CN106655794B - A kind of electric power electric transformer and its control method - Google Patents
A kind of electric power electric transformer and its control method Download PDFInfo
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- CN106655794B CN106655794B CN201611124272.8A CN201611124272A CN106655794B CN 106655794 B CN106655794 B CN 106655794B CN 201611124272 A CN201611124272 A CN 201611124272A CN 106655794 B CN106655794 B CN 106655794B
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000002955 isolation Methods 0.000 claims description 13
- 230000001186 cumulative effect Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Rectifiers (AREA)
Abstract
The present invention relates to a kind of electric power electric transformer and its control methods, by the submodule that multiple parallel connections are arranged in the level-one at least within of three-level type electric power electric transformer, the quantity of submodule investment or excision is determined according to the output power of direct current system, this method control principle is simple, loss is being effectively reduced at light load, the working efficiency of lifting system improves the service life of transformer.Priority level of this method also according to setting, the Cumulative Elapsed Time of each power modules of real-time statistics system, submodule is put into or cuts off one by one according to the length of accumulated running time according to the demand of output power, voltage stability when each power module average operating time, lifting system investment or excision submodule is effectively reduced.
Description
Technical field
The invention belongs to power electronics fields, and in particular to a kind of electric power electric transformer and its control method.
Background technique
Electric power electric transformer is also known as solid-state transformer, intelligent universal transformer or flexible transformer, it is with electric power
Novel transformer based on electronics Semiconductor Converting Technology and electromagnetic induction technology revolutionizes the system structure of traditional transformer,
It, can be on the basis of realizing the basic functions such as conventional electric power transformer voltage grade transformation, electrical isolation and energy transmission
It realizes many additional functionalities such as bi-directional current control, utility power quality control, is the critical equipment of next-generation smart grid construction.
Current electric power electric transformer generally comprises hiigh pressure stage, isolation level and low-pressure stage three there are many topological structure
Part, wherein hiigh pressure stage generally uses the structure of cascade connection multi-level, and isolation level generally uses the knot of multiple DC/DC wired in parallel
Structure.However, power module is in operating mode to these electric power electric transformers under different loads at present, in practical application
In, the fluctuation of load in distribution is larger, so that the loss that electric power electric transformer generates at light load is big, low efficiency, restricts electric power
The functionization of electronic transformer.
Summary of the invention
The object of the present invention is to provide a kind of electric power electric transformer and its control methods, for solving power electronics transformation
The problem of loss that device generates at light load is big, low efficiency.
In order to solve the above technical problems, the present invention proposes a kind of electric power electric transformer, including five transformer schemes:
Transformer scheme one, the electric power electric transformer are three-level type, including rectification stage, isolation level and inverse cascade, until
Few wherein level-one includes more than two submodules in parallel.
Transformer scheme two, on the basis of transformer scheme one, the rectification stage includes more than two rectification units,
Each rectification unit includes more than two AC/DC submodules in parallel；The isolation level includes the two or more of output end parallel connection
Isolated location, each isolated location includes more than two DC/DC submodules in parallel；The inverse cascade includes an inversion
Unit, including more than two DC/AC submodules in parallel；Exchange side cascade between rectification unit, each rectification unit are straight
Stream side is separately connected corresponding isolated location, connects the inversion unit after the output end of each isolated location is in parallel.
Transformer scheme three, on the basis of transformer scheme two, the AC/DC submodule is opened up using H bridge or MMC circuit
It flutters.
Transformer scheme four, on the basis of transformer scheme two, the DC/DC submodule is opened up using CLLC converter
Flutter, CLLLC converter topology or phase whole-bridging circuit topology.
Transformer scheme five, on the basis of transformer scheme two, the DC/AC submodule uses two level or three level
Circuit topology.
In order to solve the above technical problems, the present invention also proposes a kind of electric power electric transformer control method, including five sides
Method scheme:
Method scheme one, the electric power electric transformer are three-level type, including rectification stage, isolation level and inverse cascade, at least
Wherein level-one includes more than two submodules in parallel；The number of the submodule investment or excision is determined according to system output power
Amount.
Method scheme two, on the basis of method scheme one, the switching mode of the submodule includes putting into or cutting one by one
It removes.
Method scheme three, on the basis of method scheme two, in the three-level type two-stage or three-level include at least
The electric power electric transformer of two submodules in parallel, the quantity of investment and excision submodule at different levels described in synchronously control.
Method scheme four is thrown on the basis of method scheme one, method scheme two or method scheme three according to priority level
Enter or cut off the submodule.
Method scheme five, on the basis of method scheme four, the priority level according to the submodule accumulative operation
State determines, when put into submodule, accumulated running time short submodule is preferentially put into, accumulative to transport when cut off submodule
The row time submodule of length is preferentially cut off.
The beneficial effects of the present invention are: the invention proposes a kind of three-level type electric power electric transformer, by least by it
The submodule of multiple parallel connections is arranged in middle level-one, and the quantity of submodule investment or excision, this method are determined according to system output power
Control principle is simple, is effectively reducing loss at light load, the working efficiency of lifting system improves the service life of transformer.
By the way that priority level, the Cumulative Elapsed Time of each power modules of real-time statistics system, according to output power is arranged
Demand put into or cut off one by one submodule according to the length of accumulated running time, when each power module be effectively reduced averagely running
Between, lifting system puts into or cuts off voltage stability when submodule.
Detailed description of the invention
Fig. 1 is electric power electric transformer major loop and control framework schematic diagram.
Specific embodiment
A specific embodiment of the invention is further described with reference to the accompanying drawing.
A kind of embodiment of electric power electric transformer control method of the invention:
Electric power electric transformer of the invention is three-level type, including rectification stage, isolation level and inverse cascade, and rectification stage is as defeated
Enter end, including more than two rectification units, each rectification unit includes more than two AC/DC submodules in parallel；Isolation level
More than two isolated locations including output end parallel connection, each isolated location include more than two DC/DC submodules in parallel
Block；Inverse cascade includes an inversion unit, including more than two DC/AC submodules in parallel；Exchange between rectification unit
Side cascade, each rectification unit DC side are separately connected corresponding isolated location, connect after the output end of each isolated location is in parallel
Connect inversion unit.
For example, a kind of electric power electric transformer control system as shown in Figure 1, including three-level type electric power electric transformer and
Controller, the three-level of the electric power electric transformer are parallel with multiple submodule, i.e., each rectification unit is by more than two AC/DC
Submodule is formed in parallel, and isolated location is formed in parallel by more than two DC/DC submodules, and inversion unit is by more than two DC/AC
Submodule is formed in parallel.
Controller is used for rectification unit, isolated location and inversion unit, which distinguishes real-time statistics rectifier submodule
The Cumulative Elapsed Time of block, isolated converter submodule and inverter submodule, according to the demand of output power according to described tired
Count runing time investment or excision AC/DC submodule, DC/DC submodule, DC/AC submodule；Wherein, accumulated running time is short
AC/DC submodule, DC/DC submodule, DC/AC submodule are preferentially put into, AC/DC submodule, the DC/DC of accumulated running time length
Submodule, DC/AC submodule are preferentially cut off.
In Fig. 1, for rectification stage, is realized by m rectification unit cascade, consider power demand, each rectification unit is by n
AC/DC submodule composes in parallel, and AC/DC submodule uses H bridge or MMC circuit topology.
It for isolation level, is realized by m isolated location, the input port of each isolated location passes through the company of being connected in parallel with a capacitor
Connect the output end of corresponding rectification unit.Consider power demand and the connection with rectification unit, each isolated variable unit is by p
DC/DC submodule composes in parallel, and DC/DC submodule uses CLLC converter topology, CLLLC converter topology or phase-shifting full-bridge
Circuit topology.
For output stage, because voltage class is lower, does not need multiple inversion units and carry out in parallel, consideration power demand, often
A inversion unit is composed in parallel by q DC/AC submodule, wherein DC/AC submodule is opened up using two level or tri-level circuit
It flutters.
Above-mentioned each power modules pass through sampling and control interface and are connected with the controller in system, and system passes through intelligence
Suspend mode control technology controls the investment or excision of above-mentioned each power modules, realizes the reduction that transformer is lost at light load, specifically
Control method is as follows:
1) it when system output power gradually increases, puts into each submodule number in parallel and is gradually increased to whole from 1
Investment, conversely, each power modules are gradually cut off when overall output power is reduced, each submodule number for keeping investment in parallel
1 is gradually decrease to from whole；
2) time of each submodule accumulation operation of controller real-time statistics, the submodule for keeping accumulated running time short are preferentially thrown
Enter, the accumulated running time submodule of length is preferentially cut off.
Shown in FIG. 1 is a kind of buck Monophase electric power electronic transformer control system, power electronics transformation of the invention
Device control system is also possible to three-phase either single-phase, and connection type is three mutually isostructural Monophase electric power electronics in Fig. 1
The high-pressure side of transformer carries out corresponding star-like or triangle with low-pressure side and connects.
AC/DC submodule quantity, DC/DC submodule quantity and DC/AC submodule quantity can be identical in the present embodiment,
Can be different, but consider the power demand of control system, the quantity of above-mentioned submodule is preferably identical.
Electric power electric transformer as described in the examples be in three-level (rectification stage, isolation level and inverse cascade) every level-one by
The situation of multiple submodule parallel connection is also possible to wherein level-one or two-stage and is made of multiple submodule parallel connection, and controller is according to being
The demand and the length of submodule accumulated running time of system output power, put into one by one/cut off submodule.
The present invention is by using the accumulative operating condition of submodule as a kind of priority level, each power of real-time statistics system
The Cumulative Elapsed Time of submodule successively puts into or cuts off according to the length of accumulated running time according to the demand of output power
AC/DC submodule, DC/DC submodule and DC/AC submodule can be effectively reduced each power module average operating time, underloading
When the service life that reduces loss, improve system effectiveness and transformer.
Claims (8)
1. a kind of electric power electric transformer control method, which is characterized in that the electric power electric transformer is three-level type, including whole
Grade, isolation level and inverse cascade are flowed, level-one includes more than two submodules in parallel at least within；It is determined according to system output power
The submodule investment or the quantity of excision；
Put into according to priority level or cut off the submodule, the priority level according to the submodule accumulative operating status
It determines, when put into submodule, accumulated running time short submodule is preferentially put into, accumulative when running when cut off submodule
Between long submodule preferentially cut off.
2. electric power electric transformer control method according to claim 1, which is characterized in that the switching side of the submodule
Formula includes putting into or cutting off one by one.
3. electric power electric transformer control method according to claim 2, which is characterized in that in the three-level type
Two-stage or three-level include the electric power electric transformer of at least two submodules in parallel, investment at different levels described in synchronously control and excision
The quantity of module.
4. a kind of electric power electric transformer of the electric power electric transformer control method using claim 1, which is characterized in that institute
Stating electric power electric transformer is three-level type, including rectification stage, isolation level and inverse cascade, at least within level-one include it is more than two simultaneously
The submodule of connection.
5. electric power electric transformer according to claim 4, which is characterized in that the rectification stage includes more than two whole
Unit is flowed, each rectification unit includes more than two AC/DC submodules in parallel；The isolation level includes in parallel two of output end
A above isolated location, each isolated location include more than two DC/DC submodules in parallel；The inverse cascade includes one
A inversion unit, including more than two DC/AC submodules in parallel；Exchange side cascade between rectification unit, each rectification
Unit DC side is separately connected corresponding isolated location, connects the inversion unit after the output end of each isolated location is in parallel.
6. electric power electric transformer according to claim 5, which is characterized in that the AC/DC submodule using H bridge or
MMC circuit topology.
7. electric power electric transformer according to claim 5, which is characterized in that the DC/DC submodule is become using CLLC
Parallel operation topology, CLLLC converter topology or phase whole-bridging circuit topology.
8. electric power electric transformer according to claim 5, which is characterized in that the DC/AC submodule uses two level
Or tri-level circuit topology.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611124272.8A CN106655794B (en) | 2016-12-08 | 2016-12-08 | A kind of electric power electric transformer and its control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611124272.8A CN106655794B (en) | 2016-12-08 | 2016-12-08 | A kind of electric power electric transformer and its control method |
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| CN106655794A CN106655794A (en) | 2017-05-10 |
| CN106655794B true CN106655794B (en) | 2019-02-01 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107171578B (en) * | 2017-06-22 | 2019-07-30 | 中国科学院电工研究所 | Two Stages type AC-DC electric power electric transformer |
| CN108418413B (en) * | 2018-01-12 | 2020-02-28 | 青岛海尔空调电子有限公司 | Three-phase staggered PFC control method and system |
| CN110858754A (en) * | 2018-08-24 | 2020-03-03 | 中国电力科学研究院有限公司 | Two-stage control method and system of MMC type energy router |
| CN109088441B (en) * | 2018-10-10 | 2021-06-29 | 广东电网有限责任公司 | Power electronic transformer parallel operation optimal load power distribution calculation method and device |
| CN109245553B (en) * | 2018-10-19 | 2020-06-02 | 华北电力大学 | AC-AC conversion level modulation method for three-level modular power electronic transformer |
| CN111049183B (en) * | 2019-12-25 | 2022-09-06 | 国网江苏省电力有限公司电力科学研究院 | Split type power electronic transformer structure and flexible switching control method thereof |
| CN111371116B (en) * | 2020-02-19 | 2021-12-14 | 东南大学 | Power electronic transformer based on hybrid modular multilevel converter |
| CN115804002A (en) * | 2020-07-31 | 2023-03-14 | 华为数字能源技术有限公司 | Solid-state transformer and power supply system |
| CN115189550A (en) | 2021-04-01 | 2022-10-14 | 台达电子企业管理（上海）有限公司 | Control device and control method for power conversion system |
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| CN101707443B (en) * | 2009-11-20 | 2013-05-08 | 中国电力科学研究院 | Novel electric power electric transformer |
| KR101307205B1 (en) * | 2012-05-23 | 2013-09-11 | 주식회사 동아일렉콤 | Power supply device for load-sharing |
| CN104184356A (en) * | 2014-08-18 | 2014-12-03 | 国家电网公司 | Power module group of three-phase power electronic transformer |
| CN104362730A (en) * | 2014-10-24 | 2015-02-18 | 广东易事特电源股份有限公司 | Control method for promoting light load of UPS (Uninterrupted Power Supply) |
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Patent Citations (5)
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|---|---|---|---|---|
| CN101707443B (en) * | 2009-11-20 | 2013-05-08 | 中国电力科学研究院 | Novel electric power electric transformer |
| KR101307205B1 (en) * | 2012-05-23 | 2013-09-11 | 주식회사 동아일렉콤 | Power supply device for load-sharing |
| CN104184356A (en) * | 2014-08-18 | 2014-12-03 | 国家电网公司 | Power module group of three-phase power electronic transformer |
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| CN106655794A (en) | 2017-05-10 |
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