Arbitrary voltage generator and control method and control device thereof

Abstract

The present application provides an arbitrary voltage generator and a control method and control device thereof. The arbitrary voltage generator includes: a three-phase multi-winding transformer or N three-phase dual-winding transformers; the primary coil of the three-phase multi-winding transformer is connected to an AC power supply; the primary coil of the three-phase dual-winding transformer is connected to an AC power supply; a multi-level DC voltage unit, the multi-level DC voltage unit including N DC voltage units, each DC voltage unit including three input terminals, each of which is connected one-to-one with the three phases of the secondary coil of the three-phase multi-winding transformer or the three-phase dual-winding transformer; the N DC voltage units are connected in series to form two output terminals; the N DC voltage units output at least two voltage amplitude weights, the DC voltage unit of each voltage amplitude weight outputting a positive polarity level, a zero level, or a negative polarity level, and an arbitrary voltage is output by connecting DC voltage units of different voltage amplitude weights in series.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to an arbitrary voltage generator and a control method and control device thereof. Background Art

[0002] High-voltage power electronic equipment is increasingly being used around the world. To verify the performance of high-voltage equipment, it is often necessary to apply various voltage stresses to the test pieces.

[0003] However, due to the different voltage waveform requirements, in order to provide such test conditions, manufacturers often need to purchase different voltage source equipment and build large laboratories, which are extremely expensive, have a long construction period, and high maintenance costs.

[0004] Therefore, it is necessary to propose an arbitrary voltage generator and a control method and control device thereof to solve the current problem of being unable to accurately output complex changing voltages.

[0005] The above information disclosed in this Background section is only for enhancement of understanding of the background of the application and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Summary of the Invention

[0006] In order to solve the above problems, the present application proposes an arbitrary voltage generator and a control method and a control device thereof.

[0007] According to a first aspect of the present application, an arbitrary voltage generator is provided, comprising:

[0008] A three-phase multi-winding transformer or N three-phase double-winding transformers, where N is an integer greater than or equal to 2;

[0009] The three-phase multi-winding transformer includes a primary coil and N secondary coils, and the primary coil is connected to an AC power source;

[0010] Roll No.: 230001CI

[0011] The three-phase double-winding transformer includes a primary coil and a secondary coil, and the primary coil is connected to an AC power source;

[0012] a multi-level DC voltage unit, the multi-level DC voltage unit comprising N DC voltage units, each DC voltage unit comprising three input terminals, each connected in a one-to-one correspondence to the three phases of the secondary coil of the three-phase multi-winding transformer or the three-phase dual-winding transformer; the N DC voltage units being connected in series to form two output terminals;

[0013] The N DC voltage units output at least two voltage amplitude weights. The DC voltage unit of each voltage amplitude weight outputs a positive polarity level, a zero level or a negative polarity level. By connecting DC voltage units of different voltage amplitude weights in series, any voltage can be output.

[0014] According to some embodiments, the DC voltage unit includes a three-phase bridge controlled rectifier, and the three-phase bridge controlled rectifier is connected to three input terminals of the DC voltage unit;

[0015] The three-phase bridge controlled rectifier includes six switch units, each of which includes at least one stage of power semiconductor devices connected in series or in parallel;

[0016] The power semiconductor device includes at least one of a diode, a thyristor, an IGBT, an IEGT, an IGCT, a GTO, a MOSFET, a BJT, and a GTR.

[0017] According to some embodiments, the DC voltage unit includes a DC capacitor connected in parallel with the three-phase bridge controlled rectifier.

[0018] According to some embodiments, the DC voltage unit includes a voltage selection unit, and the voltage selection unit includes a first switch unit, a second switch unit, a third switch unit, and a fourth switch unit, wherein:

[0019] The first switch unit and the third switch unit are connected in series and then connected in parallel with the DC capacitor, and a midpoint of the series connection of the first switch unit and the third switch unit is connected to an output end of the DC switch unit;

[0020] The second switch unit and the fourth switch unit are connected in series and then connected in parallel with the DC capacitor, and the midpoint of the series connection of the second switch unit and the fourth switch unit is connected to the other output end of the DC switch unit;

[0021] Roll No.: 230001CI

[0022] The first switch unit, the second switch unit, the third switch unit and the fourth switch unit include at least one level of power semiconductor devices connected in series or parallel, and the power semiconductor devices include at least one of a diode, an IGBT, an IEGT, an IGCT, a GTO, a MOSFET, a BJT, and a GTR.

[0023] According to a second aspect of the present application, a control method for any voltage generator as described in any one of the first aspects is provided, wherein each of the N DC voltage units includes a DC capacitor and a voltage selection unit, and the voltage selection unit includes a first switch unit, a second switch unit, a third switch unit, and a fourth switch unit, including:

[0024] Starting and initializing the arbitrary voltage generator;

[0025] Inputting a reference voltage waveform to be simulated into the arbitrary voltage generator and selecting an operating mode;

[0026] calculating trigger pulses of the first switch unit, the second switch unit, the third switch unit, and the fourth switch unit in the voltage selection unit according to the voltage of the DC capacitor and the reference voltage waveform, and unlocking the voltage selection unit;

[0027] An output voltage state of the arbitrary voltage generator is determined.

[0028] According to some embodiments, each of the DC voltage units includes a three-phase bridge controlled rectifier, and starting and initializing the arbitrary voltage generator includes:

[0029] Starting the arbitrary voltage generator;

[0030] Determining whether the state of any voltage generator is normal;

[0031] When the arbitrary voltage generator is in a normal state, setting the level amplitudes of the N DC voltage units in the multi-level DC voltage unit;

[0032] unlocking the N three-phase bridge controlled rectifiers of the N DC voltage units;

[0033] Determining whether the voltages of the N DC capacitors in the multi-level DC voltage unit are normal;

[0034] When the voltage of any one of the N DC capacitors is abnormal, the three-phase bridge controlled rectifier is locked and the arbitrary voltage generator is shut down.

[0035] According to some embodiments, starting and initializing the arbitrary voltage generator further includes: Volume No.: 230001CI

[0036] When any one of the N DC voltage units is in an abnormal state, the arbitrary voltage generator is shut down.

[0037] According to some embodiments, inputting a reference voltage waveform to be simulated into the arbitrary voltage generator and selecting an operating mode includes:

[0038] Select single, multiple or continuous operation mode according to the settings.

[0039] According to some embodiments, calculating trigger pulses of the first switch unit, the second switch unit, the third switch unit, and the fourth switch unit in the voltage selection unit according to the voltage of the DC capacitor and the reference voltage waveform, and unlocking the voltage selection unit, includes:

[0040] Determining whether the reference point voltage of the reference voltage waveform is zero;

[0041] When the reference point voltage is zero, each of the voltage selection units outputs a zero level.

[0042] According to some embodiments, when the reference point voltage is zero, each of the voltage selection units outputs a zero level, including:

[0043] turning on the first switch unit and the second switch unit of the voltage selection unit, and turning off the third switch unit and the fourth switch unit; or

[0044] The third switch unit and the fourth switch unit of the voltage selection unit are turned on, and the first switch unit and the second switch unit are turned off.

[0045] According to some embodiments, further comprising:

[0046] When the reference point voltage is not zero, set the voltage sum U sum =0;

[0047] According to the voltages of the DC capacitors of the N DC voltage units, the voltage sequence U is obtained by sorting them from large to small. j , 1≤j≤N, where the voltage sequence U j is a sequence to be accumulated with the voltage sum;

[0048] In the case that the accumulation termination condition is not met, the voltage sum is accumulated with the voltage of the DC capacitor of the mth DC voltage unit in the order specified by the sequence of accumulation with the voltage sum. sum =U sum +U m , m≥1, obtain the updated voltage sum, wherein the accumulation termination condition includes m greater than N or the updated voltage sum is equal to the reference voltage volume number: 230001CI

[0049] The absolute value of the reference point voltage of the waveform;

[0050] When the updated voltage sum is greater than the absolute value of the reference point voltage of the reference voltage waveform, determining that the voltage selection unit of the m-th DC voltage unit outputs a zero level, and subtracting the voltage value of the m-th DC voltage unit from the updated voltage sum as the updated voltage sum;

[0051] When the updated voltage sum is not greater than the absolute value of the reference point voltage of the reference voltage waveform, recording the mth DC voltage unit;

[0052] When the accumulation termination condition is met, determining whether the reference point voltage is greater than zero:

[0053] When the reference point voltage is greater than zero, determining that the voltage selection unit of the recorded DC voltage unit outputs a positive level;

[0054] In a case where the reference point voltage is less than zero, it is determined that the voltage selection unit of the recorded DC voltage unit outputs a negative level.

[0055] According to some embodiments, when the reference point voltage is greater than zero, determining that the voltage selection unit of the recorded DC voltage unit outputs a positive level includes:

[0056] The first switch unit and the fourth switch unit of the voltage selection unit are turned on, and the second switch unit and the third switch unit are turned off.

[0057] According to some embodiments, when the reference point voltage is less than zero, determining that the voltage selection unit of the recorded DC voltage unit outputs a negative level includes:

[0058] The first switch unit and the fourth switch unit of the voltage selection unit are turned off, and the second switch unit and the third switch unit are turned on.

[0059] According to some embodiments, determining the output voltage state of the arbitrary voltage generator includes:

[0060] Determining whether the output voltage state of the arbitrary voltage generator is normal;

[0061] When the output voltage state of any voltage generator is abnormal, the three-phase bridge controlled rectifier and voltage of the N DC voltage units of the multi-level DC voltage unit are locked.

[0062] A selection unit, wherein the arbitrary voltage generator is shut down;

[0063] When the output voltage of the arbitrary voltage generator is normal, the next reference point voltage of the reference voltage waveform is executed.

[0064] According to a third aspect of the present application, a control device for an arbitrary voltage generator is provided, characterized in that it is used to perform the control method for an arbitrary voltage generator as described in any one of the second aspects, wherein the N DC voltage units each include a three-phase bridge controlled rectifier, and the control device includes:

[0065] a multi-level voltage control and protection unit, configured to perform status monitoring, output voltage control, and fault protection on the three-phase bridge controlled rectifiers of the N DC voltage units;

[0066] A voltage source pulse control unit, configured to generate trigger pulses for the switching units of N three-phase bridge controlled rectifiers according to the control instructions output by the multi-level voltage control protection unit;

[0067] an output control protection unit, configured to monitor the voltages of the DC capacitors in the N DC voltage units, generate control instructions for the voltage selection units in the N DC voltage units based on input reference voltage waveforms, and provide fault protection for the N DC capacitors and the N voltage selection units;

[0068] an output pulse control unit, configured to generate trigger pulses for the N voltage selection units according to a control instruction output by the output control protection unit;

[0069] an input / output unit, configured to exchange data with the multi-level voltage control protection unit, the voltage source pulse control unit, the output control protection unit, and the output pulse control unit, send trigger pulses to the switch units of the N three-phase bridge controlled rectifiers and the N voltage selection units, and receive status information of the switch units of the N three-phase bridge controlled rectifiers and the N voltage selection units;

[0070] A human-machine interface unit, configured to perform signal exchange with the input / output unit and an external PC, receive input instructions from the external PC, receive status information from the input / output unit, and issue control instructions to the input / output unit;

[0071] The power supply unit is the multi-level voltage control protection unit, the voltage source pulse control unit, the output control protection unit, the output pulse control unit, the input / output volume number: 230001CI

[0072] The output unit and the human-machine interface unit provide power.

[0073] The present application proposes an arbitrary voltage generator, which includes multi-level DC voltage units with different weights. The present application also proposes a control method and control device for the arbitrary voltage generator, which uses a level approximation algorithm to solve the problem that existing experimental equipment cannot accurately output complex changing voltages. The topology structure is simple, the control accuracy is high, and it is easy to implement. It can achieve microsecond-level tracking simulation of various rapidly changing complex voltage waveforms.

[0074] It should be understood that the foregoing general description and the following detailed description are merely illustrative and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0075] By describing in detail exemplary embodiments thereof with reference to the accompanying drawings, the above and other objects, features and advantages of the present application will become more apparent. The drawings described below are only some embodiments of the present application, and are not intended to limit the present application.

[0076] Figure 1 A schematic diagram of an arbitrary voltage generator circuit is shown according to an exemplary embodiment;

[0077] Figure 2 Another embodiment of an exemplary arbitrary voltage generator circuit schematic is shown;

[0078] Figure 3 A flow chart illustrating a method for controlling an arbitrary voltage generator according to an exemplary embodiment;

[0079] Figure 4 A flow chart showing a control method of an arbitrary voltage generator step S1 according to an exemplary embodiment;

[0080] Figure 5 A flow chart showing a control method of the arbitrary voltage generator step S2 according to an exemplary embodiment;

[0081] Figure 6 A flow chart showing a control method of the arbitrary voltage generator step S3 according to an exemplary embodiment;

[0082] Figure 7 A flow chart showing a control method of the arbitrary voltage generator step S4 according to an exemplary embodiment;

[0083] Figure 8 Another embodiment of a flowchart showing an exemplary arbitrary voltage generator step S3 control method;

[0084] Figure 9 Schematic diagram of a control device for an arbitrary voltage generator showing an exemplary embodiment; Volume No.: 230001CI

[0085] Figure 10A waveform diagram showing a simulated sine wave of an arbitrary voltage generator according to an exemplary embodiment;

[0086] Figure 11 A waveform diagram showing an exemplary embodiment of an arbitrary voltage generator simulating non-standard complex changes. DETAILED DESCRIPTION

[0087] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Like reference numerals in the drawings represent like or similar parts, and thus repetitive description thereof will be omitted.

[0088] The described features, structures or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of these specific details, or other methods, components, materials, devices, etc. may be employed. In these cases, well-known structures, methods, devices, implementations, materials or operations will not be shown or described in detail.

[0089] The flowcharts shown in the accompanying drawings are for illustrative purposes only and do not necessarily include all contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may be decomposed, while others may be combined or partially combined. Therefore, the actual execution order may vary depending on the actual situation.

[0090] The terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish between different objects, not to describe a particular order. Furthermore, the terms "including," "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0091] Those skilled in the art will understand that the drawings are merely schematic diagrams of example embodiments, and the modules or processes in the drawings are not necessarily necessary for implementing the present application, and therefore cannot be used to limit the scope of protection of the present application.

[0092] Roll No.: 230001CI

[0093] Figure 1A schematic diagram of an arbitrary voltage generator circuit is shown according to an exemplary embodiment.

[0094] See also Figure 1 The arbitrary voltage generator includes: a three-phase multi-winding transformer 2 and a multi-level DC voltage unit 3. The multi-level DC voltage unit 3 includes N DC voltage units 3N, where N is an integer greater than or equal to 2.

[0095] According to the exemplary embodiment, a three-phase multi-winding transformer 2 includes a primary coil and N secondary coils, wherein the primary coil is connected to an AC power source 1; each DC voltage unit 3N includes three input terminals, which are connected one-to-one to the three phases of the secondary coil of the three-phase multi-winding transformer 2; the N DC voltage units 3N are connected in series to form two output terminals, which are connected to a test object 4.

[0096] According to some embodiments, the arbitrary voltage generator applies an arbitrary voltage to the test object 4, which includes a combination of capacitance, resistance, and / or inductance.

[0097] According to some embodiments, the DC voltage units 31 to 3N output at least two voltage amplitude weights, and the DC voltage units of each voltage amplitude weight output a positive polarity level, a zero level, or a negative polarity level. By connecting DC voltage units of different voltage amplitude weights in series, any voltage can be output.

[0098] According to an exemplary embodiment, taking the DC voltage unit 31 as an example, the DC voltage unit 31 includes a three-phase bridge-controlled rectifier 311, which is connected to the three input terminals of the DC voltage unit 3N; the three-phase bridge-controlled rectifier 311 includes six switch units 3111 to 3116, and the switch units 3111 to 3116 include at least one stage of power semiconductor devices connected in series or in parallel.

[0099] According to some embodiments, the power semiconductor device includes at least one of a diode, a thyristor, an IGBT, an IEGT, an IGCT, a GTO, a MOSFET, a BJT, and a GTR.

[0100] According to an example embodiment, the DC voltage unit 31 further includes a DC capacitor 312 connected in parallel with the three-phase bridge controlled rectifier 311 .

[0101] According to an example embodiment, the DC voltage unit 31 further includes a voltage selection unit 313, which includes a first switch unit 3131, a second switch unit 3132, a third switch unit 3133, and a fourth switch unit 3134, wherein:

[0102] The first switch unit 3131 and the third switch unit 3133 are connected in series and then connected in parallel with the DC capacitor 312. The midpoint of the series connection between the first switch unit 3131 and the third switch unit 3133 is connected to one output terminal of the DC switch unit 31. The second switch unit 3132 and the fourth switch unit 3134 are connected in series and then connected in parallel with the DC capacitor 312. The midpoint of the series connection between the second switch unit 3132 and the fourth switch unit 3134 is connected to the other output terminal of the DC switch unit.

[0103] Roll No.: 230001CI

[0104] According to some embodiments, the first switch unit 3131, the second switch unit 3132, the third switch unit 3133 and the fourth switch unit 3134 include at least one level of power semiconductor devices connected in series or in parallel, and the power semiconductor devices include at least one of a diode, an IGBT, an IEGT, an IGCT, a GTO, a MOSFET, a BJT, and a GTR.

[0105] This application proposes an arbitrary voltage generator, which includes multi-level DC voltage units with different weights. It solves the problem that existing experimental equipment cannot accurately output complex changing voltages. It has a simple topology, high control accuracy, and is easy to implement. It can achieve microsecond-level tracking simulation of various rapidly changing complex voltage waveforms.

[0106] Figure 2 Yet another embodiment of an exemplary arbitrary voltage generator circuit schematic is shown.

[0107] like Figure 2 As shown, Figure 2 The circuit shown is Figure 1 The circuits shown are basically the same, with the only difference being that the arbitrary voltage generator includes N three-phase dual-winding transformers and a multi-level DC voltage unit 3 , and the multi-level DC voltage unit 3 includes N DC voltage units 3N, where N is an integer greater than or equal to 2.

[0108] According to the exemplary embodiment, the three-phase dual-winding transformers 21-2N respectively include a primary coil and a secondary coil, the primary coil is connected to the AC power supply 3, and each DC voltage unit 31-3N includes three input terminals, which are respectively connected to the three phases of the secondary coil of the three-phase dual-winding transformer 21-2N in a one-to-one correspondence.

[0109] Figure 3 A flow chart illustrating a method for controlling an arbitrary voltage generator according to an exemplary embodiment.

[0110] S1, start and initialize the arbitrary voltage generator.

[0111] like Figure 4As shown, the process of starting and initializing the control method of any voltage generator includes:

[0112] S101, starting an arbitrary voltage generator;

[0113] S102, determining whether the state of any voltage generator is normal;

[0114] According to an exemplary embodiment, the arbitrary voltage generator further includes a controller that checks whether the status of the three-phase multi-winding transformer or N three-phase two-winding transformers, the multi-level DC voltage unit and the controller are normal; if normal, proceed to S103; if abnormal, the arbitrary voltage generator is shut down.

[0115] S103, when the multi-level DC voltage unit is in a normal state, setting level amplitudes of N DC voltage units in the multi-level DC voltage unit;

[0116] Roll No.: 230001CI

[0117] S104, unlocking N three-phase bridge controlled rectifiers of N DC voltage units;

[0118] S105, determining the number of N DC capacitors Uc in the multi-level DC voltage unit i Is the voltage normal?

[0119] According to an exemplary embodiment, it is determined that the number of N DC capacitors Uc in the multi-level DC voltage unit i Is the voltage of (i=1,2…N) normal?

[0120] When the voltages of the N DC capacitors are normal, the arbitrary voltage generator is initialized successfully and step S2 is executed; when the voltage of any one of the N DC capacitors is abnormal, the three-phase bridge controlled rectifier is locked and the arbitrary voltage generator is shut down.

[0121] S2: Input the reference voltage waveform to be simulated into the arbitrary voltage generator and select the operation mode.

[0122] like Figure 5 As shown, the reference voltage waveform to be simulated is input to the arbitrary voltage generator, and the control method process of selecting the operating mode includes:

[0123] S201, inputting a reference voltage waveform to be simulated into an arbitrary voltage generator;

[0124] S202, selecting single, multiple or continuous operation mode according to the setting.

[0125] According to some embodiments, the single mode means that the defined segment of the input reference voltage waveform is output only once, the multiple mode means that the defined segment of the input reference voltage waveform is output a set number of times, and the continuous operation mode means that the defined segment of the input reference voltage waveform is output continuously.

[0126] S3 , calculating trigger pulses of the first switch unit, the second switch unit, the third switch unit, and the fourth switch unit in the voltage selection unit according to the voltage of the DC capacitor and the reference voltage waveform, and unlocking the voltage selection unit.

[0127] like Figure 6 As shown, the control method process of step S3 includes:

[0128] S301, determining the reference point voltage U of the reference voltage waveform ref1 Is it zero?

[0129] According to an exemplary embodiment, if the voltage U ref1 If the reference point voltage U is zero, go to S303; ref1 If it is not zero, go to S302.

[0130] S302: When the reference point voltage is not zero, set the voltage sum U sum =0.

[0131] According to an example embodiment, and go to S3041.

[0132] S303, each voltage selection unit outputs a zero level.

[0133] According to an example embodiment, each voltage selection unit outputting a zero level includes: turning on the first switch unit and the second switch unit of the voltage selection unit, and turning off the third switch unit and the fourth switch unit; or turning on the third switch unit and the fourth switch unit of the voltage selection unit, and turning off the third switch unit and the fourth switch unit.

[0134] The first switch unit and the second switch unit are turned off; and S3 ends.

[0135] S3041, sort the voltages of the DC capacitors of the N DC voltage units from large to small to obtain a voltage sequence U j .

[0136] According to an exemplary embodiment, the N DC capacitors Uc in the multi-level DC voltage unit i The voltages of (i=1,2…N) are sorted from large to small, and the voltage sequence is U j , 1≤j≤N.

[0137] S3042, summing the voltage sum and the voltage of the DC capacitor of the mth DC voltage unit to obtain U sum =U sum +U m , and obtain the updated voltage sum.

[0138] According to an exemplary embodiment, if the accumulation termination condition is not satisfied, the voltage sum is accumulated with the voltage of the DC capacitor of the mth DC voltage unit in the order specified by the sequence of accumulation with the voltage sum. sum =U sum +U m , m≥1, and obtain the updated voltage sum.

[0139] According to some embodiments, the accumulation termination condition includes that m is greater than N or the updated voltage sum is equal to the absolute value of the reference point voltage of the reference voltage waveform.

[0140] S3043: Determine whether the updated voltage sum is greater than the absolute value of the reference point voltage of the reference voltage waveform.

[0141] According to an example embodiment, when the sum of the voltages after the mth cumulative update is greater than the absolute value of the reference point voltage of the reference voltage waveform, 1≤m≤N, go to S3044; when the sum of the voltages after the update is not greater than the absolute value of the reference point voltage of the reference voltage waveform, record the mth DC voltage unit and go to S3046.

[0142] S3044, the voltage selection unit of the mth DC voltage unit outputs a zero level.

[0143] According to an example embodiment, in a case where the voltage sum after the m-th cumulative update is greater than the absolute value of the reference point voltage of the reference voltage waveform, the voltage selection unit of the m-th DC voltage unit outputs a zero level.

[0144] S3045 : Subtract the voltage value of the mth DC voltage unit from the updated voltage sum.

[0145] According to an exemplary embodiment, the updated voltage sum is subtracted from the voltage value of the mth DC voltage unit to obtain the updated voltage sum U sum =U sum -U m .

[0146] S3046, m=m+1.

[0147] S3047, determine whether to terminate accumulation.

[0148] According to some embodiments, the accumulation termination condition includes m being greater than N or the updated electronic volume number: 230001CI

[0149] The sum of the voltages is equal to the absolute value of the reference point voltage of the reference voltage waveform.

[0150] According to an example embodiment, it is determined whether m is greater than N: if m is greater than N, proceed to S305 ; if m is less than or equal to N, proceed to S3042 .

[0151] S305: Determine whether the reference point voltage is greater than zero.

[0152] According to an exemplary embodiment, the reference point voltage U is determined ref1 Is it greater than zero, at the reference point voltage U ref1 If it is greater than zero, go to S3061; when the reference point voltage U ref1 If it is less than zero, go to S3062.

[0153] S3061, determining that the voltage selection unit of the recorded DC voltage unit outputs a positive level.

[0154] According to an exemplary embodiment, at the reference point voltage U ref1 When the value is greater than zero, it is determined that the voltage selection unit of the recorded DC voltage unit outputs a positive level, and the voltage selection unit outputs a positive level including: the first switch unit and the fourth switch unit are turned on, and the second switch unit and the third switch unit are turned off.

[0155] S3062: Determine whether the voltage selection unit of the recorded DC voltage unit outputs a negative level.

[0156] According to an exemplary embodiment, at the reference point voltage U ref1 When the voltage is less than zero, it is determined that the voltage selection unit of the recorded DC voltage unit outputs a negative level, and the voltage selection unit outputs a negative level including: the first switch unit and the fourth switch unit are turned off, and the second switch unit and the third switch unit are turned on.

[0157] S4, judging the output voltage state of the arbitrary voltage generator.

[0158] like Figure 7 As shown, the control method process of step S4 includes:

[0159] S401, determining whether the output voltage state of any voltage generator is normal.

[0160] According to an example embodiment, when the output voltage state of any voltage generator is abnormal, the process proceeds to S402 ; when the output voltage state of any voltage generator is normal, the process proceeds to S403 .

[0161] S402 , locking the three-phase bridge controlled rectifiers and the voltage selection unit of the N DC voltage units of the multi-level DC voltage unit, and shutting down any voltage generator.

[0162] According to an example embodiment, when the output voltage state of any voltage generator is abnormal, the three-phase bridge controlled rectifiers and the voltage selection unit of N DC voltage units of the multi-level DC voltage unit are locked, and the arbitrary voltage generator is shut down.

[0163] S403, executing the next reference point voltage of the reference voltage waveform.

[0164] According to an exemplary embodiment, when the output voltage of any voltage generator is normal, the filing number: 230001CI

[0165] The next reference point voltage of the horizontal reference voltage waveform.

[0166] This application proposes a control method and control device for an arbitrary voltage generator, which uses a level approximation algorithm to solve the problem that existing experimental equipment cannot accurately output complex changing voltages. The topology is simple, the control accuracy is high, and it is easy to implement. It can achieve microsecond-level tracking simulation of various rapidly changing complex voltage waveforms.

[0167] Figure 8 Another embodiment of a flowchart showing an exemplary arbitrary voltage generator step S3 control method.

[0168] like Figure 8 As shown, the control method process of step S3 includes:

[0169] S301, determining the reference point voltage U of the reference voltage waveform ref1 Is it zero?

[0170] According to an exemplary embodiment, if the voltage U ref1 If the reference point voltage U is zero, go to S303; ref1 If it is not zero, go to S302.

[0171] S302: When the reference point voltage is not zero, set the voltage sum U sum =0.

[0172] According to an example embodiment, and go to S3041.

[0173] S303, each voltage selection unit outputs a zero level.

[0174] According to an example embodiment, each voltage selection unit outputting a zero level includes: turning on the first switch unit and the second switch unit of the voltage selection unit, and turning off the third switch unit and the fourth switch unit; or turning on the third switch unit and the fourth switch unit of the voltage selection unit, and turning off the first switch unit and the second switch unit; and ending S3.

[0175] S3041, sort the voltages of the DC capacitors of the N DC voltage units from large to small to obtain a voltage sequence U j .

[0176] According to an exemplary embodiment, the N DC capacitors Uc in the multi-level DC voltage unit i The voltages of (i=1,2…N) are sorted from large to small, and the voltage sequence is U j , 1≤j≤N.

[0177] S3042, sum the voltage sum and the voltage of the DC capacitor of the mth DC voltage unit to obtain U sum =U sum +U m , and obtain the updated voltage sum.

[0178] According to an exemplary embodiment, j rounds of cycles are performed, and according to the new voltage sequence U j , add the voltage sum and the voltage of the DC capacitor of the mth DC voltage unit to obtain the updated voltage sum U sum =U sum +U m .

[0179] S3043: Determine whether the updated voltage sum is greater than the absolute value of the reference point voltage of the reference voltage waveform.

[0180] Roll No.: 230001CI

[0181] According to an example embodiment, when the voltage sum after the mth cumulative update is greater than the absolute value of the reference point voltage of the reference voltage waveform, m≥1, go to S3044; when the voltage sum after the update is not greater than the absolute value of the reference point voltage of the reference voltage waveform, go to S305.

[0182] S3044, the voltage selection unit of the mth DC voltage unit outputs a zero level.

[0183] According to an example embodiment, in a case where the voltage sum after the m-th cumulative update is greater than the absolute value of the reference point voltage of the reference voltage waveform, the voltage selection unit of the m-th DC voltage unit outputs a zero level.

[0184] S3045 : Subtract the voltage value of the mth DC voltage unit from the updated voltage sum.

[0185] According to an exemplary embodiment, the updated voltage sum is subtracted from the voltage value of the mth DC voltage unit to obtain the updated voltage sum U. sum =U sum -U m .

[0186] S3046, m=m+1.

[0187] S3047, determine whether to terminate accumulation.

[0188] According to the exemplary embodiment, it is determined whether m is greater than N: if m is greater than N, the accumulation is terminated and S3 ends; if m is less than or equal to N, the process goes to S3042.

[0189] S305: Determine whether the reference point voltage is greater than zero.

[0190] According to an exemplary embodiment, the reference point voltage U is determined ref1 Is it greater than zero, at the reference point voltage U ref1 If it is greater than zero, go to S3061; when the reference point voltage U ref1 If it is less than zero, go to S3062.

[0191] S3061: The voltage selection unit of the DC voltage unit outputs a positive level.

[0192] According to an exemplary embodiment, at the reference point voltage U ref1 When the voltage is greater than zero, the voltage selection unit of the DC voltage unit outputs a positive level, and the voltage selection unit outputs a positive level including: the first switch unit and the fourth switch unit are turned on, and the second switch unit and the third switch unit are turned off.

[0193] S3062: The voltage selection unit of the DC voltage unit outputs a negative level.

[0194] According to an exemplary embodiment, at the reference point voltage U ref1 When the voltage is less than zero, the voltage selection unit of the DC voltage unit outputs a negative level, and the voltage selection unit outputs a negative level including: the first switch unit and the fourth switch unit are turned off, and the second switch unit and the third switch unit are turned on.

[0195] Figure 9 A schematic diagram showing the principle of an arbitrary voltage generator control device according to an exemplary embodiment is shown.

[0196] like Figure 9 As shown, the principle of the arbitrary voltage generator control device can execute arbitrary voltage generation. Volume No.: 230001CI

[0197] A control method for an arbitrary voltage generator, wherein the control device comprises:

[0198] A multi-level voltage control and protection unit 1 is used to perform status monitoring, output voltage control and fault protection on the three-phase bridge controlled rectifiers of the N DC voltage units;

[0199] A voltage source pulse control unit 2 is configured to generate trigger pulses for the switching units of N three-phase bridge controlled rectifiers according to the control instructions output by the multi-level voltage control protection unit;

[0200] Output control protection unit 3, used to monitor the voltage of the DC capacitors in the N DC voltage units, generate control instructions for the voltage selection units in the N DC voltage units based on the input reference voltage waveform, and provide fault protection for the N DC capacitors and N voltage selection units;

[0201] An output pulse control unit 4, configured to generate trigger pulses for N voltage selection units according to a control instruction output by the output control protection unit;

[0202] Input / output unit 5, used to exchange data with the multi-level voltage control protection unit, the voltage source pulse control unit, the output control protection unit, and the output pulse control unit, send trigger pulses to the switch units of the N three-phase bridge controlled rectifiers and the N voltage selection units, and receive status information of the switch units of the N three-phase bridge controlled rectifiers and the N voltage selection units;

[0203] Human-machine interface unit 6, used to exchange signals with the input / output unit and the external PC, receive input instructions from the external PC, receive status information from the input / output unit, and issue control instructions to the input / output unit;

[0204] The power supply unit 7 provides power to the multi-level voltage control protection unit, the voltage source pulse control unit, the output control protection unit, the output pulse control unit, the input / output unit and the human-machine interface unit.

[0205] Figure 10 A waveform diagram showing a simulated sine wave generated by an arbitrary voltage generator according to an exemplary embodiment.

[0206] like Figure 10 As shown, this embodiment uses 6 voltage sources, namely 20kV voltage source, 10kV voltage source, 4kV voltage source, 2kV voltage source, 2kV voltage source, and 1kV voltage source, to simulate the high-voltage sine wave, and the output voltage is basically consistent with the reference voltage.

[0207] Figure 11 A waveform diagram showing an exemplary embodiment of an arbitrary voltage generator simulating non-standard complex changes.

[0208] like Figure 11 As shown, this embodiment uses a 20kV voltage source, a 10kV voltage source, a 4kV voltage source, and a 230001CI voltage source.

[0209] A total of 6 voltage sources, including 1kV voltage source, 2kV voltage source, 2kV voltage source, and 1kV voltage source, are used to simulate the complex changing operating voltage of the converter valve, and the output voltage is basically consistent with the reference voltage.

[0210] If a finer output voltage is required, consider adding 0.4kV, 0.2kV, 0.2kV and 0.1kV voltage sources.

[0211] It should be clearly understood that this application describes how to form and use specific examples, but this application is not limited to any details of these examples. On the contrary, based on the teaching of the content disclosed in this application, these principles can be applied to many other embodiments.

[0212] Furthermore, it should be noted that the aforementioned figures are merely illustrative of the processes included in the methods according to exemplary embodiments of the present application and are not intended to be limiting. It is readily understood that the processes illustrated in the aforementioned figures do not indicate or limit the temporal order of these processes. Furthermore, it is readily understood that these processes may be executed synchronously or asynchronously, for example, in multiple modules.

[0213] While the exemplary embodiments of the present application have been specifically illustrated and described above, it should be understood that the present application is not limited to the detailed structures, configurations, or implementations described herein; rather, the present application is intended to encompass various modifications and equivalent configurations within the spirit and scope of the appended claims.

Claims

1. A control method for an arbitrary voltage generator, characterized in that: The arbitrary voltage generator includes a multi-level DC voltage unit, the multi-level DC voltage unit includes N DC voltage units, N is an integer greater than or equal to 2, each of the N DC voltage units includes a DC capacitor and a voltage selection unit, the voltage selection unit includes a first switch unit, a second switch unit, a third switch unit, and a fourth switch unit, including: Starting and initializing the arbitrary voltage generator; Inputting a reference voltage waveform to be simulated into the arbitrary voltage generator and selecting an operating mode; Calculating trigger pulses of the first switch unit, the second switch unit, the third switch unit, and the fourth switch unit in the voltage selection unit according to the voltage of the DC capacitor and the reference voltage waveform, and unlocking the voltage selection unit, including: Determining whether the reference point voltage of the reference voltage waveform is zero; When the reference point voltage is zero, each of the voltage selection units outputs a zero level; When the reference point voltage is not zero, set the voltage sum U sum =0; According to the voltages of the DC capacitors of the N DC voltage units, the voltage sequence U is obtained by sorting them from large to small. j , 1≤j≤N, where the voltage sequence U j is a sequence to be accumulated with the voltage sum; In the case that the accumulation termination condition is not met, the voltage sum is accumulated with the voltage of the DC capacitor of the mth DC voltage unit in the order specified by the sequence of accumulation with the voltage sum. sum =U sum +U m , m≥1, obtaining an updated voltage sum, wherein the accumulation termination condition includes m being greater than N or the updated voltage sum being equal to the absolute value of the reference point voltage of the reference voltage waveform; When the updated voltage sum is greater than the absolute value of the reference point voltage of the reference voltage waveform, determining that the voltage selection unit of the m-th DC voltage unit outputs a zero level, and subtracting the voltage value of the m-th DC voltage unit from the updated voltage sum as the updated voltage sum; When the updated voltage sum is not greater than the absolute value of the reference point voltage of the reference voltage waveform, recording the mth DC voltage unit; When the accumulation termination condition is met, determining whether the reference point voltage is greater than zero: When the reference point voltage is greater than zero, determining that the voltage selection unit of the recorded DC voltage unit outputs a positive level; When the reference point voltage is less than zero, determining that the voltage selection unit of the recorded DC voltage unit outputs a negative level; An output voltage state of the arbitrary voltage generator is determined.

2. The control method according to claim 1, wherein: Each of the DC voltage units includes a three-phase bridge controlled rectifier, and starting and initializing the arbitrary voltage generator includes: Starting the arbitrary voltage generator; Determining whether the state of any voltage generator is normal; When the state of any voltage generator is normal, setting the level amplitudes of the N DC voltage units in the multi-level DC voltage unit; unlocking the N three-phase bridge controlled rectifiers of the N DC voltage units; Determining whether the voltages of the N DC capacitors in the multi-level DC voltage unit are normal; When the voltage of any one of the N DC capacitors is abnormal, the three-phase bridge controlled rectifier is locked and the arbitrary voltage generator is shut down.

3. The control method according to claim 2, wherein: The starting and initializing of the arbitrary voltage generator further includes: When any one of the N DC voltage units is in an abnormal state, the arbitrary voltage generator is shut down.

4. The control method according to claim 1, wherein: The step of inputting a reference voltage waveform to be simulated into the arbitrary voltage generator and selecting an operating mode includes: Select single, multiple or continuous operation mode according to the settings.

5. The control method according to claim 1, wherein: When the voltage at the reference point is zero, each of the voltage selection units outputs a zero level, comprising: turning on the first switch unit and the second switch unit of the voltage selection unit, and turning off the third switch unit and the fourth switch unit; or The third switch unit and the fourth switch unit of the voltage selection unit are turned on, and the first switch unit and the second switch unit are turned off.

6. The control method according to claim 1, wherein: The step of determining that the voltage selection unit of the recorded DC voltage unit outputs a positive level when the reference point voltage is greater than zero includes: The first switch unit and the fourth switch unit of the voltage selection unit are turned on, and the second switch unit and the third switch unit are turned off.

7. The control method according to claim 1, wherein: The step of determining that the voltage selection unit of the recorded DC voltage unit outputs a negative level when the reference point voltage is less than zero includes: The first switch unit and the fourth switch unit of the voltage selection unit are turned off, and the second switch unit and the third switch unit are turned on.

8. The control method according to claim 1, wherein: The determining the output voltage state of the arbitrary voltage generator includes: Determining whether the output voltage state of the arbitrary voltage generator is normal; When the output voltage state of the arbitrary voltage generator is abnormal, the three-phase bridge controlled rectifier and the voltage selection unit of the N DC voltage units of the multi-level DC voltage unit are locked, and the arbitrary voltage generator is shut down; When the output voltage of the arbitrary voltage generator is normal, the next reference point voltage of the reference voltage waveform is executed.

9. A control device for an arbitrary voltage generator, characterized in that: For executing the control method according to any one of claims 1 to 8, the N DC voltage units each include a three-phase bridge controlled rectifier, and the control device includes: a multi-level voltage control and protection unit, configured to perform status monitoring, output voltage control, and fault protection on the three-phase bridge controlled rectifiers of the N DC voltage units; A voltage source pulse control unit, configured to generate trigger pulses for the switching units of N three-phase bridge controlled rectifiers according to the control instructions output by the multi-level voltage control protection unit; an output control protection unit, configured to monitor the voltages of the DC capacitors in the N DC voltage units, generate control instructions for the voltage selection units in the N DC voltage units based on input reference voltage waveforms, and provide fault protection for the N DC capacitors and the N voltage selection units; an output pulse control unit, configured to generate trigger pulses for the N voltage selection units according to a control instruction output by the output control protection unit; an input / output unit, configured to exchange data with the multi-level voltage control protection unit, the voltage source pulse control unit, the output control protection unit, and the output pulse control unit, send trigger pulses to the switch units of the N three-phase bridge controlled rectifiers and the N voltage selection units, and receive status information of the switch units of the N three-phase bridge controlled rectifiers and the N voltage selection units; A human-machine interface unit, configured to perform signal exchange with the input / output unit and an external PC, receive input instructions from the external PC, receive status information from the input / output unit, and issue control instructions to the input / output unit; A power supply unit provides power to the multi-level voltage control protection unit, the voltage source pulse control unit, the output control protection unit, the output pulse control unit, the input / output unit, and the human-machine interface unit.

10. An arbitrary voltage generator, characterized in that: For executing the control method according to any one of claims 1 to 8, the arbitrary voltage generator comprises: A three-phase multi-winding transformer or N three-phase double-winding transformers, where N is an integer greater than or equal to 2; The three-phase multi-winding transformer includes a primary coil and N secondary coils, and the primary coil is connected to an AC power source; The three-phase double-winding transformer includes a primary coil and a secondary coil, and the primary coil is connected to an AC power source; a multi-level DC voltage unit, the multi-level DC voltage unit comprising N DC voltage units, each DC voltage unit comprising three input terminals, each connected in a one-to-one correspondence to the three phases of the secondary coil of the three-phase multi-winding transformer or the three-phase dual-winding transformer; the N DC voltage units being connected in series to form two output terminals; The N DC voltage units output at least two voltage amplitude weights. The DC voltage unit of each voltage amplitude weight outputs a positive polarity level, a zero level or a negative polarity level. By connecting DC voltage units of different voltage amplitude weights in series, any voltage can be output.

11. The arbitrary voltage generator according to claim 10, characterized in that The DC voltage unit includes a three-phase bridge controlled rectifier, and the three-phase bridge controlled rectifier is connected to three input terminals of the DC voltage unit; The three-phase bridge controlled rectifier includes six switch units, each of which includes at least one stage of power semiconductor devices connected in series or in parallel; The power semiconductor device includes at least one of a diode, a thyristor, an IGBT, an IEGT, an IGCT, a GTO, a MOSFET, a BJT, and a GTR.

12. The arbitrary voltage generator according to claim 11, wherein: The DC voltage unit includes a DC capacitor, which is connected in parallel with the three-phase bridge controlled rectifier.

13. The arbitrary voltage generator according to claim 12, characterized in that The DC voltage unit includes a voltage selection unit, and the voltage selection unit includes a first switch unit, a second switch unit, a third switch unit, and a fourth switch unit, wherein: The first switch unit and the third switch unit are connected in series and then connected in parallel with the DC capacitor, and a midpoint of the series connection of the first switch unit and the third switch unit is connected to an output end of the DC voltage unit; The second switch unit and the fourth switch unit are connected in series and then connected in parallel with the DC capacitor, and a midpoint of the series connection of the second switch unit and the fourth switch unit is connected to the other output end of the DC voltage unit; The first switch unit, the second switch unit, the third switch unit and the fourth switch unit include at least one level of power semiconductor devices connected in series or parallel, and the power semiconductor devices include at least one of a diode, an IGBT, an IEGT, an IGCT, a GTO, a MOSFET, a BJT, and a GTR.

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