CN105576706B - The pre-assembled substation room of five phase photovoltaic DC-to-AC converters and its control method - Google Patents
The pre-assembled substation room of five phase photovoltaic DC-to-AC converters and its control method Download PDFInfo
- Publication number
- CN105576706B CN105576706B CN201610169822.1A CN201610169822A CN105576706B CN 105576706 B CN105576706 B CN 105576706B CN 201610169822 A CN201610169822 A CN 201610169822A CN 105576706 B CN105576706 B CN 105576706B
- Authority
- CN
- China
- Prior art keywords
- photovoltaic
- mrow
- phase
- converters
- msub
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 38
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052802 copper Inorganic materials 0.000 claims abstract description 4
- 239000010949 copper Substances 0.000 claims abstract description 4
- 239000013598 vector Substances 0.000 claims description 83
- 230000009471 action Effects 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 6
- 238000011161 development Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 229910002056 binary alloy Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000003137 locomotive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- H02J3/383—
-
- 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
-
- 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
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
-
- 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 invention discloses a kind of pre-assembled substation room of five phase photovoltaic DC-to-AC converters and its control methods.The pre-assembled substation room of five phases photovoltaic DC-to-AC converter includes five phase photovoltaic DC-to-AC converters, transformer, inverter room and transformer room, wherein the photovoltaic DC-to-AC converter is arranged in inverter room, transformer be arranged in transformer room and inverter room and transformer room between connected by copper bar.Five phase photovoltaic DC-to-AC converters include dc circuit breaker, DC/DC converters, five phase inverter bridges, five phase filters and AC circuit breaker, wherein, the output terminal of dc circuit breaker is electrically connected with the input terminal of DC/DC converters, the output terminal of DC/DC converters is electrically connected with the input terminal of five phase inverter bridges, the output terminal of five phase inverter bridges is electrically connected with five phase filters and five phase filters are electrically connected with AC circuit breaker.The pre-assembled substation room of the present invention has the advantages that the harmonic component in linear modulation scope big, DC power supply utilization rate height and output voltage and electric current is low.
Description
Technical field
The present invention relates to field of photovoltaic power generation, and in particular to the pre-assembled substation room of five phase photovoltaic DC-to-AC converters of one kind and its control
Method.
Background technology
Solar energy has many advantages, such as safe and clean and resource generality, can become substitute that fossil energy is main can be again
The raw energy.Solar energy power generating is used as world community already in its developmental research, market development and industrialized manufacture technology
The focus of keen competition.
Ground photovoltaic generating system is typically by photovoltaic array, header box, photovoltaic DC-to-AC converter, box-type substation and booster stations
Five parts form.When this system is applied to photovoltaic generating system, there is the defects of integration degree is low, equipment failure rate is high.
With the large-scale development of photovoltaic industry, the pre-assembled substation room that photovoltaic DC-to-AC converter and box-type substation are composed has become existing
For the trend of photovoltaic industry era development.
But traditional pre-assembled substation room still has that capacity is small, transformation efficiency is low etc. in actual moving process to be lacked
Point, this, which has become, restricts photovoltaic plant to intelligent, modular development bottleneck.Simultaneously as power electronic devices is wide
General application causes electric power system no longer to be limited by traditional three phase supply number of phases, multiphase system (system that the number of phases is more than three-phase)
It gets the attention.Multiphase system improves the output power of whole system, is particularly suitable for applying and electric locomotive traction, ship
The fields such as oceangoing ship electric propulsion, aerospace.
The defects of current substation room, is in particular in：
First, requirement commissioning staff in traditional pre-assembled substation room must debug inverter inside equipment, prestige
The personal safety of side of body personnel；
Secondly, secondary control system uses singlechip technology or DSP control technologies, and master control borad is subject to layout structure, system
The influence of the version factors such as technique and device quality is apparent, and poor anti jamming capability is not easy to extend, and accident rate is higher, to ambient enviroment
Dependence is strong, and the construction cycle is long.
Again, the defects of three phase inverter bridge inversion：1., inverter is by direct current when being converted to industrial-frequency alternating current, harmonic wave contains
Amount is high, and transfer efficiency is low；2., the capacity of inverter it is small, be unsuitable for the extensive, photovoltaic array of large capacity.
The content of the invention
The object of the present invention is to provide a kind of pre-assembled substation room of five phase photovoltaic DC-to-AC converters and its control method, so as to solve
Above-mentioned problems of the prior art.
To solve the above-mentioned problems, according to an aspect of the invention, there is provided a kind of five phase photovoltaic DC-to-AC converters are pre-assembled
Substation room, the pre-assembled substation room of five phases photovoltaic DC-to-AC converter include five phase photovoltaic DC-to-AC converters, transformer, inverter room and change
Depressor room, wherein the photovoltaic DC-to-AC converter is arranged in the inverter room, the transformer is arranged in the transformer room,
And it is connected between the inverter room and the transformer room by copper bar；And the five phases photovoltaic DC-to-AC converter includes direct current
Breaker, DC/DC converters, five phase inverter bridges, five phase filters and AC circuit breaker, wherein, the dc circuit breaker
Output terminal is electrically connected with the input terminal of the DC/DC converters, the output terminal of the DC/DC converters and the five phases inverter bridge
Input terminal electrical connection, the output terminal of the five phases inverter bridge be electrically connected with five phase filter and five phase filter
Device is electrically connected with the AC circuit breaker.
It is preferred that the five phases photovoltaic DC-to-AC converter has 1/4 working method and 2/3 working method；Wherein
1/4 working method refers to that at a time the upper bridge arm of the five phases inverter bridge has one to be conducted, lower bridge arm
There are four to be conducted or the upper bridge arm of the five phases inverter bridge has four to be conducted, lower bridge arm has one to be conducted；And
2/3 working method refers to that at a time the upper bridge arm of the five phases inverter bridge has two to be conducted, lower bridge arm
There are three to be conducted or the upper bridge arm of the five phases inverter bridge has three to be conducted, lower bridge arm has two to be conducted.
It is preferred that in 1/4 working method and 2/3 working method, the mutually adjacent and lower bridge arm of upper bridge arm conducting
Conducting it is mutually adjacent.
It is preferred that the five phases photovoltaic DC-to-AC converter further includes SPWM modules and PMU modules, wherein the SPWM modules pass through
Control line connects with the five phases inversion bridging, and the PMU modules are connected by signal wire with the SPWM modules, during operation, institute
It states PMU modules and sends instructions to the SPWM modules, the SPWM modules control the IGBT pipe break-makes of five phase inverter bridges, so as to
To desired voltage signal.
It is preferred that the PMU modules and SPWM modules are electrically connected to a power source.
It is preferred that the SPWM modules are equipped with the circuit for performing procedure below：
(1) switching equation of five phase photovoltaic DC-to-AC converters is established：S=[Sa, Sb, Sc, Sd, Se], wherein, Sm=1 represents photovoltaic
The conducting of inverter m phase bridge arms upper switch, lower switch shut-off, Sm=0 represents upper switch shut-off, wherein lower switch conducting, m=a, b,
C, d or e；
(2) the pole tension equation of five phase photovoltaic DC-to-AC converters is established：uk0=SmUd-Ud/ 2, wherein UdRepresent inverter bridge input terminal
DC voltage；
(3) the voltage vector equation of five phase photovoltaic DC-to-AC converters is established：
(4) 32 voltage vectors of five phase photovoltaic DC-to-AC converters are obtained, which includes big vector ULi, i is >=1
And≤10 integer, middle vector UMj, j be >=1 and≤10 integer, small vector USn, n is >=1 and≤10 integer and two
A zero vector U0, wherein 32 voltage vectors are scattered in 10 sectors, each sector includes two big vector, swears in two
Amount, two small vectors and a zero vector；
(5) synthesized reference voltage Uref：If reference voltage UrefPositioned at k-th of sector, U is selectedL(k+1)、UMk、UM(k+2)And
One zero vector carrys out synthesized reference voltage Uref；
(6) voltage U is obtainedL(k+1)、UMk、UM(k+2)And U0Action time.
It is preferred that the five phases photovoltaic DC-to-AC converter further includes direct current EMC wave filters, the direct current EMC wave filters are arranged on
Between the dc circuit breaker and the DC/DC converters, wherein the input terminal of the direct current EMC wave filters breaks with the direct current
The input terminal of the output terminal electrical connection of road device and the output terminal and the DC/DC converters of the direct current EMC wave filters is electrically connected
It connects.
It is preferred that the five phases photovoltaic DC-to-AC converter further includes exchange EMC wave filters, the exchange EMC wave filters are arranged at
Between five phase filter and the AC circuit breaker, wherein the input terminal of the exchange EMC wave filters is filtered with five phase
The input terminal of the output terminal and the AC circuit breaker of the output terminal electrical connection of ripple device and the exchange EMC wave filters is electrically connected
It connects.
According to another aspect of the present invention, a kind of controlling party in the pre-assembled substation room of five phases photovoltaic DC-to-AC converter is additionally provided
Method the described method comprises the following steps：
(1) switching equation of five phase photovoltaic DC-to-AC converters is established：S=[Sa, Sb, Sc, Sd, Se], wherein, Sm=1 represents photovoltaic
Inverter m phase bridge arms upper switch turns on, lower switch shut-off；Sm=0 represents upper switch shut-off, lower switch conducting, m=a, b, c, d
Or e；
(2) the pole tension equation of five phase photovoltaic DC-to-AC converters is established：uk0=SmUd-Ud/ 2, wherein UdRepresent inverter bridge input terminal
DC voltage；
(3) the voltage vector equation of five phase photovoltaic DC-to-AC converters is established：
(4) 32 voltage vectors of five phase photovoltaic DC-to-AC converters are obtained, which includes big vector ULi, i is >=1
And≤10 integer, middle vector UMj, j be >=1 and≤10 integer, small vector USn, n is >=1 and≤10 integer and two
A zero vector U0, wherein 32 voltage vectors are scattered in 10 sectors, each sector includes two big vector, swears in two
Amount, two small vectors and a zero vector；
(5) synthesized reference voltage Uref：If reference voltage UrefPositioned at k-th of sector, U is selectedL(k+1)、UMk、UM(k+2)And
One zero vector U0Carry out synthesized reference voltage Uref；
(6) voltage U is obtainedL(k+1)、UMk、UM(k+2)And U0Action time.
It is preferred that voltage U is obtained by following stepsL(k+1)、UMk、UM(k+2)And U0Action time：
It is located at a switch periods TsThe action time of interior k-th of vector is Tk, establish vector balancing side in k-th of sector
Journey：
So as to which T be obtainedL(k+1)、T(M+2)k、TMkAnd T0。
It is preferred that voltage UL(k+1)、UMk、UM(k+2)And U0Sequence of operation be：UMk→UL(k+1)→UM(k+2)→U0→
UM(k+2)→UL(k+1)→UMk。
It is preferred that as the UrefDuring positioned at first sector, voltage UM1、UL2、UM3And U0Sequence of operation be UM1
(10000)→UL2(11000)→UM3(01000)→U0(00000)→UM3(01000)→UL2(11000)→UM1(10000)。
The five phase photovoltaic DC-to-AC converters of the present invention possess following advantage：
(1) five phase control system is bigger than the modulation index of conventional three-phase system, therefore the linear tune of five phase photovoltaic DC-to-AC converters
Scope bigger processed, DC power supply utilization rate higher；
Harmonic component in (2) five phase photovoltaic DC-to-AC converter output voltages and electric current reduces；
(3) when the phase in five phases or a few phases break down, by appropriate control, photovoltaic DC-to-AC converter still can be by work(
Rate is started and run, and system reliability is high；
(4) transformation efficiency and grid connection capacity of photovoltaic DC-to-AC converter are improved to greatest extent.
Description of the drawings
Fig. 1 is the topology diagram in the pre-assembled substation room of five phase photovoltaic DC-to-AC converters of the invention；
Fig. 2 is the side schematic view in the pre-assembled substation room of five phase photovoltaic DC-to-AC converters of the invention；
Fig. 3 is the floor map in the pre-assembled substation room of five phase photovoltaic DC-to-AC converters of the invention；
Fig. 4 is the topology diagram of five phase photovoltaic DC-to-AC converters of the invention；
Fig. 5 is the space voltage vector figure of five phase photovoltaic DC-to-AC converters of the invention, and wherein small voltage vector is not shown；And
Fig. 6 is the PWM waveform figure of the first sector obtained by the five phase photovoltaic DC-to-AC converter control methods of the present invention.
Specific embodiment
Presently preferred embodiments of the present invention is described in detail below with reference to attached drawing, to become apparent from understanding the present invention's
Objects, features and advantages.It should be understood that embodiment shown in the drawings does not limit the scope of the present invention, and it is simply
Illustrate the connotation of technical solution of the present invention.
Term explanation
Substation room：By the electrical equipment that photovoltaic DC-to-AC converter and box-type substation become one, the system is by photovoltaic arrays
The DC conversion of generation is alternating current, and completes once boosting supply power grid and use.
Photovoltaic DC-to-AC converter：Inverter is to connect resistance capacitance by power electronic devices (MOSFET, IGBT etc.), with pulse
The direct current that header box transmission comes is transformed into alternating current, while completes photovoltaic by the break-make of the mode control device of width modulated
The MPPT maximum power point tracking (MPPT) of component ensures intelligent control and anti-islanding effect etc..
DC/DC converters：It realizes the boosting to photovoltaic array, while completes the tracking to photovoltaic array Maximum Power Output
(MPPT)。
Inverter bridge：Using full bridge structure, direct current is converted into industrial-frequency alternating current.
Fig. 1 is the system schematic in the pre-assembled substation room of five phase photovoltaic DC-to-AC converters of the invention, and Fig. 2 five phase photovoltaics of the present invention are inverse
Become the side schematic view in the pre-assembled substation room of device.Fig. 3 is the plane signal in the pre-assembled substation room of five phase photovoltaic DC-to-AC converters of the invention
Figure.As shown in Figures 1 to 3, the pre-assembled substation room of five phase photovoltaic DC-to-AC converters includes two photovoltaic DC-to-AC converters 100, transformer 200, inverse
Become device room 100A, transformer room 9 and hyperbaric chamber 11, wherein two photovoltaic DC-to-AC converters 100 are electrically connected by conducting wire and transformer 200
It connects.
Five phase photovoltaic DC-to-AC converters 100 are arranged in the 100A of inverter room, transformer 200 be arranged in transformer room 9 and
The relay (not shown) of arrester, lightning-arrest counter and detection power transformer interior fault is arranged in hyperbaric chamber 11.From photovoltaic
The direct current that component transmits becomes alternating current after five phase light inverters 100 and is conveyed to transformer 200, in transformer 200
It is transferred to after being boosted in hyperbaric chamber 11, and is connected in hyperbaric chamber 11 by terminal with being connected to the conducting wire of power grid, so as to
Electric current after inverter 100 carries out commutation is connected to the grid.
As shown in figures 2-3, inverter room 100A includes direct current remittance line cabinet 1, inverter bridge room 4, filter chamber 5 and exchange
Remittance line cabinet 7, wherein dc circuit breaker 10 are arranged in direct current remittance line cabinet 1,20 and five phase inverter bridge 30 of DC/DC converters is arranged at
In inverter bridge room 4, five phase filters 40 are arranged in filter chamber 5 and AC circuit breaker 50 is arranged at exchange and converges in line cabinet 7.
Direct current remittance line cabinet 1 offers window 1A, and inverter bridge room 4 offers window 4A, and filter chamber 5 offers window 5A,
Exchange remittance line cabinet 7 offers window 7A, and hyperbaric chamber 11 offers window 11A, can be right respectively by window 1A, 4A, 5A and 7A
Dc circuit breaker 10, DC/DC converters 20, five phase inverter bridges 30, five phase filters 40 and AC circuit breaker 50 are operated.
Radiator (not shown) is equipped in direct current remittance line cabinet 1, radiator 4B is equipped in inverter bridge room 4, is being filtered
Radiator 5B is equipped in ripple device room 5 and is equipped with radiator 7B in exchange remittance line cabinet 7.It is converged by direct current in line cabinet 1
The effect of radiator and radiator 4B, 5B and 7B can prevent direct current remittance line cabinet 1, inverter bridge room 4, filter chamber 5
And the temperature of exchange remittance line cabinet 7 is excessively high.
As shown in figure 4, the five phase photovoltaic DC-to-AC converters 100 of the present invention generally include dc circuit breaker 10, DC/DC converters
20th, five phase inverter bridges 30, five phase filters 40 and AC circuit breaker 50, wherein, the output terminal and DC/DC of dc circuit breaker 10
The input terminal electrical connection of converter 20, the output terminal of DC/DC converters 20 are electrically connected with the input terminal of five phase inverter bridges 30, five phases
The output terminal of inverter bridge 30 is electrically connected with the input terminal of five phase filters 40, the output terminal and AC circuit breaker of five phase filters 40
50 input terminal electrical connection, wherein, DC/DC converters realize the raising to photovoltaic array output voltage, complete maximum power point
Tracking (MPPT).
Five phase inverter bridges 30 include 10 IGBT switching tubes：S1~S10, five phase filters 40 are using RLC mode filters, R generations
The internal resistance of table wave filter and as the loss of voltage caused by every phase bridge arm interlocks dead zone above and below, L represents grid-connected wave filter.
As shown in figure 4, the five phase photovoltaic DC-to-AC converters 100 of the present invention further include SPWM modules 60 and PMU modules 70, SPWM moulds
Block 60 passes through the 10 IGBT switching tubes S with five phase inverter bridges 30 respectively of control line 611~S10Connection, so as to pass through SPWM modules
60 can control IGBT pipes S1~S10Conducting and disconnection, PMU modules 70 are connected by signal wire 71 with SPWM modules 60, so as to
It can send and instruct to SPWM modules 60.
SPWM modules 60 and PMU modules 70 are all connected by conducting wire with power supply respectively, and arrow 62,63 represents signal respectively
Ripple and carrier wave, signal wave refer to the waveform intentionally got is scaled as modulated signal, the in the present invention modulation
Signal is sine wave, and carrier wave refers to receiving the signal of modulation.
During operation, PMU modules 70 send instructions to SPWM modules 60, and SPWM modules 60 control the IGBT pipes of five phase inverter bridges
Break-make, so as to obtain desired voltage signal.
When carrier signal reaches SPWM modules 60, which is reached PMU moulds by SPWM modules 60 by signal wire
Block 70, PMU modules 70 issue instructions to SPWM modules 60, and SPWM modules 60, which perform, calculates comparing function, and passes through control line traffic control
Make 10 IGBT pipe pipes S of five phase inverter bridges 301~S10Break-make, so as to obtain desired voltage signal.
In another embodiment of the invention, five phase photovoltaic DC-to-AC converters 100 further include direct current EMC wave filters, direct current EMC filters
Ripple device is arranged between dc circuit breaker 10 and DC/DC converters, input terminal and the dc circuit breaker 10 of direct current EMC wave filters
Output terminal is electrically connected, and the output terminal of direct current EMC wave filters is electrically connected with the input terminal of DC/DC converters, and direct current EMC wave filters are real
Now filter out the effect of electromagnetism harmonic wave.
In another embodiment of the invention, five phase photovoltaic DC-to-AC converters 100 further include exchange EMC wave filters, exchange EMC filters
Ripple device is arranged between five phase filters 40 and AC circuit breaker 50, exchanges the input terminal and five phase filters 40 of EMC wave filters
Output terminal electrical connection, exchange EMC wave filters output terminal be electrically connected with the input terminal of AC circuit breaker 50, exchange EMC filter
Device realizes the effect for filtering out electromagnetism harmonic wave.
The five phase photovoltaic DC-to-AC converter topological structures of the present invention are simple, have the advantages that limit from amount of capacity.But it controls
Mode processed is also relative complex, introduces the control method of five phase photovoltaic DC-to-AC converters of the invention in detail below.
If the switch function of five phase photovoltaic DC-to-AC converters is
S=[Sa, Sb, Sc, Sd, Se] (1)
If Sa=1, then it represents that photovoltaic DC-to-AC converter a phase bridge arms upper switch turns on, and lower switch shut-off, output point is in power supply
The voltage (pole tension) of heart point O is Ud/2；
If Sa=0, then a phases bridge arm upper switch shut-off, lower switch conducting, output pole tension is-Ud/ 2, other each switches
Function is same.
At this point, polyphase inverter output pole tension is expressed as with switch function
uk0=SmUd-Ud/2 (2)
Five phase photovoltaic DC-to-AC converter output line voltages can be expressed as
Five phase photovoltaic DC-to-AC converters output phase voltage can be expressed as
Therefore, space vector of voltage equation is
Formula (4) is brought into formula (5) to obtain,
According to above-mentioned definition, 32 different voltage vectors can be obtained by calculating.Large, medium and small each 10 of vector,
In addition there are 2 zero vectors, space voltage vector figure is as shown in Figure 5.Space is divided into 10 sectors by they.Wherein, big or middle vector
Shown in amplitude expression such as formula (7) formula (8).
5 binary systems in figure corresponding to each voltage vector are the switch functions of the vector.Wherein, large, medium and small 3 kinds
Effective vector of amplitude corresponds to the different working condition of five phase photovoltaic DC-to-AC converters, i.e. 1/4 working method, 2/3 working method respectively
With pseudo- 2/3 working method.So-called 2/3 working method refers to that at a time bridge arm has two to be conducted on photovoltaic DC-to-AC converter, lower bridge
Arm has three to be conducted or vice versa, and upper bridge arm (or lower bridge arm) conducting is mutually adjacent, and the voltage vector that can cause synthesis is maximum.
1/4 working method is similar therewith.Pseudo- 2/3 working method is due to bridge arm (or lower bridge arm) simultaneously turns on thereon three-phase not all phase
There is the phase being not turned on, to prevent from causing the Excitation interference between phase and phase, therefore should avoid using in neighbour, centre.
The present invention is using 2/3 working method and 1/4 working method Comprehensive Control, so that the waveform of output is more flat
Surely.Under this control method, using one big vector, two middle one zero vectors of vector sum to the reference voltage in sector into
Row synthesis.
It is illustrated below by taking first sector as an example, selects UM1(10000)、UL2(11000)、UM3(01000) and
U0(00000) vector is to reference voltage UrefIt is synthesized.Sequence of operation in the first sector is UM1(10000)→UL2
(11000)→UM3(01000)→U0(00000)→UM3(01000)→UL2(11000)→UM1(10000)。
It is located at a switch periods TsThe action time of interior k-th of vector is Tk, then the vector balancing equation in each sector
For：
According to formula (9), time variable T can be obtainedL(k+1)、T(M+2)k、TMkAnd T0Value, wherein, the PWM wave under which
Shape is shown in Fig. 6.
By above analysis, the control method of five phase photovoltaic DC-to-AC converter of the present invention of the invention is mainly including following
Step：
(1) switching equation of five phase photovoltaic DC-to-AC converters is established：S=[Sa, Sb, Sc, Sd, Se], wherein, Sm=1 represents photovoltaic
Inverter a phase bridge arms upper switch turns on, lower switch shut-off；Sm=0 represents upper switch shut-off, lower switch conducting, m=a, b, c, d
Or e；
(2) the pole tension equation of five phase photovoltaic DC-to-AC converters is established：uk0=SmUd-Ud/2；
(3) the voltage vector equation of five phase photovoltaic DC-to-AC converters is established：
(4) 32 voltage vectors of five phase photovoltaic DC-to-AC converters are obtained.
As shown in figure 5,32 voltage vectors include big vector ULi, i be >=1 and≤10 integer, middle vector UMj, j is
>=1 and≤10 integer, small vector USn(not shown), n are >=1 and≤10 integer and two zero vector U0, wherein this 32
A voltage vector is scattered in 10 sectors, each sector includes two big vector, two middle vectors, (figure is not for two small vectors
Show) and a zero vector；
(5) synthesized reference voltage Uref：If reference voltage UrefPositioned at k-th of sector, U is selectedL(k+1)、UMk、UM(k+2)And
One zero vector U0Carry out synthesized reference voltage Uref；
(6) voltage U is obtainedL(k+1)、UMk、UM(k+2)And U0Action time：
It is located at a switch periods TsThe action time of interior k-th of vector is Tk, establish vector balancing side in k-th of sector
Journey：
So as to which T be obtainedL(k+1)、T(M+2)k、TMkAnd T0。
The five phase photovoltaic DC-to-AC converters of the present invention have the following advantages：
(1) five phase control system is bigger than the modulation index of conventional three-phase system, therefore the linear tune of five phase photovoltaic DC-to-AC converters
Scope bigger processed, DC power supply utilization rate higher；
Harmonic component in (2) five phase photovoltaic DC-to-AC converter output voltages and electric current reduces；
(3) when the phase in five phases or a few phases break down, by appropriate control, photovoltaic DC-to-AC converter still can be by work(
Rate is started and run, and system reliability is high；
(4) transformation efficiency and grid connection capacity of photovoltaic DC-to-AC converter are improved to greatest extent, while output waveform is more flat
Surely.
Presently preferred embodiments of the present invention is described in detail above, it is understood that being said having read the above-mentioned of the present invention
After awarding content, those skilled in the art can make various modifications or changes to the present invention.Such equivalent forms equally fall within this
Apply for the appended claims limited range.
Claims (8)
- A kind of 1. pre-assembled substation room of five phase photovoltaic DC-to-AC converters, which is characterized in that the pre-assembled substation of five phases photovoltaic DC-to-AC converter Room includes five phase photovoltaic DC-to-AC converters, transformer, inverter room and transformer room, whereinThe photovoltaic DC-to-AC converter is arranged in the inverter room, and the transformer is arranged in the transformer room, Yi Jisuo It states and is connected between inverter room and the transformer room by copper bar；AndThe five phases photovoltaic DC-to-AC converter includes dc circuit breaker, DC/DC converters, five phase inverter bridges, five phase filters and friendship Breaker is flowed, wherein, the output terminal of the dc circuit breaker is electrically connected with the input terminal of the DC/DC converters, the DC/DC The output terminal of converter is electrically connected with the input terminal of the five phases inverter bridge, the output terminal of the five phases inverter bridge and five phase Wave filter is electrically connected and five phase filter is electrically connected with the AC circuit breaker, whereinThe five phases photovoltaic DC-to-AC converter further includes SPWM modules and PMU modules, wherein the SPWM modules pass through control line and institute Five phase inversion bridgings to be stated to connect, the PMU modules are connected by signal wire with the SPWM modules, during operation, the PMU modules hair Sending instruction, the SPWM modules control the IGBT pipe break-makes of five phase inverter bridges, so as to obtain desired electricity to the SPWM modules Press signal andThe SPWM modules are equipped with the circuit for performing procedure below：(1) switching equation of five phase photovoltaic DC-to-AC converters is established：S=[Sa, Sb, Sc, Sd, Se], wherein, Sm=1 represents photovoltaic inversion The conducting of device m phase bridge arms upper switch, lower switch shut-off, Sm=0 represents upper switch shut-off, wherein lower switch conducting, m=a, b, c, d, Or e；(2) the pole tension equation of five phase photovoltaic DC-to-AC converters is established：uk0=SmUd-Ud/ 2, wherein UdRepresent the straight of inverter bridge input terminal Flow side voltage；(3) the voltage vector equation of five phase photovoltaic DC-to-AC converters is established：(4) 32 voltage vectors of five phase photovoltaic DC-to-AC converters are obtained, which includes big vector ULi, i for >=1 and≤ 10 integer, middle vector UMj, j be >=1 and≤10 integer, small vector USn, n is >=1 and≤10 integer and two zero Vector U0, wherein 32 voltage vectors are scattered in 10 sectors, each sector include two big vector, two middle vectors, Two small vectors and a zero vector；(5) synthesized reference voltage Uref：If reference voltage UrefPositioned at k-th of sector, U is selectedL(k+1)、UMk、UM(k+2)And one Zero vector carrys out synthesized reference voltage Uref；(6) voltage U is obtainedL(k+1)、UMk、UM(k+2)And U0Action time.
- 2. the pre-assembled substation room of five phases photovoltaic DC-to-AC converter according to claim 1, which is characterized in that the five phases photovoltaic is inverse Becoming utensil has 1/4 working method and 2/3 working method；Wherein1/4 working method refers to that at a time the upper bridge arm of the five phases inverter bridge has one to be conducted, and lower bridge arm has four It is conducted or the upper bridge arm of the five phases inverter bridge has four to be conducted, lower bridge arm has one to be conducted；And2/3 working method refers to that at a time the upper bridge arm of the five phases inverter bridge has two to be conducted, and lower bridge arm has three It is conducted or the upper bridge arm of the five phases inverter bridge has three to be conducted, lower bridge arm has two to be conducted.
- 3. the pre-assembled substation room of five phases photovoltaic DC-to-AC converter according to claim 2, which is characterized in that in described 1/4 work In mode and 2/3 working method, the mutually adjacent and lower bridge arm conducting of upper bridge arm conducting it is mutually adjacent.
- 4. the pre-assembled substation room of five phases photovoltaic DC-to-AC converter according to claim 1, which is characterized in that the five phases photovoltaic is inverse Become device and further include direct current EMC wave filters, the direct current EMC wave filters are arranged on the dc circuit breaker and are converted with the DC/DC Between device, wherein the input terminal of the direct current EMC wave filters is electrically connected and described straight with the output terminal of the dc circuit breaker The output terminal of stream EMC wave filters is electrically connected with the input terminal of the DC/DC converters.
- 5. the pre-assembled substation room of five phases photovoltaic DC-to-AC converter according to claim 1, which is characterized in that the five phases photovoltaic is inverse Become device and further include exchange EMC wave filters, the exchange EMC wave filters are arranged at five phase filter and the AC circuit breaker Between, wherein the input terminal of the exchange EMC wave filters is electrically connected with the output terminal of five phase filter and the exchange The output terminal of EMC wave filters is electrically connected with the input terminal of the AC circuit breaker.
- 6. a kind of control method in the pre-assembled substation room of five phases photovoltaic DC-to-AC converter, the pre-assembled substation room of five phases photovoltaic DC-to-AC converter Including five phase photovoltaic DC-to-AC converters, transformer, inverter room and transformer room, whereinThe photovoltaic DC-to-AC converter is arranged in the inverter room, and the transformer is arranged in the transformer room, Yi Jisuo It states and is connected between inverter room and the transformer room by copper bar；AndThe five phases photovoltaic DC-to-AC converter includes dc circuit breaker, DC/DC converters, five phase inverter bridges, five phase filters and friendship Breaker is flowed, wherein, the output terminal of the dc circuit breaker is electrically connected with the input terminal of the DC/DC converters, the DC/DC The output terminal of converter is electrically connected with the input terminal of the five phases inverter bridge, the output terminal of the five phases inverter bridge and five phase Wave filter is electrically connected and five phase filter is electrically connected with the AC circuit breaker, which is characterized in that the described method includes Following steps：(1) switching equation of five phase photovoltaic DC-to-AC converters is established：S=[Sa, Sb, Sc, Sd, Se], wherein, Sm=1 represents photovoltaic inversion Device m phase bridge arms upper switch turns on, lower switch shut-off；Sm=0 represents upper switch shut-off, lower switch conducting, m=a, b, c, d or e；(2) the pole tension equation of five phase photovoltaic DC-to-AC converters is established：uk0=SmUd-Ud/ 2, wherein UdRepresent the straight of inverter bridge input terminal Flow side voltage；(3) the voltage vector equation of five phase photovoltaic DC-to-AC converters is established：(4) 32 voltage vectors of five phase photovoltaic DC-to-AC converters are obtained, which includes big vector ULi, i for >=1 and≤ 10 integer, middle vector UMj, j be >=1 and≤10 integer, small vector USn, n is >=1 and≤10 integer and two zero Vector U0, wherein 32 voltage vectors are scattered in 10 sectors, each sector include two big vector, two middle vectors, Two small vectors and a zero vector；(5) synthesized reference voltage Uref：If reference voltage UrefPositioned at k-th of sector, U is selectedL(k+1)、UMk、UM(k+2)And one Zero vector U0Carry out synthesized reference voltage Uref；(6) voltage U is obtainedL(k+1)、UMk、UM(k+2)And U0Action time.
- 7. control method according to claim 6, which is characterized in that voltage U is obtained by following stepsL(k+1)、UMk、 UM(k+2)And U0Action time：It is located at a switch periods TsThe action time of interior k-th of vector is Tk, establish vector balancing equation in k-th of sector：<mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>T</mi> <mi>s</mi> </msub> <msub> <mi>U</mi> <mrow> <mi>r</mi> <mi>e</mi> <mi>f</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>T</mi> <mrow> <mi>L</mi> <mrow> <mo>(</mo> <mi>k</mi> <mo>+</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow> </msub> <msub> <mi>U</mi> <mrow> <mi>L</mi> <mrow> <mo>(</mo> <mi>k</mi> <mo>+</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow> </msub> <mo>+</mo> <msub> <mi>T</mi> <mrow> <mi>M</mi> <mi>k</mi> </mrow> </msub> <msub> <mi>U</mi> <mrow> <mi>M</mi> <mi>K</mi> </mrow> </msub> <mo>+</mo> <msub> <mi>T</mi> <mrow> <mi>M</mi> <mrow> <mo>(</mo> <mi>k</mi> <mo>+</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow> </msub> <msub> <mi>U</mi> <mrow> <mi>M</mi> <mrow> <mo>(</mo> <mi>K</mi> <mo>+</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>T</mi> <mi>s</mi> </msub> <mo>=</mo> <msub> <mi>T</mi> <mrow> <mi>L</mi> <mrow> <mo>(</mo> <mi>k</mi> <mo>+</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow> </msub> <mo>+</mo> <msub> <mi>T</mi> <mrow> <mi>M</mi> <mi>k</mi> </mrow> </msub> <mo>+</mo> <msub> <mi>T</mi> <mrow> <mi>M</mi> <mrow> <mo>(</mo> <mi>k</mi> <mo>+</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow> </msub> <mo>+</mo> <msub> <mi>T</mi> <mn>0</mn> </msub> </mrow> </mtd> </mtr> </mtable> </mfenced>So as to which T be obtainedL(k+1)、T(M+2)k、TMkAnd T0。
- 8. control method according to claim 7, which is characterized in that voltage UL(k+1)、UMk、UM(k+2)And U0Effect it is suitable Sequence is：UMk→UL(k+1)→UM(k+2)→U0→UM(k+2)→UL(k+1)→UMk。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610169822.1A CN105576706B (en) | 2016-03-23 | 2016-03-23 | The pre-assembled substation room of five phase photovoltaic DC-to-AC converters and its control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610169822.1A CN105576706B (en) | 2016-03-23 | 2016-03-23 | The pre-assembled substation room of five phase photovoltaic DC-to-AC converters and its control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105576706A CN105576706A (en) | 2016-05-11 |
| CN105576706B true CN105576706B (en) | 2018-05-22 |
Family
ID=55886539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610169822.1A Active CN105576706B (en) | 2016-03-23 | 2016-03-23 | The pre-assembled substation room of five phase photovoltaic DC-to-AC converters and its control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105576706B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103715973A (en) * | 2014-01-03 | 2014-04-09 | 天津大学 | Space voltage vector pulse width modulation algorithm of five-phase voltage source inverter bridge |
| CN104038096A (en) * | 2014-04-03 | 2014-09-10 | 天津大学 | Novel space vector pulse width modulation method of five-phase inverter |
| CN104901525A (en) * | 2015-06-30 | 2015-09-09 | 中国电力工程顾问集团华东电力设计院有限公司 | Soft-start pre-assembly substation room |
| CN104901212A (en) * | 2015-06-30 | 2015-09-09 | 中国电力工程顾问集团华东电力设计院有限公司 | Voltage-reduction synchronization pre-assembly substation room |
| CN105262435A (en) * | 2015-09-02 | 2016-01-20 | 中国电力工程顾问集团华东电力设计院有限公司 | Pre-assembled substation room of photovoltaic power station |
| CN205429763U (en) * | 2016-03-23 | 2016-08-03 | 中国电力工程顾问集团华东电力设计院有限公司 | Five looks photovoltaic inverter pre -assembling substation rooms |
-
2016
- 2016-03-23 CN CN201610169822.1A patent/CN105576706B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103715973A (en) * | 2014-01-03 | 2014-04-09 | 天津大学 | Space voltage vector pulse width modulation algorithm of five-phase voltage source inverter bridge |
| CN104038096A (en) * | 2014-04-03 | 2014-09-10 | 天津大学 | Novel space vector pulse width modulation method of five-phase inverter |
| CN104901525A (en) * | 2015-06-30 | 2015-09-09 | 中国电力工程顾问集团华东电力设计院有限公司 | Soft-start pre-assembly substation room |
| CN104901212A (en) * | 2015-06-30 | 2015-09-09 | 中国电力工程顾问集团华东电力设计院有限公司 | Voltage-reduction synchronization pre-assembly substation room |
| CN105262435A (en) * | 2015-09-02 | 2016-01-20 | 中国电力工程顾问集团华东电力设计院有限公司 | Pre-assembled substation room of photovoltaic power station |
| CN205429763U (en) * | 2016-03-23 | 2016-08-03 | 中国电力工程顾问集团华东电力设计院有限公司 | Five looks photovoltaic inverter pre -assembling substation rooms |
Non-Patent Citations (2)
| Title |
|---|
| 五相逆变器的空间矢量PWM 控制;于飞等;《中国电机工程学报》;20050531;第25卷(第9期);40-46页 * |
| 高性能五相逆变器PWM算法研究;宋庆国等;《电力电子技术》;20071130;第41卷(第11期);106-109页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105576706A (en) | 2016-05-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102630369B (en) | Power conversion device | |
| CN105450059B (en) | Inhibit the modulator approach of two H bridge cascaded inverter leakage currents | |
| CN106374830B (en) | High-power high step-up ratio photovoltaic DC converter device and control method | |
| CN104467005A (en) | T-type three-level three-phase four-bridge-arm grid-connected photovoltaic power generation system and control method thereof | |
| CN106300414B (en) | A kind of modularization subway energy back feed device based on series and parallel structure | |
| CN104852583A (en) | High-frequency link multi-level direct-current transformer used for middle- low-voltage direct current distribution | |
| Yusof et al. | A comparative study of 5-level and 7-level multilevel inverter connected to the grid | |
| CN101567567A (en) | Carrier shifting inversion large power photovoltaic grid-connection system and control method thereof | |
| Rajan et al. | Comparative study of multicarrier pwm techniques for a modular multilevel inverter | |
| CN103326606A (en) | One-phase five-level inverter | |
| CN104638971A (en) | Photovoltaic grid-connected inverter and control method thereof | |
| Islam et al. | Design and comparison of 11 kV multilevel voltage source converters for local grid based renewable energy systems | |
| Vinayaka et al. | Modeling and design of five level cascaded h-bridge multilevel inverter with DC/DC boost converter | |
| CN203674732U (en) | T-type three-level three-phase four-leg photovoltaic gird-connected power generation system | |
| EP3157120B1 (en) | Modular multi-level flexible direct-current topology circuit suitable for fault ride-through | |
| Nathan et al. | The 27-level multilevel inverter for solar PV applications | |
| CN105429472B (en) | A kind of star-angle type rectifier type high power DC booster converter and its control method | |
| Yadav et al. | A hardware-in-loop platform for three-phase grid-tied pv array fed multilevel converter | |
| CN205429763U (en) | Five looks photovoltaic inverter pre -assembling substation rooms | |
| CN105576706B (en) | The pre-assembled substation room of five phase photovoltaic DC-to-AC converters and its control method | |
| CN105553275B (en) | Six phase contravariant high power DC booster converters of one kind and its control method | |
| CN205430086U (en) | Five looks photovoltaic inverter | |
| CN205681327U (en) | Multiphase photovoltaic DC-to-AC converter | |
| CN105610344A (en) | Multiphase photovoltaic inverter and control method thereof | |
| CN111049411B (en) | Modulation method of three-phase four-leg current source type converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |