CN106961123B - Control device of grid-connected inverter - Google Patents
Control device of grid-connected inverter Download PDFInfo
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- CN106961123B CN106961123B CN201710373031.5A CN201710373031A CN106961123B CN 106961123 B CN106961123 B CN 106961123B CN 201710373031 A CN201710373031 A CN 201710373031A CN 106961123 B CN106961123 B CN 106961123B
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- 238000001514 detection method Methods 0.000 claims abstract description 44
- 230000001939 inductive effect Effects 0.000 claims abstract description 29
- 238000005070 sampling Methods 0.000 claims abstract description 16
- 230000027311 M phase Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 9
- 238000001914 filtration Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
Abstract
The invention provides a control device of a grid-connected inverter, which generates reference current of each phase according to alternating current detection voltage and bus detection voltage through a reference unit; sampling each phase of inductive current through an inductive current sampling unit; the lower bridge arm voltage detection unit detects drain-source voltages of the lower bridge arm switching tubes of all phases and generates a comparison result of the corresponding phase drain-source voltages and a preset voltage; finally, when the corresponding phase inductance current is increased to the corresponding phase reference current through the driving unit, the corresponding phase switching tube is driven to be turned off; and when the drain-source voltage of the corresponding phase is reduced to a preset voltage, the corresponding phase of the switch tube is driven to be conducted. Because the preset voltage is a drain-source voltage value representing that the corresponding phase inductive current is zero, the control device of the grid-connected inverter finally realizes that the corresponding phase switching tube is driven to be switched off when the corresponding phase inductive current is increased to the corresponding phase reference current, and the corresponding phase switching tube is driven to be switched on when the corresponding phase inductive current is zero.
Description
Technical Field
The invention relates to the technical field of inversion control, in particular to a control device of a grid-connected inverter.
Background
FIG. 1 is a schematic diagram of a grid-connected photovoltaic interleaved parallel flyback inverter; the inverter part of the high-frequency full-bridge grid-connected inverter consists of a decoupling capacitor Cin, an interleaving parallel flyback circuit and a high-frequency full-bridge grid-connected inverter circuit. The interleaving parallel flyback circuit is formed by connecting two identical flyback circuits in parallel, and each flyback circuit mainly comprises a primary side switching tube SM1And SM2Transformers T1 and T2, and flyback diodes D1 and D2. The output of the flyback current is controlled by a switch tube SM1And SM2Is determined by the control of (2). The high-frequency full-bridge grid-connected inverter circuit comprises a full bridge consisting of four switching tubes Smos1, Smos2, Smos3 and Smos4, filter inductors L1 and L2 and filter capacitors C1 and C2.
Because the output current of the grid-connected inverter is mismatched with the current of the power grid, in order to ensure the stability of the power grid and the effective entering of the current of the inverter into the power grid, the control of each switching tube in the high-frequency full-bridge grid-connected inverter circuit is generally realized by adopting a peak current control mode in the prior art; that is, the control is performed with reference to the peak envelope Iref of the inductor current in fig. 2.
However, referring to fig. 2, in the peak current control method, the operating frequency of the high-frequency full-bridge grid-connected inverter circuit is different due to the difference of the output power in the same half power frequency cycle. The working frequency of the high-frequency full-bridge grid-connected inverter circuit is not fixed, so that the peak envelope Iref of the inductive current and the effective value Io of the inductive current are in a nonlinear relation. In order to ensure that the output current of the inverter, that is, the effective value Io of the inductor current, is a high-quality sine waveform, it is necessary to provide a device capable of effectively controlling the output current of the inverter.
Disclosure of Invention
In view of the above, the present invention provides a control device for a grid-connected inverter, so as to provide a device capable of effectively realizing control of an output current of the inverter.
In order to achieve the purpose, the technical scheme provided by the application is as follows:
a control device of a grid-connected inverter, comprising:
the reference unit is used for generating reference current of each phase according to the alternating current detection voltage and the bus detection voltage;
the inductive current sampling unit is used for sampling inductive current of each phase;
the lower bridge arm voltage detection unit is used for detecting drain-source voltage of each phase of lower bridge arm switching tube and generating a comparison result of the drain-source voltage of the corresponding phase and preset voltage; the preset voltage is a drain-source voltage value representing that the corresponding phase inductance current is zero;
the driving unit is used for driving the corresponding phase switching tube to be switched off when the corresponding phase inductive current is increased to the corresponding phase reference current; and when the drain-source voltage of the corresponding phase is reduced to the preset voltage, the corresponding phase of the switch tube is driven to be conducted.
Preferably, the reference unit includes: the device comprises an alternating current detection module, a bus detection module and M reference current generation modules; m is the number of bridge arms of the grid-connected inverter;
the input ends of the M reference current generation modules are respectively connected with the output end of the alternating current detection module and the output end of the bus detection module;
and the output ends of the M reference current generation modules respectively output M-phase reference currents.
Preferably, the reference unit includes: the device comprises an alternating current detection module, a bus detection module and a reference current generation module;
the input end of the reference current generation module is respectively connected with the output end of the alternating current detection module and the output end of the bus detection module;
and the output end of the reference current generation module outputs the reference current of each phase.
Preferably, the inductor current sampling unit includes: m current sensors; and M is the number of bridge arms of the grid-connected inverter.
Preferably, the lower arm voltage detection unit includes: m quasi-resonant control circuits; and M is the number of bridge arms of the grid-connected inverter.
Preferably, the driving unit includes: m driving modules, wherein M is the number of bridge arms of the grid-connected inverter.
Preferably, the driving module includes: a comparator, a controller and a driver;
the non-inverting input end of the comparator receives corresponding phase inductance current;
the inverting input end of the comparator receives corresponding phase reference current;
the output end of the comparator is connected with one input end of the controller;
the other input end of the controller receives the drain-source voltage of the corresponding lower bridge arm switching tube;
the input end of the driver is connected with the output end of the controller;
and the output end of the driver is connected with the control end of the corresponding upper bridge arm switching tube.
Preferably, the controller is a Micro Control Unit (MCU) chip.
According to the scheme, the control device of the grid-connected inverter provided by the invention generates the reference current of each phase according to the alternating current detection voltage and the bus detection voltage through the reference unit; sampling each phase of inductive current through an inductive current sampling unit; the lower bridge arm voltage detection unit detects drain-source voltages of the lower bridge arm switching tubes of all phases and generates a comparison result of the drain-source voltages of the corresponding phases and preset voltages; finally, when the corresponding phase inductance current is increased to the corresponding phase reference current through the driving unit, the corresponding phase switching tube is driven to be turned off; and when the drain-source voltage of the corresponding phase is reduced to the preset voltage, the corresponding phase of the switch tube is driven to be conducted. The preset voltage is a drain-source voltage value representing that the corresponding phase inductance current is zero, so that the control device of the grid-connected inverter finally drives the corresponding phase switching tube to be switched off when the corresponding phase inductance current is increased to the corresponding phase reference current, and drives the corresponding phase switching tube to be switched on when the corresponding phase inductance current is zero.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a grid-connected inverter provided in the prior art;
fig. 2 is a schematic output curve waveform diagram of the grid-connected inverter according to the embodiment of the present invention;
fig. 3 is a schematic structural diagram of a control device of a grid-connected inverter according to an embodiment of the present invention;
fig. 4 is a diagram of an output curve and a driving signal waveform of the grid-connected inverter according to the embodiment of the present invention;
fig. 5 is a schematic structural diagram of a control device of a grid-connected inverter according to an embodiment of the present invention;
fig. 6 is a diagram of an output curve and a driving signal waveform of the grid-connected inverter according to the embodiment of the present invention;
fig. 7 is a schematic structural diagram of a control device of a grid-connected inverter according to an embodiment of the present invention;
fig. 8 is a diagram of an output curve and a driving signal waveform of the grid-connected inverter according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a control device of a grid-connected inverter, and provides a device capable of realizing accurate control of output current of the inverter.
Specifically, the control device for the grid-connected inverter, as shown in fig. 3, includes: the circuit comprises a reference unit 100, an inductive current sampling unit 200, a lower bridge arm voltage detection unit 300 and a driving unit 400; wherein:
the input end of the reference unit 100 is respectively connected with the alternating current output side of the grid-connected inverter and the direct current bus;
the inductive current sampling unit 200 is respectively connected with each phase inductor in series;
the input end of the inductive current sampling unit 200 is connected with the middle point of each phase bridge arm;
the input end of the driving unit 400 is connected to the output end of the reference unit 100, the output end of the inductive current sampling unit 200, and the output end of the lower bridge arm voltage detection unit 300, respectively;
the output end of the driving unit 400 is connected to the control end of the upper bridge arm switch tube of each phase.
The specific working principle is as follows:
the reference unit 100 is configured to generate a reference current for each phase according to the ac detection voltage and the bus detection voltage;
the inductive current sampling unit 200 is configured to sample an inductive current of each phase;
the lower bridge arm voltage detection unit 300 is configured to detect drain-source voltages of the lower bridge arm switching tubes of each phase, and generate a comparison result between the corresponding phase drain-source voltage and a preset voltage; presetting a drain-source voltage value when the corresponding phase inductance current is zero;
the driving unit 400 is configured to drive the corresponding phase switching tube to turn off when the corresponding phase inductor current increases to the corresponding phase reference current; and when the drain-source voltage of the corresponding phase is reduced to a preset voltage, the corresponding phase of the switch tube is driven to be conducted.
Referring to fig. 4, the preset voltage is a drain-source voltage value representing that the corresponding phase inductor current is zero; therefore, it is finally realized by the driving unit 400 that the inductive current I in the corresponding phaseLWhen the current increases to the corresponding phase reference current Iref, the corresponding phase switching tube is driven to be turned off, and the corresponding phase inductive current ILWhen the voltage is zero, the corresponding phase switching tube is driven to be conducted. Within a half power frequency period, the driving signal of the obtained one-phase switch tube is shown as the waveform at the bottom of fig. 4, wherein tonFor its on-time, toffIts off time.
According to the control device of the grid-connected inverter provided by the embodiment, through the principle, the effective control of the corresponding phase switching tube is finally realized, and the output current of the inverter, namely the effective value Io of the inductive current, is ensured to be a high-quality sine waveform.
In another embodiment of the present invention, a specific control device for a grid-connected inverter is further provided, and on the basis of the above-mentioned embodiment and fig. 3 and 4, preferably, referring to fig. 5 or 6, the inductive current sampling unit 200 includes: m current sensors; and M is the number of bridge arms of the grid-connected inverter.
Preferably, referring to fig. 5 or 6, the lower arm voltage detecting unit 300 includes: m quasi-resonant control circuits; and M is the number of bridge arms of the grid-connected inverter.
Preferably, referring to fig. 5 or 6, the driving unit 400 includes: m drive modules, wherein M is the number of bridge arms of the grid-connected inverter.
Preferably, referring to fig. 5 or 6, the driving module includes: a comparator 401, a controller 402, and a driver 403;
the non-inverting input terminal of the comparator 401 receives the corresponding phase inductor current;
the inverting input terminal of the comparator 401 receives the corresponding phase reference current;
the output terminal of the comparator 401 is connected to one input terminal of the controller 402;
the other input end of the controller 402 receives the drain-source voltage of the corresponding lower bridge arm switching tube;
an input of the driver 403 is connected to an output of the controller 402;
the output end of the driver 403 is connected to the control end of the corresponding upper bridge arm switch tube.
The controller 402 may be implemented by an MCU (micro controller Unit) chip, which is not limited herein and may be determined by its specific application environment and is within the scope of the present application.
Specifically, when the inductor current is smaller than the reference current, the output of the comparator 401 is 0; when the inductor current reaches the reference current, the comparator 401 output is 1. The following controls are implemented by the controller 402: when the inductive current is increased to be equal to the reference current, the corresponding upper bridge arm switching tube Smos1 or Smos3 is turned off; when the inductive current is reduced to 0, the corresponding upper bridge arm switching tube Smos1 or Smos3 is switched on.
When the inductive current is reduced to 0, the corresponding quasi-resonance control circuit is started, namely, the full-bridge switch tube is switched on. The quasi-resonance control circuit samples the drain-source voltage of the switching tube Smos2 or Smos4, and when the drain-source voltage of the lower bridge arm switching tube is higher than a quasi-resonance threshold (namely preset voltage), the output of the quasi-resonance control circuit is 1; when the drain-source voltage of the lower bridge arm switching tube is reduced to a quasi-resonance threshold (namely a preset voltage), the output of the quasi-resonance control circuit is 0.
Through the controller 402, the drive module is finally enabled to achieve the following control: when the inductive current is increased to be equal to the reference current, the corresponding upper bridge arm switching tube is turned off; when the drain-source voltage of the lower bridge arm switch tube is reduced to a quasi-resonance threshold (namely a preset voltage), the corresponding upper bridge arm switch tube is switched on.
Preferably, referring to fig. 5, the reference unit 100 includes: the system comprises an alternating current detection module 101, a bus detection module 102 and M reference current generation modules 103; m is the number of bridge arms of the grid-connected inverter;
the input ends of the M reference current generation modules 103 are respectively connected with the output end of the alternating current detection module 101 and the output end of the bus detection module 102;
the output ends of the M reference current generation modules 103 output M-phase reference currents, respectively.
Referring to fig. 6, the upper arm switching tubes Smos1 and Smos3 are controlled by dual current references respectively, and each current reference works for half a grid period, that is, each grid period realizes effective control.
Alternatively, referring to fig. 7, the reference unit includes: the system comprises an alternating current detection module 101, a bus detection module 102 and a reference current generation module 103;
the input end of the reference current generation module 103 is connected with the output end of the alternating current detection module 101 and the output end of the bus detection module 102 respectively;
the output end of the reference current generation module 103 outputs the reference current of each phase.
The differences between fig. 5 and fig. 7 are: in the form of a reference cell shown in fig. 5, there are two reference currents, reference current 1 and reference current 2 shown in fig. 6, which are interleaved with each other for half a grid cycle, and in this case, the calculation and processing processes of the controller 402 are two. In the form of the reference unit shown in fig. 7, referring to fig. 8, the driving control of the switching tube Smos1 comes from the first half period of the reference current, and the reference current in the second half period is used for generating the driving of the switching tube Smos3, that is, one reference current is used for controlling two switching tubes, and the reference current is used in a time-sharing manner. The form of the reference unit shown in fig. 7 reduces the corresponding operation work of one reference current generation module 103 and the controller 402, reduces the resource usage of the controller 402, reduces the number of components and cost, and improves efficiency, compared to the form shown in fig. 5. Meanwhile, the difference between the two reference currents is eliminated, and the waveform quality of the output current is further improved.
The scheme for controlling the peak current of the high-frequency full-bridge grid-connected inverter provided by the embodiment adopts the combination of digital and analog to control. And adopt unique LC filtering mode, be different from the traditional LC filtering mode between L, N, this embodiment adopts L to the LC filtering mode on full-bridge ground, N to full-bridge ground, and the filtering effect is better.
It should be noted that fig. 3, fig. 5, and fig. 7 are all shown with the number of bridge arms of the grid-connected inverter being 2, and the output of the grid-connected inverter is two-phase alternating current; of course, the number of the bridge arms of the grid-connected inverter may also be 3, the output of the grid-connected inverter is three-phase alternating current, the number of the modules in each corresponding unit will be 3, the specific working principle is the same, and only the waveform of the reference current will be different from that in fig. 6 and 8, which is not described herein any more and is all within the protection scope of the present application.
The specific working principle is the same as that of the above embodiment, and is not described in detail here.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A control device for a grid-connected inverter, comprising:
the system comprises a reference unit, a control unit and a control unit, wherein the reference unit is used for generating reference current of each phase according to alternating current detection voltage and bus detection voltage, and the alternating current detection voltage is voltage obtained by detecting an alternating current output side of a grid-connected inverter;
the inductive current sampling unit is used for sampling inductive current of each phase, and the inductor is a filter inductor of a high-frequency full-bridge grid-connected inverter circuit;
the lower bridge arm voltage detection unit is used for detecting drain-source voltage of each phase of lower bridge arm switching tube and generating a comparison result of the drain-source voltage of the corresponding phase and preset voltage; the preset voltage is a drain-source voltage value representing that the corresponding phase inductance current is zero;
the driving unit is used for driving the corresponding phase upper bridge arm switching tube to be switched off when the corresponding phase inductive current is increased to the corresponding phase reference current; and when the drain-source voltage of the corresponding phase is reduced to the preset voltage, driving the upper bridge arm switching tube of the corresponding phase to be conducted.
2. The grid-connected inverter control device according to claim 1, wherein the reference unit includes: the device comprises an alternating current detection module, a bus detection module and M reference current generation modules; m is the number of bridge arms of the grid-connected inverter;
the input ends of the M reference current generation modules are respectively connected with the output end of the alternating current detection module and the output end of the bus detection module;
and the output ends of the M reference current generation modules respectively output M-phase reference currents.
3. The grid-connected inverter control device according to claim 1, wherein the reference unit includes: the device comprises an alternating current detection module, a bus detection module and a reference current generation module;
the input end of the reference current generation module is respectively connected with the output end of the alternating current detection module and the output end of the bus detection module;
and the output end of the reference current generation module outputs the reference current of each phase.
4. The grid-connected inverter control device according to claim 1, wherein the inductor current sampling unit includes: m current sensors; and M is the number of bridge arms of the grid-connected inverter.
5. The control device of the grid-connected inverter according to claim 1, wherein the lower arm voltage detection means includes: m quasi-resonant control circuits; and M is the number of bridge arms of the grid-connected inverter.
6. The grid-connected inverter control device according to claim 1, wherein the drive unit includes: m driving modules, wherein M is the number of bridge arms of the grid-connected inverter.
7. The grid-connected inverter control device according to claim 6, wherein the drive module includes: a comparator, a controller and a driver;
the non-inverting input end of the comparator receives corresponding phase inductance current;
the inverting input end of the comparator receives corresponding phase reference current;
the output end of the comparator is connected with one input end of the controller;
the other input end of the controller receives the drain-source voltage of the corresponding lower bridge arm switching tube;
the input end of the driver is connected with the output end of the controller;
and the output end of the driver is connected with the control end of the corresponding upper bridge arm switching tube.
8. The control device of the grid-connected inverter according to claim 7, wherein the controller is a Micro Control Unit (MCU) chip.
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| CN201710373031.5A CN106961123B (en) | 2017-05-24 | 2017-05-24 | Control device of grid-connected inverter |
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| CN201710373031.5A CN106961123B (en) | 2017-05-24 | 2017-05-24 | Control device of grid-connected inverter |
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| CN102856928B (en) * | 2012-09-27 | 2015-12-02 | 北京京仪绿能电力系统工程有限公司 | A kind of inverter |
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