CN109842154A - A kind of means of relay controlling and device of gird-connected inverter - Google Patents
A kind of means of relay controlling and device of gird-connected inverter Download PDFInfo
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- CN109842154A CN109842154A CN201910123430.5A CN201910123430A CN109842154A CN 109842154 A CN109842154 A CN 109842154A CN 201910123430 A CN201910123430 A CN 201910123430A CN 109842154 A CN109842154 A CN 109842154A
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Abstract
The means of relay controlling and device of gird-connected inverter provided by the invention, this method is after the inverter voltage of gird-connected inverter reaches stable state, control relay closure, and starts timing.Within the period that timing duration is not up to time threshold, if detecting, inverter current actual value is greater than or equal to current threshold, and control inverter current actual value is decreased within the scope of predetermined current.When timing duration is greater than or equal to time threshold, think that closed action is completed in relay, control gird-connected inverter is out of service in current operation mode at this time, such as, it can control directly out of service, alternatively, control gird-connected inverter is directly switch into normal grid-connected operating mode from current operation mode.Therefore this method is not influenced by directly controlling the inverter current of gird-connected inverter by grid voltage quality, can inhibit dash current during closing relay when grid voltage quality is bad.
Description
Technical field
The invention belongs to inversion transformation technique field more particularly to the means of relay controlling and device of a kind of gird-connected inverter.
Background technique
The frequency of the alternating voltage of gird-connected inverter output and the frequency and Phase synchronization of phase and network voltage, therefore,
The alternating current of gird-connected inverter output can directly input in power grid.Gird-connected inverter accesses power grid by relay.Due to inverse
Become side with the presence of filter capacitor, if direct closing relay, power grid plugs in filter capacitor by relay, charging
When dash current it is very big, will lead to when serious inversion system important devices damage.
The method of dash current includes following two mode when inhibiting relay to be closed in the prior art: one is in electricity
Closing relay when net voltage over zero；When another kind is that the output voltage of control gird-connected inverter is consistent with network voltage, close
Close relay.The impact electricity that both modes generate when effectively relay can be inhibited to be closed when grid voltage quality is preferable
Stream, but the dash current that relay closure generates when power grid distortion is serious or Voltage Harmonic is larger is still very big.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of means of relay controlling of gird-connected inverter, to inhibit electricity
The dash current that relay closure generates when net distortion is serious or voltage harmonic is larger, its technical solution is as follows:
In a first aspect, the present invention provides a kind of means of relay controlling of gird-connected inverter, comprising:
After the inverter voltage for controlling the gird-connected inverter reaches stable state, control connects with the gird-connected inverter
The relay closure connect, and start timing；
When timing duration is not up to time threshold, if detecting, the inverter current actual value of the gird-connected inverter is big
In or equal to the first current threshold, controls the inverter current actual value and be decreased within the scope of predetermined current；
When the timing duration be greater than or equal to the time threshold when, control the gird-connected inverter it is out of service
Current operation mode.
Optionally, the control inverter current actual value is decreased within the scope of predetermined current, comprising:
The numerical value inverter current reference value of the gird-connected inverter being set as within the scope of the predetermined current；
According to the inverter current reference value and the inverter current actual value, controlled using feedback controling mode described in
The inverter current actual value of gird-connected inverter is decreased within the scope of the predetermined current.
Optionally, the control inverter current actual value is decreased within the scope of predetermined current, further includes:
When detecting that the inverter current actual value is within the scope of the predetermined current, the inverter current is referred to
Value is used as the inverter current actual value.
Optionally, when the voltage difference absolute value between the inverter voltage and network voltage of the gird-connected inverter is less than electricity
When pressing threshold value, determine that the inverter voltage reaches stable state.
Second aspect, the present invention also provides a kind of means of relay controlling of gird-connected inverter, comprising:
After the inverter voltage for controlling the gird-connected inverter reaches stable state, control connects with the gird-connected inverter
The relay closure connect, and start timing；
When timing duration is not up to time threshold, whether the inverter current actual value for detecting the gird-connected inverter is big
In or equal to the second current threshold；
If the inverter current actual value is greater than or equal to the second current threshold, alternatively, the timing duration is greater than or waits
In the time threshold, it is out of service in current operation mode to control the gird-connected inverter.
The third aspect, the present invention also provides a kind of relay control devices of gird-connected inverter, comprising:
First relay control module, after reaching stable state in the inverter voltage for controlling the gird-connected inverter,
The relay closure connecting with the gird-connected inverter is controlled, and starts timing；
Current control module, for when timing duration is not up to time threshold, if detecting the gird-connected inverter
Inverter current actual value is greater than or equal to the first current threshold, controls the inverter current actual value and is decreased to predetermined current model
In enclosing；
First stops control module, is used for when the timing duration is greater than or equal to the time threshold, described in control
Gird-connected inverter is out of service in current operation mode.
Optionally, the current control module includes:
First reference value sets submodule, for the inverter current reference value of the gird-connected inverter to be set as described
Numerical value within the scope of predetermined current；
Control submodule, for being controlled using feedback according to the inverter current reference value and the inverter current actual value
The inverter current actual value that mode processed controls the gird-connected inverter is decreased within the scope of the predetermined current.
Optionally, the current control module further include:
Second reference value sets submodule, detects the inverter current actual value in the predetermined current model for working as
When enclosing interior, using the inverter current reference value as the inverter current actual value.
Optionally, the relay control device of the gird-connected inverter further include: stable state determining module, for working as
When voltage difference absolute value between the inverter voltage and network voltage of the gird-connected inverter is less than voltage threshold, described in determination
Inverter voltage reaches stable state.
Fourth aspect, the present invention also provides the relay control devices of another gird-connected inverter, comprising:
Second relay control module, after reaching stable state in the inverter voltage for controlling the gird-connected inverter,
The relay closure connecting with the gird-connected inverter is controlled, and starts timing；
Current detection module, for detecting the inversion of the gird-connected inverter when timing duration is not up to time threshold
Whether current actual value is greater than or equal to the second current threshold；
Second stops control module, if it is greater than or equal to the second current threshold for the inverter current actual value, or
Person, the timing duration are greater than or equal to the time threshold, it is out of service in work at present mould to control the gird-connected inverter
Formula.The means of relay controlling of gird-connected inverter provided in this embodiment, this method reach in the inverter voltage of gird-connected inverter
After stable state, control relay closure, and start timing.Within the period that timing duration is not up to time threshold, if inspection
Inverter current actual value is measured more than or equal to current threshold, control inverter current actual value is decreased within the scope of predetermined current.
When timing duration is greater than or equal to time threshold, it is believed that closed action is completed in relay, controls parallel network reverse at this time
Device is out of service in current operation mode.This method is by directly controlling the inverter current of gird-connected inverter, therefore, not by electricity
Net quality of voltage influences, and can inhibit dash current during closing relay when grid voltage quality is bad.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will to embodiment or
Attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Bright some embodiments for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is control principle drawing of the gird-connected inverter provided in an embodiment of the present invention before being incorporated into the power networks；
Fig. 2 is a kind of flow chart of the means of relay controlling of gird-connected inverter provided in an embodiment of the present invention；
Fig. 3 is the flow chart of the means of relay controlling of another gird-connected inverter provided in an embodiment of the present invention；
Fig. 4 is the curve synoptic diagram of the corresponding inverter current of control method shown in Fig. 3；
Fig. 5 is the flow chart of the means of relay controlling of another gird-connected inverter provided in an embodiment of the present invention；
Fig. 6 is the curve synoptic diagram of the corresponding inverter current of Fig. 5 control method；
Fig. 7 is a kind of block diagram of the relay control device of gird-connected inverter provided in an embodiment of the present invention；
Fig. 8 is the block diagram of the relay control device of another gird-connected inverter provided in an embodiment of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Referring to Figure 1, control principle of the gird-connected inverter provided in an embodiment of the present invention before being incorporated into the power networks is shown
Figure, before relay closure, which uses Voltage loop and electric current loop double -loop control mode, and power grid electricity is added
Pressure feedforward.
As shown in Figure 1, Voltage loop is with inverter voltage reference value Vinv_refFor input, with inverter voltage actual value Vinv_real
For feedback, the output of Voltage loop is inverter current reference value Iinv_ref。
Electric current loop is with inverter current reference value Iinv_refFor input, with inverter current actual value Iinv_realFor feedback, electric current
The output of ring is that inverter voltage adjusts difference Vdelta。
Then, by VdeltaWith network voltage Vgrid(alternatively, inverter voltage reference value Vinv_ref) control after superposition it is grid-connected inverse
Become device, it can utilize VdeltaAnd VgridThe voltage of superposing control gird-connected inverter output, alternatively, also can use VdeltaWith
Vinv_refThe voltage of superposing control gird-connected inverter output.
Wherein, inverter voltage reference value can be calculated by power grid locking phase, network voltage virtual value；In addition, in order to
Alleviate sampling delay bring error, can use line voltage sampled value and network voltage differential value synthesizes to obtain inversion electricity
Press reference value.Inverter voltage reference value is better closer to network voltage actual value, carries out in the inverter voltage to gird-connected inverter
When closed-loop control, the inverter voltage of gird-connected inverter output can be made closer to network voltage.
Fig. 2 is referred to, a kind of flow chart of means of relay controlling provided in an embodiment of the present invention, this method are shown
It can be applied in single-phase or multiphase (for example, two-phase, three equal) gird-connected inverter, as shown in Fig. 2, this method may include
Following steps:
S110, after the inverter voltage of control gird-connected inverter reaches stable state, control relay closure, and start
Timing.
Before gird-connected inverter brings into operation, relay is in an off state；When needing closing relay, first with
Control ring control gird-connected inverter operation shown in FIG. 1, before relay closure, gird-connected inverter and the non-shape of network voltage
At closed circuit, inverter current will not be generated, still, there are inverter voltages, therefore, at this point, Voltage loop operates normally, and it is electric
The inverter current reference value for flowing ring is determined finally that the inverter voltage of control gird-connected inverter output is practical by the output of Voltage loop
It is worth close to inverter voltage reference value.
As inverter voltage actual value Vinv_realWith network voltage VgridBetween voltage difference absolute value be less than voltage threshold
VΔlimitWhen, i.e., | Vinv_ref-Vgrid| < VΔlimitWhen, it determines that the inverter voltage of gird-connected inverter reaches stable state, shows simultaneously
The inverter voltage and network voltage of net inverter output are almost the same.
Wherein, voltage threshold can be according to control accuracy requirement sets itself, for example, control accuracy requirement is higher, the electricity
Press threshold value smaller；Control accuracy requirement is lower, and the voltage threshold is bigger.
After the inverter voltage and almost the same network voltage of gird-connected inverter output, control and the parallel network reverse are issued
The control instruction of the relay closure of device connection, and start timing.
S120, judges whether timing duration reaches time threshold；If it is not, then S130 is executed, if it is, executing
S150。
After the control instruction for issuing control relay closure, judge whether timing duration T reaches time threshold Tlimit。
Wherein, TlimitIt is determined in conjunction with the response time of all kinds of relays, TlimitIt should be slightly larger than the maximum response of numerical value
Time, i.e. TlimitSetting need to guarantee that it is dynamic that closure is completed in all relays for receiving control instruction under normal circumstances
Make.For example, TlimitIt may be set within the scope of 10ms~50ms.
Whether S130, the inverter current actual value for detecting gird-connected inverter are greater than or equal to the first current threshold, if
It is then to execute S140；S120 is executed if it is not, then returning；
T is not up in timing durationlimitWhen, detect the inverter current actual value I of gird-connected inverterinv_realWhether it is greater than
Or it is equal to the first current threshold Ilimit1, wherein Ilimit1Less than overcurrent protection value.By detect inverter current whether be greater than or
Equal to Ilimit1Whether closed action can have been completed with auxiliary judgment relay.
S140, the inverter current actual value for controlling gird-connected inverter are decreased within the scope of predetermined current.
Wherein, which is [- Ilimit2, Ilimit2], wherein ILimit2 <Ilimit1。
In the application scenarios of multiphase gird-connected inverter, if detecting, inverter current is greater than or equal to Ilimit1, show to
Few two phase relays have completed closed action, form at least one closed circuit.But the relay of multiphase can not be determined at this time
Whether closed action has all been completed, it is thus impossible to directly controlling gird-connected inverter stops current operation mode, but will simultaneously
The inverter current of net inverter is decreased within the scope of predetermined current.Specifically, will be in circuit by electric current loop shown in FIG. 1
Inverter current controls within the scope of predetermined current.
In the application scenarios of single-phase grid-connected inverter, if detecting, inverter current is greater than or equal to Ilimit1, show after
Electric appliance has completed closed action, forms closed circuit, generates electric current in circuit.At this point, the inversion electricity of control gird-connected inverter
Stream is decreased within the scope of predetermined current, and control process is identical as the control process under three-phase applications scene, and details are not described herein again.
Wherein, the I in single-phase grid-connected inverter application scenarioslimit1In multiphase gird-connected inverter application scenarios
Ilimit1Numerical value it is different, need to be set according to practical application request.
After having executed S140, returns to execution S120 and rejudge whether timing duration reaches time threshold.
S150, control gird-connected inverter are out of service in current operation mode.
S150 is executed after timing duration reaches time threshold.
When timing duration reaches TlimitAfterwards, either multiphase gird-connected inverter or single-phase grid-connected inverter think electricity
Closed action is completed in whole relays in road, at this point, control gird-connected inverter no longer operates in current operation mode,
In, current operation mode refers to operating mode locating for gird-connected inverter in relay closing course, for example, such Working mould
Under formula, gird-connected inverter works according to Voltage loop shown in FIG. 1, the control mode of electric current loop；For example, in a possible reality
It applies in example, gird-connected inverter can be directly controlled and stopped working；In another possible embodiment, by gird-connected inverter from
Current operation mode switches to normal grid-connected operating mode.
The means of relay controlling of gird-connected inverter provided in this embodiment, inversion electricity of this method in gird-connected inverter
After pressure reaches stable state, control relay closure, and start timing.The period of time threshold is not up in timing duration
Interior, if detecting, inverter current actual value is greater than or equal to current threshold, and control inverter current actual value is decreased to predetermined current
In range.When timing duration is greater than or equal to time threshold, it is believed that closed action is completed in relay, controls at this time simultaneously
Net inverter is out of service in current operation mode.This method directly controls the inverter current of gird-connected inverter, therefore, not by
Grid voltage quality influences, and can inhibit dash current during closing relay when grid voltage quality is bad.
Fig. 3 is referred to, the means of relay controlling of another gird-connected inverter provided in an embodiment of the present invention is shown
Flow chart, this method, which will focus on, introduces the control process that control inverter current actual value is decreased within the scope of predetermined current.
As shown in figure 3, method includes the following steps:
S210, after the inverter voltage of control gird-connected inverter reaches stable state, control relay closure, and start
Timing.
S220, judges whether timing duration reaches time threshold；If it is not, then S230 is executed, if it is, executing
S270。
Whether S230, the inverter current actual value for detecting gird-connected inverter are greater than or equal to the first current threshold, if
It is then to execute S240；S220 is executed if it is not, then returning；
Wherein, the realization process of realization process difference S110~S130 of S210~S230 is identical, and details are not described herein again.
The inverter current reference value of gird-connected inverter is set as the numerical value within the scope of predetermined current by S240.
T is not up in timing durationlimitWhen, if detecting Iinv_real≥Ilimit1, then by inverter current reference value
Iinv_refSome fixed value being set as in preset range, is preferably set to 0.
S250 controls inverter current using feedback controling mode according to inverter current reference value and inverter current actual value
Actual value is decreased within the scope of predetermined current.
Then, the I of current loop control gird-connected inverter shown in FIG. 1 is utilizedinv_realTend to Iinv_refVariation, to keep away
Exempt to generate dash current in relay closing course.
S260, when detecting that inverter current actual value is within the scope of predetermined current, using inverter current reference value as inverse
Time-dependent current actual value feeds back to electric current loop.
Work as Iinv_realAfter within the scope of predetermined current, control I can be needed not continue at this timeinv_realReach with
Iinv_refEqual level；Moreover, if continuing to control Iinv_realReach Iinv_refIt may cause Vinv_realOccur compared with
Big variation, and then lead to occur dash current in circuit.It therefore, at this time can be by Vinv_realIt is assigned a value of Iinv_ref, that is, this
Electric current loop is set no longer to work in control process.
Wherein, the change curve of inverter current is as shown in figure 4, work as Iinv_realReach Ilimit1Afterwards, it is rapidly decreased to default electricity
Flow range [- Ilimit2, Ilimit2] in.
After having executed S260, returns to execution S220 and rejudge whether timing duration reaches time threshold, when timing
Up to after time threshold, S270 is executed.
S270, control gird-connected inverter are out of service in current operation mode.
After timing duration reaches time threshold, it is believed that whole relays in circuit are all closed, control grid-connected
Inverter is out of service in current operation mode.
The means of relay controlling of gird-connected inverter provided in this embodiment is detecting that it is electric that inverter current is greater than first
After flowing threshold value, directly inverter current reference value is set within the scope of predetermined current, and utilizes current loop control inverter current
Actual value tends to predetermined current range, finally by the control of inverter current actual value within the scope of predetermined current, until timing
Duration reaches time threshold, and control gird-connected inverter is out of service in current operation mode.This method is grid-connected by directly controlling
Therefore the inverter current of inverter is not influenced by grid voltage quality, can when grid voltage quality is bad closing relay
Inhibit dash current during device.
Fig. 5 is referred to, the means of relay controlling of another gird-connected inverter provided in an embodiment of the present invention is shown
Flow chart, method provided in this embodiment is suitable for single-phase grid-connected inverter.As shown in figure 5, this method may include following
Step:
S310, after the inverter voltage of control gird-connected inverter reaches stable state, what control was connect with gird-connected inverter
Relay closure, and start timing.
S320, judges whether timing duration reaches time threshold；If it is not, then S330 is executed, if it is, executing
S340。
Wherein, the implementation process of S310 and S320 is identical as S110 above-mentioned and S120, and details are not described herein again.
Whether S330, the inverter current actual value for detecting gird-connected inverter are greater than or equal to the second current threshold；If
It is then to execute S340；S320 is executed if it is not, then returning.
Second current threshold Ilimit3It is more much smaller than overcurrent protection value.
S340, control gird-connected inverter are out of service in current operation mode.
As the inverter current actual value I of gird-connected inverterinv_real≥Ilimit3When, determine single-phase inverter institute in circuit
All relays closed action is completed, to form closed circuit, therefore, in circuit will appear biggish electric current.This
When, control gird-connected inverter is out of service in current operation mode.
If inverter current actual value is not up to always current threshold, after timing duration reaches time threshold, it is believed that
Closed action is completed in relay in circuit, so that it is out of service in current operation mode to control gird-connected inverter.
Wherein, gird-connected inverter it is out of service current operation mode may include: control gird-connected inverter switch to just
Normal grid-connected operating mode, alternatively, directly out of service.
For control gird-connected inverter directly it is out of service in the case where, the change curve of inverter current as shown in Fig. 6,
Work as Iinv_realReach Ilimit3Afterwards, it is rapidly decreased to 0.
The means of relay controlling of gird-connected inverter provided in this embodiment, inversion electricity of this method in gird-connected inverter
After pressure reaches stable state, control relay closure, and start timing.The period of time threshold is not up in timing duration
Interior, if detecting, inverter current actual value is greater than or equal to current threshold, alternatively, when timing duration is greater than or equal to time threshold
After value, it is believed that closed action is completed in relay, and it is out of service in current operation mode to control gird-connected inverter at this time.It should
Method directly controls the inverter current of gird-connected inverter, therefore, is not influenced by grid voltage quality, can be in network voltage matter
Inhibit dash current when measuring bad during closing relay.
Corresponding to the means of relay controlling embodiment of above-mentioned gird-connected inverter, the present invention also provides parallel network reverses
The relay control device embodiment of device.
Fig. 7 is referred to, a kind of frame of the relay control device of gird-connected inverter provided in an embodiment of the present invention is shown
Figure, the device are applied in single-phase or multiphase gird-connected inverter, and the device as shown in Figure 7 includes the first relay control module
110, current control module 120 and first stops control module 130.
First relay control module 110, after reaching stable state in the inverter voltage for controlling gird-connected inverter,
The relay closure connecting with gird-connected inverter is controlled, and starts timing.
Wherein it is possible to whether reach stable shape by the inverter voltage that stable state determining module detects gird-connected inverter
State, specifically, when the voltage difference absolute value between the inverter voltage of gird-connected inverter and network voltage is less than voltage threshold,
Determine that the inverter voltage reaches stable state.For example, working as inverter voltage actual value Vinv_realWith network voltage VgridBetween
Voltage difference absolute value is less than voltage threshold VΔlimitWhen, i.e., | Vinv_ref-Vgrid| < VΔlimitWhen, determine gird-connected inverter
Inverter voltage reaches stable state.
Before gird-connected inverter brings into operation, relay is in an off state；After inverter voltage reaches stable state,
Relay closure is controlled, and starts timing.
Current control module 120, for when timing duration is not up to time threshold, if detecting gird-connected inverter
Inverter current actual value is greater than or equal to the first current threshold, and control inverter current actual value is decreased within the scope of predetermined current.
Wherein, time threshold TlimitIt is determined in conjunction with the response time of all kinds of relays, TlimitIt should be slightly larger than numerical value most
Big response time, i.e. TlimitSetting need guarantee under normal circumstances, all relays for receiving control instruction are complete
At closed action.For example, TlimitIt may be set within the scope of 10ms~50ms.
In the application scenarios of single-phase grid-connected inverter, if detecting inversion when timing duration is not up to time threshold
Current actual value (that is, inverter current) is greater than or equal to Ilimit1Show that relay has completed closed action, formation is closed back
Road generates electric current in circuit.At this point, the inverter current of control gird-connected inverter is decreased within the scope of predetermined current.
In the application scenarios of multiphase gird-connected inverter, if detecting inversion when timing duration is not up to time threshold
Electric current is greater than or equal to Ilimit1, show that at least two phase relays have completed closed action, form at least one closed circuit.
But it can not determine whether the relay of multiphase has all completed closed action at this time, it is thus impossible to directly control gird-connected inverter
Stop current operation mode, but the inverter current of gird-connected inverter is decreased within the scope of predetermined current.
In one embodiment of the invention, current control module 120 includes the first reference value setting submodule and control
Submodule.
First reference value sets submodule, for the inverter current reference value of gird-connected inverter to be set as default electricity
Flow the numerical value in range.
T is not up in timing durationlimitWhen, if detecting Iinv_real≥Ilimit1, then by inverter current reference value
Iinv_refSome fixed value being set as in preset range, is preferably set to 0.
The control submodule, for utilizing feedback controling mode according to inverter current reference value and inverter current actual value
The inverter current actual value of control gird-connected inverter is decreased within the scope of the predetermined current.
Control submodule utilizes the inverter current actual value I of current loop control gird-connected inverter shown in FIG. 1inv_realBecome
To inverter current reference value Iinv_refVariation, to avoid generating dash current in relay closing course.
Optionally, current control module further includes on the basis of the first reference value sets submodule and control submodule
Second reference settings submodule.
Second reference value sets submodule, for inciting somebody to action when detecting that inverter current actual value is within the scope of predetermined current
Inverter current reference value is as inverter current actual value.
Work as Iinv_realAfter within the scope of predetermined current, control I can be needed not continue at this timeinv_realReach with
Iinv_refEqual level；Moreover, if continuing to control Iinv_realReach Iinv_refIt may cause Vinv_realOccur compared with
Big variation, and then lead to occur dash current in circuit.It therefore, at this time can be by Vinv_realIt is assigned a value of Iinv_ref, that is, this
Electric current loop is set no longer to work in control process.
First stops control module 130, for controlling parallel network reverse when timing duration is greater than or equal to time threshold
Device is out of service in current operation mode.
When timing duration reaches TlimitAfterwards, either multiphase gird-connected inverter or single-phase grid-connected inverter think electricity
Closed action is completed in whole relays in road, at this point, control gird-connected inverter no longer operates in current operation mode.
The relay control device of gird-connected inverter provided in this embodiment reaches in the inverter voltage of gird-connected inverter
After stable state, control relay closure, and start timing.Within the period that timing duration is not up to time threshold, if inspection
Inverter current actual value is measured more than or equal to current threshold, control inverter current actual value is decreased within the scope of predetermined current.
When timing duration is greater than or equal to time threshold, it is believed that closed action is completed in relay, controls gird-connected inverter at this time
It is out of service in current operation mode.The device directly controls the inverter current of gird-connected inverter, therefore, not by network voltage
Quality influences, and can inhibit dash current during closing relay when grid voltage quality is bad.
Fig. 8 is referred to, the relay control device of another gird-connected inverter provided in an embodiment of the present invention is shown
Block diagram, the device are applied in single-phase grid-connected inverter.As shown in figure 8, the device includes: the second relay control module
210, current detection module 220 and second stops control module 230.
Second relay control module 210, after reaching stable state in the inverter voltage for controlling gird-connected inverter,
The relay closure connecting with gird-connected inverter is controlled, and starts timing.
Current detection module 220, for detecting the gird-connected inverter when timing duration is not up to time threshold
Whether inverter current actual value is greater than or equal to the second current threshold.
Second current threshold Ilimit3It is more much smaller than overcurrent protection value.
Second stops control module 230, if being greater than or equal to the second current threshold for inverter current actual value, alternatively,
Timing duration is greater than or equal to the time threshold, and control gird-connected inverter is out of service in current operation mode.
As the inverter current actual value I of gird-connected inverterinv_real≥Ilimit3When, determine single-phase inverter institute in circuit
All relays closed action is completed, to form closed circuit, therefore, in circuit will appear biggish electric current.This
When, control gird-connected inverter is out of service in current operation mode.
If inverter current actual value is not up to always current threshold, after timing duration reaches time threshold, it is believed that
Closed action is completed in relay in circuit, so that it is out of service in current operation mode to control gird-connected inverter.
Wherein, gird-connected inverter it is out of service current operation mode may include: control gird-connected inverter switch to just
Normal grid-connected operating mode, alternatively, directly out of service.
The relay control device of gird-connected inverter provided in this embodiment, inversion electricity of the device in gird-connected inverter
After pressure reaches stable state, control relay closure, and start timing.The period of time threshold is not up in timing duration
Interior, if detecting, inverter current actual value is greater than or equal to current threshold, alternatively, when timing duration is greater than or equal to time threshold
After value, it is believed that closed action is completed in relay, and it is out of service in current operation mode to control gird-connected inverter at this time.It should
Device directly controls the inverter current of gird-connected inverter, therefore, is not influenced by grid voltage quality, can be in network voltage matter
Inhibit dash current when measuring bad during closing relay.
For the various method embodiments described above, for simple description, therefore, it is stated as a series of action combinations,
But those skilled in the art should understand that, the present invention is not limited by the sequence of acts described, because according to this hair
Bright, some steps may be performed in other sequences or simultaneously.Secondly, those skilled in the art should also know that, specification
Described in embodiment belong to preferred embodiment, it is related that actions and modules are not necessarily necessary for the present invention.
It should be noted that all the embodiments in this specification are described in a progressive manner, each embodiment weight
Point explanation is the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other.
For device class embodiment, since it is basically similar to the method embodiment, so being described relatively simple, related place
Illustrate referring to the part of embodiment of the method.
Step in various embodiments of the present invention method can be sequentially adjusted, merged and deleted according to actual needs.
Module in device and terminal and submodule in various embodiments of the present invention can be closed according to actual needs
And it divides and deletes.
In several embodiments provided by the present invention, it should be understood that disclosed terminal, device and method, Ke Yitong
Other modes are crossed to realize.For example, terminal embodiment described above is only schematical, for example, module or submodule
Division, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple submodule
Or module may be combined or can be integrated into another module, or some features can be ignored or not executed.Another point, institute
Display or the mutual coupling, direct-coupling or communication connection discussed can be through some interfaces, device or module
Indirect coupling or communication connection, can be electrical property, mechanical or other forms.
Module or submodule may or may not be physically separated as illustrated by the separation member, as
The component of module or submodule may or may not be physical module or submodule, it can and it is in one place, or
Person may be distributed on multiple network modules or submodule.Part therein or complete can be selected according to the actual needs
Portion's module or submodule achieve the purpose of the solution of this embodiment.
In addition, each functional module or submodule in each embodiment of the present invention can integrate in a processing module
In, it is also possible to modules or submodule physically exists alone, it can also be integrated with two or more modules or submodule
In a module.Above-mentioned integrated module or submodule both can take the form of hardware realization, can also use software function
Energy module or the form of submodule are realized.
Finally, it is to be noted that, herein, relational terms such as first and second and the like are used merely to
Distinguish one entity or operation from another entity or operation, without necessarily requiring or implying these entities or
There are any actual relationship or orders between operation.Moreover, the terms "include", "comprise" or its any other
Variant is intended to non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not
Only include those elements, but also including other elements that are not explicitly listed, or further include for this process, method,
Article or the intrinsic element of equipment.In the absence of more restrictions, being wanted by what sentence "including a ..." limited
Element, it is not excluded that there is also other identical elements in the process, method, article or apparatus that includes the element.
The foregoing description of the disclosed embodiments can be realized those skilled in the art or using the present invention.To this
A variety of modifications of a little embodiments will be apparent for a person skilled in the art, the general principles defined herein
It can realize in other embodiments without departing from the spirit or scope of the present invention.Therefore, the present invention will not
It is intended to be limited to the embodiments shown herein, and is to fit to consistent with the principles and novel features disclosed in this article
Widest scope.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of means of relay controlling of gird-connected inverter characterized by comprising
After the inverter voltage for controlling the gird-connected inverter reaches stable state, control connect with the gird-connected inverter after
Electric appliance closure, and start timing；
When timing duration is not up to time threshold, if detecting, the inverter current actual value of the gird-connected inverter is greater than or waits
In the first current threshold, controls the inverter current actual value and be decreased within the scope of predetermined current；
When the timing duration is greater than or equal to the time threshold, it is out of service in current work to control the gird-connected inverter
Operation mode.
2. the method according to claim 1, wherein the control inverter current actual value is decreased to preset
In current range, comprising:
The numerical value inverter current reference value of the gird-connected inverter being set as within the scope of the predetermined current；
According to the inverter current reference value and the inverter current actual value, controlled using feedback controling mode described grid-connected inverse
The inverter current actual value for becoming device is decreased within the scope of the predetermined current.
3. according to the method described in claim 2, it is characterized in that, the control inverter current actual value is decreased to preset
In current range, further includes:
When detecting that the inverter current actual value is within the scope of the predetermined current, using the inverter current reference value as
The inverter current actual value.
4. the method according to claim 1, wherein working as the inverter voltage and network voltage of the gird-connected inverter
Between voltage difference absolute value be less than voltage threshold when, determine that the inverter voltage reaches stable state.
5. a kind of means of relay controlling of gird-connected inverter characterized by comprising
After the inverter voltage for controlling the gird-connected inverter reaches stable state, control connect with the gird-connected inverter after
Electric appliance closure, and start timing；
When timing duration is not up to time threshold, whether the inverter current actual value for detecting the gird-connected inverter is greater than or waits
In the second current threshold；
If the inverter current actual value is greater than or equal to the second current threshold, alternatively, the timing duration is greater than or equal to institute
Time threshold is stated, it is out of service in current operation mode to control the gird-connected inverter.
6. a kind of relay control device of gird-connected inverter characterized by comprising
First relay control module, after reaching stable state in the inverter voltage for controlling the gird-connected inverter, control
The relay closure being connect with the gird-connected inverter, and start timing；
Current control module, for when timing duration is not up to time threshold, if detecting the inversion of the gird-connected inverter
Current actual value is greater than or equal to the first current threshold, controls the inverter current actual value and is decreased within the scope of predetermined current；
First stops control module, for controlling described grid-connected when the timing duration is greater than or equal to the time threshold
Inverter is out of service in current operation mode.
7. device according to claim 6, which is characterized in that the current control module includes:
First reference value sets submodule, for the inverter current reference value of the gird-connected inverter to be set as the default electricity
Flow the numerical value in range；
Control submodule, for utilizing feedback control side according to the inverter current reference value and the inverter current actual value
The inverter current actual value that formula controls the gird-connected inverter is decreased within the scope of the predetermined current.
8. device according to claim 7, which is characterized in that the current control module further include:
Second reference value sets submodule, detects the inverter current actual value within the scope of the predetermined current for working as
When, using the inverter current reference value as the inverter current actual value.
9. device according to claim 6, which is characterized in that further include: stable state determining module is used for described in simultaneously
When voltage difference absolute value between the inverter voltage and network voltage of net inverter is less than voltage threshold, the inverter voltage is determined
Reach stable state.
10. a kind of relay control device of gird-connected inverter characterized by comprising
Second relay control module, after reaching stable state in the inverter voltage for controlling the gird-connected inverter, control
The relay closure being connect with the gird-connected inverter, and start timing；
Current detection module, for detecting the inverter current of the gird-connected inverter when timing duration is not up to time threshold
Whether actual value is greater than or equal to the second current threshold；
Second stops control module, if being greater than or equal to the second current threshold for the inverter current actual value, alternatively, described
Timing duration is greater than or equal to the time threshold, and it is out of service in current operation mode to control the gird-connected inverter.
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