CN115498895A - Modular capacitor voltage balance control method of modular multilevel matrix converter - Google Patents
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M5/275—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/293—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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Abstract
The invention discloses a modular capacitor voltage balance control method of a modular multilevel matrix converter, which is characterized in that the additional balance current is added with d-axis current at a power frequency side and a frequency division side respectively, and then a current inner loop is carried out to obtain a modulation wave controlled by input and output; adding the additional modulation wave of the bridge arm and the modulation wave of the input and output control to obtain a final modulation wave signal of the modular multilevel matrix converter; and carrying out module capacitance voltage balance control on the modular multi-level matrix converter according to the final modulation wave signal of the modular multi-level matrix converter, wherein the method can realize the voltage capacitance balance of the modular multi-level matrix converter.
Description
Technical Field
The invention belongs to the field of control strategies of high-voltage and high-power conversion devices, and relates to a module capacitor voltage balance control method of a modular multi-level matrix converter.
Background
The modular multilevel matrix converter (M3C) is a novel AC/AC converter, can realize the bidirectional flow of energy, has a series of technical advantages of high electric energy quality, high reliability, high controllability, easy expansibility and the like, and has wide application prospect in high-power and medium-high voltage systems.
The M3C realizes the transmission of alternating current energy by means of the sub-module capacitors, and the capacitor voltage balance is the premise that the whole system works normally and reliably. Therefore, voltage-sharing control must be carried out on the voltage of the M3C capacitor, and reliable operation of the converter is guaranteed. However, power transfer between the input side and the output side may cause fluctuation of the capacitor voltage of the M3C sub-module, which may cause difficulty in the voltage equalizing step. Chinese patent CN107240922a proposes an M3C circulation voltage-sharing method, in which the given dc voltage values of M3C 9 bridge arms are compared with the mean value to obtain 9 active currents, but after proportional-integral control, adverse effects may be generated on the input and output sides, and M3C voltage-capacitance balance cannot be achieved.
Disclosure of Invention
The present invention is directed to overcome the above-mentioned shortcomings of the prior art, and provides a method for controlling the voltage balance of a modular capacitor of a modular multilevel matrix converter, which can achieve the voltage balance of the modular multilevel matrix converter.
In order to achieve the above object, the method for controlling voltage balance of a module capacitor of a modular multilevel matrix converter according to the present invention comprises the following steps:
1) Subtracting the average capacitance voltage of nine bridge arms from the capacitance voltage of a single bridge arm, and obtaining the equivalent direct current circulating current of the bridge arm by the obtained difference value through proportional integral control and quasi-proportional resonance control;
2) Multiplying the equivalent direct current circulation by 1 or-1 according to the current direction of the bridge arms to obtain additional balanced voltage, and carrying out normalization and amplitude limiting processing on the additional balanced voltage to obtain additional modulation waves of each bridge arm;
3) In voltage-sharing control of the additional balanced voltage of the modular multilevel matrix converter, performing step 1) and step 2) on four bridge arms, and obtaining modulation waves of the rest four bridge arms by a first constraint condition;
4) In voltage-sharing control of the additional balance current of the modular multi-level matrix converter, executing step 1) on four bridge arms in the modular multi-level matrix converter, dividing equivalent direct current circulating currents of the four bridge arms by modulated waves of the four bridge arms to obtain circulating currents of the four bridge arms, obtaining circulating currents of the other four bridge arms by a second constraint condition, and obtaining the additional balance current after Clark conversion and Park conversion are carried out on the circulating currents of all the bridge arms in the modular multi-level matrix converter;
5) Adding the additional balance current with d-axis currents of a power frequency side and a frequency division side respectively, and obtaining a modulation wave controlled by input and output through a current inner ring; adding the additional modulation wave of the bridge arm and the modulation wave of the input and output control to obtain a final modulation wave signal of the modular multilevel matrix converter;
6) And carrying out module capacitor voltage balance control on the modular multi-level matrix converter according to the final modulation wave signal of the modular multi-level matrix converter.
The specific operation of step 6) is: and acquiring a triangular carrier signal of the modular multi-level matrix converter, performing difference on the final modulation wave signal and the triangular carrier signal, and acquiring a PWM signal of an actual switch in each full-bridge module in a bridge arm according to a difference result, wherein the PWM signal controls the state of the actual switch of each full-bridge module in each bridge arm, so that the module capacitance voltage balance control of the modular multi-level matrix converter is realized.
The specific operation process of the step 1) is as follows:
11 Let the capacitor voltage of the bridge arm be V xy_dc (x∈{ u, v, w }, y ∈ { a, b, c }), and the average capacitance voltage of nine bridge arms is
Wherein the content of the first and second substances,
bridge arm current of i xy (x∈{u,v,w},y∈{a,b,c})；
12 Average capacitor voltage of nine bridge arms
With capacitor voltage V of a single bridge arm xy_dc Subtracting, and obtaining a first part of equivalent direct current circulation i after the obtained difference value passes through a proportional-integral controller xy_dc_cir1 (x belongs to { u, v, w }, y belongs to { a, b, c }), and the obtained difference value is processed by a quasi-proportional resonant controller to obtain the equivalent direct current circulating current i of the second part xy_dc_cir2 (x e { u, v, w }, y e { a, b, c }), and the first part is equivalent to a direct current circulation current i xy_dc_cir1 (x e { u, v, w }, y e { a, b, c }) and the second part equivalent direct current circulation i xy_dc_cir2 (x is belonged to { u, v, w }, y is belonged to { a, b, c }) are added to obtain the final equivalent direct current circulating current i of each bridge arm xy_dc_cir (x∈{u,v,w},y∈{a,b,c})。
The specific process of the step 2) is as follows:
21 Set the additional balancing voltage to:
22 Normalizing the additional balancing voltage to limit the amplitude to [ -0.1,0.1]In between, obtain an additional modulated wave m xy_cir Comprises the following steps:
the specific process of the step 3) is as follows:
31 In voltage-sharing control of each additional balanced voltage, 4 signals are selected from 9 additional modulation waves obtained in the step 22), the rest 4 signals are obtained under a first constraint condition, voltage-sharing control is carried out twice in total, modulation waves of different bridge arms are selected, and the two modulation waves are added to obtain a final additional modulation wave;
wherein the first constraint condition is:
the specific process of the step 4) is as follows:
41 Set bridge arm circulation i xy-cir Comprises the following steps:
wherein, 1/m is xy The amplitude limit is [ -1,1]；
42 In voltage-sharing control of each additional balance current, 4 signals are selected from 9 circulating currents obtained in the step 41), the other 4 signals are obtained under a second constraint condition, circulating currents of different bridge arms are selected, and the two circulating currents are added to obtain a final circulating current;
the second constraint condition is as follows:
43 Coordinate transformation matrix C from a three-phase stationary frame to a two-phase stationary frame abc/αβ0 And inversely transforming the two-phase static coordinate system to the three-phase static coordinate systemCoordinate transformation matrix C of static coordinate system αβ0/abc Circulating current i obtained in step 42) xy_cir (x belongs to { u, v, w }, y belongs to { a, b, c }) to carry out alpha beta 0 transformation;
44 A transformation matrix C from a two-phase stationary coordinate system to a dq0 coordinate system αβ0/dq0_s And C αβ0/dq0_l Performing Park conversion on the result obtained in the step 43);
45 Zero the q-axis current and the 0-sequence current of the matrix in the result obtained in step 44), resulting in an additional balance current of:
the specific process of step 43) is as follows:
coordinate transformation matrix C from three-phase static coordinate system to two-phase static coordinate system abc/αβ0 And a coordinate transformation matrix C for inversely transforming the two-phase static coordinate system into the three-phase static coordinate system αβ0/abc Circulating current i obtained in step 42) xy_cir (x e { u, v, w }, y e { a, b, c }) to perform an α β 0 transformation, wherein,
the specific process of step 44) is as follows:
transformation matrix C from two-phase stationary coordinate system to dq0 coordinate system αβ0/dq0_s And C αβ0/dq0_l To, forPerforming Park transformation on the result obtained in the step 43), wherein,
the invention has the following beneficial effects:
when the modular capacitor voltage balance control method of the modular multilevel matrix converter is operated specifically, the voltage symbol of the additional balance voltage strategy is adjusted according to the direction of bridge arm current so as to be convenient for adjusting the energy injected into the bridge arm capacitor, the additional balance current strategy only changes d-axis current and only controls circulating active power; in addition, in order to prevent circulating power caused by pressure difference from influencing power supplies on two sides, a twice voltage-sharing strategy is used for carrying out voltage-sharing control on 8 bridge arms, the circulating power is guaranteed not to flow out of any star-shaped node, and voltage-capacitance balance of the modular multi-level matrix converter is achieved. In addition, the voltage-sharing method for changing the modulation wave and the bridge arm current is adopted, so that the adjustment speed is high, and the voltage-sharing method is suitable for various operation conditions such as stable operation, faults and the like.
Drawings
FIG. 1 is a schematic diagram of a modular multilevel matrix converter topology;
FIG. 2 is a control block diagram of a module capacitor voltage balance control method of a modular multi-level matrix converter;
FIG. 3 is a block diagram of a voltage sharing strategy for M3C additional balancing voltage;
FIG. 4 is a block diagram of a voltage sharing strategy for M3C additional balancing current;
FIG. 5 is a schematic diagram of a M3C module capacitor voltage balance control method using two voltage sharing cycles;
fig. 6 is a simulation result diagram, (a) a voltage-current waveform diagram at the frequency division side, (b) an active power and reactive power input waveform diagram at the frequency division side, (c) a voltage-current waveform diagram at the power frequency side, (d) an active power and reactive power output diagram at the power frequency side, (e) a bridge arm voltage waveform diagram, and (f) a subconverter c waveform diagram;
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and some details may be omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
The invention is mainly used for the module capacitance voltage balance control of M3C, and is widely applied to the offshore frequency division power transmission field, and FIG. 1 shows a topology structure diagram of M3C, wherein the M3C output side is a frequency division side and is connected with an offshore low-frequency wind power plant; and the input side of the M3C is a power frequency side, is connected with an onshore power frequency power grid and is respectively represented by a, b, C, u, v and w. The M3C power frequency side three-phase input and the frequency division side three-phase output are connected in pairs through nine bridge arms, each bridge arm consists of a bridge arm reactance and n series-connected full-bridge modules, and the table 1 is a main parameter in the M3C simulation system.
TABLE 1
Referring to fig. 2 and 3, the method for controlling voltage balance of the modular capacitor of the modular multilevel matrix converter according to the present invention includes the following steps:
1) Subtracting the average capacitance voltage of nine bridge arms from the capacitance voltage of a single bridge arm, and obtaining the equivalent direct current circulating current of the bridge arm by the obtained difference value through proportional integral control and quasi-proportional resonance control;
2) Multiplying the equivalent direct current circulation by 1 or-1 according to the current direction of the bridge arms to obtain additional balanced voltage, and carrying out normalization and amplitude limiting processing on the additional balanced voltage to obtain additional modulation waves of each bridge arm;
3) In voltage-sharing control of the modular multilevel matrix converter with additional balanced voltage, performing step 1) and step 2) on four bridge arms, and obtaining modulation waves of the rest four bridge arms by a first constraint condition;
4) In voltage-sharing control of the additional balance current of the modular multi-level matrix converter, executing step 1) on four bridge arms in the modular multi-level matrix converter, dividing equivalent direct current circulating currents of the four bridge arms by modulated waves of the four bridge arms to obtain circulating currents of the four bridge arms, obtaining circulating currents of the other four bridge arms by a second constraint condition, and obtaining the additional balance current after Clark conversion and Park conversion are carried out on the circulating currents of all the bridge arms in the modular multi-level matrix converter;
5) Adding the additional balance current with d-axis currents of a power frequency side and a frequency division side respectively, and obtaining a modulation wave controlled by input and output through a current inner ring; adding the additional modulation wave of the bridge arm and the modulation wave of the input and output control to obtain a final modulation wave signal of the modular multilevel matrix converter;
6) And acquiring a triangular carrier signal of the modular multi-level matrix converter, performing difference on the final modulation wave signal and the triangular carrier signal, and acquiring a PWM signal of an actual switch in each full-bridge module in a bridge arm according to a difference result, wherein the PWM signal controls the state of the actual switch of each full-bridge module in each bridge arm, so that the module capacitance voltage balance control of the modular multi-level matrix converter is realized.
The specific operation process of the step 1) is as follows:
11 Let the capacitor voltage of the bridge arm be V xy_dc (x is epsilon { u, v, w }, y is epsilon { a, b, c }), and the average capacitance voltage of the nine bridge arms is
Wherein, the first and the second end of the pipe are connected with each other,
bridge arm current of i xy (x∈{u,v,w},y∈{a,b,c})；
12 Average capacitance voltage of nine bridge arms
Voltage V of capacitor connected with single bridge arm xy_dc Subtracting, and obtaining a first part of equivalent direct current circulation i after the obtained difference value passes through a proportional-integral controller xy_dc_cir1 (x belongs to { u, v, w }, y belongs to { a, b, c }), and the obtained difference value is processed by a quasi-proportional resonant controller to obtain the equivalent direct current circulating current i of the second part xy_dc_cir2 (x e { u, v, w }, y e { a, b, c }), and the first part is equivalent to a direct current circulation current i xy_dc_cir1 (x e { u, v, w }, y e { a, b, c }) and the second part equivalent direct current circulation i xy_dc_cir2 (x belongs to { u, v, w }, y belongs to { a, b, c }) is added to obtain the final equivalent direct current circulating current i of each bridge arm xy_dc_cir (x∈{u,v,w},y∈{a,b,c})。
The specific process of the step 2) is as follows:
21 Set the additional balancing voltage to:
22 Normalizing the additional balancing voltage to limit the magnitude to [ -0.1,0.1]In between, obtain an additional modulated wave m xy_cir Comprises the following steps:
the specific process of the step 3) is as follows:
31 In voltage-sharing control of each additional balanced voltage, 4 signals are selected from 9 additional modulation waves obtained in the step 22), the rest 4 signals are obtained under a first constraint condition, voltage-sharing control is carried out twice in total, modulation waves of different bridge arms are selected, and the two modulation waves are added to obtain a final additional modulation wave;
wherein the first constraint condition is:
referring to fig. 4, the specific process of step 4) is:
41 Set bridge arm circulation i xy-cir Comprises the following steps:
wherein, 1/m is xy The amplitude limit is [ -1,1]；
42 In voltage-sharing control of each additional balance current, 4 signals are selected from 9 circulating currents obtained in the step 41), the other 4 signals are obtained under a second constraint condition, circulating currents of different bridge arms are selected, and the two circulating currents are added to obtain a final circulating current;
the second constraint condition is as follows:
43 Coordinate transformation matrix C from a three-phase stationary frame to a two-phase stationary frame abc/αβ0 And a coordinate transformation matrix C for inversely transforming the two-phase static coordinate system into the three-phase static coordinate system αβ0/abc Circulating current i obtained in step 42) xy_cir (x e { u, v, w }, y e { a, b, c }) to perform an α β 0 transformation, wherein,
44 A transformation matrix C from a two-phase stationary coordinate system to a dq0 coordinate system αβ0/dq0_s And C αβ0/dq0_l Performing Park transformation on the result obtained in the step 43), wherein,
figure 5 shows the principle of the invention using two pressure equalization cycles. The white circles indicate that the circulating current or the additional modulation wave of the bridge arms is obtained by calculation of a voltage control loop, the black triangles indicate that the circulating current or the additional modulation wave of the bridge arms is obtained by constraint conditions, the difference value between the capacitor voltage of 8 bridge arms and the average capacitor voltage is adjusted to be 0 after two voltage-sharing cycles, voltage sharing among 9 bridge arms can be completed, the additional modulation wave and the additional bridge arm current of two cycles are added respectively, and the additional modulation wave and the additional bridge arm current which finally participate in M3C control are obtained.
45 Zero the q-axis current and the 0-sequence current of the matrix in the result obtained in step 44), resulting in an additional balance current of:
fig. 6 is a simulation result diagram of the present invention, and as shown in fig. 6, the present invention can realize the capacitor voltage balance control of the M3C module.
Claims (8)
1. A modular capacitor voltage balance control method of a modular multilevel matrix converter, wherein the modular multilevel matrix converter comprises 9 bridge arms, and the modular multilevel matrix converter is characterized by comprising the following steps:
1) Subtracting the average capacitance voltage of nine bridge arms from the capacitance voltage of a single bridge arm, and obtaining the equivalent direct current circulating current of the bridge arm by the obtained difference value through proportional integral control and quasi-proportional resonance control;
2) Multiplying the equivalent direct current circulation by 1 or-1 according to the current direction of the bridge arms to obtain additional balanced voltage, and carrying out normalization and amplitude limiting processing on the additional balanced voltage to obtain additional modulation waves of each bridge arm;
3) In voltage-sharing control of the additional balanced voltage of the modular multilevel matrix converter, performing step 1) and step 2) on four bridge arms, and obtaining modulation waves of the rest four bridge arms by a first constraint condition;
4) In voltage-sharing control of the additional balance current of the modular multi-level matrix converter, executing step 1) on four bridge arms in the modular multi-level matrix converter, dividing equivalent direct current circulating currents of the four bridge arms by modulated waves of the four bridge arms to obtain circulating currents of the four bridge arms, obtaining circulating currents of the other four bridge arms by a second constraint condition, and obtaining the additional balance current after Clark conversion and Park conversion are carried out on the circulating currents of all the bridge arms in the modular multi-level matrix converter;
5) Adding the additional balance current with d-axis currents of a power frequency side and a frequency division side respectively, and obtaining a modulation wave of input and output control through a current inner ring; adding the additional modulation wave of the bridge arm and the modulation wave of the input and output control to obtain a final modulation wave signal of the modular multilevel matrix converter;
6) And carrying out module capacitor voltage balance control on the modular multi-level matrix converter according to the final modulation wave signal of the modular multi-level matrix converter.
2. The method for controlling the voltage balance of the modular capacitor of the modular multilevel matrix converter according to claim 1, wherein the specific operation of step 6) is as follows: and acquiring a triangular carrier signal of the modular multi-level matrix converter, performing difference on the final modulation wave signal and the triangular carrier signal, and acquiring a PWM signal of an actual switch in each full-bridge module in a bridge arm according to a difference result, wherein the PWM signal controls the state of the actual switch of each full-bridge module in each bridge arm, so that the module capacitance voltage balance control of the modular multi-level matrix converter is realized.
3. The method for controlling the voltage balance of the modular capacitor of the modular multilevel matrix converter according to claim 1, wherein the specific operation process of step 1) is as follows:
11 Let the capacitor voltage of the bridge arm be V xy_dc (x is belonged to { u, v, w }, y is belonged to { a, b, c }), and the average capacitance voltage of the nine bridge arms is
Wherein the content of the first and second substances,
bridge arm current of i xy (x∈{u,v,w},y∈{a,b,c})；
12 Average capacitance voltage of nine bridge arms
Voltage V of capacitor connected with single bridge arm xy_dc Subtracting, and obtaining a first part of equivalent direct current circulation i after the obtained difference value passes through a proportional-integral controller xy_dc_cir1 (x belongs to { u, v, w }, y belongs to { a, b, c }), and the obtained difference value is processed by a quasi-proportional resonant controller to obtain the equivalent direct current circulating current i of the second part xy_dc_cir2 (x is epsilon { u, v, w }, y is epsilon { a, b, c }), and the first part is equivalent to a direct current circulation current i xy_dc_cir1 (x e { u, v, w }, y e { a, b, c }) and the second part equivalent direct current circulation i xy_dc_cir2 (x is belonged to { u, v, w }, y is belonged to { a, b, c }) are added to obtain the final equivalent direct current circulating current i of each bridge arm xy_dc_cir (x∈{u,v,w},y∈{a,b,c})。
4. The method for controlling the voltage balance of the modular capacitor of the modular multilevel matrix converter according to claim 3, wherein the specific process of the step 2) is as follows:
21 Set the additional balancing voltage to:
22 Normalizing the additional balancing voltage to limit the amplitude to [ -0.1,0.1]In between, obtain an additional modulated wave m xy_cir Comprises the following steps:
5. the method for controlling the voltage balance of the modular capacitor of the modular multilevel matrix converter according to claim 4, wherein the specific process of the step 3) is as follows:
31 In voltage-sharing control of each additional balanced voltage, 4 signals are selected from 9 additional modulation waves obtained in the step 22), the rest 4 signals are obtained under a first constraint condition, voltage-sharing control is carried out twice in total, modulation waves of different bridge arms are selected, and the two modulation waves are added to obtain a final additional modulation wave;
wherein the first constraint condition is:
6. the method for controlling the module capacitor voltage balance of the modular multilevel matrix converter according to claim 5, wherein the specific process of step 4) is as follows:
41 Set bridge arm circulation i xy-cir Comprises the following steps:
wherein, 1/m is xy The amplitude limit is [ -1,1]；
42 In voltage-sharing control of each additional balance current, 4 signals are selected from 9 circulating currents obtained in the step 41), the other 4 signals are obtained under a second constraint condition, circulating currents of different bridge arms are selected, and the two circulating currents are added to obtain a final circulating current;
the second constraint condition is as follows:
43 Coordinate transformation matrix C from a three-phase stationary frame to a two-phase stationary frame abc/αβ0 And a coordinate transformation matrix C for inversely transforming the two-phase static coordinate system into the three-phase static coordinate system αβ0/abc Circulating current i obtained in step 42) xy_cir (x is belonged to { u, v, w }, y is belonged to { a, b, c }) to carry out alpha beta 0 transformation;
44 A transformation matrix C from a two-phase stationary coordinate system to a dq0 coordinate system αβ0/dq0_s And C αβ0/dq0_l Performing Park conversion on the result obtained in the step 43);
45 Zero the q-axis current and the 0-sequence current of the matrix in the result obtained in step 44), resulting in an additional balance current of:
7. the method for controlling the module capacitor voltage balance of the modular multilevel matrix converter according to claim 6, wherein the specific process of step 43) is as follows:
coordinate transformation matrix C from three-phase static coordinate system to two-phase static coordinate system abc/αβ0 And a coordinate transformation matrix C for inversely transforming the two-phase static coordinate system into the three-phase static coordinate system αβ0/abc The ring obtained in step 42)Stream i xy_cir (x e { u, v, w }, y e { a, b, c }) to perform an α β 0 transformation, wherein,
8. the method for controlling the voltage balance of the modular capacitor of the modular multilevel matrix converter according to claim 7, wherein the specific process of step 44) is as follows:
transformation matrix C from two-phase stationary coordinate system to dq0 coordinate system αβ0/dq0_s And C αβ0/dq0_l Performing Park transformation on the result obtained in step 43), wherein,
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111293894A (en) * | 2020-03-09 | 2020-06-16 | 南京师范大学 | Capacitor voltage balance control method for modular multilevel matrix converter |
| CN114123805A (en) * | 2021-11-23 | 2022-03-01 | 西安交通大学 | Capacitor dynamic voltage-sharing control method of modular multilevel matrix converter |
| WO2022161095A1 (en) * | 2021-01-27 | 2022-08-04 | 中国长江三峡集团有限公司 | Mmc half-bridge sub-module capacitor voltage ripple multi-scale suppression method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111293894A (en) * | 2020-03-09 | 2020-06-16 | 南京师范大学 | Capacitor voltage balance control method for modular multilevel matrix converter |
| WO2022161095A1 (en) * | 2021-01-27 | 2022-08-04 | 中国长江三峡集团有限公司 | Mmc half-bridge sub-module capacitor voltage ripple multi-scale suppression method |
| CN114123805A (en) * | 2021-11-23 | 2022-03-01 | 西安交通大学 | Capacitor dynamic voltage-sharing control method of modular multilevel matrix converter |
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