CN104682414B - A kind of many transverters realize off-grid method from grid-connected - Google Patents
A kind of many transverters realize off-grid method from grid-connected Download PDFInfo
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Abstract
Off-grid method is realized from grid-connected the invention provides a kind of many transverters, it is mainly included the following steps that successively：S10, detection and judge power network whether dead electricity, if so, then perform step S20, if it is not, then return continue executing with step S10；S20, controller control certain transverter to switch to off-network pattern：I.e. controller sends voltage-phase revision directive in predetermined period to certain transverter, and voltage-phase revision directive described in certain inverter makes the phase and the predetermined reference Phase synchronization of controller of its output voltage in predetermined period；S30, controller disconnect and off-network switch；S40, controller control remaining transverter to sequentially enter off-network pattern：Controller controls remaining transverter to correct the phase of its own output voltage successively, so that predetermined reference Phase synchronization of the phase of output voltage of remaining transverter in predetermined period with controller.The method that the present invention is provided can make the realization of many transverter smooth-goings and off-network switching.
Description
Technical field
The present invention relates to a kind of micro-capacitance sensor field, more particularly to a kind of many transverters off-grid method is realized from grid-connected.
Background technology
With the progress and the development of society of science and technology, modern society increasingly increases the demand of electric power.Centralized bulk power grid
Some shortcomings are shown in actual motion, such as operating cost is high, be difficult to meet the higher and higher safety and reliability of user
It is required that, and micro-capacitance sensor can make up the deficiency of bulk power grid very well.As China strengthens the stage that intelligent grid enters all-round construction,
As the micro-capacitance sensor of the important component of intelligent grid, it will also be connect in demonstration project, electric automobile electric charging equipment, new energy
Receive, be more widely used in terms of Intelligent resident electricity utilization.Micro-capacitance sensor is by power supply, converter, control device and born
The system that lotus collectively constitutes, be one can self-monitoring, operation, protection autonomous system.Micro-capacitance sensor both can be with external electrical
Net is incorporated into the power networks, can also isolated operation（That is off-grid operation）.
So as needed, the transverter in micro-capacitance sensor can be separately operable under grid-connected and off-network pattern.In order to ensure
The normal operation of load, transverter is when carrying out and off-network switches, it is necessary to ensure the smooth-going of output voltage.Although in the prior art
The transverter of separate unit from it is grid-connected be switched to off-network when by electric current and voltage impact it is smaller, still, micro-capacitance sensor usually requires many
Individual energy-storage battery group and the parallel connection of multiple transverters are with powering load.However, in the prior art, including many changes of current in parallel
The micro-capacitance sensor of device from it is grid-connected switch to off-network when, it is generally larger by the impact of electric current and voltage so that many changes of current in parallel
Device is difficult to smooth switch to off-network pattern from grid-connect mode.
It is understood that the statement of this part only provides background information related to the present invention, not possible composition or structure
Into so-called prior art.
The content of the invention
The technical problems to be solved by the invention are difficult to smooth-going when being for many transverters parallel connections of prior art
Switch to off-grid defect from grid-connected there is provided a kind of many transverters and realize off-grid method from grid-connected so that many parallel connections
Transverter can smooth out switch to off-network from grid-connected, and then reduce micro-capacitance sensor and impacted by voltage and electric current.
The technical solution adopted for the present invention to solve the technical problems be to provide a kind of many transverters from it is grid-connected realize from
The method of net, for many transverters in parallel to be switched into off-network state from simultaneously net state, it mainly includes following step successively
Suddenly：
S10, detection and judge power network whether dead electricity, if so, then perform step S20, if it is not, then return continue executing with step
S10；
S20, controller control certain transverter to switch to off-network pattern：I.e. controller in predetermined period to described certain
Transverter sends voltage-phase revision directive, and voltage-phase revision directive described in certain inverter makes it in predetermined week
The phase of output voltage in phase and the predetermined reference Phase synchronization of controller；
S30, controller disconnect and off-network switch；
S40, controller control remaining transverter to sequentially enter off-network pattern：Controller controls remaining transverter successively
Correct the phase of its own output voltage so that the phase of output voltage of remaining transverter in predetermined period with control
The predetermined reference Phase synchronization of device.
Realize off-grid method from grid-connected in above-mentioned many transverters, it is described correct its own output voltage phase be
Realized by transverter changes the frequency of its own output voltage.
Off-grid method is realized from grid-connected in above-mentioned many transverters, step S50 is also included after step S40：Control
Device calculates the average output power of all transverters and by the average output according to the present output power of every transverter
Power is sent to each transverter.
Off-grid method is realized from grid-connected in above-mentioned many transverters, is also included after step S50：Every transverter
Respective final output power is adjusted according to the present output power of itself and the difference of average output power, so that every is changed
The final output power for flowing device is consistent with the average output power.
Off-grid method is realized from grid-connected in above-mentioned many transverters, the present output power of every transverter is by every
Transverter oneself detection calculates and the present output power of calculating is uploaded into controller.
Off-grid method is realized from grid-connected in above-mentioned many transverters, every transverter oneself adjusts its output voltage
Amplitude and frequency adjust respective final output power.
Off-grid method is realized from grid-connected in above-mentioned many transverters, when increasing current acquisition between load and power network
Device and current collector judge electrical breakdown when collecting the output of power network no current, or when the output electricity for changing certain transverter
Judge electrical breakdown when the frequency of the output voltage of power network accordingly changes during the frequency of pressure.
Off-grid method is realized from grid-connected in above-mentioned many transverters, is also wrapped between above-mentioned steps S20 and step S30
Include：Certain transverter sends off-network and switched successfully to controller to be indicated.
Off-grid method is realized from grid-connected in above-mentioned many transverters, in step S40, when every transverter output electricity
During predetermined reference Phase synchronization of the phase of pressure with controller, last realizes that phase locked transverter is sent out to controller
Send Phase synchronization Success Flag.
Off-grid method is realized from grid-connected in above-mentioned many transverters, the off-network switches successfully mark and the phase
Synchronous Success Flag is sent to controller by photosignal or message form.
Many transverters that the present invention is provided realize off-grid method from grid-connected, and it is by first judging whether power network loses
Electricity, then controller first controls a transverter to carry out and off-network switching after electrical breakdown, and and then controller controls remaining
Transverter switch over one by one in order, i.e., and then controller control remaining transverter successively in predetermined period will
The phase adjustment of respective output voltage is to the predetermined reference Phase synchronization with controller, therefore it can make many changes of current in parallel
What device was smoothed out switches to off-network from grid-connected, and then reduction micro-capacitance sensor is impacted by voltage and electric current.
Brief description of the drawings
Fig. 1 is the circuit block diagram that many transverter parallel connections form micro-capacitance sensor；
Fig. 2 is that many transverters in parallel that one embodiment of the invention is provided switch to off-grid flow chart by grid-connected；
Fig. 3 is that many transverters in parallel that further embodiment of this invention is provided switch to off-grid flow chart by grid-connected.
Embodiment
In order that technical problem solved by the invention, technical scheme and beneficial effect are more clearly understood, below in conjunction with
Drawings and Examples, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used to
The present invention is explained, is not intended to limit the present invention.
In the description of the invention, it is to be understood that term " longitudinal direction ", " transverse direction ", " on ", " under ", "front", "rear",
The orientation or position relationship of the instruction such as "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer " is based on accompanying drawing institutes
The orientation or position relationship shown, is for only for ease of the description present invention and simplifies description, rather than indicate or imply signified dress
Put or element there must be specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to the limit of the present invention
System.
It is used for many transverters the invention provides one kind and realizes off-grid method from grid-connected, this method is mainly used in micro- electricity
In net, many transverters in parallel are switched into off-network state from simultaneously net state.Referring to Fig. 1, it is the structural frames of micro-capacitance sensor
Figure, micro-capacitance sensor with lower module mainly by being constituted：X platforms transverter in parallel（x = 1~N）, x energy-storage battery group（x = 1~N）、
Controller and off-network switch, load and power network.Transverter x DC side is electrically connected with corresponding energy-storage battery group；The many changes of current
After device is connected with corresponding energy-storage battery, many transverter ACs are in parallel, then many transverters are electrically connected with load, and many
Platform transverter is switched by simultaneously off-network（Simultaneously off-network switch is the switch of three-phase in figure, with corresponding with three phase network）It is electrically connected with power network
Connect.Wherein, transverter, controller, power network can carry out data interaction by data wire.Each transverter will be run by data wire joins
Number etc. is sent to controller, and controller sends commands to each transverter by data wire, and operation of power networks parameter can also pass through number
Controller is transferred to according to line, controller is switched on-off by data line traffic control and off-network, to control the company of transverter and power network
Connect and disconnect.
Referring to shown in Fig. 2 and Fig. 3, one kind that the present invention is provided realizes off-grid method master for many transverters from grid-connected
Comprise the following steps：
S10, detection and judge power network whether dead electricity, if so, then perform step S20, if it is not, then return continue executing with step
S10；Specifically, when detection determines electrical breakdown, micro-capacitance sensor needs to start to perform from and net state switches to off-network state,
If the non-dead electricity of power network, continue by power network powering load, and continue to detect and judge power network whether dead electricity.
S20, controller control certain transverter to switch to off-network pattern：I.e. controller in predetermined period to described certain
Transverter sends voltage-phase revision directive, and voltage-phase revision directive described in this certain inverter makes it in predetermined period
The phase of interior output voltage and the predetermined reference Phase synchronization of controller；Specifically, controller first controls a certain transverter
Off-network pattern is switched to, when transverter is in simultaneously net state, transverter is in constant current output state, when transverter is in off-network shape
During state, transverter is in constant pressure output state.So, when certain transverter is carried out and off-network switches, controller is described by control
The output current of certain transverter（Or power output）Switch to the output voltage of control certain transverter.Controller is sent
The amendment for making this transverter enter line output voltage in the given time to certain transverter is instructed, even if certain transverter is pre-
Predetermined reference Phase synchronization of the phase adjustment of output voltage in fixed cycle extremely with controller.For example, predetermined in controller
Fixed phase is 10 degree, and controller control First transverter carries out an output voltage amendment in 20ms, so that First
The phase of output voltage of the transverter in 20ms is 10 degree.
S30, controller disconnect and off-network switch；
S40, controller control remaining transverter to sequentially enter off-network pattern：Controller controls remaining transverter successively
Correct the phase of its own output voltage so that the phase of output voltage of remaining transverter in predetermined period with control
The predetermined reference Phase synchronization of device.Specifically, controller goes to control remaining N-1 platform transverter to cut in a predetermined sequence successively
Off-network module is shifted to, so that predetermined reference of the phase of output voltage of remaining transverter in predetermined period with controller
Phase synchronization.After the completion of the step, then the phase of the output voltage of all transverters is consistent, and and controller
Predetermined reference phase it is identical, then the output voltage of each transverter is no longer influenceed by power network, but all transverter is defeated
The phase for going out voltage controls to determine by controller.Therefore each transverter realizes from grid-connected and switches to off-network, simultaneously as control
Device processed is that each transverter of control going one by one is realized and off-network switching, so it can make the whole of many transverters formation in parallel
What body was smoothed out switches to off-network from grid-connected, and then can integrally reduce fluctuating for the voltage and current being subject to during switching.
In above-mentioned and off-network handoff procedure, controller is changed into control voltage signal from control electric current signal, it is preferable that
Under the control of controller, the phase of its own output voltage of each transverter amendment mainly changes its own by transverter and exported
The frequency of voltage is realized.For example, every transverter oneself is according to VF algorithms（That is the sagging algorithm of electric voltage frequency, VF algorithms are this
Known to art personnel）To adjust its output frequency, to change the phase of its output.This mode can make each transverter fast
Speed accurately corrects the phase of its output voltage.And controller determines the aim parameter of each transverter amendment.
It is shown in Figure 3, in a preferred embodiment of the invention, step S50 is also included after step S40：Controller root
The average output power of all transverters is calculated according to the present output power of every transverter and by the average output power
Send to each transverter, so can understand working condition and remaining change of current of its own in order to controller and each transverter
The working condition of device, and then can be in order to the coordination of progress power output between each transverter.It is highly preferred that step S50 it
Also include afterwards：The present output power of every inverter itself and the difference of average output power are respective final to adjust
Power output, so that the final output power of every transverter is consistent with the average output power.I.e. each transverter can be with
Realize that power output is consistent, to realize that stream is exported.What deserves to be explained is, the present output power of every transverter can be by it
Oneself detection is calculated, then is uploaded to controller and is calculated by controller the average output power of all transverters,
Detection can be directly gone to calculate the present output power of every transverter and the average output work of all transverter by controller
Rate.Preferably, the present output power of every transverter is detected by every transverter oneself and calculated and current by what is calculated
Power output is uploaded to controller, so can both improve and off-grid switching efficiency can also be reduced and off-network switching is to load
Impact influence.Preferably simultaneously, every transverter oneself adjusts the amplitude and frequency of its output voltage to realize that adjustment is respective
Final output power, i.e., each transverter has self adjustment function, and adjusted most by adjusting the amplitude and frequency of voltage
The mode of whole power output also can not only ensure quickly and the impact of off-network switching but also reduction and off-network switching on load influences.
What deserves to be explained is, the detection judges whether dead electricity has a variety of methods to power network, it is preferable that when load with
Increase current collector between power network and current collector collects controller when power network no current is exported and judges electrical breakdown, or
Person's controller when the frequency of output voltage of power network accordingly changes when changing the frequency of output voltage of certain transverter
Judge electrical breakdown.This mode can fast and accurately detect judge power network whether dead electricity, fast and accurately to judge to be
It is no to need and off-network switching.
There is provided the present invention further in conjunction with Fig. 3 and off-network switching method is described below：
S100, controller detection and judge whether power network disappears, so as to system judge whether needs by it is grid-connected switch to from
Net, if power network disappears, performs next step, if it is not, then continuing executing with this step.
S200, controller send off-network order to First transverter, to control First transverter to switch to off-network mould
Formula, and remaining transverter is remained running under grid-connect mode；Specifically, controller sends one in 50ms to First transverter
Secondary voltage-phase revision directive, is adjusted the phase of output voltage to 0 degree in 50ms with order First transverter by 30 degree
（I.e. the predetermined reference phase of controller is 0 degree）.
S300, when First transverter complete above-mentioned phase only pupil filter after, First transverter is to realize to switch to off-network
Pattern, First transverter is sent off-network and switched successfully by photosignal or message form to controller to be indicated.
S400, controller receive off-network switch successfully mark after can judge First transverter complete and from
Net switching, then simultaneously off-network switches off power network for controller control.
S500, controller control remaining transverter to sequentially enter off-network pattern：Controller control remaining transverter according to
The secondary phase for correcting its own output voltage（I.e. controller sends Phase synchronization instruction to each transverter successively）, so that remaining
Predetermined reference Phase synchronization of the phase of output voltage of the transverter in predetermined period with controller.Specifically, controller
Second transverter, the 3rd transverter, N platforms transverter is controlled to carry out phase only pupil filter successively, to realize each transverter pre-
Predetermined reference Phase synchronization of the phase of output voltage in fixed cycle with controller.Namely controller controls remaining transverter
Off-network pattern is sequentially entered, the synchronizing signal of remaining inverter controller carries out frequency conversion, to correct the phase of output voltage
Position.Finally, all transverters enter off-network pattern under control of the controller；
S600, when last transverter complete above-mentioned phase only pupil filter after, then all transverters are to realize to switch to
Off-network pattern, last transverter sends Phase synchronization Success Flag by photosignal or message form to controller.
S700, the detection of every transverter oneself calculate respective present output power and by respective calculating obtain it is current
Power output is uploaded to controller, and controller calculates being averaged for all transverters according to the present output power of every transverter
Power output simultaneously sends the average output power to each transverter.
S800, the present output power of every inverter itself and average output power difference are respective to adjust
Final output power, so that the final output power of every transverter is consistent with the average output power.
It is visible by above-described embodiment, it is preferable that also to include between above-mentioned steps S20 and step S30：Certain transverter
Off-network, which is sent, to controller switches successfully mark.In step S40, when every inverter output voltage phase and controller
Predetermined reference Phase synchronization when, last realize phase locked transverter to controller send Phase synchronization successfully mark
Will.Controller and whole power network can so fast and accurately realized and off-network switching.Off-network switches successfully mark and phase
Synchronous Success Flag can be sent by diversified forms to controller, for example, off-network switches successfully mark and Phase synchronization success
Mark can be sent to controller by photosignal or message.
In summary, many transverters that the present invention is provided realize off-grid method while having advantages below from grid-connected：
1）Many transverter and off-network switchings in parallel can be realized；
2）The progress and off-network switching of many transverters smooth-goings in parallel can be ensured, and reduce and during off-network switching by
To the impact of voltage and current；
3）Stream output is realized after many transverters in parallel and off-network switching can be ensured.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or the spy that the embodiment or example are described
Point is contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not
Necessarily refer to identical embodiment or example.Moreover, specific features, structure, material or the feature of description can be any
One or more embodiments or example in combine in an appropriate manner.
In the description of the invention, unless otherwise prescribed with limit, it is necessary to explanation, term " installation ", " connected ",
" connection " should be interpreted broadly, for example, it may be mechanically connect or electrical connection or the connection of two element internals, can
To be to be joined directly together, it can also be indirectly connected to by intermediary, for the ordinary skill in the art, can basis
Concrete condition understands the concrete meaning of above-mentioned term.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
Any modifications, equivalent substitutions and improvements made within refreshing and principle etc., should be included in the scope of the protection.
Claims (9)
1. a kind of many transverters realize off-grid method from grid-connected, for many transverters in parallel to be switched from simultaneously net state
To off-network state, it is characterised in that mainly include the following steps that successively：
S10, detection and judge power network whether dead electricity, if so, then perform step S20, if it is not, then return continue executing with step S10；
S20, controller control certain transverter to switch to off-network pattern：Controller is in predetermined period to certain transverter
Voltage-phase revision directive is sent, voltage-phase revision directive described in certain inverter makes it in predetermined period
The phase of output voltage and the predetermined reference Phase synchronization of controller；
S30, controller disconnect and off-network switch；
S40, controller control remaining transverter to sequentially enter off-network pattern：Controller controls remaining transverter to correct successively
The phase of its own output voltage so that the phase of output voltage of remaining transverter in predetermined period with controller
Predetermined reference Phase synchronization；
Wherein, the phase for correcting its own output voltage is by transverter changes the frequency of its own output voltage Lai real
It is existing.
2. the method as described in claim 1, it is characterised in that also include step S50 after step S40：
Controller calculates the average output power of all transverters according to the present output power of every transverter and will be described
Average output power is sent to each transverter.
3. method as claimed in claim 2, it is characterised in that also include after step S50：Every inverter itself
Present output power and the difference of average output power adjust respective final output power so that every transverter is most
Whole power output is consistent with the average output power.
4. method as claimed in claim 2 or claim 3, it is characterised in that the present output power of every transverter is by every change of current
Device oneself detection calculates and the present output power of calculating is uploaded into controller.
5. method as claimed in claim 3, it is characterised in that every transverter oneself adjusts the amplitude and frequency of its output voltage
Rate adjusts respective final output power.
6. the method as described in claim 1, it is characterised in that when increase current collector and electric current between load and power network
Collector judges electrical breakdown when collecting the output of power network no current, or when the frequency for the output voltage for changing certain transverter
When power network the frequency of output voltage judge electrical breakdown when accordingly changing.
7. the method as described in claim 1, it is characterised in that also include between above-mentioned steps S20 and step S30：It is described
Certain transverter sends off-network and switched successfully to controller to be indicated.
8. method as claimed in claim 7, it is characterised in that in step S40, when the phase of every inverter output voltage
During predetermined reference Phase synchronization with controller, it is same that last realizes that phase locked transverter sends phase to controller
Walk Success Flag.
9. method as claimed in claim 8, it is characterised in that the off-network switches successfully mark and Phase synchronization success
Mark is sent to controller by photosignal or message form.
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| CN111355269B (en) * | 2020-03-16 | 2023-09-12 | 国网江苏电力设计咨询有限公司 | Multi-converter control method based on synchronous pulse |
| CN114006377B (en) * | 2021-11-08 | 2024-08-09 | 北京四方继保自动化股份有限公司 | Method for realizing synchronous control of multiple power electronic devices by PPS signals |
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