CN206041519U - Control circuit , dc -to -ac converter control system and inverter system - Google Patents
Control circuit , dc -to -ac converter control system and inverter system Download PDFInfo
- Publication number
- CN206041519U CN206041519U CN201621094265.3U CN201621094265U CN206041519U CN 206041519 U CN206041519 U CN 206041519U CN 201621094265 U CN201621094265 U CN 201621094265U CN 206041519 U CN206041519 U CN 206041519U
- Authority
- CN
- China
- Prior art keywords
- circuit
- inverter
- voltage
- phase
- line voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
The utility model provides a control circuit, dc -to -ac converter control system and inverter system. This control circuit includes: an input unit (10) for an output voltage (Ui), a grid voltage (Us) and a network current (I) of input dc -to -ac converter, one first circuit (20) link to each other with input unit (10) for set up the frequency value at dc -to -ac converter connected to the grid anterior root according to grid voltage (Us) and output voltage (Ui) formation, and set up the frequency value at dc -to -ac converter connected to the grid dorsal radix according to grid voltage (Us) and network current (I) formation, a second circuit (30) link to each other with input unit (10) for generate the set voltage value at dc -to -ac converter connected to the grid anterior root according to grid voltage (Us), and generate the set voltage value at dc -to -ac converter connected to the grid dorsal radix according to network current (I), and an output unit (40) for controlling means output to the dc -to -ac converter sets up frequency value and set voltage value.
Description
Technical field
This utility model is related to field of inserter control, in particular to control circuit, inverter control system and inverse
Become device system.
Background technology
Inverter (also referred to as variable speed motor drives) has been the product of development comparative maturity in commercial Application.Inverter
Many functions can be realized, for example, pump or fan energy-conservation, the speed of control conveyer belt or elevator or moment of torsion and control processing is made
The speed of instrument and position etc..
Fig. 1 is the exemplary topology diagram for motor-driven inverter system according to correlation technique.As shown in figure 1, should
Inverter system includes inverter 2, control device 4, motor M and human-computer interaction interface HMI, and wherein, inverter 2 includes six absolutely
Edge grid bipolar transistor 12.Switched by the high frequency of insulated gate bipolar transistor (abbreviation IGBT) 12, inverter 2 is using control
Unidirectional current is converted to three-phase alternating current by frequency processed and control voltage, and by three-phase alternating current electricity output to motor M with motor
M.What the high frequency switching of insulated gate bipolar transistor 12 was controlled generally by the control device 4 of inverter 2.Inverter
2 operating voltage and operation frequency (arrange magnitude of voltage and arrange frequency values) are generally by user via human-computer interaction interface HMI
Arrange, human-computer interaction interface HMI is the guidance panel for attaching to inverter, or receive the signal from remote controllers.But
It is that this scheme cannot automatically configure the setting magnitude of voltage of control device 4 and arrange frequency values.
In order to automatically configuring the setting magnitude of voltage of control device and arranging frequency values, a feasible scheme is weight
The control device of new design inverter, for example, directly controls insulated gate bipolar transistor using the control device of inverter.So
And, this needs to pay many costs.In some cases, due to the Integration Design mode of the control device of inverter, cause
The control device of inverter can not possibly be redesigned and replace existing control device.
Utility model content
This utility model embodiment provides control circuit, inverter control system and control system, at least to solve
The control device design comparison complexity of inverter, the problem that cost is higher, the suitability is poor in correlation technique.
According to one of the present utility model embodiment there is provided control circuit, fills for the control to an inverter
Put output one and frequency values and a setting magnitude of voltage are set, the control circuit includes：One input block, for being input into the inverter
Output voltage, a line voltage and a power network current, wherein, the line voltage is the voltage of an electrical network, the electrical network electricity
Stream is the electric current of the electrical network；One first circuit, is connected with the input block, for being incorporated to the electrical network in the inverter
It is front that the setting frequency values are generated according to the line voltage and the output voltage, and the electrical network is incorporated in the inverter
The setting frequency values are generated according to the line voltage and the power network current afterwards；One second circuit, with the input block
It is connected, for generating the setting magnitude of voltage according to the line voltage before the inverter is incorporated to the electrical network, and in institute
State after inverter is incorporated to the electrical network and the setting magnitude of voltage is generated according to the power network current；And an output unit, with institute
State the first circuit to be connected with the second circuit, for exporting the setting frequency values to the control device of the inverter
With the setting magnitude of voltage.
By said structure, the control device design comparison that solves inverter in correlation technique is complicated, cost is higher,
The poor problem of the suitability, and then reached simple design, low cost and possessed the effect of wide applicability.
In a schematic embodiment of control circuit, first circuit includes：One mains frequency generates electricity
Road, is connected with the input block, for generating the frequency of the line voltage according to a clock signal and the line voltage；
One phase compensating circuit, is connected with the input block, for before the inverter is incorporated to the electrical network according to the electrical network
Voltage and the output voltage generate one first and compensate phase place, and according to the electrical network after the inverter is incorporated to the electrical network
Voltage and the electric current generate one second and compensate phase place；And a deaccentuator, with the mains frequency generative circuit and
The phase compensating circuit is connected, for before the inverter is connected to the grid according to the frequency of the line voltage and described the
One compensation phase place generates the setting frequency values, and after the inverter is connected to the grid according to the frequency of the line voltage and
The second compensation phase place generates the setting frequency values.
By said structure, frequency can be corrected, so as to relatively accurately by the circuit structure of phase compensation
Output arranges frequency values, so that control device for inverter can better control over inverter.
In a schematic embodiment of control circuit, the phase compensating circuit includes：One first phase is mended
Circuit is repaid, is connected with the input block, for first compensation being generated according to the line voltage and the output voltage
Phase place；One second phase compensation circuit, is connected with the input block, for according to the line voltage and the power network current
Generate the second compensation phase place；And one first switching device, with the first phase compensation circuit and the second phase
Compensation circuit selectivity is connected, for enabling the first phase compensation circuit before the inverter is incorporated to the electrical network,
And the second phase compensation circuit is enabled after the inverter is incorporated to the electrical network.
Before inverter is connected to the grid and after being connected to the grid, by the first switching device, different parameters are utilized respectively
Generate and magnitude of voltage is set and frequency values are set, so as to precisely control inverter, and inverter is also avoid because which is defeated
Go out voltage different with line voltage and be damaged.
In a schematic embodiment of control circuit, first switching device is compensated in the first phase
Electric circuit inspection to the phase place of the output voltage it is different with the phase place of the line voltage when, keep and the first phase compensation
The connection of circuit；The phase place of the output voltage and the phase place of the line voltage is detected in the first phase compensation circuit
When identical, be triggered the connection disconnected with the first phase compensation circuit, and switches to the second phase compensation circuit.
By said structure, when output voltage is different with the phase place of line voltage, the first switching device keeps and first
The connection of phase compensating circuit, carries out phase compensation using line voltage and output voltage, and circular modulating is up to output voltage
Phase place is identical with the phase place of line voltage, and in the phase place of output voltage and the identical phase place of line voltage, automatically switches to
Second phase compensation circuit, carries out phase compensation using line voltage and power network current, until the phase place of line voltage and electrical network
The phase place of electric current is identical, so that operation more automatization, and precisely control inverter.
In a schematic embodiment of control circuit, the first phase compensation circuit includes：One first phase
Position detection circuit, for according to the line voltage, the output voltage and the clock signal, determine the output voltage and
First phase between the line voltage is poor, to determine whether the phase place of the output voltage is ahead of the line voltage
Phase place；And a first adder, it is connected with first phase detection circuit, it is advanced for the phase place in the output voltage
In the case of the phase place of the line voltage, the first adder last the first compensation phase place for generating is deducted default
One first step value to generate the first compensation phase place, and the phase place in the output voltage lags behind the line voltage
Phase place in the case of, the first adder last the first compensation phase place for generating is added into default first stepping
Value compensates phase place to generate described first.
By said structure, according to default first step value, the phase contrast between line voltage and output voltage and
Last the first compensation phase place for generating is simple and accurately generate this first compensation phase place to correct frequency.
In a schematic embodiment of control circuit, the second phase compensation circuit includes：One second phase
Position detection circuit, for according to the line voltage, the power network current and the clock signal, determine the power network current and
Second phase between the line voltage is poor, to determine whether the phase place of the power network current is ahead of the line voltage
Phase place；And second adder, it is connected with second phase detection circuit, for being ahead of in the phase place of the power network current
In the case of the phase place of the line voltage, the second adder last the second compensation phase place for generating is deducted default
One second step value is to generate the second compensation phase place, and the phase place in the power network current lags behind the line voltage
In the case of phase place, the second adder last the second compensation phase place for generating is added into default second step value
To generate the second compensation phase place.
By said structure, according to default second step value, the phase contrast between line voltage and power network current and
Last the second compensation phase place for generating is simple and accurately generate this second compensation phase place to correct frequency.
In a schematic embodiment of control circuit, the input block includes：One first comparison circuit, institute
The first comparison circuit is stated with a first input end, one second input and one first outfan, the first input end is used for
It is input into the line voltage, second input end grounding, first outfan and first circuit and described second electric
Road connects, for exporting the line voltage of positive half cycle waveform；One second comparison circuit, second comparison circuit have one
3rd input, one the 4th input and one second outfan, the 3rd input are used for being input into the output voltage, described
4th input end grounding, second outfan are connected with first circuit, for exporting the output of positive half cycle waveform
Voltage；And one the 3rd comparison circuit, the 3rd comparison circuit has one the 5th input, one the 6th input and the 3rd
Outfan, the 5th input are used for being input into the power network current, the 6th input end grounding, the 3rd outfan with
First circuit and second circuit connection, for exporting the power network current of positive half cycle waveform.
By said structure, the output voltage of the line voltage of sine wave, power network current and inverter is just processed as
The signal of half cycle waveform, so that follow-up signal processing is simpler.
In a schematic embodiment of control circuit, the second circuit includes：One second switching device, with
The input block is connected, and accesses the line voltage for the selectivity before the inverter is incorporated to the electrical network, and in institute
State selectivity after inverter is incorporated to the electrical network and access the power network current；And an amplitude calculating circuit, cut with described second
Changing device is connected, and the line voltage or the power network current for being accessed according to the second switching device selectivity is generated
The setting magnitude of voltage.
By said structure, before inverter is connected to the grid and after being connected to the grid, different Parameter Modulations are respectively adopted, from
And more accurately generate setting magnitude of voltage.
According to the other side of this utility model embodiment, there is provided inverter control system, including：One control dress
Put, for controlling an inverter；And the control circuit described in any of the above-described scheme, it is connected with control device, for institute
The control device output setting frequency values and the setting magnitude of voltage is stated, wherein, the control device arranges frequency according to described
Rate value and the setting magnitude of voltage control the inverter.
By said structure, without the need for the human-computer interaction interface needed for prior art, without loaded down with trivial details inverter again
Design, control circuit directly can be connected the control for being capable of achieving inverter with the control device of inverter, and design is simple simultaneously
And possess wide applicability.
According to the other side of this utility model embodiment, there is provided inverter system, including：One inverter；One
Control device, is connected with the inverter, for controlling the inverter；Control circuit described in any of the above-described scheme, with
Control device is connected, for the control device output setting frequency values and the setting magnitude of voltage；Wherein, the control
Device processed controls the inverter according to the setting frequency values and the setting magnitude of voltage.
By said structure, do not change the existing structure of the control device of inverter, and by being connected with control device
Control circuit is generating setting magnitude of voltage needed for control device and arrange electric current, and it is inverse to be further advanced by control device control
Become device, the control device design comparison for solving inverter in correlation technique is complicated, cost is higher, the suitability is poor asks
Topic, and then reached simple design, low cost and possessed the effect of wide applicability.
In a schematic embodiment of inverter system, the inverter system also includes a Current Mutual Inductance
Device, one end of the current transformer are connected between the inverter and the electrical network, the other end of the current transformer
It is connected with the control circuit, for gathering the power network current, and the power network current is input into the control circuit；One
First voltage transformer, one end of the first voltage transformer are connected between the inverter and the electrical network, and described
The other end of one voltage transformer is connected with the control circuit, for gathering the line voltage, and by the line voltage
It is input into the control circuit；And a second voltage transformer, one end of the second voltage transformer is connected to described inverse
Become between device and the electrical network, the other end of the second voltage transformer is connected with the control circuit, it is described for gathering
Output voltage, and the output voltage is input into the control circuit.
By said structure, output voltage, power network current and the line voltage of inverter can be gathered, so as to for inverter
System generates and arranges magnitude of voltage and arrange the parameter needed for current value is provided.
By this utility model, as the first circuit utilizes the defeated of line voltage and inverter before inverter is connected to the grid
Go out voltage to generate setting frequency values, generate setting frequency using line voltage and power network current after inverter is connected to the grid
Value, second circuit generates setting magnitude of voltage using line voltage before inverter is connected to the grid, after inverter is connected to the grid,
Setting magnitude of voltage is generated using power network current, therefore, the control device design comparison for solving inverter in correlation technique is multiple
Miscellaneous, cost is higher, the problem that the suitability is poor, and then has reached design simply and possessed the effect of wide applicability
Really.
Description of the drawings
Accompanying drawing described herein is used for providing further understanding to of the present utility model, constitutes of the present utility model one
Point, exemplary embodiment of the present utility model and its illustrate, for explaining this utility model, not constituting to this utility model
Improper restriction.In the accompanying drawings：
Fig. 1 is the exemplary topology diagram of the inverter system for motor according to correlation technique；
Fig. 2 is the topological diagram of the inverter system for photovoltaic application according to this utility model embodiment；
Fig. 3 is the structured flowchart of the inverter system according to this utility model embodiment；And
Fig. 4 is the structured flowchart of the inverter control system according to this utility model embodiment；
Fig. 5 is the structured flowchart one of the control circuit according to this utility model embodiment；
Fig. 6 is the structured flowchart two of the control circuit according to this utility model embodiment；
Fig. 7 is the structured flowchart three of the control circuit according to this utility model embodiment；
Fig. 8 is the structured flowchart four of the control circuit according to this utility model embodiment；
Fig. 9 is the structured flowchart five of the control circuit according to this utility model embodiment；
Figure 10 is the structured flowchart six of the control circuit according to this utility model embodiment；
Figure 11 is the structured flowchart seven of the control circuit according to this utility model embodiment；
Figure 12 is the topological diagram of the control circuit according to this utility model embodiment；
Reference markss table is as follows：2nd, inverter；4th, control device；6th, control circuit；5th, inverter control system；7th, inversion
Device system；8th, electrical network；10th, input block；102nd, the first comparison circuit；104th, the second comparison circuit；106th, the 3rd comparison circuit；
12nd, insulated gate bipolar transistor；14th, ac/dc commutator；20th, the first circuit；22nd, mains frequency generative circuit；24、
Phase compensating circuit；242nd, first phase compensation circuit；2422nd, first phase detection circuit；2424th, first adder；244、
Second phase compensation circuit；2442nd, second phase detection circuit；2444th, second adder；246th, the first switching device；26th, frequency
Rate correcting circuit；30th, second circuit；302nd, the second switching device；304th, amplitude calculating circuit；40th, output unit；It is HMI, man-machine
Interactive interface；M, motor；PV, photovoltaic；CDC, electric capacity；CT, current transformer；VT1, first voltage transformer；VT2, second voltage
Transformer；I, power network current；Us, line voltage；Ui, output voltage；L11-L13, inductance；L1-L3, phase voltage；Clk, clock letter
Number；△ θ 1, first compensate phase place；△ θ 2, second compensate phase place.
Specific embodiment
Below with reference to accompanying drawing and in conjunction with the embodiments describing this utility model in detail.It should be noted that not rushing
In the case of prominent, the feature in embodiment and embodiment in this utility model can be mutually combined.
It should be noted that specification and claims of the present utility model and the term " first " in above-mentioned accompanying drawing,
" second " etc. is for distinguishing similar object, without being used for describing specific order or precedence.
In illustrative embodiments of the present utility model, there is provided for realizing in the connection application of photovoltaic electrical network
The system of the standard inverters for using.
With the combination of the development of photovoltaic technology, inverter and photovoltaic technology it is more and more extensive.For environmental protection and
The crisis for preventing the renewable sources of energy exhausted, solar energy are increasingly received and are used as the center type or distributed energy of electric power.It is real
The generating of existing solar energy is usually used the photovoltaic technology for converting light energy into the electric energy with DC voltage.In order to by the unidirectional current
AC network is connected to, needs unidirectional current is converted to the transducer of alternating current, i.e. inverter.Due to potential huge city
, in photovoltaic system, applied customization will be benefited for motor-driven inverter.
Fig. 2 is the topology of the inverter system for photovoltaic application according to illustrative embodiments of the present utility model
Figure.In the illustrative embodiments, line voltage Us, power network current I and inverter output voltage UiAs control circuit
6 input.It should be understood that the output voltage U of inverteriThe harmonic wave around switching frequency can be removed by low-pass filtering.
As shown in Fig. 2 the inverter system includes inverter 2, control device 4,6, three inductance L11- of control circuit
L13, photovoltaic PV, ac/dc commutator 14, Current Transmit, first voltage transformer VT1 and second voltage transformer
VT2, wherein, control device 4 includes six insulated gate bipolar transistors 12.In a schematic embodiment, control
Circuit 6 is functional interfaces module.
Ac/dc commutator 14 is converted to direct current for the three-phase alternating current (phase voltage is L1, L2 and L3) by input
Electricity.The unidirectional current of the output of ac/dc commutator 14 is used for electric power standby.In another schematic embodiment, should
Inverter system does not include ac/dc commutator 14.
Photovoltaic PV is used for converting the solar into unidirectional current.
Electric capacity CDCFor filtering the unidirectional current of ac/dc commutator 14 or photovoltaic PV outputs.
One end of Current Transmit is connected between inverter 2 and electrical network 8, and the other end is connected with control circuit 6, is used for
Collection power network current I, and power network current I is input into control circuit 6；One end of first voltage transformer VT1 is connected to inversion
Between device 2 and electrical network 8, the other end is connected with control circuit 6, for gathering line voltage Us, and by line voltage UsIt is input into control
Circuit processed 6；One end of second voltage transformer VT2 is connected between inverter 2 and electrical network 8, and the other end is connected with control circuit 6
Connect, for gathering the output voltage U of inverteri, and by output voltage UiIt is input into control circuit 6.
Inductance L11-L13 is for the output voltage U to inverter 2iIt is filtered.
Control circuit 6 is connected to the grid before 8 in inverter 2, according to the line voltage U of inputsWith output voltage UiGenerate and arrange
Frequency values, according to line voltage UsGenerate and magnitude of voltage is set, and be connected to the grid after 8 in inverter, according to the line voltage U of inputs
Generate with the power network current I of input and frequency values are set, generated according to power network current I and magnitude of voltage is set.Control circuit 6 by generate
Frequency values are set and magnitude of voltage is set and export to control device 4.
Control device 4 is brilliant according to the insulated gate bipolar for arranging magnitude of voltage and setting current value control inverter 2 of input
The on off state of body pipe 12.
The illustrative embodiments without the need for the human-computer interaction interface needed for prior art, without loaded down with trivial details inverter 2
Redesign, control circuit 6 directly can be connected with control device 4 control for being capable of achieving inverter 2, design simply and
Possesses wide applicability.
The concrete structure of the control circuit 6 in present embodiment will become clear from the description below, and here is omitted.
It is of the present utility model embodiment further provides an inverter control system.Fig. 3 is implemented according to this utility model
The structured flowchart of the inverter system of mode, as shown in figure 3, the inverter system 7 includes inverter 2, control device 4 and control
Circuit 6.Wherein, control device 4 is connected with inverter 2, for controlling inverter 2；Control circuit 6 is connected with control device 4, is used
In arranging magnitude of voltage to the output of control device 4 and arranging frequency values, so that control device 4 is according to setting magnitude of voltage and arranges frequency
Modulus control inverter 2.Wherein, the concrete structure of the control circuit 6 in present embodiment will become clear from the description below, this
Place repeats no more.
It is of the present utility model embodiment further provides an inverter control system.Fig. 4 is implemented according to this utility model
The structured flowchart of the inverter control system of mode, as shown in figure 4, the inverter control system 5 includes control device 4 and control
Circuit 6, wherein, control circuit 6 is connected with control device 4, is exported to control dress for arranging magnitude of voltage and arranging frequency values
4 are put, so that control device 4 is controlled to inverter according to the setting magnitude of voltage and setting frequency values of input.Wherein, this reality
The concrete structure for applying the control circuit 6 in mode will become clear from the description below, and here is omitted.
By said structure so that the control circuit 6 being connected with control device 4 can adaptively obtain control device 4
Required setting magnitude of voltage and setting electric current, without the need for be arranged by human-computer interaction interface input voltage and frequency configuration, without
It is loaded down with trivial details and limitedly redesign inverter circuit.
Illustrative embodiments of the present utility model additionally provide a control circuit, and Fig. 5 is implemented according to this utility model
The structured flowchart one of the control circuit of mode.As shown in figure 5, the control circuit 6 include input block 10, the first circuit 20,
Two circuits 30 and output unit 40.Wherein, input block 10 is used for being input into the output voltage U of inverteri, line voltage UsAnd electricity
Net electric current I, wherein, line voltage UsIt is the voltage of electrical network, power network current I is the electric current of electrical network.First circuit 20 is single with input
Unit 10 be connected, for before inverter is connected to the grid according to line voltage UsWith output voltage UiGenerate and frequency values are set, and inverse
Become after device is connected to the grid according to line voltage UsGenerate with power network current I and frequency values are set.Second circuit 30 and input block 10
Be connected, for before inverter is connected to the grid according to line voltage UsGenerate and magnitude of voltage is set, and after inverter is connected to the grid
Generated according to power network current I and magnitude of voltage is set.Output unit 40 is connected with the first circuit 20 and second circuit 30, for inversion
The control device output of device arranges frequency values and arranges magnitude of voltage, so that control device is according to the setting frequency values being input into and sets
Put magnitude of voltage control inverter.
By said structure, the control device design comparison that solves inverter in correlation technique is complicated, cost is higher,
The poor problem of the suitability, and then reached simple design, low cost and possessed the effect of wide applicability.
In another illustrative embodiments of the present utility model, a control circuit is additionally provided.Fig. 6 is according to this
The structured flowchart two of the control circuit of utility model embodiment.As shown in fig. 6, the control circuit 6 is except including shown in Fig. 5
Outside various circuit structures, its first circuit 20 includes mains frequency generative circuit 22, phase compensating circuit 24 and frequency correction electricity
Road 26.Wherein, mains frequency generative circuit 22 is connected with input block 10, for according to clock signal and line voltage UsGenerate
Line voltage UsFrequency.Phase compensating circuit 24 is connected with input block 10, for before inverter is connected to the grid according to electricity
Net voltage UsWith output voltage UiGenerate first and compensate phase place, and according to line voltage U after inverter is connected to the gridsAnd electric current
UiGenerate second and compensate phase place.Deaccentuator 26 is connected with mains frequency generative circuit 22 and phase compensating circuit 24, is used
According to line voltage U before being connected to the grid in invertersFrequency and the first compensation phase place generate and frequency values be set, and in inversion
Device be connected to the grid after according to line voltage UsFrequency and second compensation phase place generate arrange frequency values.In an exemplary enforcement
In mode, the frequency values of clock signal are default, and which is greater than line voltage UsFrequency, power network current I and inverter
Output voltage UiAny value.
By said structure, frequency can be corrected, so as to relatively accurately by the circuit structure of phase compensation
Output arranges frequency values, so that control device for inverter can better control over inverter.
But, the structure of the first circuit 20 is not limited to this, for example, the first circuit 20 be include phase detecting circuit and with
The frequency compensated circuit that phase detecting circuit is connected, wherein, phase detecting circuit is used for detecting phase place and the inversion of line voltage
Phase contrast between the phase place of the output voltage of device, the phase contrast are used for indicating whether the phase place of output voltage is ahead of electrical network electricity
The phase place of pressure.In the case where the phase place of the output voltage of inverter lags behind the phase place of line voltage, frequency compensated circuit will
The frequency of line voltage increases a step value, and using the frequency of the line voltage increased after step value as inverter setting
Frequency values；In the case where the phase place of the output voltage of inverter is ahead of the phase place of line voltage, frequency compensated circuit is by electricity
The frequency of net voltage deducts a step value, and will deduct the setting frequency of the frequency of the line voltage after step value as inverter
Rate value.
Other circuit structures in present embodiment are identical with the circuit structure of the control circuit with reference to described by Fig. 5, this
Place repeats no more.
In another illustrative embodiments of the present utility model, phase compensating circuit 24 is as shown in fig. 7, comprises first
Phase compensating circuit 242, second phase compensation circuit 244 and the first switching device 246.Wherein, first phase compensation circuit 242
It is connected with input block 10, for according to line voltage UsWith output voltage UiGenerate first and compensate phase place；Second phase compensation electricity
Road 244, is connected with input block 10, for according to line voltage UsSecond is generated with power network current I and compensates phase place；And first
Switching device 246, is connected with first phase compensation circuit 242 and 244 selectivity of second phase compensation circuit, in inverter
First phase compensation circuit 242 is enabled before being connected to the grid, and enables second phase compensation after inverter is connected to the grid
Circuit 244.
Wherein, the first switching device 246 detects output voltage U in first phase compensation circuit 242iPhase place and electrical network
Voltage UsPhase place it is different when, keep the connection with first phase compensation circuit 242；Detect in first phase compensation circuit 242
To output voltage UiPhase place and line voltage UsPhase place it is identical when, be triggered and disconnect and the company of first phase compensation circuit 242
Connect, and switch to second phase compensation circuit 244.
By said structure, before inverter is connected to the grid, the first switching device 246 enables first phase compensation circuit
242, will first phase compensation circuit 242 connect with deaccentuator 26, so as to according to line voltage UsWith inverter
Output voltage UiGenerate first and compensate phase place, to line voltage UsFrequency be corrected, generate arrange frequency values.Circulation is above-mentioned
Process, until line voltage UsPhase place and inverter output voltage UiPhase place it is identical, and in line voltage UsPhase place and
The output voltage U of inverteriPhase place it is identical when, triggering inverter is connected to the grid, and triggers the first switching device 246 and being switched to
Second phase compensation circuit 244, will second phase compensation circuit 244 connect with deaccentuator 26, so as to according to electrical network
Voltage UsSecond is generated with power network current I and compensates phase place, the frequency of power network current I is corrected, generated and frequency values are set.It is logical
Such structure is crossed, before inverter is connected to the grid and after being connected to the grid, is utilized respectively different parameters to generate setting voltage
Value and setting frequency values, precisely control inverter, and also avoid inverter because its output voltage UiWith line voltage Us
It is different and be damaged.
Other circuit structures in this illustrative embodiments and the circuit structure phase with reference to the control circuit described by Fig. 6
Together, here is omitted.
In another illustrative embodiments of the present utility model, first phase compensation circuit 242 is as shown in figure 8, bag
Include first phase detection circuit 2422 and first adder 2424.Wherein, first phase detects circuit 2422 for according to electrical network
Voltage Us, output voltage UiAnd clock signal, determine output voltage UiWith line voltage UsBetween first phase it is poor, with determine
Output voltage UiPhase place whether be ahead of line voltage UsPhase place.First adder 2424 detects circuit with first phase
2422 are connected, in output voltage UiPhase place be ahead of line voltage UsPhase place in the case of, by first adder 2424
Last the first compensation phase place for generating deducts default first step value to generate the first compensation phase place, and in output voltage Ui
Phase place lag behind line voltage UsPhase place in the case of, by first adder 2424 last the first compensation phase place for generating
Plus default first step value generating the first compensation phase place.
In another exemplary enforcement of the present utility model, second phase compensation circuit 244 is as shown in figure 9, including
Two phase detects circuit 2442 and second adder 2444.Wherein, second phase detects circuit 2442 for according to line voltage
Us, power network current I and clock signal, determine power network current I and line voltage UsBetween second phase it is poor, with determine electrical network electricity
Whether the phase place of stream I is ahead of line voltage UsPhase place.Second adder 2444 is connected with second phase detection circuit 2442,
For being ahead of line voltage U in the phase place of power network current IsPhase place in the case of, will be second adder 2444 last raw
Into second compensation phase place deduct default second step value to generate the second compensation phase place, and in the phase steric retardation of power network current I
After line voltage UsPhase place in the case of, by second adder 2444 last the second compensation phase place for generating plus default
The second step value generating the second compensation phase place.
The structure of above-mentioned first phase compensation circuit 242 and second phase compensation circuit 244 is exemplary circuit structure,
But it is not limited to said structure.In other implementations, first phase compensation circuit 242, second phase compensation circuit 244
It is integrated in a compensation circuit with the first switching device 246 and realizes.For example, by line voltage, power network current and inverter
Output voltage is separately input to compensation circuit.Before being connected to the grid due to inverter, the electric current of electrical network is zero ampere, therefore, mend
It is zero ampere-hour that circuit is repaid in the electric current for detecting electrical network, carries out phase compensation according to line voltage and inverter output voltage,
And compensation phase place is exported, and the frequency of line voltage is corrected, and the frequency of the line voltage after correction is defeated as frequency values are arranged
Go out.Compensation circuit is constantly circulated detection, when the phase place for detecting line voltage is identical with the phase place of power network current, inverse
Change device is triggered and is connected to the grid, and hereafter, carries out phase compensation using power network current and line voltage and generates setting frequency values.
In addition, the first step value, the second step value, the initial value of last the first compensation phase place for generating and last time
The initial value of the second compensation phase place for generating all is default value.Those skilled in the art can be set according to practical situation
Put.
Other circuit structures of control circuit shown in Fig. 8 and Fig. 9 are tied with the circuit with reference to the control circuit described by Fig. 7
Structure is identical, and here is omitted.
It is of the present utility model another embodiment further provides a control circuit, Figure 10 is implemented according to this utility model
The structured flowchart six of the control circuit of mode.As shown in Figure 10, input block 10 also includes：First comparison circuit 102, second compares
Compared with circuit 104 and the 3rd comparison circuit 106.
First comparison circuit 102 has first input end, the second input and the first outfan.Wherein, first input end
For being input into line voltage Us, the second input end grounding, the first outfan are connected with the first circuit 20 and second circuit 30, are used for
Export the line voltage U of positive half cycle waveforms.In another illustrative embodiments, the first output of the first comparison circuit 102
End is electric with mains frequency generative circuit 22, first phase detection circuit 2422, second phase detection circuit 2442 and second respectively
The input on road 30 is connected.The line voltage U that first comparison circuit 102 will be input intosThe line voltage of positive half cycle waveform is converted into,
And exported to mains frequency generative circuit 22, first phase detection circuit 2422, second phase detection electricity by the first outfan
Road 2442 and second circuit 30, the line voltage of the positive half cycle waveform is except as mains frequency generative circuit 22, the first phase
Outside the input data of position detection circuit 2422, second phase detection circuit 2442 and second circuit 30, enable electrical network is also served as
The enable letter of frequency generation circuit 22, first phase detection circuit 2422, second phase detection circuit 2442 and second circuit 30
Number.
Second comparison circuit 104 has the 3rd input, the 4th input and the second outfan, wherein, the 3rd input
For input and output voltage Ui, the 4th input end grounding, the second outfan are connected with the first circuit 20, for exporting positive half cycles
The output voltage U of shapei.In another exemplary embodiment, the second outfan detects circuit 2422 with first phase
Input is connected.Second comparison circuit 104 is for the output voltage of the inverter of input to be converted to the inversion of positive half cycle waveform
Device output voltage.
3rd comparison circuit 106 has the 5th input, the 6th input and the 3rd outfan.Wherein, the 5th input
For being input into power network current I, the 6th input end grounding, the 3rd outfan are connected with the first circuit 20 and second circuit 30, are used for
Export the power network current I of positive half cycle waveform.In another exemplary embodiment, the 3rd outfan respectively with second phase
Detection circuit 2442 is connected with second circuit 30.
Wherein, the major function of the first comparison circuit 102, the second comparison circuit 104 and the 3rd comparison circuit 106 is difference
To the line voltage U being input intos, inverter output voltage UiWith power network current I process, to obtain easy-to-handle number
According to pattern.Wherein, positive half cycle waveform is the square-wave waveform of positive half cycle, or the sine waveform of positive half cycle.
Other circuit structures in present embodiment are identical with the circuit structure of the control circuit with reference to described by Fig. 8, its
In, its 244 control circuit as shown in Figure 9 of second phase compensation circuit detects circuit 2442 and second including second phase
Adder 2444.
Another illustrative embodiments of the present utility model additionally provide a control circuit, and Figure 11 is new according to this practicality
The structured flowchart seven of the control circuit of type embodiment.As shown in figure 11, the control circuit 6 is except all electricity included shown in Fig. 5
Outside line structure, its second circuit 30 includes the second switching device 302 and amplitude calculating circuit 304.
Wherein, the second switching device 302 is connected with input block 10, is accessed for the selectivity before inverter is connected to the grid
Line voltage Us, and selectivity accesses power network current I after inverter is connected to the grid.Specifically, it is connected to the grid in inverter
Before, that is, the power network current being input into is zero ampere-hour, will input line voltage UsInput be communicated to amplitude calculating circuit 304,
And after inverter is connected to the grid, the input of input power network current I is communicated to into amplitude calculating circuit 304.
Amplitude calculating circuit 304 is connected with the second switching device 302, for being connect according to 302 selectivity of the second switching device
The line voltage U for enteringsOr power network current I is generated and is arranged magnitude of voltage.
Certainly, second circuit 30 is not limited in said structure.In other implementations, second circuit 30 only includes
Amplitude calculating circuit, the amplitude calculating circuit are zero ampere-hour power network current is detected, according to line voltage calculating and setting electricity
Pressure value, and trigger inverter and be connected to the grid.After inverter is connected to the grid, i.e., when power network current is non-zero, according to electrical network electricity
Stream is generated and arranges magnitude of voltage.
The circuit structure phase of other circuit structures in this illustrative embodiments and the control circuit shown in Fig. 6 to Figure 10
Together, each circuit structure of the control circuit or shown in Fig. 6 to Figure 10 is mutually combined.
Illustrative embodiments of the present utility model additionally provide a control circuit, and Figure 12 is according to this utility model
The topological diagram of the control circuit of embodiment.Describe in detail according to illustrative embodiments of the present utility model below with reference to Figure 12
Control circuit.
As shown in figure 12, the control circuit includes：First comparison circuit 102, the second comparison circuit the 104, the 3rd compare electric
Road 106, mains frequency generative circuit 22, deaccentuator 26, first phase detection circuit 2422, first adder 2424,
Second phase detection circuit 2442, second adder 2444, the first switching device 246, the second switching device 302 and amplitude are calculated
Circuit 304.
First comparison circuit 102 has first input end, the second input and the first outfan, and wherein first input end is used
In access line voltage Us, the second input end grounding, the first outfan are examined with mains frequency generative circuit 22, first phase respectively
Slowdown monitoring circuit 2422, second phase detection circuit 2442 is connected with the second switching device 302, for exporting (the example of positive half cycle waveform
As positive half cycle sine wave) line voltage Us.The line voltage U of square waveformsExcept as mains frequency generative circuit 22,
One phase detecting circuit 2422, second phase is detected outside the input of circuit 2442 and the second switching device 302, also as above-mentioned
The enable signal of these circuits.
Second comparison circuit 104 has the 3rd input, the 4th input and the second outfan, wherein, the 3rd input
For being input into the output voltage U of inverteri, the 4th input end grounding, the second outfan detect circuit 2422 with first phase
Input is connected.
3rd comparison circuit 106 has the 5th input, the 6th input and the 3rd outfan, and the 5th input is used for defeated
Enter power network current I, the 6th input end grounding, the 3rd outfan second phase detection 302 phase of circuit 2442 and the second switching device
Even.3rd comparison circuit 106 is used for exporting the power network current I of positive half cycle waveform (such as the sine wave of positive half cycle).
Mains frequency generative circuit 22 has two inputs and an outfan, and wherein, an input is used for and the
First outfan of one comparison circuit 102 is connected, and another input is used for incoming clock signal Clk, its outfan and frequency
Correcting circuit 26 is connected.Line voltage U of the mains frequency generative circuit 22 according to inputsWith clock signal Clk, electrical network is calculated
Voltage UsFrequency, and exported to deaccentuator 26 by outfan.In a schematic embodiment, electrical network frequency
Rate generative circuit 22 is made up of enumerator and latch.
First phase detects circuit 2422, with three inputs, respectively with clock signal Clk, the first comparison circuit 102
The first outfan and the second comparison circuit 104 the second outfan be connected, for according to receive clock signal Clk, electrical network
Voltage UsWith the output voltage U of inverteriRelatively line voltage UsWith the output voltage U of inverteriBetween phase contrast, and will
The phase contrast for obtaining is exported to first adder 2424.Wherein, phase contrast herein is used for indicating the output voltage U of inverteri
Phase place still lag behind line voltage U in advancesPhase place, i.e. polarity.
The input of first adder 2424 detects outfan and the first end phase of circuit 2422 respectively with first phase
Even, wherein, first end is used for exporting the first compensation phase place △ θ 1 of the output of last first adder 2424.Specifically,
Output voltage U of one adder 2424 in inverteriPhase place be ahead of line voltage UsPhase place in the case of, by the last time
The the first compensation phase place △ θ 1 for generating deducts default first stepping and is worth to the first compensation phase place；In the output voltage of inverter
UiPhase place lag behind line voltage UsPhase place in the case of, by last the first compensation phase place △ θ 1 for generating plus default
The first stepping be worth to the first compensation phase place.Wherein, the first step value, the initial value of last the first compensation phase place for generating
It is default constant.
Second phase detects circuit 2442, with three inputs, respectively with clock signal Clk, the first comparison circuit 102
The first outfan and the 3rd comparison circuit 106 the 3rd outfan be connected, for according to receive clock signal Clk, electrical network
Electric current I and line voltage UsRelatively line voltage UsAnd the phase contrast between power network current I, and by the phase contrast for obtaining export to
Second adder 2444.Phase contrast herein is used for indicating that the phase place of power network current I still lags behind line voltage U in advances's
Phase place, i.e. polarity.
The input of second adder 2444 detects outfan and the second end phase of circuit 2442 respectively with second phase
Even, wherein, the second end is used for exporting the second compensation phase place △ θ 2 of the output of last second adder 2444.Second adder
2444 are ahead of line voltage U in the phase place of power network current IsPhase place in the case of, by last the second compensation phase for generating
Position △ θ 2 deduct default second stepping and are worth to the second compensation phase place；Line voltage U is lagged behind in the phase place of power network current Is
Phase place in the case of, last the second compensation phase place △ θ 2 for generating is worth to into the second compensation plus default second stepping
Phase place.Wherein, the initial value of the second step value and last the second compensation phase place △ θ 2 for generating is default constant.
First switching device 246, with two inputs and an outfan, can between two inputs selectivity
Ground switching connection, the input of selection is connected with its outfan, and wherein, two input is respectively connecting to the first addition
The outfan of the outfan of device 2424 and second adder 2444.In the output voltage U of inverteriPhase place and line voltage Us
Phase place it is identical when, the first switching device 246 is triggered and enable (disable) first adder 2424 enables the second addition
Device 2444, wherein, the output voltage U of inverteriPhase place and line voltage UsPhase place be mutually all triggering inverter be connected to the grid
Condition.
One end of deaccentuator 26 is respectively connecting to the outfan of mains frequency generative circuit 22 and the first switching dress
246 outfan is put, for the line voltage U before inverter is connected to the grid according to inputsFrequency and first compensation phase place
Correction line voltage UsFrequency, and after inverter is connected to the grid according to input line voltage UsFrequency and second compensation
Phasing line voltage UsFrequency, and by the line voltage U after correctionsFrequency as inverter setting frequency values.
Second switching device 302, optionally the first outfan and the 3rd comparison circuit with the first comparison circuit 102
106 the 3rd outfan connection, for optionally by line voltage UsOr power network current I is input to amplitude calculating circuit 304.
The input of amplitude calculating circuit 304 is connected with the second switching device 302, for the electrical network being input into according to selectivity
Voltage UsOr power network current I calculating and setting magnitudes of voltage.
The arrangement of each element in the control circuit according to illustrative embodiments is specifically described in the above description.Under
Face will describe the concrete operating principle according to the control circuit of illustrative embodiments.
Before grid-connected inverters, the first comparison circuit 102 accesses line voltage Us, and using ground voltage as benchmark electricity
Pressure.Through the process of the first comparison circuit 102, line voltage UsSine wave higher than ground voltage (i.e. zero voltage) when,
It is output to mains frequency generative circuit 22.
Mains frequency generative circuit 22 is in line voltage UsSine wave when rising above zero, counting clock signal Clk
Cycle calculating line voltage UsFrequency, latch count value and send it to deaccentuator 26.
Second comparison circuit 104 is input into the output voltage U of inverteri, and using ground voltage as reference voltage.With above
Similarly, through the second comparison circuit 104, the output voltage U of inverteriIt is output when higher than ground voltage.
First phase detection circuit 2422 is by counting the output voltage U in inverteriRising edge before clock week
Phase, determine line voltage UsWith the output voltage U of inverteriPhase contrast.In the output voltage U of inverteriWith line voltage Us
After same phase, inverter is triggered the electrical network that be initially incorporated into.First phase detection circuit 2422 is by determining electricity
Net voltage UsIn rising edge when polarity determining the polarity of phase shift.
First adder 2424 generates current the according to the phase contrast of input and the first compensation phase place △ θ 1 of last time
One compensation phase place, and it is input to deaccentuator 26.Specifically, if the output voltage U of inverteriPrior to line voltage Us,
The last compensation phase place △ θ 1 for obtaining is deducted into the first step value using first adder 2424 then, and by the first switching dress
Phase place that 246 outputs obtain is put to deaccentuator 26.If the output voltage U of inverteriLag behind line voltage Us, then
Last the first compensation phase place △ θ 1 for obtaining is added into the first step value, and by the output of the first switching device 246 to frequency
Correcting circuit 26.
Deaccentuator 26 before inverter is connected to the grid, according to line voltage UsFrequency and first compensation phase place life
Into frequency values are arranged, after inverter is connected to the grid, according to line voltage UsFrequency and second compensation phase place generate arrange frequency
Rate value.
Modulation before circulation performs grid-connected inverters, the output voltage U of inverteriPhase place finally and line voltage
UsIt is identical.In the output voltage U of inverteriWith line voltage UsPhase place it is identical when, the first switching device 246 is by chain route the
Second phase detection circuit 2442 and second adder is switched on one phase detecting circuit 2422 and first adder 2424
On 2444.Meanwhile, inverter is triggered and is connected to the grid, Posterior circle perform inverter be connected to the grid after modulation.
There is load after being connected to the grid due to inverter, will be obtained using power network current I and frequency values are set and voltage is set
Value.Now, the method for obtaining setting frequency values using power network current I obtains the side for arranging frequency values before being connected to the grid with inverter
Method is similar to, and second phase detection circuit 2442 obtains the line voltage U of the output of the first comparison circuit 102sWith the 3rd comparison circuit
The power network current I of 106 outputs and clock signal Clk, and by line voltage UsPhase place compared with the phase place of power network current I
Compared with obtaining both phase contrasts, to determine whether the phase place of power network current I is ahead of line voltage UsPhase place.If electrical network
The phase place of electric current I is ahead of line voltage UsPhase place, then using second adder 2444 by the last power network current I for obtaining
Phase place (i.e. last the second compensation phase place for generating) △ θ 2 deduct the second stepping and be worth to this second compensation phase place, lock
Deposit and by the first switching device 246 by this obtain second compensation phase output to deaccentuator 26, frequency correction
Circuit 26 is using the second compensation phase place and line voltage UsFrequency be corrected after obtain arrange frequency values.If electrical network is electric
The phase place of stream I is later than line voltage UsPhase place, then using second adder 2444 by the phase of the last power network current I for obtaining
Position (i.e. last the second compensation phase place for generating) △ θ 2, plus this second compensation phase place is worth to the second stepping, are latched
And the second compensation phase output obtained this by the first switching device 246, to deaccentuator 26, frequency correction is electric
Road 26 is using the second compensation phase place and line voltage UsFrequency be corrected after obtain arranging frequency values, and frequency will be set
It is worth the control device by outfan output to inverter.Perform above-mentioned modulation through circulation, the phase place of power network current I finally with
Line voltage UsPhase place it is identical.
After inverter is connected to the grid, using line voltage UsDetermine with power network current I and frequency values are set, this is with inverter simultaneously
Calculating before entering electrical network differs only in line voltage UsAmplitude gradually can increase or decrease, until meeting electric current and setting
Put.
Second switching device 302 accesses line voltage U before inverter is connected to the grids, after inverter is connected to the grid,
Access power network current I.Amplitude calculating circuit 304 before inverter is connected to the grid, using line voltage UsGenerate and magnitude of voltage be set,
After inverter is connected to the grid, is generated using power network current I and magnitude of voltage is set.
As described above, embodiment of the present utility model is without the need for the Man Machine Interface needed for prior art, without numerous
The redesign of trivial inverter, control circuit is directly connected the control for being capable of achieving inverter, design letter with control device
List and possesses wide applicability.
Illustrative embodiments of the present utility model are the foregoing is only, this utility model is not limited to, it is right
For those skilled in the art, this utility model can have various modifications and variations.It is all it is of the present utility model spirit and
Within principle, any modification, equivalent substitution and improvements made etc. are should be included within protection domain of the present utility model.
Claims (11)
1. control circuit, arranges frequency values and for the control device output one to an inverter and arranges magnitude of voltage, and which is special
Levy and be, including：
One input block (10), for being input into an output voltage (U of the inverteri), a line voltage (Us) and electrical network electricity
Stream (I), wherein, the line voltage (Us) be an electrical network voltage, power network current (I) is the electric current of the electrical network；
One first circuit (20), is connected with the input block (10), for the basis before the inverter is incorporated to the electrical network
Line voltage (the Us) and the output voltage (Ui) the setting frequency values are generated, and the electricity is incorporated in the inverter
According to the line voltage (U after nets) and the power network current (I) generate the setting frequency values；
One second circuit (30), is connected with the input block (10), for the basis before the inverter is incorporated to the electrical network
Line voltage (the Us) the setting magnitude of voltage is generated, and according to electrical network electricity after the inverter is incorporated to the electrical network
Stream (I) generates the setting magnitude of voltage；And
One output unit (40), is connected with the first circuit (20) and the second circuit (30), for the inverter
The control device output setting frequency values and the setting magnitude of voltage.
2. control circuit according to claim 1, it is characterised in that the first circuit (20) include：
One mains frequency generative circuit (22), is connected with the input block (10), for according to a clock signal (Clk) and institute
State line voltage (Us) generate the line voltage (Us) frequency；
One phase compensating circuit (24), is connected with the input block (10), for before the inverter is incorporated to the electrical network
According to the line voltage (Us) and the output voltage (Ui) one first compensation phase place is generated, and institute is incorporated in the inverter
State after electrical network according to the line voltage (Us) and one second compensation phase place of the electric current (I) generation；And
One deaccentuator (26), is connected with mains frequency generative circuit (22) and the phase compensating circuit (24),
For before the inverter is connected to the grid according to the line voltage (Us) frequency and it is described first compensation phase place generate institute
Setting frequency values are stated, and according to the line voltage (U after the inverter is connected to the grids) frequency and it is described second compensation
Phase place generates the setting frequency values.
3. control circuit according to claim 2, it is characterised in that phase compensating circuit (24) include：
One first phase compensation circuit (242), is connected with the input block (10), for according to the line voltage (Us) and
Output voltage (the Ui) generate the first compensation phase place；
One second phase compensation circuit (244), is connected with the input block (10), for according to the line voltage (Us) and
Power network current (I) generates the second compensation phase place；And
One first switching device (246), with first phase compensation circuit (242) and the second phase compensation circuit
(244) selectivity is connected, for enabling the first phase compensation circuit before the inverter is incorporated to the electrical network
(242), and enable second phase compensation circuit (244) after the inverter is incorporated to the electrical network.
4. control circuit according to claim 3, it is characterised in that the first switching device (246) are described first
Phase compensating circuit (242) detects the output voltage (Ui) phase place and the line voltage (Us) phase place it is different when, protect
Hold the connection with first phase compensation circuit (242)；The output is detected in first phase compensation circuit (242)
Voltage (Ui) phase place and the line voltage (Us) phase place it is identical when, be triggered disconnection and the first phase compensation circuit
(242) connection, and switch to second phase compensation circuit (244).
5. control circuit according to claim 3, it is characterised in that first phase compensation circuit (242) include：
One first phase detection circuit (2422), for according to the line voltage (Us), the output voltage (Ui) and it is described when
Clock signal (Clk), determines the output voltage (Ui) and the line voltage (Us) between first phase it is poor, it is described to determine
Output voltage (Ui) phase place whether be ahead of the line voltage (Us) phase place；And
One first adder (2424), is connected with first phase detection circuit (2422), in the output voltage (Ui)
Phase place be ahead of the line voltage (Us) phase place in the case of, generate the first adder (2424) last
First compensation phase place deducts default 1 first step value to generate the first compensation phase place, and in the output voltage (Ui)
Phase place lag behind the line voltage (Us) phase place in the case of, generate the first adder (2424) last
First compensation phase place compensates phase place plus default first step value to generate described first.
6. control circuit according to claim 3, it is characterised in that second phase compensation circuit (244) include：
One second phase detection circuit (2442), for according to the line voltage (Us), the power network current (I) and it is described when
Clock signal (Clk), determines the power network current (I) and the line voltage (Us) between second phase it is poor, it is described to determine
Whether the phase place of power network current (I) is ahead of the line voltage (Us) phase place；And
Second adder (2444), is connected with second phase detection circuit (2442), in the power network current (I)
Phase place is ahead of the line voltage (Us) phase place in the case of, by it is the second adder (2444) last generate the
Two compensation phase places deduct default 1 second step value to generate the second compensation phase place, and in the power network current (I)
Phase place lags behind the line voltage (Us) phase place in the case of, by it is the second adder (2444) last generate the
Two compensation phase places compensate phase place plus default second step value to generate described second.
7. control circuit according to claim 1, it is characterised in that input block (10) include：
One first comparison circuit (102), described first comparison circuit (102) have a first input end, one second input and
One first outfan, the first input end are used for being input into the line voltage (Us), second input end grounding, described
One outfan is connected with the first circuit (20) and the second circuit (30), for exporting the electrical network of positive half cycle waveform
Voltage (Us)；
One second comparison circuit (104), described second comparison circuit (104) have one the 3rd input, one the 4th input and
One second outfan, the 3rd input are used for being input into the output voltage (Ui), the 4th input end grounding, described
Two outfans are connected with the first circuit (20), for exporting the output voltage (U of positive half cycle waveformi)；And
One the 3rd comparison circuit (106), the 3rd comparison circuit (106) have one the 5th input, one the 6th input and
One the 3rd outfan, the 5th input are used for being input into the power network current (I), the 6th input end grounding, and described the
Three outfans are connected with the first circuit (20) and the second circuit (30), for exporting the electrical network of positive half cycle waveform
Electric current (I).
8. control circuit according to any one of claim 1 to 7, it is characterised in that second circuit (30) include：
One second switching device (302), is connected with the input block (10), for before the inverter is incorporated to the electrical network
Selectivity accesses the line voltage (Us), and selectivity accesses the power network current after the inverter is incorporated to the electrical network
(I)；And
One amplitude calculating circuit (304), is connected with the second switching device (302), for according to second switching device
(302) line voltage (U that selectivity is accesseds) or the power network current (I) generate the setting magnitude of voltage.
9. inverter control system, it is characterised in that include：
One control device (4), for controlling an inverter；And
Control circuit (6) any one of claim 1 to 8, exports the setting frequency values to the control device (4)
With the setting magnitude of voltage；
Wherein, control device (4) control the inverter according to the setting frequency values and the setting magnitude of voltage.
10. inverter system, it is characterised in that include：
One inverter (2)；
One control device (4), is connected with the inverter (2), for controlling the inverter (2)；
Control circuit (6) any one of claim 1 to 8, is connected with the control device (4), for the control
Device (4) processed output setting frequency values and the setting magnitude of voltage；
Wherein, control device (4) control inverter (2) according to the setting frequency values and the setting magnitude of voltage.
11. inverter systems according to claim 10, it is characterised in that also include：
One current transformer (CT), the one end of current transformer (CT) are connected to the inverter (2) and the electrical network (8)
Between, the other end of current transformer (CT) is connected with the control circuit (6), for gathering the power network current (I),
And the power network current (I) is input into the control circuit (6)；
One first voltage transformer (VT1), the one end of first voltage transformer (VT1) be connected to the inverter (2) and
Between electrical network (8), the other end of first voltage transformer (VT1) is connected with the control circuit (6), for gathering
Line voltage (the Us), and by the line voltage (Us) be input into the control circuit (6)；And
One second voltage transformer (VT2), the one end of second voltage transformer (VT2) be connected to the inverter (2) and
Between electrical network (8), the other end of second voltage transformer (VT2) is connected with the control circuit (6), for gathering
Output voltage (the Ui), and by the output voltage (Ui) be input into the control circuit (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621094265.3U CN206041519U (en) | 2016-09-29 | 2016-09-29 | Control circuit , dc -to -ac converter control system and inverter system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621094265.3U CN206041519U (en) | 2016-09-29 | 2016-09-29 | Control circuit , dc -to -ac converter control system and inverter system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206041519U true CN206041519U (en) | 2017-03-22 |
Family
ID=58297064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621094265.3U Expired - Fee Related CN206041519U (en) | 2016-09-29 | 2016-09-29 | Control circuit , dc -to -ac converter control system and inverter system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206041519U (en) |
-
2016
- 2016-09-29 CN CN201621094265.3U patent/CN206041519U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102035423B (en) | Three-phase four-wire three-level photovoltaic grid-connected connection inverter and control method thereof | |
| CN201846091U (en) | Full numerical control three-phrase solar photovoltaic grid-connected inverter | |
| CN105140966B (en) | A kind of modulation strategy for suppressing non-isolation type photovoltaic system leakage current | |
| CN104104247B (en) | Method and apparatus for converting direct current/alternating current power of bridge type | |
| CN103904676B (en) | The droop control method of a kind of VSC-HVDC | |
| CN103023070B (en) | Hybrid-clamped three-electric-level three-phase four-wired photovoltaic system based on 3D-SPWM (three-dimensional sinusoidal pulse width modulation) | |
| CN105553310B (en) | A kind of low-key system control method of modularization multi-level converter | |
| CN106300435A (en) | Isolated microgrid single-phase multi-inverter parallel system and distributed control method thereof | |
| CN106130062B (en) | A kind of two-stage type grid-connected photovoltaic system and intermediate dc side voltage stabilizing method | |
| CN101938140A (en) | Distributed power supply system | |
| CN106451494B (en) | A kind of active damping control method based on current on line side feedback | |
| CN104052083A (en) | Grid connection inverter hybrid modulating device and method | |
| CN103515979A (en) | Low-cost single-phase integrated energy feedback system | |
| CN204205923U (en) | Wind-powered electricity generation Variable flow control system | |
| CN203103983U (en) | Hybrid-clamping type three-level three-phase four-wire photovoltaic system based on 3D-SPWM | |
| Khan et al. | DC-AC inverter with perspective of common mode and wave-shaping | |
| CN206041519U (en) | Control circuit , dc -to -ac converter control system and inverter system | |
| CN106059547A (en) | Dead-zone compensation method and device in PWM | |
| CN203456879U (en) | Low-cost single-phase integrated energy feedback system | |
| CN107579539A (en) | A kind of method for suppressing DC component in combining inverter grid current | |
| CN110336302A (en) | Light storage joint grid-connected system and its control method with virtual synchronous characteristic | |
| CN105680711A (en) | SHEPWM adopted T type three-level inverter neutral-point voltage balance control method | |
| CN103078348B (en) | No-signal interconnection line parallel-connection three-phase inverter and control method thereof | |
| CN202586867U (en) | Brushless double-fed motor control device | |
| CN105720795A (en) | Wind power conversion control system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170322 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |