of power supply of electrical network, meanwhile, the many sensitiveness loads in electrical network are more and more higher for the requirement of the quality of power supply, and power quality problem becomes increasingly conspicuous.Traditional power transformer is as the most basic power transmission and transformation device, function is comparatively single, there are again volume, weight large simultaneously, output voltage fluctuates with the fluctuation of load, transformer wet goods insulating material has potential pollution to environment, produce harmonic wave during core sataration, the deficiencies such as poor controllability, have more and more been difficult to the requirement meeting modern power systems.
Solid-state transformer, is also called electric power electric transformer, is a kind of a kind of novel intelligent transformer grown up on the basis of high-power electric and electronic converter technique.Except the function of traditional power transformer transformation, isolation and power conversion, it also has the function of harmonics restraint, reactive power compensation, distributed energy access and power flowcontrol.The blank of solid-state transformer is taken the lead in proposing in 1970 by GE company of the U.S., so far, has occurred a variety of topological structure, initial primary structure, secondary structure and and the tertiary structure that adopts of current most solid-state transformer.Although the solid-state transformer of tertiary structure adds complexity in circuits and number of devices, it can realize such as reactive power compensation, the more function such as power flowcontrol and distributed power generation access.What the present invention adopted is exactly the solid-state transformer of tertiary structure.
Summary of the invention
Object of the present invention is exactly the weak point in order to overcome traditional transformer, a kind of volume is proposed little, lightweight, be applicable to the solid-state transformer of 110KV/10KV conversion, except the transformation of traditional power transformer, isolation and power conversion function, also there is utility power quality control function, when spread of voltage appears in electrical network, asymmetrical three-phase, during the situations such as harmonic content is large, still can the high quality of power supply of guaranteed load side.Object of the present invention can be achieved through the following technical solutions:
A solid-state transformer for modular multilevel structure, is characterized in that, based on modular multilevel structure, comprising:
One input stage: be a three-phase modular multilevel current transformer, each of described three-phase modular multilevel current transformer is divided into first brachium pontis and second brachium pontis mutually, first brachium pontis and second brachium pontis form by n submodule and the cascade of a brachium pontis inductance, and the intermediate point of each phase brachium pontis is connected with 110KV power distribution network by an inductance;
One isolation level: isolation level unit cascadedly to be formed by k son, and each subelement comprises a single-phase MMC inverter, a high frequency transformer and a single-phase MMC rectifier successively, and isolation level is connected with input stage, output stage respectively by high and low pressure DC bus; Described single-phase MMC inverter and single-phase MMC rectifier all have two brachium pontis; each brachium pontis forms by sub module cascade; the inductance that series connection two is equal in the middle of brachium pontis; the mid point of single-phase MMC inverter two brachium pontis goes between connected with two of the former limit of corresponding high frequency transformer, and single-phase MMC rectifier two brachium pontis mid point goes between with high frequency transformer secondary two and is connected;
One output stage: be a three-phase modular multilevel current transformer, each of described three-phase modular multilevel current transformer is divided into first brachium pontis and second brachium pontis mutually, first brachium pontis and second brachium pontis form by m submodule and the cascade of a brachium pontis inductance, and the intermediate point of each phase brachium pontis is connected with 10KV power distribution network by an inductance;
At the solid-state transformer of above-mentioned a kind of modular multilevel structure, described submodule, with Capacitance parallel connection forms after being connected by two wholly-controled device with anti-paralleled diode again; Wholly-controled device can be IGBT or MOSFET or IGCT, and device material can be Si or SiC or GaN material.In the part that the present invention is different, the device in submodule can select different kinds, such as selects high frequency switching device at the full-controlled switch device of the band anti-paralleled diode of isolation level Neutron module; And lower at the voltage of output stage, but electric current is comparatively large, and the full-controlled switch device of its band anti-paralleled diode can select the switching device that can bear larger current.
At the solid-state transformer of above-mentioned a kind of modular multilevel structure, as shown in Figure 2, in described input stage, the wholly-controled device in submodule can be IGBT or MOSFET or IGCT; Device adopts Si or SiC or GaN material; Come access or the bypass of control capacitance by the switching device controlled in submodule, when normally working, each phase of each moment has n capacitances in series place in circuit, and this n capacitance voltage be high voltage dc bus voltage.
At the solid-state transformer of above-mentioned a kind of modular multilevel structure, the switching device in described isolation level is the full-controlled switch device with anti-paralleled diode, and is high frequency switching device; Described subelement, comprise single-phase MMC inverter, high frequency transformer, single-phase MMC rectifier, three connects successively, and k son is unit cascaded on DC bus; Each single-phase MMC inverter contains two brachium pontis, and each brachium pontis is formed by 2x sub module cascade, the inductance that series connection two is equal in the middle of brachium pontis, and the mid point of single-phase MMC inverter two brachium pontis goes between connected with two of the former limit of corresponding high frequency transformer; Each single-phase MMC rectifier is equally containing two brachium pontis, and each brachium pontis has 2y sub module cascade to form, two equal inductance of connecting equally in the centre of brachium pontis, and the mid point of single-phase MMC rectifier two brachium pontis is connected with going between with high frequency transformer secondary two; The no-load voltage ratio of each high frequency transformer is identical, connects corresponding single-phase MMC inverter and single-phase MMC rectifier.
At the solid-state transformer of above-mentioned a kind of modular multilevel structure, described output stage is three-phase modular multilevel current transformer, it is connected with isolation level by low-voltage direct bus, each of this three-phase modular multilevel current transformer is divided into first brachium pontis and second brachium pontis mutually, first brachium pontis and second brachium pontis form by m submodule and the cascade of a brachium pontis inductance, and the intermediate point of each phase brachium pontis is connected with 10KV power distribution network by an inductance; Switching device in output stage is the full-controlled switch device with anti-paralleled diode, requires that these devices can bear larger electric current.
The present invention has the following advantages: the design 1, adopting modular multilevel structure, can be connected directly between among electrical network, and its modular design makes the design of this solid-state transformer, assembling, maintenance, dilatation etc. very must facilitate, flexible.2, the mode of the multiple subelement cascade of the employing of isolation level carries out dividing potential drop, reduces the on high-tension side voltage of high frequency transformer.3, adopt high frequency transformer, reduce the volume and weight of transformer.4, control flexibly, by control module Multilevel Inverters, the stable of high and low pressure DC bus-bar voltage can be ensured, realize the two-way flow of power, and the electrical network quality of power supply is compensated.
Accompanying drawing explanation
Fig. 1 is a kind of topological structure schematic diagram of the present invention.
Fig. 2 is the topological structure schematic diagram of input stage in the present invention.
Fig. 3 is the single-phase MMC inverter topological structure schematic diagram in the present invention in isolation level.
Fig. 4 is the single-phase MMC rectifier topological structure schematic diagram in the present invention in isolation level.
Fig. 5 is the topological structure schematic diagram of isolation level neutron cells in the present invention.
Fig. 6 is the topological structure schematic diagram of output stage in the present invention.
Fig. 7 is a kind of topological structure schematic diagram of Neutron module of the present invention.
Specific implementation method
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
As shown in Figure 1, the present invention adopts the three-stage type mapped structure of AC-DC-AC, is made up of input stage 1, isolation level 2 and output stage 3;
One input stage: be a three-phase modular multilevel current transformer, as shown in Figure 2, each of described three-phase modular multilevel current transformer is divided into first brachium pontis and second brachium pontis mutually, and first brachium pontis and second brachium pontis are by n submodule and a brachium pontis inductance
l 1 cascade forms, and the intermediate point of each phase brachium pontis is by an inductance
l 2 be connected with 110KV power distribution network; Wholly-controled device in its submodule can be IGBT or MOSFET or IGCT; Device adopts Si or SiC or GaN material; Come access or the bypass of control capacitance by the switching device controlled in submodule, when normally working, each phase of each moment has n capacitances in series place in circuit, and this n capacitance voltage be high voltage dc bus voltage.
One isolation level: as shown in fig. 1, isolation level of the present invention unit cascadedly to be formed by k son, each subelement such as Fig. 5 comprises a single-phase MMC inverter (Fig. 3), a high frequency transformer and a single-phase MMC rectifier (Fig. 4) successively, and isolation level is connected with input stage, output stage respectively by high and low pressure DC bus; In subelement, each single-phase MMC inverter contains two brachium pontis, and each brachium pontis is formed by 2x sub module cascade, the inductance that series connection two is equal in the middle of brachium pontis
l 3 , the mid point of single-phase MMC inverter two brachium pontis goes between connected with two of the former limit of corresponding high frequency transformer; In subelement, each single-phase MMC rectifier is equally containing two brachium pontis, and each brachium pontis has 2y sub module cascade to form, two equal inductance of connecting equally in the centre of brachium pontis
l 4 , the mid point of single-phase MMC rectifier two brachium pontis is connected with going between with high frequency transformer secondary two; The no-load voltage ratio of each high frequency transformer is identical, connects corresponding single-phase MMC inverter and single-phase MMC rectifier.Switching device in described isolation level is the full-controlled switch device with anti-paralleled diode, and is high frequency switching device.
One output stage; Be illustrated in figure 6 three-phase modular multilevel current transformer, it is connected with isolation level by low-voltage direct bus, each of this three-phase modular multilevel current transformer is divided into first brachium pontis and second brachium pontis mutually, and first brachium pontis and second brachium pontis are by m submodule and a brachium pontis inductance
l 5 cascade forms, and the intermediate point of each phase brachium pontis is by an inductance
l 6 be connected with 10KV power distribution network; Switching device in output stage is the full-controlled switch device with anti-paralleled diode, requires that these switching devices can bear larger electric current.
Submodule, as shown in Figure 7, with Capacitance parallel connection forms after being connected by two wholly-controled device with anti-paralleled diode again; Wholly-controled device can be IGBT or MOSFET or IGCT, and device material can be Si or SiC or GaN material.In the part that the present invention is different, the device in submodule can select different kinds, such as selects high frequency switching device at the full-controlled switch device of the band anti-paralleled diode of isolation level Neutron module; And lower at the voltage of output stage, but electric current is comparatively large, and the full-controlled switch device of its band anti-paralleled diode can select the switching device that can bear larger current.
The present invention adopts modular construction, has plurality of advantages, by the flexible control to individual part, there is power quality compensation function, when spread of voltage appears in electrical network, asymmetrical three-phase, during the situations such as harmonic content is large, still can the higher quality of power supply of guaranteed load side.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Claims (5)
1. a solid-state transformer for modular multilevel structure, is characterized in that, based on modular multilevel structure, comprising:
One input stage: be a three-phase modular multilevel current transformer, each of described three-phase modular multilevel current transformer is divided into first brachium pontis and second brachium pontis mutually, first brachium pontis and second brachium pontis form by n submodule and the cascade of a brachium pontis inductance, and the intermediate point of each phase brachium pontis is connected with 110KV power distribution network by an inductance;
One isolation level: isolation level unit cascadedly to be formed by k son, and each subelement comprises a single-phase MMC inverter, a high frequency transformer and a single-phase MMC rectifier successively, and isolation level is connected with input stage, output stage respectively by high and low pressure DC bus; Described single-phase MMC inverter and single-phase MMC rectifier all have two brachium pontis; each brachium pontis forms by sub module cascade; the inductance that series connection two is equal in the middle of brachium pontis; the mid point of single-phase MMC inverter two brachium pontis goes between connected with two of the former limit of corresponding high frequency transformer, and single-phase MMC rectifier two brachium pontis mid point goes between with high frequency transformer secondary two and is connected;
One output stage: be a three-phase modular multilevel current transformer, each of described three-phase modular multilevel current transformer is divided into first brachium pontis and second brachium pontis mutually, first brachium pontis and second brachium pontis form by m submodule and the cascade of a brachium pontis inductance, and the intermediate point of each phase brachium pontis is connected with 10KV power distribution network by an inductance.
2. the solid-state transformer of a kind of modular multilevel structure according to claim 1, is characterized in that, described submodule, with Capacitance parallel connection forms after being connected by two wholly-controled device with anti-paralleled diode again; Wholly-controled device is IGBT or MOSFET or IGCT, and device material is Si or SiC or GaN material.
3. the solid-state transformer of a kind of modular multilevel structure according to claim 1, is characterized in that, in described input stage, the wholly-controled device in submodule can be IGBT or MOSFET or IGCT; Device adopts Si or SiC or GaN material; Come access or the bypass of control capacitance by the switching device controlled in submodule, when normally working, each phase of each moment has n capacitances in series place in circuit, and this n capacitance voltage be high voltage dc bus voltage.
4. the solid-state transformer of a kind of modular multilevel structure according to claim 1, is characterized in that, the switching device in described isolation level is the full-controlled switch device with anti-paralleled diode, and is high frequency switching device; Described subelement, comprise single-phase MMC inverter, high frequency transformer, single-phase MMC rectifier, three connects successively, and k son is unit cascaded on DC bus; Each single-phase MMC inverter contains two brachium pontis, and each brachium pontis is formed by 2x sub module cascade, the inductance that series connection two is equal in the middle of brachium pontis, and the mid point of single-phase MMC inverter two brachium pontis goes between connected with two of the former limit of corresponding high frequency transformer; Each single-phase MMC rectifier is equally containing two brachium pontis, and each brachium pontis has 2y sub module cascade to form, two equal inductance of connecting equally in the centre of brachium pontis, and the mid point of single-phase MMC rectifier two brachium pontis goes between with high frequency transformer secondary two and is connected; The no-load voltage ratio of each high frequency transformer is identical, connects corresponding single-phase MMC inverter and single-phase MMC rectifier.
5. the solid-state transformer of a kind of modular multilevel structure according to claim 1, it is characterized in that, described output stage is three-phase modular multilevel current transformer, it is connected with isolation level by low-voltage direct bus, each of this three-phase modular multilevel current transformer is divided into first brachium pontis and second brachium pontis mutually, first brachium pontis and second brachium pontis form by m submodule and the cascade of a brachium pontis inductance, and the intermediate point of each phase brachium pontis is connected with 10KV power distribution network by an inductance; Switching device in output stage is the full-controlled switch device with anti-paralleled diode.
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| CN106998145A (en) * | 2017-04-10 | 2017-08-01 | 东南大学 | Reversely DC converting unit is cascaded with circulation from the symmetric double of the ability of elimination |
| CN107947222A (en) * | 2017-12-26 | 2018-04-20 | 北京金风科创风电设备有限公司 | Direct current fan power transmission system |
| CN108270356A (en) * | 2018-01-29 | 2018-07-10 | 浙江大学 | DC distribution network energy router and its control method based on PWM/ diode mixed-rectification structures |
| CN108539987A (en) * | 2018-05-15 | 2018-09-14 | 南京理工大学 | A kind of modular multilevel DC solid transformer and its charge control method |
| CN113098044A (en) * | 2021-03-26 | 2021-07-09 | 广东电网有限责任公司 | Current converter-based power distribution system and power distribution method |
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