CN106505898A - Z sources NPC three-level inverter invariable power grid-connection control systems based on SVPWM - Google Patents
Z sources NPC three-level inverter invariable power grid-connection control systems based on SVPWM Download PDFInfo
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- CN106505898A CN106505898A CN201610973580.1A CN201610973580A CN106505898A CN 106505898 A CN106505898 A CN 106505898A CN 201610973580 A CN201610973580 A CN 201610973580A CN 106505898 A CN106505898 A CN 106505898A
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Classifications
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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
- H02M7/487—Neutral point clamped inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
-
- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The present invention relates to a kind of Z sources NPC three-level inverter invariable power grid-connection control systems based on SVPWM, including the Z sources NPC three-level inverters that are sequentially connected and LC wave filter, described grid-connection control system also includes the power limitation control module being sequentially connected and SVPWM control modules, described power limitation control module input is linked with the outfan of LC wave filter, and described SVPWM control modules outfan is connected with Z sources NPC three-level inverters；Described Z sources NPC three-level inverters are powered by DC source, are concurrently accessed electrical network and power limitation control module after LC filter filterings, access Z sources NPC three-level inverters by SVPWM control modules after the power limitation control resume module.Compared with prior art, the present invention can effectively reduce grid-connected current harmonic content, improve and network electric energy quality.
Description
Technical field
The present invention relates to novel grid-connected control strategy for inverter technical field, more particularly, to a kind of Z sources based on SVPWM
NPC three-level inverter invariable power grid-connection control systems.
Background technology
In recent years, with the extensive application and the development of micro-capacitance sensor technology of regenerative resource, novel grid-connected inverter topology
And its research of control strategy becomes focus.Z-source inverter is to add Z source networks to open up on the basis of basic inverter structure
Flutter, make the bridge arm direct pass of inverter become a kind of working condition such that it is able to realize that buck is converted, just need not in so controlling
Dead Time is inserted into, inversion efficiency is improve.Traditional Z sources two-level inverter by switch tube power and pressure limited,
It is not suitable for high-power occasion, limits the performance of boost capability.
Three-level inverter reduces the harmonic wave in electromagnetic interference and output voltage by increasing inverter circuit level number, opens
The half that the voltage born when pipe is turned off is only DC voltage is closed, and makes inverter switching device pipe be operated in low frequency state, switched
Loss is reduced, and is therefore used widely in large-power occasions.Z sources three-level inverter will be inverse for Z source networks three level of topological sum
Become device to combine, both advantages can be given full play to.But at present the cutting-in control of three level NPC inverter of Z sources is ground
Study carefully less.
Grid-connected Control Strategy is the key that renewable energy power generation accesses electrical network by inverter.Most of research at present is all
It is to realize that unity power factor is exported by improving control program, reactive power fan-out capability is not discussed.Invariable power control
System can make active, the reactive power tracking of inverter output set reference value, and exportable reactive power support line voltage, carries if necessary
High grid stability.This control strategy is applied to photovoltaic, the maximum power tracing of wind-powered electricity generation.Therefore, by power limitation control strategy
Z sources NPC three-level inverters are applied to, realize that the research of grid-connected inverters control is significant.
Content of the invention
The purpose of the present invention is exactly to provide a kind of Z based on SVPWM to overcome the defect of above-mentioned prior art presence
Source NPC three-level inverter invariable power grid-connection control systems.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of Z sources NPC three-level inverter invariable power grid-connection control systems based on SVPWM, including the Z sources being sequentially connected
NPC three-level inverters and LC wave filter, described grid-connection control system also include the power limitation control module that is sequentially connected and
SVPWM control modules, described power limitation control module input are linked with the outfan of LC wave filter, and described SVPWM is controlled
Molding block outfan is connected with Z sources NPC three-level inverters；
Described Z sources NPC three-level inverters are powered by DC source, are concurrently accessed electrical network and perseverance after LC filter filterings
Power control module, accesses Z sources NPC three-level inverters by SVPWM control modules after the power limitation control resume module.
Described Z sources NPC three-level inverters include the Z source networks being sequentially connected and three-level inverter, described Z sources
Network input is connected with DC source, and described SVPWM control module outfans are connected with three-level inverter.
Described power limitation control module includes that the abc coordinate systems being sequentially connected turn dq coordinate system units, Power Control list
Unit and current control unit, described abc coordinate systems are turned the input of dq coordinate system units and are connected with the outfan of LC wave filter,
The outfan of described current control unit is connected with SVPWM control modules.
The outfan of described current control unit turns abc coordinate systems unit and SVPWM control modules by dq coordinate systems
Connection.
Described SVPWM control modules substitute traditional zero vector using up/down shoot-through zero vector part.
Compared with prior art, the present invention has advantages below：
1) Z source structures can raise the output voltage of micro battery, while making pass-through state become a kind of working condition, eliminate
Impact of the dead band to inverter.
2) the grid-connected strategy of Z sources three-level inverter invariable power proposed by the present invention can make inverter output adjustable controllable, must
Exportable reactive power support line voltage when wanting, improves grid stability.With traditional two-level inverter power limitation control strategy phase
Than can effectively reducing grid-connected current harmonic content, improving and network electric energy quality.
Description of the drawings
Fig. 1 is the topological structure of Z sources NPC three-level inverters of the present invention；
Fig. 2 (a) is the SVPWM sequential charts of traditional three-level inverter；
Fig. 2 (b) is the SVPWM sequential charts of Z sources of the present invention three-level inverter；
Fig. 3 is Z sources NPC three-level inverters invariable power grid-connection control system block diagram of the present invention；
Fig. 4 is constant power controller structured flowchart of the present invention；
Fig. 5 is inverter output a phases phase voltage and line voltage described in the embodiment of the present invention；
Fig. 6 is that combining inverter described in the embodiment of the present invention exports active, reactive power waveform；
Fig. 7 (a) is embodiment of the present invention 0s～2s three-phase grid current waveforms；
Fig. 7 (b) is embodiment of the present invention 0.9s～1.1s three-phase grid current waveforms；
Fig. 8 is a phases grid-connected voltage current waveform described in the embodiment of the present invention；
Fig. 9 is grid-connected frequency waveform described in the embodiment of the present invention；
Figure 10 is three-level inverter power limitation control grid-connected current harmonic content in Z sources described in the embodiment of the present invention；
Figure 11 is traditional two-level inverter power limitation control grid-connected current harmonic content described in the embodiment of the present invention.
Specific embodiment
Accompanying drawing in below in conjunction with the embodiment of the present invention, to the embodiment of the present invention in technical scheme carry out clear, complete
Site preparation is described, it is clear that described embodiment is a part of embodiment of the present invention, rather than whole embodiments.It is based on this
Embodiment in bright, the every other reality obtained on the premise of creative work is not made by those of ordinary skill in the art
Example is applied, should all belong to the scope of protection of the invention.
The present invention on the basis of the structure and operation principle for analyzing Z sources NPC three-level inverters, by power limitation control
Strategy is incorporated in the cutting-in control of Z sources NPC three-level inverters, and achieves grid-connected inverters with reference to SVPWM modulation strategies
Control.
Topological structure of the Fig. 1 for Z sources NPC three-level inverters.In figure, DC source only 1, its voltage are Udc；Cs1
And Cs2For the derided capacitors of DC source, its value is Cs1=Cs2=Cs.Derided capacitors and tradition NPC three-level inverters it
Between, add by inductance L1、L2With electric capacity C1、C2The Z source networks of composition, the midpoint N of derided capacitors and the midpoint phase of NPC inverter
Even, the output voltage (also referred to as DC bus-bar voltage) of Z source networks is Ui.Additionally, adding diode VD1、VD2To realize straight-through
Reverse blocking effect during state.
Compared to SPWM control methods, SVPWM controls have the characteristics of dynamic response is fast, fluctuation is little, and SVPWM controlling parties
The DC voltage utilization rate of method is high, and harmonic content is few but increasingly complex.The SVPWM of Z sources NPC three-level inverters is in tradition
SVPWM on the basis of, substitute traditional zero vector with up/down shoot-through zero vector part, to realize boosting.Due to adding for Z
Source NPC three-level inverters and the upper and lower straight-through vector insertion unit that designs, the other parts of traditional SVPWM modulation algorithms
Therefore new change is occurred in that.For example：Vector calculating section action time, newly adds the calculating of straight-through vector time；Time
State assignment part, for realizing that the waveform of time state distribution is changed into 11 rank waveforms, such as Fig. 2 (a) from 7 original rank waveshapes
With Fig. 2 (b) Suo Shi.
Fig. 3 is tri- level grid-connected inverter power limitation control system block diagrams of Z sources NPC.In figure, L0And R0Respectively triple line
Road inductance and resistance, ufk(k=a, b, c) is the output voltage after inverter filtering, uk(k=a, b, c) be line voltage, ik(k
=a, b, c) it is line current.Z sources NPC three-level inverters are powered by DC source, access electrical network after LC filter filterings.Permanent
Power Control mainly includes dq conversion, 3 parts of Power Control and current control.
From the figure 3, it may be seen that grid-connected busbar voltage is represented by：
Formula (1) is transformed to rotation dq coordinate systems, is obtained：
In formula：Angular frequencies of the ω for circuit, ω=2 π f (f is mains frequency).
Under rotation dq coordinate systems, active, idle expression formula is：
Abc coordinates be tied in the Park Transformation of dq coordinate systems choose d axles equidirectional with voltage vector, q axles can be caused
Component of voltage is zero.Now, active power is only relevant with d axle watt currents, and reactive power is only relevant with q axle reactive currents.
Power expression is reduced to：
So power expression is decoupled, and thus can flow to the reference current i of feeder linedrefAnd iqrefFor：
Formula (2) is arranged and is obtained：
According to the structure that formula (5) and formula (6) can design constant power controller, as shown in Figure 4.
In order to verify feasibility and the effectiveness of the constant-power control method of three level grid-connected inverter of Z sources, in Matlab/
The Z sources NPC three-level inverter invariable power cutting-in control phantoms based on SVPWM have been built on Simulink software platforms,
And carry out simulation analysis research.Specifically simulation parameter is：Input direct voltage Udc=800V, switching frequency f=2.5kHz, direct current
Lateral capacitance Cs1=Cs2=100 μ F, Z source network electric capacity C1=C2=220 μ F, inductance L1=L2=1mH, leads directly to dutycycle D0=
0.167.Filter inductance Lf=12mH, filter capacitor Cf=0.06 μ F.Parameter K of PI controllersP=50, KI=100；Electrical network phase
Voltage is 220V, frequency is 50Hz.
(1) the output waveform analysis of Z sources three-level inverter
Fig. 5 is that inverter exports two phases line voltage waveform of a phases phase voltage and ab.Due to inserting straight-through amount (straight-through duty
Compare D0=0.167), step-up ratio B=1.5, output phase voltage peak value are about 600V, and line voltage peak value is about 1200V, with theoretical value
It is consistent.And the output line voltage peak value of traditional three-level inverter is not over 800V.As can be seen here, Z sources tri-level inversion
Device can achieve boosting output.As straight-through dutycycle is set-point, rather than from zero elevated consecutive variations value, so starting rank
There is the startup impact of a cycle in section.
(2) waveform correlation of invariable power cutting-in control
Setting simulation time is 2s, active power reference value Pref35kW, reactive power reference are risen to by 20kW in 1s
Value Qref5kVar is risen to by 0kVar in 1s.Fig. 6 is that combining inverter exports active, reactive power waveform.As seen from the figure,
The power setting value changes in 1s, active, reactive power can be followed and refer to value changes, and waveform is smoothed, and response speed is very fast.
Fig. 7 (a) and Fig. 7 (b) is three-phase grid current waveform.Reference power change shadow to electric current is checked for convenience
Ring, while giving waveform in simulation time 0.9s～1.1s.As seen from the figure, when with reference to changed power, grid-connected current is steady
Transition, wave time are very short.During stable state, the total harmonic distortion (THD) of grid-connected current about 2%, meets national standard THD<5%
Requirement.
Fig. 8 is three-phase grid voltage when value and power reference changes, current waveform.Due to the effect of bulk power grid, inverter is defeated
Go out voltage stabilization in 310V, harmonic content is only 0.2%.As seen from the figure, 0.9s～1s, grid-connected current are substantially same with grid-connected voltage
Phase；1s～1.1s, due to inverter output reactive power, grid-connected current is differed with grid-connected voltage phase place, due to now power
Factor is about 0.99, and therefore phase contrast is less.
Fig. 9 is grid-connected frequency oscillogram, and as seen from the figure, frequency had compared with minor swing in the incipient stage, and maximum offset is only
0.125Hz, and stable in 50Hz, changed power quickly, there are Slight undulations in grid-connected frequency, and stability is strong.
(3) compare with traditional two-level inverter power limitation control
In order to the grid-connected dominance of strategies of Z sources three-level inverter invariable power, the permanent work(to traditional two-level inverter are described
Rate cutting-in control has done emulation experiment, will both comparative analysiss.
Traditional two-level inverter invariable power cutting-in control emulation in, settings simulation time be 2s, input dc power
Pressure Udc1Parameter K of=600V, PI controllerP1=KI1=100, filtering parameter, three level of value and power reference situation of change and Z sources
Grid-connected inverters system is identical.
Figure 10, Figure 11 are respectively Z sources three-level inverter invariable power cutting-in control, the invariable power of traditional two-level inverter
The grid-connected current of control and its harmonic content analysis chart.Wherein：Harmonic content analysis chart have selected 5 cycles after system stability
Current waveform (red curve as in figure).As seen from the figure, Z sources three-level inverter power limitation control grid-connected current harmonic wave contains
Measure as 2.19%, far below traditional two-level inverter power limitation control grid-connected current harmonic content 3.95%, three electricity of Z sources is described
The grid-connected strategy of flat inverter power limitation control can effectively reduce grid-connected current harmonic distortion amount, improve and network electric energy quality.
The above, the only specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, various equivalent modifications can be readily occurred in or replaced
Change, these modifications or replacement should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with right
The protection domain of requirement is defined.
Claims (5)
1. a kind of Z sources NPC three-level inverter invariable power grid-connection control systems based on SVPWM, including the Z sources being sequentially connected
NPC three-level inverters and LC wave filter, it is characterised in that described grid-connection control system also includes the invariable power being sequentially connected
Control module and SVPWM control modules, described power limitation control module input are linked with the outfan of LC wave filter, described
SVPWM control modules outfan be connected with Z sources NPC three-level inverters；
Described Z sources NPC three-level inverters are powered by DC source, are concurrently accessed electrical network and invariable power after LC filter filterings
Control module, accesses Z sources NPC three-level inverters by SVPWM control modules after the power limitation control resume module.
2. a kind of Z sources NPC three-level inverter invariable power grid-connection control systems based on SVPWM according to claim 1,
Characterized in that, described Z sources NPC three-level inverters include the Z source networks being sequentially connected and three-level inverter, described
Z source network inputs are connected with DC source, and described SVPWM control module outfans are connected with three-level inverter.
3. a kind of Z sources NPC three-level inverter invariable power grid-connection control systems based on SVPWM according to claim 1,
Characterized in that, described power limitation control module includes that the abc coordinate systems being sequentially connected turn dq coordinate system units, Power Control
Unit and current control unit, the outfan of input and LC wave filter that described abc coordinate systems turn dq coordinate system units connect
Connect, the outfan of described current control unit is connected with SVPWM control modules.
4. a kind of Z sources NPC three-level inverter invariable power grid-connection control systems based on SVPWM according to claim 3,
Characterized in that, the outfan of described current control unit turns abc coordinate systems unit by dq coordinate systems controls mould with SVPWM
Block connects.
5. a kind of Z sources NPC three-level inverter invariable power grid-connection control systems based on SVPWM according to claim 3,
Characterized in that, described SVPWM control modules substitute traditional zero vector using up/down shoot-through zero vector part.
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| CN108683351A (en) * | 2018-06-08 | 2018-10-19 | 山东大学 | Hybrid modulation method, controller and the system of a kind of sources Z three-level inverter |
| CN113114058A (en) * | 2021-04-07 | 2021-07-13 | 中南林业科技大学 | Control method of switch inductor Z source neutral point embedded type three-level inverter |
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| CN113114058A (en) * | 2021-04-07 | 2021-07-13 | 中南林业科技大学 | Control method of switch inductor Z source neutral point embedded type three-level inverter |
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Application publication date: 20170315 |