CN109980980A - Voltage control device and method of converter and converter - Google Patents

Voltage control device and method of converter and converter Download PDF

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Publication number
CN109980980A
CN109980980A CN201711455750.8A CN201711455750A CN109980980A CN 109980980 A CN109980980 A CN 109980980A CN 201711455750 A CN201711455750 A CN 201711455750A CN 109980980 A CN109980980 A CN 109980980A
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China
Prior art keywords
converter
current
module
feedback
phase
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CN201711455750.8A
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Inventor
李峰
敬双
杨志千
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Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
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Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
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Priority to CN201711455750.8A priority Critical patent/CN109980980A/en
Publication of CN109980980A publication Critical patent/CN109980980A/en
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    • H02J3/386—
    • 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
    • H02M7/539—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 with automatic control of output wave form or frequency
    • H02M7/5395—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 with automatic control of output wave form or frequency by pulse-width modulation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

The invention discloses a voltage control device and method of a converter and the converter. The device comprises a first comparison module, a first feedback regulation module, a second comparison module and a second feedback regulation module which are connected in sequence; the first input end of the first comparison module receives an input voltage given value of the converter, the second input end of the first comparison module receives a feedback voltage value of the converter, the first feedback regulation module outputs a current given value according to a comparison result of the first comparison module, the first input end of the second comparison module receives the current given value output by the first comparison module, the second input end of the second comparison module receives a current feedback value of the converter, and the second feedback regulation module outputs a Pulse Width Modulation (PWM) signal for driving an Insulated Gate Bipolar Transistor (IGBT) in the converter according to the comparison result of the second comparison module so as to regulate the input voltage of the converter. By adopting the technical scheme in the embodiment of the invention, the response speed to the voltage control of the converter can be improved.

Description

Voltage control device and method of converter and converter
Technical Field
The invention relates to the technical field of wind power generation, in particular to a voltage control device and method of a converter and the converter.
Background
The rectified power generation capacity of the wind generating set needs to be incorporated into a power grid through a converter. When the grid is not operating stably, such as the grid voltage rises or drops, the energy that can be incorporated into the grid is reduced, but the output power of the wind energy installation remains unchanged for a while, causing fluctuations in the input voltage of the converter.
In order to control the fluctuation of the input voltage of the converter, the method in the prior art is to obtain the duty ratio of the modulated voltage by a voltage error obtained by subtracting the given value of the input voltage of the converter from the feedback value of the input voltage of the converter through a PI regulator, and then convert the modulated voltage into a PWM signal through a PWM generator to drive the IGBT in the control object, that is, to control the input current of the converter according to the voltage difference signal.
However, the inventors of the present application have found that in the conventional method for controlling the input current of the converter according to the voltage difference signal, the feedback voltage signal of the converter needs to be converted into the current signal. Due to the fact that a voltage-current conversion step exists in the control link, the response speed of the converter voltage control is reduced.
Disclosure of Invention
The embodiment of the invention provides a voltage control device and method of a converter and the converter, which can improve the response rate of voltage control of the converter.
In a first aspect, an embodiment of the present invention provides a voltage control apparatus for a converter, where the apparatus includes a first comparison module, a first feedback adjustment module, a second comparison module, and a second feedback adjustment module, which are connected in sequence; the first input end of the first comparison module receives an input voltage given value of the converter, the second input end of the first comparison module receives a feedback voltage value of the converter, the first feedback regulation module outputs a current given value according to a comparison result of the first comparison module, the first input end of the second comparison module receives the current given value output by the first comparison module, the second input end of the second comparison module receives a current feedback value of the converter, and the second feedback regulation module outputs a Pulse Width Modulation (PWM) signal for driving an Insulated Gate Bipolar Transistor (IGBT) in the converter according to the comparison result of the second comparison module so as to regulate the input voltage of the converter.
In some embodiments of the first aspect, the second feedback regulation module is a hysteresis regulator.
In some embodiments of the first aspect, a current limiter is provided in a line between the first feedback adjustment module and the second comparison module, and a current limiting value is preset in the current limiter.
In some embodiments of the first aspect, a first switching device is disposed in a line between the first feedback regulation module and the second comparison module, the first switching device is configured to be turned off when the output of the converter is connected to the voltage source, and the first input of the second comparison module receives a predetermined external current setpoint.
In some embodiments of the first aspect, the converter is a DC/AC converter, and an output terminal of the DC/AC converter is connected to a three-phase grid; the second feedback regulation module comprises three hysteresis regulators which are arranged in parallel and respectively connected with the three comparators; the apparatus also includes a phase-locked loop and an operator; the phase-locked loop obtains a power grid phase according to a three-phase voltage signal of a three-phase power grid, the arithmetic unit outputs three paths of current set values according to a current set value and the power grid phase output by the first feedback adjusting module, a first end of each comparator receives one path of current set value, a second end of each comparator receives a current feedback value of a corresponding phase in the three-phase power grid, and each hysteresis adjuster outputs a Pulse Width Modulation (PWM) signal for driving a corresponding Insulated Gate Bipolar Translator (IGBT) in the DC/AC converter according to a comparison result of the corresponding comparator so as to adjust the input voltage of the DC/AC converter.
In some embodiments of the first aspect, a second switching device is provided in a line between the first feedback regulation module and the second comparison module, the second switching device is configured to open when the DC side of the DC/AC converter is connected to a voltage source, and the first input of the second comparison module receives a predetermined external current setpoint.
In a second aspect, an embodiment of the present invention provides a voltage control method for a converter, where the method includes:
the first feedback regulation module outputs a given current value according to a given input voltage value of the converter and a given feedback voltage value of the converter;
and the second feedback regulation module outputs a PWM signal for driving the IGBT in the converter according to the current set value output by the first feedback regulation module and the current feedback value of the converter so as to regulate the input voltage of the converter.
In some embodiments of the second aspect, the first switching device is controlled to be open and the second feedback regulation module is controlled to receive a preset external current setpoint when the output of the converter is connected to the voltage source.
In some embodiments of the second aspect, the converter is a DC/AC converter, and the output terminal of the DC/AC converter is connected to a three-phase grid; the second feedback regulation module comprises three hysteresis regulators which are arranged in parallel; the device also comprises a phase-locked loop and an arithmetic unit; the method further comprises the following steps: obtaining a power grid phase by a phase-locked loop according to a three-phase voltage signal of a three-phase power grid; the arithmetic unit outputs three current set values according to the current set value output by the first feedback adjusting module and the phase of the power grid; and each hysteresis regulator outputs a PWM signal for driving a corresponding IGBT in the DC/AC converter according to a given current value and a current feedback value of a corresponding phase in the three-phase power grid so as to adjust the input voltage of the DC/AC converter.
In a third aspect, the embodiment of the present invention provides a converter, which includes the voltage control apparatus of the converter.
As described above, in the voltage control apparatus of the converter in the embodiment of the present invention, the second comparison module and the second feedback regulation module are added on the basis of the first comparison module and the first feedback regulation module, so as to establish a current inner loop control mechanism for the input voltage of the converter. Compared with the prior art that the feedback voltage signal of the converter needs to be converted into the current signal (voltage outer ring) first, and the correction effect can be generated only when the output voltage changes enough, the current inner ring in the embodiment of the invention has the advantage of high response speed, and when the input current of the converter is reduced, the duty ratio of the PWM signal in the second feedback regulation module can be updated immediately, so that the unnecessary fluctuation of the output voltage is avoided, and the power supply voltage of the converter is more stable.
Drawings
The present invention will be better understood from the following description of specific embodiments thereof taken in conjunction with the accompanying drawings, in which like or similar reference characters designate like or similar features.
Fig. 1 is a schematic structural diagram of a voltage control apparatus of a converter according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a voltage control apparatus of a converter according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of a voltage control apparatus of a converter according to another embodiment of the present invention;
fig. 4 is a schematic flowchart of a voltage control method of a converter according to an embodiment of the present invention;
fig. 5 is a schematic flowchart of a voltage control method of a converter according to another embodiment of the present invention.
Description of reference numerals:
101-a first comparison module; 102-a first feedback adjustment module; 103-a second comparison module;
104-a second feedback adjustment module; 105-a current transformer; 1011-a first comparator;
1021-a PI regulator; 1031-a second comparator; 1041-a hysteresis regulator;
1051-a DC/AC converter; 302-a phase-locked loop; 303-an operator.
Detailed Description
Features of various aspects of embodiments of the invention and exemplary embodiments will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of embodiments of the invention.
The embodiment of the invention provides a voltage control device and method of a converter and the converter, which are used for controlling the input voltage of the converter of a wind generating set.
Fig. 1 is a schematic structural diagram of a voltage control apparatus of a converter 105 according to an embodiment of the present invention. As shown in fig. 1, the voltage control apparatus of the converter 105 includes a first comparison module 101, a first feedback regulation module 102, a second comparison module 103, and a second feedback regulation module 104, which are connected in sequence.
A first input end of the first comparing module 101 receives an input voltage given value U of the converter 105, a second input end of the first comparing module 101 receives a feedback voltage value U of the converter 105, the first feedback adjusting module 102 outputs a current given value I according to a comparison result of the first comparing module 101, a first input end of the second comparing module 103 receives a current given value I output by the first comparing module 101, a second input end of the second comparing module 103 receives a current feedback value I of the converter 105, and the second feedback adjusting module 104 outputs a pulse width modulation PWM signal for driving the IGBTs in the converter 105 according to a comparison result of the second comparing module 103, so as to adjust the input voltage of the converter 105.
As described above, in the voltage control apparatus of the converter 105 in the embodiment of the present invention, the second comparing module 103 and the second feedback regulating module 104 are added to the first comparing module 101 and the first feedback regulating module 102, so as to establish a current inner loop control mechanism for the input voltage of the converter 105. Compared with the prior art that the feedback voltage signal of the converter 105 needs to be converted into a current signal (voltage outer ring) first, and the correction effect can be generated only when the output voltage changes sufficiently, the current inner ring in the embodiment of the invention has the advantage of high response speed, and when the input current of the converter 105 is reduced, the duty ratio of the PWM signal in the second feedback regulation module 104 can be updated immediately, so that the unnecessary fluctuation of the output voltage is avoided, and the power supply voltage of the converter 105 is more stable.
In addition, the reduction of the voltage fluctuation of the converter 105 means that the capacitance value can be selected to be smaller when the capacitance in the converter 105 is selected, which is beneficial to reducing the cost and the volume of the converter 105.
Fig. 2 is a schematic structural diagram of a voltage control apparatus of a converter according to another embodiment of the present invention. Fig. 2 is different from fig. 1 in that the first feedback regulation module 102 in fig. 2 is specifically a PI regulator 1021, the second feedback regulation module 104 is specifically a hysteresis regulator 1041, the first comparison module 101 is specifically a first comparator 1011, and the second comparison module 103 is specifically a second comparator 1031.
Since the hysteretic regulator 1041 has an advantage of fast response speed compared to other types of feedback regulators, the second feedback regulation module 104 is preferably the hysteretic regulator 1041 in this embodiment of the invention.
The operating principle of the voltage control arrangement of the converter 105 in the example of fig. 2 is: a first input end of the first comparator 1011 receives an input voltage given value U of the converter 105, a second input end of the first comparator 1011 receives a feedback voltage value U of the converter 105, the PI regulator 1021 outputs a current given value I according to a comparison result U of the first comparator 1011, a first input end of the second comparator 1031 receives the current given value I output by the first comparator 1011, a second input end of the second comparator 1031 receives a current feedback value I of the converter 105, and the hysteresis regulator 1041 outputs a pulse width modulation PWM signal for driving the IGBTs in the converter 105 according to the comparison result I-I of the second comparator 1031 to adjust the input voltage of the converter 105.
According to the embodiment of the present invention, in order to prevent the input current of the converter 105 from being too large, the given current value I output by the PI regulator 1021 may be limited, and specifically, a current limiter (not shown in the figure) may be disposed on a line between the PI regulator 1021 and the second comparator 1031, and a current limiting value, such as the maximum operating current of the converter 105, is preset in the current limiter. By the arrangement, when the load is suddenly increased, once the current given signal reaches the maximum value, the current given signal is limited, so that the system can operate at the maximum current, and the overcurrent fault problem caused by the fact that the current is not limited in heavy-load operation is avoided.
According to embodiments of the present invention, the voltage outer loop may be disconnected during some conditions where current is only required to be applied to the input of the converter 105, such as when the output of the converter 105 is connected to a voltage source. For example, a first switching device (not shown) is disposed on a line between the PI regulator 1021 and the second comparator 1031, and is turned off when the output terminal of the converter 105 is connected to the voltage source, and a first input terminal of the second comparing module 103 receives a preset external current set value (for example, a current set signal is directly set by a user). By means of the arrangement, the input power of the converter 105 is controlled on one hand, and the power output to the voltage source is controlled on the other hand, so that accurate control over the converter 105 is achieved. In addition, in order to flexibly deal with different working conditions, the two working modes can be switched on line.
It should be noted that, the converter in the wind generating set includes a DC/DC converter and a DC/AC converter, and when the converter is a DC/DC converter, the voltage control device of the converter in the embodiment of the present invention may be directly constructed in the connection manner shown in fig. 2. When the converter is a DC/AC converter, the voltage control device of the converter in fig. 2 needs to be adjusted because the output terminal of the DC/AC converter is connected to the three-phase grid.
Fig. 3 is a schematic structural diagram of a voltage control device of a converter according to yet another embodiment of the present invention, which is used to show a connection structure between components of the voltage control device of the converter when the converter is a DC/AC converter. Different from fig. 2, the voltage control apparatus of the converter in fig. 3 further includes a phase-locked loop 302 and an operator 303, and the second comparing module 103 includes three comparators arranged in parallel, and the second feedback regulating module 104 includes three hysteretic regulators arranged in parallel and respectively connected with the three comparators.
The operating principle of the voltage control device of the DC/AC converter 1051 in the example of fig. 3 is:
a first input terminal of the first comparator 1011 receives a given value U of an input voltage of the converterdcA second input terminal of the first comparator 1011 receives the feedback voltage value U of the converterdcThe PI regulator is based on the comparison result U of the first comparator 1011dc*-UdcGiven value of output current Idc *(ii) a The phase locked loop 302 is based on three phase voltage signals (U) of a three phase power grida，Ub，Uc) Obtaining the power grid phase theta, and the arithmetic unit 303 gives a given value I according to the current output by the PI regulatordc *And the phase theta of the power grid, and three current given values are outputThe first end of each comparator receives a given current value, the second end of each comparator receives a current feedback value of a corresponding phase in a three-phase power grid, and each hysteresis regulator outputs a Pulse Width Modulation (PWM) signal for driving a corresponding Insulated Gate Bipolar Transistor (IGBT) in a direct current/alternating current (DC/AC) converter 1051 according to a comparison result of the corresponding comparator so as to adjust the input voltage of the DC/AC converter 1051.
According to the embodiment of the invention, when U isa，UbAnd UcWhen the voltage source is a three-phase voltage source, the direct current voltage has good stability by simultaneously controlling the alternating current and the direct current voltage.
When the dc-side voltage source is connected, the voltage loop can be switched off. For example, a second switching device may be provided in a line between the PI regulator and the second comparison module 103, the second switching device being configured to be turned off when the DC side of the DC/AC converter 1051 is connected to a voltage source, and the first input of the second comparison module 103 receiving a predetermined external current setpoint Idc *For example, by user giving I directlydc *To control the power input to the DC side of the DC/AC converter 1051.
Fig. 4 is a schematic flowchart of a voltage control method of a converter according to an embodiment of the present invention, which is used for a voltage control apparatus of the converter in fig. 1 and fig. 2. Steps 401 to 404 are shown in fig. 4.
In step 401, the given value of the input voltage of the converter is received by the first input terminal of the first comparing module 101, and the feedback voltage value of the converter is received by the second input terminal of the first comparing module 101.
In step 402, a current set-point is output by the first feedback adjustment module 102 according to the comparison result of the first comparison module 101.
In step 403, the first input terminal of the second comparing module 103 receives the given current value outputted by the first comparing module 101, and the second input terminal of the second comparing module 103 receives the current feedback value of the current transformer.
In step 404, a PWM signal for driving the IGBT in the converter is output by the second feedback regulating module 104 according to the comparison result of the second comparing module 103 to adjust the input voltage of the converter.
According to the embodiment of the invention, in some working conditions that only the current needs to be carried out on the input of the converter, the first switching device can be controlled to be switched off when the output end of the converter is connected to the voltage source, and the first input end of the second comparison module 103 receives a preset external current set value.
Fig. 5 is a schematic flowchart of a voltage control method of a converter according to another embodiment of the present invention, which is used for a voltage control apparatus of the DC/AC converter 1051 in fig. 3. Fig. 5 is different from fig. 4 in that step 405 to step 408 are further included in fig. 5.
In step 405, the phase of the power grid is obtained by the phase locked loop 302 from the three-phase voltage signals of the three-phase power grid.
In step 406, the operator 303 outputs three current set values according to the current set value output by the first feedback adjustment module 102 and the grid phase.
In step 407, a first terminal of each comparator receives a given current value, and a second terminal of each comparator receives a current feedback value of a corresponding phase in the three-phase power grid.
In step 408, a pulse width modulation PWM signal for driving a corresponding IGBT in the DC/AC converter 1051 is output by each hysteretic regulator according to the comparison result of the corresponding comparator to adjust the input voltage of the DC/AC converter 1051.
The embodiment of the invention also provides the converter, which comprises the voltage control device of the converter.
It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. For the device embodiments, reference may be made to the description of the method embodiments in the relevant part. Embodiments of the invention are not limited to the specific steps and structures described above and shown in the drawings. Those skilled in the art may make various changes, modifications and additions to, or change the order between the steps, after appreciating the spirit of the embodiments of the invention. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.
The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of an embodiment of the invention are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information. Examples of a machine-readable medium include electronic circuits, semiconductor memory devices, ROM, flash memory, Erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, Radio Frequency (RF) links, and so forth. The code segments may be downloaded via computer networks such as the internet, intranet, etc.
Embodiments of the present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. For example, the algorithms described in the specific embodiments may be modified without departing from the basic spirit of the embodiments of the present invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the embodiments of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (10)

1. The voltage control device of the converter is characterized by comprising a first comparison module, a first feedback regulation module, a second comparison module and a second feedback regulation module which are sequentially connected; wherein,
a first input end of the first comparison module receives an input voltage given value of the current transformer, and a second input end of the first comparison module receives a feedback voltage value of the current transformer;
the first feedback adjusting module outputs a given current value according to the comparison result of the first comparing module;
a first input end of the second comparison module receives a given current value output by the first comparison module, and a second input end of the second comparison module receives a current feedback value of the converter;
and the second feedback adjusting module outputs a Pulse Width Modulation (PWM) signal for driving an Insulated Gate Bipolar Transistor (IGBT) in the converter according to the comparison result of the second comparing module so as to adjust the input voltage of the converter.
2. The apparatus of claim 1, wherein the second feedback regulation module is a hysteresis regulator.
3. The apparatus of claim 2, wherein a current limiter is disposed in a line between the first feedback regulation module and the second comparison module.
4. The apparatus of claim 2, wherein a first switching device is disposed on a line between the first feedback regulation module and the second comparison module, the first switching device is configured to be turned off when the output of the converter is connected to a voltage source, and the first input of the second comparison module receives a predetermined external current setpoint.
5. The device of claim 1, wherein the converter is a DC/AC converter, and an output end of the DC/AC converter is connected to a three-phase grid;
the second comparison module comprises three comparators arranged in parallel, and the second feedback regulation module comprises three hysteresis regulators arranged in parallel and respectively connected with the three comparators;
the device also comprises a phase-locked loop and an arithmetic unit; wherein,
the phase-locked loop obtains a power grid phase according to the three-phase voltage signal of the three-phase power grid;
the arithmetic unit outputs three current set values according to the current set value output by the first feedback regulation module and the power grid phase;
the first end of each comparator receives one path of current given value, the second end of each comparator receives a current feedback value of a corresponding phase in a three-phase power grid, and each hysteresis regulator outputs a Pulse Width Modulation (PWM) signal for driving a corresponding Insulated Gate Bipolar Transistor (IGBT) in the DC/AC converter according to a comparison result of the corresponding comparator so as to adjust the input voltage of the DC/AC converter.
6. The apparatus of claim 5, wherein a second switching device is disposed on a line between the first feedback regulating module and the second comparing module, the second switching device is configured to be turned off when the DC side of the DC/AC converter is connected to a voltage source, and the first input terminal of the second comparing module receives a preset external current setpoint.
7. A voltage control method of a converter is characterized by comprising the following steps:
a first feedback regulation module outputs a given current value according to a given input voltage value of the converter and a given feedback voltage value of the converter;
and outputting a PWM (pulse-width modulation) signal for driving the IGBT (insulated gate bipolar translator) in the converter by a second feedback regulation module according to the current given value output by the first feedback regulation module and the current feedback value of the converter so as to regulate the input voltage of the converter.
8. The method of claim 7, further comprising: when the output end of the converter is connected to a voltage source, the first switching device is controlled to be switched off, and the second feedback adjusting module is controlled to receive a preset external current given value.
9. The method of claim 7, wherein the converter is a DC/AC converter, and the output of the DC/AC converter is connected to a three-phase grid; the second feedback regulation module comprises three hysteresis regulators which are arranged in parallel;
the method further comprises the following steps:
obtaining a power grid phase by a phase-locked loop according to the three-phase voltage signal of the three-phase power grid;
outputting three current set values by an arithmetic unit according to the current set value output by the first feedback adjusting module and the power grid phase;
and each hysteresis regulator outputs a PWM signal for driving a corresponding IGBT in the DC/AC converter according to a given current value and a current feedback value of a corresponding phase in a three-phase power grid so as to adjust the input voltage of the DC/AC converter.
10. A converter, characterized in that it comprises a voltage control device of a converter according to any of claims 1-6.
CN201711455750.8A 2017-12-28 2017-12-28 Voltage control device and method of converter and converter Pending CN109980980A (en)

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