CN112421982A - MMC module control pulse modulation method, device, equipment and medium - Google Patents

MMC module control pulse modulation method, device, equipment and medium Download PDF

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Publication number
CN112421982A
CN112421982A CN202011268571.5A CN202011268571A CN112421982A CN 112421982 A CN112421982 A CN 112421982A CN 202011268571 A CN202011268571 A CN 202011268571A CN 112421982 A CN112421982 A CN 112421982A
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signal
modulation
control
pulse
mmc
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CN112421982B (en
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盛超
骆潘钿
钟连宏
段新辉
赵兵
王伟
张健
肖磊石
王红星
朱良合
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Electric Power Research Institute of Guangdong Power Grid Co Ltd
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Electric Power Research Institute of Guangdong Power Grid Co Ltd
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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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/539—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
    • H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
    • 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
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a method, a device, equipment and a medium for controlling pulse modulation by an MMC module, which are used for decomposing a signal to be modulated, and carrying out carrier phase-shifting sinusoidal pulse width modulation on a first signal component or a third signal component obtained by decomposition to obtain a first modulation signal; carrying out minimum level approximation modulation on the second signal component or the fourth signal component to obtain a second modulation signal; determining a control sequence of the MMC sub-modules according to a pulse control signal obtained by superposing the first modulation signal and the second modulation signal; control pulses of the MMC sub-modules are generated and output according to the control sequence and the pulse control signals, so that the problems that the NLC can form good waveforms in the occasions with a large number of control modules, the harmonic waves are large in the occasions with a low number of modules, and the waveform quality is poor are solved; SVPWM can eliminate the harmonic when low MMC submodule control quantity, forms good wave form, but in the multimode number occasion, its calculation control degree of difficulty is too big, technical problem difficult to realize.

Description

MMC module control pulse modulation method, device, equipment and medium
Technical Field
The invention relates to the technical field of power electronics, in particular to a method, a device, equipment and a medium for modulating control pulses of an MMC module.
Background
With the rapid development of power electronic technology, a Modular Multilevel Converter (MMC) has shown its main engineering application prospect as a novel topology structure of the Multilevel Converter. Compared with a traditional two-level or three-level voltage source converter, the MMC has no direct-current energy storage capacitor between the positive electrode and the negative electrode of the direct-current side, the converter can output a voltage waveform with good waveform quality in alternating-current measurement by controlling the switching states of all sub-modules, and the direct-current voltage is kept dynamically stable on the direct-current side. The converter has the advantages of flexible voltage level control, low harmonic content, low switching loss, small filter capacity and the like, improves the efficiency and economy of the converter, and is widely applied and researched in the fields of high-voltage direct-current transmission and high-voltage electric energy change.
However, the number of submodules of the MMC is large, the control quantity is large, and the control process is complex, so the modulation mode of the MMC is a key point for realizing the variable performance of the MMC. The existing MMC modulation strategies can be divided into high-frequency modulation and fundamental frequency modulation according to the switching frequency. The high-frequency modulation refers to that each switching device is switched for multiple times in one power frequency period of output voltage, mainly comprises carrier phase shift pulse width modulation (CPS-SPWM) and carrier stacking pulse width modulation (LS-SPWM), and is an application of a corresponding modulation method in a three-level voltage source converter in a multi-level converter. The fundamental frequency modulation means that in a power frequency period, each switching device is switched on and off only once or twice theoretically to generate output voltage of step waves. Typical of such modulation methods are space vector modulation (SVPWM) and nearest level approximation modulation (NLC).
By applying the MMC multilevel converter module, ideal high-quality alternating voltage waveform can be converted at a current conversion side, and the alternating voltage waveform is used for simulating various working conditions of a power system, such as high-voltage faults, low-voltage faults, power grid voltage fluctuation, frequency fluctuation and simulated power grid fault voltage waveform to test the performance of other power equipment. In the test application occasion with higher application level number and larger control alternating voltage change range, NLC and SVPWM do not meet the requirements, for example, a current converter with a 20-level MMC structure is used for simulating high-low voltage ride-through faults of a power grid, the voltage change range is 20-130%, and the number of MMC sub-modules is controlled within the range of 3-20. The NLC can form a good waveform on the occasion with more control modules, has large harmonic wave on the occasion with lower modules and has poor waveform quality; SVPWM can eliminate the harmonic when low MMC submodule control quantity, forms good wave form, but in the multimode number occasion, its calculation control degree of difficulty is too big, is difficult to realize.
Therefore, a method for controlling pulse modulation by an MMC module is provided, so that a voltage waveform can be accurately controlled by a multi-MMC sub-module structure in a large voltage change range, harmonic waves are reduced, a relatively ideal control effect is achieved, and the problem to be solved at present is urgently needed.
Disclosure of Invention
The invention provides a method, a device, equipment and a medium for modulating control pulses of an MMC (multilevel converter) module, which are used for solving the problems that an NLC (non-linear logic) can form a good waveform on occasions with a large number of control modules, the harmonic wave is large on occasions with a low number of modules, and the waveform quality is poor; SVPWM can eliminate the harmonic when low MMC submodule control quantity, forms good wave form, but in the multimode number occasion, its calculation control degree of difficulty is too big, technical problem difficult to realize.
In view of the above, a first aspect of the present invention provides a method for controlling pulse modulation by an MMC module, including:
judging the input signal S to be modulatediWhether or not it is less than a target value n0If yes, decomposing the signal to be modulated into a first signal component SiAnd a second signal component 0, if not, the signal to be modulated is decomposed into a third signal component n0And a fourth signal component Si-n0Wherein the target value n0Determining the range of the level number calculated by a carrier phase-shifting sine pulse width modulation controller and the total number of the MMC sub-modules;
carrying out carrier phase shift sinusoidal pulse width modulation on the first signal component or the third signal component to obtain a first modulation signal;
multiplying the second signal component or the fourth signal component by the total number of the MMC sub-modules to obtain a modulation wave, and enabling the nearest level to instantaneously approach the modulation wave to obtain a second modulation signal;
superposing the first modulation signal and the second modulation signal to obtain a pulse control signal;
determining a control sequence of the MMC sub-modules based on the pulse control signals;
and generating and outputting the control pulse of the MMC sub-module according to the control sequence and the pulse control signal.
Optionally, the determining the control sequence of the MMC sub-modules based on the pulse control signal includes:
and determining the control sequence of the MMC sub-modules by presetting an MMC voltage sorting algorithm according to the voltage amplitude of the pulse control signal.
Optionally, the generating and outputting the control pulse of the MMC sub-module according to the control sequence and the pulse control signal includes:
receiving a preset bridge arm current signal and a preset locking signal;
generating a control pulse of the MMC sub-module by adopting the preset bridge arm current signal, the preset locking signal and the pulse control signal;
and outputting the control pulse to the corresponding MMC sub-modules according to the control sequence.
Optionally, the performing carrier phase shift sinusoidal pulse width modulation on the first signal component or the third signal component to obtain a first modulation signal includes:
and carrying out carrier phase shift sinusoidal pulse width modulation on the first signal component or the third signal component according to the generated triangular carrier space vector signal to obtain a first modulation signal.
The present invention provides in a second aspect an MMC module control pulse modulation apparatus, comprising:
a signal decomposition module for judging the input signal S to be modulatediWhether or not it is less than a target value n0If yes, decomposing the signal to be modulated into a first signal component SiAnd a second signal component 0, if not, the signal to be modulated is decomposed into a third signal component n0And a fourth signal component Si-n0Wherein the target value n0Determining the range of the level number calculated by a carrier phase-shifting sine pulse width modulation controller and the total number of the MMC sub-modules;
the carrier phase-shifting sinusoidal pulse width modulation module is used for carrying out carrier phase-shifting sinusoidal pulse width modulation on the first signal component or the third signal component to obtain a first modulation signal;
the lowest level approximation modulation module is used for multiplying the second signal component or the fourth signal component by the total number of the MMC sub-modules to obtain a modulation wave, so that the nearest level instantaneously approximates the modulation wave to obtain a second modulation signal;
the signal superposition module is used for superposing the first modulation signal and the second modulation signal to obtain a pulse control signal;
the sequence determination module is used for determining the control sequence of the MMC sub-modules based on the pulse control signals;
and the control pulse generation module is used for generating and outputting the control pulse of the MMC sub-module according to the control sequence and the pulse control signal.
A third aspect of the invention provides an MMC module-controlled pulse modulation device, said device comprising a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute any of the MMC module control pulse modulation methods of the first aspect according to instructions in the program code.
A fourth aspect of the present invention provides a computer readable storage medium for storing program code for executing the MMC module control pulse modulation method of any one of the first aspects.
According to the technical scheme, the invention has the following advantages:
the invention provides a control pulse modulation method of an MMC module, which comprises the following steps: judging the input signal S to be modulatediWhether or not it is less than a target value n0If yes, the signal to be modulated is decomposed into a first signal component SiAnd a second signal component 0, if not, the signal to be modulated is decomposed into a third signal component n0And a fourth signal component Si-n0Wherein the target value n0Determining the range of the level number calculated by a carrier phase-shifting sine pulse width modulation controller and the total number of MMC sub-modules; carrying out carrier phase shift sine pulse width modulation on the first signal component or the third signal component to obtain a first modulation signal; multiplying the second signal component or the fourth signal component by the total number of the MMC sub-modules to obtain a modulation wave, and enabling the nearest level to instantaneously approach the modulation wave to obtain a second modulation signal; superposing the first modulation signal and the second modulation signal to obtain a pulse control signal; determining a control sequence of the MMC sub-modules based on the pulse control signals; and generating and outputting the control pulse of the MMC sub-module according to the control sequence and the pulse control signal.
According to the invention, a signal decomposition and superposition method is adopted, during normal voltage control or high voltage control, an NLC and SVPWM superposition control mode is adopted, during low voltage control, an SVPWM control mode is adopted, harmonic waves are eliminated, a good traveling wave is formed, the advantages of NLC and SVPWM are integrated, the defects of two modulation modes are avoided, voltage waveforms can be accurately controlled in a large voltage change range under the multi-MMC sub-module structure, the harmonic waves are reduced, and therefore, the problems that NLC can form good waveforms under the condition of a large number of control modules, the harmonic waves are large under the condition of a low number of modules, and the waveform quality is poor are solved; SVPWM can eliminate the harmonic when low MMC submodule control quantity, forms good wave form, but in the multimode number occasion, its calculation control degree of difficulty is too big, technical problem difficult to realize.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic flowchart of a method for controlling pulse modulation by an MMC module according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a decomposition process of a signal to be modulated according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an MMC module control pulse modulation apparatus according to an embodiment of the present invention.
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, and not all of the embodiments. 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.
The minimum Level approximation (NLC) modulation method in the prior art has the following advantages and disadvantages:
the recent level approximation modulation is also called as a quantization rounding method, the principle of the method is that the recent level instantaneous approximation modulation wave is used, the principle is simple, the realization is easy, and the method is suitable for occasions with high MMC levels. The method is the most practical MMC modulation method at present, and has been practically applied in a plurality of projects. From the aspect of output voltage waveform, the recent level approximation modulation is similar to step wave modulation, the modulation method is simple in principle, easy to implement and high in efficiency, but when the number of levels of a current converter is small, approximation errors are relatively large, low-order harmonics also appear, and in an application occasion with high number of levels, the modulation method has advantages due to the fact that the principle is simple.
The Space Vector pulse width modulation algorithm (Space Vector PWM, SVPWM) has the advantages and disadvantages that:
the space vector pulse width modulation algorithm is based on PWM modulation, and proper switching states and switching moments are selected according to the positions of three-phase voltage space vectors on a space vector diagram. The SVPWM modulation method can greatly reduce the switching frequency, eliminate or reduce the common-mode voltage, is beneficial to the balance of capacitance and voltage and small in waveform distortion, and can be suitable for a multi-phase system or a three-phase unbalanced system.
Since the number of the space vectors is the third power of the level number of the MMC, when the level number is high, the redundancy of the space vectors corresponding to each state is high, and how to locate and select a proper space vector in a very short time is very difficult, or even impossible. Therefore, the modulation algorithm is not suitable for occasions with high MMC level numbers.
By applying the MMC multilevel converter module, ideal high-quality alternating voltage waveform can be converted at a current conversion side, and the alternating voltage waveform is used for simulating various working conditions of a power system, such as high-voltage faults, low-voltage faults, power grid voltage fluctuation, frequency fluctuation and simulated power grid fault voltage waveform to test the performance of other power equipment. In the test application occasion with higher application level number and larger control alternating voltage change range, NLC and SVPWM do not meet the requirements, for example, a current converter with a 20-level MMC structure is used for simulating high-low voltage ride-through faults of a power grid, the voltage change range is 20-130%, and the number of MMC sub-modules is controlled within the range of 3-20. The NLC can form a good waveform on the occasion with more control modules, has large harmonic wave on the occasion with lower modules and has poor waveform quality; SVPWM can eliminate the harmonic when low MMC submodule control quantity, forms good wave form, but in the multimode number occasion, its calculation control degree of difficulty is too big, is difficult to realize.
In order to solve the above problems, the present invention provides a control pulse modulation method suitable for an MMC module.
For easy understanding, referring to fig. 1, an embodiment of a method for controlling pulse modulation by an MMC module according to the present invention includes:
step 101, judging an input signal S to be modulatediWhether or not it is less than a target value n0If yes, the signal to be modulated is decomposed into a first signal component SiAnd a second signal component 0, if not, the signal to be modulated is decomposed into a third signal component n0And a fourth signal component Si-n0。
Real-time monitoring of a signal S to be modulatediSignal S to be modulatediIs in the range of 0-1, and the input signal S to be modulated is input according to different practical conditionsiAlso differently, in general, the signal S to be modulatediIs a sinusoidal signal.
Signal S to be modulatediReferring to fig. 2, the signal decomposition process of (a) may determine the input signal S to be modulatediWhether or not it is less than a target value n0Wherein the target value n0The range of the level number N calculated by the carrier phase-shift sine pulse width modulation controller and the total number M of the MMC sub-modules are determined, specifically N0The carrier phase-shifting sine pulse width modulation controller has high performance and can calculate more level ranges. For example, the carrier phase-shift sine pulse width modulation controller has high performance, the range of the number of levels which can be calculated is 7, the total number of MMC sub-modules is 20, and then the target value n is07/20 ═ 0.35; when the performance of the carrier phase-shifting sine pulse width modulation controller is low and the range of the calculated level number is 3, the target value n03/20 ═ 0.15.
When the input is judged to be waitedModulated signal SiLess than a target value n0The signal to be modulated is then decomposed into a first signal component SiAnd a second signal component 0 when the input signal S to be modulated is judgediNot less than a target value n0The signal to be modulated is then decomposed into a third signal component n0And a fourth signal component Si-n0。
And 102, carrying out carrier phase shift sinusoidal pulse width modulation on the first signal component or the third signal component to obtain a first modulation signal.
Specifically, the first signal component or the third signal component is subjected to carrier phase shift sinusoidal pulse width modulation according to the generated triangular carrier space vector signal to obtain a first modulation signal, wherein the phase-shifted triangular carrier space vector signal is generated by a triangular carrier module. The switch is controlled by a triangular carrier as a linear time reference.
And 103, multiplying the second signal component or the fourth signal component by the total number of the MMC sub-modules to obtain a modulation wave, and enabling the nearest level to instantaneously approach the modulation wave to obtain a second modulation signal.
Step 102 and step 103 may be performed simultaneously or sequentially, and are not specifically limited herein.
And step 104, superposing the first modulation signal and the second modulation signal to obtain a pulse control signal.
And adding the first modulation signal and the second modulation signal to obtain a pulse control signal.
And step 105, determining the control sequence of the MMC sub-modules based on the pulse control signals.
The voltage amplitude of the pulse control signal can be continuously detected, and the control sequence of the MMC sub-modules is determined by presetting an MMC voltage sorting algorithm according to the voltage amplitude of the pulse control signal.
For example, when the bridge arm current is greater than or equal to zero, the capacitance and voltage are arranged in an ascending order, a reference voltage U1 is given, whether the capacitance and voltage of the input MMC sub-module exceeds the reference voltage U1 or not is detected, and if yes, the MMC sub-module is cut off; when the bridge arm current is less than zero, the capacitor voltage is arranged in a descending order, another reference voltage U2 is given, whether the capacitor voltage which is already put into the MMC sub-module is less than the reference voltage U2 or not is detected, if the capacitor voltage is less than the reference voltage U2, the MMC sub-module is cut off, and if the capacitor voltage is not less than the reference voltage U3578, the putting state is kept continuously.
And 106, generating and outputting a control pulse of the MMC sub-module according to the control sequence and the pulse control signal.
Specifically, a preset bridge arm current signal and a preset locking signal are received; generating a control pulse of the MMC sub-module by adopting a preset bridge arm current signal, a preset locking signal and a pulse control signal; and outputting the control pulse to the corresponding MMC sub-modules according to the control sequence. Receiving a preset bridge arm current signal and a preset locking signal, providing control current for opening and closing a plurality of MMC sub-modules, generating control pulses of the plurality of MMC sub-modules by adopting a threshold bridge arm current signal and the preset locking signal and combining the level condition of the obtained pulse control signal so as to inform the voltage waveforms needing to be output by the plurality of MMC sub-modules, outputting the control pulses to the corresponding MMC sub-modules according to the obtained control sequence, and driving the plurality of MMC sub-modules to generate the voltage waveforms with required high quality. Wherein, control pulse is used for controlling the switch of MMC submodule piece switch pipe, if half-bridge submodule piece, control pulse includes time domain MMC submodule piece upper and lower switch tube control module, if full-bridge submodule piece, control pulse then includes four switch tube control pulse of all MMC submodule pieces.
In the embodiment of the invention, a signal decomposition and superposition method is adopted, when in normal voltage control or high voltage control, a plurality of MMC sub-modules are controlled, a NLC and SVPWM superposition control mode is adopted, when in low voltage control, a plurality of MMC sub-modules are controlled, a SVPWM control mode is adopted to eliminate harmonic waves and form good traveling waves, the advantages of NLC and SVPWM are integrated, meanwhile, the determination of two modulation modes is avoided, voltage waveforms can be accurately controlled in a large voltage change range under the structure of the plurality of MMC sub-modules, harmonic waves are reduced, and therefore, the problem that NLC can form good waveforms when the number of control modules is large is solved, the harmonic waves are large when the number of modules is low, and the waveform quality is poor is solved; SVPWM can eliminate the harmonic when low MMC submodule control quantity, forms good wave form, but in the multimode number occasion, its calculation control degree of difficulty is too big, technical problem difficult to realize.
The present invention provides a method for controlling pulse modulation by an MMC module, and the following is a device for controlling pulse modulation by an MMC module provided by the present invention.
For easy understanding, referring to fig. 3, an embodiment of an MMC module control pulse modulation apparatus according to the present invention includes:
a signal decomposition module 201 for determining the input signal S to be modulatediWhether or not it is less than a target value n0If yes, the signal to be modulated is decomposed into a first signal component SiAnd a second signal component 0, if not, the signal to be modulated is decomposed into a third signal component n0And a fourth signal component Si-n0Wherein the target value n0Determining the range of the level number calculated by a carrier phase-shifting sine pulse width modulation controller and the total number of MMC sub-modules;
a carrier phase-shift sinusoidal pulse width modulation module 202, configured to perform carrier phase-shift sinusoidal pulse width modulation on the first signal component or the third signal component to obtain a first modulation signal;
the lowest level approximation modulation module 203 is configured to multiply the second signal component or the fourth signal component by the total number of the MMC submodules to obtain a modulation wave, so that the nearest level instantaneously approximates the modulation wave to obtain a second modulation signal;
the signal superposition module 204 is configured to superpose the first modulation signal and the second modulation signal to obtain a pulse control signal;
an order determination module 205 for determining a control order of the MMC sub-modules based on the pulse control signal;
and the control pulse generation module 206 is used for generating and outputting the control pulse of the MMC sub-module according to the control sequence and the pulse control signal.
As a further improvement, the order determination module 205 is specifically configured to:
and determining the control sequence of the MMC sub-modules by presetting an MMC voltage sorting algorithm according to the voltage amplitude of the pulse control signal.
As a further improvement, the control pulse generating module 206 is specifically configured to:
receiving a preset bridge arm current signal and a preset locking signal;
generating a control pulse of the MMC sub-module by adopting a preset bridge arm current signal, a preset locking signal and a pulse control signal;
and outputting the control pulse to the corresponding MMC sub-modules according to the control sequence.
As a further improvement, the apparatus further comprises:
a triangular carrier module 207 for generating phase-shifted triangular carrier space vector signals;
correspondingly, the carrier phase-shift sine pulse width modulation module 202 is specifically configured to:
and carrying out carrier phase shift sinusoidal pulse width modulation on the first signal component or the third signal component according to the triangular carrier space vector signal to obtain a first modulation signal.
The embodiment of the invention also provides MMC module control pulse modulation equipment, which comprises a processor and a memory:
the memory is used for storing the program codes and transmitting the program codes to the processor;
the processor is configured to execute the MMC module control pulse modulation method in the aforementioned embodiment of the MMC module control pulse modulation method according to instructions in the program code.
An embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium is used to store a program code, and the program code is used to execute the MMC module control pulse modulation method in the aforementioned MMC module control pulse modulation method embodiment.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for executing all or part of the steps of the method according to the embodiments of the present invention through a computer device (which may be a personal computer, a server, or a network device). And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (7)

1. A MMC module control pulse modulation method is characterized by comprising the following steps:
judging the input signal S to be modulatediWhether or not it is less than a target value n0If yes, decomposing the signal to be modulated into a first signal component SiAnd a second signal component 0, if not, the signal to be modulated is decomposed into a third signal component n0And a fourth signal component Si-n0Wherein the target value n0Determining the range of the level number calculated by a carrier phase-shifting sine pulse width modulation controller and the total number of the MMC sub-modules;
carrying out carrier phase shift sinusoidal pulse width modulation on the first signal component or the third signal component to obtain a first modulation signal;
multiplying the second signal component or the fourth signal component by the total number of the MMC sub-modules to obtain a modulation wave, and enabling the nearest level to instantaneously approach the modulation wave to obtain a second modulation signal;
superposing the first modulation signal and the second modulation signal to obtain a pulse control signal;
determining a control sequence of the MMC sub-modules based on the pulse control signals;
and generating and outputting the control pulse of the MMC sub-module according to the control sequence and the pulse control signal.
2. The MMC module control pulse modulation method of claim 1, wherein the determining a control order of the MMC sub-modules based on the pulse control signal comprises:
and determining the control sequence of the MMC sub-modules by presetting an MMC voltage sorting algorithm according to the voltage amplitude of the pulse control signal.
3. The MMC module control pulse modulation method of claim 1, wherein generating and outputting the control pulse of the MMC sub-module according to the control sequence and the pulse control signal comprises:
receiving a preset bridge arm current signal and a preset locking signal;
generating a control pulse of the MMC sub-module by adopting the preset bridge arm current signal, the preset locking signal and the pulse control signal;
and outputting the control pulse to the corresponding MMC sub-modules according to the control sequence.
4. The MMC module-controlled pulse modulation method of claim 1, wherein the carrier phase-shifted sinusoidal pulse width modulation of the first signal component or the third signal component to obtain a first modulated signal comprises:
and carrying out carrier phase shift sinusoidal pulse width modulation on the first signal component or the third signal component according to the generated triangular carrier space vector signal to obtain a first modulation signal.
5. An MMC module control pulse modulation device, characterized by comprising:
a signal decomposition module for judging the input signal S to be modulatediWhether or not it is less than a target value n0If yes, decomposing the signal to be modulated into a first signal component SiAnd a second signal component 0, if not, the signal to be modulated is decomposed into a third signal component n0And a fourth signal component Si-n0Wherein the target value n0Determining the range of the level number calculated by a carrier phase-shifting sine pulse width modulation controller and the total number of the MMC sub-modules;
the carrier phase-shifting sinusoidal pulse width modulation module is used for carrying out carrier phase-shifting sinusoidal pulse width modulation on the first signal component or the third signal component to obtain a first modulation signal;
the lowest level approximation modulation module is used for multiplying the second signal component or the fourth signal component by the total number of the MMC sub-modules to obtain a modulation wave, so that the nearest level instantaneously approximates the modulation wave to obtain a second modulation signal;
the signal superposition module is used for superposing the first modulation signal and the second modulation signal to obtain a pulse control signal;
the sequence determination module is used for determining the control sequence of the MMC sub-modules based on the pulse control signals;
and the control pulse generation module is used for generating and outputting the control pulse of the MMC sub-module according to the control sequence and the pulse control signal.
6. An MMC module-controlled pulse modulation device, characterized in that the device comprises a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the MMC module control pulse modulation method of any one of claims 1-4 according to instructions in the program code.
7. A computer-readable storage medium, characterized in that the computer-readable storage medium is configured to store program code for performing the MMC module control pulse modulation method of any of claims 1-4.
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