CN109474008A - Blower grid-connected system based on mixing MMC and matrix converter - Google Patents
Blower grid-connected system based on mixing MMC and matrix converter Download PDFInfo
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- CN109474008A CN109474008A CN201811342672.5A CN201811342672A CN109474008A CN 109474008 A CN109474008 A CN 109474008A CN 201811342672 A CN201811342672 A CN 201811342672A CN 109474008 A CN109474008 A CN 109474008A
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Classifications
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- H02J3/386—
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- 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
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- 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
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Ac-Ac Conversion (AREA)
- Inverter Devices (AREA)
Abstract
Blower grid-connected system based on mixing MMC and matrix converter, including wind-driven generator, mixed type module multilevel converter (MMC), DC/AC inverter structure, high frequency transformer, matrix converter.The invention has the benefit that (1) saves switching device quantity, the advantage of Fault Isolation and economy has been taken into account；(2) transportation cost and installation difficulty are reduced, also reduction system loss improves system capacity utilization rate；(3) single-phase MMC inverter is used, the cost of 2 bridge arms can be reduced relative to three-phase MMC inverter；(4) matrix converter has the function of that energy in bidirectional flow is more suitable for the four-quadrant movement of motor, it is adjustable and unrelated with output load current to be able to achieve power factor, the independent adjusting of output voltage amplitude, phase and frequency, it is often more important that need not exist for the active component of DC link.
Description
Technical field
The present invention relates to the blower grid-connected systems based on mixing MMC and matrix converter
Background technique
The energy is the national economic development and the material base that people's lives are depended on for existence, in the past few decades in, establish
Energy system on the fossil fuels such as coal, petroleum, natural gas basis has greatly pushed the development of human society.But
While the mankind use fossil fuel, environment and the ecosystem to the earth also result in huge destruction.In recent years, the world is each
State gradually recognizes that clean energy resource takes various ways to administer worsening environment the importance of the mankind, and will exploitation benefit
Use renewable energy as the important content of sustainable development.
With being growing for wind-power electricity generation capacity, wind-power electricity generation more and more accesses power grid, and wind-powered electricity generation is incorporated into the power networks
Become it is extensive by wind energy it is most effective in the way of,.Regular alternating current power transmission mode is, Wind turbines are by the three-phase alternating current of sending
Electric energy is converted by AC-DC-AC frequency converter, then is boosted by three-phase main-frequency transformer, finally electricity is connected to the grid.And it is conventional
Converter structure be three phase full bridge structure, switch resistance to pressure it is poor, switching frequency is larger, while bring switching loss is big,
System availability is low.Most importantly bring harmonic content is too high, easily causes a large amount of harmonic alternating current electricity feed-in power grids, causes not
Necessary loss.
Infrastructure device of the power transformer as voltage transformation and electrical isolation is the core being connected to the network in electric system
The heart has application in transmission & distribution electrical domain.At present in system using it is more be iron core oil-immersed type transformer, along with user demand
Higher and higher, power supply reliability and power quality standard also increase accordingly, at this time the defect and deficiency of traditional core-type transformer
Highlight, mainly have: volume and weight is big, and insulating oil leakage can bring environmental problem；Grid side voltage falls, flickering, no
Balance or containing harmonic wave when, all will be coupled into load-side, and when load-side generates current harmonics and reactive power, it can directly feed back
Power grid is polluted to grid side；The failure of load-side cannot be isolated, so as to cause failure propagation to grid side, so needing
The relay protection device of special mouth；It due to noenergy storage capacity, is unable to maintain that transformer load side voltage is constant, loads and become rapidly
Load side voltage fluctuation is big when change or off-center operation.
There is configuration exchange side breaker, using with DC Line Fault ride-through capability for the DC Line Fault processing of the side MMC
Inverter two ways.Since exchange side breaker is mechanical switch, movement speed is slow, is unfavorable for inhibiting fault current and hand over straight
The recovery of streaming system；And there is modularization multi-level converter of the fault ride-through capacity based on full-bridge submodule, there are device mistakes
Although the poor problem of more economy, the modularization multi-level converter based on clamp Shuangzi module reduce number of devices, but
There are parallel coupleds in structure, and series-parallel two kinds different charged states occurs in bridge arm capacitor after being latched IGBT.
Summary of the invention
Goal of the invention:
The present invention provides a kind of blower grid-connected system based on mixing MMC and matrix converter, previous the purpose is to solve
The problems of.The invention proposes the blower grid-connected system based on mixing MMC and matrix converter, which uses mixing
MMC, matrix converter are high without using Industrial Frequency Transformer, flexible design, controllability.It is suitable for wind generator system and transmission effect
Rate is high, and structure is simple, while solving DC side failure.
Technical solution:
To achieve the goals above, the present invention adopts the following technical scheme:
AC power converter is the friendship-alternating current force transformation dress constituted using power electronic devices according to certain circuit topology
It sets.Since the 1980s, with the appearance of the high performance power electronic devices such as IGBT, power MOSFET, IGCT, alternating current
Force transducer achieves significant progress.Matrix converter is a kind of input, good output, it is not necessary to the energy storage ring of direct current
Section, energy being capable of two-way flows, it may be achieved " green " frequency converter of real four quadrant running both can produce energy-efficient great
Economic benefit in turn avoids the problems such as environmentally friendly because of harmonic pollution bring electric system, while being also very suitable for AC excitation hair
The demand of electric system, therefore research significance is far-reaching.
Blower grid-connected system based on mixing MMC and matrix converter includes that how electric wind-driven generator, mixed type moduleization be
Wherein, it is whole that wind-driven generator is connected to AC/DC for flat inverter (MMC), DC/AC inverter structure, high frequency transformer, matrix converter
It flows on device, wind-driven generator converts wind energy into the electric energy of three-phase alternating current form, and the AC signal of power frequency input turns through over commutation
Direct current is turned to, direct current is modulated to high frequency square wave by inverter structure, completes a raising frequency, modulated signal adds to high-frequency isolation
The primary side of transformer, is coupled to secondary side, and the high-frequency alternating current transmitted is defeated by the exchange that matrix converter is changed into power frequency
Out, the alternating current of output is finally fed into power grid.
Mix MMC in, each bridge arm not only included full-bridge submodule (FBSM) but also include half-bridge submodule (HBSM) this
The advantage of the kind existing half-bridge submodule economy of topological structure, and used full-bridge submodule simultaneously and bipolar short trouble is isolated
Ability.
Half-bridge submodule is that IGBT diode in parallel forms a group, between two groups of half-bridge submodule
IGBT series connection forms a circuit after two IGBT series connection, and then this circuit is in parallel with capacitor C again, and half-bridge submodule is just
There are 2 kinds of operating modes in normal situation.Full-bridge submodule has 4 IGBT, 4 diodes, its structure is connect with half-bridge submodule
Relationship is identical, and each capacitor C corresponds to one in parallel concatenated IGBT circuit two-by-two, identical with half-bridge submodule connection relationship, entirely
Bridge submodule has 3 kinds of operating modes under normal circumstances；When DC side breaks down, all IGBT are latched, then submodule enters
Fail operation mode；Under fail operation mode, in full-bridge submodule, fault current, which has to pass through capacitor C, could constitute access,
And in half-bridge submodule, the electric current of one-way flow can need not pass through capacitor C；By capacitor C, full-bridge submodule can isolate short circuit
Failure.
DC/AC inverter structure is single-phase MMC converter.
High frequency transformer is small in size relative to Industrial Frequency Transformer, high-efficient, high power density, it is at low cost, have fabulous heat
Dissipation characteristic, not only there is low leakage inductance, and fabulous high frequency characteristics, and dielectric strength is high.
Matrix converter is a kind of AC/AC converter, and the rectifier of the high frequency transformer secondary side of script and inverse is omitted
Become device, simplifies structure.
Rectifier of the mixed type module multilevel converter as system.
The high-pressure side of high frequency transformer is connected to the midpoint of the bridge circuit of inverter device formation.
Matrix converter topological structure is three-phase-three-phase matrix converter.
The operating mode of half-bridge submodule is as follows when normal operation:
All operating modes of full-bridge submodule are as follows when normal work:
Advantageous effect:
The invention has the benefit that
(1) mixed type MMC combination half-bridge submodule and the respective advantage of full-bridge submodule, in 6 bridge arms point of converter valve
A certain number of semi-bridge types and bridge-type submodule are not set, submodule mixed type converter valve is constituted.This converter valve both can be with
The function of realizing the bipolar short trouble in isolated DC side, while can save switching device quantity again, taken into account Fault Isolation and
The advantage of economy；
(2) since inverter can convert electric energy into as high-frequency alternating current, which can use small in size, weight
Light medium-high frequency step-up transformer.Transportation cost and installation difficulty are reduced, also reduction system loss improves system capacity and utilizes
Rate；
(3) single-phase MMC can be used for dispersion low capacity wind power plant by topology formations such as single-phase MMC inverters in inverter
Three-phase MMC inverter can be used in inverter save the cost, larger capacity wind power plant, for dispersing low capacity wind power plant, single-phase MMC
Inverter is able to satisfy power transmission demand.Using single-phase MMC inverter, 2 bridges can be reduced relative to three-phase MMC inverter
The cost of arm；
(4) matrix converter has the function of that energy in bidirectional flow is more suitable for the four-quadrant movement of motor, is able to achieve power
Factor adjustable is simultaneously unrelated with output load current, the independent adjusting of output voltage amplitude, phase and frequency, it is often more important that
Need not exist for the active component of DC link.
Detailed description of the invention
Fig. 1 is blower grid-connected system overall plan figure
Fig. 2 is the topological diagram of the mixing MMC of blower grid-connected system
Fig. 3 is the connection figure of blower grid-connected system single-phase MMC and high frequency transformer
Fig. 4 is the circuit topology figure of matrix converter in blower grid-connected system
The connection figure of MMC, single-phase MMC, high flat transformer and matrix converter are mixed in Fig. 5 blower grid-connected system
Specific embodiment
The present invention relates to a kind of new wind electric converter topological structure MMC based on mixing MMC and matrix converter to be
The abbreviation of Modular Multilevel Converter-- modular multi-level converter.The topological structure uses modularization chain
Formula cascaded structure, as shown in Figure 1, rectification side module valve group is directly connect with generator unit stator side.Rectification side passes through with inverter side
DC bus connection, inverter side connect the primary side of high frequency transformer, and the secondary side of transformer is connected with matrix converter, square
Battle array converter is directly connected to power grid.The advantages of system be it is environmental-friendly, structure is simple, take up little area, transless oil, pollution
It is few；Former secondary voltage amplitude can be kept constant, and fluctuation not occur because loading switching；High and low pressure side AC wave shape harmonic wave is abnormal
Variability is small, and essentially sinusoidal, power factor controlling is flexible, basic to realize the transmission of unit factor；The part function of breaker can be achieved
Can, moment turns off fault current, and protective relaying device is compared with traditional transformer relative simplicity；It is able to suppress the two-way flow of harmonic wave,
And switching frequency is lower, and switching loss is smaller, and system availability is higher.To achieve the above object, the present invention passes through following skill
Art scheme is realized:
Blower grid-connected system based on mixing MMC and matrix converter, it is characterised in that: the system includes wind-power electricity generation
Machine, mixing MMC, DC/AC inverter structure (unidirectional MMC), high frequency transformer and matrix converter, wherein wind-driven generator is connected to
It mixes on MMC, mixing MMC connection unidirectional MMC, unidirectional MMC are connected to matrix converter, matrix converter by high frequency transformer
Connect power grid.
Wind-driven generator is connected on AC/DC rectifier, and wind-driven generator converts wind energy into the electricity of three-phase alternating current form
Can, the AC signal of power frequency input is converted into direct current through over commutation, and direct current is modulated to high frequency square wave by inverter structure, completes one
Secondary raising frequency, modulated signal add to the primary side of high-frequency isolation transformer, are coupled to secondary side, the high-frequency alternating current warp transmitted
The exchange output that matrix converter is changed into power frequency is crossed, the alternating current of output is finally fed into power grid.
It mixes in MMC, each bridge arm had not only included full-bridge submodule (FBSM) but also included half-bridge submodule (HBSM).
Half-bridge submodule is that IGBT diode in parallel forms a group, between two groups of half-bridge submodule
IGBT series connection forms a circuit after two IGBT series connection, and then this circuit is in parallel with capacitor C again, and half-bridge submodule is just
There are 2 kinds of operating modes in normal situation.
Full-bridge submodule has 4 IGBT, and 4 diodes, its structure and half-bridge submodule connection relationship is identical, Mei Ge electricity
Hold corresponding one in parallel of C concatenated IGBT circuit two-by-two, full-bridge submodule normal condition identical with half-bridge submodule connection relationship
Under have 3 kinds of operating modes；When DC side breaks down, all IGBT are latched, then submodule enters fail operation mode；Failure
Under operating mode, in full-bridge submodule, fault current, which has to pass through capacitor C, could constitute access, and in half-bridge submodule, it is single
It can need not pass through capacitor C to the electric current of circulation；By capacitor C, full-bridge submodule can isolate short trouble.
As shown in Figure 2: setting each bridge arm has N number of submodule, and wherein half-bridge submodule has N/2, and full-bridge submodule has N/2
It is a；According to the working principle of MMC, which is N+1 level current transformer.Referring to Fig. 2 full-bridge submodule and half-bridge submodular circuits
Figure, all operating modes of half-bridge submodule when table 1 lists normal operation, full-bridge submodule is all when table 2 lists normal work
Operating mode: (each bridge arm had not only included full-bridge submodule (FBSM) but also had included half-bridge submodule (HBSM))
1 half-bridge submodule operating mode of table
2 full-bridge submodule operating mode of table
Half-bridge submodule contains 2 IGBT, and 2 diodes have 2 kinds of operating modes under normal circumstances；Full-bridge submodule has 4
IGBT, 4 diodes have 3 kinds of operating modes under normal circumstances.When DC side breaks down, all IGBT are latched, then submodule
Block enters fail operation mode.Under fail operation mode, in full-bridge submodule, fault current has to pass through capacitor C could structure
At access, and in half-bridge submodule, the electric current of one-way flow can need not pass through capacitor C；By capacitor C, full-bridge submodule can be with
Short trouble is isolated.
As shown in Figure 3: inverter can be used dispersion low capacity wind power plant by topology formations such as single-phase MMC inverters
Single-phase MMC inverter save the cost.
For dispersing low capacity wind power plant, single-phase MMC inverter is able to satisfy power transmission demand.It is changed using single-phase MMC
Device is flowed, the cost of 2 bridge arms can be reduced relative to three-phase MMC inverter.
Since inverter can convert electric energy into as high-frequency alternating current, which can use small in size, light-weight
High frequency transformer.Transportation cost and installation difficulty are reduced, also reduction system loss improves system capacity utilization rate.
The matrix converter circuit structure and topology that three-phase input is exported to three-phase are as shown in Figure 4, and wherein S1-S4 is four-quadrant
Power switch is limited, for blocking the voltage and current of any direction.When controlling matrix converter, detection three-phase is first had to
Then input voltage calculates the turn-on time of each power switch according to required output voltage size, goes to control each
Switching tube, to obtain output voltage.Matrix converter be it is a kind of using high frequency PWM technique by the multiphase of optional frequency and voltage
Power supply is directly changed into the AC/AC converter of another power supply, with input current waveform is good, power factor is high, bidirectional power
Stream can be higher or lower than input voltage frequency without intermediate energy storage link, output voltage frequency, control the features such as complicated.
As shown in Figure 5: the rectification of system and inverter module are all made of the multiple-level serially connected structure of chained block, single by multiple sons
Member is connected in series, and low-voltage AC is converted to direct current by rectification side, and inverter side is connect with high frequency transformer, is by DC conversion
High frequency transformer and matrix converter are connected to power grid by the alternating current of high frequency, which can be achieved the transmission of unit factor；It can be real
The partial function of existing breaker, moment turn off fault current, and switching frequency is lower, and switching loss is smaller, and system availability is higher.
Traditional transformer is substituted in its medium/high frequency transformer, reduces the volume of transformer very much, and the use of matrix converter replaces
Two rectification, inversion links simplify step for system, while also improving efficiency for system.
Claims (6)
1. based on mixing MMC and matrix converter blower grid-connected system, it is characterised in that: the system include wind-driven generator,
MMC, DC/AC inverter structure (unidirectional MMC), high frequency transformer and matrix converter are mixed, wherein wind-driven generator is connected to mixed
It closes on MMC, mixes the unidirectional MMC of MMC connection, DC/AC inverter structure (unidirectional MMC) is connected to matrixing by high frequency transformer
Device, matrix converter connect power grid.
2. the blower grid-connected system according to claim 1 based on mixing MMC and matrix converter, it is characterised in that: wind
Power generator is connected on AC/DC rectifier, and wind-driven generator converts wind energy into the electric energy of three-phase alternating current form, power frequency input
AC signal be converted into direct current through over commutation, direct current is modulated to high frequency square wave by inverter structure, completes a raising frequency, modulates
Signal afterwards adds to the primary side of high-frequency isolation transformer, is coupled to secondary side, and the high-frequency alternating current transmitted passes through matrixing
Device is changed into the exchange output of power frequency, and the alternating current of output is finally fed into power grid.
3. the blower grid-connected system according to claim 1 or 2 based on mixing MMC and matrix converter, it is characterised in that:
It mixes in MMC, each bridge arm had not only included full-bridge submodule (FBSM) but also included half-bridge submodule (HBSM).
Half-bridge submodule is that IGBT diode in parallel forms a group, the IGBT between two groups of half-bridge submodule
Series connection forms a circuit after two IGBT series connection, and then this circuit is in parallel with capacitor C again, the positive reason of half-bridge submodule
There are 2 kinds of operating modes under condition.
Full-bridge submodule has 4 IGBT, and 4 diodes, its structure and half-bridge submodule connection relationship is identical, each capacitor C
One in parallel concatenated IGBT circuit two-by-two is corresponded to, identical with half-bridge submodule connection relationship, full-bridge submodule is under normal circumstances
There are 3 kinds of operating modes；When DC side breaks down, all IGBT are latched, then submodule enters fail operation mode；Failure work
Under operation mode, in full-bridge submodule, fault current, which has to pass through capacitor C, could constitute access, and in half-bridge submodule, unidirectionally
The electric current of circulation can need not pass through capacitor C；By capacitor C, full-bridge submodule can isolate short trouble.
4. the blower grid-connected system according to claim 3 based on mixing MMC and matrix converter, it is characterised in that: just
Often the operating mode of half-bridge submodule is as follows when operation:
All operating modes of full-bridge submodule are as follows when normal work:
。
5. the blower grid-connected system according to claim 1 based on mixing MMC and matrix converter, it is characterised in that: DC/
AC inverter structure is single-phase MMC converter.
6. the blower grid-connected system according to claim 1 based on mixing MMC and matrix converter, it is characterised in that: square
Battle array converter is a kind of AC/AC converter.
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| WO2021047130A1 (en) * | 2019-09-10 | 2021-03-18 | 东南大学 | Modular multi-level converter-based high-power motor driving system |
| US11121641B1 (en) | 2019-09-10 | 2021-09-14 | Southeast University | High-power machine drive system based on modular multilevel converter |
| CN113054856A (en) * | 2019-12-27 | 2021-06-29 | 新疆金风科技股份有限公司 | Converter valve tower, converter system and wind generating set |
| CN113054856B (en) * | 2019-12-27 | 2022-08-23 | 新疆金风科技股份有限公司 | Converter valve tower, converter system and wind generating set |
| CN112701886A (en) * | 2020-12-07 | 2021-04-23 | 中国科学院电工研究所先进电磁驱动技术研究院 | Modular energy router, control method, device and medium |
| CN117097183A (en) * | 2023-09-22 | 2023-11-21 | 国网智能电网研究院有限公司 | AC-DC converter and system |
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