CN115001238A - Current distortion suppression method, controller, rectification system and storage medium - Google Patents
Current distortion suppression method, controller, rectification system and storage medium Download PDFInfo
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- CN115001238A CN115001238A CN202210641641.XA CN202210641641A CN115001238A CN 115001238 A CN115001238 A CN 115001238A CN 202210641641 A CN202210641641 A CN 202210641641A CN 115001238 A CN115001238 A CN 115001238A
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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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
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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
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
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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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc 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
- H02M7/217—Conversion of ac power input into dc 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
- H02M7/2173—Conversion of ac power input into dc 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 in a biphase or polyphase circuit arrangement
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention provides a current distortion suppression method, a controller, a rectification system and a storage medium. The method is applied to a Vienna rectifier and comprises the following steps: monitoring a modulation voltage waveform of a target phase of the Vienna rectifier; the target phase is any one of three phases of the Vienna rectifier, and the modulation voltage waveform is used for controlling the input current of the target phase; performing voltage compensation on the modulation voltage waveform of the target phase in the zero-crossing interval so as to reduce the input current phase corresponding to the compensated zero-crossing interval compared with the input current phase before compensation; the zero-crossing interval is centered on a zero-crossing point of the standard modulation voltage waveform of the target phase. The current zero crossing distortion of the Vienna rectifier can be inhibited.
Description
Technical Field
The invention relates to the technical field of distortion control, in particular to a current distortion suppression method, a controller, a rectification system and a storage medium.
Background
The Vienna rectifier, as a widely used power converter, should meet important constraints during normal operation. When the rectifier operates under a non-ideal condition, the use of the traditional carrier modulation strategy can violate important limiting conditions, and when the current zero crossing point does not meet the important limiting conditions, the current waveform is distorted at the zero crossing point, so that the working performance of the Vienna rectifier is influenced.
Disclosure of Invention
The embodiment of the invention provides a current distortion suppression method, a controller, a rectification system and a storage medium, and aims to solve the problem that the current waveform of a Vienna rectifier is distorted at a zero-crossing point in the prior art.
In a first aspect, an embodiment of the present invention provides a current distortion suppression method, which is applied to a Vienna rectifier, and the method includes:
monitoring a modulation voltage waveform of a target phase of the Vienna rectifier; the target phase is any one of three phases of the Vienna rectifier, and the modulation voltage waveform is used for controlling the input current of the target phase;
performing voltage compensation on the modulation voltage waveform of the target phase in the zero-crossing interval so as to reduce the input current phase corresponding to the compensated zero-crossing interval compared with the input current phase before compensation; the zero-crossing interval is centered on a zero-crossing point of the standard modulation voltage waveform of the target phase.
In one possible implementation, the modulation voltage waveform of the target phase includes a positive modulation waveform greater than zero and a negative modulation waveform less than zero;
voltage compensation of a modulation voltage waveform of a target phase within a zero-crossing interval, comprising:
increasing a first preset voltage value to the voltage of the positive modulation waveform in the zero-crossing interval;
subtracting a second preset voltage value from the voltage of the negative modulation waveform in the zero-crossing interval;
the first preset voltage value and the second preset voltage value are both positive values, the input current of the target phase is reduced along with the increase of the first preset voltage value in the zero-crossing interval, and the input current of the target phase is reduced along with the increase of the second preset voltage value in the zero-crossing interval.
In a possible implementation, the first preset voltage value and the second preset voltage value are equal.
In one possible implementation, the target phase includes a Vienna rectifier first phase, a second phase, and a third phase;
increasing the voltage of the positive modulation waveform in the zero-crossing interval by a first preset voltage value, comprising:
increasing a first preset voltage value to the voltage of the positive modulation waveform of the first phase in the zero-crossing interval; increasing a first preset voltage value to the voltage of the positive modulation waveform of the second phase in the zero-crossing interval; increasing a first preset voltage value to the voltage of the positive modulation waveform of the third phase in the zero-crossing interval;
subtracting a second preset voltage value from the voltage of the negative modulation waveform in the zero-crossing interval, including:
subtracting a second preset voltage value from the voltage of the positive modulation waveform of the first phase in the zero-crossing interval; subtracting a second preset voltage value from the voltage of the positive modulation waveform of the second phase in the zero-crossing interval; subtracting a second preset voltage value from the voltage of the positive modulation waveform of the third phase in the zero-crossing interval;
and after voltage compensation is carried out on the modulation voltage waveform of the target phase in the zero-crossing interval, the switching tube corresponding to the target is controlled according to the compensated modulation voltage waveform of the target phase.
In one possible implementation, the method further includes:
monitoring the current output power of the Vienna rectifier;
determining the interval length of a zero-crossing interval according to the current output power;
and determining a zero-crossing interval according to the interval length and the zero-crossing point of the standard voltage waveform of the target phase.
In one possible implementation manner, determining the interval length of the zero-crossing interval according to the current output power includes:
under the current output power, determining the interval length of a zero-crossing interval according to the acquisition delay and the control delay; the acquisition delay is the delay for acquiring the parameters of the Vienna rectifier, and the control delay is the delay for controlling the action of the Vienna rectifier.
In one possible implementation manner, determining the interval length of the zero-crossing interval according to the current output power includes:
when the current output power is smaller than or equal to a first preset power value, determining the interval length as a first length;
when the current output power is greater than a first preset power value and less than or equal to a second preset power value, determining the interval length as a second length;
when the current output power is larger than a second preset power value, determining the interval length as a third length;
the first preset power value is smaller than or equal to the second preset power value; the second length is a decreasing function of the current output power, the upper limit of the value range of the second length is the first length, and the lower limit is the third length.
In a second aspect, an embodiment of the present invention provides a current distortion suppression apparatus, which is applied to a Vienna rectifier, and includes:
the first monitoring module is used for monitoring the modulation voltage waveform of a target phase of the Vienna rectifier; the target phase is any one of three phases of the Vienna rectifier;
the control module is used for performing voltage compensation on the modulation voltage waveform of the target phase in the zero-crossing interval so that the error between the voltage of the modulation voltage of the target phase at the zero-crossing point in the zero-crossing interval and zero is smaller than a preset threshold value; the zero-crossing interval is centered on a zero-crossing point of the standard modulation voltage waveform of the target phase.
In a third aspect, an embodiment of the present invention provides a controller, including a memory and a processor, where the memory stores a computer program operable on the processor, and the processor executes the computer program to implement the steps of the current distortion suppressing method according to the first aspect or any one of the possible implementations of the first aspect.
In a fourth aspect, an embodiment of the present invention provides a rectification system, including the controller according to the third aspect and the Vienna rectifier; the Vienna rectifier is controlled by a controller.
In a fifth aspect, an embodiment of the present invention provides a computer-readable storage medium, where a computer program is stored, and the computer program, when executed by a processor, implements the steps of the current distortion suppression method according to the first aspect or any one of the possible implementations of the first aspect.
The embodiment of the invention provides a current distortion suppression method, a controller, a rectification system and a storage medium, wherein the modulation voltage waveform of a target phase in a zero-crossing interval is subjected to voltage compensation by monitoring the modulation voltage waveform of the target phase of a Vienna rectifier so as to achieve the purpose of suppressing the current distortion of the target phase at the zero-crossing point, the control mode is simple and convenient, and the working reliability of the Vienna rectifier can be improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions 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 it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a Vienna rectifier current waveform diagram provided by an embodiment of the invention;
fig. 2 is a schematic circuit diagram of a Vienna rectifier according to an embodiment of the present invention;
FIG. 3 is a phase relationship diagram of a non-ideal Vienna rectifier provided by an embodiment of the present invention;
FIG. 4 is a flow chart of an implementation of a current distortion suppression method provided by an embodiment of the present invention;
FIG. 5 is a three-phase voltage waveform diagram of a Vienna rectifier provided by an embodiment of the invention;
FIG. 6 is a graph of the modulation voltage waveform of a Vienna rectifier prior to compensation provided by an embodiment of the invention;
FIG. 7 is a graph of the modulation voltage waveform of a compensated Vienna rectifier provided by an embodiment of the present invention;
FIG. 8 is a waveform of a compensated Vienna rectifier current provided by an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a current distortion suppression device provided in an embodiment of the present invention;
fig. 10 is a schematic diagram of a controller provided in an embodiment of the invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following description is made by way of specific embodiments with reference to the accompanying drawings.
Referring to fig. 1, a waveform diagram of a Vienna rectifier current provided by an embodiment of the invention is shown. As shown in the figure, the inventor finds that, after a boost inductor and a MOS transistor are replaced on a PFC (Power Factor Correction) side of a 15K buck Power supply module, an input current harmonic wave is increased and exceeds an index requirement. Under half-load, the harmonic wave sizes are 4.6%, 4.5% and 5.05%, and obviously exceed the index requirements. As can be seen from fig. 1, the current distortion is significant, especially at the zero crossings of the input voltage.
The Vienna rectifier needs to meet Important limiting conditions (IR) for normal operation: the polarity of the input port voltage of each phase of the Vienna rectifier must be consistent with the polarity of the current of each corresponding phase network side. This is determined by the circuit structure of the Vienna rectifier itself, as shown in fig. 2, it is easy to analyze the circuit topology, the value of the input port voltage is determined by the polarity of the input current and the switch state, and the polarity of the input port voltage is consistent with the polarity of the input current.
The Vienna rectifier should meet important constraints during normal operation. But when rectifiers operate in non-ideal conditions, the use of conventional carrier modulation strategies can violate important constraints. As shown in fig. 3, a phase relationship diagram of a non-ideal Vienna rectifier provided by an embodiment of the invention is shown. For a three-phase Vienna rectifier, the influence of offset voltage in the modulation wave on line voltage is counteracted, and therefore only sinusoidal reference voltage is considered. In fig. 3, the phase angle of the input current (ik) can be made to track the phase angle of the grid voltage (vk) by dq control, but the sinusoidal modulation voltage waveform lags the input current waveform by the phase angle difference θ z. Therefore, the current zero-crossing point does not satisfy the important limiting condition, the current waveform is distorted at the zero-crossing point, and when the internal resistance of the inductor is increased or the amplitude of the input current is increased, the phase angle difference theta z is increased.
In order to solve the problem of distortion of the zero crossing point of the Vienna rectifier current, an embodiment of the present invention provides a current distortion suppression method, and refer to fig. 4, which shows an implementation flowchart of the current distortion suppression method provided in the embodiment of the present invention. As shown in fig. 4, a current distortion suppression method applied to a Vienna rectifier may include:
s101, monitoring a modulation voltage waveform of a target phase of the Vienna rectifier; the target phase is any one of three phases of the Vienna rectifier, and the modulation voltage waveform is used for controlling the input current of the target phase.
Optionally, the three phases of the Vienna rectifier include a first phase, a second phase, and a third phase. Each phase corresponds to a group of switch tubes. The modulated voltage waveform is a sine wave with the abscissa representing time or period and the ordinate representing voltage. The modulation voltage waveform of the target phase is used for controlling a switching tube of the target phase, and further controlling the current waveform of the target phase. The modulated voltage waveform for each phase can be obtained by the PFC control loop of the Vienna rectifier.
Illustratively, referring to fig. 2, the modulation voltage waveform of the first phase a is used for controlling switching tubes Sa1 and Sa2, the modulation voltage waveform of the second phase b is used for controlling switching tubes Sb1 and Sb2, and the modulation voltage waveform of the third phase c is used for controlling switching tubes Sc1 and Sc 2.
S102, performing voltage compensation on the modulation voltage waveform of the target phase in the zero-crossing interval so as to reduce the input current phase corresponding to the compensated zero-crossing interval compared with the input current phase before compensation; the zero-crossing interval is centered on a zero-crossing point of the standard modulation voltage waveform of the target phase.
Optionally, the modulation voltage waveform of the target phase not in the zero-crossing interval is not compensated, and the switching tube corresponding to the target is controlled according to the compensated modulation voltage waveform of the target phase, so that the current waveform of the target phase finally meets the requirement of the relevant parameters of the zero-crossing point.
Optionally, the standard modulation voltage waveform is a standard sine wave, and for the standard sine wave, in one period, it may include three zero-crossing points of 0, pi and 2 pi, at which the voltage value of the standard modulation voltage waveform is zero. The zero-crossing region is a neighborhood centered on the zero-crossing point, that is, a region including a width of a portion of the width around the zero-crossing point.
In general, the modulation voltage waveform of the target phase may lag behind the voltage waveform of the target phase due to the boost inductance. The zero-crossing interval may also be the right neighborhood of the zero-crossing. However, considering that the acquisition and judgment processes of the hardware circuit require a certain time, the zero-crossing interval is generally a neighborhood taking the zero-crossing point as the center. The range and the interval length of the zero-crossing interval can be set according to actual needs.
The difference between each phase of the Vienna rectifier is 120 degrees, and the zero-crossing points of each phase are different in one power grid period, so that the zero-crossing intervals of each phase in the Vienna rectifier are the same in length, but different in positions, and correspond to different zero-crossing intervals.
For example, referring to fig. 5, a three-phase voltage waveform diagram of a Vienna rectifier provided by the embodiment of the invention is shown. As shown in fig. 5, in a grid cycle, six regions are divided, and zero-crossing positions of Ua, Ub, and Uc are different, and the present invention respectively compensates each phase to achieve the purpose of suppressing zero-crossing distortion.
Optionally, the uncompensated input current may have current distortion at a zero-crossing point, the distortion rate is high, and the voltage compensation is performed on the rated modulation voltage waveform of the target phase, so that the current value of the input current in the zero-crossing interval can be reduced, the distortion rate of the input current is further reduced, and the purpose of suppressing the current distortion in the zero-crossing interval is achieved.
The embodiment of the invention compensates the modulation voltage waveform of the target phase in the zero-crossing interval of the target phase so as to reduce the current distortion rate of the target phase at the zero-crossing point and achieve the purpose of inhibiting the current distortion of the target phase at the zero-crossing point.
In some embodiments of the invention, the modulation voltage waveform of the target phase comprises a positive modulation waveform greater than zero and a negative modulation waveform less than zero; the "performing voltage compensation on the modulation voltage waveform of the target phase in the zero-crossing interval" at S102 may include:
increasing a first preset voltage value to the voltage of the positive modulation waveform in the zero-crossing interval;
subtracting a second preset voltage value from the voltage of the negative modulation waveform in the zero-crossing interval;
the first preset voltage value and the second preset voltage value are both positive values, the input current of the target phase is reduced along with the increase of the first preset voltage value in the zero-crossing interval, and the input current of the target phase is reduced along with the increase of the second preset voltage value in the zero-crossing interval.
Optionally, the first preset voltage value and the second preset voltage value are obtained according to experimental setting and are both positive values. When the modulation voltage waveform of the target phase is not compensated, the current value of the positive current of the target phase at the zero-crossing point is generally larger than zero, and the current value of the negative current of the target phase at the zero-crossing point is generally smaller than zero.
Specifically, the first preset voltage value and the second preset voltage value may be the same or different, and may be specifically determined according to the compensation precision and the compensation complexity. When the first preset voltage value and the second preset voltage value are the same, the target phase compensation complexity can be reduced. When the first preset voltage value is different from the second preset voltage value, the compensation precision of the target phase can be improved. And a proper first preset voltage value and a proper second preset voltage value are selected through the compensation precision and the compensation complexity, so that the compatibility is higher, and the selection range is wider.
By increasing the first preset voltage value to the voltage of the positive modulation waveform of the target phase in the zero-crossing interval, the duty ratio of a switching tube corresponding to the target can be reduced, and further the current value of the target phase at the zero-crossing point tends to zero. By subtracting the second preset voltage value from the voltage of the negative modulation waveform of the target phase in the zero-crossing interval, the duty ratio of the switching tube corresponding to the target can be reduced, and the current value of the target phase at the zero-crossing point tends to zero. The positive distortion and the negative distortion of the current can be respectively reduced through positive compensation and negative compensation, the Vienna rectifier with different distortion rate requirements can be compensated in a targeted mode, the working reliability is considered, and meanwhile the design cost can be reduced according to the actual performance of the device.
For example, referring to fig. 6, a modulation voltage waveform diagram of a Vienna rectifier before compensation according to an embodiment of the present invention is shown. Referring to fig. 7, a graph of a modulation voltage waveform of a compensated Vienna rectifier provided by an embodiment of the present invention is shown. By comparing fig. 6 and fig. 7, the voltage of the modulation voltage waveform of the target phase before compensation at the zero-crossing point is different from zero, and the voltage of the modulation voltage waveform of the target phase after compensation at the zero-crossing point tends to zero, thereby effectively suppressing the current distortion of the target phase.
Optionally, the target phase comprises a Vienna rectifier first phase, a second phase and a third phase.
Increasing a first preset voltage value to the voltage of the positive modulation waveform in the zero-crossing interval may specifically include:
increasing a first preset voltage value to the voltage of the positive modulation waveform of the first phase in the zero-crossing interval; increasing a first preset voltage value to the voltage of the positive modulation waveform of the second phase in the zero-crossing interval; increasing a first preset voltage value to the voltage of the positive modulation waveform of the third phase in the zero-crossing interval;
subtracting a second preset voltage value from the voltage of the negative modulation waveform in the zero-crossing interval, which may specifically include:
subtracting a second preset voltage value from the voltage of the positive modulation waveform of the first phase in the zero-crossing interval; subtracting a second preset voltage value from the voltage of the positive modulation waveform of the second phase in the zero-crossing interval; and subtracting a second preset voltage value from the voltage of the positive modulation waveform of the third phase in the zero-crossing interval.
After voltage compensation is carried out on the modulation voltage waveform of the target phase in the zero-crossing interval, the switching tube corresponding to the target is controlled according to the compensated modulation voltage waveform of the target phase
The modulation voltage waveform of the first phase, the modulation voltage waveform of the second phase, and the modulation voltage waveform of the third phase may be voltage-compensated by using the first preset voltage value and the second preset voltage, respectively. It is also possible to select suitable compensation voltage values for the phases, respectively.
For example, in a Vienna rectifier which has low requirement on compensation accuracy, the modulation voltage waveforms of the phases can be compensated by using the same compensation voltage value. For the Vienna rectifier with high compensation precision requirement, appropriate compensation voltage values can be respectively selected according to the positive modulation waveform and the negative modulation waveform of each phase, and the current distortion rate of each phase at the zero-crossing point is reduced as much as possible. Referring to fig. 8, which shows a current waveform diagram of a compensated Vienna rectifier provided in an embodiment of the present invention, as shown in fig. 8, the harmonic size is optimized to be 2.52%, 2.59%, and 3.13%, which are approximately reduced by 2% compared to fig. 1, and meet the requirement of the related index.
In the invention, zero-crossing voltage compensation can be carried out on one phase, two phases or three phases in the Vienna rectifier, and the zero-crossing voltage compensation is specifically selected according to actual needs.
In some embodiments of the present invention, the length of the zero-crossing interval may be determined according to the power of the Vienna rectifier, which specifically includes:
monitoring the current output power of the Vienna rectifier;
determining the interval length of a zero-crossing interval according to the current output power;
and determining a zero-crossing interval according to the interval length and the zero-crossing point of the standard voltage waveform of the target phase.
For the Vienna rectifier, the larger the output power is, the smaller the current distortion influences the Vienna rectifier, and the smaller the interval length of the zero-crossing interval can be. The pulse blocking duration of the switching tube can be reduced while the current distortion is restrained, and the working efficiency of the Vienna rectifier is improved.
Optionally, the relationship between the current output power and the interval length may be set through an actually measured optimal harmonic result.
Optionally, the determining the length of the zero-crossing interval according to the current output power in this embodiment includes the following two ways:
the first method comprises the following steps: under the current output power, determining the interval length of a zero-crossing interval according to the acquisition delay and the control delay; the acquisition delay is the delay for acquiring parameters of the Vienna rectifier, and the control delay is the delay for controlling the action of the Vienna rectifier.
Generally, a certain time is required for collecting relevant parameters of the Vienna rectifier, and a certain time is also required for controlling the Vienna rectifier to perform relevant actions. Through a previous experiment, the relation between the acquisition delay and the interval length of the control delay and the zero-crossing interval under different powers can be set, and a data table form is formed. The interval length of the zero-crossing interval of the Vienna rectifier under different powers is determined through table lookup to ensure the compensation effect of the modulation voltage waveform of the target phase, so that the distortion rate of the input current of the target phase at the zero-crossing point is restrained, and the working performance of the whole Vienna rectifier is improved.
Secondly, when the current output power is smaller than or equal to a first preset power value, determining the interval length as a first length;
when the current output power is greater than a first preset power value and less than or equal to a second preset power value, determining the interval length as a second length;
when the current output power is larger than a second preset power value, determining the interval length as a third length;
the first preset power value is smaller than or equal to the second preset power value; the second length is a decreasing function of the current output power, the upper limit of the value range of the second length is the first length, and the lower limit is the third length.
The formula for selecting the interval length according to the current output power is as follows:
wherein D is the interval length, and P is the current output power. Namely:
when the current output power P of the Vienna rectifier is less than or equal to 10kw, the interval length D is 0.1;
when the current output power P of the Vienna rectifier is between 10kw and 20kw, the interval length D is linearly reduced from 0.1 to 0;
when the current output power P of the Vienna rectifier is more than or equal to 20kw, the interval length D is 0.
For example, for a target phase, assuming the zero crossing point of the phase is 0, π, then: when the current output power is 10kw, the zero-crossing interval of the target phase includes [ -0.05, 0.05] and [ pi-0.05, pi +0.05], and in the above two intervals, the voltage compensation is performed on the modulation voltage waveform of the target phase.
According to the invention, the Modulation voltage waveform of the target phase is compensated in a targeted manner in the zero-crossing interval, the compensated Modulation voltage waveform is demodulated to obtain a corresponding compensated PWM (Pulse Width Modulation) wave, and the corresponding switching tube is controlled according to the PWM wave, so that the current zero-crossing distortion of the Vienna rectifier can be inhibited, and the ripple wave can be effectively reduced. And the appropriate zero-crossing interval length is determined through the output power, the zero-crossing interval is dynamically adjusted, the compatibility is high, and the working efficiency of the Vienna rectifier can be improved.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
The following are embodiments of the apparatus of the invention, reference being made to the corresponding method embodiments described above for details which are not described in detail therein.
Fig. 9 is a schematic structural diagram of a current distortion suppression device according to an embodiment of the present invention, and for convenience of description, only the parts related to the embodiment of the present invention are shown, and detailed descriptions are as follows:
as shown in fig. 9, a current distortion suppressing apparatus 20 is applied to a Vienna rectifier, and the apparatus 20 may include:
a first monitoring module 201, configured to monitor a modulation voltage waveform of a target phase of the Vienna rectifier; the target phase is any one of three phases of the Vienna rectifier, and the modulation voltage waveform is used for controlling the input current of the target phase;
the control module 202 is configured to perform voltage compensation on the modulation voltage waveform of the target phase in the zero-crossing interval, so that the input current phase corresponding to the compensated zero-crossing interval is reduced compared with that before compensation; the zero-crossing interval is centered on a zero-crossing point of the standard modulation voltage waveform of the target phase.
In some embodiments of the invention, the modulation voltage waveform of the target phase comprises a positive modulation waveform greater than zero and a negative modulation waveform less than zero; the control module 202 may include:
the first compensation unit is used for increasing a first preset voltage value to the voltage of the positive modulation waveform in the zero-crossing interval;
the second compensation unit is used for subtracting a second preset voltage value from the voltage of the negative modulation waveform in the zero-crossing interval; the first preset voltage value and the second preset voltage value are both positive values, the input current of the target phase is reduced along with the increase of the first preset voltage value in the zero-crossing interval, and the input current of the target phase is reduced along with the increase of the second preset voltage value in the zero-crossing interval.
In some embodiments of the present invention, the first predetermined voltage value and the second predetermined voltage value are equal.
In some embodiments of the invention, the target phase comprises a Vienna rectifier first phase, a second phase, and a third phase;
the first compensation unit is specifically used for increasing a first preset voltage value to the voltage of the positive modulation waveform of the first phase in the zero-crossing interval; increasing a first preset voltage value to the voltage of the positive modulation waveform of the second phase in the zero-crossing interval; increasing a first preset voltage value to the voltage of the positive modulation waveform of the third phase in the zero-crossing interval;
the second compensation unit is specifically used for subtracting a second preset voltage value from the voltage of the positive modulation waveform of the first phase in the zero-crossing interval; subtracting a second preset voltage value from the voltage of the positive modulation waveform of the second phase in the zero-crossing interval; subtracting a second preset voltage value from the voltage of the positive modulation waveform of the third phase in the zero-crossing interval;
and the control unit is used for controlling the switching tube corresponding to the target according to the compensated modulation voltage waveform of the target phase after voltage compensation is carried out on the modulation voltage waveform of the target phase in the zero-crossing interval.
In some embodiments of the present invention, the apparatus 20 may further comprise:
the second monitoring module is used for monitoring the current output power of the Vienna rectifier;
the selection module is used for determining the interval length of the zero-crossing interval according to the current output power;
and the interval determining module is used for determining the zero-crossing interval according to the interval length and the zero-crossing point of the standard voltage waveform of the target phase.
The selection module may include:
the first selection unit is used for determining the interval length of the zero-crossing interval according to the acquisition delay and the control delay under the current output power; the acquisition delay is the delay for acquiring the parameters of the Vienna rectifier, and the control delay is the delay for controlling the action of the Vienna rectifier.
The selection module may include:
the second selection unit is used for determining the interval length as the first length when the current output power is smaller than or equal to the first preset power value;
the third selection unit is used for determining the interval length as a second length when the current output power is greater than the first preset power value and is less than or equal to a second preset power value;
the fourth selection unit is used for determining the interval length as a third length when the current output power is greater than a second preset power value; the first preset power value is smaller than or equal to the second preset power value; the second length is a decreasing function of the current output power, the upper limit of the value range of the second length is the first length, and the lower limit is the third length.
Fig. 10 is a schematic diagram of a controller provided in an embodiment of the invention. As shown in fig. 10, the controller 30 of this embodiment includes: a processor 300 and a memory 301, the memory 301 having stored therein a computer program 302 executable on the processor 300. The steps in the various current distortion suppression method embodiments described above, such as S101 to S102 shown in fig. 4, are implemented when the processor 300 executes the computer program 302. Alternatively, the processor 300, when executing the computer program 302, implements the functions of the modules/units in the above-described device embodiments, such as the modules/units 201 to 202 shown in fig. 9.
Illustratively, the computer program 302 may be partitioned into one or more modules/units, which are stored in the memory 301 and executed by the processor 300 to implement the present invention. One or more of the modules/units may be a series of computer program instruction segments capable of performing specific functions that describe the execution of the computer program 302 in the controller 30. For example, the computer program 302 may be divided into the modules/units 201 to 202 shown in fig. 9.
The controller 30 may be a DSP or a single chip module. The controller 30 may include, but is not limited to, a processor 300, a memory 301. Those skilled in the art will appreciate that fig. 10 is merely an example of a controller 30 and does not constitute a limitation on the controller 30, and may include more or fewer components than shown, or combine certain components, or different components, e.g., the controller may also include input-output devices, network access devices, buses, etc.
The Processor 300 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage 301 may be an internal storage unit of the controller 30, such as a hard disk or a memory of the controller 30. The memory 301 may also be an external storage device of the controller 30, such as a plug-in hard disk provided on the controller 30, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like. Further, the memory 301 may also include both an internal storage unit of the controller 30 and an external storage device. The memory 301 is used to store computer programs and other programs and data required by the controller. The memory 301 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules, so as to perform all or part of the functions described above. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The embodiment of the invention also provides a rectification system, which comprises the controller 30 and the Vienna rectifier; the Vienna rectifier is controlled by a controller 30.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided by the present invention, it should be understood that the disclosed apparatus/controller and method may be implemented in other ways. For example, the above-described apparatus/controller embodiments are merely illustrative, and for example, a module or a unit may be divided into only one logical function, and may be implemented in other ways, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not implemented. 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.
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 may be implemented in the form of hardware, or may also be implemented in the form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method according to the above embodiments may be implemented by a computer program, which is stored in a computer readable storage medium and used for instructing related hardware to implement the steps of the current distortion suppressing method embodiments. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may include any suitable increase or decrease as required by legislation and patent practice in the jurisdiction, for example, in some jurisdictions, computer readable media may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; 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; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A current distortion suppression method is applied to a Vienna rectifier, and comprises the following steps:
monitoring a modulation voltage waveform of a target phase of the Vienna rectifier; the target phase is any one of the three phases of the Vienna rectifier, and the modulation voltage waveform is used for controlling the input current of the target phase;
performing voltage compensation on the modulation voltage waveform of the target phase in the zero-crossing interval so that the input current phase corresponding to the compensated zero-crossing interval is reduced compared with that before compensation; wherein the zero-crossing interval is centered around a zero-crossing of the standard modulation voltage waveform of the target phase.
2. The current distortion suppression method according to claim 1, wherein the modulation voltage waveform of the target phase includes a positive modulation waveform larger than zero and a negative modulation waveform smaller than zero;
the voltage compensation of the modulation voltage waveform of the target phase in the zero-crossing interval includes:
increasing a first preset voltage value to the voltage of the positive modulation waveform in the zero-crossing interval;
subtracting a second preset voltage value from the voltage of the negative modulation waveform in the zero-crossing interval;
the first preset voltage value and the second preset voltage value are both positive values, the input current of the target phase is reduced along with the increase of the first preset voltage value in the zero-crossing interval, and the input current of the target phase is reduced along with the increase of the second preset voltage value in the zero-crossing interval.
3. The current distortion suppression method according to claim 2, wherein the first preset voltage value and the second preset voltage value are equal.
4. The current distortion suppression method of claim 2, wherein the target phases comprise the Vienna rectifier first phase, second phase, and third phase;
the increasing of the voltage of the positive modulation waveform within the zero-crossing interval by a first preset voltage value includes:
increasing a first preset voltage value to the voltage of the positive modulation waveform of the first phase within the zero-crossing interval; increasing a first preset voltage value to the voltage of the positive modulation waveform of the second phase in the zero-crossing interval; increasing a first preset voltage value to the voltage of the positive modulation waveform of the third phase within the zero-crossing interval;
subtracting a second preset voltage value from the voltage of the negative modulation waveform in the zero-crossing interval, wherein the method comprises the following steps:
subtracting a second preset voltage value from the voltage of the positive modulation waveform of the first phase within the zero-crossing interval; subtracting a second preset voltage value from the voltage of the positive modulation waveform of the second phase in the zero-crossing interval; subtracting a second preset voltage value from the voltage of the positive modulation waveform of the third phase in the zero-crossing interval;
and after voltage compensation is carried out on the modulation voltage waveform of the target phase within the zero-crossing interval, the switching tube corresponding to the target is controlled according to the compensated modulation voltage waveform of the target phase.
5. The current distortion suppression method according to any one of claims 1 to 4, characterized by further comprising:
monitoring the current output power of the Vienna rectifier;
determining the interval length of the zero-crossing interval according to the current output power;
and determining the zero-crossing interval according to the interval length and the zero-crossing point of the standard voltage waveform of the target phase.
6. The method according to claim 5, wherein the determining the interval length of the zero-crossing interval according to the current output power comprises:
under the current output power, determining the interval length of the zero-crossing interval according to the acquisition delay and the control delay; the acquisition delay is the delay of acquiring the parameters of the Vienna rectifier, and the control delay is the delay of controlling the action of the Vienna rectifier.
7. The method according to claim 5, wherein the determining the interval length of the zero-crossing interval according to the current output power comprises:
when the current output power is smaller than or equal to a first preset power value, determining the interval length as a first length;
when the current output power is larger than the first preset power value and is smaller than or equal to a second preset power value, determining the interval length as a second length;
when the current output power is larger than the second preset power value, determining the interval length as a third length;
wherein the first preset power value is less than or equal to the second preset power value; the second length is a decreasing function of the current output power, the upper limit of the value range of the second length is the first length, and the lower limit of the value range of the second length is the third length.
8. A controller comprising a memory and a processor, the memory having stored therein a computer program operable on the processor, wherein the processor when executing the computer program implements the steps of the current distortion suppression method as claimed in any one of claims 1 to 7 above.
9. A commutation system, comprising the controller of claim 8 and a Vienna rectifier; the Vienna rectifier is controlled by the controller.
10. A computer-readable storage medium, in which a computer program is stored, which, when being executed by a processor, carries out the steps of the current distortion suppression method as set forth in any one of claims 1 to 7 above.
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| CN117526389A (en) * | 2024-01-08 | 2024-02-06 | 法罗电力(浙江)有限公司 | Output power adjusting method of energy storage inverter and computer equipment |
| CN117526389B (en) * | 2024-01-08 | 2024-03-22 | 法罗电力(浙江)有限公司 | Output power adjusting method of energy storage inverter and computer equipment |
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