Carrier reconstruction modulation method, device, electronic device and storage medium

Abstract

The present application provides a carrier reconstruction modulation method, device, electronic device and storage medium, the method comprising: obtaining a symmetrical triangular carrier and a modulation wave of a flying capacitor type multi-level rectifier; constructing a multi-segment sawtooth carrier according to the symmetrical triangular carrier; determining the carrier corresponding to each pair of power tubes according to the multi-segment sawtooth carrier; decomposing the modulation wave to obtain a decomposed modulation wave corresponding to each carrier; determining the switch signal of each pair of power tubes according to the carrier corresponding to each pair of power tubes and the decomposed modulation wave corresponding to each pair of power tubes to control the operation of the flying capacitor type multi-level rectifier. This scheme can take into account both the self-balancing of the flying capacitor voltage and the optimal line voltage harmonic characteristics.

Description

Technical Field

[0001] The present invention belongs to the technical field of power electronics, and in particular relates to a carrier reconstruction modulation method, device, electronic equipment and storage medium. Background Art

[0002] The flying capacitor type multi-level rectifier has many redundant switches and a high degree of freedom in selection. In steady state, it is necessary to ensure the voltage balance of the flying capacitor, which is directly related to the modulation strategy. At present, the modulation strategies for multi-level converters are mainly divided into space vector modulation strategy and sinusoidal pulse width modulation strategy. The space vector modulation strategy uses the basic voltage vector to synthesize the reference voltage vector, with high DC voltage utilization and large degree of freedom. However, as the number of levels increases, the number of basic voltages and the number of phase voltage combinations will increase in square and cube multiples, and the complexity will increase greatly. For converters with more than 5 levels, the space vector modulation strategy is difficult to implement. Compared with the space vector modulation strategy, the sinusoidal pulse width modulation strategy directly compares the sinusoidal signal with the triangular carrier to obtain a level pulse, which is simple to operate and easy to implement.

[0003] There are many modulation modes for sinusoidal pulse width modulation strategies according to different carrier forms, among which phased disposition PWM (PDPWM) and phase shift PWM (PSPWM) are the most widely used. PDPWM makes the harmonic energy of the three-phase voltage mainly concentrated at the primary carrier frequency, and cancels each other in the line voltage, so it has the best line voltage harmonic performance, but it does not fully utilize the influence of redundant switch states and cannot achieve self-balancing of flying capacitor voltage. For flying capacitor rectifiers, the flying capacitor balance needs to be ensured during steady-state operation. Therefore, the level state can only be obtained through PDPWM first, and then the appropriate redundant switch state is selected in conjunction with control algorithms such as logical expressions and cost function calculations to achieve flying capacitor voltage balance. However, the switching back and forth between redundant switch states causes multiple pairs of power tubes to switch at the same time, increasing switching losses, and easily generating parasitic voltage modes during the switching process, affecting the waveform quality. Different from PDPWM, PSPWM directly generates a switching signal after comparing the sinusoidal signal with the triangular carrier. Since redundant switch states with opposite effects on the flying capacitor voltage are used in each carrier cycle and the action time is equal, the flying capacitor voltage has the ability to self-balance. By adjusting the modulation wave amplitude corresponding to each carrier, the flying capacitor voltage can be dynamically adjusted under transient conditions. However, due to the phase shift between the carriers, the synthesized level pulses will be phase shifted, and level overlap will occur when synthesizing the line voltage, and the harmonic performance is inferior to PDPWM.

[0004] In summary, the existing carrier modulation technology cannot take into account both the flying capacitor voltage self-balancing and the optimal line voltage harmonic characteristics. Summary of the invention

[0005] The purpose of the embodiments of this specification is to provide a carrier reconstruction modulation method, device, electronic device and storage medium.

[0006] To solve the above technical problems, the embodiments of the present application are implemented in the following ways:

[0007] In a first aspect, the present application provides a carrier reconstruction modulation method, which is applied to a flying capacitor type multi-level rectifier, wherein the flying capacitor type multi-level rectifier includes a plurality of pairs of power tubes, and the method includes:

[0008] Obtaining a symmetrical triangle carrier and a modulation wave of a flying capacitor type multi-level rectifier;

[0009] Based on the symmetrical triangular carrier, a multi-segment sawtooth carrier is constructed;

[0010] According to the multi-segment sawtooth carrier, the carrier corresponding to each pair of power tubes is determined;

[0011] Decomposing the modulated wave to obtain decomposed modulated waves corresponding to each carrier wave;

[0012] According to the carrier waves corresponding to each pair of power tubes and the decomposed modulation waves corresponding to each pair of power tubes, the switching signals of each pair of power tubes are determined to control the operation of the flying capacitor type multi-level rectifier.

[0013] In one embodiment, a multi-segment sawtooth carrier is constructed based on a symmetrical triangular carrier, including:

[0014] Obtaining the number of levels of a flying capacitor type multi-level rectifier;

[0015] According to the number of levels of the flying capacitor multi-level rectifier and the symmetrical triangular carrier, a multi-segment sawtooth carrier is constructed.

[0016] In one embodiment, a multi-segment sawtooth carrier is constructed according to the number of levels of a flying capacitor type multi-level rectifier and a symmetrical triangular carrier, including:

[0017] If the number of levels of the flying capacitor type multi-level rectifier is n, there are (n-1) / 2 symmetrical triangular carriers C1, C2, ..., C (n-1) / 2 , the phase angle difference between adjacent symmetrical triangular carriers is 2π / (n-1);

[0018] All symmetrical triangular carriers are divided into (n-1) / 2 intervals according to their amplitudes. When the modulated wave belongs to interval z, where z = 1, 2…(n-1) / 2, a symmetrical triangular carrier C is selected in interval z. z The two sub-parts of lz 、s rz ;

[0019] Connect all subsections s of the symmetrical triangular carrier in sequence l(n -1) / 2… sl2 、s l1 、s r1 、s r2 …s r(n-1) / 2 , and obtain multiple segments of sawtooth carrier.

[0020] In one embodiment, the amplitude of each symmetrical triangular carrier wave is 1.

[0021] In one embodiment, determining the carrier corresponding to each pair of power tubes according to the multi-segment sawtooth carrier includes:

[0022] Phase shifting is performed on multiple sawtooth carriers to obtain carriers corresponding to each pair of power tubes, and the phase difference between carriers corresponding to adjacent power tubes in each pair of power tubes is 4π / (n-1).

[0023] In one embodiment, decomposing the modulated wave to obtain decomposed modulated waves corresponding to each carrier wave includes:

[0024] The modulation wave m x Decompose into m x1 、m x2 …m x(n-1) / 2 , respectively corresponding to the carriers corresponding to each pair of power tubes, satisfying:

[0025]

[0026] Where Δm xf1 , Δm xf2 …Δm xf(n-3) / 2 To realize the flying capacitor C xf1 , C xf2 …C xf(n-3) / 2 The amount of regulation required for voltage balance satisfies:

[0027]

[0028] Among them, K p is the proportionality coefficient, V* xfy 、V xfy They are respectively the flying capacitor C xfy The set value and sampling value of i x is the bridge arm phase current, which satisfies Δm in steady state xf1 =Δm xf2 =……=Δm xf(n-3) / 2 =0.

[0029] In one embodiment, determining the switch signal of each pair of power tubes according to the carrier waves corresponding to each pair of power tubes and the decomposed modulation waves corresponding to each pair of power tubes includes:

[0030] The decomposed modulated wave is compared with the carrier wave corresponding to each pair of power tubes to obtain the switching signal of one of the power tubes in each pair of power tubes. The switching signal of the other power tube in each pair of power tubes is complementary to the switching signal of one of the power tubes in each pair of power tubes.

[0031] In a second aspect, the present application provides a carrier reconstruction modulation device, which is applied to a flying capacitor type multi-level rectifier, the flying capacitor type multi-level rectifier includes a plurality of pairs of power tubes, and the device includes:

[0032] An acquisition module, used for acquiring a symmetrical triangular carrier and a modulation wave of a flying capacitor type multi-level rectifier;

[0033] A construction module, used for constructing a multi-segment sawtooth carrier according to a symmetrical triangular carrier;

[0034] A determination module, used to determine the carrier corresponding to each pair of power tubes according to the multi-segment sawtooth carrier;

[0035] A decomposition module is used to decompose the modulated wave to obtain a decomposed modulated wave corresponding to each carrier;

[0036] The processing module is used to determine the switching signal of each pair of power tubes according to the carrier waves corresponding to each pair of power tubes and the decomposed modulation waves corresponding to each pair of power tubes, so as to control the operation of the flying capacitor type multi-level rectifier.

[0037] In a third aspect, the present application provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the carrier reconstruction modulation method of the first aspect is implemented.

[0038] In a fourth aspect, the present application provides a readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the carrier reconstruction modulation method of the first aspect.

[0039] It can be seen from the technical solution provided in the above embodiments of this specification that:

[0040] By constructing a multi-segment sawtooth carrier corresponding to each pair of power tubes and comparing it with the decomposed modulation wave, the power tube switching signal is directly generated, so that it can take into account both the self-balancing of the flying capacitor voltage and the optimal line voltage harmonic characteristics, which is conducive to simplifying the input filter design and reducing the difficulty of flying capacitor voltage control, and is simple to implement.

[0041] By decomposing the modulation wave, active regulation of the flying capacitor voltage can be achieved under transient conditions. The switching signal of each power tube is directly generated after comparing the decomposed modulation wave with the multi-segment sawtooth carrier corresponding to each pair of power tubes constructed, which can avoid direct switching between redundant switching states and reduce switching losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0043] Figure 1 A flow chart of the carrier reconstruction modulation method provided in this application;

[0044] Figure 2 It is a single-phase topology diagram of a flying capacitor type multi-level rectifier;

[0045] Figure 3 It is a three-phase topology diagram of a flying capacitor type multi-level rectifier;

[0046] Figure 4 A multi-segment sawtooth carrier constructed of a symmetrical triangle carrier of an n-level rectifier provided in the present application;

[0047] Figure 5 The multi-segment sawtooth carrier constructed when n=7 provided in the present application;

[0048] Figure 6 The waveform diagram of phase voltage and line voltage when n=7 provided in this application;

[0049] Figure 7 A schematic diagram of the structure of the carrier reconstruction modulation device provided in this application;

[0050] Figure 8 A schematic diagram of the structure of the electronic device provided in this application. DETAILED DESCRIPTION

[0051] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this specification.

[0052] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0053] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present application description without departing from the scope or spirit of the present application. Other embodiments derived from the present application description will be apparent to those skilled in the art. The present application description and examples are exemplary only.

[0054] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0055] Unless otherwise specified, "parts" in this application are all calculated by mass.

[0056] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0057] Reference Figure 1 , which shows a flow chart of a carrier reconstruction modulation method applicable to an embodiment of the present application. The carrier reconstruction modulation method is applied to a flying capacitor type multi-level rectifier. Figure 2 and Figure 3 They are the single-phase and three-phase topologies of the flying capacitor type multi-level rectifier, respectively. The flying capacitor type multi-level rectifier consists of (n-3) / 2 two-level units and one three-level unit (n represents the number of rectifier levels, n≥5 and is an odd number); the three-level unit consists of DC capacitors C1, C2 and diode D x1 , D x2 , D x3 , D x4 (The subscript x represents the bridge arms a, b, c) and the power tube pair (S x(n-1) / 2 ,S′ x(n-1) / 2 ), capacitors C1 and C2 are connected in series, D x1 , D x2 , D x3 , D x4 Connect end to end, D x1 The cathode is connected to the positive terminal of C1, D x2 Cathode and S x(n-1) / 2 Collector connected, D x3 The cathode is connected to the midpoint o of C1 and C2, D x4 Cathode and S′ x(n-1) / 2 The emitter is connected, Dx4 The anode is connected to the negative electrode of C2. Each two-level unit consists of a flying capacitor C xfy And a pair of power tubes (S xy ,S′ xy ) (where the subscript y represents the yth two-level unit, satisfying y=1,2…(n-3) / 2), each two-level unit has S xy The collector and C xfy Positive electrode connected, S' xy The emitter and C xfy The negative electrode of the first two-level unit is connected; x1 Emitter and S′ x1 The collectors are directly connected, and the S x2 Emitter, S′ x2 The collector is connected to the S x1 Collector, S' x1 The emitter is connected, and the S x3 Emitter, S′ x3 The collector is connected to the S x2 Collector, S' x2 The emitter is connected, and so on to the S in the (n-3) / 2th two-level unit. x(n-3) / 2 Emitter, S′ x(n-3) / 2 The collector is connected to the S in the (n-5) / 2th two-level unit. x(n-5) / 2 Collector, S' x(n-5) / 2 The emitter is connected, and the S in the (n-3) / 2nd two-level unit x(n-3) / 2 Collector, S' x(n-3) / 2 The emitter is connected to the S x(n-1) / 2 Emitter, S′ x(n-1) / 2 Collector connected; the total voltage on the DC side is V dc , basic voltage unit E = V dc / (n-1),V xfy (corresponding to yE in the figure, i.e. E, 2E, ..., (n-3)E / 2) represents the voltage of the yth (y≤(n-3) / 2) flying capacitor, the DC side capacitor voltage V1, V2 and the (n-3) / 2 flying capacitor voltage V xfy Satisfying the relationship: V1 = V2 = (n-1)E / 2, V xfy =yE; the three-phase bridge arms are the same and share the DC capacitors C1 and C2.

[0058] like Figure 1 As shown, the carrier reconstruction modulation method may include:

[0059] S110, obtaining a symmetrical triangular carrier and a modulation wave of a flying capacitor type multi-level rectifier.

[0060] S120, constructing a multi-segment sawtooth carrier according to the symmetrical triangular carrier, including:

[0061] Obtaining the number of levels of a flying capacitor type multi-level rectifier;

[0062] According to the number of levels of the flying capacitor multi-level rectifier and the symmetrical triangular carrier, a multi-segment sawtooth carrier is constructed.

[0063] In one embodiment, a multi-segment sawtooth carrier is constructed according to the number of levels of a flying capacitor type multi-level rectifier and a symmetrical triangular carrier, including:

[0064] If the number of levels of the flying capacitor type multi-level rectifier is n, there are (n-1) / 2 symmetrical triangular carriers C1, C2, ..., C (n-1) / 2 , the phase angle difference between adjacent symmetrical triangle carriers is 2π / (n-1); optionally, the amplitude of each symmetrical triangle carrier is 1. It can be understood that the amplitudes of all symmetrical triangle carriers are equal, and the amplitudes of all symmetrical triangle carriers can be set according to actual needs.

[0065] All symmetrical triangular carriers are divided into (n-1) / 2 intervals according to their amplitudes. When the modulated wave belongs to interval z, where z = 1, 2…(n-1) / 2, a symmetrical triangular carrier C is selected in interval z. z The two sub-parts of lz 、s rz ;

[0066] Connect all subsections s of the symmetrical triangular carrier in sequence l(n -1) / 2… sl2 、s l1 、s r1 、s r2 …s r(n-1) / 2 , and obtain multiple segments of sawtooth carrier.

[0067] Specifically, if the number of levels of the flying capacitor type multi-level rectifier is n, there are (n-1) / 2 periods of T s The symmetrical triangular carriers C1, C2, ..., C (n-1) / 2 , the phase angle difference between adjacent symmetrical triangular carriers is 2π / (n-1), such as Figure 4 shown.

[0068] The symmetrical triangular carrier is divided into (n-1) / 2 intervals according to the amplitude, and the height of each interval is 2 / (n-1). When the modulated wave belongs to interval z, the symmetrical triangular carrier C corresponding to the interval is selected. z , in this interval the symmetrical triangular carrier C z It consists of two sub-parts, named slz 、s rz ;

[0069] Connect all subsections s of the symmetrical triangular carrier in sequence l(n -1) / 2… sl2 、s l1 、s r1 、s r2 …s r(n-1) / 2 , the new type of carrier formed by the combination is a multi-segment sawtooth carrier.

[0070] S130, determining the carrier corresponding to each pair of power tubes according to the multiple sawtooth carriers, including:

[0071] Phase shifting is performed on multiple sawtooth carriers to obtain carriers corresponding to each pair of power tubes, and the phase difference between carriers corresponding to adjacent power tubes in each pair of power tubes is 4π / (n-1).

[0072] Specifically, the multi-segment sawtooth carrier obtained in step S120 can be used as the carrier corresponding to any pair of power tubes. The carriers corresponding to other pairs of power tubes can be obtained by phase shifting the multi-segment sawtooth carrier, wherein the phase difference between the carriers corresponding to adjacent power tubes is 4π / (n-1).

[0073] Exemplarily, the multi-segment sawtooth carrier obtained in step S120 is used as a power tube pair (S x1 ,S′ x1 ) carrier, named T r1 , for T r1 Shift the phase to the right by 4π / (n-1) to obtain the power tube pair (S x2 ,S′ x2 ) carrier, named T r2 , and so on, until the power tube pair (S x(n-1) / 2 ,S′ x(n-1) / 2 ) carrier, named T (n-1) / 2 .

[0074] S140, decompose the modulated wave to obtain decomposed modulated waves corresponding to each carrier.

[0075] Specifically, the original modulation signal is normalized to half of the total voltage on the DC side and normalized to between 0 and 1. x express.

[0076] The modulation wave m x Decompose into m x1 、m x2 …m x(n-1) / 2 , respectively corresponding to the carrier T of each pair of power tubes r1 , T r2 , Tr3 …T (n-1) / 2 Corresponding to, satisfying:

[0077]

[0078] Where Δm xf1 , Δm xf2 …Δm xf(n-3) / 2 To realize the flying capacitor C xf1 , C xf2 …C xf(n-3) / 2 The amount of regulation required for voltage balance satisfies:

[0079]

[0080] Among them, K p is the proportionality coefficient, V* xfy 、V xfy They are respectively the flying capacitor C xfy The set value and sampling value of i x is the bridge arm phase current, which satisfies Δm in steady state xf1 =Δm xf2 =……=Δm xf(n-3) / 2 =0.

[0081] S150, determining the switching signals of each pair of power tubes according to the carrier waves corresponding to each pair of power tubes and the decomposed modulation waves corresponding to each pair of power tubes, so as to control the operation of the flying capacitor type multi-level rectifier.

[0082] Wherein, according to the carrier waves corresponding to each pair of power tubes and the decomposed modulation waves corresponding to each pair of power tubes, the switching signals of each pair of power tubes are determined, including:

[0083] The decomposed modulated wave is compared with the carrier wave corresponding to each pair of power tubes to obtain the switching signal of one of the power tubes in each pair of power tubes. The switching signal of the other power tube in each pair of power tubes is complementary to the switching signal of one of the power tubes in each pair of power tubes.

[0084] Specifically, the decomposed modulated wave m x1 、m x2 …m x(n-1) / 2 The carrier T corresponding to each pair of power tubes r1 , T r2 , T r3 …T (n-1) / 2 By comparison, if the decomposed modulation wave m xz (z=1,2…(n-1) / 2) is greater than the carrier T corresponding to the corresponding power tube rz , then we get one of the power tubes S in the corresponding power tube pair xz The switching signal of the power tube S is 1. xzconduction, otherwise it is closed; the power tube is aligned with another power tube S' xz The switching signal and power tube S xz The switching signals are complementary.

[0085] The carrier reconstruction modulation method provided by the present application is described below using n=7 as an example.

[0086] 1) According to the level number n of the flying capacitor type multi-level rectifier and the symmetrical triangular carrier, a multi-segment sawtooth carrier is constructed.

[0087] For a 7-level rectifier, there are 3 periods of T s The symmetrical triangular carriers C1, C2, and C3 all have amplitudes of 1, and the phase angles of adjacent symmetrical triangular carriers differ by π / 3;

[0088] The symmetrical triangular carrier is divided into three intervals according to the amplitude, and the height of each interval is 1 / 3. When the modulated wave belongs to interval z (z = 1, 2, 3), the corresponding symmetrical triangular carrier C is selected. z , which consists of two sub-parts, named s lz 、s rz ;

[0089] Connect the carrier sub-parts in sequence l3 、s l2 、s l1 、s r1 、s r2 、s r3 , the new type of carrier combined is a multi-segment sawtooth carrier, such as Figure 5 shown.

[0090] 2) Phase shifting is performed on multiple segments of sawtooth carriers to obtain carriers corresponding to each pair of power tubes.

[0091] Corresponding (S x1 ,S′ x1 )、(S x2 ,S′ x2 )、(S x3 ,S′ x3 ) are named T r1 , T r2 , T r3 , the phase difference is 2π / 3 respectively.

[0092] 3) Decompose the modulated wave to obtain the decomposed modulated wave corresponding to each carrier.

[0093] The original modulation signal is normalized to half of the total voltage on the DC side and normalized to between 0 and 1. x express;

[0094] The modulation wave mx Decompose into m x1 、m x2 、m x3 , respectively with the carrier T r1 , T r2 , T r3 Corresponding, satisfying

[0095]

[0096] Where Δm xf1 , Δm xf2 To realize the flying capacitor C xf1 , C xf2 The amount of regulation required for voltage balance is to meet

[0097]

[0098] Where K p is the proportionality coefficient, V* xfy 、V xfy They are respectively the flying capacitor C xfy The set value and sampling value of i x is the bridge arm phase current. Under steady-state conditions, Δm xf1 =Δm xf2 =0.

[0099] 4) Compare the decomposed modulated wave with the carrier waves corresponding to each pair of power tubes to obtain the switching signals of each pair of power tubes and control the operation of the rectifier.

[0100] M x1 、m x2 、m x3 , respectively with multi-segment sawtooth carrier T r1 , T r2 , T r3 Compare the power tube S x1 , S x2 , S x3 The switching signal, S′ x1 , S′ x2 , S′ x3 The switching signals are respectively x1 , S x2 , S x3 Complementary.

[0101] The generated phase voltage waveform and line voltage waveform are as follows Figure 6 shown.

[0102] The carrier reconstruction modulation method provided in the embodiment of the present application constructs a multi-segment sawtooth carrier corresponding to each pair of power tubes, and directly generates a power tube switching signal after comparing with the decomposed modulation wave, so that it takes into account the self-balancing of the flying capacitor voltage and the optimal line voltage harmonic characteristics, which is beneficial to simplify the input filter design and reduce the difficulty of flying capacitor voltage control, and is simple to implement.

[0103] The carrier reconstruction modulation method provided in the embodiment of the present application can realize active regulation of the flying capacitor voltage under transient conditions by decomposing the modulation wave, and directly generates a switching signal for each power tube after comparing the decomposed modulation wave with the multi-segment sawtooth carrier corresponding to each pair of constructed power tubes, thereby avoiding direct switching between redundant switching states and reducing switching losses.

[0104] Reference Figure 7 , which shows a structural schematic diagram of a carrier reconstruction modulation device described according to an embodiment of the present application.

[0105] like Figure 7 As shown, the carrier reconstruction modulation device 700 is applied to a flying capacitor type multi-level rectifier, and the flying capacitor type multi-level rectifier includes several pairs of power tubes, which may include:

[0106] An acquisition module 710 is used to acquire a symmetrical triangular carrier and a modulation wave of a flying capacitor type multi-level rectifier;

[0107] A construction module 720 is used to construct a multi-segment sawtooth carrier according to a symmetrical triangular carrier;

[0108] A determination module 730 is used to determine the carrier corresponding to each pair of power tubes according to the multiple sawtooth carriers;

[0109] A decomposition module 740 is used to decompose the modulated wave to obtain a decomposed modulated wave corresponding to each carrier;

[0110] The processing module 750 is used to determine the switching signal of each pair of power tubes according to the carrier waves corresponding to each pair of power tubes and the decomposed modulation waves corresponding to each pair of power tubes, so as to control the operation of the flying capacitor type multi-level rectifier.

[0111] Optionally, the construction module 720 is further used for:

[0112] Obtaining the number of levels of a flying capacitor type multi-level rectifier;

[0113] According to the number of levels of the flying capacitor multi-level rectifier and the symmetrical triangular carrier, a multi-segment sawtooth carrier is constructed.

[0114] Optionally, the construction module 720 is further used for:

[0115] If the number of levels of the flying capacitor type multi-level rectifier is n, there are (n-1) / 2 symmetrical triangular carriers C1, C2, ..., C (n-1) / 2 , the phase angle difference between adjacent symmetrical triangular carriers is 2π / (n-1);

[0116] All symmetrical triangular carriers are divided into (n-1) / 2 intervals according to their amplitudes. When the modulated wave belongs to interval z, where z = 1, 2…(n-1) / 2, a symmetrical triangular carrier C is selected in interval z. z The two sub-parts of lz 、s rz ;

[0117] Connect all subsections s of the symmetrical triangular carrier in sequence l(n -1) / 2… sl2 、s l1 、s r1 、s r2 …s r(n-1) / 2 , and obtain multiple segments of sawtooth carrier.

[0118] Optionally, the amplitude of each symmetrical triangular carrier is 1.

[0119] Optionally, the determination module 730 is further configured to:

[0120] Phase shifting is performed on multiple sawtooth carriers to obtain carriers corresponding to each pair of power tubes. The phase difference between carriers corresponding to adjacent power tubes in each pair of power tubes is 4π / (n-1).

[0121] Optionally, the decomposition module 740 is further configured to:

[0122] The modulation wave m x Decompose into m x1 、m x2 …m x(n-1) / 2 , respectively corresponding to the carriers corresponding to each pair of power tubes, satisfying:

[0123]

[0124] Where Δm xf1 , Δm xf2 …Δm xf(n-3) / 2 To realize the flying capacitor C xf1 , C xf2 …C xf(n-3) / 2 The amount of regulation required for voltage balance satisfies:

[0125]

[0126] Among them, K p is the proportionality coefficient, V* xfy 、V xfyThey are respectively the flying capacitor C xfy The set value and sampling value of i x is the bridge arm phase current, which satisfies Δm in steady state xf1 =Δm xf2 =……=Δm xf(n-3) / 2 =0.

[0127] Optionally, the processing module 750 is further configured to:

[0128] The decomposed modulated wave is compared with the carrier wave corresponding to each pair of power tubes to obtain the switching signal of one of the power tubes in each pair of power tubes. The switching signal of the other power tube in each pair of power tubes is complementary to the switching signal of one of the power tubes in each pair of power tubes.

[0129] A carrier reconstruction modulation device provided in this embodiment can execute the embodiment of the above method. Its implementation principle and technical effect are similar and will not be described in detail here.

[0130] Figure 8 FIG. 1 is a schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. Figure 8 As shown, a structural schematic diagram of an electronic device 800 suitable for implementing an embodiment of the present application is shown.

[0131] like Figure 8 As shown, the electronic device 800 includes a central processing unit (CPU) 801, which can perform various appropriate actions and processes according to the program stored in the read-only memory (ROM) 802 or the program loaded from the storage part 808 into the random access memory (RAM) 803. In the RAM 803, various programs and data required for the operation of the device 800 are also stored. The CPU 801, the ROM 802, and the RAM 803 are connected to each other via a bus 804. An input / output (I / O) interface 805 is also connected to the bus 804.

[0132] The following components are connected to the I / O interface 805: an input section 806 including a keyboard, a mouse, etc.; an output section 807 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.; a storage section 808 including a hard disk, etc.; and a communication section 809 including a network interface card such as a LAN card, a modem, etc. The communication section 809 performs communication processing via a network such as the Internet. A drive 810 is also connected to the I / O interface 806 as needed. A removable medium 811, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 810 as needed, so that a computer program read therefrom is installed into the storage section 808 as needed.

[0133] In particular, according to the embodiments of the present disclosure, the above reference Figure 1 The described process can be implemented as a computer software program. For example, an embodiment of the present disclosure includes a computer program product, which includes a computer program tangibly contained on a machine-readable medium, and the computer program includes program code for executing the above-mentioned carrier reconstruction modulation method. In such an embodiment, the computer program can be downloaded and installed from a network through the communication part 809, and / or installed from a removable medium 811.

[0134] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present invention. In this regard, each box in the flow chart or block diagram can represent a module, a program segment, or a part of the code, and the aforementioned module, program segment, or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flow chart, and the combination of the boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0135] The units or modules involved in the embodiments described in the present application may be implemented by software or hardware. The units or modules described may also be arranged in a processor. The names of these units or modules do not constitute limitations on the units or modules themselves in certain circumstances.

[0136] The systems, devices, modules or units described in the above embodiments may be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer. Specifically, the computer may be, for example, a personal computer, a laptop, a mobile phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0137] As another aspect, the present application further provides a storage medium, which may be the storage medium included in the aforementioned device in the above embodiment; or may be a storage medium that exists independently and is not assembled into the device. The storage medium stores one or more programs, and the aforementioned programs are used by one or more processors to execute the carrier reconstruction modulation method described in the present application.

[0138] Storage media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include temporary computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0139] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of further restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0140] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

Claims

1. A carrier reconstruction modulation method, applied to a flying capacitor type multi-level rectifier, wherein the flying capacitor type multi-level rectifier comprises a plurality of pairs of power tubes, characterized in that: The method comprises: Acquire a symmetrical triangular carrier and a modulation wave of the flying capacitor type multi-level rectifier; According to the symmetrical triangular carrier, a multi-segment sawtooth carrier is constructed, including: Obtaining the number of levels of the flying capacitor type multi-level rectifier; According to the number of levels of the flying capacitor type multi-level rectifier and the symmetrical triangular carrier, the multi-segment sawtooth carrier is constructed, including: If the number of levels of the flying capacitor type multi-level rectifier is n, there are (n-1) / 2 symmetrical triangular carriers C1, C2, ..., C (n-1) / 2 , the phase angle difference between adjacent symmetrical triangular carriers is 2π / (n-1); All the symmetrical triangular carrier waves are divided into (n-1) / 2 intervals according to their amplitudes. When the modulated wave belongs to interval z, where z=1,2…(n-1) / 2, the symmetrical triangular carrier wave C is selected in the interval z. z The two sub-parts of lz 、s rz ; Connect all the sub-parts s of the symmetrical triangular carrier in sequence l(n-1) / 2 … sl2 、s l1 、s r1 、s r2 …s r(n-1) / 2 , obtaining the multi-segment sawtooth carrier; Determining carrier waves corresponding to each pair of power tubes according to the multiple-segment sawtooth carrier waves includes: Phase shifting is performed on the multiple-segment sawtooth carriers to obtain carriers corresponding to each pair of the power tubes, wherein the phase difference between the carriers corresponding to adjacent power tubes in each pair of the power tubes is 4π / (n-1); Decomposing the modulated wave to obtain a decomposed modulated wave corresponding to each of the carrier waves includes: The modulation wave m x Decompose into m x1 、m x2 …m x(n-1) / 2 , respectively corresponding to the carriers corresponding to each pair of the power tubes, satisfying: Where Δm xf1 , Δm xf2 …Δm xf(n-3) / 2 To realize the flying capacitor C xf1 , C xf2 …C xf(n-3) / 2 The amount of regulation required for voltage balance satisfies: Among them, K p is the proportionality coefficient, V* xfy 、V xfy They are respectively the flying capacitor C xfy The set value and sampling value of i x is the bridge arm phase current, which satisfies Δm in steady state xf1 =Δm xf2 =……=Δm xf(n-3) / 2 =0, where the subscript y represents the yth two-level unit, satisfying y=1,2…(n-3) / 2); According to the carrier waves corresponding to each pair of the power tubes and the decomposed modulation waves corresponding to each pair, the switching signals of each pair of the power tubes are determined to control the operation of the flying capacitor type multi-level rectifier.

2. The method according to claim 1, characterized in that The amplitude of each of the symmetrical triangular carrier waves is 1.

3. The method according to claim 1, characterized in that Determining the switch signals of each pair of the power tubes according to the carrier waves corresponding to each pair of the power tubes and the decomposed modulation waves corresponding to each pair of the power tubes comprises: The decomposed modulated wave is compared with the carrier waves corresponding to each pair of the power tubes to obtain a switching signal of one of the power tubes in each pair of the power tubes, and the switching signal of the other power tube in each pair of the power tubes is complementary to the switching signal of one of the power tubes in each pair of the power tubes.

4. A carrier reconstruction modulation device, applied to a flying capacitor type multi-level rectifier, wherein the flying capacitor type multi-level rectifier comprises a plurality of pairs of power tubes, characterized in that: The device comprises: An acquisition module, used for acquiring a symmetrical triangular carrier and a modulation wave of the flying capacitor type multi-level rectifier; A construction module, used to construct a multi-segment sawtooth carrier according to the symmetrical triangular carrier, comprising: Obtaining the number of levels of the flying capacitor type multi-level rectifier; According to the number of levels of the flying capacitor type multi-level rectifier and the symmetrical triangular carrier, the multi-segment sawtooth carrier is constructed, including: If the number of levels of the flying capacitor type multi-level rectifier is n, there are (n-1) / 2 symmetrical triangular carriers C1, C2, ..., C (n-1) / 2 , the phase angle difference between adjacent symmetrical triangular carriers is 2π / (n-1); All the symmetrical triangular carrier waves are divided into (n-1) / 2 intervals according to their amplitudes. When the modulated wave belongs to interval z, where z=1,2…(n-1) / 2, the symmetrical triangular carrier wave C is selected in the interval z. z The two sub-parts of lz 、s rz ; Connect all the sub-parts s of the symmetrical triangular carrier in sequence l(n-1) / 2 … sl2 、s l1 、s r1 、s r2 …s r(n-1) / 2 , obtaining the multi-segment sawtooth carrier; A determination module, used to determine the carrier corresponding to each pair of the power tubes according to the multiple-segment sawtooth carrier, including: Phase shifting is performed on the multiple-segment sawtooth carriers to obtain carriers corresponding to each pair of the power tubes, wherein the phase difference between the carriers corresponding to adjacent power tubes in each pair of the power tubes is 4π / (n-1); A decomposition module, used to decompose the modulated wave to obtain a decomposed modulated wave corresponding to each of the carrier waves, including: The modulation wave m x Decompose into m x1 、m x2 …m x(n-1) / 2 , respectively corresponding to the carriers corresponding to each pair of the power tubes, satisfying: Where Δm xf1 , Δm xf2 …Δm xf(n-3) / 2 To realize the flying capacitor C xf1 , C xf2 …C xf(n-3) / 2 The amount of regulation required for voltage balance satisfies: Among them, K p is the proportionality coefficient, V* xfy 、V xfy They are respectively the flying capacitor C xfy The set value and sampling value of i x is the bridge arm phase current, which satisfies Δm in steady state xf1 =Δm xf2 =……=Δm xf(n-3) / 2 =0, where the subscript y represents the yth two-level unit, satisfying y=1,2…(n-3) / 2); The processing module is used to determine the switching signal of each pair of the power tubes according to the carrier waves corresponding to each pair of the power tubes and the decomposed modulation waves corresponding to each pair of the power tubes, so as to control the operation of the flying capacitor type multi-level rectifier.

5. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the carrier reconstruction modulation method as described in any one of claims 1-3 is implemented.

6. A readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the carrier reconstruction modulation method as described in any one of claims 1 to 3 is implemented.

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