CN106451536A - Integrated system of virtual synchronous machine and control method thereof - Google Patents
Integrated system of virtual synchronous machine and control method thereof Download PDFInfo
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- CN106451536A CN106451536A CN201610874794.3A CN201610874794A CN106451536A CN 106451536 A CN106451536 A CN 106451536A CN 201610874794 A CN201610874794 A CN 201610874794A CN 106451536 A CN106451536 A CN 106451536A
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- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention provides an integrated system of a virtual synchronous machine and a control method thereof. The system comprises an energy storage device, a DC/DC segment and a DC/AC segment which are connected in sequence, wherein a filter inductor and a filter capacitor are arranged between the energy storage device and the DC/DC segment; and two capacitors are arranged between the DC/DC segment and the DC/AC segment. The control method of the system comprises the following steps: starting the system, and controlling the DC/DC segment; starting the DC/DC segment, and carrying out a virtual synchronization algorithm; and starting a grid-connected command. Through the technical scheme provided by the invention, the space utilization rate of the virtual synchronous machine is improved, the cost is reduced, and the system is beneficial for implementation and environmental protection.
Description
Technical field
The present invention relates to a kind of virtual synchronous machine system, specifically relate to a kind of integral system and control method thereof of virtual synchronous machine.
Background technology
In recent years, due to factors such as the energy, environment, technology, renewable energy source domain is paid close attention to widely and is developed. with The especially rapid growth of photovoltaic generation and wind-power electricity generation installed capacity of renewable energy power generation, more and more distribute Formula power supply is incorporated to large electrical network, and their great potential aspect environmental protection, Energy restructuring, technical development are day by day obvious. Distributed power generation has multiple advantage: (1) environmental protection low-carbon (LC), can reduce the dependence to fossil energy; (2) power supply reliability can be improved And power supply quality; (3) cost-saving; (4) can improve transmission line of electricity utilization rate. but, the distributed power generation of high permeability can be right Bulk power grid produces impact and affects, and this brings new challenge for the safe and stable operation of power system.
Because synchronous generator can be realized management and running, load power is distributed, the several functions such as frequency modulation and voltage modulation, and its The features such as itself there is self-balancing ability, big perception output impedance, droop characteristic, if large rotating inertia. microgrid inverter energy The operation characteristic of synchronous generator is enough simulated, then it just can generally a safe support the normal of bulk power grid such as step generator Operation, this generates virtual synchronous generator concept, but predominantly stays in theoretical simulation research at present, particularly by virtuality synchronous generator is split as the research of synchronous inverter and two-way DC converter, finally again two device hardwares are connected come, caused utilization rate of equipment and installations not high, equipment connection disturbs large, jointly control and disturb the defects such as large by communication.
For this reason, in the urgent need to a kind of integral system and control method thereof of virtual synchronous machine, overcome utilization rate of equipment and installations low, equipment connection disturbs the problems such as large.
Summary of the invention
In order to solve existing above-mentioned deficiency in prior art, the invention provides a kind of integrated System of being and its control method. of virtual synchronous machine
Technical scheme provided by the invention is: a kind of integral system of virtual synchronous machine, described system comprises: connect successively The energy storage device, DC/DC link and the DC/AC link that connect;
Between described energy storage device and described DC/DC link, filter inductance and filter capacitor are set, two electric capacity are set between described DC/DC link and DC/AC link.
Described DC/DC link comprises: brachium pontis and capacitor C 2 that energy storage inductor L2, IGBT form;
The bridge arm includes bridge arm IGBT and lower bridge arm IGBT；
The colelctor electrode of the transmitting collection and the lower bridge arm IGBT of the upper bridge arm IGBT is connected with described energy storage inductor L2 one end
Connect, the other end of the upper bridge arm IGBT and lower bridge arm IGBT is connected with the two ends of the electric capacity C2 respectively.
Preferably, the bridge arm mode of operation that the IGBT is constituted adopts half-bridge mode.
Preferably, the DC/AC links adopt three-phase four-arm band centerline construction, and arrange LCL filter in output end；
The three-phase four-arm band centerline construction includes：Bridge arm includes that the IGBT and electric capacity of two series connection is arranged in parallel,
Center line connection LCL filter is drawn between two IGBT.
Preferably, the LCL filter includes:Filter inductance, filter capacitor and the filter inductance being sequentially connected.
Preferably, the modulation system of described DC/AC link adopts 3DSVPWM technology.
A kind of control method of the integral system of virtual synchronous machine includes：
(1) activation system, controls DC/DC links；
(2) start DC/AC links, introduce virtual synchronous algorithm；
(3) start grid-connected instruction, complete grid-connected.
Preferably, the control DC/DC links of step (1) include：Adjusted using the double-closed-loop control of electric voltage feed forward
Voltage processed, modulation voltage are compared the driving pulse for generating boosting pipe, the driving pulse of decompression tube and boosting with triangular carrier
The driving pulse of pipe is negated, then is half-bridge mode by the bridge arm mode of operation of the DC/DC links, realizes busbar voltage voltage stabilizing.
Preferably, the virtual synchronous algorithm of step (2) includes: when net side is led because load increases/reduces When causing the frequency of net pressure to decline/rise, corresponding active power is exported/absorbs to net side, when net side is led due to load characteristic When causing the amplitude of net pressure to decline/rise, corresponding reactive power is exported/absorbs to net side;
The DC/AC links include：The driving pulse that 8 IGBT of three-phase four-arm are generated using 3DSVPWM modulation techniques.
Preferably, the condition of the grid-connected instruction of startup of described step (3) comprising: Inverter output fundamental voltage amplitude with Voltage on line side amplitude is consistent, and phase place is delayed compared with net side/super previous low-angle, delayed after each cycle/advanced angle Degree can add up, 360 ° of and when delayed/leading angle is added to, starts grid-connected instruction, complete grid-connected.
Compared with immediate prior art, the present invention has following excellent effect：
1st, DC/DC link of the present invention comprising virtual synchronous machine and DC/AC links integral system and its control method, carry
High space availability ratio is high, reduces cost, and beneficial to control, by once.
2, the present invention has abandoned traditional SPWM modulation system in the modulation of three-phase four-arm, uses 3DSVPWM modulation Mode so that voltage utilization is higher instead, is lost less.
3rd, the boost and buck multiplexing one of the Boost-Buck bridge arms that DC/DC links of the invention are made up of two IGBT
Individual module, the synchronous inversion of DC/AC links and synchronous rectification are multiplexed a module, and simple structure, utilization rate of equipment and installations are high, cost
Low.
4th, the switching device of DC/DC links of the present invention and DC/AC links adopts IGBT, can realize the bi-directional of energy.
Description of the drawings
Fig. 1 is the integral system schematic diagram of virtual synchronous machine of the present invention;
Fig. 2 is the DC/DC double-closed-loop control schematic diagrames based on electric voltage feed forward of the present invention；
Fig. 3 is the 3DSVPWM switch state vector figures of the present invention；
Fig. 4 is the DC/AC cutting-in control schematic diagrames based on virtual synchronous algorithm of the present invention.
Specific embodiment
For a better understanding of the present invention, present disclosure is done further with reference to Figure of description and example
Explanation.
The present invention provides a kind of integral system of virtual synchronous machine and its control method, as shown in figure 1, with " boosting-with
As a example by the energy transmission direction of step inversion ", the output of DC/DC links is connected with the input of DC/AC links, two electricity of junction
Hold C3 and C4 and constitute DC support electric capacity.Filter inductance L1 and filter capacitor C1 is devised between energy storage device and DC/DC links,
Ensure quality during Two-way energy transfer.
DC/DC links include energy storage inductor L2, the Boost-Buck bridge arms of two IGBT compositions and peak absorbing electric capacity C2.
The main components parameter of two-way DC/DC links is as follows：Energy storage inductor L2 is 2.4mH/20A；Two IGBT devices G1 and G2 are
600V/50A；Peak absorbing electric capacity C2 is 0.47uf/1200V.
DC/DC links are boost-buck converters, are made up of two IGBT, drive arteries and veins using half-bridge mode control
Punching, realizes that same set of PI adjusts actively switching and adjusts boost and buck.On microcosmic, work in each switch periods is existing
Boost mode phases, also work in buck mode phases.Macroscopically, energy flow when DC/DC links work in boost patterns
Direction is：DC/DC links → DC/AC links；When DC/DC links work in buck patterns, the flow direction of energy is：DC/AC
Link → DC/DC links, therefore boost-buck converters can realize the two-way flow of energy.DC/DC links adopt voltage
The two close cycles voltage stabilizing control algolithm of feedforward.
DC/AC links are synchronous inversion-rectifiers, DC/AC links using three-phase four-arm band centerline construction, each
Bridge arm is made up of two IGBT, the subsidiary peak absorbing electric capacity of each bridge arm, has LCL filter in the output end of DC/AC links, defeated
The purpose for going out filter capacitor series damping resistor is to prevent resonance.DC/AC link main components parameters are as follows：8
IGBT is 600V/50A from Q1 to Q8, and peak absorbing electric capacity C5 to C8 is 1200V/0.47uF, and output inductor is 3mH/
19A, damping resistance are 0.5ohm, and output filter capacitor is 20uF/250V/1.3A.
DC/AC links improve the voltage utilization of synchronous inversion-commutating DC side using 3DSVPWM technology, reduce
The loss that the work of inversion-rectification module makes, reduces the aberration rate of inversion direction output voltage and electric current.DC/AC links
Control mode is using being combined based on virtual synchronous algorithm and 3DSVPWM modulation systems.
The bridge arm mode of operation that the IGBT of DC/DC links is constituted selects the driving pulse that half-bridge mode, i.e. algorithm are controlled to be
Boosting pipe (IGBT of bridge arm under DC/DC links) driving pulse, the driving pulse of decompression tube (IGBT of bridge arm in DC/DC links)
Automatically negate.
The principle that DC/DC links actively carry out Boost and Buck using same set of PI is as follows：As battery tension is floating
Dynamic, if battery tension is UC1, desired output voltage stabilizing is Uref, UrefIt is more than UC1, then algorithm control boosting pipe conducting duty
Than for (Uref-Uc1)/Uref, now decompression tube be 0 level shut-off, by boost chopper principle, DC/DC output voltage UdcFor Uc1/
(1-(Uref-Uc1)/Uref)=Uref；Due to adopting half-bridge mode, after the completion of boost phase, buck stage is immediately entered, due to
The dutycycle of boosting pipe is (Uref-Uc1)/Uref, so the boosting pipe shut-in time is 1- (U within the modulation periodref-Uc1)/
Uref, the boosting pipe shut-in time is the conducting dutycycle of decompression tube, obtains step-down direction voltage by buck chopper principle and is
(1-(Uref-Uc1)/Uref)*Uref=Uc1, equal to the real-time voltage of battery.
As the above analysis, although battery tension is change, but using after half-bridge mode, can realize one
In modulation period, same set of PI actively adjusts chopping mode in the Boost and Buck two for control DC/DC links.
Fig. 2 show the control block diagram of DC/DC links, due to the front voltage U of DC/DC linksC1Typically unstable, with straight
Stream bus expects voltage UrefAs control specified rate, with energy storage inductor L2In electric current iL2With peak absorbing electric capacity C2 two ends
Voltage UC2Respectively as the feedback quantity of inner ring and outer rings, two close cycles voltage stabilizing control is carried out, in order to reduce voltage and current mutation, drawn
Band feed-forward coefficients k are enteredqElectric voltage feed forward double closed-loop control system, band feed-forward coefficients kqElectric voltage feed forward double closed-loop control system
It is the improvement of conventional double closed-loop control system, in order to suppress the PI for controlling to start Voltage loop when instant feedback voltage is 0
Adjuster exports excessive or even saturation, after adding feedback factor, current inner loop PI while outer voltage can be made to control rapidly
Adjuster output will not be mutated, and after busbar voltage is stable, meet Uref-Uc2=0, i.e. feedforward amount disappears automatically, can reduce from
The impact that stabilization process bus capacitor is rapidly risen is started to due to voltage.
UCIt is the modulation voltage of output duty cycle.There are two ranks in a PWM cycle in Boost and Buck processes
Section, from map analysis：The dutycycle of Boost (lower bridge arm) is Dboost=1- (UC1/Uref)；The dutycycle of Buck (upper bridge arm)
For Dbuck=UC1/Uref, two dutycycle sums are 100% (i.e. complementary).
The modulation system of DC/AC links is 3DSVPWM technology, in the DC/AC links three-phase four-arm shown in figure 1 above totally 8
In the synchronous inverter of individual IGBT, each IGBT is turned on and off, and has 16 kinds of on off states, wherein has two zero vectors,
I.e. standard-sized sheet leads to and fully closed two kinds of situations of breaking.According to three-dimensional coordinate of the every group of switching vector selector on alpha-beta-γ complex planes, can be by ten
Six groups of switching vector selectors are depicted in three dimensional space coordinate, as shown in Figure 3.Wherein P represents that pipe conducting down tube is closed on the bridge arm
Disconnected, N represents the upper pipe shut-off of the bridge arm down tube conducting, and PPPP and NNNN is zero vector.
Found out by Fig. 3, in addition to two zero vectors, remaining 14 non-zero space vectors constitutes six rib of space
Post.Its core control thought is：According to the movement locus V (V that loading condition determines blended space vectorα,Vβ,Vγ)；For any
The blended space vector V at moment, can determine three adjacent with V switching vector selector (d in 14 non-zero space vectors1,
d2,d3) being fitted, according to space combination principle, the dutycycle (d for the switching vector selector being fitted can be obtained1,d2,d3) calculate public affairs
Formula (1) and dutycycle d of center line switching vector selector0Computing formula (2).
d0=1-d1-d2-d3(2)
Fig. 4 show DC/AC link virtual controlling algorithm block diagrams.Mainly realize that net buckling tackled by grid-connected rear virtual synchronous machine
The active self-regulating function of change：When net side causes the frequency for netting pressure due to load increase (or reduction)When declining (or rising),
As sagging mechanism virtual synchronous machine runs on inversion (or rectification) direction, to the corresponding active-power P of net side output (absorption),
When net side causes amplitude Vm for netting pressure to decline (or rising) due to load characteristic, as sagging mechanism virtual synchronous machine runs
In inversion (or rectification) direction, to the corresponding reactive power Q of net side output (or absorption).Wherein,For given frequency, typically take
The rated frequency of virtual synchronous machine design,For virtual synchronous machine real-time frequency, DpFor frequency droop coefficient,For frequency integrator
Coefficient, characterizes the constant of integrating rate, vfbFor net side three-phase feedback voltage, vmFor voltage on line side amplitude, vrFor giving voltage amplitude
Value reference, typically takes the rated voltage amplitude of virtual synchronous machine design, DqFor the sagging coefficient of voltage,For magnetic linkage integral coefficient,
Characterize magnetic linkage integration speed, e for virtual synchronous machine electromotive force, i be grid-connected place's electric current, PsetAnd QsetIt is virtual synchronous machine peopleFor giving passive service output, mutually independent with sagging mechanism active power output, relates to Formula as follows in can achieve vector superposed. Fig. 3:
In formula (3) (4) (5), p is number of pole-pairs, takes 1, M at thisfifFor rotor flux, i0For grid-connected phase voltage amplitude,For real-time phase,For virtual synchronous machine real-time frequency,It is three-phase symmetrical matrix expression,
A kind of control method of the integral system of virtual synchronous machine, the control method include：
I, activation system, control DC/DC links：
After system starts, DC/DC links are controlled first, give DC bus-bar voltage desired value Uref, using electric voltage feed forward
Double-closed-loop control obtains modulation voltage Uc, modulation voltage and triangular carrier are compared the driving pulse for generating boosting pipe, step-down
The driving pulse of pipe is negated with the driving pulse of boosting pipe, by " DC/DC links actively carry out Boost using same set of PI above
Principle with Buck " understands that DC/DC links can realize the voltage stabilizing of busbar voltage.
II, startup DC/AC links, introduce virtual synchronous algorithm：
After DC bus-bar voltage is stable, start DC/AC links, introduce virtual synchronous algorithm, be now in pre- grid-connected (not
Grid-connected) stage, the modulation system of DC/AC links is using 3DSVPWM technology.From Fig. 4 and formula (4), virtual synchronous generate electricity
The electromotive force of machineAs the reference voltage of 3DSVPWM, start the startup moment rotor flux of DC/AC links
MfifInitial value gives rated value, frequencyGiven by pressure is netted with phase theta initial value.After entering 3DSVPWM modules, by abc/ α
β γ coordinate transforms obtain blended space vector V (Vα,Vβ,Vγ), three-phase four-arm 8 is generated through 3DSVPWM modulation techniques
The driving pulse of IGBT, makes synchronous inverter output follow the high-frequency pulse voltage that voltage on line side changes, the high-frequency impulse for obtaining
Voltage obtains the fundamental voltage of three-phase 50Hz after LCL filtering.
III, the grid-connected instruction of startup, complete grid-connected.
Start DC/AC initial times, the fundamental voltage amplitude of inverter output is consistent with voltage on line side amplitude, phase place and net
Delayed (or advanced) low-angle is compared in side, and the angle of delayed after each cycle (or advanced) can add up, when delayed (or
When in advance) angle is added to 360 °, starts grid-connected instruction, complete automatic detection grid-connected.
Complete grid-connected after, then virtual synchronous generator can follow the change of net pressure amplitude value or frequency to automatically adjust virtuality
Energy transmission is carried out between synchronous generator system power output or absorbed power, and electrical network, and principle is as shown in Figure 4；Whole control
Flow process processed realizes that in a controller control method is compact tight, by once, strong anti-interference performance.
Embodiments of the invention are these are only, the present invention is not limited to, all in the spirit and principles in the present invention
Within, any modification, equivalent substitution and improvements that is done etc., be all contained in applying pending scope of the presently claimed invention it
Interior.
Claims (10)
1. a kind of integral system of virtual synchronous machine, it is characterised in that the system includes：The energy storage device that is sequentially connected,
DC/DC links and DC/AC links；
Filter inductance and filter capacitor, the DC/DC links and DC/AC are set between the energy storage device and the DC/DC links
Two electric capacity are set between link.
2. the integral system of virtual synchronous machine as claimed in claim 1, it is characterised in that the DC/DC links include：Storage
Bridge arm and electric capacity C2 that energy inductance L2, IGBT are constituted；
The bridge arm includes bridge arm IGBT and lower bridge arm IGBT；
The colelctor electrode of the transmitting collection and the lower bridge arm IGBT of the upper bridge arm IGBT is connected with described energy storage inductor L2 one end, institute
The other end for stating bridge arm IGBT and lower bridge arm IGBT is connected with the two ends of the electric capacity C2 respectively.
3. the integral system of virtual synchronous machine as claimed in claim 2, it is characterised in that the bridge arm work that the IGBT is constituted
Operation mode adopts half-bridge mode.
4. the integral system of virtual synchronous machine as claimed in claim 1, it is characterised in that the DC/AC links adopt three
Phase four bridge legs band centerline construction, and LCL filter is set in output end；
The three-phase four-arm band centerline construction includes：Bridge arm includes that the IGBT and electric capacity of two series connection is arranged in parallel, at two
Center line connection LCL filter is drawn between IGBT.
5. the integral system of virtual synchronous machine as claimed in claim 4, it is characterised in that the LCL filter includes:According to
The filter inductance of secondary connection, filter capacitor and filter inductance.
6. the integral system of virtual synchronous machine as claimed in claim 4, it is characterised in that the modulation of the DC/AC links
Mode adopts 3DSVPWM technology.
7. a kind of control method of the integral system of virtual synchronous machine, the control method include：
(1) startup system, controls DC/DC link;
(2) start DC/AC link, introduce virtual synchronous algorithm;
(3) start grid-connected instruction, complete grid-connected.
8. control method as claimed in claim 7, it is characterized in that, the control DC/DC link of described step (1) comprising: adopt two closed-loop controls of electric voltage feed forward to obtain modulation voltage, modulation voltage and triangular carrier compare the driving pulse that generates boosting pipe, the driving pulse negate of the driving pulse of decompression tube and boosting pipe, be half-bridge mode by the brachium pontis mode of operation of described DC/DC link again, realize busbar voltage voltage stabilizing.
9. control method as claimed in claim 7, is characterized in that, the described virtual synchronous algorithm of described step (2) comprising: When net side causes the frequency of net pressure to decline/rise because load increases/reduces, meritorious accordingly to the output/absorption of net side Power, in the time that net side causes the amplitude of net pressure to decline/rise due to load characteristic, idle accordingly to the output/absorption of net side Power;
Described DC/AC link comprises: adopt 3DSVPWM modulation technique to generate the driving pulse of 8 IGBT of three-phase four-arm.
10. control method as claimed in claim 7, it is characterized in that, the condition of the grid-connected instruction of startup of described step (3) comprising: the fundamental voltage amplitude of inverter output is consistent with voltage on line side amplitude, lag behind compared with net side/super previous low-angle of phase place, after each cycle, hysteresis/leading angle all can add up, in the time that hysteresis/leading angle is added to 360 °, start grid-connected instruction, complete grid-connected.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107093954A (en) * | 2017-05-26 | 2017-08-25 | 电子科技大学 | The two-stage type three-phase four-arm inversion system and control strategy boosted with BOOST |
| CN107863786A (en) * | 2017-11-22 | 2018-03-30 | 太原理工大学 | Bidirectional power converter control method based on virtual synchronous motor |
| CN108258707A (en) * | 2017-12-16 | 2018-07-06 | 西安翌飞核能装备股份有限公司 | A kind of hanging energy storage inverter system of middle straightening with peak-frequency regulation and its control method |
| CN108418257A (en) * | 2018-04-23 | 2018-08-17 | 华北电力科学研究院有限责任公司 | Photovoltaic virtual synchronous machine light stores up control method for coordinating and device |
| CN109672207A (en) * | 2018-12-04 | 2019-04-23 | 国网江苏省电力有限公司电力科学研究院 | A kind of back-to-back system (CCC-0) control method and system based on virtual synchronous machine |
| CN110112769A (en) * | 2019-04-16 | 2019-08-09 | 西安理工大学 | Virtual synchronous machine exports feedback adaptive control method |
| US20220085740A1 (en) * | 2018-12-28 | 2022-03-17 | Vestas Wind Systems A/S | Wind turbine with virtual synchronous generator and dc link control |
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| CN108258707A (en) * | 2017-12-16 | 2018-07-06 | 西安翌飞核能装备股份有限公司 | A kind of hanging energy storage inverter system of middle straightening with peak-frequency regulation and its control method |
| CN108418257A (en) * | 2018-04-23 | 2018-08-17 | 华北电力科学研究院有限责任公司 | Photovoltaic virtual synchronous machine light stores up control method for coordinating and device |
| CN109672207A (en) * | 2018-12-04 | 2019-04-23 | 国网江苏省电力有限公司电力科学研究院 | A kind of back-to-back system (CCC-0) control method and system based on virtual synchronous machine |
| US20220085740A1 (en) * | 2018-12-28 | 2022-03-17 | Vestas Wind Systems A/S | Wind turbine with virtual synchronous generator and dc link control |
| US11962262B2 (en) * | 2018-12-28 | 2024-04-16 | Vestas Wind Systems A/S | Wind turbine with virtual synchronous generator and DC link control |
| CN110112769A (en) * | 2019-04-16 | 2019-08-09 | 西安理工大学 | Virtual synchronous machine exports feedback adaptive control method |
| CN110112769B (en) * | 2019-04-16 | 2023-03-31 | 西安理工大学 | Output feedback self-adaptive control method for virtual synchronous machine |
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