CN115133799B - Control method of ANPC type inverter and related components - Google Patents

Control method of ANPC type inverter and related components Download PDF

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Publication number
CN115133799B
CN115133799B CN202211059699.XA CN202211059699A CN115133799B CN 115133799 B CN115133799 B CN 115133799B CN 202211059699 A CN202211059699 A CN 202211059699A CN 115133799 B CN115133799 B CN 115133799B
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controllable switch
anpc
controllable
controlling
capacitor
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CN115133799A (en
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陈建明
吴龙生
卢钢
章旌红
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ZHEJIANG HRV ELECTRIC CO Ltd
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ZHEJIANG HRV ELECTRIC CO Ltd
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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
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/487—Neutral point clamped inverters
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The invention discloses a control method and related components of an ANPC (adaptive noise controller) type inverter, and relates to the technical field of power electronics, when the output voltage is positive, namely a third controllable switch is disconnected, the sixth controllable switch is controlled to be connected, so that the voltage at two ends of the third controllable switch is clamped to be one half of the input voltage, and the voltage at two ends of the third controllable switch is prevented from being overlarge; when the output voltage is negative, namely the second controllable switch is switched off, the fifth controllable switch is controlled to be switched on, so that the voltage at two ends of the second controllable switch is clamped to be one half of the input voltage, and the voltage at two ends of the second controllable switch is prevented from being overlarge; when the output voltage oscillates between the first preset threshold and the second preset threshold, namely the output voltage oscillates near a zero crossing point, the sixth controllable switch and the fifth controllable switch are controlled to be conducted, so that the voltage at two ends of the second controllable switch and the voltage at two ends of the third controllable switch are clamped to be one half of the input voltage, and the stability of the ANPC type inverter is guaranteed.

Description

Control method of ANPC type inverter and related components
Technical Field
The present invention relates to the field of power electronics, and in particular, to a method for controlling an ANPC-type inverter and related components.
Background
In high voltage and high power applications, an ANPC (Active Neutral-point-clamped) inverter is often used to convert dc power to ac power. Referring to fig. 1, fig. 1 is a schematic circuit diagram of an ANPC inverter in the prior art, in fig. 1, C1 and C2 are capacitors, S1 to S6 are first to sixth controllable switches, D1 to D6 respectively represent diodes connected in anti-parallel between S1 to S6, and IL is an output current. Ideally, when S1 and S2 are turned off simultaneously, the voltage across S1 is equal to the voltage across S2, which is equal to one half of the input voltage, but actually, due to the unequal parasitic capacitances of the controllable switches, the voltage actually borne across S2 when S1 and S2 are turned off simultaneously is usually greater than one half of the input voltage, and may exceed the voltage range that S2 can bear, thereby damaging S2. Similarly, in practical situations, when S3 and S4 are turned off simultaneously, the voltage across S3 is usually greater than one-half of the input voltage, and may exceed the voltage range that S3 can bear, so that S3 may be damaged, which is not favorable for stable operation of the ANPC-type inverter.
Disclosure of Invention
The invention aims to provide a control method and a related component of an ANPC type inverter, which can ensure that the voltage at two ends of a third controllable switch is not overlarge when the output voltage is positive, ensure that the voltage at two ends of a second controllable switch is not overlarge when the output voltage is negative, and ensure that the voltage at two ends of the second controllable switch and the voltage at two ends of the third controllable switch are not overlarge when the output voltage oscillates near a zero crossing point, namely ensure that the second controllable switch and the third controllable switch are not damaged due to the fact that the voltage exceeds stress voltage in the whole period.
In order to solve the above technical problem, the present invention provides a method for controlling an ANPC-type inverter, the ANPC-type inverter including a first capacitor, a second capacitor, first to sixth controllable switches, and diodes connected in anti-parallel with the controllable switches; the first controllable switch, the second controllable switch, the third controllable switch and the fourth controllable switch are sequentially connected in series, a circuit formed by connecting the first controllable switch, the second controllable switch, the third controllable switch and the fourth controllable switch in series is connected in parallel with a circuit formed by connecting the first capacitor and the second capacitor in series, a common end connected with the first capacitor and the second capacitor is respectively connected with an output end of a fifth controllable switch and an input end of a sixth controllable switch, a common end connected with the first controllable switch and the second controllable switch is connected with an input end of the fifth controllable switch, and a common end connected with the third controllable switch and the fourth controllable switch is connected with an output end of the sixth controllable switch;
the control method of the ANPC type inverter includes:
controlling the sixth controllable switch to be turned on when the output voltage of the ANPC type inverter is positive, and controlling the fifth controllable switch to be turned on when the output voltage is negative;
and when the output voltage oscillates between a first preset threshold and a second preset threshold, controlling the sixth controllable switch and the fifth controllable switch to be both switched on, wherein the first preset threshold is a positive number, and the second preset threshold is a negative number.
Preferably, after the output voltage of the ANPC-type inverter is positive and the sixth controllable switch is controlled to be turned on, the method further includes:
controlling the first controllable switch to be conducted at a first time after the sixth controllable switch is conducted;
controlling the second controllable switch and the third controllable switch to be complementarily conducted at a first preset frequency at a second moment after the first controllable switch is conducted;
controlling the second controllable switch and the third controllable switch to be disconnected at a third time after the second time;
controlling the first controllable switch to be switched off at a fourth time after the second controllable switch and the third controllable switch are both switched off;
controlling the fifth controllable switch to be switched on at a fifth moment after the first controllable switch is switched off;
the first time to the fourth time are all within the same positive half period of the output voltage, and the fifth time is a time corresponding to a zero-crossing point when the output voltage enters a negative half period from the positive half period.
Preferably, after the fifth controllable switch is controlled to be turned on when the output voltage is negative, the method further includes:
controlling the sixth controllable switch to be switched off at a sixth moment after the fifth controllable switch is switched on;
controlling the fourth controllable switch to be switched on at a seventh moment after the sixth controllable switch is switched off;
controlling the second controllable switch and the third controllable switch to be complementarily conducted at a second preset frequency at an eighth moment after the fourth controllable switch is conducted;
wherein the sixth time, the seventh time, and the eighth time are all within the same negative half-cycle of the output voltage.
In order to solve the technical problem, the present application further provides a control system of an ANPC-type inverter, where the ANPC-type inverter includes a first capacitor, a second capacitor, first to sixth controllable switches, and diodes connected in anti-parallel with the controllable switches; the first controllable switch, the second controllable switch, the third controllable switch and the fourth controllable switch are sequentially connected in series, a circuit formed by connecting the first controllable switch, the second controllable switch, the third controllable switch and the fourth controllable switch in series is connected in parallel with a circuit formed by connecting the first capacitor and the second capacitor in series, a common end connected with the first capacitor and the second capacitor is respectively connected with an output end of a fifth controllable switch and an input end of a sixth controllable switch, a common end connected with the first controllable switch and the second controllable switch is connected with an input end of the fifth controllable switch, and a common end connected with the third controllable switch and the fourth controllable switch is connected with an output end of the sixth controllable switch;
the control system of the ANPC type inverter includes:
a first control unit for controlling the sixth controllable switch to be turned on when the output voltage of the ANPC type inverter is positive and controlling the fifth controllable switch to be turned on when the output voltage is negative;
and the second control unit is used for controlling the sixth controllable switch and the fifth controllable switch to be switched on when the output voltage oscillates between a first preset threshold and a second preset threshold, wherein the first preset threshold is a positive number, and the second preset threshold is a negative number.
In order to solve the above technical problem, the present application further provides a control apparatus for an ANPC-type inverter, including:
a memory for storing a computer program;
a processor for implementing the steps of the method for controlling an ANPC-type inverter as described above when executing said computer program.
In order to solve the technical problem, the present application further provides an ANPC-type inverter, including the control device of the aforementioned ANPC-type inverter, further including a first capacitor, a second capacitor, a first controllable switch up to a sixth controllable switch, and diodes connected in anti-parallel with the controllable switches;
the first controllable switch, the second controllable switch, the third controllable switch and the fourth controllable switch are sequentially connected in series, a circuit after the first controllable switch, the second controllable switch, the third controllable switch and the fourth controllable switch are connected in series is connected in parallel with a circuit after the first capacitor and the second capacitor are connected in series, a common end connected with the first capacitor and the second capacitor is respectively connected with an output end of the fifth controllable switch and an input end of the sixth controllable switch, a common end connected with the first controllable switch and the second controllable switch is connected with an input end of the fifth controllable switch, and a common end connected with the third controllable switch and the fourth controllable switch is connected with an output end of the sixth controllable switch.
Preferably, the filter further comprises a filter inductor connected to a common terminal connected to the second controllable switch and the third controllable switch.
Preferably, the second controllable switch and the third controllable switch are MOS transistors or silicon carbide MOS transistors, and the first controllable switch, the fourth controllable switch, the fifth controllable switch, and the sixth controllable switch are all IGBTs.
Preferably, the switching frequencies of the first controllable switch, the fourth controllable switch, the fifth controllable switch and the sixth controllable switch are all power frequencies, and the switching frequencies of the second controllable switch and the third controllable switch are all greater than the rated switching frequency of the IGBT.
In order to solve the above technical problem, the present application further provides a computer-readable storage medium having a computer program stored thereon, where the computer program, when executed by a processor, implements the steps of the above control method for an ANPC-type inverter.
In summary, the present invention provides a control method and related components for an ANPC-type inverter, wherein when the output voltage of the ANPC-type inverter is positive, that is, the third controllable switch is turned off, the sixth controllable switch is controlled to be turned on, so that the voltage across the third controllable switch is clamped to one half of the input voltage, thereby preventing the voltage across the third controllable switch from being too large and further causing damage due to exceeding the stress voltage; when the output voltage of the ANPC type inverter is negative, namely the second controllable switch is disconnected, the fifth controllable switch is controlled to be connected, so that the voltages at two ends of the second controllable switch are clamped to be one half of the input voltage, and the situation that the voltages at two ends of the second controllable switch are too large and then exceed the stress voltage to cause damage is avoided; when the output voltage oscillates between the first preset threshold and the second preset threshold, that is, the output voltage oscillates near the zero crossing point, in order to ensure that the second controllable switch and the third controllable switch are not damaged, the sixth controllable switch and the fifth controllable switch are controlled to be conducted so that the voltage across the second controllable switch and the voltage across the third controllable switch are clamped to be one half of the input voltage, and the stability of the ANPC type inverter is further ensured.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of an ANPC-type inverter of the prior art;
fig. 2 is a flowchart of a control method of an ANPC-type inverter according to the present invention;
fig. 3 is a waveform diagram of a driving signal of an ANPC type inverter according to the present invention;
fig. 4 is a schematic structural diagram of a control system of an ANPC-type inverter according to the present application;
fig. 5 is a schematic structural diagram of a control device of an ANPC-type inverter according to the present application;
fig. 6 is a schematic circuit diagram of an ANPC-type inverter according to the present invention.
Detailed Description
The core of the invention is to provide a control method and related components of an ANPC type inverter, which can ensure that the voltage at two ends of a third controllable switch is not too large when the output voltage is positive, ensure that the voltage at two ends of a second controllable switch is not too large when the output voltage is negative, and ensure that the voltage at two ends of the second controllable switch and the voltage at two ends of the third controllable switch are not too large when the output voltage oscillates near a zero crossing point, namely ensure that the second controllable switch and the third controllable switch are not damaged by exceeding stress voltage in the whole period.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.
Referring to fig. 2, fig. 2 is a flowchart of a control method of an ANPC-type inverter according to the present invention, where the ANPC-type inverter includes a first capacitor, a second capacitor, first to sixth controllable switches, and diodes in anti-parallel connection with the controllable switches; the first controllable switch, the second controllable switch, the third controllable switch and the fourth controllable switch are sequentially connected in series, a circuit formed by connecting the first controllable switch, the second controllable switch, the third controllable switch and the fourth controllable switch in series is connected in parallel with a circuit formed by connecting the first capacitor and the second capacitor in series, the common end connected with the first capacitor and the second capacitor is respectively connected with the output end of the fifth controllable switch and the input end of the sixth controllable switch, the common end connected with the first controllable switch and the second controllable switch is connected with the input end of the fifth controllable switch, and the common end connected with the third controllable switch and the fourth controllable switch is connected with the output end of the sixth controllable switch;
the control method of the ANPC type inverter comprises the following steps:
s1: when the output voltage of the ANPC type inverter is positive, the sixth controllable switch is controlled to be conducted, and when the output voltage is negative, the fifth controllable switch is controlled to be conducted;
s2: and when the output voltage oscillates between a first preset threshold and a second preset threshold, controlling the sixth controllable switch and the fifth controllable switch to be switched on, wherein the first preset threshold is a positive number, and the second preset threshold is a negative number.
The second controllable switch and the third controllable switch in the ANPC type inverter (which are simply referred to as inverter in this application) are easily damaged due to voltage stress during the operation of the inverter, which is not favorable for the normal operation of the inverter.
In order to solve the above technical problem, the present application provides a control method for an ANPC-type inverter, where the inverter is a three-level inverter, and the three-level inverter refers to three values of an output voltage on an ac side of the inverter relative to a dc side: positive voltage, negative voltage, and midpoint zero voltage. When the output voltage of the inverter is a positive voltage, the third controllable switch and the fourth controllable switch in the inverter are both off, and the voltage across the third controllable switch and the voltage across the fourth controllable switch are clamped to be one half of the input voltage of the inverter by controlling the conduction of the sixth controllable switch, that is, the voltage across the third controllable switch and the voltage across the fourth controllable switch are clamped in a stress voltage range, so that the third controllable switch is prevented from being damaged. Similarly, when the output voltage of the inverter is a negative voltage, the second controllable switch and the first controllable switch in the inverter are both off, and the voltage at two ends of the first controllable switch and the voltage at two ends of the second controllable switch are clamped by one half of the input voltage of the inverter by controlling the fifth controllable switch to be on, that is, the voltage at two ends of the second controllable switch and the voltage at two ends of the first controllable switch are clamped in the stress voltage range, so that the second controllable switch is not damaged.
In addition, the application also considers that the output voltage oscillates at the zero crossing point when the output voltage of the inverter is the midpoint zero voltage, and the switching states of the first controllable switch to the fourth controllable switch are unstable, so that the sixth controllable switch and the second controllable switch are controlled to be both switched on when the output voltage oscillates between the first preset threshold and the second preset threshold in the application, and the voltages at two ends of the second controllable switch and the third controllable switch can be guaranteed to be clamped to be half of the input voltage no matter whether the output voltage of the inverter is positive or negative, so that the stability of the inverter is further improved.
In the present application, the switching states of the other controllable switches in the inverter are not particularly limited as long as the function of the three-level output of the inverter can be satisfied. The specific values of the first preset threshold and the second preset threshold are not particularly limited, as long as the first preset threshold is a positive number and the second preset threshold is a negative number.
In summary, the present invention provides a control method for an ANPC-type inverter, wherein when the output voltage of the ANPC-type inverter is positive, that is, the third controllable switch is turned off, the sixth controllable switch is controlled to be turned on, so that the voltage at two ends of the third controllable switch is clamped to be one half of the input voltage, thereby avoiding the situation that the voltage at two ends of the third controllable switch is too large and further exceeds the stress voltage to cause damage; when the output voltage of the ANPC type inverter is negative, namely the second controllable switch is disconnected, the fifth controllable switch is controlled to be connected, so that the voltages at two ends of the second controllable switch are clamped to be one half of the input voltage, and the situation that the voltages at two ends of the second controllable switch are too large and then exceed the stress voltage to cause damage is avoided; when the output voltage oscillates between the first preset threshold and the second preset threshold, that is, the output voltage oscillates near the zero crossing point, in order to ensure that the second controllable switch and the third controllable switch are not damaged, the sixth controllable switch and the fifth controllable switch are controlled to be conducted so that the voltage across the second controllable switch and the voltage across the third controllable switch are clamped to be one half of the input voltage, and the stability of the ANPC type inverter is further ensured.
On the basis of the above-described embodiment:
as a preferred embodiment, after the sixth controllable switch is controlled to be turned on when the output voltage of the ANPC type inverter is positive, the method further includes:
controlling the first controllable switch to be conducted at a first moment after the sixth controllable switch is conducted;
controlling the second controllable switch and the third controllable switch to be complementarily conducted at a first preset frequency at a second time after the first controllable switch is conducted;
controlling the second controllable switch and the third controllable switch to be disconnected at a third time after the second time;
controlling the first controllable switch to be switched off at a fourth moment after the second controllable switch and the third controllable switch are both switched off;
controlling the fifth controllable switch to be switched on at a fifth time after the first controllable switch is switched off;
the first moment to the fourth moment are all in the same positive half period of the output voltage, and the fifth moment is a moment corresponding to a zero crossing point when the output voltage enters a negative half period from the positive half period.
In order to further ensure the stability of the operation of the inverter, a switching strategy for other controllable switches in the inverter in the positive half period of the output voltage is given in the embodiment. Specifically, when the first controllable switch and the second controllable switch are in a conducting state, the output voltage of the inverter is in a positive half period, in the application, the first controllable switch is controlled to be conducted at a first time after the sixth controllable switch is conducted, then the second controllable switch and the third controllable switch are controlled to be complementarily conducted at a first preset frequency at a second time after the first controllable switch is conducted, it is ensured that the second controllable switch is controlled to be closed after the first controllable switch is completely conducted, and the output voltage of the inverter is gradually increased while the safety of the second controllable switch is ensured. At a fourth time after both the second controllable switch and the third controllable switch are turned off, the first controllable switch is controlled to turn off so that the output voltage enters a negative half-cycle. And the fifth controllable switch is controlled to be conducted at the fifth moment, namely the moment corresponding to the zero crossing point when the output voltage enters the negative half period from the positive half period, so that the safety of the second controllable switch and the third controllable switch when the output voltage oscillates at the zero crossing point is ensured.
It should be noted that, in the present application, the first time to the fourth time are all within the same positive half period of the output voltage, the present application is not particularly limited to the time intervals of the phase difference between the times, and the time intervals of the phase difference between the times may be different from each other. In addition, the present application does not limit the value of the first preset frequency, and the first preset frequency in the present application is not always fixed, and the first preset frequency may be increased and then decreased within the positive half period of the output voltage. In the present embodiment, the switching strategy of the inverter in the negative half cycle is not particularly limited, and may be controlled according to actual conditions.
As a preferred embodiment, after controlling the fifth controllable switch to be turned on when the output voltage is negative, the method further includes:
controlling the sixth controllable switch to be switched off at a sixth moment after the fifth controllable switch is switched on;
controlling the fourth controllable switch to be switched on at a seventh moment after the sixth controllable switch is switched off;
controlling the second controllable switch and the third controllable switch to be complementarily conducted at a second preset frequency at an eighth moment after the fourth controllable switch is conducted;
and the sixth moment, the seventh moment and the eighth moment are all in the same negative half period of the output voltage.
In order to further ensure the stability of the operation of the inverter, a switching strategy for the other controllable switches in the inverter during the negative half-cycle of the output voltage is given in this embodiment. Referring to fig. 3, fig. 3 is a waveform diagram of a driving signal of an ANPC-type inverter according to the present invention, where U in fig. 3 represents an output voltage, S1 to S6 sequentially represent driving signals corresponding to a first controllable switch to a sixth controllable switch, and t represents time.
Specifically, when the third controllable switch and the fourth controllable switch are in a conducting state, the output voltage of the inverter is in a negative half period, the sixth controllable switch is controlled to be turned off at the sixth moment after the fifth controllable switch is controlled to be turned on in the application, and the fifth controllable switch and the sixth controllable switch are both turned on when the output voltage oscillates at the zero crossing, so that the safety of the second controllable switch and the third controllable switch is ensured. And controlling the fourth controllable switch to be firstly conducted at a seventh moment after the sixth controllable switch is switched off in order to enable the output voltage of the inverter to enter a negative half cycle, and controlling the third controllable switch and the second controllable switch to be complementarily conducted at a second preset frequency at an eighth moment after the fourth controllable switch is completely conducted so that the inverter completes output in a complete cycle.
It should be noted that, the present application does not limit the specific value of the second preset frequency, the second preset frequency may be equal to the first preset frequency, and the second preset frequency may also be shifted in the negative half period of the output voltage. In addition, the sixth time to the eighth time in this embodiment are all within the same negative half period of the output voltage, but the time intervals of the phase difference between the times are not particularly limited in this embodiment, and the time intervals of the phase difference between the times may be different from each other.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a control system of an ANPC-type inverter provided in the present application, where the ANPC-type inverter includes a first capacitor, a second capacitor, first to sixth controllable switches, and diodes connected in anti-parallel with the controllable switches; the first controllable switch, the second controllable switch, the third controllable switch and the fourth controllable switch are sequentially connected in series, a circuit formed by connecting the first controllable switch, the second controllable switch, the third controllable switch and the fourth controllable switch in series is connected in parallel with a circuit formed by connecting the first capacitor and the second capacitor in series, the common end connected with the first capacitor and the second capacitor is respectively connected with the output end of the fifth controllable switch and the input end of the sixth controllable switch, the common end connected with the first controllable switch and the second controllable switch is connected with the input end of the fifth controllable switch, and the common end connected with the third controllable switch and the fourth controllable switch is connected with the output end of the sixth controllable switch;
the control system of an ANPC type inverter includes:
a first control unit 11, configured to control the sixth controllable switch to be turned on when the output voltage of the ANPC-type inverter is positive, and to control the fifth controllable switch to be turned on when the output voltage is negative;
and the second control unit 12 is configured to control the sixth controllable switch and the fifth controllable switch to be both turned on when the output voltage oscillates between a first preset threshold and a second preset threshold, where the first preset threshold is a positive number, and the second preset threshold is a negative number.
For a related introduction of the control system of the ANPC-type inverter provided in the present application, please refer to the above-mentioned embodiment of the control method of the ANPC-type inverter, which is not described herein again.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a control device of an ANPC-type inverter according to the present application, the control device of the ANPC-type inverter includes:
a memory 21 for storing a computer program;
a processor 22 for implementing the steps of the control method of the ANPC-type inverter described above when executing a computer program.
For a related introduction of a control apparatus of an ANPC-type inverter provided in the present application, please refer to the above-mentioned embodiment of the control method of the ANPC-type inverter, which is not described herein again.
The application also provides an ANPC inverter, which comprises the control device of the ANPC inverter, a first capacitor, a second capacitor, first to sixth controllable switches and diodes in inverse parallel connection with the controllable switches;
the first controllable switch, the second controllable switch, the third controllable switch and the fourth controllable switch are sequentially connected in series, a circuit formed by connecting the first controllable switch, the second controllable switch, the third controllable switch and the fourth controllable switch in series is connected in parallel with a circuit formed by connecting the first capacitor and the second capacitor in series, a common end connected with the first capacitor and the second capacitor is respectively connected with an output end of the fifth controllable switch and an input end of the sixth controllable switch, a common end connected with the first controllable switch and the second controllable switch is connected with an input end of the fifth controllable switch, and a common end connected with the third controllable switch and the fourth controllable switch is connected with an output end of the sixth controllable switch.
For a related introduction of the ANPC-type inverter provided in the present application, please refer to the above-mentioned embodiment of the control method of the ANPC-type inverter, which is not described herein again.
On the basis of the above-described embodiment:
as a preferred embodiment, further comprising an inductance connected to the common terminal to which the second controllable switch and the third controllable switch are connected.
In order to stabilize the output voltage of the inverter, in this embodiment, an inductor is further disposed at the output end of the inverter, that is, at the common end where the second controllable switch and the third controllable switch are connected, and the inductor can filter the output voltage of the inverter, so as to optimize the working performance of the inverter.
As a preferred embodiment, the second controllable switch and the third controllable switch are MOS transistors or silicon carbide MOS transistors, and the first controllable switch, the fourth controllable switch, the fifth controllable switch and the sixth controllable switch are all IGBTs.
Referring to fig. 6, fig. 6 is a schematic circuit diagram of an ANPC inverter according to the present invention, in fig. 6, C1 is a first capacitor, C2 is a second capacitor, S1 to S6 respectively represent a first controllable switch to a sixth controllable switch, D1 to D6 respectively represent diodes connected in anti-parallel between S1 and S6, and IL is an output current. Considering that all the controllable switches in the prior art ANPC-type inverter are generally IGBTs, the switching frequency of each controllable switch is relatively low due to the limitation of the IGBTs themselves, and generally the frequency of each switch is below 20KHZ, which causes the power density of the inductor connected to the output terminal of the inverter (the common terminal where the second controllable switch is connected to the third controllable switch) to be relatively low and the volume to be relatively large.
The power density and volume of the inductor connected to the output end of the inverter mainly depend on the frequency of the output current of the inverter, which in turn depends on the controllable switch with the highest switching frequency in the inverter, so in this embodiment, MOS transistors with higher sustainable switching frequency or silicon carbide MOS transistors are selected as the second controllable switch and the third controllable switch, thereby reducing the volume of the inductor and increasing the power density of the inductor.
As a preferred embodiment, the switching frequencies of the first controllable switch, the fourth controllable switch, the fifth controllable switch and the sixth controllable switch are all power frequencies, and the switching frequencies of the second controllable switch and the third controllable switch are all greater than the rated switching frequency of the IGBT.
Considering that all the controllable switches in the prior art ANPC-type inverter are generally IGBTs, and the switching frequency of the first controllable switch, the fourth controllable switch, the fifth controllable switch and the sixth controllable switch is 16KHZ, and the switching frequency of the second controllable switch and the third controllable switch is 50HZ, it can be seen that the overall switching loss of the prior art inverter is relatively large.
In the application, the second controllable switch and the third controllable switch are MOS transistors or silicon carbide MOS transistors with higher bearable switching frequencies, so that the switching frequencies of the second controllable switch and the third controllable switch are set to be higher than the switching frequency of the rated switching frequency of the IGBT, but the switching frequencies of the other controllable switches, namely the first controllable switch, the fourth controllable switch, the fifth controllable switch and the sixth controllable switch, are all power frequencies, and the switching loss of the inverter is reduced as a whole.
The present application also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the above-described method of controlling an ANPC-type inverter.
For a related introduction of a computer readable storage medium provided in the present application, please refer to the above-mentioned embodiment of the control method of the ANPC-type inverter, which is not described herein again.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed in the embodiment corresponds to the method disclosed in the embodiment, so that the description is simple, and the relevant points can be referred to the description of the method part.
It should also be noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
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 (9)

1. A control method of an ANPC type inverter is characterized in that the ANPC type inverter comprises a first capacitor, a second capacitor, first to sixth controllable switches and diodes which are connected with the controllable switches in an anti-parallel mode; the first controllable switch, the second controllable switch, the third controllable switch and the fourth controllable switch are sequentially connected in series, a circuit formed by connecting the first controllable switch, the second controllable switch, the third controllable switch and the fourth controllable switch in series is connected in parallel with a circuit formed by connecting the first capacitor and the second capacitor in series, a common end connected with the first capacitor and the second capacitor is respectively connected with an output end of a fifth controllable switch and an input end of a sixth controllable switch, a common end connected with the first controllable switch and the second controllable switch is connected with an input end of the fifth controllable switch, and a common end connected with the third controllable switch and the fourth controllable switch is connected with an output end of the sixth controllable switch;
the control method of the ANPC type inverter includes:
when the output voltage of the ANPC type inverter is positive, the sixth controllable switch is controlled to be conducted, and when the output voltage is negative, the fifth controllable switch is controlled to be conducted;
when the output voltage oscillates between a first preset threshold and a second preset threshold, controlling the sixth controllable switch and the fifth controllable switch to be both switched on, wherein the first preset threshold is a positive number, and the second preset threshold is a negative number;
after the output voltage of the ANPC-type inverter is positive and the sixth controllable switch is controlled to be turned on, the method further comprises:
controlling the first controllable switch to be turned on at a first time after the sixth controllable switch is turned on;
controlling the second controllable switch and the third controllable switch to be complementarily conducted at a first preset frequency at a second moment after the first controllable switch is conducted;
controlling the second controllable switch and the third controllable switch to be disconnected at a third time after the second time;
controlling the first controllable switch to be switched off at a fourth time after the second controllable switch and the third controllable switch are both switched off;
controlling the fifth controllable switch to be switched on at a fifth moment after the first controllable switch is switched off;
the first time to the fourth time are all within the same positive half period of the output voltage, and the fifth time is a time corresponding to a zero-crossing point when the output voltage enters a negative half period from the positive half period.
2. The method of controlling an ANPC-type inverter of claim 1, further comprising, after controlling the fifth controllable switch to conduct when the output voltage is negative:
controlling the sixth controllable switch to be switched off at a sixth moment after the fifth controllable switch is switched on;
controlling the fourth controllable switch to be switched on at a seventh moment after the sixth controllable switch is switched off;
controlling the second controllable switch and the third controllable switch to be complementarily conducted at a second preset frequency at an eighth moment after the fourth controllable switch is conducted;
wherein the sixth time, the seventh time, and the eighth time are all within the same negative half-cycle of the output voltage.
3. A control system of an ANPC inverter is characterized in that the ANPC inverter comprises a first capacitor, a second capacitor, first to sixth controllable switches and diodes connected with the controllable switches in anti-parallel; the first controllable switch, the second controllable switch, the third controllable switch and the fourth controllable switch are sequentially connected in series, a circuit formed by connecting the first controllable switch, the second controllable switch, the third controllable switch and the fourth controllable switch in series is connected in parallel with a circuit formed by connecting the first capacitor and the second capacitor in series, a common end connected with the first capacitor and the second capacitor is respectively connected with an output end of a fifth controllable switch and an input end of a sixth controllable switch, a common end connected with the first controllable switch and the second controllable switch is connected with an input end of the fifth controllable switch, and a common end connected with the third controllable switch and the fourth controllable switch is connected with an output end of the sixth controllable switch;
the control system of the ANPC type inverter includes:
a first control unit for controlling the sixth controllable switch to be turned on when the output voltage of the ANPC type inverter is positive and controlling the fifth controllable switch to be turned on when the output voltage is negative;
the second control unit is used for controlling the sixth controllable switch and the fifth controllable switch to be conducted when the output voltage oscillates between a first preset threshold and a second preset threshold, wherein the first preset threshold is a positive number, and the second preset threshold is a negative number;
the first control unit is further used for controlling the first controllable switch to be conducted at a first moment after the sixth controllable switch is conducted after the sixth controllable switch is controlled to be conducted when the output voltage of the ANPC type inverter is positive;
controlling the second controllable switch and the third controllable switch to be complementarily conducted at a first preset frequency at a second moment after the first controllable switch is conducted;
controlling the second controllable switch and the third controllable switch to be disconnected at a third time after the second time;
controlling the first controllable switch to be switched off at a fourth time after the second controllable switch and the third controllable switch are both switched off;
controlling the fifth controllable switch to be switched on at a fifth moment after the first controllable switch is switched off;
the first time to the fourth time are all within the same positive half period of the output voltage, and the fifth time is a time corresponding to a zero-crossing point when the output voltage enters a negative half period from the positive half period.
4. A control device of an ANPC type inverter, comprising:
a memory for storing a computer program;
processor for implementing the steps of a method for controlling an ANPC inverter according to claim 1 or 2, when said computer program is executed.
5. An ANPC inverter, comprising control means for the ANPC inverter as claimed in claim 4, further comprising a first capacitor, a second capacitor, first through sixth controllable switches, and diodes connected in anti-parallel with the controllable switches;
the first controllable switch, the second controllable switch, the third controllable switch and the fourth controllable switch are sequentially connected in series, a circuit after the first controllable switch, the second controllable switch, the third controllable switch and the fourth controllable switch are connected in series is connected in parallel with a circuit after the first capacitor and the second capacitor are connected in series, a common end connected with the first capacitor and the second capacitor is respectively connected with an output end of the fifth controllable switch and an input end of the sixth controllable switch, a common end connected with the first controllable switch and the second controllable switch is connected with an input end of the fifth controllable switch, and a common end connected with the third controllable switch and the fourth controllable switch is connected with an output end of the sixth controllable switch.
6. An ANPC-type inverter as claimed in claim 5, further comprising a filter inductance connected to a common terminal to which the second controllable switch and the third controllable switch are connected.
7. The ANPC inverter of claim 5, wherein the second controllable switch and the third controllable switch are MOS transistors or silicon carbide MOS transistors, and wherein the first controllable switch, the fourth controllable switch, the fifth controllable switch, and the sixth controllable switch are all IGBTs.
8. The ANPC-type inverter of claim 7, wherein the switching frequencies of the first controllable switch, the fourth controllable switch, the fifth controllable switch, and the sixth controllable switch are all at power frequency, and wherein the switching frequencies of the second controllable switch and the third controllable switch are each greater than a rated switching frequency of the IGBT.
9. A computer-readable storage medium, characterized in that it has stored thereon a computer program which, when being executed by a processor, carries out the steps of a method of controlling an inverter of the ANPC type according to claim 1 or 2.
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