CN113193759B - High-power four-quadrant converter fault-tolerant control method based on predictive control - Google Patents

High-power four-quadrant converter fault-tolerant control method based on predictive control Download PDF

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CN113193759B
CN113193759B CN202110468014.6A CN202110468014A CN113193759B CN 113193759 B CN113193759 B CN 113193759B CN 202110468014 A CN202110468014 A CN 202110468014A CN 113193759 B CN113193759 B CN 113193759B
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fault
converter
bridge arm
value
cost function
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CN113193759A (en
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张祯滨
张明远
张振坤
李�真
陈昊宇
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SUZHOU RESEARCH INSTITUTE SHANDONG UNIVERSITY
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SUZHOU RESEARCH INSTITUTE SHANDONG UNIVERSITY
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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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
    • 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
    • H02M7/483—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
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/022—Synchronous motors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters

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

Abstract

The invention provides a high-power four-quadrant converter fault-tolerant control method based on predictive control, which comprises the steps of obtaining converter parameter data after a fault bridge arm and a multiplexing bridge arm are connected through a bidirectional thyristor; blocking the switching signals of the fault bridge arm, and recombining the switching state of the converter according to the acquired parameter data; traversing all the states of the combination switches, and predicting the system state quantity at a certain future moment; the weighted sum of the network side cost function and the machine side cost function is the minimum to obtain the optimal combined switch state; controlling the converter according to the optimal combined switch state; the method overcomes the phenomenon of aggravated unbalanced capacitor voltage in the traditional solution, avoids the problems of secondary fault and control precision reduction caused by the phenomenon, fully ensures the continuous operation of the converter system under the fault condition without limiting the degree of freedom of the switching state, and better promotes the reliability and stability of the electric drive system.

Description

High-power four-quadrant converter fault-tolerant control method based on predictive control
Technical Field
The disclosure relates to the technical field of fault-tolerant control of converters, in particular to a high-power four-quadrant converter fault-tolerant control method based on predictive control.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The three-level neutral-point-clamped (3L NPC) back-to-back converter has the advantages of small net-side voltage/current harmonic distortion, low dv/dt value, small net-side filter size and the like, and is widely applied to industrial motor driving systems. However, a converter system in the application occasions of high-performance electric drive and the like works under severe working conditions of high voltage, large current, strong electromagnetic interference, time-varying load, limited heat dissipation and the like for a long time, and often works abnormally or even stops due to faults of a power switching tube caused by semiconductor devices, welding and the like. The abnormal work of the converter system can cause the motor part to be out of control, which not only can cause the reduction of the product quality, but also threatens the running of the linkage equipment and the life safety of operators. The equipment stop is often accompanied with huge economic loss in industry, and the motor is not allowed to stop suddenly in specific application occasions such as electric vehicles and the like. Therefore, the research on the fault-tolerant control strategy of the back-to-back converter has important scientific and engineering significance for the reliable operation of the four-quadrant motor driving system.
The existing fault-tolerant control method mainly comprises the steps of connecting a fault bridge arm of a back-to-back converter with a midpoint of a bus capacitor, rebuilding a converter side model based on two normal bridge arms, adjusting a control algorithm and maintaining continuous operation of the converter under a single-phase fault.
The inventor finds that the traditional fault-tolerant control method can cause the current of a fault bridge arm to flow through the middle point of a bus capacitor, so that the unbalance of the capacitor voltages at the upper side and the lower side is aggravated. On the one hand, the aging speeds of the upper and lower capacitors are inconsistent, the service life of the capacitor with larger pressure bearing capacity is greatly shortened, and the occurrence probability of secondary faults is increased; on the other hand, the predictive control performance of the machine side based on the capacitor voltage is influenced, and the control precision of the motor is reduced. In addition, when a fault bridge arm is connected to the capacitor midpoint, the fault phase voltage is forced to be the lower capacitor voltage, the number of selectable states of the machine side control algorithm is reduced by half, the freedom of selection for predicting and controlling the optimal switch state is severely limited, and the control performance of the motor is greatly reduced.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a high-power four-quadrant converter fault-tolerant control method based on predictive control, which effectively overcomes the phenomenon of intensified unbalanced capacitance and voltage in the traditional solution, avoids the problems of secondary fault and control precision reduction caused by the phenomenon, establishes a novel bridge arm multiplexing fault-tolerant control method under the condition of not limiting the degree of freedom of a switching state, fully ensures the continuous operation of a converter system under the fault condition, better promotes the reliability and stability of an electric drive system, and avoids huge economic loss caused by the fault of the converter in the application occasions of electric vehicles and the like.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
the first aspect of the disclosure provides a bridge arm multiplexing fault-tolerant control circuit.
A bridge arm multiplexing fault-tolerant control circuit is applied to a three-level neutral point clamped back-to-back converter, and a fault bridge arm of the three-level neutral point clamped back-to-back converter is connected with a multiplexing bridge arm through a bidirectional thyristor.
As an optional implementation manner, the multiplexing bridge arm is any one phase bridge arm on the network side, and each phase on the machine side is connected with the multiplexing bridge arm through a respective bidirectional thyristor.
The second aspect of the disclosure provides a high-power four-quadrant converter fault-tolerant control method based on predictive control.
A high-power four-quadrant converter fault-tolerant control method based on predictive control is applied to a three-level midpoint clamping type back-to-back converter and comprises the following processes:
acquiring converter parameter data after a fault bridge arm and a multiplexing bridge arm are connected through a bidirectional thyristor;
blocking the switching signals of the failed bridge arm, and recombining the switching state of the converter according to the acquired parameter data;
traversing all the states of the combination switches, and predicting the system state quantity at a certain future moment;
the weighted sum of the network side cost function and the machine side cost function is the minimum as a target to obtain the optimal combined switch state;
and controlling the converter according to the optimal combined switch state.
As an optional implementation manner, the system state quantity at a future time includes: a power value, a reactive value, a torque value, and a flux linkage value.
As an optional implementation, the network-side cost function is: and the square of the difference value between the active reference value and the active value predicted value is added with the square of the difference value between the reactive reference value and the reactive value predicted value.
As an alternative embodiment, the machine side cost function is: the square of the difference between the flux reference value and the flux linkage predicted value is multiplied by a weight coefficient, and then is summed with the square of the difference between the torque reference value and the torque predicted value.
As an optional implementation manner, based on a model prediction control manner, power prediction and torque control are respectively performed, and then a system state quantity at a certain future time is obtained.
The third aspect of the disclosure provides a fault-tolerant control system of a high-power four-quadrant converter based on predictive control.
A high-power four-quadrant converter fault-tolerant control system based on predictive control is applied to a three-level midpoint clamping type back-to-back converter and comprises the following components:
a data acquisition module configured to: acquiring converter parameter data after a fault bridge arm and a multiplexing bridge arm are connected through a bidirectional thyristor;
a switch state reorganization module configured to: blocking the switching signals of the fault bridge arm, and recombining the switching state of the converter according to the acquired parameter data;
a state quantity prediction module configured to: traversing all the states of the combination switches, and predicting the system state quantity at a certain future moment;
an optimal switch state acquisition module configured to: the weighted sum of the network side cost function and the machine side cost function is the minimum as a target to obtain the optimal combined switch state;
a converter control module configured to: and controlling the converter according to the optimal combined switch state.
A fourth aspect of the present disclosure provides a computer readable storage medium, on which a program is stored, which when executed by a processor, implements the steps in the predictive control-based high-power four-quadrant converter fault-tolerant control method according to the second aspect of the present disclosure.
A fifth aspect of the present disclosure provides an electronic device, which includes a memory, a processor, and a program stored in the memory and executable on the processor, and the processor executes the program to implement the steps in the method for fault-tolerant control of a high-power four-quadrant converter based on predictive control according to the second aspect of the present disclosure.
Compared with the prior art, the beneficial effect of this disclosure is:
according to the method, the system, the computer readable storage medium or the electronic device, the fault bridge arm is connected to the multiplexing bridge arm based on a model prediction control theory, the switching state of the converter is recombined, and under the condition that the selection freedom degree of an original control algorithm is kept, the state change track of the electric drive system in a period of time in the future is predicted by the measured quantity and the calculated state quantity, so that the optimal switching state is selected according to the principle of optimal control effect (namely minimum cost function); the method effectively overcomes the phenomenon of aggravated unbalanced capacitor voltage in the traditional solution, avoids the problems of secondary fault and control precision reduction caused by the aggravated unbalanced capacitor voltage, establishes a novel bridge arm multiplexing fault-tolerant control method under the condition of not limiting the degree of freedom of a switching state, fully ensures the continuous operation of a converter system under the fault condition, better promotes the reliability and stability of an electric drive system, and avoids personal safety accidents and huge economic loss caused by converter faults in application occasions such as electric vehicles and the like.
Advantages of additional aspects of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
Fig. 1 is a topology diagram of a three-level midpoint clamping type back-to-back converter provided in embodiment 1 of the present disclosure.
Fig. 2 is a flow chart of converter control in the prior art provided in embodiment 1 of the present disclosure.
Fig. 3 is a schematic diagram of a hardware configuration of a fault-tolerant control method provided in embodiment 1 of the present disclosure.
Fig. 4 is a control flow chart of the converter under fault-tolerant control provided in embodiment 1 of the present disclosure.
Fig. 5 is a flowchart of a fault-tolerant control procedure provided in embodiment 1 of the present disclosure.
Detailed Description
The present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict.
Example 1:
the embodiment provides a bridge arm multiplexing fault-tolerant control circuit for a three-level neutral point clamped (3L NPC) back-to-back converter system, which is applied to a three-level neutral point clamped back-to-back converter, and a fault bridge arm of the three-level neutral point clamped back-to-back converter is connected with a multiplexing bridge arm through a bidirectional thyristor.
The 3L NPC back-to-back converter model is shown in figure 1 and comprises six-phase bridge arms, a direct current bus and a filter, wherein each phase of bridge arm is composed of four switching tubes and two reverse parallel diodes, three levels can be output by giving different gate signals, and the direct current bus is composed of two capacitors with the same capacitance value. The back-to-back converter can be divided into a power grid side and a motor side on the whole, the power grid side structure is that a direct current bus is connected with a three-phase power supply through an active front-end rectifier, and the motor side structure is that the direct current bus drives a motor through a three-phase inverter.
The model predictive control has the advantage that it can predict the state change of the system at n future moments based on the measured and estimated data in combination with the system model and decide on the best operation at this moment according to the cost function minimization principle. The back-to-back converter normally implements decoupling control on the grid side, and a control block diagram thereof is shown in fig. 2. For the network side, the active reference P is given by the outer ring controlled by the bus voltage and the required working condition respectively*And a reactive reference Q*The controller traverses the 27 independent switch states and predicts the corresponding future active value P[k+1]And a reactive value Q[k+1]Selecting a function which can enable the network side to have the cost:
Jg＝(P*-P[k+1])2+(Q*-Q[k+1])2
the minimum switching state is taken as the switching state at the next moment. For the machine side, the outer ring is controlled by the rotating speed of the motor and the required working condition respectively to give a torque reference
Figure BDA0003044855020000061
With flux linkage reference psi*The controller traverses 27 independent switch states and predicts the corresponding future torque value Te[k+1]With flux linkage value psi[k+1]Selecting an energy machine side cost function:
Figure BDA0003044855020000062
the minimum switching state is the switching state at the next time, where λψThe weighting coefficients are generally set empirically to optimize the effect of the side control.
The fault-tolerant control provided by the embodiment aims at bridge arm faults of a 3L NPC back-to-back converter, and can process fault types including open-circuit faults, short-circuit faults and gating signal intermittent fire faults of a switching device. The short-circuit fault can be converted into an open-circuit fault through the series fuse, the short-time open-circuit fault can be caused by intermittent fire of the gating signals, and the short-circuit fault can also be treated as an open-circuit fault. In order to avoid losing universality, the invention takes open-circuit fault as an example to illustrate the proposed fault-tolerant control method.
The hardware configuration of the fault-tolerant control method provided by the embodiment is shown in fig. 3, the multiplexing bridge arm is a network side a phase, an open-circuit fault occurs at the machine side, and the machine side three phase and the multiplexing bridge arm are connected through a bidirectional thyristor.
Under normal conditions, all three bidirectional thyristors are in an off state; when a fault occurs on the machine side A phase bridge arm, the controller triggers the bidirectional thyristor T after detecting the faultaAnd (4) conducting, connecting the phase A to the multiplexing bridge arm, starting fault-tolerant control, blocking a switching signal of the failed bridge arm, and recombining the switching state of the converter.
The fault-tolerant control process is shown in fig. 4, the switching states of the converter can be divided into three classes according to the switching states of the multiplexing bridge arms, the switching states of the other two phases of the network side and the machine side are recombined under each subclass to obtain a combined switching state of 3 x (3 x 3+3 x 3) ═ 54, the switch state traversal process is shown in fig. 5, and G in the graph is shown in fig. 5shareIn order to multiplex the switching states of the bridge arms,
Figure BDA0003044855020000071
respectively, the switch state vectors applied to the network side and the machine side of the converter; the controller traverses all 54 combined switch states and predicts a corresponding future system state quantity P[k+1]、Q[k+1]、Te[k+1]And psi[k+1]Selecting an enabling weighted cost functionSum (J ═ λ)gJg+λmJm) The minimum switching state is the switching state at the next time, where λg、λmThe network and machine side weight coefficients are used for adjusting the priority of the network and machine side weight coefficients in control, so that a better control effect is achieved.
The types and the number of the controlled variables are different for different predictive control methods; for different applications, the calculation methods of the system state quantities are different, and the requirements can be met by adjusting the cost function; for the back-to-back converter shown in fig. 3, the back-to-back converter can be popularized to a three-phase power electronic topology with any level number, and the multiplexing bridge arm can be any one phase bridge arm on the network side; the motor shown in fig. 3 can be an alternating current motor such as a permanent magnet synchronous motor, an induction motor and the like; for the above-mentioned treatable fault types, the method can also be popularized to any fault type only damaging the bridge arm of the converter.
Example 2:
the embodiment 2 of the present disclosure provides a fault-tolerant control method for a high-power four-quadrant converter based on predictive control, which is applied to a three-level midpoint clamping type back-to-back converter, and includes the following steps:
acquiring converter parameter data after a fault bridge arm and a multiplexing bridge arm are connected through a bidirectional thyristor;
blocking the switching signals of the fault bridge arm, and recombining the switching state of the converter according to the acquired parameter data;
traversing all the states of the combination switches, and predicting the system state quantity at a certain future moment;
the weighted sum of the network side cost function and the machine side cost function is the minimum to obtain the optimal combined switch state;
and controlling the converter according to the optimal combined switch state.
For detailed control process, refer to the control method provided in embodiment 1, and details are not repeated here.
Example 3:
the embodiment 3 of the present disclosure provides a fault-tolerant control system of a high-power four-quadrant converter based on predictive control, which is applied to a three-level midpoint clamping type back-to-back converter, and includes:
a data acquisition module configured to: acquiring converter parameter data after a fault bridge arm and a multiplexing bridge arm are connected through a bidirectional thyristor;
a switch state reorganization module configured to: blocking the switching signals of the fault bridge arm, and recombining the switching state of the converter according to the acquired parameter data;
a state quantity prediction module configured to: traversing all the states of the combination switches, and predicting the system state quantity at a certain future moment;
an optimal switch state acquisition module configured to: the weighted sum of the network side cost function and the machine side cost function is the minimum to obtain the optimal combined switch state;
a converter control module configured to: and controlling the converter according to the optimal combined switch state.
The working method of the system refers to the control method provided in embodiment 1, and details are not repeated here.
Example 4:
the embodiment 4 of the present disclosure provides a computer-readable storage medium, on which a program is stored, and when the program is executed by a processor, the method implements the steps in the fault-tolerant control method for the high-power four-quadrant converter based on the predictive control according to the embodiment 2 of the present disclosure, where the steps are:
acquiring converter parameter data after a fault bridge arm and a multiplexing bridge arm are connected through a bidirectional thyristor;
blocking the switching signals of the fault bridge arm, and recombining the switching state of the converter according to the acquired parameter data;
traversing all the states of the combination switches, and predicting the system state quantity at a certain future moment;
the weighted sum of the network side cost function and the machine side cost function is the minimum to obtain the optimal combined switch state;
and controlling the converter according to the optimal combined switch state.
For detailed control process, reference is made to the control method provided in embodiment 1, and details are not repeated here.
Example 5:
the embodiment 5 of the present disclosure provides an electronic device, which includes a memory, a processor, and a program stored in the memory and capable of running on the processor, where the processor executes the program to implement the steps in the method for fault-tolerant control of a high-power four-quadrant converter based on predictive control according to the embodiment 2 of the present disclosure, where the steps are as follows:
acquiring converter parameter data after a fault bridge arm and a multiplexing bridge arm are connected through a bidirectional thyristor;
blocking the switching signals of the failed bridge arm, and recombining the switching state of the converter according to the acquired parameter data;
traversing all the states of the combination switches, and predicting the system state quantity at a certain future moment;
the weighted sum of the network side cost function and the machine side cost function is the minimum to obtain the optimal combined switch state;
and controlling the converter according to the optimal combined switch state.
For detailed control process, refer to the control method provided in embodiment 1, and details are not repeated here.
As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the disclosure. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.

Claims (7)

1. A high-power four-quadrant converter fault-tolerant control method based on predictive control is based on a bridge arm multiplexing fault-tolerant control circuit and is applied to a three-level neutral point clamped back-to-back converter, and a fault bridge arm of the three-level neutral point clamped back-to-back converter is connected with a multiplexing bridge arm through a bidirectional thyristor; the method is characterized in that: the three-level midpoint clamping type back-to-back converter comprises the following processes:
acquiring converter parameter data after a fault bridge arm and a multiplexing bridge arm are connected through a bidirectional thyristor;
blocking the switching signals of the fault bridge arm, and recombining the switching state of the converter according to the acquired parameter data;
traversing all the states of the combination switches, and predicting the system state quantity at a certain future moment;
the weighted sum of the network side cost function and the machine side cost function is the minimum to obtain the optimal combined switch state; wherein, the network side cost function is: the square of the difference value between the active reference value and the active value predicted value is added with the square of the difference value between the reactive reference value and the reactive value predicted value; the machine side cost function is: the square of the difference between the flux linkage reference value and the flux linkage predicted value is multiplied by a weight coefficient, and then the product is added with the square of the difference between the torque reference value and the torque predicted value;
and controlling the converter according to the optimal combined switch state.
2. The fault-tolerant control method for the high-power four-quadrant converter based on the predictive control as claimed in claim 1, characterized in that:
the multiplexing bridge arm is any one phase bridge arm on the network side, and each phase on the machine side is respectively connected with the multiplexing bridge arm through a respective bidirectional thyristor.
3. The fault-tolerant control method for the high-power four-quadrant converter based on the predictive control as claimed in claim 1, characterized in that:
the system state quantity at a certain future time comprises: a power value, a reactive value, a torque value, and a flux linkage value.
4. The fault-tolerant control method for the high-power four-quadrant converter based on the predictive control as claimed in claim 1, characterized in that:
and respectively carrying out power prediction and torque control based on a model prediction control mode so as to obtain the system state quantity at a certain future moment.
5. A high-power four-quadrant converter fault-tolerant control system based on predictive control is based on a bridge arm multiplexing fault-tolerant control circuit and is applied to a three-level neutral point clamped back-to-back converter, and a fault bridge arm of the three-level neutral point clamped back-to-back converter is connected with a multiplexing bridge arm through a bidirectional thyristor; the method is characterized in that: be applied to three level midpoint clamping type back-to-back converter, include:
a data acquisition module configured to: acquiring converter parameter data after a fault bridge arm and a multiplexing bridge arm are connected through a bidirectional thyristor;
a switch state reorganization module configured to: blocking the switching signals of the fault bridge arm, and recombining the switching state of the converter according to the acquired parameter data;
a state quantity prediction module configured to: traversing all the states of the combination switches, and predicting the system state quantity at a certain future moment;
an optimal switch state acquisition module configured to: the weighted sum of the network side cost function and the machine side cost function is the minimum to obtain the optimal combined switch state; wherein, the network side cost function is: the square of the difference value between the active reference value and the active value predicted value is added with the square of the difference value between the reactive reference value and the reactive value predicted value; the machine side cost function is: the square of the difference between the flux linkage reference value and the flux linkage predicted value is multiplied by a weight coefficient, and then the product is added with the square of the difference between the torque reference value and the torque predicted value;
a converter control module configured to: and controlling the converter according to the optimal combined switch state.
6. A computer readable storage medium, on which a program is stored, wherein the program, when executed by a processor, implements the steps in the predictive control-based high power four quadrant converter fault tolerant control method according to any of claims 1 to 4.
7. An electronic device comprising a memory, a processor and a program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the method for fault-tolerant control of a high-power four-quadrant converter based on predictive control according to any one of claims 1 to 4.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107017816A (en) * 2017-04-25 2017-08-04 南京航空航天大学 Electric automobile driving and charging system and failure reconfiguration method with fault-tolerant ability
CN112104214A (en) * 2020-08-19 2020-12-18 同济大学 Self-adaptive fault-tolerant control method for compound open-circuit fault of three-level inverter switching tube

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2978122A1 (en) * 2014-07-22 2016-01-27 ABB Technology AG Model predictive control of a modular multilevel converter
CN104993710B (en) * 2015-07-13 2017-12-29 华中科技大学 A kind of variable frequency regulating speed control method of the bridge arm power inverter of three-phase five
CN106208649B (en) * 2016-07-26 2018-10-23 上海交通大学 The failure reconfiguration method that parallel connection type current transformer is controlled based on virtual bridge arm
CN107579653A (en) * 2017-09-28 2018-01-12 上海交通大学 A kind of wind electric converter bridge arm is multiplexed reconfigurable control method and system
CN108092303B (en) * 2017-12-05 2019-10-11 东南大学 A kind of fault tolerant control method and system of wind generator system back-to-back converter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107017816A (en) * 2017-04-25 2017-08-04 南京航空航天大学 Electric automobile driving and charging system and failure reconfiguration method with fault-tolerant ability
CN112104214A (en) * 2020-08-19 2020-12-18 同济大学 Self-adaptive fault-tolerant control method for compound open-circuit fault of three-level inverter switching tube

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