CN112311364A - SPMW control method for single-phase low-current harmonic wave - Google Patents
SPMW control method for single-phase low-current harmonic wave Download PDFInfo
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K7/00—Modulating pulses with a continuously-variable modulating signal
- H03K7/08—Duration or width modulation ; Duty cycle modulation
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K4/00—Generating pulses having essentially a finite slope or stepped portions
- H03K4/92—Generating pulses having essentially a finite slope or stepped portions having a waveform comprising a portion of a sinusoid
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Abstract
The invention provides a control method for reducing current harmonic waves by single-phase given SPWM. The invention determines the high and low levels of the load output current waveform as the pulse driving signal through the definition of the hysteresis comparator after the comparison of the load output current waveform and the given sine wave through the sine wave form of the given path. The output waveform of the load current is basically consistent with the preset signal of the given SPWM, only a small part of harmonic waves caused by a hysteresis signal in the operation process exist, the harmonic waves are obviously improved compared with a large number of harmonic waves caused by the switching device in a high-frequency switching state in the traditional SPWM, and the harmonic wave content is greatly reduced. In addition, because the selection of the hysteresis parameter can control the harmonic wave to a certain degree in the control process, the controllability of the circuit can be facilitated.
Description
Technical Field
The invention relates to the field of power electronics and power transmission, in particular to an SPMW control method of single-phase low-current harmonic waves.
Background
In general, when a sinusoidal voltage is applied to the linear passive element resistor, inductor and capacitor, the current and voltage are in proportional, integral and differential relations, respectively, and the output is still a sinusoidal wave of the same frequency. However, if a sinusoidal voltage is applied to a nonlinear circuit load, the current becomes a non-sinusoidal wave due to the phase angle problem of the load, and the non-sinusoidal wave current causes a voltage drop in the grid impedance operation, with the result that the voltage waveform also becomes a non-sinusoidal wave.
Disclosure of Invention
The present invention aims to solve the above problems and provide a method for controlling SPMW with single-phase low current harmonics.
The invention realizes the purpose through the following technical scheme:
the technical scheme adopted by the invention is as follows: a single-phase low-voltage harmonic SPMW control method is characterized by comprising the following steps: a sine wave form through a given path; after the comparison between the load output current waveform and a given sine wave, determining the high and low levels of the load output current waveform as a pulse driving signal through the definition of a hysteresis comparator; the output waveform of the load current is basically consistent with the preset signal of the given SPWM, and only a small part of harmonic waves caused by a hysteresis signal in the operation process exist.
Furthermore, the sine wave of a given path needs to be calculated by a coefficient to obtain an accurate value, so that the harmonic content of the sine wave is reduced.
Further, the current waveform of the current passing through the given track is compared with the actual feedback current, and is connected with the hysteresis loop through high-resolution carrier recognition.
Further, the output waveform signal of the current has a certain content of residual harmonic waves due to the influence of hysteresis, which is related to the scanning accuracy of the system.
The invention provides a control method for reducing current harmonic waves by single-phase given SPWM (sinusoidal pulse width modulation), which determines the high and low levels of a load output current waveform as a pulse driving signal through the sine wave form of a given path and the definition of a hysteresis comparator after the comparison of the load output current waveform and the given sine wave. The output waveform of the load current is basically consistent with the preset signal of the given SPWM, only a small part of harmonic waves caused by a hysteresis signal in the operation process exist, the harmonic waves are obviously improved compared with a large number of harmonic waves caused by the switching device in a high-frequency switching state in the traditional SPWM, and the harmonic wave content is greatly reduced.
Drawings
FIG. 1 is a schematic diagram of a given hysteresis loop and equivalent waveforms;
FIG. 2 is a schematic diagram of the current loop control of the single-phase inverter circuit;
FIG. 3 is a block diagram of a low current harmonic SPWM control method implementation;
FIG. 4 is a schematic diagram of a low current harmonic simulation control module;
FIG. 5 is a diagram of a low current harmonic circuit simulation architecture;
FIG. 6 is a waveform diagram of the load output;
FIG. 7 is a load voltage waveform and its harmonic spectrum analysis;
fig. 8 is a comparison of waveforms and pulses before and after processing by a current hysteresis comparator.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The high and low levels during a given pulse are defined as:
the current tracking hysteresis parameter is set as follows:
in the formula, the value size of the delta i is determined according to the load condition, and the smaller the delta i is, the lower the harmonic content of the load is.
In general, when a sinusoidal voltage is applied to the linear passive element resistor, inductor and capacitor, the current and voltage are in proportional, integral and differential relations, respectively, and the output is still a sinusoidal wave of the same frequency. However, if a sinusoidal voltage is applied to a nonlinear circuit load, the current becomes a non-sinusoidal wave due to the phase angle problem of the load, and the non-sinusoidal wave current causes a voltage drop in the grid impedance operation, with the result that the voltage waveform also becomes a non-sinusoidal wave. In mathematical theory, for a non-sinusoidal voltage u (wt) with a period T2 pi/w, which generally satisfies the dirichlet condition, the fourier series equation can be obtained by decomposition:
in the formula:
or:
in the formula: c. Cn、
And an、bnIn a relationship of
In the fourier series in the expressions (3) and (4), a component having the same frequency as the power frequency is referred to as a Fundamental wave (Fundamental), a component having a frequency which is an integral multiple (greater than 1) of the Fundamental frequency is referred to as a harmonic, and the harmonic order is an integral ratio of the harmonic frequency and the Fundamental frequency.
Defining HRIn (harmonic ratio) for the nth harmonic current content rate to represent:
in the formula: in is the effective value of the nth harmonic current; i1 is the effective value of the fundamental current.
The total current Harmonic distortion rate thdi (total Harmonic distortion) is defined as:
the SPWM control technique has an important role to the voltage regulation of power electronics, and traditional SPWM control technique is mainly controlled pulse signal, adopts high frequency control mode modulation, and is not strong to the output harmonic suppression effect of load to if the too big load end that needs to the system of harmonic content carries out filtering, the circuit is comparatively complicated. The invention fits the SPWM technology waveform at the output end, and can accurately control the waveform of the output current by selecting the preset waveform and controlling the waveform interval of the hysteresis controller.
The implementation parameters of the SPWM control method adopting low-current harmonic waves are shown in Table 1:
TABLE 1 SPWM control method variables and parameter values
The foregoing is considered as illustrative of the preferred embodiments of the invention and is not to be construed as limiting the invention in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (4)
1. A single-phase low-current harmonic SPMW control method is characterized by comprising the following steps: a sine wave form through a given path; after the comparison between the load output current waveform and a given sine wave, determining the high and low levels of the load output current waveform as a pulse driving signal through the definition of a hysteresis comparator; the output waveform of the load current is basically consistent with the preset signal of the given SPWM, and only a small part of harmonic waves caused by a hysteresis signal in the operation process exist.
2. SPWM control of low current harmonics according to claim 1, characterized by: the sine wave of a given path needs to be calculated by a coefficient to obtain an accurate value, so that the harmonic content of the sine wave is reduced.
3. SPWM control of low current harmonics according to claim 1, characterized by: the current waveform of the current passing through the given track is compared with the actual feedback current, and is connected with the hysteresis loop through high-resolution carrier recognition.
4. The SPWM control of low voltage harmonics as recited in claim 1, wherein the output waveform signal of the current has a certain content of residual harmonics due to hysteresis, which is related to the scanning accuracy of the system.
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| CN201910705422.1A CN112311364A (en) | 2019-08-01 | 2019-08-01 | SPMW control method for single-phase low-current harmonic wave |
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| CN201910705422.1A CN112311364A (en) | 2019-08-01 | 2019-08-01 | SPMW control method for single-phase low-current harmonic wave |
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Citations (6)
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|---|---|---|---|---|
| US20030142519A1 (en) * | 2002-01-29 | 2003-07-31 | Intersil Americas Inc. | Synthetic ripple regulator |
| CN102130624A (en) * | 2011-04-28 | 2011-07-20 | 江西中能电气科技有限公司 | Hysteresis loop and carrier hybrid modulation method for voltage inverter |
| CN102684192A (en) * | 2011-03-16 | 2012-09-19 | 如皋市图腾电力科技有限公司 | Current control method for active power filter |
| CN103280808A (en) * | 2013-06-08 | 2013-09-04 | 南京因泰莱电器股份有限公司 | Variable ring width hysteresis current control method based on timer |
| CN105656309A (en) * | 2016-03-14 | 2016-06-08 | 广东明阳龙源电力电子有限公司 | Hardware hysteresis current control method used for wind power converter |
| CN109983683A (en) * | 2016-11-24 | 2019-07-05 | 西门子股份公司 | Adjusting to the output electric current of current transformer |
-
2019
- 2019-08-01 CN CN201910705422.1A patent/CN112311364A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030142519A1 (en) * | 2002-01-29 | 2003-07-31 | Intersil Americas Inc. | Synthetic ripple regulator |
| CN102684192A (en) * | 2011-03-16 | 2012-09-19 | 如皋市图腾电力科技有限公司 | Current control method for active power filter |
| CN102130624A (en) * | 2011-04-28 | 2011-07-20 | 江西中能电气科技有限公司 | Hysteresis loop and carrier hybrid modulation method for voltage inverter |
| CN103280808A (en) * | 2013-06-08 | 2013-09-04 | 南京因泰莱电器股份有限公司 | Variable ring width hysteresis current control method based on timer |
| CN105656309A (en) * | 2016-03-14 | 2016-06-08 | 广东明阳龙源电力电子有限公司 | Hardware hysteresis current control method used for wind power converter |
| CN109983683A (en) * | 2016-11-24 | 2019-07-05 | 西门子股份公司 | Adjusting to the output electric current of current transformer |
Non-Patent Citations (2)
| Title |
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| 李超: "一种可实现谐波抑制的并网逆变器设计", pages 042 - 56 * |
| 杨卫国等: "《电力电子技术》", 冶金工业出版社, pages: 194 - 195 * |
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