CN104104114B - A kind of control method and system for solving grid-connected dash current - Google Patents
A kind of control method and system for solving grid-connected dash current Download PDFInfo
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- CN104104114B CN104104114B CN201410374955.3A CN201410374955A CN104104114B CN 104104114 B CN104104114 B CN 104104114B CN 201410374955 A CN201410374955 A CN 201410374955A CN 104104114 B CN104104114 B CN 104104114B
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Abstract
The invention discloses a kind of control method and system for solving grid-connected dash current, by synchronized locked phase angle because sampling and cake resistancet come delay compensate, it is ensured that the synchronization of phase；It is simultaneously that synchronized after target control reference value and compensation is locked phase angle and carries out contravariant vector control by the real-time decomposition value of two voltage active reactive components, obtains inverter voltage control vector, realizes that open loop is delayed and open, it is ensured that the synchronization of amplitude and frequency；In addition, judging with the difference of grid line voltage by inversion line voltage, value stabilization is on duty in smaller range, control the closure of simultaneously network relay, it is ensured that even if can also make closure moment impact current minimized in power network asymmetrical three-phase.This programme makes phase, amplitude and the frequency of inverter voltage and line voltage reach stringent synchronization, and grid-connected dash current is reduced into minimum, realizes the control of the dash current to combining inverter in grid-connected start-up course, is greatly reduced the appearance of dash current.
Description
Technical field
The present invention relates to grid-connected field, more particularly to a kind of control method and system for solving grid-connected dash current.
Background technology
Combining inverter during grid-connected, due to combining inverter and power network phase can not Complete Synchronization, simultaneously
The moment of net, because power network can be considered infinite bulk power grid, the electric current in power network can produce impact to the anti-power supply of inverter in moment
Electric current.
Therefore, when combining inverter carries out starting grid-connected, it is necessary to solve it is grid-connected during current impact.
The content of the invention
In view of this, the present invention provides a kind of control method and system for solving grid-connected dash current, to solve existing skill
In art it is grid-connected during current impact, its concrete scheme is as follows：
A kind of control method for solving grid-connected dash current, including：
To power network three-phase voltage real-time sampling and lock phase；
Control bus voltage soft reaches predetermined magnitude of voltage, and the predetermined magnitude of voltage is not controlled whole more than power network three-phase
Flow valuve；
The first coordinate transform is carried out to the power network three-phase voltage, and decomposition obtains two realities of voltage active reactive component
When decomposition value, the real-time decomposition value of described two voltage active reactive components is set as target control reference value；
Synchronized lock phase angle is compensated；
Synchronized after to target control reference value and compensation locks phase angle carries out the second conversion, obtains inverter voltage
Control vector；
Dutycycle is slow to be opened to control the inverter voltage vector to carry out, and pulse is reached the desired value of inverter voltage；
Inversion line voltage is compared with the real-time sampling value of grid line voltage, real-time sampling difference is obtained；
When the real-time sampling difference meets predetermined condition, the closure of simultaneously network relay is controlled.
Further, when the real-time sampling difference meets predetermined condition, the closure of simultaneously network relay, specific bag are controlled
Include：
When the real-time sampling difference meets predetermined condition, issue and network relay close command；
Described and network relay is closed；
Block open loop pulse, completes synchronous grid-connected.
Further, before described and network relay closure, also include：
Issue and after network relay close command, delay predetermined time.
Further, the predetermined condition is：The real-time sampling difference is less than preset range.
Further, it is described that synchronized lock phase angle is compensated specially：
The second conversion is carried out by locking phase angle to target control reference value and synchronized voltage, the second inverter voltage is obtained
Control vector；
Open ring pulse；
Inverter voltage in the ring pulse and power network three-phase voltage are compared, when the inverter voltage of the ring pulse
When there is phase difference with power network three-phase voltage, the compensation that synchronized locks phase angle is carried out.
Further, first coordinate is transformed to：Clark/park is converted；Described second is transformed to：Park inverse transformations.
A kind of control system for solving grid-connected dash current, including：Sampling unit, what is be connected with the sampling unit soft opens
Unit, with it is described it is soft open the voltage decomposition unit that unit is connected, compensating unit, with the voltage decomposition unit and compensating unit point
Not Xiang Lian converter unit, the open loop being connected with the converter unit is slow to open unit, delays with the open loop and opens the ratio that unit is connected
Compared with unit, the control unit being connected with the comparing unit, wherein：
The sampling unit is used for power network three-phase voltage real-time sampling and locks phase；
The soft unit that opens reaches predetermined magnitude of voltage for control bus voltage soft, and the predetermined magnitude of voltage is big
In power network three-phase uncontrollable rectifier value；
The voltage decomposition unit is used for carrying out the first coordinate transform to the power network three-phase voltage, and decomposition obtains two
The real-time decomposition value of individual voltage active reactive component, mesh is set as by the real-time decomposition value of described two voltage active reactive components
Mark control reference value；
The compensating unit is used to compensate synchronized lock phase angle；
The converter unit is used to carry out the second conversion to the synchronized lock phase angle after target control reference value and compensation,
Obtain inverter voltage control vector；
The open loop is slow to open unit dutycycle is slow to be opened for being carried out to inverter voltage control vector, reaches pulse inverse
The desired value of time variant voltage；
The comparing unit is used to be compared inversion line voltage with the real-time sampling value of grid line voltage, obtains in real time
Sampling difference；
Described control unit is used to when the real-time sampling difference meets predetermined condition, control and network relay is closed
Close.
Further, described control unit includes：The instruction issuance unit being connected with the comparing unit, with the instruction
The connected closed cell of issuance unit, the block unit being connected with the closed cell, wherein：
The instruction issuance unit is used to, when the real-time sampling difference meets predetermined condition, issue and network relay is closed
Close instruction；
The closed cell is used to control described and network relay to close；
The block unit is used to block open loop pulse, completes synchronous grid-connected.
Further, described control unit also includes：The time delay list being respectively connected with the closed cell and block unit
Unit, wherein：
The delay unit is used for after simultaneously network relay close command is issued, delay predetermined time.
Further, the compensating unit includes：Second converter unit, the unlatching list being connected with second converter unit
Unit, the genlock angle compensation unit being connected with the opening unit, wherein：
Second converter unit is used to carry out second by locking phase angle to target control reference value and synchronized voltage
Conversion, obtains the second inverter voltage control vector；
The opening unit is used to open ring pulse；
The genlock angle compensation unit is used to carry out the inverter voltage in the ring pulse and power network three-phase voltage
Compare, when the inverter voltage of the ring pulse has phase difference with power network three-phase voltage, carry out the benefit that synchronized locks phase angle
Repay.
From above-mentioned technical proposal as can be seen that the control method and system of the grid-connected dash current of solution disclosed in the present application,
By to synchronized lock phase angle because sampling and cake resistancet come delay compensate, it is ensured that the synchronization of phase；Pass through simultaneously
The real-time decomposition value of two voltage active reactive components is that the synchronized lock phase angle after target control reference value and compensation is carried out
Contravariant vector is controlled, and obtains inverter voltage control vector, is realized that open loop is slow and is opened, it is ensured that the synchronization of amplitude and frequency；In addition, logical
Cross and inversion line voltage is judged with the difference of grid line voltage, be on duty value stabilization in smaller range, control grid-connected relay
The closure of device, it is ensured that even if can also realize closing the minimum of moment impact electric current during power network asymmetrical three-phase.This programme passes through
Above-mentioned technological means makes phase, amplitude and the frequency of inverter voltage and line voltage reach stringent synchronization, by grid-connected dash current
Minimum is reduced to, the control of the dash current to combining inverter in grid-connected start-up course is realized, punching is greatly reduced
Hit the appearance of electric current.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of flow chart of the control method of grid-connected dash current disclosed in the embodiment of the present invention；
Fig. 2 is the flow chart of a kind of method of control and network relay closure disclosed in the embodiment of the present invention；
Fig. 3 is a kind of flow chart of the method compensated to synchronized lock phase angle disclosed in the embodiment of the present invention；
Fig. 4 is a kind of structural representation of the control system of grid-connected dash current disclosed in the embodiment of the present invention；
Fig. 5 is a kind of structural representation of control unit disclosed in the embodiment of the present invention；
Fig. 6 is a kind of structural representation of compensating unit disclosed in the embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
The invention discloses a kind of control method of grid-connected dash current, its flow chart as shown in figure 1, including：
Step S11, to power network three-phase voltage real-time sampling and lock phase；
Step S12, control bus voltage soft reach predetermined magnitude of voltage, and predetermined magnitude of voltage is more than power network three-phase not
Control rectified value；
Step S13, the first coordinate transform is carried out to power network three-phase voltage, and decomposition obtains two voltage active reactive components
Real-time decomposition value, the real-time decomposition value of two voltage active reactive components is set as target control reference value；
Wherein, the first coordinate transform is specially：Clark/park coordinate transforms, will three-phase alternating current amount be converted to two it is straight
Flow, from the two DC quantities, can be with each attribute of precise control three-phase alternating current.
Step S14, to synchronized lock phase angle compensate；
Phase angle is locked to synchronized because the delay that sampling and cake resistancet come is compensated, it is ensured that inverter voltage and power network three
The synchronization of phase voltage phase.
Step S15, the synchronized lock phase angle after to target control reference value and compensation carry out the second conversion, obtain
Inverter voltage controls vector；
Wherein, the second conversion is specially：Park inverse transformations.
Step S16, carry out that dutycycle is slow to be opened to inverter voltage control vector, pulse is reached the desired value of inverter voltage；
Synchronized after to target control reference value and compensation locks phase angle carries out the second conversion, and it is slow to carry out open loop
Open, it is ensured that inverter voltage and power network three-phase voltage amplitude and frequency it is synchronous.
Step S17, the real-time sampling value to inversion line voltage and grid line voltage are compared, and obtain real-time sampling poor
Value；
No matter whether inverter voltage is synchronous with power network three-phase voltage, the difference one between inversion line voltage and grid line voltage
It is fixed.
Step S18, when real-time sampling difference meets predetermined condition, control and network relay closure.
Wherein, predetermined condition is：Real-time sampling difference is less than preset range.I.e. when inversion line voltage and grid line voltage it
Between sampling difference be less than certain numerical value when, it is ensured that even if can also meet the condition of closure during power network asymmetrical three-phase, issue
And the close command of network relay, control and network relay closure.
The disclosed control method for solving grid-connected dash current of the present embodiment, by locking to synchronized phase angle because of sampling and
The delay that cake resistancet comes is compensated, it is ensured that the synchronization of phase；Simultaneously by two real-time point of voltage active reactive component
Solution value is that the synchronized lock phase angle after target control reference value and compensation carries out contravariant vector control, obtains inverter voltage control
Vector, realizes that open loop is slow and opens, it is ensured that the synchronization of amplitude and frequency；In addition, by inversion line voltage and grid line voltage
Difference judged, is on duty value stabilization in smaller range, control and network relay closure, it is ensured that even if power network three-phase is not right
Also can realize closing the minimum of moment impact electric current during title.This programme makes inverter voltage and power network electricity by above-mentioned technological means
The phase of pressure, amplitude and frequency reach stringent synchronization, and grid-connected dash current is reduced into minimum, realize and combining inverter is existed
The control of the dash current in grid-connected start-up course, is greatly reduced the appearance of dash current.In addition, disclosed in the present embodiment
The control method of grid-connected dash current, is applicable not only to situation during to power network asymmetrical three-phase, is also applied for power network three relative
The situation of title.
Present embodiment discloses one kind when real-time sampling difference meets predetermined condition, the side of simultaneously network relay closure is controlled
Method, its flow chart as shown in Fig. 2 including：
Step S21, when real-time sampling difference meets predetermined condition, issue and network relay close command；
Step S22 and network relay closure；
Step S23, block open loop pulse, complete synchronous grid-connected.
The disclosed control of the present embodiment and the method for network relay closure, by issuing simultaneously network relay close command, make
And network relay is closed, and block the open loop pulse completion grid-connected to realize synchronization.Ensure that and the effective of network relay closes
Close, furthermore achieved that the reduction of grid-connected dash current.
Further, the method for the disclosed control of the present embodiment and network relay closure, before step S23, can be with
Including：
Step S24, delay predetermined time.
After simultaneously network relay close command is issued, and network relay is closed, now delay predetermined time, it is ensured that relay
The reliable closure of device.
Present embodiment discloses a kind of method compensated to synchronized lock phase angle, its flow chart is as shown in figure 3, bag
Include：
Step S31, the second conversion is carried out by locking phase angle to target control reference value and synchronized voltage, obtain second
Inverter voltage controls vector；
Wherein, second park inverse transformations are transformed to.
Step S32, opening ring pulse；
Step S33, the inverter voltage in ring pulse and power network three-phase voltage are compared, when the inversion electricity in ring pulse
When pressure has phase difference with power network three-phase voltage, the compensation that synchronized locks phase angle is carried out.
The disclosed method compensated to synchronized lock phase angle of the present embodiment, by target control reference value and electricity
Net synchronizing voltage lock phase angle carries out park inverse transformations, obtains ring impulse waveform, and inverter voltage and power network three-phase are found out from waveform
Be present phase difference in voltage, now, synchronized lock phase angle is compensated so that between inverter voltage and power network three-phase voltage
Phase difference is 0, it is ensured that phase between inverter voltage and power network three-phase synchronous voltage it is synchronous.
Present embodiment discloses a kind of control system for solving grid-connected dash current, its structural representation as shown in figure 4, bag
Include：
Sampling unit 41, be connected with sampling unit 41 it is soft open unit 42, open the voltage decomposition list that unit 42 is connected with soft
Unit 43, compensating unit 44, the converter unit 45 being respectively connected with voltage decomposition unit 43 and compensating unit 44, with converter unit 45
Connected open loop is slow to open unit 46, delays with open loop and opens the comparing unit 47 that unit 46 is connected, the control being connected with comparing unit 47
Unit 48.
Sampling unit 41 is used for power network three-phase voltage real-time sampling and locks phase.
The soft unit 42 that opens reaches predetermined magnitude of voltage for control bus voltage soft, and predetermined magnitude of voltage is more than power network
Three-phase uncontrollable rectifier value.
Voltage decomposition unit 43 is used to carry out power network three-phase voltage the first coordinate transform, and decomposition obtains two voltages and has
The real-time decomposition value of work(reactive component, is set as that target control is referred to by the real-time decomposition value of two voltage active reactive components
Value.
Wherein, the first coordinate transform is specially：Clark/park coordinate transforms, will three-phase alternating current amount be converted to two it is straight
Flow, from the two DC quantities, can be with each attribute of precise control three-phase alternating current.
Compensating unit 44 is used to compensate synchronized lock phase angle.
Phase angle is locked to synchronized because the delay that sampling and cake resistancet come is compensated, it is ensured that inverter voltage and power network three
The synchronization of phase voltage phase.
Converter unit 45 is used to carry out the second conversion to the synchronized lock phase angle after target control reference value and compensation, obtains
Vector is controlled to inverter voltage.
Wherein, the second conversion is specially：Park inverse transformations.
Open loop is slow to open unit 46 dutycycle is slow to be opened for being carried out to inverter voltage control vector, pulse is reached inverter voltage
Desired value.
Synchronized after to target control reference value and compensation locks phase angle carries out the second conversion, and it is slow to carry out open loop
Open, it is ensured that inverter voltage and power network three-phase voltage amplitude and frequency it is synchronous.
Comparing unit 47 is used to be compared inversion line voltage with the real-time sampling value of grid line voltage, is adopted in real time
Sample difference.
No matter whether inverter voltage is synchronous with power network three-phase voltage, the difference one between inversion line voltage and grid line voltage
It is fixed.
Control unit 48 is used to be controlled when real-time sampling difference meets predetermined condition the closure of simultaneously network relay.
Wherein, predetermined condition is：Real-time sampling difference is less than preset range.I.e. when inversion line voltage and grid line voltage it
Between sampling difference be less than certain numerical value when, it is ensured that even if can also meet the condition of closure during power network asymmetrical three-phase, issue
And the close command of network relay, control and network relay closure.
The disclosed control system for solving grid-connected dash current of the present embodiment, by locking to synchronized phase angle because of sampling and
The delay that cake resistancet comes is compensated, it is ensured that the synchronization of phase；Simultaneously by two real-time point of voltage active reactive component
Solution value is that the synchronized lock phase angle after target control reference value and compensation carries out contravariant vector control, obtains inverter voltage control
Vector, realizes that open loop is slow and opens, it is ensured that the synchronization of amplitude and frequency；In addition, by inversion line voltage and grid line voltage
Difference judged, is on duty value stabilization in smaller range, control and network relay closure, it is ensured that even if power network three-phase is not right
Also can realize closing the minimum of moment impact electric current during title.This programme makes inverter voltage and power network electricity by above-mentioned technological means
The phase of pressure, amplitude and frequency reach stringent synchronization, and grid-connected dash current is reduced into minimum, realize and combining inverter is existed
The control of the dash current in grid-connected start-up course, is greatly reduced the appearance of dash current.In addition, disclosed in the present embodiment
The control method of grid-connected dash current, is applicable not only to situation during to power network asymmetrical three-phase, is also applied for power network three relative
The situation of title.
Present embodiment discloses a kind of control unit, its structural representation as shown in figure 5, including：
The instruction issuance unit 51 being connected with comparing unit, the closed cell 52 being connected with instruction issuance unit, with closure
The connected block unit 53 of unit 52.
Instruction issuance unit is used to, when real-time sampling difference meets predetermined condition, issue and network relay close command.
Closed cell 52 is used to control and network relay closure.
Block unit 53 is used to block open loop pulse, completes synchronous grid-connected.
Control unit disclosed in the present embodiment, by issuing simultaneously network relay close command, makes and network relay is closed, and
Open loop pulse is blocked to realize synchronous grid-connected completion.Ensure that and network relay it is effectively closed, furthermore achieved that grid-connected
The reduction of dash current.
Further, control unit disclosed in the present embodiment, can also include：With closed cell 52 and 53 points of unit of block
Not Xiang Lian delay unit 54.
Closed cell 52 is after simultaneously network relay close command is issued, and network relay is closed, and now delay unit 54 prolongs
When the scheduled time, it is ensured that the reliable closure of relay.
Present embodiment discloses a kind of compensating unit, its structural representation as shown in fig. 6, including：
Second converter unit 61, the opening unit 62 being connected with the second converter unit 61 is same with what opening unit 62 was connected
Step lock phase angle compensation unit 63.
Second converter unit 61 is used to carry out the second change by locking phase angle to target control reference value and synchronized voltage
Change, obtain the second inverter voltage control vector.
Opening unit 62 is used to open ring pulse.
Genlock angle compensation unit 63 is used to be compared the inverter voltage in ring pulse with power network three-phase voltage, when
When the inverter voltage of ring pulse has phase difference with power network three-phase voltage, the compensation that synchronized locks phase angle is carried out.
The disclosed method compensated to synchronized lock phase angle of the present embodiment, by target control reference value and electricity
Net synchronizing voltage lock phase angle carries out park inverse transformations, obtains ring impulse waveform, and inverter voltage and power network three-phase are found out from waveform
Be present phase difference in voltage, now, synchronized lock phase angle is compensated so that between inverter voltage and power network three-phase voltage
Phase difference is 0, it is ensured that phase between inverter voltage and power network three-phase synchronous voltage it is synchronous.
Each embodiment is described by the way of progressive in this specification, and what each embodiment was stressed is and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.For device disclosed in embodiment
For, because it is corresponded to the method disclosed in Example, so description is fairly simple, related part is said referring to method part
It is bright.
Professional further appreciates that, with reference to the unit of each example of the embodiments described herein description
And algorithm steps, can be realized with electronic hardware, computer software or the combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software, generally describes the composition and step of each example according to function in the above description.These
Function is performed with hardware or software mode actually, depending on the application-specific and design constraint of technical scheme.Specialty
Technical staff can realize described function to each specific application using distinct methods, but this realization should not
Think beyond the scope of this invention.
The step of method or algorithm for being described with reference to the embodiments described herein, directly can be held with hardware, processor
Capable software module, or the two combination is implemented.Software module can be placed in random access memory (RAM), internal memory, read-only deposit
Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology
In field in known any other form of storage medium.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or uses the present invention.
Various modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, the present invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The scope most wide for causing.
Claims (6)
1. a kind of control method for solving grid-connected dash current, it is characterised in that including：
To power network three-phase voltage real-time sampling and lock phase；
Control bus voltage soft reaches predetermined magnitude of voltage, and the predetermined magnitude of voltage is more than power network three-phase uncontrollable rectifier
Value；
The first coordinate transform is carried out to the power network three-phase voltage, and decomposition obtains two real-time point of voltage active reactive component
Solution value, target control reference value is set as by the real-time decomposition value of described two voltage active reactive components；
The second conversion is carried out by locking phase angle to target control reference value and synchronized, inverter voltage control vector, institute is obtained
State second and be transformed to park inverse transformations；
Synchronized lock phase angle is compensated；
Dutycycle is slow to be opened to control the inverter voltage vector to carry out, and pulse is reached the desired value of inversion phase voltage；
Inversion line voltage is compared with the real-time sampling value of grid line voltage, real-time sampling difference is obtained；
When the real-time sampling difference meets predetermined condition, issue and network relay close command, delay predetermined time, control
And the closure of network relay；
Wherein, the predetermined condition is：Real-time sampling difference is less than preset range；
It is described that synchronized lock phase angle is compensated specially：
The second conversion is carried out by locking phase angle to target control reference value and synchronized voltage, the control of the second inverter voltage is obtained
Vector；
Open ring pulse；
Inversion phase voltage in the ring pulse and power network three-phase voltage are compared, when the inversion phase voltage of the ring pulse
When there is phase difference with power network three-phase voltage, the compensation that synchronized locks phase angle is carried out.
2. method according to claim 1, it is characterised in that when the real-time sampling difference meets predetermined condition, control
The closure of simultaneously network relay is made, is specifically included：
When the real-time sampling difference meets predetermined condition, issue and network relay close command；
Described and network relay is closed；
Block open loop pulse, completes synchronous grid-connected.
3. method according to claim 1, it is characterised in that first coordinate is transformed to：Clark/park is converted；Institute
Second is stated to be transformed to：Park inverse transformations.
4. a kind of control system for solving grid-connected dash current, it is characterised in that including：Sampling unit, with the sampling unit
It is connected it is soft open unit, with it is described it is soft open the voltage decomposition unit that unit is connected, compensating unit, with the voltage decomposition unit and
The converter unit that compensating unit is respectively connected with, the open loop being connected with the converter unit is slow to open unit, slow with the open loop to open list
The connected comparing unit of unit, the control unit being connected with the comparing unit, wherein：
The sampling unit is used for power network three-phase voltage real-time sampling and locks phase；
The soft unit that opens reaches predetermined magnitude of voltage for control bus voltage soft, and the predetermined magnitude of voltage is more than electricity
Net three-phase uncontrollable rectifier value；
The voltage decomposition unit is used to carry out the power network three-phase voltage the first coordinate transform, and decomposition obtains two voltages
The real-time decomposition value of active reactive component, target control is set as by the real-time decomposition value of described two voltage active reactive components
Reference value；
The converter unit is used to carry out the second conversion to target control reference value and synchronized lock phase angle, obtains inverter voltage
Control vector, described second is transformed to park inverse transformations；
The compensating unit is used to compensate synchronized lock phase angle；
The open loop is slow to open unit dutycycle is slow to be opened for being carried out to inverter voltage control vector, pulse is reached inversion phase
The desired value of voltage；
The comparing unit is used to be compared inversion line voltage with the real-time sampling value of grid line voltage, obtains real-time sampling
Difference；
Described control unit is used to, when the real-time sampling difference meets predetermined condition, issue and network relay close command,
Delay predetermined time, controls the closure of simultaneously network relay；
Wherein, the predetermined condition is：Real-time sampling difference is less than preset range；
The compensating unit includes：Second converter unit, the opening unit being connected with second converter unit, with the unlatching
The connected genlock angle compensation unit of unit, wherein：
Second converter unit is used to carry out the second conversion by locking phase angle to target control reference value and synchronized voltage,
Obtain the second inverter voltage control vector；
The opening unit is used to open ring pulse；
The genlock angle compensation unit is used to compare the inversion phase voltage in the ring pulse and power network three-phase voltage
Compared with when inversion phase voltage and the power network three-phase voltage of the ring pulse have phase difference, carrying out the benefit that synchronized locks phase angle
Repay.
5. system according to claim 4, it is characterised in that described control unit includes：It is connected with the comparing unit
Instruction issuance unit, and the instruction closed cell that is connected of issuance unit, the block unit being connected with the closed cell,
Wherein：
The instruction issuance unit is used to, when the real-time sampling difference meets predetermined condition, issue and network relay closure refers to
Order；
The closed cell is used to control described and network relay to close；
The block unit is used to block open loop pulse, completes synchronous grid-connected.
6. system according to claim 5, it is characterised in that described control unit also includes：With the closed cell and
The delay unit that block unit is respectively connected with, wherein：
The delay unit is used for after simultaneously network relay close command is issued, delay predetermined time.
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| CN201410374955.3A CN104104114B (en) | 2014-07-31 | 2014-07-31 | A kind of control method and system for solving grid-connected dash current |
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| CN201410374955.3A CN104104114B (en) | 2014-07-31 | 2014-07-31 | A kind of control method and system for solving grid-connected dash current |
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| CN111917351B (en) * | 2020-07-29 | 2022-04-01 | 深圳和而泰智能控制股份有限公司 | Angle compensation method for noninductive control of motor and motor controller |
| CN111864809B (en) * | 2020-07-31 | 2022-01-14 | 珠海银河耐吉科技股份有限公司 | Starting method of grid-connected inverter |
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| US7183667B2 (en) * | 2003-12-19 | 2007-02-27 | Square D Company | Method and apparatus for power inverter synchronization |
| JP2009273206A (en) * | 2008-05-02 | 2009-11-19 | Meidensha Corp | Phase synchronization method for uninterruptible power supply unit |
| CN101719679B (en) * | 2009-12-21 | 2013-04-24 | 中国电力科学研究院 | Method for synchronizing distributed power supply and power grid |
| CN101789606B (en) * | 2010-03-12 | 2012-09-19 | 阳光电源股份有限公司 | Startup method for synchronization without insulating photovoltaic grid-connected inverters |
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