CN110365241A - A kind of high-precision quasi-sine-wave signal generating method - Google Patents
A kind of high-precision quasi-sine-wave signal generating method Download PDFInfo
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- CN110365241A CN110365241A CN201910736663.2A CN201910736663A CN110365241A CN 110365241 A CN110365241 A CN 110365241A CN 201910736663 A CN201910736663 A CN 201910736663A CN 110365241 A CN110365241 A CN 110365241A
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- parallel operation
- wave signal
- sine
- bridging parallel
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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
- H02M7/42—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
- H02M7/501—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 sinusoidal output voltages being obtained by the combination of several pulse-voltages having different amplitude and width
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Abstract
The present invention provides a kind of high-precision quasi-sine-wave signal generating methods, comprising the following steps: S1: building is by the n cascade sine wave signal fitting circuit of H bridging parallel operation；S2: selection H bridging parallel operation DC voltage Vdc, and according to sine wave signal voltage fundamental component V to be fitted1mDetermine modulation ratio m；S3: the initial value of the switching angle of each H bridging parallel operation is determined according to the relationship of m and n；S4: the control angle of switching tube in each H bridging parallel operation is determined according to the initial value of the switching angle of each H bridging parallel operation.Its effect is: being set using initial value of this method to switching angle, iteration convergence effect is good, speed is fast, and it is adapted to wider array of scope of design, it avoids under the value condition of part m and n, initial value seeks the problem of without solution, while can produce the high-precision quasi-sine-wave signal that can eliminate particular harmonic, promotion signal quality.
Description
Technical field
The present invention relates to electronic information technologies, and in particular to a kind of high-precision sine wave signal generating method.
Background technique
High-precision quasi-sine-wave signal source is often referred in instrument and meter testing field, as shown in Figure 1, leading in the prior art
It is cascaded frequently with multiple H bridges, is fitted sine wave with staircase waveform, by selecting specific switching time, to generate corresponding grade
Staircase waveform, to realize the output of sine wave signal.
But its existing technological deficiency is:
It is not accurate enough to the initial value setting at each H bridge switch angle, cause harmonic wave in the signal waveform generated more, influences
Signal quality.
Summary of the invention
Based on drawbacks described above, the present invention proposes a kind of high-precision quasi-sine-wave signal generating method, and this method is to cascade H bridge
In the initial value of each switch constrained, standardize its design process more, the signal of generation can be realized the elimination of harmonic wave,
Promotion signal quality.
To achieve the above object, specific technical solution of the present invention is as follows:
A kind of high-precision quasi-sine-wave signal generating method, key are to include the next steps:
S1: building is by the n cascade sine wave signal fitting circuit of H bridging parallel operation；
S2: selection H bridging parallel operation DC voltage Vdc, and according to sine wave signal voltage fundamental component V to be fitted1m
Determine modulation ratio m；
S3: the initial value of the switching angle of each H bridging parallel operation is determined according to the relationship of m and n；
S4: switching tube in each H bridging parallel operation is determined according to the initial value progressive alternate of the switching angle of each H bridging parallel operation
Control angle.
Optionally, in step S3, sine wave signal voltage fundamental component V is taken1m=1, Rule of judgmentWhether at
It is vertical, it is invalid in this way, then according to:
Calculate the initial value of the switching angle of each H bridging parallel operation；
If set up, according to:
Calculate the initial value of the switching angle of each H bridging parallel operation, wherein odd number of the i between 3≤i≤n-3.
Optionally, it after the initial value for determining each switching angle, is solved using the fsolve function based on least square each
The control angle of switching tube in a H bridging parallel operation.
Optionally, the cascade number n of H bridging parallel operation is the odd number more than or equal to 3.
Beneficial effects of the present invention:
It is set using initial value of this method to switching angle, iteration convergence effect is good, and speed is fast, and is adapted to more
The problem of wide scope of design avoids under the value condition of part m and n, and initial value is sought without solution, while can produce and can disappear
Except the high-precision quasi-sine-wave signal of particular harmonic, promotion signal quality.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described.
Fig. 1 is the circuit topological structure figure of the specific embodiment of the invention；
Fig. 2 is the step-like voltage waveform of the invention obtained based on H bridging parallel operation cascade Overlapping Harmonic-Elimination；
Fig. 3 is the value condition of each switching angle initial value under modulation ratio different situations；
Fig. 4 is the schematic diagram that Fig. 3 limit on the left amplifies situation；
Fig. 5 is the cascade signal THD comparison diagram of different number H bridging parallel operation in specific embodiment.
Specific embodiment
It is described in detail below in conjunction with embodiment of the attached drawing to technical solution of the present invention.Following embodiment is only used for
Clearly illustrate technical solution of the present invention, therefore be only used as example, and cannot be used as a limitation and limit protection model of the invention
It encloses.
It should be noted that unless otherwise indicated, technical term or scientific term used in this application should be this hair
The ordinary meaning that bright one of ordinary skill in the art are understood.
The present embodiment provides a kind of high-precision quasi-sine-wave signal generating methods, include the next steps:
S1: building is by the n cascade sine wave signal fitting circuit of H bridging parallel operation；N is the odd number more than or equal to 3, circuit
Connection relationship is as shown in Figure 1；
S2: selection H bridging parallel operation DC voltage Vdc, and according to sine wave signal voltage fundamental component V to be fitted1m
Determine modulation ratio m；
S3: the initial value of the switching angle of each H bridging parallel operation is determined according to the relationship of m and n；
When it is implemented, taking sine wave signal voltage fundamental component V1m=1, Rule of judgmentIt is whether true, such as
Be it is invalid, then according to:
Calculate the initial value of the switching angle of each H bridging parallel operation；
If set up, according to:
Calculate the initial value of the switching angle of each H bridging parallel operation, wherein odd number of the i between 3≤i≤n-3
S4: switching tube in each H bridging parallel operation is determined according to the initial value progressive alternate of the switching angle of each H bridging parallel operation
Control angle.
When it is implemented, being asked after the initial value for determining each switching angle using the fsolve function based on least square
Solve the control angle of switching tube in each H bridging parallel operation.
Pass through the above method, it can be deduced that the step-like voltage waveform after Overlapping Harmonic-Elimination as shown in Figure 2, to fit
The sine wave signal needed.
Main thought of the invention is exactly to pass through initial value design staircase waveform is made to be fitted sine wave as far as possible, according to the tune of design
Section, it may be predetermined that n and m intends the turnover upper edge point and sine curve of staircase waveform in the case where n and m is known situation
It closes, initial switching angle, this design is determined with antitrigonometric function according to the ordinate of the ladder inflection point on sine curve
The switching angle initial value that method determines is relatively accurate；But it for the m range that cannot negate triangle, then is difficult to be applicable in.The present invention
By empirical data, one initial value is sequentially allocated according to the increment of very little to it, is then obtained by way of progressive alternate
Final switching angle.Finally when specific iteration solves equation, iteratively solved using fsolve function in matlab.
For a further understanding of effect of the invention, the simplest cascade in n=3 can be seen that by Fig. 3 and Fig. 4
In system, each switching angle to be made to have solution, the value range of m should be 0.35≤m≤1.07.If because of DC side electricity
Press VdcWith sine wave signal voltage fundamental component V1mInfluence lead to modulation ratio formula m=V1m/(nVdc) it is not belonging to above range,
It will then be difficult to obtain each switching angle accurately initial value by way of direct solution.It designs through the invention, no matter in m value
In which kind of situation, the initial value of each switching angle of the determination that can standardize, it is convenient to bring to the design of circuit, and it is produced
Raw signal harmonic eradicating efficacy is also more preferable.
In the case where also analyzing different cascade numbers in the present embodiment, the THD value of its signal when different m values, such as 1 He of table
Shown in Fig. 5, it can be seen that, it is known that as n increases, THD can be gradually decreased, it is seen that the waveform matter of output voltage when module increases
Amount is higher, and harmonic elimination effect is better.For identical n, THD changes as m changes, but designs by this method, and THD only exists
It is fluctuated in the range of very little.
Difference m value corresponds to THD result when table 1 n=3, n=5, n=15
By above description it is appreciated that a kind of high-precision quasi-sine-wave signal generating method provided by the invention, main root
The initial value what mode to calculate the switching angle of each H bridging parallel operation with is determined according to the relationship of m and n, answers it in different
With the accurate determination that under scene, can realize the initial value of switching angle, reach the function of superposition harmonic carcellation, issues it just
String wave signal is more accurate.
In addition, the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；Although referring to aforementioned
Invention is explained in detail for each embodiment, those skilled in the art should understand that: it still can be to preceding
It states technical solution documented by each embodiment to modify, or some or all of the technical features is equally replaced
It changes；And these are modified or replaceed, the model for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution
It encloses, should all cover within the scope of the claims and the description of the invention.
Claims (4)
1. a kind of high-precision quasi-sine-wave signal generating method, it is characterised in that include the next steps:
S1: building is by the n cascade sine wave signal fitting circuit of H bridging parallel operation；
S2: selection H bridging parallel operation DC voltage Vdc, and according to sine wave signal voltage fundamental component V to be fitted1mIt determines and adjusts
System compares m；
S3: the initial value of the switching angle of each H bridging parallel operation is determined according to the relationship of m and n；
S4: the control of switching tube in each H bridging parallel operation is determined according to the initial value progressive alternate of the switching angle of each H bridging parallel operation
Angle processed.
2. high-precision quasi-sine-wave signal generating method according to claim 1, it is characterised in that:
In step S3, sine wave signal voltage fundamental component V is taken1m=1, Rule of judgmentIt is whether true, in this way not at
It is vertical, then according to:
K=1~n calculates the initial value of the switching angle of each H bridging parallel operation；
If set up, according to:
Calculate the initial value of the switching angle of each H bridging parallel operation, wherein odd number of the i between 3≤i≤n-3.
3. high-precision quasi-sine-wave signal generating method according to claim 1, it is characterised in that: determining each switching angle
Initial value after, the control angle of switching tube in each H bridging parallel operation is solved using the fsolve function based on least square.
4. high-precision quasi-sine-wave signal generating method according to claim 1, it is characterised in that: H bridging parallel operation is cascade
Number n is the odd number more than or equal to 3.
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| EP1560312A2 (en) * | 2004-01-27 | 2005-08-03 | ABB Oy | Method and arrangement in connection with network inverter |
| CN101409518A (en) * | 2008-11-12 | 2009-04-15 | 国电南京自动化股份有限公司 | Method for implementing bi-level specific resonance-eliminating pulse-width modulation base on IGCT |
| CN101777890A (en) * | 2009-12-23 | 2010-07-14 | 中国航天科技集团公司第五研究院第五一四研究所 | System and method for reducing harmonic noise of digital-synthesis sine waves |
| CN103457501A (en) * | 2013-08-23 | 2013-12-18 | 上海交通大学 | SVG modulating method based on PAM+PWM cascading multi-level inverter |
| CN103825529A (en) * | 2014-02-27 | 2014-05-28 | 株洲南车时代电气股份有限公司 | High-dynamic-response pulse width modulation method at low switching frequency |
-
2019
- 2019-08-09 CN CN201910736663.2A patent/CN110365241B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1560312A2 (en) * | 2004-01-27 | 2005-08-03 | ABB Oy | Method and arrangement in connection with network inverter |
| CN101409518A (en) * | 2008-11-12 | 2009-04-15 | 国电南京自动化股份有限公司 | Method for implementing bi-level specific resonance-eliminating pulse-width modulation base on IGCT |
| CN101777890A (en) * | 2009-12-23 | 2010-07-14 | 中国航天科技集团公司第五研究院第五一四研究所 | System and method for reducing harmonic noise of digital-synthesis sine waves |
| CN103457501A (en) * | 2013-08-23 | 2013-12-18 | 上海交通大学 | SVG modulating method based on PAM+PWM cascading multi-level inverter |
| CN103825529A (en) * | 2014-02-27 | 2014-05-28 | 株洲南车时代电气股份有限公司 | High-dynamic-response pulse width modulation method at low switching frequency |
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| 佟为明: ""PWM逆变器特定消谐式谐波抑制技术的研究"", 《中国博士学位论文全文数据库 工程科技 II辑》 * |
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