CN109103850B - Storage medium, and short-circuit protection control method, device and system of bidirectional power converter - Google Patents
Storage medium, and short-circuit protection control method, device and system of bidirectional power converter Download PDFInfo
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- CN109103850B CN109103850B CN201811241734.3A CN201811241734A CN109103850B CN 109103850 B CN109103850 B CN 109103850B CN 201811241734 A CN201811241734 A CN 201811241734A CN 109103850 B CN109103850 B CN 109103850B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
- H02H7/1257—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers responsive to short circuit or wrong polarity in output circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
Abstract
The invention provides a storage medium, and a short-circuit protection control method, device and system of a bidirectional power converter, and relates to the technical field of power electronics. When the current value of the output end is larger than a preset protection current threshold value and the voltage value of the output end is smaller than or equal to a preset first protection voltage threshold value, all controllable switch tubes contained in the AC/DC converter and all controllable switch tubes contained in the DC/DC converter are controlled to be closed, and when the current bus voltage value is larger than a preset second protection voltage threshold value, all controllable switch tubes of the DC/DC converter are controlled to be opened, so that the energy of the bus voltage is transmitted to the DC/DC converter side according to the flow direction transmitted from the AC/DC converter side to the DC/DC converter side and is released, and the capacitor of the output end and the controllable switch tubes hung at the output end are protected from being damaged.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a storage medium, and a short-circuit protection control method, device and system of a bidirectional power converter.
Background
For bidirectional power converters, two-stage power conversion is generally included, namely AC/DC and DC/DC power conversion; bidirectional power conversion can realize energy forward flow (defining the flow of energy transmitted from the AC/DC converter side to the DC/DC converter side) and also realize energy reverse flow. Then both AC/DC and DC/DC converters are required to be able to realize bidirectional energy conversion.
In the process of energy reverse flow (energy reverse flow refers to the energy flow direction of taking power from a battery and transmitting power to an AC side AC load), when a short-circuit fault occurs on the AC side, the conventional protection strategy is that a controller closes all controllable switching tubes to drive by judging that the inductive current exceeds a set current threshold, at this moment, because of the short-circuit moment, the fluctuation of the current flowing through the AC side inductor is very large, the energy stored in the inductor flows back to a bus through a follow current loop through a first controllable switching tube/a fourth controllable switching tube or a second controllable switching tube/a third controllable switching tube in an anti-parallel connection diode, the energy stored in the inductor flows back to the bus through the follow current loop, the bus voltage is increased, and the influence caused by the increase of the bus voltage is as follows: on the one hand, the two ends of the bus capacitor are withstand voltage and exceed the voltage nominal value of the capacitor, on the other hand, the voltage at the two ends of the switching tube which is connected with the bus in a hanging mode exceeds the voltage nominal value of the switching tube, and therefore the capacitor at the output end and the controllable switching tube connected with the output end in a hanging mode can be damaged.
Disclosure of Invention
It is therefore an object of the present invention to provide a storage medium, a method, an apparatus and a system for controlling short-circuit protection of a bidirectional power converter, so as to improve the above-mentioned problems.
In a first aspect, an embodiment of the present invention provides a short-circuit protection control method for a bidirectional power converter, where the bidirectional power converter includes an AC/DC converter and a DC/DC converter, and the short-circuit protection control method for the bidirectional power converter includes:
obtaining a current value and a voltage value of an output end of the AC/DC converter side in a process that power of a bidirectional power converter is transmitted from the DC/DC converter side to the AC/DC converter side;
when the current value of the output end is larger than a preset protection current threshold value and the voltage value of the output end is smaller than or equal to a preset first protection voltage threshold value, controlling all controllable switching tubes contained in the AC/DC converter and all controllable switching tubes contained in the DC/DC converter to be closed;
detecting whether the bus voltage is less than or equal to a preset second protection voltage threshold value or not;
and when the current bus voltage value is larger than a preset second protection voltage threshold value, controlling all controllable switch tubes of the DC/DC converter to be switched on, so that the energy of the bus voltage is transmitted to the DC/DC converter side to be released according to the flow direction transmitted from the AC/DC converter side to the DC/DC converter side.
In a second aspect, an embodiment of the present invention further provides a short-circuit protection control device for a bidirectional power converter, where the bidirectional power converter includes an AC/DC converter and a DC/DC converter, and the short-circuit protection control device for the bidirectional power converter includes:
an information obtaining unit configured to obtain a current value and a voltage value of an output terminal of the AC/DC converter side in a process in which power of a bidirectional power converter is transmitted from the DC/DC converter side to the AC/DC converter side;
the control unit is used for controlling all controllable switching tubes contained in the AC/DC converter and all controllable switching tubes contained in the DC/DC converter to be closed when the current value of the output end is greater than a preset protection current threshold value and the voltage value of the output end is less than or equal to a preset first protection voltage threshold value;
the detection unit is used for detecting whether the bus voltage is less than or equal to a preset second protection voltage threshold value or not;
the control unit is further configured to control all controllable switching tubes of the DC/DC converter to be turned on when the current bus voltage value is greater than a preset second protection voltage threshold value, so that the energy of the bus voltage is transmitted to the DC/DC converter side in the flow direction from the AC/DC converter side to the DC/DC converter side and is released.
In a third aspect, an embodiment of the present invention further provides a short-circuit protection control system for a bidirectional power converter, where the short-circuit protection control system for the bidirectional power converter includes a main control board, a driving circuit, a voltage acquisition module, a current acquisition module, a DC/DC converter, and an AC/DC converter, the main control board is electrically connected to the driving circuit, the voltage acquisition module, and the current acquisition module respectively, the driving circuit is electrically connected to the DC/DC converter and the AC/DC converter respectively, the DC/DC converter is electrically connected to the AC/DC converter,
the voltage acquisition module is used for acquiring a voltage value of an output end of the AC/DC converter side;
the current acquisition module is used for acquiring the current value of the output end of the AC/DC converter side;
the main control board is used for obtaining a current value and a voltage value of an output end of the AC/DC converter side in the process that the power of the bidirectional power converter is transmitted from the DC/DC converter side to the AC/DC converter side, and controlling the driving circuit to drive all controllable switch tubes contained in the AC/DC converter and all controllable switch tubes contained in the DC/DC converter to be closed when the current value of the output end is larger than a preset protection current threshold value and the voltage value of the output end is smaller than or equal to a preset first protection voltage threshold value; detecting whether the bus voltage is less than or equal to a preset second protection voltage threshold value or not; and when the current bus voltage value is larger than a preset second protection voltage threshold value, controlling the driving circuit to drive all controllable switching tubes of the DC/DC converter to be switched on, so that the energy of the bus voltage is transmitted to the DC/DC converter side to be released according to the flow direction transmitted from the AC/DC converter side to the DC/DC converter side.
In a fourth aspect, the embodiment of the present invention further provides a storage medium, in which computer instructions are stored, where the computer instructions, when read and executed, perform the short-circuit protection control method for a bidirectional power converter as described above.
Compared with the prior art, the short-circuit protection control method, the short-circuit protection control device and the short-circuit protection control system for the storage medium and the bidirectional power converter provided by the invention have the advantages that when the current value of the output end is greater than the preset protection current threshold value and the voltage value of the output end is less than or equal to the preset first protection voltage threshold value, all the controllable switching tubes contained in the AC/DC converter and all the controllable switching tubes contained in the DC/DC converter are controlled to be closed; when the current bus voltage value is larger than the preset second protection voltage threshold value, all controllable switch tubes of the DC/DC converter are controlled to be switched on, so that the energy of the bus voltage is transmitted to the DC/DC converter side according to the flowing direction transmitted from the AC/DC converter side to the DC/DC converter side to be released, the withstand voltage at the two ends of the bus capacitor cannot exceed the capacitor voltage nominal value, the voltage at the two ends of the controllable switch tubes connected to the output end cannot exceed the voltage nominal value of the switch tubes, and the output end capacitor and the controllable switch tubes connected to the output end in a hanging mode are protected from being damaged.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
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. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the 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.
Fig. 1 is a flowchart of a short-circuit protection control method for a bidirectional power converter according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a bidirectional power converter provided by an embodiment of the present invention;
fig. 3 is a functional block diagram of a short-circuit protection control device of a bidirectional power converter according to an embodiment of the present invention;
fig. 4 is a circuit connection block diagram of a short-circuit protection control system of a bidirectional power converter according to an embodiment of the present invention.
Icon: 201-main control panel; 202-a drive circuit; 203-a voltage acquisition module; 204-a current collection module; 205-AC/DC converter; 206-DC/DC converter; 301-an information obtaining unit; 302-a detection unit; 303-control unit.
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. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an embodiment of the invention provides a short-circuit protection control method for a bidirectional power converter, which is applied to a main control board 201. As shown in fig. 2, the bidirectional power converter includes an AC/DC converter 205 and a DC/DC converter 206, the AC/DC converter 205 is electrically connected to the DC/DC converter 206, wherein the AC/DC converter 205 includes a ninth controllable switching tube Q9, a tenth controllable switching tube Q10, an eleventh controllable switching tube Q11, and a twelfth controllable switching tube Q12, and the ninth controllable switching tube Q9 and the tenth controllable switching tube Q10 are located on the same bridge arm; the eleventh controllable switching tube Q11 and the twelfth controllable switching tube Q12 are located on the same bridge arm, the ninth controllable switching tube Q9 and the eleventh controllable switching tube Q11 form a first loop of the AC/DC converter 205 when being conducted, the control logics are consistent, the tenth controllable switching tube Q10 and the twelfth controllable switching tube Q12 form a second loop of the AC/DC converter 205 when being conducted, the control logics are consistent, the input end of the AC/DC converter 205 is connected in series with a first capacitor, the output end of the AC/DC converter 205 is connected with a bus capacitor C1, the voltage at two ends of the bus capacitor C1 is bus voltage, and the input end of the AC/DC converter 205 is connected to the power grid.
The DC/DC converter 206 is a bidirectional resonant circuit, the DC/DC converter 206 includes a bidirectional resonant circuit including a first controllable switching tube Q1, a second controllable switching tube Q2, a third controllable switching tube Q3 and a fourth controllable switching tube Q4 on the primary side, and includes a fifth controllable switching tube Q5, a sixth controllable switching tube Q6, a seventh controllable switching tube Q7 and an eighth controllable switching tube Q8 on the secondary side, wherein the fifth controllable switching tube Q5 and the sixth controllable switching tube Q6 on the secondary side are located on the same bridge arm, and the seventh controllable switching tube Q7 and the eighth controllable switching tube Q8 are located on the same bridge arm; the first controllable switch tube Q1 and the second controllable switch tube Q2 on the original side are located on the same arm, and the third controllable switch tube Q3 and the fourth controllable switch tube Q4 on the original side are also located on the same arm. The driving time sequence logics of the first controllable switch tube Q1 and the third controllable switch tube Q3 on the primary side are consistent, and the driving time sequence logics of the second controllable switch tube Q2 and the fourth controllable switch tube Q4 are consistent; the driving time sequence logics of the fifth controllable switch tube Q5 and the seventh controllable switch tube Q7 on the secondary side are consistent, the driving time sequence logics of the sixth controllable switch tube Q6 and the eighth controllable switch tube Q8 are consistent, a first loop on the primary side is formed when the first controllable switch tube Q1 and the third controllable switch tube Q3 on the primary side are both switched on, and a second loop on the primary side is formed when the second controllable switch tube Q2 and the fourth controllable switch tube Q4 on the primary side are both switched on; when the fifth controllable switch tube Q5 and the seventh controllable switch tube Q7 on the secondary side are both turned on, a first loop on the secondary side is formed, when the sixth controllable switch tube Q6 and the eighth controllable switch tube Q8 on the secondary side are both turned on, a second loop on the secondary side is formed, the output end of the DC/DC converter 206 is connected with a second capacitor, and the output end of the DC/DC converter 206 is connected with a battery. A resonant cavity formed by a third capacitor Cr and an inductor L3 is connected between the primary side and the secondary side of the DC/DC converter 206. The short-circuit protection control method of the bidirectional power converter comprises the following steps:
step S101: in the process of transmitting the power of the bidirectional power converter from the DC/DC converter 206 side to the AC/DC converter 205 side, the current value and the voltage value of the output terminal of the AC/DC converter 205 are obtained.
In this embodiment, the current collecting module 204 may be used to collect the current flowing through the output end of the AC/DC converter 205 and transmit the current to the main control board 201; the voltage of the output terminal of the AC/DC converter 205 may be collected by the voltage collecting module 203 and transmitted to the main control board 201.
Step S102: and detecting whether the current value of the output end is larger than a preset protection current threshold value and whether the voltage value of the output end is smaller than or equal to a preset first protection voltage threshold value, if so, executing the step S103, and if not, executing the step S108.
Whether the AC/DC converter 205 is short-circuited is determined by measuring two determination conditions of whether the current value of the output end is greater than a preset protection current threshold value and whether the voltage value of the output end is less than or equal to a preset first protection voltage threshold value, and when the current value of the output end is greater than the preset protection current threshold value and the voltage value of the output end is less than or equal to the preset first protection voltage threshold value, the output end of the AC/DC converter 205 is short-circuited.
Step S103: all controllable switches included in the AC/DC converter 205 and all controllable switches included in the DC/DC converter 206 are controlled to be turned off.
All the controllable switch tubes included in the AC/DC converter 205 and all the controllable switch tubes included in the DC/DC converter 206 are turned off, so that the AC/DC converter 205 and the DC/DC converter 206 can be in a non-operating state, and thus, device damage caused by short circuit of the output ends of the AC/DC converter 205 and the DC/DC converter 206 can be avoided to a certain extent.
Considering that after all the controllable switch tubes are closed, the bus voltage may be increased or caused by the energy backflow of the resonant cavity of the bidirectional power converter, and therefore, the short-circuit protection control method of the bidirectional power converter further comprises the following steps:
step S104: and detecting whether the bus voltage value is less than or equal to a preset second protection voltage threshold value, if not, executing the step S105, and if so, executing the step S108.
Step S105: and controlling all controllable switch tubes of the DC/DC converter 206 to be switched on, so that the energy of the bus voltage is transmitted to the DC/DC converter 206 to be released according to the flow direction transmitted from the AC/DC converter 205 side to the DC/DC converter 206.
At this time, in order to ensure that the bus voltage is not continuously raised, the controllable switching tube of the DC/DC converter 206 is controlled to enable, so that the energy of the bus voltage is fed back to the battery according to the control logic of the flow direction transmitted from the AC/DC converter side to the DC/DC converter side, thereby reducing the bus voltage to within the normal voltage amplitude.
If the bus voltage has not been safely reduced to within the normal voltage amplitude at this time, the short-circuit protection control method of the bidirectional power converter may further include:
step S106: detecting whether the current bus voltage value is less than or equal to a preset recovery threshold voltage, if not, executing the step S105, and continuing to control all controllable switching tubes of the DC/DC converter 206 to be switched on; if so, step S107 is performed.
Step S107: all controllable switching tubes of the DC/DC converter 206 are controlled to be closed.
Step S108: and controlling the bidirectional power converter to maintain the current running state to run.
Referring to fig. 3, an embodiment of the present invention further provides a short-circuit protection control device for a bidirectional power converter, it should be noted that the basic principle and the generated technical effect of the short-circuit protection control device for a bidirectional power converter provided in the embodiment of the present invention are the same as those of the foregoing embodiment, and for brief description, corresponding contents in the foregoing embodiment may be referred to where this embodiment is not mentioned in part. The bidirectional power converter includes an AC/DC converter 205 and a DC/DC converter 206, and the short-circuit protection control device of the bidirectional power converter includes an information obtaining unit 301, a detecting unit 302, and a control unit 303.
The information obtaining unit 301 is configured to obtain a current value and a voltage value at the output terminal of the AC/DC converter 205 in the process of transmitting the power of the bidirectional power converter from the DC/DC converter 206 side to the AC/DC converter 205 side.
The detection unit 302 is configured to detect that the current value of the output terminal is greater than a preset protection current threshold and the voltage value of the output terminal is less than or equal to a preset first protection voltage threshold.
The control unit 303 is configured to control the bidirectional power converter to maintain the current operation state when the current value of the current output terminal is less than or equal to the preset protection current threshold or the voltage value of the output terminal is greater than the preset first protection voltage threshold.
The control unit 303 is further configured to control all the controllable switches included in the AC/DC converter 205 and all the controllable switches included in the DC/DC converter 206 to be turned off when the current value of the output terminal is greater than the preset protection current threshold and the voltage value of the output terminal is less than or equal to the preset first protection voltage threshold.
The detecting unit 302 is configured to detect whether the bus voltage value is greater than a preset second protection voltage threshold.
The control unit 303 is further configured to control all the controllable switching tubes of the DC/DC converter 206 to be turned on when the bus voltage value is greater than the preset second protection voltage threshold value, so that the energy of the bus voltage is transmitted to the DC/DC converter 206 side and released according to the flow direction transmitted from the AC/DC converter 205 side to the DC/DC converter 206 side.
After the step of controlling all the controllable switching tubes of the DC/DC converter 206 to be turned on, the detecting unit 302 is further configured to detect whether the current bus voltage value is less than or equal to the recovery threshold voltage. The control unit 303 is further configured to continue to control all the controllable switching tubes of the DC/DC converter 206 to be turned on when the current bus voltage value is greater than the recovery threshold voltage.
After the step of controlling all the controllable switching tubes of the DC/DC converter 206 to be turned on, the detecting unit 302 is further configured to detect whether the current bus voltage value is less than or equal to the recovery threshold voltage; the control unit 303 is further configured to control all controllable switching tubes of the DC/DC converter 206 to be turned off when the current bus voltage value is less than or equal to the recovery threshold voltage.
Referring to fig. 4, an embodiment of the present invention further provides a short-circuit protection control system for a bidirectional power converter, it should be noted that the basic principle and the generated technical effect of the short-circuit protection control system for a bidirectional power converter provided in the embodiment of the present invention are the same as those of the foregoing embodiment, and for brief description, corresponding contents in the foregoing embodiment may be referred to where this embodiment is not mentioned in part. The short-circuit protection control system of the bidirectional power converter comprises a main control board 201, a driving circuit 202, a voltage acquisition module 203, a current acquisition module 204, a DC/DC converter 206 and an AC/DC converter 205, wherein the main control board 201 is electrically connected with the driving circuit 202, the voltage acquisition module 203 and the current acquisition module 204 respectively, the driving circuit 202 is electrically connected with the DC/DC converter 206 and the AC/DC converter 205 respectively, and the DC/DC converter 206 is electrically connected with the AC/DC converter 205.
The voltage collecting module 203 is used for collecting a voltage value at an output end of the AC/DC converter 205.
The current collecting module 204 is used for collecting a current value at an output end of the AC/DC converter 205.
The main control board 201 is configured to obtain a current value and a voltage value of an output end of the AC/DC converter 205 side in a process that power of the bidirectional power converter is transmitted from the DC/DC converter 206 side to the AC/DC converter 205 side, and when the current value of the output end is greater than a preset protection current threshold and the voltage value of the output end is less than or equal to a preset first protection voltage threshold, control the driving circuit 202 to drive all controllable switch tubes included in the AC/DC converter 205 and all controllable switch tubes included in the DC/DC converter 206 to be turned off; detecting whether the bus voltage value is less than or equal to a preset second protection voltage threshold value or not; when the current bus voltage value is greater than the preset second protection voltage threshold value, the control driving circuit 202 drives all controllable switch tubes of the DC/DC converter 206 to be turned on, so that the energy of the bus voltage is transmitted to the DC/DC converter 206 in the flow direction from the AC/DC converter 205 side to the DC/DC converter 206 side and is released.
The embodiment of the invention also provides a storage medium, wherein a computer instruction is stored in the storage medium, and when the computer instruction is read and operated, the computer instruction executes the above short-circuit protection control method for implementing the bidirectional power converter.
In summary, according to the storage medium, the short-circuit protection control method, the short-circuit protection control device, and the short-circuit protection control system for the bidirectional power converter provided by the present invention, when the current value of the output terminal is greater than the preset protection current threshold and the voltage value of the output terminal is less than or equal to the preset first protection voltage threshold, all the controllable switching tubes included in the AC/DC converter and all the controllable switching tubes included in the DC/DC converter are controlled to be turned off; when the bus voltage value is greater than the preset second protection voltage threshold value, all the controllable switch tubes of the DC/DC converter 206 are controlled to be turned on, so that the energy of the bus voltage is transmitted to the DC/DC converter 206 in the flow direction from the AC/DC converter 205 side to the DC/DC converter 206 side and released, and thus, the withstand voltage at the two ends of the bus capacitor does not exceed the capacitor voltage nominal value, and the voltage at the two ends of the controllable switch tubes connected to the output end does not exceed the voltage nominal value of the switch tubes, thereby protecting the output end capacitor and the controllable switch tubes connected to the output end from being damaged.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes. It is noted that, herein, relational terms such as first and second, and the like may be 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 phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
Claims (10)
1. A short-circuit protection control method of a bidirectional power converter is characterized in that the bidirectional power converter comprises an AC/DC converter and a DC/DC converter, a bus capacitor is connected to the output end of the AC/DC converter, the voltage at two ends of the bus capacitor is bus voltage, and the short-circuit protection control method of the bidirectional power converter comprises the following steps:
obtaining a current value and a voltage value of an output end of the AC/DC converter side in a process that power of a bidirectional power converter is transmitted from the DC/DC converter side to the AC/DC converter side;
when the current value of the output end is larger than a preset protection current threshold value and the voltage value of the output end is smaller than or equal to a preset first protection voltage threshold value, controlling all controllable switching tubes contained in the AC/DC converter and all controllable switching tubes contained in the DC/DC converter to be closed;
detecting whether the bus voltage is less than or equal to a preset second protection voltage threshold value or not;
and when the current bus voltage value is larger than a preset second protection voltage threshold value, controlling all controllable switch tubes of the DC/DC converter to be switched on, so that the energy of the bus voltage is transmitted to the DC/DC converter side to be released according to the flow direction transmitted from the AC/DC converter side to the DC/DC converter side.
2. The short-circuit protection control method of the bidirectional power converter according to claim 1, wherein after the step of controlling all controllable switching tubes of the DC/DC converter to be turned on, the short-circuit protection control method of the bidirectional power converter further comprises:
detecting whether the current bus voltage value is less than or equal to a preset recovery threshold voltage or not;
and when the current bus voltage value is larger than the preset recovery threshold voltage, continuously controlling all the controllable switching tubes of the DC/DC converter to be switched on.
3. The short-circuit protection control method of the bidirectional power converter according to claim 1, wherein after the step of controlling all controllable switching tubes of the DC/DC converter to be turned on, the short-circuit protection control method of the bidirectional power converter further comprises:
detecting whether the current bus voltage value is less than or equal to a preset recovery threshold voltage or not;
and when the current bus voltage value is less than or equal to the preset recovery threshold voltage, controlling all controllable switching tubes of the DC/DC converter to be closed.
4. The short-circuit protection control method of a bidirectional power converter according to claim 1, further comprising:
and when the current value of the current output end is less than or equal to a preset protection current threshold value or the voltage value of the current output end is greater than a preset first protection voltage threshold value, controlling the bidirectional power converter to maintain the current running state to run.
5. A short-circuit protection control device of a bidirectional power converter is characterized in that the bidirectional power converter comprises an AC/DC converter and a DC/DC converter, a bus capacitor is connected to the output end of the AC/DC converter, the voltage at two ends of the bus capacitor is bus voltage, and the short-circuit protection control device of the bidirectional power converter comprises:
an information obtaining unit configured to obtain a current value and a voltage value of an output terminal of the AC/DC converter side in a process in which power of a bidirectional power converter is transmitted from the DC/DC converter side to the AC/DC converter side;
the control unit is used for controlling all controllable switching tubes contained in the AC/DC converter and all controllable switching tubes contained in the DC/DC converter to be closed when the current value of the output end is greater than a preset protection current threshold value and the voltage value of the output end is less than or equal to a preset first protection voltage threshold value;
the detection unit is used for detecting whether the bus voltage is less than or equal to a preset second protection voltage threshold value or not;
the control unit is further configured to control all controllable switching tubes of the DC/DC converter to be turned on when the current bus voltage value is greater than a preset second protection voltage threshold value, so that the energy of the bus voltage is transmitted to the DC/DC converter side in the flow direction from the AC/DC converter side to the DC/DC converter side and is released.
6. The short-circuit protection control device of the bidirectional power converter according to claim 5, wherein the detecting unit is further configured to detect whether the current bus voltage value is less than or equal to a preset recovery threshold voltage after the step of controlling all controllable switching tubes of the DC/DC converter to be turned on;
and the control unit is also used for continuously controlling all the controllable switching tubes of the DC/DC converter to be switched on when the current bus voltage value is greater than the preset recovery threshold voltage.
7. The short-circuit protection control device for a bidirectional power converter according to claim 5,
the detection unit is also used for detecting whether the current bus voltage value is less than or equal to the preset recovery threshold voltage or not after the step of controlling all the controllable switching tubes of the DC/DC converter to be switched on;
the control unit is also used for controlling all controllable switching tubes of the DC/DC converter to be closed when the current bus voltage value is less than or equal to the preset recovery threshold voltage.
8. The short-circuit protection control device of the bidirectional power converter according to claim 5, wherein the control unit is further configured to control the bidirectional power converter to maintain the current operation state when the current value of the output terminal is less than or equal to a preset protection current threshold value or the voltage value of the output terminal is greater than a preset first protection voltage threshold value.
9. A short-circuit protection control system of a bidirectional power converter is characterized by comprising a main control board, a driving circuit, a voltage acquisition module, a current acquisition module, a DC/DC converter and an AC/DC converter, wherein the main control board is respectively and electrically connected with the driving circuit, the voltage acquisition module and the current acquisition module, the driving circuit is respectively and electrically connected with the DC/DC converter and the AC/DC converter, the DC/DC converter is electrically connected with the AC/DC converter,
the voltage acquisition module is used for acquiring a voltage value of an output end of the AC/DC converter side;
the current acquisition module is used for acquiring the current value of the output end of the AC/DC converter side;
the main control board is used for obtaining a current value and a voltage value of an output end of the AC/DC converter side in the process that the power of the bidirectional power converter is transmitted from the DC/DC converter side to the AC/DC converter side, and controlling the driving circuit to drive all controllable switch tubes contained in the AC/DC converter and all controllable switch tubes contained in the DC/DC converter to be closed when the current value of the output end is larger than a preset protection current threshold value and the voltage value of the output end is smaller than or equal to a preset first protection voltage threshold value; detecting whether the bus voltage is less than or equal to a preset second protection voltage threshold value or not; and when the current bus voltage value is larger than a preset second protection voltage threshold value, controlling the driving circuit to drive all controllable switching tubes of the DC/DC converter to be switched on, so that the energy of the bus voltage is transmitted to the DC/DC converter side to be released according to the flow direction transmitted from the AC/DC converter side to the DC/DC converter side.
10. A storage medium having computer instructions stored thereon, wherein the computer instructions, when read and executed, perform a method of short circuit protection control of a bidirectional power converter as recited in any of claims 1-4.
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| CN201811241734.3A CN109103850B (en) | 2018-10-24 | 2018-10-24 | Storage medium, and short-circuit protection control method, device and system of bidirectional power converter |
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| US8860379B2 (en) * | 2011-04-20 | 2014-10-14 | GM Global Technology Operations LLC | Discharging a DC bus capacitor of an electrical converter system |
| CN103401463B (en) * | 2013-07-25 | 2016-01-06 | 天津大学 | The miniature photovoltaic grid-connected inverter that dc-link capacitance reduces and control method |
| JP6153491B2 (en) * | 2014-03-28 | 2017-06-28 | オムロンオートモーティブエレクトロニクス株式会社 | Power supply |
| CN106559006B (en) * | 2015-09-30 | 2019-02-05 | 浙江大学 | Two-way AC-DC converter |
| CN105305796A (en) * | 2015-10-12 | 2016-02-03 | 重庆凯瑞电动汽车系统有限公司 | Frequency converter direct-current busbar overvoltage and under-voltage protection method and system |
| CN106026754B (en) * | 2016-05-24 | 2018-12-11 | 国网福建省电力有限公司 | Multi-purpose bidirectional power power experiment power supply system and its control method |
| CN108011395B (en) * | 2017-12-11 | 2021-04-02 | 江苏辉伦太阳能科技有限公司 | Control method for automatically optimizing charge-discharge loop in hybrid inverter |
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Address after: No. e206-2, R & D building, building e, HUanpu science and Technology Industrial Park, 211 tianguba Road, high tech Zone, Xi'an City, Shaanxi Province, 710048 Patentee after: Xi'an Telai Intelligent Charging Technology Co.,Ltd. Patentee after: Xi'an telingchong New Energy Technology Co.,Ltd. Address before: No. e206-2, R & D building, building e, HUanpu science and Technology Industrial Park, 211 tianguba Road, high tech Zone, Xi'an City, Shaanxi Province, 710048 Patentee before: XI'AN TGOOD INTELLIGENT CHARGING TECHNOLOGY Co.,Ltd. Patentee before: Xi'an teride lingchong New Energy Technology Co.,Ltd. |
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Address after: No. e206-2, R & D building, building e, HUanpu science and Technology Industrial Park, 211 tianguba Road, high tech Zone, Xi'an City, Shaanxi Province, 710048 Patentee after: Xi'an Telai Intelligent Charging Technology Co.,Ltd. Patentee after: Xi'an Lingchong Infinite New Energy Technology Co.,Ltd. Address before: No. e206-2, R & D building, building e, HUanpu science and Technology Industrial Park, 211 tianguba Road, high tech Zone, Xi'an City, Shaanxi Province, 710048 Patentee before: Xi'an Telai Intelligent Charging Technology Co.,Ltd. Patentee before: Xi'an telingchong New Energy Technology Co.,Ltd. |